The Characteristics Of The Direct Voltage SVC

With the continuous development of the grid, power system operation flexibility and security has kept rising. Power system reactive power demand increases when the reactive power compensation can not be timely, it could lead to big power system blackout. The static var compensator (SVC) is the device which is not the lead. lag limit, short response time and quick adjusting reactive power. Used the static var compensator (SVC) control system to provide dynamic reactive power compensation is the most effective and widely used measures, it has an extremely important meaning security and stability of the grid operation.This detailed analysis and comparison of the current reactive power compensation device characteristics of the reactive power compensation principle of the location of constant volume, the characteristics of the four control strategies are analyzed and compared here. A new type of static var compensator. Direct Voltage SVC, detailed analysis of static characteristics of the direct voltage SVC, combined with the classic single. dynamic load model, using voltage stability toolbox (VST) to study its bifurcation point. The results show that the direct voltage SVC can support more reactive power when short circuit fault occurred in the system, the system voltage dropped significantly which needs more reactive power. Through the single-dynamic load model dynamic reactive power compensation device can change the original system bifurcation point, increase the load limits and improve the system voltage stability.