电气技术  2019, Vol. 20 Issue (7): 1-4    DOI:
研究与开发 |
一种应用于直流微电网的改进型下垂控制策略
徐宏健1, 赵涛2, 朱爱华1, 季宁一1
1. 南京工程学院电力工程学院,南京 211167;
2. 南京工程学院自动化学院,南京 211167
Research on a new improved droop control method for DC microgrid
Xu Hongjian1, Zhao Tao2, Zhu Aihua1, Ji Ningyi1
1. School of Electric Engineering, Nanjing Institute of Technology, Nanjing 211167;
2. School of Automation, Nanjing Institute of Technology, Nanjing 211167
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摘要 在直流微电网中,下垂控制是解决多微源系统下负荷功率分配问题的基本控制方法之一。传统下垂控制策略是基于定下垂系数的U-I下垂控制方法。该方法虽然可靠性和经济性较好,但由于系统中各微源到负载端的线路阻抗不完全相同,导致各微源对负载的输出功率不能合理分配。为此,本文提出一种基于电压偏移补偿控制和电流分配补偿控制的改进下垂控制方法。该方法利用变换器输出电压、电流平均值来校正各变换器的输出电压与电流,从而达到减小母线电压降落和提高变换器电流分配精度的目的。本文对该控制方法分别在线路阻抗不一致和公共负载波动的工况下进行了仿真,其结果验证了该控制策略的有效性。
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关键词 下垂控制直流微电网功率分配线路阻抗补偿控制    
Abstract:In the DC microgrid, droop control is one of the basic control methods to solve the problem of load power distribution in multi-micro source systems. The traditional droop control strategy is the U-I droop control which is based on fixed droop coefficient. Although this method has good reliability and economy, the output power of each micro-source to the load can’t be allocated reasonably because the line impedance of each micro-source to the load end is not identical. Therefore, an improved droop control method based on voltage offset compensation control and current distribution compensation control is proposed. The average value of output voltage and current of each converter is used to correct the output voltage and current of each converter in this method, so as to reduce bus voltage drop and improve the accuracy of current distribution of the converter. The control method is verified by simulation under the conditions of inconsistent line impedance and common load fluctuation respectively, and the results verify the effectiveness of the control strategy.
Key wordsdroop control    DC microgrid    power distribution    line impedance    compensation control   
收稿日期: 2018-12-18      出版日期: 2019-07-16
基金资助:江苏省配电网智能技术与装备协同创新中心开放基金项目(XTCX20181)
作者简介: 徐宏健(1995-),男,江苏南京浦口人,硕士研究生,主要从事电力电子及微电网技术方面的研究工作。
引用本文:   
徐宏健, 赵涛, 朱爱华, 季宁一. 一种应用于直流微电网的改进型下垂控制策略[J]. 电气技术, 2019, 20(7): 1-4. Xu Hongjian, Zhao Tao, Zhu Aihua, Ji Ningyi. Research on a new improved droop control method for DC microgrid. Electrical Engineering, 2019, 20(7): 1-4.
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