电气工程学报 ›› 2016, Vol. 11 ›› Issue (5): 21-29.doi: 10.11985/2016.05.003

• 理论研究 • 上一篇    下一篇

基于下垂控制的并联逆变器建模与分析

吕义   

  1. 中车长春轨道客车股份有限公司 长春 130062
  • 收稿日期:2016-03-10 出版日期:2016-05-25 发布日期:2019-12-31
  • 作者简介:吕 义 男 1978年生,高级工程师,主要研究方向为轨道交通车辆。
  • 基金资助:
    国家科技支撑计划资助项目(2015BAG13B01)

Modeling and Analysis of Parallel Inverters Based on Droop Control

Lü Yi   

  1. CRRC Changchun Railway Vehicles Co., Ltd. Changchun 130062 China
  • Received:2016-03-10 Online:2016-05-25 Published:2019-12-31

摘要:

下垂控制方法在逆变器无互联线并联系统中已经得到了广泛应用,下垂控制器的系数选取对逆变器的稳定性和动态响应能力有很大影响。本文针对传统下垂控制方法的固有缺陷,引入了反映系统阻抗特性的正交变换和微分下垂分量,使改进后的下垂控制不受系统阻抗特性限制,并具有快速的动态响应能力。运用时变相量法,建立了基于下垂控制的并联逆变器小信号模型,不同于传统准稳态的小信号模型,新模型考虑到了下垂控制对逆变器输出电压的实时调整,可以更全面地反映出下垂系数对系统稳定性的影响。在已知系统参数的条件下,新模型的稳定性分析可以更精确地确立下垂系数的选取范围。实验结果表明了小信号模型稳定性分析的合理性,设计的下垂系数可以保证并联逆变器具有优良的稳定性和动态响应能力。

关键词: 下垂控制, 并联逆变器, 小信号模型, 稳定性分析

Abstract:

The droop control method has been widely used in the wireless paralleled inverters system. The coefficients selection of droop controller has a great influence on the stability and dynamic response of the inverters. Aimed at the inherent defects of the traditional droop control method, this paper introduces an orthogonal transformation reflecting system impedance characteristics and a derivative droop component, which makes the improved droop control break away the limits of system impedance characteristics and have the fast dynamic response. A small-signal model of parallel inverters based on droop control is proposed by using the time-varying phasor. Different from the traditional small-signal model with quasi-stationary assumption, the novel model takes into account the real-time adjustment of droop control to the inverter output voltage, which reflects the impact of droop coefficients on system stability more comprehensively. Under the condition of the known system parameters, the range of droop coefficients can be more accurately established by the stability analysis of the new model. Experimental results show the rationality of small-signal stability analysis and the proposed droop coefficients ensure the excellent stability and dynamic response of parallel inverters.

Key words: Droop control, parallel inverters, small-signal model, stability analys

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