Power supply voltage sag protector of super capacitor energy storage and control method thereof

Abstract

The utility model relates to a power supply voltage sag protector of super capacitor energy storage and a control method thereof, belonging to the technical field of voltage sag protection. The protector comprises a mains supply voltage amplitude detection circuit, a mains supply voltage current phase detection circuit, a DC bus voltage detection circuit, a DC bus current detection circuit, a super capacitor voltage detection circuit, a load voltage detection circuit, a load voltage and current phase detection circuit, a super capacitor charging and discharging circuit, a power supply switching module, a super capacitor group and a balanced voltage circuit, a SCM (single chip microcomputer) control unit, a rectifier circuit, and a DC step-down circuit. The control method comprises a step of setting the cut back time length of a power supply switching module, a step of inputting load two-end current phase and grid voltage phase into the SCM control unit, a step of monitoring whether a mains supply grid has voltage sag or not, judging the voltage current phase at that time if so, and switching the mains supply grid power supply to super capacitor group power supply, and a step of switching the super capacitor group power supply into the mains supply grid power supply when the grid voltage is restored to be normal.

Description

technical field [0001] The invention belongs to the technical field of voltage sag protection, in particular to a power supply voltage sag protector for supercapacitor energy storage and a control method thereof. Background technique [0002] With the grid-connected grid, the increasing expansion of the ring network, and the increase in distribution circuits brought about by the increase in the capacity of the feed transformer, the phenomenon of instantaneous voltage loss of the power supply is becoming more and more frequent. The power grid voltage sag in some enterprises has little impact on the traditional control system, but the inverter itself has poor anti-shaking ability, which makes the inverter trip at low voltage, causes the motor to stop, affects production, and brings huge economic losses to the enterprise. The basic working principle of the frequency converter is to first rectify the AC power into DC, and then invert the DC into an adjustable AC, so as to achiev...

AI Technical Summary

Problems solved by technology

However, based on the DC support method, not only the equipment is expensive, but also the battery has many disadvantages, such as short service life, heavy maintenance workload, slow charging speed, relatively large leakage current, chemical battery pollution, etc.

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