Research on the Control Technology of Bidirectional DC Converter in the Energy Storage Power Supply

摘要

The energy storage power system based on solar cell array-battery group can keep the power supply stable under the condition of non-online power supply. In order to reduce the volume of energy storage power supply, the bidirectional DC converter replaces the charger and discharger originally used to connect the battery group with the solar array, and is introduced into the high-voltage power supply system to realize the two-way energy transfer. On the basis of considering the working state of solar array and battery group and bus voltage, the control strategy of the non-isolating converter is designed in the paper. According to the battery voltage to determine its energy storage state, the control system makes the converter working in the two states of buck and boost, to ensure the stability of the bus voltage. The simulation model of storage power supply based on the bidirectional DC converter is established by Matlab/Simulink and the simulation results show that the control strategy can store electric energy reasonably, improve the utilization rate of energy, realize the stability of bus voltage, and improve the reliability of the whole system.