摘要
针对大规模并网光伏电站关键部分—并网逆变器,提出适用于并网动态分析的逆变器控制方法。以光伏电站电池的最大输出功率和电网调度指定的功率因数作为受控量的参考值,采用反馈线性化控制策略,实现有功、无功功率的解耦控制,并应用级联PI调节器消除由系统参数估计不准确而产生的静态控制误差。对大规模光伏电站的简单并网系统进行建模及动态仿真,考虑不同功率因数、光照强度及母线故障等因素对逆变器控制有效性进行验证。研究表明,级联PI调节器的参数调节易于实现,且消除了传统方法的静态误差,并验证了该控制方法动态响应速度快且具有良好的稳定性。
A grid-connected inverter control method fitting for grid-connected dynamic analysis is proposed. This paper takes the maximum power output of the photovoltaic array and power factor specified by network dispatching as reference values of control variables and adopts control strategy of dynamic feedback linearization to realize decoupling control of active and reactive power. The cascade PI regulation is proposed to avoid static control error caused by inaccurate parameter estimation. The simplified power system of large-scale photovoltaic station is modeled and simulated, and the control validity of the inverter is verified considering power factor, solar radiation strength, bus fault, etc. Research results demonstrate that the parameter adjustment of PI controller is easy to realize, static error of the traditional method is also eliminated, dynamic response speed of the control method is fast and the stability is good.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2013年第22期57-63,共7页
Power System Protection and Control
基金
国家自然科学基金项目(51177010)~~
关键词
大规模并网光伏
反馈线性化
非线性解耦
级联PI调节
large-scale photovoltaic grid-connected
feedback linearization
nonlinear decoupling
cascade connection PI control
