A Study on a Single-phase Control Algorithm of 4-LEG type PCS (Power Conditioning System)for Micro-grid Application by Seung Ho, Kim -Department of Electronic and Electrical Engineering The Graduate School Korea University of Technology and Education

마이크로그리드용 4-LEG 방식 PCS의 각상 개별제어 알고리즘에 관한 연구

 A Study on a Single-phase Control Algorithm of 4-LEG type PCS for Micro-grid Application

BY KIM SEUNG HO

Graduate School of Korea University of Technology and Education Electrical and Electronic Communication Engineering Electrical Engineering

ABSTRACT

AC-common bus microgrid system can overcome several weaknesses of DC microgrid system by interconnecting DC/AC inverters for renewable energy with AC network. Nevertheless, unbalanced loads in island and small community electric power system can make performances of AC microgrid system getting worse. These are because of limited voltage regulation capability and mixed power flow in voltage source inverter. In other to overcome the unbalanced load condition, this paper proposes voltage and current control algorithm of 4-LEG inverter based on single phase d-q control method, and also proposes the modeling of voltage controller using Matlab/Simulink S/W. From the S/W simulation and experiment of 250kW proto-type inverter, it is confirmed that the proposed algorithm is useful tool for design and operation of AC microgrid system.

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