| With the rapid development of economy, fossil fuels has been unable to meet the growing demand for energy. In the promotion of the world, the use of new energy solar energy has been rapid development, especially the role of distributed photovoltaic power generation system is more and more recognized. The energy storage system, which is widely concerned in recent years, has been widely concerned in the application of new energy sources such as photovoltaic power generation and so on, so the key problem of energy storage system based on distributed photovoltaic power generation system is studied in this paper.First of all, this paper discusses and analyses the storage battery and super capacitor energy system proposed to compensate for a single storage system cannot meet both the power and the energy of the "lithium battery and super capacitor hybrid energy storage system, and has carried on the analysis to the application, and determined to use through a bidirectional DC / DC converter parallel hybrid energy storage structure. In the aspect of capacity allocation, the single lithium battery energy storage system and the super capacitor energy storage system are calculated, and the number, the group and the system of the energy storage element are configured to meet the demand of the subject. According to the overall demand of energy storage system, the simplex algorithm is used to plan the capacity of hybrid energy storage system, the economy is the goal, the energy and power are the constraints, the constraint equations are established and solved. Finally, according to the results of the hybrid energy storage system and the single energy storage system, the conclusion is drawn that the hybrid energy storage system has more advantages.According to the control system of hybrid energy storage, the frequency control strategy of hybrid energy storage system, the power of hybrid energy storage need to stabilize the poor, through the low pass filter design is divided into high frequency and low frequency, high frequency part by the super capacitor to stabilize, low frequency is lithium battery energy storage system and flat, based on small signal model and the transfer function is derived from the DC/DC converter, the design of the current loop and voltage bus to achieve constant pressure control and energy storage system frequency coordination control strategy and Simulation on the Matlab, verify the correctness of the control strategy, in the power level to stabilize under the effect of hybrid energy storage system can effectively reduce the the discharge current of lithium batteries than single storage, prolong the service life of the lithium battery.Finally the design of the hybrid energy storage monitoring system, the design content including from storage to system of energy storage element, a group to the monitored control system composition and structure, the voltage, current and temperature on the important parameter information collection to the analysis, evaluation and treatment, storage management system, alarm and protection function. |
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