基于功率预测模型的单相PWM整流器直接功率控制

提出一种基于功率预测模型的单相PWM整流器控制策略.该控制策略通过构造与网侧电压、电流正交的虚拟电压、电流分量来形成-坐标系;在采用瞬时功率理论及功率预测算法获得电路有、无功变化量的基础上,推导了整流器交流侧的电压控制矢量,并采用单极性调制方法来保证整流器工作频率的恒定;由于取消了电流调节内环,该控制策略具有控制系统设计简单、电路抗扰动能力强、系统动态过程短等特性.仿真结果验证了所提出的控制策略的有效性.

Model-based predictive direct power control of single-phase pulse widthmodulation rectifier

A predictive direct power control strategy for single-phase pulse-width-modulation rectifier(PWM) is presented.With the actual single-phase input current and voltage,a virtual quartered current and voltage are constructed.Based on the actual and virtual current and voltage,a-synchronous frame is formed.The control vector of single PWM rectifier is achieved by using power predictive algorithm and instantaneous active and reactive power theory.Furthermore,single pole modulation strategy is used to generate the required switch pulse of converter in a constant switching frequency.Because there is no current loop in control strategy,the strategy has a lot of excellent characteristics,such as easy designing,strong anti-disturbing,fast responding,etc.Simulation results show the effectiveness of the control strategy.