Research On SVG With Harmonic Suppression Function

In recent years,with the applications of China's power industry steady and rapid development of new energy and micro grid,all kinds of power electronic equipments are widely applied to the power system,the grid side will produce a large number of harmonics.There is a large number of reactive power load and variable current equipment in load,which will produce a large number of reactive power,and also have a large number of harmonics,reactive power and harmonic has severely affected the quality of power supply.The problem of harmonic suppression and reactive power has been an important subject in the field of power system and power electronic technology.The current power quality control device is mainly a static var compensator,active power filter and static var generator,but these devices are expensive,static var generator capacity redundancy problem in use,so in order to reduce the cost,improve the capacity utilization rate,convenient maintenance,can consider the transformation of static var generator to take into account the harmonic suppression function,so the focus of this paper is the research of both harmonic suppression function static var generator.In this paper,the research status and development direction of reactive power compensation device at home and abroad are studied,and the characteristics of active filter in hardware topology and control are also discussed.The static var generator can realize the function of harmonic key static reactive power generator to achieve harmonic suppression is to load harmonic current detection,aiming at the limitation of instantaneous reactive power can only be used in three-phase current detection method based on the traditional wire,adopts the method of detecting reactive current instantaneous reactive power based on the power of reactive current and harmonic current detection.When the static var generator considering harmonic suppression function,the output current contains not only reactive component but also harmonic components,because there will be harmonic components of relatively large hysteresis and triangular wave comparison method in the current waveform,the voltage space vector control current harmonic current less common,and then use the the space vector transformation way to deal with the current signal is extracted,by calculating the spatial position to determine the duty time,thus the synthesis of instruction current.In order to improve the control accuracy,the deadbeat and voltage space vector arecombined to achieve real-time and accurate reactive power compensation and harmonic current suppression.Because before this,we need to predict the compensation current,so I chose to predict repeated observation based prediction method of higher accuracy for the current,then predict the current measured,in order to get the voltage signal,and then use the voltage space vector control pulse SVG,SVG compensation the amount of the corresponding compensation grid generation.On the basis of theoretical analysis and calculation,simulation through MATLAB simulation software for harmonics and reactive power compensation and separate compensation of three common situations,that multi function SVG is feasible,the deadbeat space vector control can quickly and accurately for reactive power and harmonic compensation.Finally,the proposed method is validated on an experimental platform based on inverter.The experimental results demonstrate the effectiveness and correctness of the proposed method.