Method and device for evaluating energy storage unit power distribution of energy storage power station

Abstract

The invention provides a method and a device for evaluating energy storage unit power distribution of an energy storage power station. The method comprises: calculating power-energy state SOE relevancy of a battery pack string, according to the power-SOE relevancy, evaluating power distribution conditions of an energy storage unit on each battery pack string in an operation process; according to the power-SOE relevancy, calculating a power-SOE relevancy standard deviation coefficient of the battery pack string, according to the standard deviation coefficient, evaluating dispersion degree of the power-SOE relevancy of the battery pack string at each time in an operation process of the energy storage unit; and according to the standard deviation coefficient, calculating a standard deviation coefficient aggregate value of the power-SOE relevancy of the battery pack string, and according to the aggregate value, evaluating variation trend of battery pack string power distribution by the energy storage unit with run time. The method and the device solve technical problem in the prior art that power distribution of a battery pack string cannot be effectively evaluated, and a technical effect of effectively evaluating power distribution of the battery pack is achieved.

Description

technical field [0001] The invention relates to the technical field of evaluating the performance of an energy storage unit, in particular to an evaluation method and device for power distribution of an energy storage unit of an energy storage power station. Background technique [0002] With the continuous increase of wind power and photovoltaic projects, energy storage technology, as an effective means to suppress the volatility and intermittency of new energy power generation, has also developed rapidly. The energy storage unit is the basic unit of the energy storage power station. The energy storage unit is composed of multiple battery packs connected in series and parallel. The specific structure is as follows: figure 1 As shown, the state of energy (SOE) is the most important performance index of the energy storage unit. Since the SOE of the energy storage unit is determined by the battery string with the worst energy state, the SOE consistency of the battery string is...

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Problems solved by technology

[0005] An embodiment of the present invention provides a method for evaluating the power distribution of energy storage units of an energy storage power station to solve the technical problem in the prior art that the power distribution of battery pack energy storage units cannot be effectively evaluated. The method includes:

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