Description function-based VSC unilateral amplitude limiting participated subsynchronous oscillation analysis method

• Main Authors: GU LEI, GUO PENGCHENG, XUE ANCHENG, LIU XIAOBO, LI YECHENG, FU XIAOYU, WANG JIAWEI, WANG YUNTAO, WANG YONGJIE, QIAO DENGKE
• Format: Patent
• Language: Chinese; English
• Published: 11.06.2021
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a description function-based VSC unilateral amplitude limiting participated subsynchronous oscillation analysis method. According to the method, for the subsynchronous oscillation phenomenon of an asymmetric unilateral d-axis current amplitude limiting (AU-d-CL or upper current saturation amplitude limiting) participated grid-connected voltage source converter (VSC) system, approximate analysis is carried out by adopting a description function of unilateral amplitude limiting and a generalized Nyquist criterion. The method specifically comprises the following steps that: firstly, a simplified model of a grid-connected VSC system is established, the small disturbance stability of the simplified model is analyzed, and an AU-d-CL participated negative damped oscillation phenomenon is analyzed; secondly, a frequency domain model of the VSC system and the description function of the AU-d-CL are given; and finally, through the description function of AU-d-CL and the generalized Nyquist crite