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3-레벨 Hybrid ANPC 인버터의 양방향 운전 성능 분석
권봉현(Bong Hyun Kwon),김상훈(Sang-Hun Kim),배규철(Kyu-Chul Bae),이교범(Kyo-Beum Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.10
This paper analyzes the performance of a three-level hybrid active neutral-point clamped (ANPC) inverter in a bidirectional operation. In the bidirectional operation where electrical energy flows from dc source to ac grid and vice versa, a weakness of neutral-point-clamped (NPC) inverter is an unequal loss distribution between four silicon (Si) switching devices. A leg of the hybrid ANPC inverter consists of the four Si insulated gate bipolar transistors (IGBTs) and two silicon carbide (SiC) active switches. Only two SiC metal oxide semiconductor field effect transistors (MOSFETs) take all the switching events using redundant switching states but the switching losses are reduced compared to that of NPC inverter. The hybrid ANPC topology has an advantage of almost the same power loss operating as a grid-connected inverter and rectifier. The validity of the power loss analysis in the bidirectional operation is verified by a PSIM simulation model and experiment in the grid-connected three-phase three-level voltage source inverter.
계통 연계형 Hybrid ANPC 인버터를 위한 LCL-필터 설계
김예지(Ye-Ji Kim),김상훈(Sang-Hun Kim),배규철(Kyu-Chul Bae),이교범(Kyo-Beum Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.11
This paper proposes an LCL-filter design procedure for three-level hybrid active neutral point clamped (ANPC) inverters in grid-connected systems. Although more active switches are used, the hybrid ANPC inverter help to balance the loss distribution. The hybrid ANPC inverter consist of silicon insulated gate bipolar transistors (Si IGBTs) and silicon carbide metal-oxide-semiconductor field effect transistors (SiC MOSFETs). The hybrid ANPC inverter can be operated at high switching frequency compared to neutral-point-clamped (NPC) inverters. Therefore, the hybrid ANPC inverter has low switching losses due to the physical characteristic of the SiC MOSFETs. The inverter-side inductance is determined by the ripple factor of the hybrid ANPC inverter. To calculate the ripple factor, the output current ripple is required. In the grid-connected inverter, the output current ripple is related to the grid voltage, output phase voltage, and inductance. Thus, the inductance is calculated by using the equation of ripple factor. The filter capacitance is designed by the reactive power absorption ratio and the grid-side inductance is determined by the ripple attenuation factor. The effectiveness of the proposed LCL-filter design method for the hybrid ANPC inverters was verified by the simulation results and experimental results.