Method and system for dynamically tracking and monitoring internal resistance of energy storage power station

Abstract

The invention discloses a method and a system for dynamically tracking and monitoring internal resistance of an energy storage power station. The method comprises the following steps: determining a solution mode of the internal resistance of a power station to be measured according to user selection, wherein the solution mode comprises a wide voltage range alternating current impedance method or an intelligent parameter identification method; receiving a data acquisition mode instruction selected by a user, wherein a data acquisition mode comprises a battery monomer internal resistance acquisition mode, a battery cluster internal resistance acquisition mode or a power station overall acquisition mode; acquiring power station data information acquired by the data acquisition mode selected by the user, wherein each solving mode corresponds to unique power station data information; and solving the data information of the power station by using the solving mode, and calculating the overall internal resistance value according to the structure of the power station to be measured. The method is a dynamic tracking and monitoring method for the internal resistance of a multi-channel and multi-voltage-class energy storage power station, the multi-channel and multi-voltage-class characteristics can be correspondingly selected according to actual conditions of the power station, and the power station can be effectively and dynamically monitored.

Description

technical field [0001] The invention belongs to the technical field of internal resistance monitoring of an energy storage power station, and more specifically relates to a method and system for dynamic tracking and monitoring of the internal resistance of an energy storage power station. Background technique [0002] Facing the dual-carbon goal, the development of a new power system based on new energy is the key to the transformation of my country's energy structure. At present, new energy stations are encouraged to configure energy storage power stations to meet the requirements of the new version of the power system stability guidelines. The electrochemical energy storage power station is composed of battery DC system, PCS, monitoring system and power distribution system. Due to the obvious quantitative change process of capacity, internal resistance and battery state of health (SOH) in the application of the battery DC system, the dynamic evolution characteristics of th...

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Problems solved by technology

However, there is no effective dynamic monitoring method for the internal resistance of the electrochemical energy storage power station, especially in the equivalent model of the electrochemical energy storage battery, which affects the grid parameters, ohmic resistance, polarization resistance, polarization capacitance, etc. To refine the parameters, it is necessary to optimize the traditional electrochemical impedance measurement method based on the voltage and current characteristics of the DC system of the electrochemical energy storage power station, and integrate the intelligent system identification method of the power grid model to conduct dynamic monitoring of the internal resistance of the electrochemical energy storage power station.

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