Application Technology Research Of Controllable Reactor In UHV System

It's the inevitable trend of development of EHV and UHV. Safe and stable operation of power grid and a higher power quality requirement are needed. Reactive power compensation and reactive power balance in power system, can improve the transmission system stability, improving transmission capacity, system over-voltage suppression. With the increasing complexity of network structure and increasing the voltage level, voltage and reactive power regulation rely solely on traditional non-controllable reactor can not meet the actual demand of compensation device. According to the current situation and development of power industry, the development and application of new reactive power compensation equipment in the current power system in our country is the key technology needed to be solved.Magnetic controllable shunt reactor (MCSR) is one important device in voltage controlling and reactive power compensation, it attracts more attention and applies in many fields. It can adjust the capability of itself automatically and smoothly along with the change of the transmission power. Moreover, when the line transmits large power, once the transient state process happens, it also can increase the capability rapidly and present deep strong compensation. That is to say, it has the function of reducing power frequency and operational over-voltage.At first, MCSR is studied both in theory and simulation in the thesis. The review of MCSR is introduced. Principle of MCSR is analyzed. Mathematical model is set up. And on this basis conclude its simulation model and controlling characteristics.Secondly, the Sanyou-Jiangling EHV transmission line is simulated. The impact of MCSR to the transmission line and the on the inhibitory effect of power frequency over-voltage for high voltage transmission system is analyzed and laid the foundation for the use of MCSR. It lays a foundation for UHV transmission system with MCSR.Again, the voltage control system of controllable reactor is studied. The UHV power system is modeling and simulation on the base of study of EHV power system. The Finally, combined a 1100kV substation in the country, VFTO is calculated on thansformer during inhibition effect of over-voltage obtained by MCSR in the system is very obvious. And dynamic reactive compensation effect by the MCSR of system is simulated.Finally, MCSR response time is too long, and the response time needs to be shorten to meet rapid excitation. Several ways to improve response speed is discussed and the simulation is conducted.