基于激磁涌流抑制的动态电压调节器控制策略  

Control Strategy of Dynamic Voltage Regulator Based on Inrush Current Mitigation Method

作　　者：刘硕[1] 姜齐荣[1] 

机构地区：[1]清华大学电机系电力系统国家重点实验室,北京市100084

出　　处：《电力系统自动化》2007年第21期58-62,共5页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2002AA306341)~~

摘　　要：为解决动态电压调节器(DVR)研制中的一类关键问题——耦合变压器激磁涌流问题,对DVR的控制策略进行了研究。首先分析了滤波环节位于DVR装置侧时,已有激磁涌流抑制方法将在滤波电容中产生瞬态过电流的问题;继而讨论了传统双闭环控制策略中恒定比例系数无法满足瞬态、稳态双重需求的局限性;据此提出了闭环比例系数由瞬态向稳态衰减过渡的新型变参数控制策略。该策略在避免了激磁涌流的基础上,限制了逆变器与滤波电容间的瞬态过流,优化了逆变器和变压器的工作状态,增强了DVR的补偿效果。最后,利用仿真实验对该策略的实用性和有效性进行了验证。Inrush current is a maior problem in the coupled transformer Of a dynamic voltage regulator （DVR）. To solve the problem, a novel control strategy for DVR is investigated. The present inrush current mitigation method will cause transient overflowing curr^nts in the filter caPacitor if the filter is located before the transformer. And the conventional dual closed-loop strategy with a constant proportional parameter cannot meet.demands of both transient and steady states performances. Based on this, a novel strategy is proposed which uses variable parameters reflecting the decaying process from the transient state to the steady state. The strategy not only mitigates the transformer inrush current but also limits the transient overflowing current in the filter capacitor and inverter. Such a design optimizes the inverter and transformer performance, and enhances compensation effects. It is also validated by the simulation results.

关 键 词：动态电压调节器 串联变压器 激磁涌流 变参数 闭环控制 

分 类 号：TM761[电气工程—电力系统及自动化]