Emergent direct supply off-grid photovoltaic power supply system based on existing photovoltaic controller

Abstract

The invention belongs to the technical field of photovoltaic power generation and supply and particularly relates to an emergent direct supply off-grid photovoltaic power supply system based on an existing photovoltaic controller. According to the technical scheme of the invention, a photovoltaic power power-on emergent direct supply power path, a photovoltaic power power-off emergent direct supply power path and a photovoltaic power power-off emergent power storage power path are set up in a communicating way, and power is directly supplied to a user emergent lamp and a storage battery pack, so that the power of photovoltaic power generation can be fully utilized when a photovoltaic system stops running due to a failure to cause that power cannot be used even though power exists in the photovoltaic system; meanwhile, power is stored in the storage battery pack through a throttling and threshold circuit, and damage to storage batteries due to the abnormality of the photovoltaic system is greatly reduced. When set working power exists in the system, emergent power supply is automatically converted to system power supply by a bypass threshold control switch, so that users can timely, effectively and sufficiently utilize the photovoltaic power generation system and utilize the photovoltaic power to an utmost degree in an automatically-regulated environment. The use efficiency of the photovoltaic system is improved, photovoltaic utilizing rate is increased, photovoltaic utilizing time is prolonged, and the photovoltaic power generation and supply system which is convenient and efficient is provided to the users.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation and power supply, and specifically relates to an emergency direct-supply off-grid photovoltaic power supply system based on an existing photovoltaic controller. Background technique [0002] At present, a large number of household off-grid photovoltaic power supply systems are used in remote areas without electricity, making contributions to solving the basic daily electricity consumption of residents without electricity. However, existing technologies and systems such as figure 1 As shown, its various circuit modules and batteries are interrelated with the photovoltaic controller as the center, and any problem in any part will affect the composition and operation of the system. When the system fails to supply power due to service conditions (such as poor battery contact) and system hardware failure and component damage (such as system protection circuit, photovoltaic contro...

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Problems solved by technology

[0003] In order to overcome the above-mentioned defects and deficiencies in the existing technologies and products, the photovoltaic system can make full use of the power when it can generate electricity when the photovoltaic system stops running due to a fault, and at least solves emergency power supply such as lighting and DC electrical appliances. Problem, the present invention proposes an emergency direct supply off-grid photovoltaic power supply system based on the existing photovoltaic controller, including: photovoltaic power generation components (1), photovoltaic controller (2), inverter circuit (3), battery pack ( 4), charging busbar (5), storage power supply busbar (6), photovoltaic power supply busbar (7), AC load connection port (8), system controller (9), bypass threshold control switch (10), emergency power supply Busbar (11), emergency power load connection port (12), emergency busbar electric control and manual switch (13a), charging and discharging adjustment switch (13b), DC load port (14), current limiting and protection circuit (15) , system bus (16), DC parallel connection circuit module (17) and current limiting and threshold value circuit (18), it is characterized in that:

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