Hybrid energy storage power distribution method and system

A technology of hybrid energy storage and distribution methods, applied in the direction of AC network load balancing, etc., can solve problems such as high cost, ability to reduce high frequency power of super capacitors, high and low frequency signal components, etc.

Active Publication Date: 2021-01-29
天津津电供电设计所有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at the handover frequency of this method, the output signal of the traditional low-pass filter may contain higher high-frequency signal components, and the output signal of the traditional high-pass filter may contain higher low-frequency signal components
The low-frequency signal component is given by the power of the supercapacitor. Larger low-frequency power will cause overcharge or overdischarge of the supercapacitor. The impact is mainly divided into two aspects. One is that the overcharge or overdischarge of the supercapacitor will reduce the The ability of the capacitor to bear high-frequency power, and the second is to choose a larger-capacity super capacitor to avoid overcharging and over-discharging of the super capacitor, and the cost is higher

Method used

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  • Hybrid energy storage power distribution method and system

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Embodiment 1

[0057] figure 1 It is a flow chart of the hybrid energy storage power distribution method provided by Embodiment 1 of the present invention.

[0058] The traditional hybrid energy storage power distribution method is to use the first-order low-pass filter method. The energy-type energy storage device (taking a lithium battery as an example) should compensate the power as shown in formula (1), and the power-type energy storage device (taking supercapacitor as an example) should compensate the power as shown in the formula (2):

[0059]

[0060]

[0061] Among them, P ins_LB (s) is the lithium battery should compensate power, P ins_SC (s) is the power that should be compensated by the supercapacitor, P HESS (s) is a power command, s is a complex variable in the complex field, and T is a filter time constant.

[0062] When the filtering time constant T is 0.1s, the handover frequency ω is as shown in formula (3):

[0063]

[0064] Then the Bode diagram of the tradit...

Embodiment 2

[0077] Figure 6 The circuit diagram of the RC filter network provided by Embodiment 2 of the present invention.

[0078] In this embodiment, based on the RC filter network, the hybrid energy storage power allocation method provided in the above embodiments, especially the allocation step S130, will be specifically analyzed.

[0079] Set the power command P HESS (s), the high-frequency power command P of the super capacitor ins_SC (s) As the voltage values ​​of the RC filter network circuit, such as Figure 6 shown.

[0080] In the initial state, U C =0, power command P HESS After entering, P ins_SC , U C , i(t) starts to change, then there is formula (6):

[0081]

[0082] When the circuit is in steady state, U C =0, that is, the integral of the current is 0, U C The time constant for the attenuation to 0 is T'=2RC=2T. The power command of this part of the frequency component does not belong to the high-frequency power range, which can be regarded as provided by ...

Embodiment 3

[0101] Figure 11 It is a schematic diagram of a hybrid energy storage power distribution system provided by Embodiment 3 of the present invention.

[0102] This embodiment provides a hybrid energy storage power distribution system, which is used to implement the hybrid energy storage power distribution method in the foregoing embodiments. refer to Figure 11 , the hybrid energy storage power distribution system mainly includes the following units:

[0103] The filtering unit 100 is configured to use a second-order filtering method to filter out low-frequency power components in the power to be compensated by the power-type energy storage device to obtain corresponding high-frequency power commands;

[0104] Specifically, the high-frequency power command is calculated according to formula (4) in the foregoing embodiments.

[0105] The calculation unit 200 is used to obtain the low-frequency power command of the energy-type energy storage device according to the compensation...

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Abstract

The invention provides a hybrid energy storage power distribution method and system, which relate to the technical field of power control, including: using a second-order filtering method to filter out the low-frequency power components in the power to be compensated by power-type energy storage devices to obtain the corresponding high frequency power command; obtain the low-frequency power command of the energy-type energy storage device according to the compensation power of the energy-type energy storage device and the high-frequency power command; provide the high-frequency power command through the power-type energy storage device, and adjust the energy storage state according to the high-frequency power command control, and at the same time, provide low-frequency power commands through energy-type energy storage devices. The invention distributes high-frequency power commands to power-type energy storage devices and low-frequency power commands to energy-type energy storage devices by constructing a second-order filter, so as to prolong the service life of energy-type energy storage devices and the maximum efficiency of power-type energy storage devices. Optimal state of charge, simplifies the control strategy of the energy storage system, reduces the capacity selection of power-type energy storage devices, and saves costs.

Description

technical field [0001] The invention relates to the technical field of power control, in particular to a hybrid energy storage power distribution method and system. Background technique [0002] Due to the different energy storage principles, energy-type energy storage devices such as lithium batteries have high energy density, low cycle life, and poor ability to undertake high-power discharge, while power-type energy storage devices such as supercapacitors have high power density and high cycle life. , Low energy density, can bear high power discharge. In this regard, some scholars have proposed to use a hybrid system of lithium batteries and supercapacitors to make the energy storage system have high energy density and high power density at the same time, and improve the performance of the energy storage system. [0003] In the hybrid energy storage system, the real-time power distribution of energy-type energy storage devices and power-type energy storage devices is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/28
CPCH02J3/28
Inventor 李学斌张燚陈海波刘剑陈世龙
Owner 天津津电供电设计所有限公司
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