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Volume 15
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10.3390/en15030965
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Article

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

by
Zheng Li
1,2,*,
Linhang Yang
2,
Daliang Yang
1,2,
Zuwen Peng
2,
Dashuai Shao
2 and
Jinbao Liu
2
1
Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China
2
College of Electrical Engineering, Guangxi University, Nanning 530004, China
*
Author to whom correspondence should be addressed.
Energies 2022, 15(3), 965; https://doi.org/10.3390/en15030965
Submission received: 29 December 2021 / Revised: 24 January 2022 / Accepted: 25 January 2022 / Published: 28 January 2022
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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 LCL filter; three-phase grid-connected inverter; indirect current control; reference current compensation; calculation delay

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MDPI and ACS Style

Li, Z.; Yang, L.; Yang, D.; Peng, Z.; Shao, D.; Liu, J. Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter. Energies 2022, 15, 965. https://doi.org/10.3390/en15030965

AMA Style

Li Z, Yang L, Yang D, Peng Z, Shao D, Liu J. Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter. Energies. 2022; 15(3):965. https://doi.org/10.3390/en15030965

Chicago/Turabian Style

Li, Zheng, Linhang Yang, Daliang Yang, Zuwen Peng, Dashuai Shao, and Jinbao Liu. 2022. "Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter" Energies 15, no. 3: 965. https://doi.org/10.3390/en15030965

APA Style

Li, Z., Yang, L., Yang, D., Peng, Z., Shao, D., & Liu, J. (2022). Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter. Energies, 15(3), 965. https://doi.org/10.3390/en15030965

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