Open Access

ARTICLE

Parameter Design of Current Double Closed Loop for T-Type Three-Level Grid-Connected Inverter

by Tiankui Sun^1,*, Mingming Shi¹, Xiaolong Xiao¹, Ping He¹, Yu Ji¹, Zhiyuan Yuan²

1 Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing, 211103, China
2 Zhenjiang Sanxin Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd., Zhenjiang, 212001, China

* Corresponding Author: Tiankui Sun. Email:

Energy Engineering 2023, 120(7), 1621-1636. https://doi.org/10.32604/ee.2023.026948

Received 05 October 2022; Accepted 26 December 2022; Issue published 04 May 2023

Abstract

To reduce current harmonics caused by switching frequency, T-type grid-connected inverter topology with LCL filter is adopted. In view of the disadvantages of the slow response speed of the traditional current control and the failure to eliminate the influence of the LCL filter on the grid-connected current by using current PI control alone, a current double closed loop PI current tracking control is proposed. Through the theoretical analysis of the grid-connected inverter control principle, the grid-connected inverter control model is designed, and the transfer function model of each control link is deduced, and the current loop PI regulator is designed at last. The simulation results show that the control strategy is feasible.

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Keywords

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