Lithium battery energy storage frequency modulation cost accounting method considering life loss influence

Abstract

The present invention is a lithium battery energy storage frequency modulation cost accounting method considering the impact of life loss. Its characteristics include the analysis of the influence mechanism of operating conditions on the life loss of lithium battery energy storage, and the control strategy for lithium battery energy storage systems to participate in power system frequency modulation. Design and construction of energy storage frequency regulation cost accounting model considering life loss. This method aims at the problem that the cost of frequency regulation caused by the performance degradation of lithium battery energy storage in operating conditions is difficult to calculate, and comprehensively considers the static loss, dynamic loss, initial investment, operation and maintenance costs of lithium battery under operating conditions, and the participation of energy storage in frequency regulation. Various factors such as control strategies provide an accurate cost accounting method for the calculation of energy storage systems participating in power grid frequency regulation, which is of great significance for promoting energy storage to participate in the development of the power system auxiliary service market. It has the advantages of scientific rationality, strong applicability, and good results. .

Description

technical field [0001] The invention relates to the technical field of new energy power generation, and relates to a lithium battery energy storage frequency modulation cost accounting method considering the impact of life loss. Background technique [0002] As large-scale wind power is centrally connected to the grid, due to the strong fluctuation of wind power and the near-zero inertia of wind turbines, the frequency modulation of power systems with high wind power penetration faces severe frequency modulation burdens, and the fluctuation of wind power leads to frequent actions of traditional frequency modulation units, making mechanical The wear and tear of the components reduces the operating life of the frequency modulation unit, so the high wind power penetration grid urgently needs a new frequency modulation method. [0003] Energy storage systems have flexible and fast power regulation response characteristics, and the use of large-scale energy storage to participate...

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Problems solved by technology

[0002] As large-scale wind power is centrally connected to the grid, due to the strong fluctuation of wind power and the near-zero inertia of wind turbines, the frequency modulation of power systems with high wind power penetration faces severe frequency modulation burdens, and the fluctuation of wind power leads to frequent actions of traditional frequency modulation units, making mechanical Components are worn out, which reduces the operating life of frequency modulation units, so high wind power penetration grids urgently need new frequency modulation methods

[0003] Energy storage systems have flexible and fast power regulation response characteristics, and the use of large-scale energy storage to participate in power system frequency regulation has attracted widespread attention. The enthusiasm for power system frequency regulation has not yet been stimulated. Calculating energy storage frequency regulation costs is an important basis for formulating energy storage frequency regulation compensation strategies, and is of great value in promoting energy storage to participate in the development of power system auxiliary service markets; The technical economy of the energy storage system is also related to factors such as the energy storage frequency modulation strategy and the system frequency fluctuation characteristics. The nominal service life given by the energy storage system manufacturer is measured by the number of cycle charge and discharge cycles of the energy storage system in a specific charge and discharge mode. However, when energy storage participates in power grid frequency regulation, its charging and discharging mode cannot be completely consistent with the life test charging and discharging mode, which leads to a large difference between the life of energy storage in frequency regulation mode and the manufacturer's nominal life. In the past, the cost calculation was based on the nominal life. The cost is shared equally, which is very different from the actual cost. Therefore, it is urgent to construct an energy storage frequency regulation cost accounting method that considers the impact of energy storage battery life reduction to solve the technical problems that have been wanted to be solved in this field but have not been solved so far.

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