Hybrid energy storage system power distribution device and method
A hybrid energy storage system and distribution device technology, applied in circuit devices, battery circuit devices, DC network circuit devices, etc., can solve the problems of high power density, energy dissipation, and tunnel temperature rise of supercapacitors, and delay full exit Operation status, reduction of energy waste, effect of reduction of energy loss
Inactive Publication Date: 2021-01-26
BEIJING JIAOTONG UNIV +2
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[0009] This control strategy is relatively simple, but it also has disadvantages, such as Figure 4 As shown in the two situations in , it will cause energy to be dissipated in the form of heat, which not only causes energy waste, but also brings problems such as tunnel temperature rise and brake shoe loss
However, because the battery and the supercapacitor share the voltage outer ring, and the supercapacitor has high power density and low energy density, the supercapacitor will be charged to the maximum allowable SOC in a short period of time. At this time, the supercapacitor will stop running and the air brake Make up the remaining braking power, leading to the occurrence of situation 2
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[0035] The present invention will be described in detail below with reference to the accompanying drawings and examples. The exemplary embodiments and descriptions therein are only used to explain the present invention, but not to limit the present invention.
[0036] In order to achieve effective control of the two energy storage elements, this application proposes an independent control structure for the limitations of the shared voltage loop, such as Figure 5 shown. In this control structure, the voltage outer loop of the battery and the supercapacitor are separately controlled independently, and the command values of their charge and discharge voltages are given respectively. Whether the working condition is discharging or charging, when it is discharging working condition, the command value of battery voltage and U dc Make a difference and adjust the outer loop PI to get the power demand value, and then get the battery current given value I after passing the limiter ...
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The invention discloses a ground battery super capacitor hybrid energy storage system power distribution device and method for urban rail transit, and the device is provided with an energy storage element 1 and an energy storage element 2. The independent voltage closed-loop control is performed on the two types of energy storage elements, and voltage control instruction values are respectively given to the energy storage element 1 and the energy storage element 2; and the function relationship between the given voltage control instruction value and the direct-current bus current has two curves with different slopes. Based on the control strategy of the independent structure, the energy loss is effectively reduced, the energy saving rate of the energy storage device is improved, and the situation that the super capacitor is fully charged and quits operation can be delayed, so that the starting of air braking is reduced, and the energy waste is reduced.
Description
technical field [0001] The invention relates to the technical field of urban rail transit regenerative braking energy utilization, in particular to a ground-type battery-supercapacitor hybrid energy storage system power distribution device and method for urban rail transit. Background technique [0002] With its relatively low energy consumption to capacity ratio, urban rail transit has become an increasingly common choice to meet the transportation needs of countries all over the world. According to statistical data, train braking energy accounts for about 30-60% of traction energy. Effective use of this part of regenerative braking energy can greatly reduce the energy consumption of train operation, thereby improving the energy saving effect. In order to recover regenerative braking energy and stabilize grid voltage, more and more energy storage devices are installed in the traction power supply system. Batteries, flywheels and supercapacitors are commonly used energy sto...
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IPC IPC(8): H02J7/00H02J7/34H02J1/10H02J1/14
CPCH02J7/345H02J7/0068H02J1/14H02J1/106
Inventor 杨中平林飞李彬赵亚杰孙湖
Owner BEIJING JIAOTONG UNIV