SOC estimation method and system based on hybrid energy storage device
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A hybrid energy storage and estimation model technology, which is applied to measuring devices, instruments, measuring electronics, etc., can solve the problems of low SOC estimation accuracy and large errors
Pending Publication Date: 2019-10-22
BEIFANG UNIV OF NATITIES
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[0005] The purpose of the present invention is to improve the problems existing in the prior art. The existing SOC estimation method is not suitable for the SOC estimation of the hybrid energy storage device, and the SOC estimation accuracy is low, the error is large, and the problems that cannot meet the actual needs; the present invention adopts The technical solution is:
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Embodiment 1
[0082] see figure 1and figure 2 , this embodiment provides an SOC estimation method based on a hybrid energy storage device, including the following steps:
[0083] Step 1. Obtain the state parameters of the battery in the hybrid energy storage device and set the preset parameters. The state parameters include the open circuit voltage V of the battery obtained through collection. oc , load current I, internal resistance R s , the preset parameters include the polarization resistance R of the battery p , Polarized capacitance C p , Coulombic efficiency η, charge capacity Q, etc., for the establishment and calculation of subsequent models;
[0084] As an example, in this embodiment, the combination of multi-channel analog switch and floating measurement method can be preferentially used to collect the open circuit voltage V oc .
[0085] Step 2. Establish an equivalent circuit model of the hybrid energy storage device, and construct a set of vector parameters including th...
Embodiment 2
[0136] According to the estimation method provided in Embodiment 1, Embodiment 2 provides an SOC estimation system based on a hybrid energy storage device, including a data acquisition unit, a controller, a data transmission unit for transmitting data, and a cloud platform. The cloud platform includes a data receiving unit, a data storage unit, a data processing unit and a display unit adapted to the data sending unit, the data collecting unit and the data sending unit are connected to the controller respectively, and the data receiving unit Unit, data storage unit, and display unit are connected to the data processing unit respectively, such as image 3 As shown, among them,
[0137] The data acquisition unit is used to collect the voltage (i.e. open circuit voltage), current (i.e. load current) and internal resistance of the hybrid energy storage device, and transmit them to the controller. Estimate the charge state, and send the voltage, current, internal resistance and ch...
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Abstract
The invention relates to a SOC estimation method and system based on a hybrid energy storage device. The method comprises the steps of: acquiring a state parameter of a battery and setting a preset parameter; establishing an equivalent circuit model, and constructing a set of vector parameters including the preset parameter, and using the equivalent circuit model to solve the terminal voltage of the battery according to the state parameter and the vector parameters; establishing a SOC estimation model which solves the SOC of the battery according to the terminal voltage and the vector parameters; establishing a least squares model which is configured to iteratively calculate the vector parameters and return the iteratively calculated vector parameters to the equivalent circuit model and the SOC estimation model; and repeating the steps 2 to 4. The estimation method can realize the closed-loop correction of the SOC estimation process, improves the estimation accuracy of the SOC, reducesan error, not only satisfies an actual demand, but also is suitable for estimating and monitoring the SOC in the hybrid energy storage device, and contributes to the online and remote monitoring of the SOC of the hybrid energy storage device.
Description
technical field [0001] The invention relates to the technical field of energy storage equipment, in particular to an SOC estimation method and system based on a hybrid energy storage device. Background technique [0002] With the development of new energy technology, more and more hybrid energy storage devices (or systems) are used; hybrid energy storage devices are usually equipped with several supercapacitors and several battery packs, and each battery pack contains several batteries; Compared with batteries, supercapacitors have the characteristics of large capacity and fast charging and discharging. As a new energy storage device and a hybrid energy storage device composed of batteries, it has been widely used, and the parameter monitoring of hybrid energy storage devices has become an industry research. the key of. [0003] In the prior art, it is usually necessary to monitor or estimate the state parameters of the hybrid energy storage device, such as charging and dis...
Claims
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