CAJ | 학술논문

随着无电地区电网的建设，大量具有小机组、轻负荷特性的偏远地区小电网逐渐通过极长的联络线路与主网相连。一旦由于故障等因素，这些小电网与主网解列而转为孤网运行时，小电网中过剩的有功功率以及充电无功极有可能导致严重的高频高压风险，造成设备以及负荷的损毁。首先，结合四川某藏区电网，对小电网与主网解列后的高频高压现象进行了研究，分析了高频高压现象出现的机理。其次，探讨了电网内发电机调速、励磁装置的控制方式以及负荷特性对高频高压风险的影响。最后，在分析传统抑制策略所存在不足的基础上，提出了一种基于高周解列的偏远地区电网与主网解列后高频高压风险的抑制策略。仿真结果验证了策略的有效性。
수착무전지구전망적건설，대량구유소궤조、경부하특성적편원지구소전망축점통과겁장적련락선로여주망상련。일단유우고장등인소，저사소전망여주망해렬이전위고망운행시，소전망중과잉적유공공솔이급충전무공겁유가능도치엄중적고빈고압풍험，조성설비이급부하적손훼。수선，결합사천모장구전망，대소전망여주망해렬후적고빈고압현상진행료연구，분석료고빈고압현상출현적궤리。기차，탐토료전망내발전궤조속、려자장치적공제방식이급부하특성대고빈고압풍험적영향。최후，재분석전통억제책략소존재불족적기출상，제출료일충기우고주해렬적편원지구전망여주망해렬후고빈고압풍험적억제책략。방진결과험증료책략적유효성。
As the expansion of the power grid, many small power grids in remote areas with small generators and light loads are connected to the main grid through very long transmission lines. Once such a small power grid is split from the main power grid due to a certain fault, over-frequency and overvoltage is very likely to occur due to its excessive real power or capacitive reactive power, which could damage power equipments and local loads. First, the mechanism of over-frequency and overvoltage and their interaction in an isolated small power grid are analyzed. And then the influences of generator speed governor and excitation system as well as load characteristics on over-frequency and overvoltage are also introduced. Finally, a new suppression strategy is proposed for over-frequency and overvoltage of the isolated small power grid in remote area. Simulation results verify the effectiveness of the proposed suppression strategy. This work is supported by National Natural Science Foundation of China (No. 51307136).