基于改进虚拟同步发电机的预同步并网策略

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英文篇名：Strategy of pre-synchronized grid-connection based on improving virtual synchronous generator 作者：柴伦 ; 李岚 ; 李冰 ; 王浩 英文作者：Chai Lun;Li Lan;Li Bing;Wang Hao;College of Electrical and Power Engineering Taiyuan University of Technology; 关键词：虚拟同步发电机 ; 预同步 ; 相位同步 ; 无缝切换 ; 二次调频 英文关键词：virtual synchronous generator;;secondary frequency regulation;;pre-synchronized control;;phase synchronization;;seamless transform 中文刊名：NCNY 英文刊名：Renewable Energy Resources 机构：太原理工大学电气与动力工程学院; 出版日期：2019-07-20 出版单位：可再生能源 年：2019 期：v.37;No.251 基金：山西省应用基础研究项目(201701D121130) 语种：中文; 页：NCNY201907012 页数：6 CN：07 ISSN：21-1469/TK 分类号：71-76

摘要

虚拟同步发电机(Virtual Synchronous Generator,VSG)可有效缓解可再生能源并网造成的惯性下降问题,但在并网瞬间VSG容易产生暂态电流,导致切换失败。文章提出一种针对VSG孤/并网切换的预同步方法。首先,建立VSG数学模型,设计了VSG功频控制器和励磁控制器。其次,提出改进VSG算法的无偏差调频调压策略,消除了VSG在孤岛运行下的频率和电压偏差,并由锁相环采集电网相位,根据电网并网矢量原理进行相位同步,完成并网预同步设计。最后,搭建Matlab/Simulink仿真模型,实现了VSG在孤网下的二次调频调压,在此基础上完成了孤/并网无缝切换以及并网稳定运行。
        Virtual synchronous generator(VSG) as a distributed generation control strategy can effectively alleviate the inertia decline caused by large-scale grid-connection of new energy sources. However, the VSG is prone to generate transient currents at the moment of grid-connection and causes switching failure. For this reason, this paper proposes a pre-synchronized method for VSG island/grid transform. First of all, the article designs the VSG power frequency controller and excitation controller by establishing the VSG mathematical model. Secondly, a devia-tion-free frequency modulation and voltage regulation strategy of the improved VSG algorithm is proposed, which eliminates the frequency and voltage deviation of the VSG under islanding operation. Based on the phase-locked loop, the phase of the grid is acquired, and the phase synchronization is performed to complete the grid-connected pre-synchronized design according to the principle of the grid-connected vector. Finally, The Matlab/Simulink simulation model was set up to realize the secondary frequency modulation and voltage regulation of the VSG under the islanded mode, and the island/grid seamless transform is completed and steady operation in grid-connected mode.

引文

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