The Application And Research Of Hybrid Storage Energy System In Power System

As environmental pollution and energy shortage problem increasingly highlight,vigorously develop renewable clean energy is a new optimization primary energy structure in our country,low carbon,environmental protection,economy development,the important measures for electricity generation by using renewable new energy become the strategic choice of all countries and regions.At present,can be used to generate power renewable new energy application is most wind power and photovoltaic power generation.But wind power,photovoltaic power generation system of electricity is intermittent and randomness and an accurate prediction,and changes over time,climate and season,leading to new energy power generation system output power fluctuation is bigger,cannot be stable electric power production.With scenery power generation in the proportion of power grid is more and more big,the scenery is generated output fluctuations can cause the volatility of the grid voltage and frequency,to power grid security and stability,caused enormous influence power quality and reliability.The micro grid can effectively improve these problems.Energy storage technology is an important part of in micro,it can be a smooth new micro source output volatility,storage and backup power and fill peak clipping etc.Paper first analyzes the lithium iron phosphate batteries and super capacitor characteristics and model research.Through comparing all kinds of the performance of lithium-ion batteries,lithium iron phosphate battery advantage;Through analysis and comparison of the existing lithium battery equivalent circuit model,using PNGV model for lithium battery modeling;Secondly analyze the super-capacitor characteristics and its equivalent model to do the research.Concluded the characteristics of super capacitor and equivalent circuit model,in order to study conveniently select the RC series model is relatively simple modeling.Secondly,respectively for lithium batteries and hybrid energy storage capacity and power allocation method made a deep analysis and research.First through summarizing and analyzing previous method of optimal configuration of battery and limitations,the deficiency of the research on lithium battery capacity configuration method to give;Then based on the capacity of the lithium battery hybrid energy storage capacity matching method is studied,according to the characteristics of the hybrid super-capacitors and batteries complementarity,the rational allocation of capacity than through an example.Finally,the control strategy of hybrid energy storage system and inverter control to do the research.If the battery and super capacitor energy storage were analyzed deeply the inverter control strategy,on this basis to realize the hybrid energy storage relative to a single lithium-ion battery energy storage to significantly improve the stability of the bus.Then,in view of the droop control in micro source and the load change causes the load voltage and frequency offset the defects of rating,this paper proposes a drooping inverter power supply control method,through the appropriate droop control,ensure the stable operation of the micro grid is realized.