负载均流的自适应虚拟阻抗下垂控制方法

发布时间：2018-03-03 19:00

本文选题：直流微电网　切入点：变换器并联运行　出处：《西南交通大学学报》2017年05期 　论文类型：期刊论文

【摘要】：为实现直流外电网系统的负载均流,提高系统稳定性,在考虑线路阻抗的前提下,提出一种基于自适应虚拟阻抗的下垂控制方法.该方法根据输出下垂特性和虚拟阻抗原理,将负载电压、电流等代入虚拟阻抗算法,对所得虚拟阻值进行适当修正,实现了虚拟阻抗的自适应修正,能够有效改善负载均流效果.在搭建的实验平台上与传统下垂控制、传统虚拟阻抗下垂控制进行实验测试与对比,结果表明:传统虚拟阻抗下垂控制方式和自适应虚拟阻抗下垂控制方式均能将负载电流差异抑制在0.04 A内,各并联单元输出电流差异小;自适应虚拟阻抗下垂控制方式的负载调整率为0.1%,具有更低的负载调整率;综合考虑输出电流差异、负载调整率、母线电压等因素,自适应虚拟阻抗下垂控制方式具有良好的负载均流优越性和系统稳定性.
[Abstract]:In order to realize load current sharing and improve system stability, a droop control method based on adaptive virtual impedance is proposed, which is based on output droop characteristic and virtual impedance principle. The load voltage and current are substituted into the virtual impedance algorithm, and the virtual resistance value is modified appropriately. The adaptive correction of the virtual impedance is realized, which can effectively improve the load current sharing effect. The traditional virtual impedance droop control is tested and compared. The results show that both the traditional virtual impedance droop control mode and the adaptive virtual impedance droop control mode can restrain the load current difference within 0.04 A. The output current difference of each parallel unit is small, the load adjustment rate of adaptive virtual impedance droop control is 0.1, the load adjustment rate is lower, and the factors such as output current difference, load adjustment rate, bus voltage and so on are considered synthetically. Adaptive virtual impedance droop control has good load current sharing advantages and system stability.
【作者单位】：西南交通大学电气工程学院;
【基金】：国家自然科学基金资助项目(61473238,51407146) 四川省杰出青年基金资助项目(2015JQ0016)
【分类号】：TM727

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