Research On The Technology Of Harmonic Suppression In Ship Power System

Marine shipping industry as a symbol of the strength of a country, its achievements in recent years is excited. And with the continuous improvement of technology, basic said goodbye to the previous era of artificialization, shipping industry ushered in the era of full automatic. In the automation level and at the same time, also brought some additional problems. For example, some nonlinear characteristics of power electronic devices are widely used in the ship power system. When using these types of equipment will produce a large number of harmonic pollution in power grid. Aiming at this problem, analysis of the current common filtering scheme, and on this basis, the key to design a kind of active power filter based on fuzzy sliding mode control algorithm. Through in the MATLAB/Simulink software has carried on the related experiment. According to the experimental results can be seen that achieved good effect in harmonic suppression.In this paper, the analysis, design and verification of the above points of view will be divided into five parts, each part is a single chapter, the contents of each chapter is summarized as follows:(1) In the first chapter mainly introduces the background and significance of the topic,the development of related technologies at domestic and foreign, as well as the research objectives and content of the paper.(2) The second chapter first to carry out specific analysis on composition and structure of the ship power system. Secondly this paper expounds the definition of harmonic and related parameters, on the basis of the ship power system are emphatically analyzed the reason and the harm of harmonics, finally analyzes the different harmonic governance standards.(3) The third chapter first analyzes the general not working principle of controllable power switch bridge type circuit, on the basis of the design through phase-shifting transformer winding connection 20 ° series triple 18 rectifier pulse circuit and phase-shift15 ° 24 rectifier pulse circuit in series four heavy chemical composition.(4) The fourth chapter firstly designed a common structure of single-tuned passive filter and high-pass filter. Secondly this paper is to analyze and design a kind of parallel active power filter. It mainly divided into harmonic current in the design of accurate detection and compensation current real-time control two parts. The harmonic current detection using a current based on instantaneous reactive power theory test. On the compensation current control algorithm is a fuzzy sliding mode control algorithm is designed. As the main body in sliding mode algorithm, the fuzzy control in the switch control, to decrease the impact the chattering of sliding mode algorithm.(5) The fifth chapter first describes the experiment software, experimental environment,test parameters, and the simulation of ship power system modeling. On the basis of the active harmonic suppression scheme model is established and passive harmonic suppression scheme model, through the correlation analysis method, to verify the feasibility of the designed filter scheme. According to the actual situation, choice of plan has made the concrete analysis.