摘要
本文提出一种基于虚拟电网磁链的三相电压型PWM整流器直接功率控制策略,分析了其工作原理。由于通过估计虚拟磁链来计算无功与有功功率,因此可省略三相PWM整流器的电网侧电压传感器,该控制系统的结构为直流输出电压外环,功率控制内环。并针对传统虚拟磁链观测方法存在初始值选取以及气流偏移等问题,提出基于级联型惯性环节的改进型虚拟磁链观测器。仿真结果表明三相电压型PWM整流器虚拟电网磁链控制运行具有良好的动、静态特性。
A direct power control approach based on virtual flux is presented for three-phase voltage source PWM rectifier, and its working principle is analyzed.Since the reactive and active powers are calculated by estimating the virtual flux, AC voltage sensors at netside could be omitted. The control system has external closed--loop control of DC Voltage output and internal closed--loop control of power. To solve the initial value and DC drift problem of traditional virtual flux observation methods, an improved virtual flux observer based on two serial inertial filter is proposed.Finally,the simulative results prove the good dynamic and static performance of the PWM rectifier under the virtual line flux linkage vector
出处
《电子测试》
2011年第2期85-89,共5页
Electronic Test
