| In modern technology has made leaps and bounds,especially under a lot of popularity in the context of power electronics technology,power equipment,non-linear loads can be widely applied which greatly improving productivity,but also causing the distribution network to face more and more serious problems.Especially in the current imbalance and harmonic pollution performance is more prominent,Seriously reduce the current quality.In response to this phenomenon,we propose a passive current quality of the integrated processor-based distribution network.The passive current quality comprehensive treatment device is designed to solve the problems of three-phase current imbalance and harmonic pollution.This article first proposes the topological structure of the "passive" current quality comprehensive treatment device based on the three-phase four-wire system for the distribution network.,It is composed of two parts: current unbalance compensator and passive filter.Through the theoretical analysis of the current unbalance compensator,its working principle is introduced,and the mathematical expression of the current unbalance compensation admittance is derived,and the relationship between it and the firing angle of the thyristor is established.Aiming at the problem of harmonic pollution,a new type of passive filtering structure for multiple harmonics is proposed,and its working principle and parameter design are derived and explained.Secondly,this article uses the ip-iq current detection algorithm based on instantaneous reactive power.In order to meet the requirements of three-phase four-wire system measurement and solve the problem of voltage asymmetry,it has been improved.By combining the positive sequence component of the fundamental wave with the deviation angle,a synchronous signal is obtained and the voltage asymmetry is reduced.The resulting detection error can effectively detect the fundamental and harmonic components of the current.Combining the designed goals,configure the parameters of the passive current quality comprehensive management device,and use Simulink to simulate and analyze the passive filter structure,current detection algorithm,and the complete set of passive current quality comprehensive management device,and get its characteristics And verify its validityFinally,the hardware circuit design with DSP as the control core was given,and a verification platform was built under laboratory conditions.The three-phase unbalance of the system was successfully reduced to 1.4%,the harmonic content was reduced to 3.1%,and the power factor was improved.It is 0.99,which meets the requirements of current quality and verifies the working ability of the passive current quality comprehensive treatment device. |
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