Solar inverter, cell management system and solar power supply system

Abstract

The application relates to the technical field of new energy source control and application and particularly relates to a solar inverter, a cell management system and a solar power supply system, wherein the solar power supply system comprises a cell pack, the solar inverter and the cell management system, which are correspondingly connected. Compared with the prior art, the use of a switch tube in the cell management system is concealed through communication of the solar inverter and the cell management system; detected operation parameters of the cell pack are reported to the solar inverter through the cell management system by uploading data; charge and discharge parameters of the cell pack are adjusted by the solar inverter; and the connection of the cell pack and the solar inverter does not need to be cut off, therefore, the abnormity of sudden current failure caused by disconnection of a main path switch tube of the cell management system is greatly reduced; the response speed is fast; current failure of rear-end load is not caused, and the reliability and the efficiency of the entire system are simultaneously improved.

Description

technical field [0001] This application relates to the technical field of new energy control and application, in particular to a solar inverter, a battery management system and a solar power supply system. Background technique [0002] At present, the technology of solar energy charging batteries has been widely used, but the charging and discharging management and energy management of battery packs in energy storage systems are a difficult point in the management of energy systems. [0003] In the existing technology, the solar power supply system is composed of discrete solar inverters and battery packs; the application of lithium batteries is only the addition of lithium battery management systems (BMS) on the basis of lithium batteries, and it is still Independent components, charge and discharge management of the battery, and energy management of the battery are all obtained by the simple estimation of the battery voltage by the inverter system. Moreover, in the current...

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Problems solved by technology

[0003] In the existing technology, the solar power supply system is composed of discrete solar inverters and battery packs; the application of lithium batteries is only the addition of lithium battery management systems (BMS) on the basis of lithium batteries, and it is still Independent components, charge and discharge management of the battery, and energy management of the battery are all obtained by the simple estimation of the battery voltage by the inverter system. Moreover, in the current battery management system on the market, the consistency management of charge and discharge is mostly only applied to On the lithium battery, the current of the main control (electric switch tube) in the battery management system (BMS) is a difficult problem in the industry, and it is also the part with the highest failure rate. In the case of overvoltage, the battery management system will shut it down. Due to the slow response speed of the electric switch tube, the delay when the system resumes power supply will cause the backup power supply of the controller to be disconnected, which will easily lead to power failure of the back-end load. Huge losses, making the system less reliable and less efficient

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