Control system of photovoltaic energy storage inverter

Abstract

The invention relates to the field of photovoltaic power generation, and especially relates to a control system of a photovoltaic energy storage inverter. The system comprises a booster circuit, a capacitor C1, a first voltage bi-directional regulation circuit, a capacitor C2 and a charge / discharge control circuit, wherein the charge / discharge control circuit is connected with a lithium battery, and the output end of the capacitor C1 is also connected with a detection control circuit and an inverter circuit. The detection control circuit is respectively connected with a first voltage bi-directional regulation circuit, a lithium battery and a charge / discharge control circuit, and is used for detecting the voltage at the lithium battery terminal and controlling the first voltage bi-directional regulation circuit and the charge / discharge control circuit to charge or discharge the lithium battery according to the detection result. The output end of the inverter circuit is connected to a power network. By using the invention, the following effects can be realized: when the voltage of the lithium battery may be lower than the normal working voltage, the lithium battery is forcibly charged, thereby avoiding the damage of the lithium battery caused by the deep discharge deficit of the lithium battery and causing the heavy economic loss.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a control system of a photovoltaic energy storage inverter. Background technique [0002] In the photovoltaic energy storage system, in many cases, the system is required to be self-generated and self-used, and it must also be able to be used on-load in off-grid conditions. , Sometimes the voltage of the battery will be discharged to a relatively low level, and once the energy is not replenished in time after being deeply discharged, the battery voltage may be lower than the normal operating voltage of the system. At this time, there is very little energy left in the battery, which cannot provide energy to the charger, and if the power is not replenished in time, the battery power will become less and less until it is deeply discharged and the battery is damaged, causing major economic losses. Contents of the invention [0003] In order to solve the above problems,...

AI Technical Summary

Problems solved by technology

[0002] In the photovoltaic energy storage system, in many cases, the system is required to be self-generated and self-used, and it must also be able to be used on-load in off-grid conditions. , sometimes the voltage of the battery will be discharged to a relatively low level, and once the energy is not replenished in time after being deeply discharged, the battery voltage may be lower than the normal operating voltage of the system

At this time, the remaining energy of the battery is very small and cannot provide energy to the charger. If the power is not replenished in time, the battery power will become less and less until it is deeply discharged and the battery is damaged, causing major economic losses.

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