文章摘要
邹小明,杜雄,王国宁,等.三相并网逆变器频率耦合机理分析及稳定性判定[J].电力系统自动化,2018,42(18):57-63. DOI: 10.7500/AEPS20170823005.
ZOU Xiaoming,DU Xiong,WANG Guoning, et al.Frequency Coupling Mechanism Analysis and Stability Judgement for Three-phase Grid-connected Inverter[J].Automation of Electric Power Systems,2018,42(18):57-63. DOI: 10.7500/AEPS20170823005.
三相并网逆变器频率耦合机理分析及稳定性判定
Frequency Coupling Mechanism Analysis and Stability Judgement for Three-phase Grid-connected Inverter
DOI:10.7500/AEPS20170823005
关键词: 三相并网逆变器  频率耦合  稳定性  等效导纳  奈奎斯特判据
KeyWords: three-phase grid-connected inverter  frequency coupling  stability  equivalent admittance  Nyquist criterion
上网日期:2018-08-14
基金项目:国家电网公司科技项目(SGCQDK00PJJS1500069)
作者单位E-mail
邹小明 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
杜雄 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044 duxiong@cqu.edu.cn 
王国宁 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
杨友耕 输配电装备及系统安全与新技术国家重点实验室(重庆大学), 重庆市 400044  
籍勇亮 国网重庆电力公司电力科学研究院, 重庆市 401123  
摘要:
      并网逆变器中控制器dq轴结构或参数的不对称会导致系统在静止坐标系下存在两个扰动频率分量相互耦合,这一耦合因素会影响系统的稳定性。文中分析了系统中这两个扰动频率的耦合机理,分别得到了两个耦合频率下的逆变器等效导纳。利用这两个导纳,采用奈奎斯特判据判定了并网逆变器系统的稳定性,相比现有采用广义奈奎斯特判据的方法,稳定性判定过程简单,便于给出系统稳定裕量,指导逆变器控制器设计。实验验证了并网逆变器系统稳定性判定结果的正确性。
Abstract:
      The asymmetric dq-axis structure or parameters of the controller in the grid-connected inverter will cause the coupling between two disturbed frequency components of the system in the static frame. This coupling factor will affect the stability of the power system. This paper analyzes the mechanism of frequency coupling, and derives the equivalent admittance of inverter under the two coupling frequency components. By using the two equivalent admittances, the stability of the grid-connected inverter system can be judged by the Nyquist criterion. Compared with the approaches using the generalized Nyquist criterion, the stability judgement process of the proposed method is simpler. By using this method, it is convenient to obtain the phase margin or gain margin of the system and guide the controller design. Finally, the correctness of the stability judgement results is verified through experiments.
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