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Photovoltaic energy storage system for tracking maximum power generation power of photovoltaic cell and photovoltaic power generation system based on photovoltaic energy storage system

A technology of maximum power tracking and photovoltaic energy storage, applied in photovoltaic power generation, battery circuit devices, arrangement of multiple synchronous batteries, etc., can solve problems such as unstable power generation capacity of photovoltaic cells, achieve simplified control methods, reduce maintenance costs, Effect of system cost reduction

Active Publication Date: 2022-02-18
刘铭新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention solves the problem in the photovoltaic power generation technology that the power generation capacity of the photovoltaic cell is unstable due to the influence of the output characteristics of the photovoltaic cell by the external parameters such as the temperature and light of the environment, and proposes a maximum power tracking of the photovoltaic cell Photovoltaic energy storage system and photovoltaic power generation system based on it

Method used

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  • Photovoltaic energy storage system for tracking maximum power generation power of photovoltaic cell and photovoltaic power generation system based on photovoltaic energy storage system
  • Photovoltaic energy storage system for tracking maximum power generation power of photovoltaic cell and photovoltaic power generation system based on photovoltaic energy storage system
  • Photovoltaic energy storage system for tracking maximum power generation power of photovoltaic cell and photovoltaic power generation system based on photovoltaic energy storage system

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Embodiment approach 1

[0061] Embodiment 1. The photovoltaic energy storage system for maximum power tracking of photovoltaic cell power generation described in this embodiment includes: an energy storage battery pack composed of N+X single cells, a BEMS single controller, and a BEMS module The controller, where the BEMS single controller is used to control the charging of the single battery, the BEMS module controller is used to control the charging control of the battery pack as a whole, and is also used to realize the photovoltaic maximum power tracking control.

[0062] The N+X single cells in the battery pack all have control switches, which can realize any series connection of N single cells.

[0063] In actual use, the energy storage battery pack described in this embodiment is connected in parallel with a photovoltaic module for storing the electric energy generated by the photovoltaic module.

[0064] In the energy storage battery pack, N+X is the total number of single cells contained in t...

Embodiment approach 2

[0069] Embodiment 2. This embodiment is a further limitation of the photovoltaic energy storage system for tracking the maximum power generated by photovoltaic cells described in Embodiment 1. In this embodiment: the BEMS module controller is embedded with a software module for To realize the overall charge control of the battery pack, and also to realize the photovoltaic maximum power tracking control, the software module includes:

[0070] A cycle control unit for timing and controlling the maximum charging power tracking cycle;

[0071] A detection unit for real-time detection of charging current and total voltage in the charging circuit;

[0072] At the end of each tracking cycle, a power calculation unit that obtains the total charging power of the charging circuit;

[0073] At the end of each tracking cycle, adjust the adjustment unit of the online battery. This unit is used to compare the total charging power of the current tracking cycle with the total charging power ...

Embodiment approach 3

[0079] Embodiment 3. This embodiment is a further limitation of the photovoltaic energy storage system for tracking the maximum power generated by photovoltaic cells described in Embodiment 2. In this embodiment: the software module also includes:

[0080] At the end of each tracking cycle, a cell voltage detection unit that detects the terminal voltage of each cell in the energy storage battery pack;

[0081] When the number N of online single batteries is adjusted to increase by 1, the addition selection unit of the single battery is selected, which is used to select the single battery with the minimum terminal voltage of the single battery in the standby state to be connected in series in the charging circuit in the next tracking cycle;

[0082] When adjusting the number of online single batteries N minus 1, select the cut-off selection unit for cutting off the single battery, which is used to select the single battery with the highest terminal voltage among the online batte...

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Abstract

The invention discloses a photovoltaic energy storage system for tracking the maximum power generation power of a photovoltaic cell and a photovoltaic power generation system based on the photovoltaic energy storage system, and relates to the control technology of the photovoltaic cell. The problem that in the photovoltaic power generation technology, the power generation capacity of a photovoltaic cell is unstable due to the fact that the output characteristic of the photovoltaic cell is affected by external parameters such as the temperature and illumination of the environment where the photovoltaic cell is located is solved. The photovoltaic energy storage system comprises an energy storage battery pack composed of N + X single batteries, a BEMS single controller and a BEMS module controller, the BEMS single controller is used for connecting or disconnecting the corresponding single batteries into a charging loop according to instructions of the BEMS module controller, and the BEMS module controller is used for controlling charging control of the whole battery pack, and is also used for realizing photovoltaic maximum power tracking control. Compared with the prior art, the photovoltaic power generation system is characterized in that a DC / DC conversion module is omitted, and the photovoltaic energy storage system is adopted. The invention relates to a photovoltaic energy storage system and an improvement on an existing photovoltaic power generation system.

Description

technical field [0001] The invention relates to the control technology of photovoltaic cells. Background technique [0002] In the existing field of photovoltaic power generation technology, since natural light is converted into electrical energy, in practical applications, the output characteristics of photovoltaic cells are significantly affected by external parameters such as the temperature and light of the environment, resulting in a passive power generation capacity of photovoltaic cells. State, that is: its output characteristics change with the changes in the environment, which makes it difficult for photovoltaic energy storage systems in the field of photovoltaic power generation to achieve the maximum energy storage effect under the premise of such changes. [0003] In the existing conventional photovoltaic energy storage system, when the DC connection method is adopted, except that the input DC voltage of the PCS (Power Conversion System) inverter is allowed to fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J7/35
CPCH02J7/0013H02J7/35H02J7/007H02J7/00712H02J2300/26Y02E10/56
Inventor 刘铭新
Owner 刘铭新
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