Research On Network Control Technology Of Solar Micro-grids And Municipal Electricity

With the increasing depletion of coal, oil, natural gas and environmental pollutionis becoming serious, we must use large scale development and utilization of solar andother renewable clean energy. However, along with the traditional promotioncountercurrent grid-connected mode, more and more large-scale, distributed powercapacity access to the power system, the traditional passive distribution networks intothe structure of the active network, the direction of the trend will also be undergoing afundamental change. These changes seriously affect the safe operation of thedistribution network. Early2013in parts of the grid company already allows familiesphotovoltaic grid, but the country has not yet introduced relevant documents to solvethe problem of grid tariffs. Therefore，can countercurrent grid has become a bottleneckin the development of photovoltaic power generation, hindered the use of solar andother new energy sources.The countercurrent grid solar micro-grids no opened up a new way of thinking tothe use of solar energy. This power does not require batteries and other energy storagedevices, not only to avoid the batteries pollute the environment, and low conversionefficiency, and can ensure that the photovoltaic power generation" electricity was usedImmediately, used on the spot", to guarantee solar issued energy priority supply, themunicipal grid electricity as a supplement application this application does not changethe distribution network structure and the direction of the trend, micro-gridsphotovoltaic power generation and load management, elimination of photovoltaic gridtraditional grid, to promote the use of new energy prospects. Combined with this feature,in this paper, a countercurrent running solar micro-grids and municipal powerinterconnection control system topology and operation of networked control systems,control strategies and the key technology for the in-depth study.This paper describes the current domestic and international solar micro-grid accesswith grid operation research, referring to Chinese National Standardization ManagementCommittee issued “Photovoltaic system and network technical requirements”, thecontrol strategy of three micro-power micro-grids solar power generate a comparativeanalysis, proposed technical standard solar micro-grids and municipal electricity network running. Learned a main circuit of the control system through the introductionof the overall structure of the network control system, including a DC boost circuit, theinverter circuit, the backflow prevention control circuit and an output filter circuit; thecontrol circuit of the network control system including the master unit, the sampledetection circuit the external drive circuit, serial communication circuit, power supplycircuit and digital-to-analog AD converter circuit, not only to ensure the maximumoutput of the photovoltaic power generation, and the emergence of free inverse power.In this paper, the three-phase inverter circuit simulation using MATLAB softwarewritten program is able to draw the three-phase AC waveform, when sudden loadchanges, the system can quickly coordinate their respective power output, to ensure thatthe work load reliability and stability.