STATCOM的自适应逆控制方法

为了研究静止同步补偿器STATCOM运行过程中存在的非线性特性对补偿特性的影响，在考虑了电压源型逆变桥中IGBT的通态损耗、开关损耗以及直流侧的电容损耗基础上，建立了基于该逆变桥的STATCOM数学模型，并根据其数学模型的非线性特性，提出了STATCOM的自适应逆控制方法和逆系统模型。根据该模型对STATCOM进行直接控制，并根据系统参数的不可预知以及其时变的特点，对系统模型中的参数在运行过程进行在线识别，并进行了仿真。结果表明，自适应逆控制能够有效地克服运行过程中系统参数的变化对补偿效果的影响，从而提高了控制系统的鲁棒性和装置的控制精确度；给定系统参数的初值准确与否，对装置最终的控制精确度没有影响。该控制方法具有实用性，而且随着处理器计算能力的不断增强该方法存在广泛的应用前帚。

Adaptive inverse control for STATCOM

In order to research on the nonlinear character of STATCOM(static synchronous compensator) when operating,mathematical model of STATCOM based on VSI is constructed which takes conducting and switching losses of IGBT and losses of capacitor on DC side into account.According to the model,STATCOM based on voltage source inverter is analyzed.Its nonlinear character is analyzed.Based on the nonlinear character adaptive inverse control is adopted.Due to unforeseeable and time-dependent character of the system parameter,on line estimation based on a least-square algorithm is proposed.Adaptive inverse control method can eliminate the effect of the uncertainty of system parameter.Simulation results verify the correction of the model and validity and feasibility of the control method.