Adjustment of Active and Reactive Power of Synchronous Generator in Grid-connected Operation

Abstract

The regulation of active power and reactive power of generators in grid-connected operation has always been an important research issue of power plants and power grids for efficient use of energy and stable operation of motors. In daily life, residential electricity consumption is always changing, more at night and less during the day; more in summer and winter, less in spring and autumn, so in order to make rational use of resources and improve the economy, real-time monitoring and regulation of active power are needed. And most of the loads connected to the grid are inductance loads, so a power system should load a lot of reactive power besides active power. According to statistics, the reactive power required by an asynchronous motor in a power system accounts for 70% of the total reactive power supplied by the power grid, 20% of transformers and 10% of other equipment. The reactive power supplied by power grid is shared by all generators, which will bring about the problem of how much each generator should bear and how to regulate the reactive power of generators. In this paper, the regulation methods of active and reactive power, the regulation range, the power angle characteristics and the electromagnetic relationship of active and reactive power are analyzed in detail.