基于直接功率控制的AC-AC换流器控制策略研究

Research of the AC-AC Converter Control Strategy Based on the Direct Power Control

采用SVPWM的AC-AC换流器技术已经在实际中得到广泛的应用。针对AC-AC换流器控制方法,本文研究了一种新的控制策略,即直接功率控制(direct power control,DPC)策略。该控制策略实时检测和计算换流器的瞬时有功功率和无功功率,与给定的有功与无功功率值进行比较,发出控制信号,控制瞬时无功功率和瞬时有功功率在允许的范围。通过直接对系统的有功与无功进行控制,并网变流器能方便地实现以单位功率因数或者接近单位功率因数向电网馈送能量。最后,基于Matlab/Simulink的数字仿真验证了所设计的控制器具有很好的控制性能。

The AC-AC converter based on SVPWM technology has widely applied in technology. According to the AC-AC converter control strategy, this paper studies a new control strategy, named direct power control, DPC. This control strategy detects and calculates the instantaneous active power and reactive power of the grid real-time, and compares with giving active power and reactive power, and it can give the pulse signals of the switchers, and controls instantaneous active power and reactive power in allowing range. Through controlling the active power and reactive power directly, the PWM converter can easily transfer the active power energy to the network at unity power factor. Simulation results realized by Matlab/Simulink show that the designed control system obtains satisfying performance.