| The output of wind power generation has fluctuations, which can easy cause the waving of voltage and frequency. The super capacitor and battery can be used on the flow optimization and control of wind power generation system, which will improve the stability and quality of system significantly.Based on the output characteristic of wind power generation system, the paper analyzed the energy flow of wind power, and proposed the general idea and basic strategy of energy maneuver control what based on the bi-directional DC-DC converter in the hybrid energy storage system, and then take the bi-directional DC-DC converter as the important research object.In order to satisfy the high-power of system and ease the parallel pressure of battery, the topology structure of triple bi-directional DC-DC converter is determined. In the meanwhile the working principle of converter is given and established the small signal mathematical model by state-space averaging method, designed double closed-loop control which based on voltage and current to achieve energy control and distribution of energy storage system.Taking TMS320LF2407 as control core, designed digital control circuit, to realize electricity sampling, double closed-loop control, the PWM signal output, over-voltage and over-current protection.Simulated by matlab, a small power prototype for experiment is applied, simulation and experiment results show that triple bi-directional converter can effectively achieve energy distribution between energy storage components in the optimal control of wind power system.The work can provide theoretical guidance and technical support for improving the output performance of wind power system by energy storage technology. |
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