Harmonic Analysis And Suppression For Power System Of Ship

The Harmonic Analysis and Suppression for Power System of ship were studied in this paper.In recent years,there are more and more harmonic pollution in Power System of Marine due to the widespread application of nonlinear electronic equipments to ship,which impact on the security and economy of operation of ship.The harmonic will not only cause the danger of collapse of electric network but also disturb the communication system,navigation system and rescue equipments for shipwreck.Right now,shipbuilding and maritime industry of our country has achieved rapid development,the harmonic control will be a problem which cannot be ignored.So the research of harmonic analysis and suppression of ship has very far-reaching significance for the ship of our country safe and economical operation.Artificial neural network is widely used in power system harmonic analysis.This article selects the BP neural network to analyze harmonic,considering the disadvantages of BP network and the insufficiency,to improve the BP network.The FFT and the improved BP network effective combination can be more effective for harmonic real-time analysis,the method is to first preprocessing of the sampled signal FFT algorithm that can get harmonic and harmonic frequency;Then according to the number of the harmonic to determine the number of neurons in by harmonic frequency of setting up the initial value of neural network parameter iteration,Finally,the improved neural network training,can realize precise harmonic analysis.Through the analysis of the BP algorithm is proposed in this paper,the algorithm can effectively improve the accuracy of harmonic analysis,but also achieve the goal of the real-time performance is improved.Secondly,for the classification of the active power filter and topological structure has carried on the detailed elaboration,analyzed the structure composition and basic working principle of active power filter.Study the existing harmonic current detection algorithm,in view of the traditional detection algorithm based on instantaneous reactive power theory between accuracy and speed of defect,is proposed based on adaptive filter theory of instantaneous reactive power detection algorithm,realize high precision detecting harmonic current at the same time also has faster dynamic response.Finally,using the Matlab simulation research for shunt active power filter,for each part of the modeling of active power filter.In the case of symmetrical and asymmetrical three-phase power grid simulation respectively,the BP algorithm proposed in this paper is verified and the shunt active power filter designed correctness and effectiveness.