Impedance stability analysis and impedance remodelling of matrix converter grid-connected system

• Published in: Journal of engineering (Stevenage, England) Vol. 2020; no. 11; pp. 1131 - 1138
• Main Authors: Wang, Rutian, He, Guoqing, Zhang, Bo
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.11.2020; Wiley
• Subjects: adjustable power factor; electric impedance; harmonic linearisation method; impedance remodelling method; impedance stability analysis; input characteristics; input impedance; Matlab‐Simulink; matrix converter grid-connected system; matrix convertors; negative sequence output impedance models; Nyquist stability; Nyquist stability criterion; output characteristics; positive sequence impedance; positive sequence output impedance models; power electronic converter; power factor; power grids; power system simulation; power system stability; Research Article; power system stability; Matlab-Simulink; adjustable power factor; power system simulation; output characteristics; harmonic linearisation method; power electronic converter; power factor; matrix converter grid-connected system; input characteristics; impedance remodelling method; negative sequence output impedance models; Nyquist stability criterion; electric impedance; positive sequence impedance; input impedance; matrix convertors; positive sequence output impedance models; Nyquist stability; impedance stability analysis; power grids
• ISSN: 2051-3305; 2051-3305
• DOI: 10.1049/joe.2020.0162

Matrix converter has become one of the research hotspots of power electronic converter due to its excellent input and output characteristics and adjustable power factor. To study the stability of the matrix converter grid-connected system, the harmonic linearisation method is adopted to model the positive and negative sequence output impedance models of the matrix converter grid-connected system. The stability of the system is analysed by judging whether the plot of the ratio of the input impedance to the positive and negative sequence output impedance satisfies the Nyquist stability criterion. Also, an impedance remodelling method based on the positive sequence impedance is proposed to improve the stability of the system. Finally, the simulation verification is carried out by MATLAB/Simulink. The simulation results prove the correctness of the theoretical analysis and the feasibility of the impedance remodelling method.