A charging and discharging process switching control method for a battery and supercapacitor hybrid energy storage system
A technology of hybrid energy storage system and charging and discharging process, which is applied in the direction of battery load switching, battery circuit devices, collectors, etc., can solve the problems of inconvenient use, complicated technology, and large amount of calculation, and achieve small amount of calculation and simple technology , Ease of use
Active Publication Date: 2018-10-19
ZHEJIANG UNIV OF TECH
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Problems solved by technology
[0004] In order to overcome the shortcomings of the existing supercapacitor and storage battery charging and discharging switching control technology, which have a large amount of calculation, complex technology, and inconvenient use, the present invention provides a storage battery with a small amount of calculation, simple technology, convenient use, and good practicability. Switching control method for charging and discharging process of supercapacitor hybrid energy storage system
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[0037] The present invention will be further described below in conjunction with the accompanying drawings.
[0038] refer to figure 1 and figure 2 , a battery and supercapacitor hybrid energy storage system charge and discharge process switching control method, comprising the following steps:
[0039] Step 1. According to the principle of energy conservation in the charging and discharging process of batteries and supercapacitors, a dynamic switching model for the charging and discharging process of the battery and supercapacitor hybrid energy storage system is established, and the charging and discharging process is represented by the change of the remaining charge of the energy storage device in the energy storage system. Apply the principle of energy conservation to establish a dynamic mathematical model of the charging and discharging process of the energy storage device in the hybrid energy storage system, see formulas (1), (2), (3) and (4)
[0040]
[0041]
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The invention discloses a storage battery and super capacitor mixed energy storage system's power charge and discharge switching control method. The method comprises the following steps: 1) according to the energy conservation theorem in the power charge and discharge process of the storage battery and the super capacitor, creating a dynamic switching model for the power charge and discharge process of the storage battery and supper capacitor mixed energy storage system; using the change of the remaining charges of the energy storage device in the energy storage system to represent the power charge and discharge process; applying the energy conservation theorem to create a dynamic mathematical model for the power charge and discharge process of the energy storage device in the mixed energy storage system; 2) considering the actual charge and discharge of the storage battery and the super capacitor; changing the design of the dynamic model for the charge and discharge process of the mixed energy storage system; and 3) constructing an input function uc(t) for the power charging process and an input function ud(t) for the power discharging process. According to the invention, the computing complexity is small; the technology is simple; and the method can be conveniently applied to achieve good practicality.
Description
technical field [0001] The invention relates to a switching control method for charging and discharging processes of a storage battery and a supercapacitor hybrid energy storage system. Background technique [0002] In the current distributed power grid, the proportion of renewable energy such as wind energy and solar energy is increasing. Due to the intermittent and random nature of the power output power of these energy sources affected by environmental factors, it will cause many adverse effects on the safety and stability of the power system after they are connected to the grid. Usually a certain proportion of static var compensator is allocated to renewable energy to quickly compensate its reactive power and maintain voltage stability at the point where it is connected to the grid. For active power compensation, it is necessary to configure a certain capacity energy storage system on the renewable energy source side . By optimizing the control of the energy storage sy...
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IPC IPC(8): H02J7/34H02J7/00
CPCH02J7/0068H02J7/345
Inventor 宋秀兰孟利民陈怡王蕾
Owner ZHEJIANG UNIV OF TECH