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Study On Control Strategy Of The Building DC Distribution

Posted on:2018-06-22Degree:MasterType:Thesis
Country:ChinaCandidate:J LiuFull Text:PDF
GTID:2322330542461696Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
In recent years,with the rapid development of society and economy,environmental issues are attention,of which photovoltaic,small wind power and other distributed power-based clean energy efficient use of scientific research institutions is the focus of research.But at this stage of the distributed power because of its intermittent strong,low power quality characteristics are not suitable for large-scale centralized into the existing traditional AC power grid,stand-alone form of access to the grid because of high cost,control difficulties and other reasons Limiting its wide range of applications.And as more and more electrical equipment is now based on DC work,communication equipment is becoming increasingly common,people gradually focus on the study of DC micro-network.In order to make full use of the clean energy of city,the building with DC distribution based on distributed power also came into being.This paper constructs a DC distribution based on distributed power access and incorporates a hybrid energy storage system composed of super capacitor and battery to manage its power quality.The main work of this paper includes the following aspects:First of all,The basic framework of building DC distribution network was analyzed:the feasibility of building DC distribution analysis and study to determine the building DC distribution voltage level of 350V/48V double structure,the topology of the ring power distribution,Building DC distribution network through the voltage source converter and 380V AC distribution network for interconnection.Secondly,the photovoltaic array,wind turbine,super capacitor and battery were modeled.Built the photovoltaic power generation system and the maximum power tracking control module.Compared and analyzed the maximum power point tracking control method of the three kinds of common photovoltaic cells.Built the wind turbine,transmission system and permanent magnet synchronous generator module.Analyzed the maximum power tracking control method of wind power generation and built its maximum power tracking control module.Built the Super capacitors and battery module and linked it to the DC micro-network through DC/DC converter.Thirdly,Analyzed the control strategy of super capacitor,battery,photovoltaic array and wind turbine.Including the constant voltage mode of PV array and MPPT mode control principle,MPPT mode control principle of wind turbine,constant current charging and constant voltage charge and discharge control principle of super capacitor,constant current charge and discharge control principle of battery.Built the bi-directional converter module connected AC and DC distribution networks.And the control module of the converter is set up by the vector control method of the grid voltage.The power quality of the DC bus voltage is managed by the improved DC bus voltage control strategy,and the DC bus voltage fluctuation is kept within the normal range.Finally,the simulation parameters are set up on the Matlab/Simulink simulation platform,and the power supply status of the building DC distribution network in the case of grid and island operation is simulated and analyzed respectively.The validity and feasibility of the self-built module and the power quality control Method were verified.
Keywords/Search Tags:building DC distribution, distributed generation, hybrid energy storage system, hierarchical coordination control strategy, MPPT
PDF Full Text Request
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