单相电压型PWM整流器预测直接功率控制

Predictive Direct Power Control for Single-phase Voltage Source Pulse Width Modulation Rectifier

将预测直接功率控制用于单相电压型脉宽调制(PWM)整流器,通过二阶广义积分器(SOGI)构造与电网电压、电流正交的虚拟电压、电流分量来形成α,β坐标系下的两相系统。建立了单相PWM整流器在两相静止和两相旋转坐标系下的数学模型。推导和分析了旋转坐标系下的瞬时功率模型。利用此瞬时功率模型来预测单相PWM整流器的控制电压进而产生触发脉冲控制变换器。该策略具有控制系统结构简单、开关频率固定、功率响应速度快、可实现功率解耦控制等特点。1 kW样机的实验结果表明了该方案的正确性和可行性。

Predictive direct power control is applied into single-phase voltage source pulse width modulation （PWM） re- ctifier, and a virtual quartered current and voltage are constructed by using second-order generalized integrator （SOGI）. Based on these electric parameters,the α,β coordinate system is formed.The mathematical model of the two-phase st- ationary frame and two-phase rotating coordinate frame are respectively established for single-phase voltage source PWM rectifier.The instantaneous power model of rotating coordinate frame is derivated and analyzed.Using the instan- taneous power model to predict the controlling voltage of the rectifier, and thus generate a trigger pulse to control the rectifier.The control strategy has some characteristics, such as easy designing,fixed switching frequency ,with fast step response of the power, realizing decoupled power control and so on.The feasibility and correctness of the control strat- egy are verified by experimental results based on 1 kW prototype.