Firefly algorithm is the new intelligent algorithm used for all complex engineering optimization problems. Power system has many complex optimization problems one of which is the optimal power flow (OPF). Basically, i...Firefly algorithm is the new intelligent algorithm used for all complex engineering optimization problems. Power system has many complex optimization problems one of which is the optimal power flow (OPF). Basically, it is minimizing optimization problem and subjected to many complex objective functions and constraints. Hence, firefly algorithm is used to solve OPF in this paper. The aim of the firefly is to optimize the control variables, namely generated real power, voltage magnitude and tap setting of transformers. Flexible AC Transmission system (FACTS) devices may used in the power system to improve the quality of the power supply and to reduce the cost of the generation. FACTS devices are classified into series, shunt, shunt-series and series-series connected devices. Unified power flow controller (UPFC) is shunt-series type device that posses all capabilities to control real, reactive powers, voltage and reactance of the connected line in the power system. Hence, UPFC is included in the considered IEEE 30 bus for the OPF solution.展开更多
In this paper, we first consider the problem of distributed power control in a Full Duplex (FD) wireless network consisting of multiple pairs of nodes, within which each node needs to communicate with its correspond...In this paper, we first consider the problem of distributed power control in a Full Duplex (FD) wireless network consisting of multiple pairs of nodes, within which each node needs to communicate with its corresponding node. We aim to find the optimal transmition power for the FD transmitters such that the network-wide capacity is maximized. Based on the high Signal-to-Interference-Plus-Noise Ratio (SINR) approximation and a more general approximation method for logarithm functions, we develop effective distributed power control algorithms with the dual decomposition approach. We also extend the work to the general FD network scenario, which can be decomposed into subproblems of isolated nodes, paths, and cycles. The corresponding power control problem is then be solved with the distributed algorithm. The proposed algorithms are validated with simulation studies.展开更多
在交流微电网中,并联运行的储能系统往往面临因储能单元荷电状态(state of charge,SOC)不一致引发的过充过放风险以及因逆变器参数偏差、线路阻抗差异导致的无功功率分配失衡等问题,劣化微电网稳定性。针对以上问题,提出了一种基于融合...在交流微电网中,并联运行的储能系统往往面临因储能单元荷电状态(state of charge,SOC)不一致引发的过充过放风险以及因逆变器参数偏差、线路阻抗差异导致的无功功率分配失衡等问题,劣化微电网稳定性。针对以上问题,提出了一种基于融合一致性控制算法的虚拟同步发电机(virtual synchronous generator,VSG)协同控制策略。首先,通过将嵌套幂指数的双曲正切均衡系数与输出有功功率参考值动态耦合,实现了输出功率自适应调整下的不同储能单元的SOC快速均衡。接着,在实现SOC均衡的基础上,设计了无功-电压协同控制策略,通过引入基于实时无功分配差异的自适应虚拟阻抗提升无功分配精度,同时增加电压补偿环节抑制电压跌落幅度。最后,仿真和实验结果验证了所提策略的有效性。展开更多
摘要Firefly algorithm is the new intelligent algorithm used for all complex engineering optimization problems. Power system has many complex optimization problems one of which is the optimal power flow (OPF). Basically, it is minimizing optimization problem and subjected to many complex objective functions and constraints. Hence, firefly algorithm is used to solve OPF in this paper. The aim of the firefly is to optimize the control variables, namely generated real power, voltage magnitude and tap setting of transformers. Flexible AC Transmission system (FACTS) devices may used in the power system to improve the quality of the power supply and to reduce the cost of the generation. FACTS devices are classified into series, shunt, shunt-series and series-series connected devices. Unified power flow controller (UPFC) is shunt-series type device that posses all capabilities to control real, reactive powers, voltage and reactance of the connected line in the power system. Hence, UPFC is included in the considered IEEE 30 bus for the OPF solution.
基金This paper was presented in part at IEEE WCNC 2015, New Orleans, LA, USA, Mar. 2015 [1]. This work is supported in part by the US National Science Foundation under Grants CNS-1247955, and by the Wireless Engineering Research and Education Center (WEREC) at Auburn University, Auburn, AL, USA.
摘要In this paper, we first consider the problem of distributed power control in a Full Duplex (FD) wireless network consisting of multiple pairs of nodes, within which each node needs to communicate with its corresponding node. We aim to find the optimal transmition power for the FD transmitters such that the network-wide capacity is maximized. Based on the high Signal-to-Interference-Plus-Noise Ratio (SINR) approximation and a more general approximation method for logarithm functions, we develop effective distributed power control algorithms with the dual decomposition approach. We also extend the work to the general FD network scenario, which can be decomposed into subproblems of isolated nodes, paths, and cycles. The corresponding power control problem is then be solved with the distributed algorithm. The proposed algorithms are validated with simulation studies.
摘要在交流微电网中,并联运行的储能系统往往面临因储能单元荷电状态(state of charge,SOC)不一致引发的过充过放风险以及因逆变器参数偏差、线路阻抗差异导致的无功功率分配失衡等问题,劣化微电网稳定性。针对以上问题,提出了一种基于融合一致性控制算法的虚拟同步发电机(virtual synchronous generator,VSG)协同控制策略。首先,通过将嵌套幂指数的双曲正切均衡系数与输出有功功率参考值动态耦合,实现了输出功率自适应调整下的不同储能单元的SOC快速均衡。接着,在实现SOC均衡的基础上,设计了无功-电压协同控制策略,通过引入基于实时无功分配差异的自适应虚拟阻抗提升无功分配精度,同时增加电压补偿环节抑制电压跌落幅度。最后,仿真和实验结果验证了所提策略的有效性。