Electric Energy Management Research Of Micro-grid Based On Nonintrusive Load Monitoring

With the rapid development of the global economy, energy and environmental issueshave become increasingly prominent, electricity is one of the important forms ofconsumption, the researchers advocate the development of new energy direction to relievethe energy shortage and environmental pollution, so renewable energy generationtechnologies micro-grid system will be the future development trend, however, howreasonably distribute micro-power load management, to meet the requirement powerquality, is one of the important techniques in research on micro-grid.In this paper, micro-grid and grid are in the network operation mode, to study themicro-power electric energy management. In the domestic and foreign scholars on thebasis of the study, through analysis of the structure of the micro-grid, in the process ofswitching load will produce a unique changes in the electrical signal, the use ofnonintrusive load monitoring methods, can realize the type of load recognition. Based onfuzzy C means clustering algorithm pattern recognition method, processing the parametersof load itself, identifying the type of load combined with closed to the degree method,because the limitations of monitoring methods are not suitable for certain types of load,such as nonlinear load. Based on instantaneous reactive power theory, the extraction ofharmonic current detection theory is applied to the information of the load, given based onthe load the harmonic characteristics of nonintrusive load monitoring method. When theload inputs, its fundamental component is detected, then extracted the representative ofharmonic current as the feature of load type, with unit of time harmonic of the area as aload type of discriminant conditions, it can identify a variety of load types.In the electric energy management of micro-grid, and the use of above loadmonitoring method, in a single micro-power or more micro-powers supply, through thesimulation analysis shows that the type of load can be accurately identified, according toenergy compensation on spot and run the network loss of the minimum principle, to adjustthe output power of the micro-power, to meet the energy demand of the load, achievingreasonable distribution of energy.