Anti-interference electricity system and control method based on SFCL (superconducting fault current limiter) and super capacitance energy storage

Abstract

The invention discloses an anti-interference electricity system based on SFCL (superconducting fault current limiter) and super capacitance energy storage. The system comprises an external power grid comprising a transformer and a load, and is characterized by comprising a voltage, a current detecting circuit, a signal modulating circuit, an A / D (analog-to-digital) sampling and converting module, a DSP (digital signal processor) control unit, a PWM (pulse-width modulation) driving unit, an SFCL unit and a super capacitance voltage compensating module; and a control method comprises the steps of signal detection, modulation, conversion, calculation and processing. The system has the advantages that firstly the hardware is simple and the software is easy to understand; secondly the system is high in reliability and rapidness; thirdly a large current and a low voltage of a power grid during the interference electricity are solved effectively; fourthly the success the anti-interference electricity rate of the equipment is increased; and fifthly the conversion speed is fast, the energy consumption is low, and the transmission in a high speed serial QSP1 mode is supported.

Description

(1) Technical field: [0001] The invention belongs to the field of power system protection, in particular to an anti-shake system and control method based on SFCL (Superconducting Fault Current Limiter) and supercapacitor energy storage. (two) background technology: [0002] The short-term failure of the power grid caused by lightning strikes, short-circuits or other reasons in the power supply system of large enterprises causes large voltage fluctuations, flicker, and even short-term power outages and recovery. Because the power load of large enterprises such as refining and petrochemical enterprises has high requirements on the quality of power supply, "Shaking Power" has a major impact on the normal operation of these enterprises. [0003] Most of the swaying electricity is caused by the short circuit of the line. When the short circuit occurs, the current of the line will become very large, and the voltage of the line will also drop significantly, which will have a great ...

AI Technical Summary

Problems solved by technology

[0003] Most of the swaying electricity is caused by the short circuit of the line. When the short circuit occurs, the current of the line will become very large, and the voltage of the line will also drop significantly, which will have a great impact or serious consequences on the production of the enterprise. In the slightest, some motors, frequency converters and contactors will trip or stop working, resulting in the interruption of enterprise production, and in severe cases, equipment accidents such as explosions and personal safety accidents will occur.

The anti-swaying devices currently in use generally have relatively simple hardware system functions. When the power supply system is swaying, passive preventive measures can only be taken on the secondary circuit of the power system, and the short-circuit current cannot be promptly corrected on the primary side of the power system at the same time. Limiting and effectively compensating for the drop voltage has led to many accidents in practice, which not only endangers the safe operation of the equipment, but also seriously affects the normal production

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