CAJ | 학술논문

随着特高压、高压直流输电工程陆续投产，交直流混合电力系统已越来越普遍，交直流系统间耦合关系也越来越复杂。介绍了±500 kV林枫直流双极闭锁故障，交流系统扰动使得直流系统发生多次换相失败，导致直流换相失败保护动作而闭锁；采用在线数据仿真复现直流闭锁过程的基础上，分析直流闭锁对交流电网潮流、电压的影响，比较分析在线数据仿真结果与能量管理系统(energy management system，EMS)实测数据的差异，详细分析差异原因；从交直流系统间影响、直流仿真程序优化、电网运行控制等方面提出相关研究建议与思路。
수착특고압、고압직류수전공정륙속투산，교직류혼합전력계통이월래월보편，교직류계통간우합관계야월래월복잡。개소료±500 kV림풍직류쌍겁폐쇄고장，교류계통우동사득직류계통발생다차환상실패，도치직류환상실패보호동작이폐쇄；채용재선수거방진복현직류폐쇄과정적기출상，분석직류폐쇄대교류전망조류、전압적영향，비교분석재선수거방진결과여능량관리계통(energy management system，EMS)실측수거적차이，상세분석차이원인；종교직류계통간영향、직류방진정서우화、전망운행공제등방면제출상관연구건의여사로。
ABSTRACT:With the putting into operation of UHVDC and EHVDC power transmission projects one after another, the occurrence of hybrid AC/DC power grids becomes a general trend and it makes the coupling between AC and DC power systems more and more complicated. The bipolar blocking occurred in ±500kV EHVDC power transmission line from Tuanlin to Fengjing is presented. Due to the disturbance from AC system, multi-times of commutation failures in the DC system occurred and it led to the action of DC commutation failure protection, and then the bipolar blocking in DC transmission line happened. The bipolar blocking process in the DC transmission line is reappeared by online data simulation and on this basis the impacts of DC bipolar blocking on power flow and voltage in AC system are analyzed; the differences between the results of online data simulation and the measured data of energy management system (EMS) are compared and analyzed, and the reasons leading to the differences are analyzed in detail;suggestions and thinking for related research are proposed in aspects of the impacts between AC and DC systems, the optimization of DC simulation program, the operation and control of power grid and so on.