Study Of Static Var Generator

Increasingly widespread application of electronic devices, power system harmonic pollution problems are more serious, seriously affecting the quality of power supply. Therefore Harmonics and reactive power problems on the power system and power users are very important issues, harmonic suppression and reactive power compensation has become a power electronics and power systems and other fields face a major issue, the more cause for and more and more attention and become the focus of attention in recent years, one of the aspects. Static var compensator using dynamic compensation of reactive power is the power electronics discipline of the more active research areas, with its smooth reactive power regulation and fast dynamic performance, and other fine performance attracted domestic and foreign scientific and engineering areas of concern. It's reactive current output voltage variations in a large range of constant low voltage reactive power can still provide strong support, and compatibility from the emotional to the full range of continuous adjustment, making it the equivalent of reactive power output SVC with the capacity of 1.4 to 20 times.This article first analyzes the superiority of SVG. According to SVG works, discusses its compensation performance. Describes the instantaneous reactive power theory and its application in reactive power control and reactive power detection applications. Active filter for the needs of the actual project is proposed based on instantaneous reactive power to the Theory of harmonic and fundamental reactive current detection method, which simplifies the complex mathematical transformations, can be directly applied to three-phase three-wire, three phase four-wire and single-phase system harmonics and fundamental reactive current detection. Secondly, the paper analyzes the current indirect control and direct control of the typical current control method, compared the advantages and disadvantages of these types of control methods. This article focuses on the current indirect control of the fuzzy PI control of a detailed study, design for power system reactive power compensation SVG fuzzy PI controller, a combination of PI control and the advantages of fuzzy control to contain stand-alone SVG infinite bus system as the research object, the fuzzy PI control of power system transient simulation show that fuzzy PI controller in the system is running a large space to play better on both static var generator compensation effect.