Improved Voltage Control Strategy for Photovoltaic Grid-Connected System Based on DoubleLayer Coordination Control  

作　　者：戚艳 贾宏杰 

机构地区：[1]Key Laboratory of Smart Grid of Ministry of Education,Tianjin University

出　　处：《Transactions of Tianjin University》2012年第4期271-278,共8页天津大学学报（英文版）

基　　金：Supported by National Basic Research Program of China ("973" Program,No. 2009CB219701 and No. 2010CB234608);Tianjin Municipal Science and Technology Development Program (No. 09JCZDJC25000);Specialized Research Fund for Doctor Discipline of Ministry of Education of China (No. 20090032110064)

摘　　要：An improved automatic voltage coordination control strategy （AVCCS） based on ;automatic voltage control （AVC） and battery energy storage control （BESC） is proposed for photovoltaic grid-connected system （PVGS） to mitigate the voltage fluctuations caused by environmental disturbances. Only AVC is used when small environ- mental disturbances happen, while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen. An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process. A benchmark low voltage distribution system including ]？VGS is established by using the commercial software Dig SILENT. Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547, and the installed battery capacity is also reduced. Meanwhile, the battery＇s service life is ex- tended by avoiding frequent charges/discharges in the control process.An improved automatic voltage coordination control strategy(AVCCS) based on automatic voltage control(AVC) and battery energy storage control(BESC) is proposed for photovoltaic grid-connected system(PVGS) to mitigate the voltage fluctuations caused by environmental disturbances.Only AVC is used when small environmental disturbances happen,while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen.An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process.A benchmark low voltage distribution system including PVGS is established by using the commercial software DIg SILENT.Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547,and the installed battery capacity is also reduced.Meanwhile,the battery's service life is extended by avoiding frequent charges/discharges in the control process.

关 键 词：photovoltaic power system voltage control pulse width modulation （PWM） inverter state ofcharge （SOC） automatic voltage coordination control strategy （AVCCS） 

分 类 号：TM615[电气工程—电力系统及自动化]