Synchronization Decoupling Control Strategy for Inverter in Weak Grids

GE Luming; TANG Yong; ZHU Lingzhi; CHEN Ning; TAO Yibin

doi:10.13334/j.0258-8013.pcsee.242845

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Synchronization Decoupling Control Strategy for Inverter in Weak Grids

更新时间：2026-07-13

- Synchronization Decoupling Control Strategy for Inverter in Weak Grids
- Vol. 45, Issue 19, Pages: 7693-7706(2025)
- 作者机构：
  
  1. 可再生能源并网全国重点实验室(中国电力科学研究院有限公司), 北京市海淀区,100192
  2. 中国电力科学研究院有限公司, 北京市海淀区,100192
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.242845
  CLC：
- Published：2025
- 稿件说明：
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GE Luming, TANG Yong, ZHU Lingzhi, et al. Synchronization Decoupling Control Strategy for Inverter in Weak Grids[J]. 2025, 45(19): 7693-7706.
DOI：

GE Luming, TANG Yong, ZHU Lingzhi, et al. Synchronization Decoupling Control Strategy for Inverter in Weak Grids[J]. 2025, 45(19): 7693-7706. DOI： 10.13334/j.0258-8013.pcsee.242845.

摘要

随着新型电力系统的快速建设，新能源开始逐渐主导电力系统的稳定特性。针对弱电网下跟网型逆变器的同步稳定问题，开展机理分析和稳定性提升技术研究。首先，分析同步方式对稳定性的影响，分析有锁相环和无锁相环两种同步方式的失稳机理，可总结为：由于同步环节与电流环之间的耦合效应，导致电流指令偏离预期控制目标；其次，基于瞬时无功理论，从削弱耦合效应的角度，提出一种同步解耦控制策略；然后，基于时域指标设计参数初始值，建立考虑频率耦合效应的序阻抗模型，采用阻抗稳定性判据分析所提策略的稳定性；最后，开展实验验证工作。在不同的电网强度下，同步解耦策略均具有较好的稳定性和鲁棒性。所提策略不仅能够改善小扰动同步稳定性，而且能够显著提升暂态同步稳定性。

Abstract

With the rapid development of new power system

renewable energy is gradually dominating the stability characteristics of power system. In this paper

the synchronization stability mechanism and stability improvement technology of grid-following inverter in weak grids is researched. Firstly

the impact of synchronization methods on stability is analyzed. The instability mechanisms of two synchronization methods

namely phase locked loop (PLL) based and PLL-less method

are analyzed. It could be summarized as that due to the coupling effect between the synchronization part and current loop

the current reference deviate from the expected control target. Secondly

from the perspective of weakening the coupling effect

a synchronization decoupling control strategy based on the instantaneous reactive power theory is proposed. Then

the initial parameter values are designed using time-domain indicators. A sequence impedance model considering frequency coupling effect is established

and the stability of the proposed strategy is analyzed using impedance stability criteria. Finally

experimental validation work is carried out. The synchronization decoupling control strategy demonstrated good stability and robustness under different grid strength conditions. The proposed strategy could not only improve the small disturbance synchronization stability

but also significantly enhance the transient synchronization stability.

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Related Author

GE Luming

TANG Yong

ZHU Lingzhi

CHEN Ning

TAO Yibin

葛路明

汤涌

Related Institution

China Electric Power Research Institute, Haidian District

State Key Laboratory of Renewable Energy Grid-Integration (China Electric Power Research Institute), Haidian District

中国电力科学研究院有限公司

智能配用电装备与系统全国重点实验室(河北工业大学)，天津市北辰区

School of Electrical Engineering, Harbin Institute of Technology

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