基于PSCAD/EMTDC的三电平电压源型STATCOM的仿真研究

Simulation research of 3-level voltage-source STATCOM based on PSCAD/EMTDC

根据STATCOM的基本原理,分析和推导了其数学模型。根据其数学模型,利用PSCAD/EMTDC电力系统仿真软件建立了三电平静止同步补偿器STATCOM的仿真模型。采用SPWM调制方式和PI调节的控制策略来控制系统的直流侧电压的稳定和输出无功功率的大小,并对其进行了仿真。仿真结果证明采用此种控制策略能够达到控制要求,也说明了三电平电压源型STATCOM可以很好地补偿无功功率,提高功率因数,有效地改善电能质量。

The fundamental of STATCOM is introduced briefly, and its mathematical model is analyzed and deduced. According to the mathematical model, the simulation model of 3-level STATCOM was established by simulation software of PSCAD/ EMTDC eleetrie power system. The voltage stability of the DC side and reactive power output in the system are controlled by using SPWM modulation method and PI regulation control strategy. The system was simulated. The analysis of the simulation results proves this control strategy can achieve the control requirements, and show that the 3-level voltage-source STATCOM can compensate reactive power, improve the power factor and the power quality effectively.