DESIGN AND IMPLEMENTATION OF A PWM SOLID-STATE SYNCHRONOUS CONDENSER

A new PWM solid-state synchronous condenser (SSSC) is designed and imp lemented in this paper. The power circuit of this SSSC is simple as on ly four power semiconductor switches are used. The SSSC allows leading or lagging reactive power compensation, and continuous control of rea ctive power. It has a rapid response, which allows an almost instantan eous reactive current control, with low harmonic distortion in the lin e current. Because it uses a current control, instantaneous overcurren t protection is provided naturally, thereby increasing the reliability . The capability of the proposed synchronous condenser is estimated. T o ensure a clean line current waveform is obtained, the current-tracki ng mechanism is analysed with a graphical aid and a critical condition is presented. The performance of the SSSC is demonstrated with some s imulation and experimental results.