期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到99篇文章
< 1 2 … 5 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Impact of Short-Term Power Shortage from Low Voltage Ride through and DC Commutation Failure on Power Grid Frequency Stability 认领 引用 被引量：1
1
作者 Wenjia Zhang Sixuan Xu +2 位作者 Wanchun Qi Zhuyi Peng Wentao Sun 《Energy Engineering》 EI 2025年第6期2371-2387,共17页
Countries worldwide are advocating for energy transition initiatives to promote the construction of low-carbon energy systems.The low voltage ride through(LVRT)characteristics of renewable energy units and commutation... Countries worldwide are advocating for energy transition initiatives to promote the construction of low-carbon energy systems.The low voltage ride through(LVRT)characteristics of renewable energy units and commutation failures in line commutated converter high voltage direct current(LCC-HVDC)systems at the receiving end leads to short-term power shortage(STPS),which differs from traditional frequency stability issues.STPS occurs during the generator’s power angle swing phase,before the governor responds,and is on a timescale that is not related to primary frequency regulation.This paper addresses these challenges by examining the impact of LVRT on voltage stability,developing a frequency response model to analyze the mechanism of frequency instability caused by STPS,deriving the impact of STPS on the maximum frequency deviation,and introducing an energy deficiency factor to assess its impact on regional frequency stability.The East China Power Grid is used as a case study,where the energy deficiency factor is calculated to validate the proposed mechanism.STPS is mainly compensated by the rotor kinetic energy of the generators in this region,with minimal impact on other regions.It is concluded that the energy deficiency factor provides an effective explanation for the spatial distribution of the impact of STPS on system frequency. 展开更多
关键词 Commutation failure frequency stability LVRT renewable energy short-term power shortage LCCHVDC
暂未订购 下载PDF
Analysis and Control of Frequency Stability in Low-Inertia Power Systems:A Review 认领 引用 被引量：4
2
作者 Changjun He Hua Geng +1 位作者 Kaushik Rajashekara Ambrish Chandra 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2024年第12期2363-2383,共21页
Power electronic-interfaced renewable energy sources(RES)exhibit lower inertia compared to traditional synchronous generators.The large-scale integration of RES has led to a significant reduction in system inertia,pos... Power electronic-interfaced renewable energy sources(RES)exhibit lower inertia compared to traditional synchronous generators.The large-scale integration of RES has led to a significant reduction in system inertia,posing significant challenges for maintaining frequency stability in future power systems.This issue has garnered considerable attention in recent years.However,the existing research has not yet achieved a comprehensive understanding of system inertia and frequency stability in the context of low-inertia systems.To this end,this paper provides a comprehensive review of the definition,modeling,analysis,evaluation,and control for frequency stability.It commences with an exploration of inertia and frequency characteristics in low-inertia systems,followed by a novel definition of frequency stability.A summary of frequency stability modeling,analysis,and evaluation methods is then provided,along with their respective applicability in various scenarios.Additionally,the two critical factors of frequency control—energy sources at the system level and control strategies at the device level—are examined.Finally,an outlook on future research in low-inertia power systems is discussed. 展开更多
关键词 Frequency control frequency stability definition low inertia power system with high penetration of renewable energy sources
暂未订购 下载PDF
Modelling and Simulation of Performance of the Microgrid Frequency Stability Control during Unplanned Islanding: The Case Study of Mwenga Hydropower 认领 引用
3
作者 Eligard Kyaruzi Francis Arthur M. Omari John P. John 《Smart Grid and Renewable Energy》 2022年第7期160-171,共12页
A grid connected microgrid connects to the grid at a point of common coupling. Due to the great inertia of the grid which accelerates and decelerates the generator when its frequency tends to deviate, the grid connect... A grid connected microgrid connects to the grid at a point of common coupling. Due to the great inertia of the grid which accelerates and decelerates the generator when its frequency tends to deviate, the grid connected microgrid operates at a frequency of the infinity bus. Frequency instability is one of the major challenges facing the grid connected microgrid during islanding. The power demand variation causes the variation in rotor speed, resulting to frequency deviation. Frequency can be brought back to standard by varying the power generation to match with the varying load. The performance of the frequency stability control system at Mwenga hydroelectric microgrid has been studied. Through site visitation, the power demand and generation status data were collected and analysed for model preparation. The results of the study indicate that, during islanding, the Mwenga rural electrification project is observed to be subjected to power imbalance which leads to frequency instability. Although the frequency control system tries to keep the system at a nominal frequency by maintaining the continuous balance between generation and varying load demand, however the system still operates with large magnitude of overshoot, undershoot and longer settling time. 展开更多
