偏远地区小电网与主网解列后高频高压风险及抑制策略

发布时间：2018-05-20 01:24

本文选题：高频 + 过电压　；参考：《电力系统保护与控制》2015年01期

【摘要】：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。
[Abstract]:With the construction of power free area power grid, a large number of small power grids with small units and light load characteristics are gradually connected to the main network through extremely long contact lines. Once these small power grids are decomposed from the main network into isolated networks due to the failure and other factors, the excess active power and charging reactive power in the small power grids may lead to serious high frequency and high voltage risks, resulting in equipment and load damage. Firstly, the phenomenon of high frequency and high voltage in small power grid and main network is studied, and the mechanism of high frequency and high voltage phenomenon is analyzed. Secondly, the influence of generator speed regulation, excitation device control mode and load characteristics on high frequency and high voltage risk is discussed. Finally, based on the analysis of the shortcomings of the traditional suppression strategy, a high frequency and high voltage risk suppression strategy based on the high cycle sequence is proposed for the remote area power network and the main network. Simulation results verify the effectiveness of the strategy.
【作者单位】：国网四川省电力公司电力科学研究院;西安交通大学;
【基金】：国家自然科学基金项目(51307136)~~
【分类号】：TM727

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