电力建设2026，Vol.47Issue(2)：161-173,13.DOI:10.12204/j.issn.1000-7229.2026.02.013
分布式光伏接入配电网的暂态电压-频率耦合机理分析
Analysis of Transient Voltage-Frequency Coupling Mechanisms in Distribution Networks with Distributed Photovoltaic Integration
摘要
Abstract
[Objective]In response to the insufficient distribution network support and altered voltage-frequency coupling characteristics caused by the reduced inertia of the main grid due to large-scale renewable energy integration,this paper studies the transient voltage-frequency coupling mechanisms in distribution networks with distributed photovoltaic(DPV)integration.It aims to provide a theoretical basis for the development of an optimization and control strategy for the stable operation of distribution networks with high renewable energy penetration.[Methods]Based on the IEEE 33-bus system,the transient voltage and frequency response characteristics before and after DPV integration were analyzed.It was found that the dynamic coupling between voltage and frequency becomes more pronounced during renewable energy-dominated transients,with frequency issues being more critical under low-inertia conditions.The underlying causes of transient voltage sags and frequency fluctuations were explored,clarifying that the interaction between DPV and the network is a key factor in voltage-frequency coupling.From the perspective of power balance,the coupling mechanism between voltage and frequency during transients was elucidated by quantifying the dynamic relationship between active power variations in main grid and distribution networks.[Results]Simulations demonstrated that the transient response characteristics of DPV dominate voltage changes and further disturb frequency during transients.In low-inertia systems,the low-voltage ride-through(LVRT)process of DPV not only determines the voltage sag and recovery but also indirectly disturbs system frequency through its reactive power support.During transients,voltage changes alter the active power supply-demand relationship on the distribution network side,disrupting active power balance and leading to frequency fluctuations through power interactions between main grid and distribution networks.This clarifies the dominant path through which voltage changes disturb frequency.[Conclusion]This paper quantitatively describes the coupling relationship between voltage and frequency and reveals that the coupling mechanism is essentially a dynamic transmission process of"voltage fluctuation→active power imbalance→frequency response".The reactive-active power coupling characteristics of DPV exacerbate the complexity of voltage-frequency coupling.The clarification of this mechanism provides a theoretical basis for the development of voltage-frequency coordinated control strategies to suppress frequency fluctuations.关键词
配电网/电压频率耦合/分布式光伏(DPV)/低惯量/功率平衡/低压穿越(LVRT)/协同控制Key words
distribution network/voltage-frequency coupling/distributed photovoltaics(DPV)/low inertia/power balance/low voltage ride-through(LVRT)/coordinated control分类
信息技术与安全科学引用本文复制引用
唐志鹏,尹纯亚,李凤婷,李光明,熊莉,刘万..分布式光伏接入配电网的暂态电压-频率耦合机理分析[J].电力建设,2026,47(2):161-173,13.基金项目
国家自然科学基金项目(52567015) （52567015）
新疆维吾尔自治区天山英才-青年托举人才项目(2024TSYCQNTJ0008) This work is supported by National Natural Science Foundation of China(No.52567015)and Xinjiang Uygur Autonomous Region Tianshan Talents-Youth Talent Project(No.2024TSYCQNTJ0008). （2024TSYCQNTJ0008）