关键词 Modelling Frequency Stability Unplanned Islanding Mwenga
暂未订购 下载PDF
Optimal Parameters and Placement of Hybrid Energy Storage Systems for Frequency Stability Improvement 认领 引用 被引量：13
4
作者 Dan Liu Qiufan Yang +2 位作者 Yin Chen Xia Chen Jinyu Wen 《Protection and Control of Modern Power Systems》 SCIE EI CSCD 2025年第2期40-53,共14页
Energy storage with virtual inertia and virtual droop control has attracted wide attention due to its improved frequency stability with high penetration of renewable energy sources.However,there are significant spatia... Energy storage with virtual inertia and virtual droop control has attracted wide attention due to its improved frequency stability with high penetration of renewable energy sources.However,there are significant spatial differences in frequency response.The location and capacity of energy storage are urgent issues to be resolved to support frequency.This study addresses the minimum investment of hybrid energy storage systems for providing sufficient frequency support,including the power capacity,energy capacity,and location of energy storage.A frequency response model is developed taking into account the network structure and frequency spatial distribution characteristics.In addition,a numerical computation method is provided for determining the frequency dynamic indices and calculating the output power of energy storage.Based on a simplified frequency response model,an optimal hybrid energy storage configuration method is proposed to optimize the control parameters,location,and capacity to satisfy the frequency dynamic constraints.This configuration method can exploit the potential of energy storage with different rates in different frequency support stages.To address the nonconvex drawback of this configuration,a numerical calculation method is provided based on the explicit gradient of the frequency and energy storage indices to enhance the computational efficiency.Simulations of a two-area system and the south-east Australian system verify the effectiveness of the proposed hybrid energy storage configuration method. 展开更多
关键词 Hybrid energy storage inertia control droop control optimal configuration frequency stability
Frequency Stability Analysis Based on Generation Flexibility and Domain of Attraction for Power Systems with High Proportion of Renewable Energy Sources 认领 引用
5
作者 Xiaohui Zhang Changhong Deng +3 位作者 Qiang Xu Peng Cao Wei Li Li Feng 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2025年第4期1139-1150,共12页
The significant increase in the proportion of renewable energy sources(RESs)has elevated risks of extreme ramp events and frequency instability in power systems.In recent years,frequency stability events have occurred... The significant increase in the proportion of renewable energy sources(RESs)has elevated risks of extreme ramp events and frequency instability in power systems.In recent years,frequency stability events have occurred in several countriesegions worldwide due to flexibility deficiencies.Generation flexibility has emerged as a critical factor influencing the frequency stability of power systems.This paper proposes a domain of attraction(DOA)-based quantitative method to assess the frequency stability region of power systems with a high proportion of RESs,considering generation flexibility constraints.First,ramp rate is adopted as the core indicator to characterize generation flexibility within automatic generation control(AGC)timescale,through which a nonlinear AGC model with rate saturation constraints is established.Second,the concept of DOA is introduced to define the stability region of the nonlinear AGC.Third,a quadratic Lyapunov-based estimation method is employed to quantitatively analyze the DOA of the nonlinear AGC at different generation flexibility levels.Simulation results demonstrate that increased generation flexibility expands the estimated DOA of the nonlinear AGC,whereas generation flexibility deficiency induces AGC instability.Moreover,state trajectory and time-domain simulation verify that the proposed estimation method accurately represents the stability region of the nonlinear AGC. 展开更多
关键词 Frequency stability renewable energy source(RES) generation flexibility automatic generation control domain of attraction(DOA)
Coordinated Control Strategy for Active Frequency Support in PV-Storage Integrated Systems 认领 引用
6
作者 Junxian Ma Haonan Zhao +3 位作者 Zhibing Hu Yaru Shen Fan Ding Shouqi Jiang 《Energy Engineering》 EI 2026年第2期134-152,共19页
