To cope with the serious harmonics and low power factor in electrolysis plant which caused by rectifier, a novel compensation strategy for harmonic suppression and power factor correction was proposed in this paper. In this compensation strategy the combined compensation system consists of Static Var Compensator (SVC) and Hybrid Active Power Filters (HAPF). The reactive power can be compensated rapidly by SVC which consist of Thyristor Controlled Reactor (TCR) and Thyristor Switched Capacitor (TSC).The HAPF has the function of suppressing harmonic current caused by SVC and the rectifier devices, also damping the resonance between the passive filter and the equivalent inductance of the power network. The operational principle and control strategy of the compensation system are analyzed in detail and the digital simulation is performed. The feasibility and the validity of the combined compensation system is validated by the theoretic analyze and simulation results.
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