A solar inverter and a control method thereof

Abstract

The invention relates to a solar inverter and a control method thereof. The method comprises the following steps: charging a battery pack by converting solar energy into electric energy; performing real-time detection of the voltage magnitude of the electric energy converted by the solar energy; When the voltage is smaller than a preset voltage threshold, switching to mains to charge the battery pack. By managing the charging process in the solar inverter and the battery management system, the abnormality of sudden power-off of the system caused by disconnecting the main circuit switch tube ofthe battery management system is greatly reduced, the reaction speed is fast, the back-end load power-off is not caused, and the reliability and efficiency of the whole system are simultaneously improved.

Description

Technical field [0001] The invention relates to the field of power generation, transformation and power distribution, in particular to a solar inverter and a control method thereof. Background technique [0002] At present, the technology of battery charging by solar energy has been widely used, and the charging, discharging and energy management of the battery pack of the energy storage system is a management difficulty of the energy system. [0003] In the prior art, the solar power supply system is composed of separate solar inverters and battery packs; the application of lithium batteries is only the lithium battery management system (BMS) added to the lithium battery, and it is still Independent components, charge and discharge management of the battery, and battery energy management are all calculated by the inverter system based on the simple estimation of the battery voltage. Moreover, in the current battery management systems on the market, most of the charge and discharge...

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Problems solved by technology

[0003] In the prior art, 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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