基于空间矢量的定频直接功率控制系统研究  

Study on direct power control with constant switching frequency based on space vector

作　　者：李欣哲[1] 林明耀[1] 付兴贺[1] 韩愚拙[2] 

机构地区：[1]东南大学伺服控制技术教育部工程研究中心,江苏南京210096 [2]苏州工业园区设计院股份有限公司,江苏苏州215021

出　　处：《电工电能新技术》2014年第11期20-23,60,共5页Advanced Technology of Electrical Engineering and Energy

摘　　要：直接功率控制是三相电压型PWM整流器的一种有效控制策略,开关表作为直接功率控制的功率内环,根据瞬时功率差值变化决定开关状态。为了克服基于开关表的传统直接功率控制开关频率不固定、有功功率和无功功率解耦效果不理想的缺点,本文在分析PWM整流器模型和瞬时功率基础上提出了一种基于空间矢量调制的电压型PWM整流器直接功率控制方法。该控制结构由PI调节器和空间矢量调制模块组成,除了具有传统直接功率控制结构简单、功率因数高、动态响应好和电流畸变小的优点外,通过空间矢量调制,还具有开关频率固定、便于滤波电感设计的优点。通过Matlab/Simulink软件仿真和实验结果验证了控制方法的正确性和可行性。The direct power control （DPC） is a kind of effective control strategy of three-phase voltage-type PWM rectifier, and the power inner of DPC is constituted by a switching table. The switching states are chosen by a switching table depended on instantaneous power errors. In order to overcome the drawbacks of the unstable switch frequency and unsatisfactory decoupling performance of active and reactive power of the traditional direct power con- trol based on switching table, a novel DPC strategy of three-phase voltage-type PWM rectifier using space-vector modulation （SVM） is proposed in this paper. The strategy, which is constituted by PI controllers and a modulation by using SVW, has not only the advantages of simple algorithm, high power factor, rapid dynamic response and low current harmonic compared with the traditional DPC, but also a stable switch frequency and lower sampling fre- quency. These make the design of filter inductor easier. The simulation and experiment results confirm the validity of this method.

关 键 词：PWM整流器 直接功率控制 空间矢量调制 

分 类 号：TM351[电气工程—电机]