基于新颖虚拟电网磁链观测器可控整流器控制

Controllable Rectifier based on a novel Virtual Line-flux-linkage Observer

PWM整流器控制中采用类似于交流电机磁链观测的方法构造了一个以虚拟电网磁链作为定向矢量的无电网电压传感器,对谐波和干扰有良好的抑制作用。传统的虚拟电网磁链采用低通滤波器代替纯积分器以克服直流偏移,但会造成一定的幅值和相角误差。在此采用两个一阶低通滤波器代替纯积分环节的新颖虚拟电网磁链观测器,可使得幅值无差且无相移。实验结果验证了观测器的可靠性和控制方案良好的动静态特性。

Using a method alike AC motor flux-linkage observe,PWM rectifier constructs a non-power-grid-voltage sensor oriented by virtual line-flux-linkage to restrain harmonic and interference effectively.However low-pass filter adopted in conventional virtual line-flux-linkage to substitute the pure integrator to least the DC drift would leads to error of amplitude and phase angle.As the discussion in this thesis, a virtual line-flux-linkage observer using two one-stage low-pass filter instead of pure integrator steady to get phase and amplitude,its reliability and favourable dynamic and static characteristic are proved by experiments.