中文摘要：

H桥级联静止同步补偿器(STATCOM)以其损耗低、响应快速、储能元件体积小和输出电流谐波含量低等优点,成为动态无功补偿装置发展的重要方向。通过对STATCOM工作原理及数学模型的分析,推导出无差拍控制算法。为了提高无差拍控制算法的实时性,消除参考电压滞后一拍的影响和抑制STATCOM输出电流的谐波,构造离散状态观测器对系统参考指令电流进行预测。构造离散滑模观测器对STATCOM实际输出电压进行观测,避免了通过直流侧电容电压参考值计算STATCOM实际输出电压的误差。仿真与实验结果表明,该算法可以精确地预测参考指令电流,进而提高了STATCOM无差拍控制的性能。

英文摘要：

With such advantages as low loss,fast dynamic response,small size and low harmonic content,the H-bridge cascaded synchronous compensator (STATCOM) has become an important development direction of the dynamic reactive power compensation equipment.In this paper,the dead-beat control algorithm is deduced via an analysis of the working principle and mathematical model for the STATCOM.To improve the real-time character of the dead-beat control algorithm, eliminate the influence of the reference voltage lag by one beat and reduce the current harmonic content of the STATCOM,a discrete state observer is constructed which can be used to predict the value of the reference command current.To avoid the error of the STATCOM actual output voltage which can be calculated by the dc side reference voltage of capacitance,the discrete sliding form observer is constructed which can be used to observe the actual output voltage of the STATCOM. Simulation and experimental results show that the algorithm can accurately predict the value of reference command current to improve the dead-beat control performance of the STATCOM.