| With the global energy and environmental problems becoming increasingly serious,the use of renewable energy for power generation has become an important issue for all countries to achieve sustainable development planning.The storage battery has excellent dynamic performance,It can not only play a peak Pinggu,smooth load power,but also be adjusted according to different time,so it is very suitable for solving strong randomness and fluctuation of renewable energy generation problem.The liquid flow cell stack group and the operation and management is different from the lithium battery,The liquid flow cell’s focus is not the internal balance of the battery control,but rather the flow battery positive and negative electrolyte’s control of the pressure.The problem which should be resolved first is the problem of low-voltage,high-current and current sharing for the flow battery in the step-up conversion and the control of charge and discharge.This paper chooses 200 KW flow battery energy management system as the research object,the two-way DC/DC power conversion subsystem topology BUCK and BOOST two mode switching converter and the control strategy of key technology are studied,The design of bidirectional DC / DC power converter based on DSPTMS320F28335 200 KW flow battery energy storage system is completed.First of all,according to the requirements of the project,the topology of six way interleaved parallel bidirectional DC/DC converter is designed and its working principle is analyzed.The output voltage and current of bidirectional DC / DC converters with multi-stage interleaved parallel technology are analyzed and proved theoretically that the multi-stage interleaving technique has the advantages of improving the output voltage ripple and output current ripple.Secondly,according to the principle of the converter,the control algorithm of the intelligent control of the flow battery bidirectional DC/DC converter is proposed.For the six way interleaved bi-directional DC/DC converter using double closed-loop control strategy based on branch current do for current loop,and the simulation result shows that the control method which is proposed has the advantages of high response speed and good flow effect.Finally,according to the parameter requirements of the system,the switch tube of the bidirectional DC/DC converter is selected and the inductance and capacitance are calculated.On the basis of the principle,parameters and control strategy of the converter,the software and hardware design of the energy management system is carried out.An experimental prototype of 200 KW is built,and the steady state performance and transient performance of the system are tested in different test conditions,and the data and waveform of the system are analyzed.The experimental results on the 200 KW prototype also show that the design of the control strategy has good performance in the low-voltage and high-current flow battery energy storage system power. |
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