解列后局部孤网的自适应第三道防线配置方法

发布时间：2018-08-20 17:23

【摘要】：通过薄弱交流断面与主网相连的局部电网在断面解列后转为孤网运行时,容易出现频率稳定或电压稳定破坏问题。以某实际局部电网发生的一起全停事故分析了现有低频低压切负荷和过频切机配置方法的不足,提出一种适用于解列后局部孤网的低频低压切负荷和过频切机配置方案,以改善第三道防线对孤立电网运行方式或电网规模变化的适应性。其主要思路是将低频低压切负荷及过频切机方案分为速动区和补偿区,前者用于快速平抑不平衡功率冲击,避免频率或电压大幅偏移;后者用于避免频率或电压快速变化时,低频低压切负荷或过频切机多轮次相继动作导致过控。基于实际电网的仿真结果验证了所述方法的有效性。
[Abstract]:The local power network connected with the main network through weak AC section is prone to frequency stability or voltage stability when it is switched to the isolated network after the section has been disconnected. Based on a full stop accident in an actual local power network, this paper analyzes the shortcomings of the existing low-frequency low-voltage shedding load and over-frequency cutting machine configuration methods, and puts forward a low-frequency low-voltage shearing load and over-frequency-cutting machine configuration scheme suitable for the local isolated network after decomposing. In order to improve the third line of defense to the isolated grid operation mode or network size change adaptability. The main idea is to divide the low-frequency low-voltage shearing load and over-frequency cutting machine into quick moving area and compensation area. The former is used to quickly suppress unbalanced power impulse and to avoid large deviation of frequency or voltage, while the latter is used to avoid rapid change of frequency or voltage. Low-frequency low-voltage shedding load or over-frequency cutting machine multiple successive actions lead to overcontrol. The simulation results based on the actual power grid verify the effectiveness of the proposed method.
【作者单位】：南瑞集团公司(国网电力科学研究院);国电南瑞科技股份有限公司;国网山西省电力公司电力科学研究院;
【基金】：国家电网公司科技项目“大电网严重故障下多稳定形态交互影响分析及控制技术研究”~~
【分类号】：TM712;TM732

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