DC voltage regulator stability of PWM voltage rectifiers

This paper presents two solutions for the DC voltage control of the PWM voltage converter connected to the AC mains. In the first solution the DC voltage is controlled acting in the quadrature component of the converter fundamental Park´s voltages with relation to the mains voltages. Slow responses must be imposed because of stability reasons. Also power variations through the converter produce both active and reactive power variations in the converter AC side. To improve the DC voltage response, a second control solution is presented. The converter currents in Park´s coordinates must be controlled. The DC voltage is controlled acting in the direct Park´s current component and thus acting only in the active power of the converter AC side. Faster responses are achieved. In this case power variations through the converter do not produce reactive power variations in the AC side. The system design is also presented