Research On Distribution Network Reactive Compensation System Based On Magnetic Valve Controllable Reactor

Abstract:Electricity is the guarantee of economic development, and our country’s electric system is developing along with high economic growth. In the development process of the electric system, the influence of reactive power is getting bigger. Although reactive power equilibrium of the system can ensure related devices’reliable run and electricity’s stable propagation, its opposite pole will destroy the normal operation and cause big economy losing, so reactive power equilibrium of the system needs to be honored at any time. Now the reactive power compensation is an efficient way to ensure reactive power equilibrium. Reactive compensation requirements are different between transmission network and distribution network. This paper mainly studies the reactive power compensation of distribution network, whose objective is to let the power factor which is below the standard get standardized.The distribution network reactive compensator based on magnetic valve controllable reactor is the most suitable compensator for China to develop in many reactive power compensation equipments. To begin with, this paper analyzes magnetic valve controllable reactor’s working principle, builds electromagnetic equation, derives equivalent circuit, solves control feature and simulates the reactor on Matlab/Simulink. Next, it designs passive filters based on related loads, uses rational interpolation to build the direct relationship between loop current and control angle, makes equivalent substitution for instantaneous power theory, applies symmetrical component method to the compensation of unbalanced load, analyzes relative merits between open-loop control and closed-loop control and builds a closed-loop control system. And then, it derives transfer function with equivalent rule, designs PI controller and sliding mode controller which has also been improved.Because of the limit of the experiment condition, the simulation is carried out with the actual situation. On the basis of a steel plant’s measured data, it sets two loads working at different times. The results show that the reactive compensation system based on magnetic valve controllable reactor is effective, stable and quick, which is conducive to the development of the reactive compensator in our country’s power system.