| The energy storage system can effectively stabilize the intermittent power fluctuation of distributed power supply,and achieve peak load regulation.In this thesis,the solid heat storage system is taken as the research object,and its energy storage technology is studied,the power fluctuation suppression of distributed power grid and power peaking are realized,and the utilization efficiency of electric energy is improved.First of all,the operational principle of a variety of classic energy storage technology is analyzed,the electric power storage system includes battery energy storage,super capacitor,energy storage,and heat storage system includes ground source heat pump,air source heat pump,solid heat storage.According to the performance comparison of different energy storage technologies,a heat storage system with solid heat storage is proposed.Secondly,the mathematical model of solid heat storage system is established.Based on the variation of the temperature field of the solid heat storage material under different working conditions,the relationship between the temperature field and the current of the electric heating pipe is analyzed.On this basis,a winter heating circulation system is built using water as heating medium and Magnesium Oxide for the thermal storage.According to the ambient temperature,the storage current is controlled in real time so as to achieve the desired heating temperature.Finally,the mathematical model of the electric heat storage device and fan in the heat storage system is established,and the space vector pulse width modulation technique is applied to the control circuit of the heat storage system.The electric heat storage device is connected with the power grid through a three-phase voltage source PWM rectifier and a Buck voltage regulator.The rectifier adopts virtual magnetic flux orientation control,and the Buck circuit adopts peak current control mode to control the current of the electric heat storage device,and indirectly control the water supply temperature of the electric heat storage device.The fan is connected with the DC bus through the three-phase voltage source PWM inverter and adopts indirect field oriented control.With the nation "coal to electricity" project as an example,the electrical energy storage system operating conditions and economic benefits is described,the electric heat storage technology is applied to the project of "coal to electricity" project,and good operation results are achieved.The feasibility and effectiveness of the proposed method are proved. |
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