摘要
针对风电场中静止同步补偿器(STATCOM)数学模型的多变量、非线性和强耦合特性,提出一种非线性PI控制和前馈解耦控制相结合的STATCOM电压双闭环控制策略。在该控制策略中,STATCOM公共连接点电压和STATCOM逆变器直流侧电压的控制均采用了基于跟踪微分器的非线性PI控制,STATCOM逆变器输出电流的控制采用了前馈解耦控制。电压外环非线性PI控制提高了装置的响应速度和鲁棒性,电流内环前馈解耦控制实现了对逆变器输出电流有功分量和无功分量的解耦控制。仿真结果表明,采用所提控制策略时STATCOM在固定工况和工况发生变动的情况下均表现出了良好的控制性能,满足应用要求。
Considering the characteristics of the mathematical model of static synchronous compensator （STATCOM）, such as multi-variable, nonlinearity and strong coupling, nonlinear PI control and feed-forward decoupling control are combined in the voltage control strategy for double closed loop in STATCOM. The nonlinear PI control based on tracking differentiator is used in the outer voltage control at the point of common coupling （PCC） of STATCOM and the DC- side voltage control of STATCOM converter, thus the goal of quick response and good robustness is achieved. The feedforward decoupling control is adopted in the inner current control of STATCOM converter to solve the coupling problem between the active and reactive components of output current. Simulation results indicate that the control strategy proposed in this paper has excellent control performance under both the fixed and changing operation conditions, which can satisfy the requirements of applications.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2017年第11期81-86,共6页
Proceedings of the CSU-EPSA
基金
湖南省教育厅重点科学研究资助项目(15A170)
湖南省科技计划资助重点项目(2016TP1023)
关键词
风电场
静止同步补偿器
电压控制策略
非线性PI控制
前馈解耦控制
wind farm
static synchronous compensator （STATCOM）
voltage control strategy
nonlinear PI control
feed-forward decoupling control