Energy storage-equipped photovoltaic(PV-storage)systems can meet frequency regulation requirements under various operating conditions,and their coordinated support for grid frequency has become a future trend.To addre... Energy storage-equipped photovoltaic(PV-storage)systems can meet frequency regulation requirements under various operating conditions,and their coordinated support for grid frequency has become a future trend.To address frequency stability issues caused by low inertia and weak damping,this paper proposes a multi-timescale frequency regulation coordinated control strategy for PV-storage integrated systems.First,a self-synchronizing control strategy for grid-connected inverters is designed based on DC voltage dynamics,enabling active inertia support while transmitting frequency variation information.Next,an energy storage inertia support control strategy is developed to enhance the frequency nadir,and an active frequency support control strategy for PV system considering a frequency regulation deadband is proposed,where the deadband value is determined based on the power regulation margin of synchronous generators,allowing the PV-storage system to adaptively switch between inertia support and primary frequency regulation under different disturbance conditions.This approach ensures system frequency stability while fully leveraging the regulation capabilities of heterogeneous resources.Finally,the real-time digital simulation results of the PV-storage integrated system demonstrate that,compared to existing control methods,the proposed strategy effectively reduces the rate of change of frequency and improves the frequency nadir under various disturbance scenarios,verifying its effectiveness. 展开更多
关键词 PV-storage integrated systems inertia self-synchronization control primary frequency regulation frequency stability
暂未订购 下载PDF
An ultra-stable MEMS resonator with±14 ppb frequency stability realized by nonlinearitymediated drift suppression 认领 引用
7
作者 Yutao Xu Chun Wang +2 位作者 Junsheng Lv Gang Shao Xueyong Wei 《Microsystems & Nanoengineering》 SCIE EI CSCD 2025年第5期187-197,共11页
Silicon-based MEMS resonators have shown promising potential to replace quartz crystal resonators in many fields,especially in realizing precise timing.However,the large temperature-dependent properties of single-crys... Silicon-based MEMS resonators have shown promising potential to replace quartz crystal resonators in many fields,especially in realizing precise timing.However,the large temperature-dependent properties of single-crystal silicon render the MEMS resonators suffer from severe degradation in frequency stability caused by temperature variation,thus hindering the development of silicon-based resonant devices.Although oven-controlled MEMS resonators have been demonstrated to achieve ppb-level frequency stability,the on-chip oven control scheme requires a redesign of the resonator structures or even a change in the manufacturing process,offering little post-fabrication flexibility and limiting its engineering applications.In this work,a nonlinearity-mediated temperature compensation scheme is proposed with the objective of rapidly and precisely controlling the frequency stability of the MEMS resonator.By employing the nonlinear amplitude-frequency dependence of a Duffing resonator to actively suppress the frequency drift after the first stage oven control,the reported MEMS resonator exhibits a frequency stability of±14 ppb. 展开更多
关键词 temperature compensation quartz crystal resonators frequency stability ultra stable nonlinearity mediated drift suppression mems resonators realizing precise timinghoweverthe
The impact of increased renewable energy penetration and reduced inertia on the frequency nadir in a multi-area interconnected network based on the peninsula Malaysia national grid 认领 引用
8
作者 Ousama M.T.Ajami Maadh S.J.Alkhusaibi +2 位作者 Rodney H.G.Tan Farah Adilah Jamaludin Mithulananthan Nadarajah 《Global Energy Interconnection》 EI CSCD 2026年第2期372-385,共14页
The increased adoption of renewable energy sources(RES)has left the power system grid with ever more decreasing inertia.The inertia plays a crucial part in mitigating frequency changes in the power system.Nevertheless... The increased adoption of renewable energy sources(RES)has left the power system grid with ever more decreasing inertia.The inertia plays a crucial part in mitigating frequency changes in the power system.Nevertheless,the extent how which the reduction of inertia affects an interconnected power system has not been studied,specifically the frequency nadir parameter.In this research,the effects of increasing RES penetration and the consecutive reduction in inertia have been studied,and their impact on the frequency nadir was investigated.A transfer function model of the power system frequency was developed based on the Malaysian peninsula interconnected grid,consisting of four regions.Four scenarios were tested,each of which focused on a specific region with varying levels of load disturbances and RES penetration