发电厂主变分接头调整对发电机电压及无功的影响

Influence of Main Transformer Tap Adjustment on Generator Voltage and Reactive Power in Power Plant

由于河北南部电网电压偏高,深能保定发电有限公司新建机组并网发电后无功出力受限,机组对电网的调压能力没有完全释放,而发电厂主变分接头位置的调整对电网的电压及发电机机端电压有一定的调整作用.经过调研分析,通过对发电厂主变分接头位置进行调整,有效改变了发电机及厂用电源电压,进一步提升了机组进相能力.通过发电机进相运行可以有效改善电网无功潮流分布,对调节系统电压、提高电压质量具有明显作用.

Due to the high voltage in the Southern Hebei Power Grid,the reactive power output of new units in our plant is limited after grid connected power generation,and the voltage regulating capacity of units to the power grid is not fully released.The adjustment of the tap position of the main transformer in the power plant can adjust the voltage of the power grid and the generator terminal.Therefore,through investigation and analysis,we can effectively change the voltage of generator and auxiliary power supply by adjusting the tap position of main transformer in the power plant,further improve the phase leading ability of the unit.Through the phase leading operation of the generator,we can effectively improve the distribution of reactive power flow in the power grid,and play a significant role in regulating the system voltage and improving the voltage quality.