A control method and device for a permanent magnet operating mechanism of a pwm monostable vacuum circuit breaker

A technology of vacuum circuit breaker and permanent magnet operation, applied in high-voltage air circuit breaker, adaptive control, general control system, etc., can solve the problems of error must be within ±0.5ms, low suppression ability and so on
CN103236372BInactive Publication Date: 2015-11-18NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
Publication Date
2015-11-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a PWM (pulse width modulation) based monostable vacuum circuit breaker permanent magnetic operating mechanism control method and a device for implementing the same. Adjustments are performed through three closed loops including a contact position loop, a contact speed loop and a mechanism coil current loop. Exciting current is adjusted by the contact position loop according to the contact position. A PWM duty cycle is adjusted by the contact speed loop according to feedback signals of the contact position loop. Switch-on-off operations are controlled by the mechanism coil current in real-time according to the exciting current and the PWM duty cycle. A fuzzy PID (proportional integral derivative) controller is adopted in the contact position loop and the contact speed loop. PI (priority interrupt) control is adopted in the mechanism coil current loop. The PWM based monostable vacuum circuit breaker permanent magnetic operating mechanism control method has the advantages that synchronous operation capacity and reliability of the mechanism are improved; the main coil current detection and the auxiliary contact travel detection are cooperated with each other; and a pulse width modulation technology is adopted in operations of a circuit breaker, closed-loop control of contact movement features in the switch-on-off operations of the circuit breaker is realized through changing the coil current, stability of operation time is guaranteed, and accuracy of switch-on-off phases is improved.
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Description

Technical field

[0001] The invention relates to the field of electrical appliance automation control, and in particular to a method and a device for controlling a permanent magnet operating mechanism of a monostable vacuum circuit breaker based on PWM. Background technique

[0002] The operating phase of the traditional switch is random, and it is easy to generate a large inrush current and a high induced overvoltage when the power system is switched on and off, which leads to a reduction in the service life of the switch device and the power supply quality of the power system. Therefore, studying the intelligent control technology of the circuit breaker can not only ensure the reliability, stability and improve the power quality of the power supply, but also have important meanings to effectively improve the production efficiency of enterprises and the service life of equipment.

[0003] In principle, the synchronous closing and closing control technology can effectively weaken th...

Claims

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