levels.A performance metric,mFD,was proposed to measure the sensitivity of frequency nadir with different contingency levels at varying RE penetration.The scenarios demonstrated the nonlinear relation between the increase of RE and the frequency nadir.Furthermore,the relation of disturbance magnitude and frequency nadir was determined to be linear.The scenarios demonstrated the role of higher inertia regions in mitigating the effects of contingencies propagating to other regions.Moreover,regions with low inertia and higher interconnections showed more resilience when the contingency occurred outside their area.Conversely,they showed a higher risk for the system when the inertia happens within them.The results show the importance of maintaining inertia in high inertia grids and increasing it in lower inertia grids. 展开更多
关键词 Load frequency control Frequency nadir Power system inertia Frequency stability
暂未订购 下载PDF
Parameter Optimization Strategy for VSC-HVDC Low-Voltage Ride-Through Considering Short-CIRCUIT Current and System Stability 认领 引用
9
作者 Zimin Zhu Yu Duan +3 位作者 Jian Ma Xiaoyun Wang Xiaoyu Deng Xiaofang Wu 《Energy Engineering》 EI 2026年第4期321-340,共20页
When the converter bus voltage of a voltage source converter-based high voltage direct current(VSC-HVDC)system drops below a certain predetermined threshold,the system enters low-voltage ride-through(LVRT)mode to avoi... When the converter bus voltage of a voltage source converter-based high voltage direct current(VSC-HVDC)system drops below a certain predetermined threshold,the system enters low-voltage ride-through(LVRT)mode to avoid overcurrent and potential equipment failure,during which it operates as a controlled current source.The influence mechanism of LVRT control strategies on short-circuit current and overall system stability remains not yet fully and systematically investigated.First,this paper provides an overview of several LVRT strategies for VSC-HVDC systems and examines their effects on short-circuit current contribution.Next,it analyzes in detail the mechanisms through which active and reactive currents injected during LVRT impact system frequency stability,voltage stability,and synchronization stability.To address these interrelated issues,an optimized and comprehensive LVRT strategy incorporating short-circuit current constraints is proposed.The approach determines the active current ratio based on system frequency stability requirements and dynamically adjusts the active current recovery rate via phase control of the VSC-HVDC bus.The remaining capacity is allocated to reactive current support,thereby enhancing voltage and synchronization stability while maintaining sufficient short-circuit current margin and system frequency stability.Finally,simulations conducted on the PSS/E platform,using actual grid data from a selected cross-section system,validate convincingly the effectiveness of the proposed parameter optimization strategy for VSC-HVDC low-voltage ride-through. 展开更多
关键词 Short-circuit current VSC-HVDC systems LVRT voltage stability frequency stability synchronization stability
暂未订购 下载PDF
Simultaneous frequency stabilization of two 1550-nm lasers at single-photon level 认领 引用
10
作者 Bo Yu Zhenqiang Yin +2 位作者 Weijie Ding Hui Yang Weixin Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期453-458,共6页
The twin-field quantum key distribution(TF-QKD)requires that two lasers hundreds of kilometers apart must have the same frequency to achieve the high single-photon interference visibility.This means that both lasers n... The twin-field quantum key distribution(TF-QKD)requires that two lasers hundreds of kilometers apart must have the same frequency to achieve the high single-photon interference visibility.This means that both lasers need to be stabilized to the same frequency reference.A simple and robust system is presented for simultaneously stabilizing two 1550-nm lasers at the single-photon level.By utilizing the single-photon multi-frequency modulation technology,both the fiber laser and distributed feedback(DFB)laser are stabilized to theπ-phase shifted fiber Bragg grating at the same time.The frequency fluctuations of fiber laser and DFB laser are bounded within 1.39 MHz and 1.53 MHz over 2000 s,respectively.These two frequency-stabilized 1550-nm lasers could be used for TF-QKD. 展开更多
关键词 single-photon multi-frequency modulation frequency stabilization π-phase shifted fiber Bragg grating
暂未订购 下载PDF
Frequency measurement and analysis via different frequency phase synchronization fuzzy region 认领 引用
11
作者 DU Baoqiang WANG Xiang YAO Dunzhi 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2026年第2期219-231,共13页
