Control and Grid Synchronization Techniques of a Microgrid For Improved Power Sharing and Power Quality

Abstract

Microgrid, an entity of localised power generation is capable of being connected to newlinethe traditional centralised power grid. India has one of the most robust microgrid markets deployed to fill in for an unreliable utility grid, reach new off-grid customers newlineand reduce carbon emissions. The American, European and Asian microgrid demonstration facilities exist for the testing and verification of various microgrid newlinefeatures. Synchronization of ac microgrids to the power grid facilitates stable, economic newlinesystem operation and delivers power of high quality for the utility requirements. newlineMicrogrids are equipped with controls necessary for managing the operation newlinein islanded or grid connected modes. The critical element in grid synchronization is newlinethe current control strategy meeting the standards for interconnection to the grid. newlineThe grid synchronisation challenge mainly lies in accurately identifying the time newlineinstant so that for a given voltage, frequency and phase of the main grid and that newlineof the microgrid, no circulating current flows in the system. However, the existing newlinemethods lack emphasis on power quality and load sharing capabilities of grid connected newlineconverters. The objective of the research is to develop a highly reliable grid newlinesynchronization technique for a microgrid to achieve power quality, load sharing, newlinestability and smooth transition between islanded and grid connected modes. newlineThe design, simulation and analysis of Communication Assisted Proportional newlineResonant Control (CANAPRC) technique in three-phase grid connected converters newlinehas been implemented. Controller Area Network (CAN) is used as the communication newlinechannel. In the proposed scheme, the grid synchronizing system taps the grid newlinevoltage at high speed and transmits it over the communication network. Simulations newlineare carried out such that simultaneous synchronization of two micro-sources newlineto the ac distribution system is achieved, wherein the phase template of the grid is newlinepassed through the reliable, fast and fault tolerant Controller Area Network.