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Photovoltaic energy storage inverter system

A photovoltaic energy storage and inverter system technology, applied in photovoltaic power generation, transportation and packaging, AC network circuits, etc., can solve problems such as poor bus power stability, improve power stability, improve safety and service life, and improve flexibility. The effect of scheduling

Pending Publication Date: 2019-04-30
SICHUAN CHANGHONG LIGHTING TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor bus power stability of the existing photovoltaic energy storage inverter system, and propose another photovoltaic energy storage inverter system

Method used

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  • Photovoltaic energy storage inverter system

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Embodiment

[0034] The smart photovoltaic energy storage inverter system described in the embodiment of the present invention may be an off-grid photovoltaic energy storage inverter system, such as figure 1 Shown, including photovoltaic array and inverter, also includes:

[0035] The first battery pack can supply power to the system after being charged by the output voltage of the photovoltaic array;

[0036] The second battery pack, after being charged from the DC bus through the step-down branch, can be discharged to the DC bus through the step-up branch, and is inverted by the inverter to supply power to the load;

[0037] Among them, the first battery pack and the second battery pack may be formed by a plurality of single batteries connected in series, wherein the first battery pack absorbs the micro-photoelectric energy of the photovoltaic array for direct charging. When the light is low, for example, Supply power to the system when the photovoltaic array cannot send out electric power, in...

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Abstract

The invention relates to the technical field of photovoltaic power generation. The invention is to solve the problem of the poor power stability of a busbar of an existing photovoltaic energy storageinverter system and proposes another photovoltaic energy storage inverter system including a photovoltaic array, an inverter, a first storage battery pack, a second storage battery pack, a data acquisition module, a control module, a first relay module, a second relay module and a third relay module. Different control strategies are employed for the photovoltaic array, the storage battery packs and the load according to different light intensity periods and different load requirements, flexible scheduling is performed, the self-control of the photovoltaic energy storage inverter system is achieved, the electric energy stability of the busbar is improved, the photoelectric utilization rate and the safety and service life of the storage battery packs are improved, and the invention is suitable for an off-grid type photovoltaic energy storage inverter system.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic energy storage inverter system. Background technique [0002] Affected by light intensity and temperature, photovoltaic energy storage inverter system power generation has the characteristics of intermittent, fluctuation and randomness. China has a vast territory and many remote areas cannot achieve grid coverage. Therefore, the use of photovoltaic arrays and energy storage battery packs to achieve microgrid distributed off-grid systems is a practical and popular operating mode. [0003] The existing photovoltaic energy storage inverter system mainly includes photovoltaic arrays, controllers, battery packs, inverters and loads. The photovoltaic array converts solar energy into electrical energy and inputs it to the DC bus when there is light. After it becomes alternating current, it supplies power to the load and at the same time charges the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J7/35
CPCH02J3/383H02J7/35Y02E10/56
Inventor 李珣李健张恩阳黄勇
Owner SICHUAN CHANGHONG LIGHTING TECH
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