不对称故障下光伏发电系统的电压稳定控制策略  

Control Strategy of Voltage Stability of Grid-connected PV System During Asymmetrical Grid Faults

作　　者：王晓兰[1] 董振华[1] 梁琛[2] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050 [2]甘肃电力科学研究院,甘肃兰州730050

出　　处：《电气传动》2014年第12期44-48,共5页Electric Drive

基　　金：国家自然科学基金资助(50967001)

摘　　要：随着接入电网的光伏发电系统规模的逐渐增大,在电网故障下光伏发电系统的安全稳定运行尤为重要。建立了不对称电网电压条件下的光伏逆变器数学模型,分析了直流侧电压波动机理。结合陷波器的谐振特性,提出了直流电压带陷波器的正负序双电流环控制策略,并在直流侧加装直流过压保护电路。利用Matlab平台建立光伏并网发电系统仿真模型,对提出的控制策略进行仿真实验,验证了控制策略的正确性和有效性。With the large- scale photovohaic system connected the grid, it is particularly important that photovohaic system continues to running under abnormal grid conditions. A mathematical model of PV grid-connected inverter was established, and the mechanism of voltage fluctuation in DC bus was analyzed. Using resonance characteristics of notch filter, the positive-negative sequence dual current control strategy with notch filter in DC voltage was proposed. At the same time, the DC overvoltage protection circuit was installed on the DC bus. The control strategy for the photovohaic system was simulated in the Matlab platform. The results prove that the proposed control strategy is correct and effective.

关 键 词：光伏发电 不对称故障 电压稳定 陷波器 过压保护 

分 类 号：TM464[电气工程—电器]