Charge control method of photovoltaic charge controller

Abstract

A charge control method of a photovoltaic charge controller is characterized in that charging models needed by a storage battery energy storage system are obtained through judgment, corresponding control algorithms are adopted according to the different charging models to obtain input voltage instructs, and the purpose of accurately and fast controlling the charging models is achieved through a double closed loop of input voltage and an output current and feedforward control. The charging models are all used for controlling the input voltage so as to enable the control algorithms to be simple, convenient and practical, and smooth switchover among the charging models can be achieved. The photovoltaic charge controller is enabled to have the advantages of being high in dynamic response speed and control precision, and simple in control procedures through a control method of combining of the closed loop and the feedforward control. The purposes of carrying out high-efficient, fast and accurate maximum power tracing, equalized charging and floating charging continuation multi-model charge control on the storage battery energy storage system through the photovoltaic charge controller are well achieved. According to the charge control method of the photovoltaic charge controller, photovoltaic charging speed can be improved, voltage control precision of a storage battery group can be improved, and service life of a storage battery is prolonged.

Description

technical field [0001] The invention relates to a control method for charging a storage battery energy storage system by a photovoltaic charging controller. Background technique [0002] The field of photovoltaic power generation is developing rapidly, and its application fields are constantly expanding. With the continuous expansion of photovoltaic power generation capacity, the photovoltaic power generation system has developed from the original non-adjustable power generation mode to the adjustable power generation and can participate in grid dispatching. [0003] This requires that the photovoltaic power station is no longer a power fluctuation and non-adjustable power generation system. Photovoltaic power stations need to increase the energy storage link to realize the adjustable and dispatchable power of the power station. Adding an energy storage system to a photovoltaic power station not only ensures stable and reliable output power of the photovoltaic system, but ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of cumbersome control and judgment, low control precision and slow response speed in the charging control method in the prior art, and provide a new charging control method for photovoltaic charging controllers

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