清洁能源并网下多电源联合运行的策略研究

Research on strategies of multi-power joint operation generators with clean energy connected to transmission network

随着送端电网清洁能源并网容量和直流线路的不断增加,加剧了电网故障后并网的清洁电源发生大规模无序脱网的现象。文章结合送端电网不同电源的特性,定义了送端电网清洁电源脱网容量的目标函数和约束条件,设定了不同的电源基地运行条件和不同的保护参数下的脱网容量期望区间,形成了多电源联合运行的协调策略。通过对某大区电网进行仿真分析,结果表明增大清洁电源附近常规电源的出力能够缓解在电网故障瞬间清洁电源的高压脱网现象,得出了在严重故障下安控切机措施和风电高电压穿越保护相配合的方案能够有效降低清洁电源的脱网容量。

With the increasing grid-connected capacity and DC line of clean energy supply to the grid,the phenomenon of large-scale disordered off-grid of clean power connected to the grid after grid faults is aggravated.In this paper,based on the characteristics of different power supplies in the transmission network,the objective function and constraints of the off-grid capacity of the clean power supply of the power supply network are firstly defined,and then,the operating conditions of the power supply base and the expected interval of the off-network capacity under different protection parameters are set.The coordination strategy of multi-power supply joint operation is formed.Finally,the simulation analysis of a large-area power grid shows that increasing the output of the conventional power supply near the clean power supply can alleviate the high-voltage off-grid phenomenon of cleaning the power supply in the event of grid fault.The solution of the safety control cutting machine and the high voltage traversing protection of the wind power under severe faults can effectively reduce the off-grid capacity of the clean power supply.