Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow

Considering the bidirectional three-phase DC/AC converter, it presents different impedance characteristics on AC side under different power flow directions, resulting in different stability margin. This may cause the system instability at high-power level. This directionally oriented stability diffe...

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Main Authors: Li Liu, Kun Wang, Fei Peng, Yanjun Tian, Yi Wang
Format: Article
Language:English
Published: MDPI AG 2022-10-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/15/19/7269
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author Li Liu
Kun Wang
Fei Peng
Yanjun Tian
Yi Wang
author_facet Li Liu
Kun Wang
Fei Peng
Yanjun Tian
Yi Wang
author_sort Li Liu
collection DOAJ
description Considering the bidirectional three-phase DC/AC converter, it presents different impedance characteristics on AC side under different power flow directions, resulting in different stability margin. This may cause the system instability at high-power level. This directionally oriented stability difference has not been paid enough attention in the grid-connected converter control. To mitigate the stability variations under bidirectional power flow, a dynamic grid voltage-based impedance reshaping control is proposed in this paper. The proposed method extracts the grid voltage dynamic component, and correspondingly compensates the power output, which is capable of regulating the power output coordinated with voltage dynamics in both power flow directions, neutralizing the stability difference and enhancing the bidirectional power flow stability. Unlike the conventional unidirectional damping optimization control in the current loop, the proposed control method can maintain satisfied stability under bidirectional power flow through the grid side voltage, which can avoid increasing the current loop delay, and thus endow the converter flexible bidirectional power process capability. The effectiveness of the proposed method has been verified by both simulations and experiments.
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spelling doaj.art-86e9fb94d07a4a6cb85da87a3d28f0432023-11-23T20:16:05ZengMDPI AGEnergies1996-10732022-10-011519726910.3390/en15197269Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power FlowLi Liu0Kun Wang1Fei Peng2Yanjun Tian3Yi Wang4Zhoushan Power Supply Company State Grid Zhejiang Electric Power Ltd., Zhoushan 316000, ChinaDepartment of Electrical Engineering, North China Electric Power University, Baoding 071003, ChinaDepartment of Electrical Engineering, North China Electric Power University, Baoding 071003, ChinaDepartment of Electrical Engineering, North China Electric Power University, Baoding 071003, ChinaDepartment of Electrical Engineering, North China Electric Power University, Baoding 071003, ChinaConsidering the bidirectional three-phase DC/AC converter, it presents different impedance characteristics on AC side under different power flow directions, resulting in different stability margin. This may cause the system instability at high-power level. This directionally oriented stability difference has not been paid enough attention in the grid-connected converter control. To mitigate the stability variations under bidirectional power flow, a dynamic grid voltage-based impedance reshaping control is proposed in this paper. The proposed method extracts the grid voltage dynamic component, and correspondingly compensates the power output, which is capable of regulating the power output coordinated with voltage dynamics in both power flow directions, neutralizing the stability difference and enhancing the bidirectional power flow stability. Unlike the conventional unidirectional damping optimization control in the current loop, the proposed control method can maintain satisfied stability under bidirectional power flow through the grid side voltage, which can avoid increasing the current loop delay, and thus endow the converter flexible bidirectional power process capability. The effectiveness of the proposed method has been verified by both simulations and experiments.https://www.mdpi.com/1996-1073/15/19/7269grid-connected converterimpedance interactionstability analysisbidirectional controlimpedance control
spellingShingle Li Liu
Kun Wang
Fei Peng
Yanjun Tian
Yi Wang
Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow
Energies
grid-connected converter
impedance interaction
stability analysis
bidirectional control
impedance control
title Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow
title_full Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow
title_fullStr Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow
title_full_unstemmed Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow
title_short Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow
title_sort dynamic grid voltage based impedance reshaped control for the stability enhancement of grid connected dc ac converter system under bidirectional power flow
topic grid-connected converter
impedance interaction
stability analysis
bidirectional control
impedance control
url https://www.mdpi.com/1996-1073/15/19/7269
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