Hydropower system switching type frequency oscillation analysis method based on phase diagram method

• Main Authors: GUO PENGCHENG, YU WEIHAO, ZHANG ZHE, XUE ANCHENG, ZHUANG WENBIN, LUO YAOHAN, LI YECHENG
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2022
• Subjects: CALCULATING; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; COMPUTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; GENERATION; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR

The invention belongs to the field of power system stability analysis, and particularly relates to a hydropower system switching type frequency oscillation analysis method based on a phase diagram method. In recent years, ultra-low frequency oscillation with the participation of a switching link occurs in domestic and overseas high-water-electricity-ratio power systems for many times, namely, frequency oscillation caused by switching of a system trajectory between different smooth systems due to saturation of an amplitude limiting link or switching of a control mode after disturbance is called as switching type frequency oscillation. In order to carry out more intuitive large-range dynamic characteristic analysis on a hydroelectric system in which different switching links jointly participate, a single-machine hydroelectric switching power system of a dead zone and an amplitude limiting link is established, and existence analysis and stability characteristic analysis of a balance point are carried out on the