张北柔性直流电网变电站能耗装置系统仿真研究

Simulation Study on Energy Consumption Device in Power Substation of Zhangbei Flexible HVDC Power Grid

文中针对张北柔性直流输电工程中可能出现的实际故障类型,结合张北变电站的具体电气参数与结构,建立了包含风机、母线、耗能装置等组件的一套完整的仿真模型。基于仿真模型,文中对孤岛运行方式下张北柔性直流电网换流阀闭锁时换流站耗能装置投切操作对于系统功率与电压的影响开展了研究,验证了耗能装置解决系统功率过剩与电压失衡问题的有效性。针对耗能装置本身在投切过程中可能出现的故障进行了仿真探究,研究了系统功率与电压随故障严重程度的变化趋势,为柔性直流电网耗能装置的故障分析与排除策略提供了理论支撑。

In this paper,based on the actual fault types appearing in Zhangbei flexible HVDC transmission project,combined with the specific electrical parameters and structure of Zhangbei substation,an integral simulation model consisting of wind farms,busbars and energy consumption device is established.Aiming at the problem of Zhangbei flexible HVDC power grid under the isolated island operation circumstance,when the converter valve is locked,the switching operation of the energy consumption device of the converter station is simulated to research the influence of system power surplus and voltage instability,which verifies that the energy consumption device has a great effect on consuming the redundant power and balancing system voltage.And the simulation of the possible failures of the energy consumption device itself during the switching process is also explored,the variation trend of system power and voltage with fault severity under different fault types is studied,which provides theoretical support for fault analysis and troubleshooting strategy of energy dissipation devices in flexible HVDC power grid.