A substation battery multifunction control system and a control method thereof

A technology of a control system and a control method, applied in the direction of charge equalization circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., to achieve the effects of high energy utilization rate, improved efficiency and accuracy, and simplified method

Inactive Publication Date: 2018-12-14
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, to develop a set of substation battery multi-function control system and its control method, so that it has multi-functional control of battery pack equalization, battery pack SOC estimation based on artificial neural network algorithm and internal resistance online measurement, is what those skilled in the art have always wanted. Technical challenges to be resolved, but so far, unresolved

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  • A substation battery multifunction control system and a control method thereof
  • A substation battery multifunction control system and a control method thereof
  • A substation battery multifunction control system and a control method thereof

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Embodiment 2

[0063] Embodiment 2, the rated capacity of the battery pack in this embodiment is 80Ah. First, the battery pack is charged and discharged three times without opening the equalization module, and the capacity of the whole battery pack is about 80.5Ah. Then, charge and discharge cycles are carried out on some of the batteries, so that the whole set of batteries is in an unbalanced state. After the treatment, the charge and discharge test of the battery pack is performed, and the measured capacity is about 59.2Ah.

[0064] This embodiment is to carry out two-way active equalization control on the multifunctional control system of the storage battery used in the substation in Embodiment 1, and its control method is:

[0065] The mathematical model of the state analysis of the battery pack embedded in the CPU makes statistics and analyzes on the real-time changes in the battery pack voltage, internal resistance, and the dispersion of voltage and internal resistance, and then judges...

Embodiment 3

[0067] Embodiment 3, this embodiment is to estimate the SOC of the battery pack in the multifunctional control system for the battery used in the substation of Embodiment 1, and the method is as follows:

[0068] ① Establish battery pack SOC estimation model

[0069] Through the analysis, it can be known that the SOC of the battery pack is the result of multiple factors, usually including temperature, charge and discharge rate, battery SOH (health state), voltage, internal resistance, etc.; therefore, the difficulty in obtaining the SOC accurately lies in the relationship between SOC and various factors. The existence of a complex mapping relationship between them; the reason for the poor accuracy of traditional battery SOC estimation is that its method only looks for the mapping relationship for one of the factors, and does not consider the impact of other factors on battery SOC estimation, so the consideration is not systematic; therefore , it is necessary to consider the jo...

Embodiment 4

[0083] Embodiment 4, this embodiment is basically the same as Embodiment 3, except that: the step ③ of estimating the SOC of the storage battery pack uses the RBF neural network to estimate the SOC of the storage battery pack online.

[0084] The RBF neural network and the BP neural network are the same three-layer forward network: the first layer is the input layer, and the number of nodes is equal to the dimension of the input; the middle is the hidden layer, and the number of nodes depends on the specific problem; the last is the output layer. layer, the number of nodes is the dimension of the output data; the hidden layer of RBF neural network is nonlinear, and radial basis function is usually used as the basis function, so as to transform the input vector space into the hidden layer space, so that the original linear inseparable problem becomes It is linearly separable, and the output layer is linear; the basic idea of ​​the RBF neural network is: use the RBF function as t...

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Abstract

The invention relates to a multifunctional control system and a control method of a battery used in a substation, which is characterized in that the multifunctional control system comprises a currentacquisition module, an input end of the current acquisition module is connected with a current sensor, and an output end is connected with an input end of an A/D converter. The input end of the temperature acquisition module is connected with the temperature sensor, and the output end is connected with the input end of the A/D converter. The output of A/D converter is connected with CPU through I/O interface. The CPU is also connected with human-computer interaction module, discharge load and voltage balancing module through I/O interface, and the discharge load and voltage balancing module are electrically connected with each single battery respectively. The control method comprises the following steps of: balancing control of a battery pack; SOC estimation of battery pack; measurement ofinternal resistance of battery pack.

Description

technical field [0001] The invention relates to a battery multifunctional control system for a substation and a control method thereof. Background technique [0002] Batteries are widely used due to their stable performance and price advantages: in the utilization of new energy sources such as wind power and photovoltaics, batteries can be used as energy storage systems to stabilize fluctuating power caused by unstable new energy sources; at the same time, batteries can also be used as main The power supply provides power support for electric vehicles; in the power system, the battery, as the backup power supply of the DC system of the substation, undertakes the power supply task of the DC system, and also plays a very important role in ensuring the reliable operation of secondary equipment. In practical application, the battery pack needs to be connected in series by individual cells to form a battery pack. However, the service life of the battery pack will decrease in act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 何大庆陈志强王建国丁伟权利刚熊飞王渤张吉刘旭张松利辛鹏付君董飚孙振胜迟作为牛湘智李介夫刘诗
Owner STATE GRID CORP OF CHINA
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