基金项目:
国家电网公司总部科技项目“川藏联网及西北弱交流系统安全稳定特性及控制技术研究”;
Project Supported by Science and Technology Foundation of State Grid Corporation of China(the Security and Stability Characteristics and the Control Technology Research of Sichuan-Tibet Interconnection and Northwest Weak AC System);
In order to reduce influence of out-of-step oscillation center migration on system splitting, equivalent reactance and electromotive force variations caused by over-frequency generator-shedding are studied, and functional expressions of out-of-step oscillation center migration after generator-shedding are proposed based on general rule of out-of-step oscillation center migration in two-machine system. Critical curves and areas of out-of-step oscillation center migration after generator-shedding are proposed, and regularities of out-of-step oscillation center migration under influence of over-frequency generator-shedding are presented. Combined with cases of multiple serious faults in actual power grid, out-of-step oscillation center will be migrated to generator-shedding side during out-of-step oscillation process. During over-frequency generator-shedding, generators with poor stability should be removed as soon as possible to avoid out-of-step oscillation in isolated system. Simulation results have a guiding significance in adding expected fault types, considering coordination of the third defense line measures, and making arrangements for splitting devices in engineering practice.
KEY WORDS :out-of-step oscillation center migration;multiple serious faults;over-frequency generator-shedding;splitting;
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