模块化无储能型动态电压恢复器多机并联系统及控制方法

doi:10.19595/j.cnki.1000-6753.tces.250747

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摘要为了应对低压配电网多场景、多容量电压暂降补偿的需求,该文提出一种不含储能的模块化动态电压恢复器（DVR）并联系统及控制方法。首先,通过领航模块快速检测电压暂降并下发状态切换指令至各跟随模块,使各模块以准同步方式实现旁路晶闸管强迫关断。其次,在领航模块中部署电压调节器生成电流参考,通过以太网通信下发电流参考和前馈电压信号至各跟随模块,实现模块化DVR并联系统对电压暂降的有效补偿。为了克服通信延迟等对系统稳定性的影响,该文定量分析不同并联模块数、通信延迟、控制器参数下系统稳定裕度的变化规律。最后,通过RT-Lab硬件在环仿真平台验证了所提系统及控制方法在多组工况和参数下的有效性和稳定性。

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关键词 ：动态电压恢复器, 电压暂降, 无隔离变压器, 多机并联系统

Abstract：As a partial-capacity compensation device, the dynamic voltage restorer (DVR) can effectively utilize the residual voltage of the power grid, making it one of the most economical choices for voltage sag mitigation currently. At present, the distribution network has differentiated demand for DVR capacity. A high compensation capacity is required at the beginning of the line, while a lower one is needed at the end. The multi-machine parallel method can effectively address the challenge of a single DVR failing to meet diverse capacity requirements. During voltage sag compensation, rapid changes in voltage amplitude make it difficult for traditional distributed parallel methods to maintain current sharing during the DVR's compensation period.
This paper proposes a modular DVR parallel system and control method without energy storage. First, the leading module quickly detects voltage sags and issues state-switching commands to the following modules. The modules can perform forced shutdown of bypass thyristors in a quasi-synchronous manner. Second, a voltage regulator is deployed in the leading module to generate a current reference, which is communicated via Ethernet to subsequent modules, enabling effective compensation for voltage sags in the modular DVR parallel system.
Furthermore, this paper establishes an equivalent circuit model of a multi-machine DVR in the discrete domain. The relationship between communication delay and the control cycle is analyzed within the Ethernet communication architecture, and the distribution of the system stability region is studied for different numbers of parallel modules, communication delays, and controller parameters. Finally, the proposed system and control method are verified under multiple operating conditions and parameter settings using the RT-Lab hardware- in-the-loop simulation platform.
The following conclusions are drawn.
(1) The split topology structure with a three-phase diode rectifier bridge realizes a stable power supply to the DVR modules under the condition of no isolation transformer, maximizing the utilization of the grid's residual voltage during sag periods.
(2) During the voltage sag compensation period, the leading module generates the current reference signal and communicates it to the following modules via Ethernet, achieving efficient current-sharing control among parallel DVR modules during the compensation window.
(3) Stability analysis and simulation indicate that smaller current inner loop parameters and control cycles can enhance the system's stability margin, ensuring safe and reliable operation of the system with a greater number of parallel modules. At the same time, a fast response speed can be maintained for voltage regulation during the sag compensation process.

Key words： Dynamic voltage restorer voltage sag isolation transformer-less converter parallel system

收稿日期: 2025-05-06

PACS:

TM46

基金资助:智能电网国家科技重大专项（2030）资助项目（2025ZD0806000）

通讯作者: 洪芦诚男,1985年生,教授,博士生导师,研究方向为分布式储能与新能源、人工智能应用、电力电子化配电网等。E-mail: hlc3061@seu.edu.cn

作者简介: 王程锦男,2000年生,博士研究生,研究方向为配电网电能质量控制技术、微电网电能变换技术。E-mail: chengjin_wang@tju.edu.cn

引用本文:

王程锦, 何晋伟, 张嘉正, 张宸宇, 洪芦诚. 模块化无储能型动态电压恢复器多机并联系统及控制方法[J]. 电工技术学报, 2026, 41(8): 2735-2748. Wang Chengjin, He Jinwei, Zhang Jiazheng, Zhang Chenyu, Hong Lucheng. Modular No-Energy Storage Dynamic Voltage Restorer Multi-Parallel System and Control Method. Transactions of China Electrotechnical Society, 2026, 41(8): 2735-2748.

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