Triangle connection cascade energy storage system two stage equalization control method

An energy storage system, balanced control technology, applied in electric vehicles, electrical components, transportation and packaging, etc., can solve the problem of not considering the difference in battery capacity, not considering the relationship between the balance ability and the overall charge and discharge time, and not considering the SOC safety boundary. And other issues

Active Publication Date: 2014-04-09
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This control strategy with the direct goal of eliminating SOC deviation is simple and easy to understand, but it also has the following shortcomings: 1) It is suitable for the static balance of the energy storage system. For the energy storage system in dynamic operation, this control strategy does not consider the balance capability Link to Overall Charge and Discharge Time
2) Does not consider the actual runtime SOC security boundary
The current control method that only considers the size of the SOC deviation cannot reflect the difference in control under the above conditions
3) Factors tha

Method used

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  • Triangle connection cascade energy storage system two stage equalization control method
  • Triangle connection cascade energy storage system two stage equalization control method
  • Triangle connection cascade energy storage system two stage equalization control method

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Embodiment

[0068] This embodiment is a 2MW battery energy storage system with a rated voltage of 10kV, delta connection, N=20 chain links per line, and a connection reactance of 20mH.

[0069] In this embodiment, the operating upper limit of the battery SOC is 0.9, and the lower operating limit is 0.1. The SOH of the battery is 0.9, and the rated capacity is 400Ah.

[0070] In this embodiment, 300 cells of 3.2V / 400Ah lithium iron phosphate batteries are connected in series to form a battery pack with a rated voltage of 960V and a rated capacity of 400Ah.

[0071] The process of this embodiment is as follows:

[0072] Step 1: Obtain the SOC and SOH information of each chain link of the chain energy storage system

[0073] The PCS obtains the SOC information of the 60 chain links of the three lines from the BMS every 3 seconds through the communication method. The SOH of the chain link batteries is 0.9, the upper and lower limits of the SOC operation are 0.9 and 0.1 respectively, and the...

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Abstract

The invention provides a triangle connection cascade energy storage system two stage equalization control method. The method comprises the steps that 1, SOC and SOH information of each link of a chained energy storage system is acquired; 2, rechargeable power and dischargeable power of each link are respectively calculated; 3, total rechargeable power and dischargeable power of each line and the whole system are calculated; 4, power distribution and control are carried out on each line; and 5, on the basis that the power of each line is determined, the voltage of each link is distributed according to the proportion of the rechargeable/dischargeable power of each link, and power distribution according to the proportion can be realized. According to the invention, the maximization of the capacity utilization rate of the energy storage system is used as a goal, namely simultaneous complete charging and discharging are carried out on batteries of all links; a safe operation boundary is considered, so that the requirement of the energy storage system for an equalization ability in different operation conditions and SOC states can be reasonably reflected; and an equalization performance is optimized in a range which can be realized.

Description

technical field [0001] The invention relates to an energy storage system equalization control method, in particular to a two-stage SOC equalization method applied to a triangular cascaded energy storage system, which is used in large-capacity battery energy storage occasions. It belongs to the field of battery energy storage. Background technique [0002] The cascaded energy storage system has attracted increasing attention due to its modular structure, high voltage, low current, low current harmonics and high efficiency under the same power. The control of the three lines of the cascaded energy storage system connected in a delta connection is decoupled from each other, and its control method is simpler than that in a star connection. This topology also has a two-level balancing function for the battery. [0003] At present, there are not many studies on the equilibrium control of cascaded energy storage systems at home and abroad. In 2008, Japanese scholar Akagi et al. p...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/42
CPCY02E60/10
Inventor 凌志斌郭海峰张百华陈满李勇琦李永兴杨宗强
Owner SHANGHAI JIAO TONG UNIV
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