A precise frequency measurement and analysis method utilizing the concept of the different frequency phase synchronization fuzzy region is presented based on the principle of phase synchronization detection.Initially,... A precise frequency measurement and analysis method utilizing the concept of the different frequency phase synchronization fuzzy region is presented based on the principle of phase synchronization detection.Initially,the frequency of the measured signal was roughly estimated by using the traditional high-precision time and frequency detection technology.Subsequently,the frequency estimated was fed into a direct digital synthesizer(DDS)to generate a real-time frequency standard signal that exhibited a slight frequency deviation relative to the measured signal.The edge pulses of the different frequency phase synchronization fuzzy region served as counter switch signals,enabling the counting of both the detected signal and the real-time frequency standard signal within a specified gate time.Through subsequent data processing of the obtained values,the frequency,frequency difference,and frequency accuracy of the detected signal could be determined.Experimental results demonstrate that the system based on this method achieves a frequency stability of 10−13 at 1 s,with a frequency deviation of less than 3 Hz.Compared with traditional frequency measurement and analysis methods,this approach has many advantages,especially its fast response time of less than 1 ms,high measurement accuracy of more than 10−11 at 1 s,high integration with only one FPGA chip,and cost of less than 1000 yuan.It is widely applied in the fields of time and frequency services and security technology of the Beidou satellite(BDS)navigation system,such as BDS pseudo-range measurement,Beidou positioning,navigation and time services,as well as precise time and frequency measurement and control,etc. 展开更多
关键词 different frequency phase synchronization frequency analysis and measurement frequency accuracy phase synchronization fuzzy region frequency stability group period
暂未订购 下载PDF
Ultrastable Nd:YAG 1064-nm lasers with 2.1×10-16frequency stability based on a field-programmable gate array frequency-locked system 认领 引用
12
作者 Zhenqian Li Zongyu Lu +3 位作者 Lingfeng Wan Yuan Ru Lisheng Chen Liufeng Li 《Chinese Optics Letters》 SCIE EI CAS CSCD 2025年第1期67-71,共5页
Ultrastable continuous-wave lasers are one of the important elements for space-based gravitational wave detection.Here we present a Pound–Drever–Hall laser frequency-locked system based on a field-programmable gate ... Ultrastable continuous-wave lasers are one of the important elements for space-based gravitational wave detection.Here we present a Pound–Drever–Hall laser frequency-locked system based on a field-programmable gate array,demonstrating its potential to achieve 10-16levels of frequency stability for space applications.The system is employed to lock a spacequalified 1064-nm neodymium-doped yttrium aluminum garnet laser to a laboratory-operated 20-cm ultrastable optical cavity.Major noise contributors are identified as laser intensity fluctuation and residual amplitude modulation.The heterodyne beat measurement shows that the frequency noise spectral density of a single laser is reduced to 2.5 Hz/√Hz at a Fourier frequency of 1 m Hz,and the frequency instability is 2.1×10-16at 1 s and remains below 3.5×10-16up to 6000 s. 展开更多
关键词 narrow-linewidth laser automatic frequency stabilization gravitational wave detection
暂未订购 下载PDF
Robust external cavity diode laser system with high frequency stability for Cs atomic clock 认领 引用 被引量：11
13
作者 阮军 刘杰 +3 位作者 马杰 杜志静 吴长江 张首刚 《Chinese Optics Letters》 SCIE EI CAS 2010年第3期300-302,共3页
A robust external cavity diode laser （ECDL） insensitive to mechanical vibration is built with an interference filter for selecting wavelength and a cat-eye reflector for light feedback. The free-running laser has a ... A robust external cavity diode laser （ECDL） insensitive to mechanical vibration is built with an interference filter for selecting wavelength and a cat-eye reflector for light feedback. The free-running laser has a linewidth of 72 kHz. The laser frequency stability reaches 3×10^-12 at 1-s integration time in terms of relative Allan variance based on the saturation absorption spectrum. 展开更多
关键词 Absorption spectroscopy Cesium Frequency stability Vibrations (mechanical)
暂未订购 下载PDF
Frequency Stability of Power System with Large Share of Wind Power Under Storm Conditions 认领 引用 被引量：5
14
作者 Kaushik Das Feng Guo +1 位作者 Edgar Nuno Nicolaos A.Cutululis 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2020年第2期219-228,共10页
The operation of transmission systems with large share of wind power is specially challenging under storm conditions.Under the stormy wind speed conditions,wind turbine protection system is designed to shut down the t... The operation of transmission systems with large share of wind power is specially challenging under storm conditions.Under the stormy wind speed conditions,wind turbine protection system is designed to shut down the turbine to avoid excessive mechanical load.The sudden loss of wind power from large offshore plants is difficult to forecast accurately,which results in a large amount of power imbalance.The severity of such a wind power imbalance towards frequency stability needs to be studied for the future power systems.In addition,the overhead transmission lines can also be affected during storms,thereby increasing their probability of failure in the operation of power system under the islanded conditions.This paper investigates how the stormy weather can threaten the frequency stability of future Danish power system with large share of wind power and how to avoid the frequency instability through proper control and defence strategies such as high-voltage direct current(HVDC)control and load shedding.Sensitivity studies are performed for ramp rates of HVDC control,load shedding strategies,inertia of the system with different volumes of disturbances to understand their impact on frequency stability. 展开更多
