CAJ | 학술논문

针对交直流电网出现的暂态功率倒向现象而导致继电保护误动的问题，从继电保护的视角出发，在电磁暂态时间框架下研究交直流系统相互影响机理和交流故障特征的变异机理，提出在换相失败电磁暂态过程的解析分析、特征变异对保护性能的影响评估方法和评价指标，进而给出了交直流混合电网界定暂态功率倒向的计算模型和方法。交直流系统相互作用而引发的暂态功率倒向是由交流故障和直流系统快速变化引起的2个不同扰动源同时作用于电网元件，且满足一定电气和时序条件下“竞争”的必然结果。仿真结果验证了所述模型和方法的正确性。
침대교직류전망출현적잠태공솔도향현상이도치계전보호오동적문제，종계전보호적시각출발，재전자잠태시간광가하연구교직류계통상호영향궤리화교류고장특정적변이궤리，제출재환상실패전자잠태과정적해석분석、특정변이대보호성능적영향평고방법화평개지표，진이급출료교직류혼합전망계정잠태공솔도향적계산모형화방법。교직류계통상호작용이인발적잠태공솔도향시유교류고장화직류계통쾌속변화인기적2개불동우동원동시작용우전망원건，차만족일정전기화시서조건하“경쟁”적필연결과。방진결과험증료소술모형화방법적정학성。
In view of the transient power converse leading to the malfunction of the protective relay the AC/DC power grid, the mechanism of interaction of AC/DC systems and the change of AC fault features are studied in the electromagnetic transient time framework from the viewpoint of protective relaying. The HVDC commutation failure is analyzed. The evaluation method for and indices on the influence of the resolving analysis and fault feature variation on the protection performance are proposed in the electromagnetic transient process of commutation failure. Then the method of calculating the boundary of the transient power converse is presented. The transient power converse occurring in the AC/DC power grid is an inevitable result of electric competition and time sequence competition between the disturbance due to AC fault and that due to the rapid response of HVDC. Simulation results show the validity of the model and method proposed.