基于功率控制的三相电压型PWM整流器控制器设计

摘要

This paper presented the controller design for three-phase voltage source PWM rectifier based on power con-trol.The mathematical model of VSR was established in accordance with principle of conservation of energy,and it can be e-quivalent to linear time-invariant system by omitting loop resistances energy and the energy consumed by charging and dis-charging of inductors.Capacitive-energy-storage control was adopted in outer loop of the system,and a current control in the inner loop.Meanwhile,power compensation of DC-load was also used to control the change rate of capacitor energy storage directly.In the inner loop,feed forward decoupling control method with PI regulator was used to make the loop equivalent to a first-order inertial element.PI control was adopted in the outer loop,and algebraic analysis and root locus analysis were used to provide PI parametric design method.The whole VSR system is equivalent to a second-order system,and the simula-tion results show that the controller design method proposed can bring VSR an excellent performance.%提出基于功率控制的三相电压型 PWM(pulse width modulation)整流器控制器设计方法。根据能量守恒原理建立的 VSR(voltage source rectifier)数学模型可通过忽略回路电阻及电感充放电所消耗的能量等效成线性定常系统。系统外环采用电容储能控制，内环采用电流控制，同时引入直流负载功率补偿，实现对电容储能变化率的直接控制。电流内环采用前馈解耦 PI(proportional-integral)控制，将内环等效成一阶惯性环节。电容储能外环采用 PI 控制，利用代数分析及根轨迹分析，提出外环 PI 参数的设计方法。VSR系统整体等效为二阶系统。仿真结果表明：本文所提出的控制器设计方法能使得 VSR 达到优异的性能。