Development of a Test Evaluation System for Performance Assessment of Sub-module in MVDC–MVDC Converter Stations

This paper presents the development of a test evaluation system and the establishment of test procedures for assessing the performance of sub-modules applied to MVDC(medium voltage direct current) to MVDC converter stations. The proposed test system consists of a back to back circuit comprising four sub-modules and a power conversion device that supplies the operating voltage. In the absence of established standards and guidelines for MVDC systems, the test procedures are formulated based on the electrical test regulations for VSC(voltage source converter) valves used in HVDC(high voltage direct current) systems. Using the proposed test evaluation system, performance assessments of sub-modules for MVDC to MVDC converter stations are conducted.