基于dSPACE的三相PWM变换器建模与控制

摘要

为提高三相PWM变换器在电能回馈时的功率因数，减少注入电网的谐波，基于dSPACE平台实现了对三相PWM变换器的实时控制。建立了在两相旋转坐标系下的小信号模型，采用电压电流双闭环控制构建了控制系统，结合前馈解耦的控制方式，并给出了控制参数的计算方法。分别在Matlab/Simulink和dSPACE平台对三相PWM双向变换器进行了实时仿真和控制。实验结果表明，该控制算法可使变换器运行在单位功率因数，且根据系统状态自动在整流和逆变模式之间切换，实现了能量的双向流动。实验结果可以广泛应用于电能回馈领域。%In order to improve the power factor and reduce harmonic of the three-phase pulse width modulation (PWM)converter in the power feedback,dSPACE-based platform was implemented to achieve real-time control of three-phase PWM converter. Small signal mathematical models under the rotating coordinate axis were built. It adopted the closed loop control technology of voltage and current,and combining feedforward decoupling control method, the method of calculating the parameter was given. With the platform of Matlab/Simulink and dSPACE,the real-time simulink and control is implemented to a PWM converter system. The experimental results indicate that the system can nearly operate at unit power factor, and automatically switch between rectifying and inverting mode according to the state of the system so that power bidirectional transforming is realized. The experimental result can be widely used in power feedback system.