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This paper proposes a new synthetic test circuit to confirm the switching behavior of thyristor valve in HVDC converter. The proposed circuit consists of a 2-phase chopper with IGBT switch and auxiliary circuit to supplies low-voltage high current to the test valve during on-state. The operation of proposed circuit was verified through theoretical approach and computer simulation. Based on computer simulation results, a hardware scaled model for the proposed circuit was built and tested to confirm the feasibility of implementing a real test facility. The proposed synthetic test circuit could be widely used to test the thyristor valve with synthetic manner.