Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter

Zheng Li, Linhang Yang, Daliang Yang, Zuwen Peng, Dashuai Shao and Jinbao Liu
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Zheng Li: Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China
Linhang Yang: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Daliang Yang: Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China
Zuwen Peng: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Dashuai Shao: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Jinbao Liu: College of Electrical Engineering, Guangxi University, Nanning 530004, China

Energies, 2022, vol. 15, issue 3, 1-16

Abstract: NPC (neutral point clamped converter) is widely used in medium- and high-voltage grid connection because of its small power devices, simple overall structure, and easy control. This paper presents an improved indirect current control strategy for an LCL-type NPC. Firstly, the reference current is compensated to suppress the resonant peak of the LCL filter and improve the tracking accuracy of the output current. Then, with the relationship between state variables, the control structure is optimized by introducing the non-PLL control method, so that the sensors are reduced to only two sets. Finally, the traditional differential operator is improved to compensate the calculation delay in digital control. The experimental results show that the amplitude of thee grid-connected current is consistent with the reference value, the phase deviation is reduced from 7° to about 1°, and the transient response time is shortened to 1/3 of that of the traditional method.

Keywords: LCL filter; three-phase grid-connected inverter; indirect current control; reference current compensation; calculation delay (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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