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A new PWM solid-state synchronous condenser (SSSC) is designed and implemented in this paper. The power circuit of this SSSC is simple as only four power semiconductor switches are used. The SSSC allows leading or lagging reactive power compensation, and continuous control of reactive power. It has a rapid response, which allows an almost instantaneous reactive current control, with low harmonic distortion in the line current. Because it uses a current control, instantaneous overcurrent protection is provided naturally, thereby increasing the reliability. The capability of the proposed synchronous condenser is estimated. To ensure a clean line current waveform is obtained, the current-tracking mechanism is analysed with a graphical aid and a critical condition is presented. The performance of the SSSC is demonstrated with some simulation and experimental results. [ABSTRACT FROM AUTHOR]