关键词 Emergency control frequency stability storm security wind power
All-fiber-based ultrastable laser with long-term frequency stability of 1.1×10-14 认领 引用 被引量：4
15
作者 黄亚峰 胡笛 +8 位作者 叶美凤 王亚婷 李彦黎 李明 陈胤男 屈求智 汪凌珂 刘亮 李唐 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第3期84-89,共6页
We demonstrate an ultrastable miniaturized transportable laser system at 1550 nm by locking it to an optical fiber delay line[FDL].To achieve optimized long-term frequency stability,the FDL was placed into a vacuum ch... We demonstrate an ultrastable miniaturized transportable laser system at 1550 nm by locking it to an optical fiber delay line[FDL].To achieve optimized long-term frequency stability,the FDL was placed into a vacuum chamber with a five-layer thermal shield,and a delicate two-stage active temperature stabilization,an optical power stabilization,and an RF power stabilization were applied in the system.A fractional frequency stability of better than 3.2×10^[-15]at 1 s averaging time and1.1×10^[-14]at 1000 s averaging time was achieved,which is the best long-term frequency stability of an all-fiber-based ultrastable laser observed to date. 展开更多
关键词 fiber delay line frequency stability ultrastable laser
暂未订购 下载PDF
Improving frequency stability of laser by means of temperature-controlled Fabry-Perot cavity 认领 引用 被引量：5
16
作者 赵法刚 潘庆 彭堃墀 《Chinese Optics Letters》 EI CAS 2004年第6期334-336,共3页
The frequency stability of an all-solid-state Nd:YVO4 laser is significantly improved by means of a specially designed Fabry-Perot (F-P) interferometer used for the frequency standard in the frequency-stabilizing syst... The frequency stability of an all-solid-state Nd:YVO4 laser is significantly improved by means of a specially designed Fabry-Perot (F-P) interferometer used for the frequency standard in the frequency-stabilizing system. The ten.peraturo of the F-P cavity is accurately controlled by a set of thermoelectric cooler (TEC) modules attached on th dy of the cavity and the electronic feedback circuit. We find that the long-term unidirectional frequency shift of the output laser, resulting from the slow increase of the cavity length under the effect of the temperature integration on the cavity body, is essentially eliminated. The frequency stability of the output laser with the power of 530 mW is better than ±200 kHz in 1 minute and ±2.3 MHz iu 40 minutes, respectively. The fluctuation of output power is smaller than ±0.5% over one hour. 展开更多
关键词 Frequency stability Solid state lasers Temperature control Thermoelectric equipment
暂未订购 下载PDF
Frequency regulation reserve optimization of wind-PV-storage power station considering online regulation contribution 认领 引用
17
作者 Changping Sun Xiaodi Zhang +4 位作者 Wei Zhang Jiahao Liu Zubing Zou Leying Li Cheng Wang 《Global Energy Interconnection》 EI CSCD 2025年第3期433-446,共14页
The frequency regulation reserve setting of wind-PV-storage power stations is crucial.However,the existing grid codes set up the station reserve in a static manner,where the synchronous generator characteristics and f... The frequency regulation reserve setting of wind-PV-storage power stations is crucial.However,the existing grid codes set up the station reserve in a static manner,where the synchronous generator characteristics and frequency-step disturbance scenario are considered.Thus,the advantages of flexible regulation of renewable generations are wasted,resulting in excessive curtailment of wind and solar resources.In this study,a method for optimizing the frequency regulation reserve of wind PV storage power stations was developed.Moreover,a station frequency regulation model was constructed,considering the field dynamic response and the coupling between the station and system frequency dynamics.Furthermore,a method for the online evaluation of the station frequency regulation was proposed based on the benchmark governor fitting.This method helps in overcoming the capacity-based reserve static setting.Finally,an optimization model was developed,along with the proposal of the linearized solving algorithm.The field data from the JH4#station in China’s MX power grid was considered for validation.The proposed method achieves a 24.77%increase in the station income while ensuring the system frequency stability when compared with the grid code-based method. 展开更多
关键词 Frequency stability Wind-PV-storage power station Frequency regulation Reserve optimization Frequency dynamics Benchmark governor
