Study And Application Of Voltage And Reactive Power Control Strategy On 500kV Mengshan Substation

The 500 kV Mengshan substation is one of the main auxiliary projects of the Three Gorges project in the west of Jiangxi province, and also the key link of the Three Gorges power transmission and transformation of Jiangxi three line 2 station project. As a key substation between the Central China Grid and the Jiangxi Province Grid, it connects directly the Three Gorges Grid. Substations play an important role in the electric power transmission project. They both transmit active power and reactive power. The voltage level of a substation is an important symbol of whether the substation is in normal operation and whether the quality of electric energy is good. However, the voltage level of a substation directly depends on whether the reactive power is enough, and whether the reactive sources allocation and the reactive current distribution is reasonable etc. So, in order to guarantee the normal operation of substations and provide high voltage quality, it is necessary to formulate reasonable voltage and reactive power control strategy.This thesis analyzes the basic knowledge of voltage and reactive power control strategy firstly, obtains the mutual restriction relation between voltage and reactive power by using theoretical derivation and studying the fundamental of the voltage and reactive power control strategy. Then the voltage and reactive power control strategy based on five-area control method and its elaborate the action principle is investigated in detail, and the five boundaries are determined by using geometric method and the improved approach to make it more truthful is proposed. Thirdly,the voltage and reactive power control strategy on the 500 kV Mengshan substation using five control plans is simulated, and the effectiveness of this strategy is verified. Finally, the embedded integration of the strategy and the D5000 system is discussed in detail, the data interaction, man-machine interface, main function and the expected effect of the embedded integrated system are fully analyzed.