基于自然坐标与功率前馈的三相电压型PWM变流器控制  

Natural coordinate and power feedforward control of three-phase voltage-source PWM converter

作　　者：曾宪金[1] 李小为[1] 胡立坤[1] 姬丽雯 卢子广[1] 

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《电力系统保护与控制》2015年第11期13-20,共8页Power System Protection and Control

基　　金：国家自然科学基金(51177018);广西科学研究与技术开发项目(桂科攻1377001-2)~~

摘　　要：针对三相电压型PWM变流器控制系统,提出一种自然坐标与负载功率前馈控制方法。根据p-q理论在自然坐标下的表征,引入瞬时有功电压和瞬时无功电压的概念。从而基于电网电压定向的矢量控制策略引入PWM变流器的自然坐标控制方法,省去了电网相位检测和坐标系变换,降低控制复杂度。针对PWM变流器矢量控制下直流侧负载(包括有源负载和无源负载)功率波动对直流侧电压产生较大冲击和波动问题,基于功率平衡和p-q理论推导了负载扰动点到三相交流电流指令的前馈通道增益矩阵,提高PWM变流器直流侧稳压控制的鲁棒性。RCP实验证明所提方法的正确性和可行性。A new control strategy for three-phase voltage-source pulse width modulation （PWM） converter which is based on natural coordinate （abc coordinate） and power feedforward is presented. According to thep-q theory in natural coordinate, the concept of instantaneous active and reactive voltage is presented. Then the natural coordinate control method of PWM converter is combined with vector control strategy based on grid voltage orientation to reduce the control complexity, which saves grid phase detection and eliminates coordinate transformation. It puts forward a load power feedforward method to reduce the impact of load （including active and passive load） power fluctuation on DC voltage of PWM converter. Feedforward gain matrix is deduced from load disturbance to three-phase AC current instruction based on the power balance and thep-q theory, improving the robustness of the PWM converter DC voltage control. RCP experiment results show the correctness and feasibility of the above-mentioned method.

关 键 词：PWM变流器 自然坐标 无功电压 负载扰动 功率前馈 

分 类 号：TM46[电气工程—电器]