Design Of100K Var Dynamic Wattless Compensation Device

With China’s power electronics industry and its industry development, the scale of modern power system and technology development speeds up day by day. On one hand, high precision sensitivity of electric power equipment constantly updated, so that users of the grid reliability and power quality requirements are increasingly high, which requires the power grid users received the electric terminal for power system signal processing. On the other hand, the user end of the unbalanced load and flicker load but also makes the power quality the results showed low power factor. Load balance of the whole power system cause bigger loss and unnecessary equipment cost increase, timely in the load is balanced condition, electric motor, electric arc furnace and electric locomotive used. In the power grid users receiving end before joining the reactive power compensation device is necessary is fully embodied, is also the focus of this paper.This article through instantaneous reactive power compensation principle of the power factor is relatively low motor and electric arc furnace electrical equipment with electrical environment simulation. The reactive current compensation, and the unbalanced load voltage caused by the asymmetry.Analysis of negative sequence current causes, and the use of positive sequence and negative sequence and control compensation strategy. And based on the principle of simulation is carried out, focusing on analysis of the compensation principle.This article is based on the three-phase three wire system in power system as the research object of control, inverter with unbalanced load starting output characteristic, proposed the SVG output voltage unbalance suppression method. By the double closed loop and PI regulator with each other, the outer ring and the inner current loop voltage loop are designed. Through the calculation of space position to calculate the duty cycle of the time control of the switching tube turn-on time, the compensation signal to make precise modulation.In the theoretical analysis and calculation on the basis of MATLAB/SIMULINK simulation software.To balance the load and load balance in two cases of simulation design and analysis. Through the simulation results, verify the design algorithm control strategy of enforceability and effectiveness, can achieve the desired effect.