The Theory And Application Of Novel Controlled Reactor In Long AC Transmission Line

Developing long distance power supply is the certain trend of our country's electric power industry, it have bring forward more high request for the safety and stabilization running and electrical energy quality of the network. Because of large capacitive charging of long AC transmission line, capacitance reaction of no loaded line will cause severe overvoltage. Reactive compensation could improve the stabilization of the transmission system, increase the transmission ability, and restrain the overvoltage of the system. In order to limit overoltage and compensate charging powers, it is required to install compensation device.The magnetic valve controlled reactor is a novel flexible AC transmission control device, and it's a special extra-high or ultra-high voltage shunted reactor. It has an approximate linear A-V characteristic, less harmonics and relative less response time. It can change its compensation power smoothly. Then it can solve the contradictions between the limiting overvoltage and reactive power compensation. So it's the first device in the area of voltage regulation and reactive power compensation.This paper first briefly analyzed the necessity of using long distance long distance power transmission system, expounded it's situation and the situation of the controlled reactor researching and applicating at home and abroad. The basic theories of the controlled reactor were analyzed, and the mathematical model, physical model and equal circuit equations were got, the basic characters of controlled reactor are analyzed. Then it build the long transmission line model, in the basis, study the basic theories of overvoltage in long line, then analyzed it's adjusting using controlled reactor in detail. And used PSCAD/EMTDC to process building model and simulation. It derived a control trategy for the reactive power in long line, then designed a active reactive power compensation device, and used Matlab/Simulink to process building model and simulation. Then it introduced the producing, composition and the calculation of the secondary arc current, and put forward to a method of suppressing the secondary arc current of the single and double-circuit lines. In addition, it derived the formulation for the midpoint reactor. At last, it calculated and analyzed the suppressing of secondary arc current using the controlled reactor.