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Submodule Test Circuit for MMC-based HVDC System with Reduced Current Distortion
Byuong-Jun Seo,Kwon-Sik Park,Kwang-Rae Jo,Jin-Yong Heo,Eui-Cheol Nho 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper deals with a submodule test circuit for MMC-based HVDC system. A submodule input current contains not only AC but also DC components in the real operating HVDC system. The submodule test circuit can generate submodule input current which is similar to that in real HVDC system. In order to control the submodule input current, PR, PI, and feedforward controllers are combined. Among them, the feedforward controller is used to eliminate current distortion. Simulation results for 2 kV 600 A submodule show the usefulness of the proposed control method.
Current Controller Design of a Grid Connected Inverter Using LCL Filter
Kwon-Sik Park,Byuong-Jun Seo,Kwang-Rae Jo,Jin-Yong Heo,Haksoo Kim,Eui-Cheol Nho 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This Paper proposes a current controller design method of grid connected inverter using an LCL filter without damping method. In case of a grid side current control, it is not necessary for the system to use the damping method if the ratio of the LCL filter resonant frequency to a system sampling frequency is larger than 1/6. However, if the grid impedance is changed, it is not sure whether the system is in the stable region or not. If an LPF (Low Pass Filter) is used in the feedback path of the system, the stable region of the inverter system can be expanded. This paper proposes a new current controller using the LPF in the feedback path. The proposed controller uses the HC (Harmonic Compensator) in order to improve the grid current quality. The validity of the proposed method is verified through simulation.