暂未订购 下载PDF
Frequency-fixed grid-forming control for less-dynamic and safer renewable power systems 认领 引用
18
作者 Yong Min Zhenyu Lei +4 位作者 Lei Chen Fei Xu Boyuan Zhao Zongxiang Lu Ling Hao 《iEnergy》 EI 2025年第4期219-234,共16页
Grid-forming(GFM)control is a key technology for ensuring the safe and stable operation of renewable power systems dominated by converter-interfaced generation(CIG),including wind power,photovoltaic,and battery energy... Grid-forming(GFM)control is a key technology for ensuring the safe and stable operation of renewable power systems dominated by converter-interfaced generation(CIG),including wind power,photovoltaic,and battery energy storage.In this paper,we challenge the traditional approach of emulating a synchronous generator by proposing a frequency-fixed GFM control strategy.The CIG endeavors to regulate itself as a constant voltage source without control dynamics due to its capability limitation,denoted as the frequency-fixed zone.With the proposed strategy,the system frequency is almost always fixed at its rated value,achieving system active power balance independent of frequency,and intentional power flow adjustments are implemented through direct phase angle control.This approach significantly reduces the frequency dynamics and safety issues associated with frequency variations.Furthermore,synchronization dynamics are significantly diminished,and synchronization stability is enhanced.The proposed strategy has the potential to realize a renewable power system with a fixed frequency and robust stability. 展开更多
关键词 Converter interfaced generation grid-forming control frequency stability active power control synchronization stability renewable power system
暂未订购 下载PDF
Frequency stability of an RF oscillator with an MEMS-based encapsulated resonator 认领 引用 被引量：4
19
作者 彭波华 骆伟 +3 位作者 赵继聪 袁泉 杨晋玲 杨富华 《Journal of Semiconductors》 EI CAS CSCD 2015年第7期103-107,共5页
This paper presents a high-Q RF MEMS oscillator consisting of a micro-disk resonator and low noise feedback circuits. The oscillator has high frequency stability and low phase noise. The two-port resonator was hermeti... This paper presents a high-Q RF MEMS oscillator consisting of a micro-disk resonator and low noise feedback circuits. The oscillator has high frequency stability and low phase noise. The two-port resonator was hermetically encapsulated using low-cost Sn-rich Au-Sn solder bonding, which significantly improves the frequency stability. A low noise oscillator circuit was designed with a two-stage amplifying architecture which effectively improves both the frequency stability and phase noise performance. The measured phase noise is -96 dBc/Hz at 1 kHz offset and-128 dBc/Hz at far-from-carrier offsets. Moreover, the medium-term frequency stability and Allan deviation of the oscillator are 4-4 ppm and 10 ppb, respectively. The oscillator is a promising component in future wireless communication application. 展开更多
关键词 MEMS disk resonator oscillator phase noise frequency stability encapsulation
暂未订购 下载PDF
Dynamic Stability Analysis of Caisson Breakwater in Lifetime Considering the Annual Frequency of Severe Storm 认领 引用
20
作者 王禹迟 王元战 洪宁宁 《China Ocean Engineering》 SCIE EI CSCD 2015年第2期287-300,共14页
In the dynamic stability analysis of a caisson breakwater, most of current studies pay attention to the motion characteristics of caisson breakwaters under a single periodical breaking wave excitation. And in the life... In the dynamic stability analysis of a caisson breakwater, most of current studies pay attention to the motion characteristics of caisson breakwaters under a single periodical breaking wave excitation. And in the lifetime stability analysis of caisson breakwater, it is assumed that the caisson breakwater suffers storm wave excitation once annually in the design lifetime. However, the number of annual severe storm occurrence is a random variable. In this paper, a series of random waves are generated by the Wen Sheng-chang wave spectrum, and the histories of successive and long-term random wave forces are built up by using the improved Goda wave force model. It is assumed that the number of annual severe storm occurrence is in the Poisson distribution over the 50-year design lifetime, and the history of random wave excitation is generated for each storm by the wave spectrum. The response histories of the caisson breakwater to the random waves over 50-year design lifetime are calculated and taken as a set of samples. On the basis of the Monte Carlo simulation technique, a large number of samples can be obtained, and the probability assessment of the safety of the breakwater during the complete design lifetime is obtained by statistical analysis of a large number of samples. Finally, the procedure of probability assessment of the breakwater safety is illustrated by an example. 展开更多
关键词 caisson breakwater dynamic stability lifetime wave spectrum annual storm frequency
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 5 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