| 引用本文: | 李浩然,杨旭红,冯成臣.多逆变器并联下的输出阻抗分析和改进下垂控制策略研究[J].电力系统保护与控制,2015,43(20):29-35.[点击复制] |
| LI Haoran,YANG Xuhong,FENG Chengchen.Control strategy research of output impedance analysis and improved droopcontrol based on multiple-inverters parallel[J].Power System Protection and Control,2015,43(20):29-35[点击复制] |
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| 摘要: |
| 在分析低压微电网多逆变器并联基本原理的基础上，引入虚拟复阻抗，并给出一种改进的下垂控制策略。通过设计虚拟复阻抗参数值，使逆变器等效输出阻抗在工频处呈阻性，提高逆变器并联的均流效果。采用电容电压和电容电流双环控制，首先通过研究虚拟复阻抗中参数选择对于抑制环流的影响，进而确定基本的参数大小。其次，通过对比输出阻抗幅频特性，具体分析在不同参数情况下对逆变器输出阻抗特性的影响。再通过理论详细分析和计算，给出一种改进的下垂控制方法，并与虚拟复阻抗结合。最后，搭建仿真模型，选取上述经过理论研究的参数值，仿真验证分析虚拟复阻抗中参数对输出电压的影响以及改进下垂控制的可行性，证实所提方法的有效性和正确性。 |
| 关键词: 逆变器并联 均流 输出阻抗 虚拟复阻抗 下垂控制 |
| DOI：10.7667/j.issn.1674-3415.2015.20.005 |
| 投稿时间：2015-01-13修订日期：2015-03-11 |
| 基金项目:上海市科技创新行动技术高新技术领域重点项目(14511101200)；上海市自然科学基金资助项目(13ZR 1417800)；上海市电站自动化技术重点实验室开放课题(13DZ2273800) |
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| Control strategy research of output impedance analysis and improved droopcontrol based on multiple-inverters parallel |
| LI Haoran,YANG Xuhong,FENG Chengchen |
| (Shanghai Key Laboratory of Power Station Automation Technology, Automatic Engineering of Shanghai
University of Electric Power, Shanghai 200090, China) |
| Abstract: |
| This paper introduces virtual complex impedance and proposes an improved droop control on the basis of analysis of multiple-inverters parallel in low voltage microgrid. Then, the output impedance of inverters can be resistive under the conditions of mains frequency, and the current-sharing of multiple-inverters parallel is improved. By using dual loops control of capacitor voltage and current, it studies the effect of parameters selection of virtual complex impedance on restraining circulation, then determines the parameters. According to the comparison of amplitude frequency characteristics of the output impedance, it analyses the characteristics of output impedance of inverter under different control parameters. And, an improved droop control is proposed and combined with virtual complex impedance through theoretic analysis and calculation. In the end, by choosing the values of parameters which have been studied, the simulation analyzes the effects of parameters of virtual complex impedance on output voltage and the advantages of the improved droop control. And the simulation results prove that the strategy proposed is effective. |
| Key words: inverters parallel current-sharing output impedance virtual complex impedance droop control |
