| The increasing demand for energy has promoted the rapid development of distributed energy power generation.Among various distributed power generation technologies,photovoltaic power generation has attracted much attention in its advantages of clean,pollution-free and widely distributed,and is widely distributed in power systems.Due to the long service life,high conversion efficiency,clean and environmental protection,the energy storage of the flywheel is increasingly valued by researchers at home and abroad.In order to meet the requirements of large-capacity energy storage,a plurality of flywheel units are connected in parallel to form a flywheel energy storage array.Aiming at the defects of randomness and volatility of photovoltaic power generation,the Flywheel energy storage array system is applied to smooth the output power fluctuation of photovoltaic,and the photovoltaic-flywheel combined power generation system is constructed.This paper focuses on the power allocation of each unit in the flywheel energy storage array,and has carried out research from the following aspects:Firstly,the working principle and system structure of flywheel energy storage system are expounded.Comparing the implementation schemes of two flywheel energy storage array systems with AC bus parallel and DC bus parallel,in this paper,the topological structure of DC bus parallel is adopted.The characteristics of photovoltaic power generation system and the topology of photovoltaic-flywheel combined power generation system are briefly introduced.The control modes of flywheel unit under different operating conditions are analyzed.Secondly,Aiming at the operation control of each flywheel unit in Flywheel energy storage array system,two different power distribution strategies are proposed.The first one is the power allocation strategy based on the consistency algorithm,The algorithm aims at the ratio of the storage or release power of each flywheel energy storage unit to the charge/discharge margin ratio of each unit.In each charge and discharge cycle,the charge-discharge proportional coefficient of each unit is iteratively solved,and the reference power of each unit is obtained,and the maximum chargedischarge power constraint of each unit is added,thereby effectively preventing overcharge and over-discharge.The second is an improved flower pollination algorithm,which accelerates the convergence speed and optimization accuracy of the algorithm,and distributes the power distribution of a flywheel unit on the basis of meetting the power scheduling instruction with the minimum flywheel loss power as the target.Finally,the model of Flywheel energy storage array system is built by Matlab/simulink,and two power distribution strategies are simulated and verified,and the simulation results show that both of the two strategies can realize the reasonable distribution of power instruction,and the flywheel energy storage array can perform the scheduling task well according to the power command. |
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