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Energy Real-time Scheduling For Microgrid

Posted on:2016-06-12Degree:MasterType:Thesis
Country:ChinaCandidate:X HanFull Text:PDF
GTID:2382330470974981Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
In the operation period of microgrid,duing to renewable energy power generation output is affected by environmental factors,the output power has fluctuation,short-term generation forecast and load forecast also exist errors,resulting in recent planning might be inconsistent with the actual operation situation,in some large power system fault,or in a remote ranch,frontier defense,islands and other special occasions,because there is no large power grid,microgrid is only in the independent operation,And renewable energy power generation(such as wind power,photovoltaic power generation etc.)occupy a certain proportion,influenced by the natural environment,their power output has fluctuation,and the load power fluctuations,there are certain instantaneous power,namely the power waste and the power shortage of two kinds of unbalanced power.This requires real-time scheduling of the microgrid in the grid connected and isolated network operation mode.In this paper,the main work is as follows:1?A pratical real-time scheduling strategy for microgrid in grid connected operation is put forward,considering the influence factors of the battery lfe and the battery's constraints.The optimal load distribution model is included in the strategy to arrange the output of the controllable micropower,it can optimize microgrid operation cost and contribute to cutting a peak to fill valley.2?The effectiveness of the strategy is verified through comparison with battery alternating charge and discharge,cut a peak to fill valley,the recent planning results excluding and including the battery depreciation cost in a small microgrid system containing the thin film fixed type photovoltaic power generation,wind power generation,microturbine and lead-acid battery.3?In the independent operation mode,load transfer model,which contains two index of load curve smoothness and load transfer cost,is established to smooth the load curve by transfer part transferable load.During the operation of microgrid,the real-time scheduling strategy based on battery three-section charging and discharging is implemented to arrange each controllable micropower and battery output,which can keep battery charging and discharging margin enough and make full use of battery to cut down the power shortage and power waste.4?Take a small microgrid system as an example,through comparison with the recent planning results excluding the battery depreciation cost,the unbalanced power can be slashed under the role of load transfer and the real-time scheduling strategy.
Keywords/Search Tags:microgrid, real-time scheduling, grid connected operation, alone operation, optimal load distribution, battery constraints, battery life, load transfer, three-section, the unbalanced power
PDF Full Text Request
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