摘要
三相PWM整流器的直接功率控制(DPC)比电压定向控制(VOC)的动态响应要快,并具有良好的抗干扰性能。提出一种新的基于虚拟电网磁链的三相电压型PWM整流器DPC策略。分析了PWM整流器工作原理,建立了电压型PWM整流器在α-β、d-q坐标系中的数学模型,并在此基础上,通过应用虚拟磁链概念,提出了三相电压型PWM整流器在α-β、d-q坐标系中的虚拟磁链模型。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。仿真结果表明:与传统的DPC方法相比较,基于虚拟磁链的三相PWM整流器DPC系统结构简单,能有效减少传感器的数量,且抗干扰能力强,电网输入电流的畸变较小,具有更好的瞬时功率动、静态控制特性。
Compared with VOC（Voltage- Oriented Control） of three- phase PWM（Pulse Width Modulation） rectifier, DPC（Direct Power Control） has quicker dynamic response and better anti-jamming performance. A DPC approach based on virtual flux is presented for three-phase voltage source PWM rectifier. The working principle of PWM rectifier is analyzed and its mathematical models are established in α-β and d-q reference frames, based on which, its virtual flux model is also put forward with virtual flux conception. Since the reactive and active powers are calculated by estimating the virtual flux, AC voltage sensors at net side could be omitted. The control system has external closed-loop control of DC voltage output and internal closed-loop control of,power. Simulation results show that, the virtual flux based DPC system has simpler structure, fewer sensors, higher anti-jamming capability, lesser input current distort, better static and dynamic control performances of instantaneous power than VOC system.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第2期82-84,共3页
Electric Power Automation Equipment
基金
湖南省教育厅科研项目(2004C181)~~
