Automatic Control Strategy And System Design Of Substation Voltage And Reactive Power

Voltage is an very important index to weigh the quality of electric energy in power system, which is not only in relation to the safety of power system but also millions of consumers. One of the most important requirements of power system is to ensure the stability of the bus voltage level, and reactive power compensation is an effective means to ensure the stability of voltage. Currently, comprehensive control of reactive power voltage is mainly based on substations. In this study, we did research in reactive power voltage control and its system software design for given substation, some study results have been achieved as following:1. Based on the analysis of various basic principle of reactive power compensating device and regulation voltage, we analyzed the problems of existence of 9 subregion reactive power/voltage control,which was widely used in our country's substation,and mainly studied its control strategy, and use a modified 17 subregion reactive power/voltage control was proposed. The propoed control strategy can divide out the critical region which is easy to produce turbulence, and take the individually control strategy, it effectively prevented the happen of oscillation.2. Taking the power system in Dongli district of Tianjin as an example, we applied the improved method of reactive power/voltage control in substations and designed and developed the software system of reactive power/voltage contro(lVQC). This software system can largely reduce the turbulence phenomenon and the effectiveness of the VQC software was verified in Dongli district, and the level of voltage met the standard of the company.Finally we get the satisfying application effects.