| At present,a large number of harmonic seriously affect the quality of power grid voltage,large number of electric vehicle charging equipment to produce a large amount of harmonic current seriously affect the power quality,equipment safety and economic efficiency,electricity traditional harmonic governance device can’t meet the needs of varying load harmonic governance,active power filter as an effective harmonic current control device,load control with variable load effect is obvious,the purpose of this article is the study of electric vehicle charging stations for harmonic suppression.Harmonic suppression device were in traduced in this paper the development and current situation of the development of both at home and abroad,analyzes the principle of active power filter and established the math model,based on the instantaneous active power theory,studied under a given frequency without low pass filter harmonic current extraction method,under the power frequency,this method does not rely on low pass filter can shorten the time delay caused by the harmonic detection of Based on the principle of active filtering,the tracking control strategy of harmonic compensation current generation is studied.Based on the traditional PID control method,the fuzzy PID control method is proposed to control the DC side voltage control of active power filter.The principle of electric car charging device and battery is analyzed,and its topological structure is simplified and the mathematical model is constructed.Simulink simulation software is used to simulate and analyze the system under constant load and variable load respectively.The results confirm the reliability of dynamic suppression of the system. |
