STATCOM稳定电网电压性能的仿真分析

针对电网运行电压不稳定的情况,采用静止同步补偿器(STATCOM)对电网进行无功功率补偿以稳定运行电压。文中给出了运行电压和无功功率的关系,阐述了STATCOM的基本结构与工作原理,分析了STATCOM的控制方法及策略。并根据工作原理和控制方法,在Matlab环境下搭建了基于δ和λ的双控制变量STATCOM模型。仿真结果表明,STATCOM可精确、快速地补偿电网所需无功功率,达到了稳定运行电压的目的。

Simulation, Power Quality Analysis and Improvements in a Hot Rolling Mill Using a STATCOM

This paper presents an analysis of the electric power flows in a hot rolling mill plant using a power quality analyzer and developing simulation models with Matlab-Simulink. The model inputs have been taken from process data by the process computer of the plant. Data from different rolling campaigns have been analysed. A STATCOM （static synchronous compensator） with a control strategy based on voltage oriented control with d-q coordinates is used as solution to improve the reactive compensation as well as to minimize the voltage fluctuations and sags effect. The overall electric model has been simulated with the STATCOM to check the improvement in the voltage stability and the consumption.

基于Newton-Raphson功率不匹配的电流注入潮流控制

为进一步简化电流注入潮流控制补偿方法,利用Newton-Raphson功率不匹配方法构建功率不匹配的电流注入潮流控制方法。该方法基于STATCOM总线控制网络,并利用压控总线与零功率产生所需的电压幅值作为控制指标。STATCOM的连接总线功率不匹配方程包含在Newton-Raphson电流注入潮流方程,以及其他PQ总线的电流匹配方程中。此外,利用最终的目标值在迭代过程中对STATCOM的参数进行更新。通过该总线发电方式,可减少所需的方程数目。开发的模型降低了计算机程序代码的复杂性,避免Jacobian矩阵修改,并提高可重用性。最后,对所研制的STATCOM模型的性能,使用标准IEEE测试系统进行验证。