Supercapacitor energy storage uninterruptible power supply based on current transformer, and power supply method thereof

Abstract

The invention discloses a supercapacitor energy storage uninterruptible power supply based on a current transformer, which comprises the current transformer, a rectifying circuit, a reverse discharge protection diode D1, a forward discharge diode D2, a DC voltage conversion circuit, a bidirectional switch and a supercapacitor, wherein an output end of the rectifying circuit is connected with a bypass switch, a cathode of the forward discharge diode D2 is connected with an overvoltage protection sampling circuit, a charging voltage sampling circuit and a reference voltage circuit; an output end of the overvoltage protection sampling circuit is connected with an overvoltage control and drive circuit, an output end of the charging voltage sampling circuit is connected with a charge-discharge control and drive circuit, the bypass switch is connected with an output end of the overvoltage control and drive circuit, and the bidirectional switch is connected with an output end of the charge-discharge control and drive circuit. The invention further discloses a power supply method of the supercapacitor energy storage uninterruptible power supply based on the current transformer. The supercapacitor energy storage uninterruptible power supply can greatly increase energy utilization rate, the uninterruptible power supply method are simple in steps, and the supercapacitor energy storage uninterruptible power supply and the power supply method thereof are convenient popularization and use.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a super capacitor energy storage uninterruptible power supply based on a current transformer and a power supply method thereof. Background technique [0002] At present, the country puts forward higher requirements on the power quality of the electric energy transmitted by the power grid, and requires the power grid to have high reliability and safety. When a fault occurs in the line, it can be detected in time, and the fault information will be sent to the monitoring center, and the power maintenance personnel will be notified in time. Eliminate line faults and restore power operation. As a necessary facility for the safe operation of the power grid, the power grid fault detection device is used in every power grid company. The normal operation of the fault detection device requires a reliable and stable DC power supply. Currently, the DC power supply used fo...

AI Technical Summary

Problems solved by technology

[0003] Method (1) uses solar panels and batteries, which can meet the long-term work without external power supply, environmental protection and energy saving, but the size of the line fault detection device is greatly increased by the solar panels and batteries, and the conversion efficiency of solar panels It is greatly affected by factors such as weather, climate, and geography, and the battery itself has problems such as short service life, small charge and discharge current, overcharge and overdischarge cut-off protection circuits, and charge and discharge performance affected by temperature; method (2) takes The power scheme is suitable for high-voltage AC transmission lines of 110KV and above, and the grounding method adopts the operation mode of segmental insulation and one-point grounding, which has important application value for new lines and old technical transformation lines; method (3) requires that the area used has abundant solar energy and wind energy resources have great application potential in Qinghai, Tibet and other places; method (4) uses PT to take power, the voltage transformer is large in size, and the PT way of taking power is difficult to realize in a small space, and it is installed outdoors The PT is easily damaged by external force, and the safety of operation is affected

Moreover, the charge and discharge current of the battery is relatively small, and a charge and discharge current control circuit is required.

The power supply mode of PT combined with battery has problems such as large overall power supply volume, short service life of battery, and need to be replaced after a certain number of years of use; method (5) uses CT to take power, and the battery has a small charging and discharging current due to its own characteristics, which requires The charging and discharging current control circuit avoids damage to the battery due to excessive current, and the working voltage of the battery is narrow, so a battery charging and discharging voltage protection circuit must be added to ensure that the battery works within the allowable range

The power supply mode of CT with battery has disadvantages such as relatively complicated protection circuit, large device volume and inconvenient installation.

[0004] To sum up, the power supply methods of methods (1) to (5) have certain limitations and cannot well meet the actual use needs.

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