电工技术学报  2020, Vol. 35 Issue (7): 1538-1552    DOI: 10.19595/j.cnki.1000-6753.tces.190456
电力系统 |
孤岛微电网序阻抗建模与高频振荡抑制
刘津铭, 陈燕东, 伍文华, 张焜, 罗安
国家电能变换与控制工程技术研究中心(湖南大学) 长沙 410082
Sequence Impedance Modeling and High-Frequency Oscillation Suppression Method for Island Microgrid
Liu Jinming, Yan Dongchen, Wu Wenhua, Zhang Kun, Luo An
National Electric Energy Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China
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摘要 孤岛微电网无大电网支撑,源-荷电力电子装备间强交互耦合,易发生高频振荡等稳定性问题。对此,提出了一种离网源脉宽调制(PWM)逆变器的阻抗重构控制方法,可提高离网源PWM逆变器的输出序阻抗在高频处的相位,增加系统阻尼,能有效抑制系统高频振荡。采用谐波线性化方法,建立离网源PWM逆变器的小信号宽频带正、负序阻抗模型。为了进一步分析孤岛系统的源-荷交互稳定性,建立负荷PWM整流器的正、负序阻抗模型。然后,根据所建宽频带正、负序阻抗模型和Nyquist稳定性判据分析了控制方法、负荷类型、负荷功率大小对孤岛微电网系统稳定性的影响,揭示了孤岛微电网中源PWM逆变器与负荷PWM整流器型负荷交互发生高频振荡的本质原因:在高频处孤岛逆变器的输出阻抗具有负电阻值容性阻抗特性,而PWM整流器型负荷的输入阻抗为感性,导致系统阻抗比不满足稳定判据。所提阻抗重构控制方法,通过增加电压反馈支路,以改善孤岛逆变器在高频处的相位特性,增加系统阻尼,提高系统稳定性。最后,实验验证了本文分析的正确性。
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关键词 孤岛微电网小信号序阻抗建模交互耦合高频振荡抑制    
Abstract:The isolatedisland microgrid has no large grid support, and the source-load power electronic equipment is strongly interactively coupled, which is prone to stability problems such as high frequency oscillation. In this regard, the impedance reconstruction control method of the isolated island inverter is proposed, which can improve the phase of the output sequence impedance of the isolated island inverter at high frequency, increase system damping and effectively suppress the high frequency oscillation of the system. A small-signal wideband positive and negative sequence impedance model of the off-grid source PWM inverter is established by using the harmonic linearization method. In order to further analyze the interaction stability of the island system, the positive and negative sequence impedance model of the load PWM rectifier is established. Then, according to the established impedance model and Nyquist stability criterion, the influence of control method, load type and load power on the stability of the isolated island microgrid system is analyzed. The essential reason for the high frequency oscillation of the isolated island inverter and the PWM rectifier type load interaction in the island microgrid is revealed: the output impedance of the isolated island inverter is negatively resistive-capacitive at high frequency, and the input impedance of the PWM rectifier type load is Inductive, causing the system impedance ratio not to meet the stability criteria. The proposed impedance reconstruction control method can improve the phase characteristics of the isolated island inverter at high frequencies and increase the stability of the system by adding the voltage feedback branch.Finally, the experiment verifies the correctness of the analysis in this paper.
Key wordsIsolated island microgrid    small signal sequence impedance modeling    interaction coupling    high frequency oscillation suppression   
收稿日期: 2019-04-22      出版日期: 2020-04-07
PACS: TM464  
基金资助:国家自然科学基金项目(51577056,51707061)和博士后创新人才支持计划(BX20180095,BX20190109)资助
通讯作者: 陈燕东 男,1979年生,教授,博士生导师,研究方向为分布式发电、微电网控制、电能质量控制。E-mail:yandong_chen@hnu.edu.cn   
作者简介: 刘津铭 男,1995年生,硕士研究生,研究方向为新能源发电装备建模及其振荡抑制。E-mail:1602501151@qq.com
引用本文:   
刘津铭, 陈燕东, 伍文华, 张焜, 罗安. 孤岛微电网序阻抗建模与高频振荡抑制[J]. 电工技术学报, 2020, 35(7): 1538-1552. Liu Jinming, Yan Dongchen, Wu Wenhua, Zhang Kun, Luo An. Sequence Impedance Modeling and High-Frequency Oscillation Suppression Method for Island Microgrid. Transactions of China Electrotechnical Society, 2020, 35(7): 1538-1552.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190456          https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I7/1538