PHIL 모의시험을 이용한 다중 컨버터로 연결된 LVDC 그리드용 Test-bed 시스템 개발

Abstract

In this paper, a power hardware-in-the-loop (PHIL)-simulation-based test-bed was proposed to verify the stability and reliability of a low-voltage direct current (LVDC) grid comprising multiple converters. The test-bed comprised a source converter and a load converter with constant power load characteristics. The impedance interaction between the source and load converters was analyzed using the extra element theorem to assess the stability of the LVDC grid. Moreover, considering the non-ideal elements of the PHIL simulation system, an accurate PHIL simulation was performed to validate the stability of the LVDC grid comprising multiple converters. The effectiveness of the proposed PHIL simulation test-bed was demonstrated using a real-time simulator, an Opal-RT OP5700, a power interface, and a 0.5 kW dual-active-bridge converter. The validity of the test-bed was also verified by experiments and analysis using stability criteria.