摘要
为保证重要负荷的供电安全,储能变流器应具备并网运行和离网运行两种基本工作模式,并能在两种模式间平滑切换。本文基于a,b,c静止坐标系,分别设计了用于三相四线制储能变流器的并网和离网模式控制策略,能够实现三相独立控制。在此基础上研究了并离网平滑切换的关键技术,能够有效避免切换时的电压和电流冲击。同时提出适用于三相独立控制的相位预同步策略,能够保证储能变流器在并网前跟踪上电网电压相位。最后在一台100 kW的储能变流器上进行实验,验证了所提策略的可行性。
In order to ensure power supply security of important loads,the energy storage converters need to work in both grid-connected mode and off-grid mode,and can switch smoothly between the two modes.In this paper,based on the a,b,c stationary frame,the control strategies of grid-connected and off-grid modes for three-phase four-wire energy storage converter are designed respectively,which can realize three-phase independent control.On this basis,the key technology of smooth switching between grid-connected and off-grid is studied,which can effectively avoid the voltage and current overshoot during switching.Meanwhile,a phase pre-synchronization strategy suitable for three-phase indepen⁃dent control is proposed,which can ensure the energy storage converter follows the grid voltage phase before grid con⁃nection.Finally,the feasibility of the proposed strategy is verified by experiments on a 100 kW energy storage converter.
作者
陈依然
陈敏
张衍
蔡浩清
Chen Yiran;Chen Min;Zhang Yan;Cai Haoqing(School of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《电力电子技术》
2025年第6期78-83,共6页
Power Electronics
基金
国家自然科学基金(52037010)。
关键词
储能变流器
三相四线
并离网切换
energy storage converter
three-phase four-wire
grid-connected and off-grid switching
