STATCOM控制方法的研究

Study on Control Method of STATCOM

随着非线性负荷和冲击性负荷在电网中的广泛应用,电能质量问题成了电力系统研究的热点。从静止同步补偿器的基本结构和工作原理出发,简要介绍了电流控制策略和无功检测技术,提出一种基于瞬时无功功率理论的改进检测技术,取代传统的无功电流检测方法,消除了锁相环,简化了硬件电路的设计。利用MATLAB/Simulink软件建立了检测电路模型,分别对有畸变和无畸变的三相电源电压进行仿真,验证了改进检测方法的有效性。在此基础上,结合直流控制中的滞环控制,分别建立了感性负载和容性负载下的STATCOM系统仿真模型。仿真结果表明,所设计的补偿器具有良好的补偿效果。

With the wide application of nonlinear load and impulsive load in power network,power quality has become a hot spot in power system research.Based on the basic structure and working principle of STATCOM,the current control strategy and reactive power detection technology are briefly introduced in this paper.An improved detection technique based on instantaneous reactive power theory is proposed to replace the traditional reactive current detection method,which eliminates the phase-locked loop and simplifies the design of hardware circuit.MATLAB/Simulink software was used to build and simulate a model of the detection circuit,three-phase supply voltage with distortion and without distortion were simulated respectively to verify the validity of improved detection.On this basis,combined with hysteresis control in direct current control,the simulation model of STATCOM system is established and simulated under inductive load and capacitive load respectively.The simulation results show that the designed STATCOM has good compensation effect.