CN203191750U - Control device of monostable vacuum circuit breaker permanent magnetic operation mechanism based on PWM - Google Patents
Control device of monostable vacuum circuit breaker permanent magnetic operation mechanism based on PWM Download PDFInfo
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- CN203191750U CN203191750U CN 201320161264 CN201320161264U CN203191750U CN 203191750 U CN203191750 U CN 203191750U CN 201320161264 CN201320161264 CN 201320161264 CN 201320161264 U CN201320161264 U CN 201320161264U CN 203191750 U CN203191750 U CN 203191750U
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Abstract
The utility model relates to a control device of a monostable vacuum circuit breaker permanent magnetic operation mechanism based on PWM comprising a microprocessor, an energy storage capacitor, a driving circuit, a current signal sampling circuit, a contact position detection circuit, a charging discharging control circuit, and a phase detection circuit. The energy storage capacitor and the driving circuit are respectively connected with a permanent magnetic mechanism. The current signal sampling circuit is communicated with the permanent magnetic mechanism, and the contact position detection circuit is communicated with a contact of a permanent magnetic operation mechanism circuit breaker. The driving circuit, the current signal sampling circuit, the contact position detection circuit, and the phase detection circuit are respectively communicated with the microprocessor. The control device is advantageous in that the synchronous operation capability and reliability of the mechanism can be improved; the closed loop control of the contact movement characteristic of the circuit breaker during switching on/off operation process can be realized by changing the coil current; the stability of the movement time can be guaranteed, and the accuracy of the switching on/off phase can be improved.
Description
Technical field
The utility model relates to electrical automation control field, relates in particular to a kind of monostable vacuum circuit breaker permanent-magnet manipulating mechanism control device based on PWM.
Background technology
The action phase place of traditional switch is at random, is easy to generate very big surge current and very high induced overvoltage when connection and disjunction electric system, causes the serviceable life of switchgear and the power supply quality of electric system to reduce.Therefore, the intelligent control technology of research isolating switch can either guarantee power supply reliability, stability and improve the quality of power supply, and to significance is arranged in serviceable life of the production efficiency of practical raising enterprise and equipment.
Close synchronously and close shoving and superpotential of producing when control technology can weaken circuit-breaker switching on-off on the principle effectively, its essence is that the dynamic and static contact of isolating switch is under the control of control system, close at the appointment phase angle place of power system voltage waveform and to close, make power equipments such as unloaded transformer, capacitor and nonloaded line under the situation to self and system shock minimum, drop into a kind of intelligent control technology of electric system.This technology is better than the method for traditional inhibition transient state process such as switching-on resistance, current-limiting reactor.But the mechanical system that traditional operating mechanism normally is made up of the gear train of complexity, run duration is dispersed big, and motion poor controllability, response speed are slow, thereby are difficult to realize the accurate control of mechanical motion.
The mechanical drive of vacuum circuit breaker permanent-magnet manipulating mechanism is simple, parts have only about 40% of spring operating mechanism, the magnetic field that the coil magnetization electric current produces directly drives moving iron core, moving iron core directly promotes the main shaft of vacuum circuit breaker and does the on/off switch motion, need not traditional machinery and thread off and latching system, this simple, the direct kind of drive makes that the branch wire time of permanent-magnet manipulating mechanism is stable and run duration is dispersed little.Therefore the vacuum circuit breaker permanent-magnet manipulating mechanism can satisfy the requirement that control technology is closed in synchronous pass aspect the degree of accuracy of branch wire time.But, because the environmental baseline difference will cause having dispersiveness the actuation time of vacuum circuit breaker, for example, the coercive force of permanent magnetic material is 850kA/m when normal temperature, and when temperature was 80 ℃, coercive force dropped to 750kA/m, and the direct result of generation is that the confining force of permanent magnet mechanism diminishes, resultant magnetic field density reduces, and then causes the closing time of isolating switch to change.Closing suppresses to shove depends primarily on the accuracy that phase place is closed in the isolating switch pass with superpotential effect and close synchronously, so control system needs the dispersiveness of actuation time is compensated.Traditional compensation method actuation time at present is control system by various influence factors being carried out online detection and calculating the numerical value that changes actuation time of being caused by them, to determine to send the moment of actuating signal, this kind method only can be with branch wire time error control at ± 2ms, the divide-shut brake phase error reaches ± 36o, but, close synchronously close control technology prerequisite of practicability in intelligent grid be close fashionable error must be in ± 0.5ms, so just might control the combined floodgate phase place, so lower with superpotential inhibition ability to shoving in the present control system actual motion more accurately.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of monostable vacuum circuit breaker permanent-magnet manipulating mechanism control device based on PWM is provided, and specifically has following technical scheme to realize:
The control device of described monostable vacuum circuit breaker permanent-magnet manipulating mechanism based on PWM, communicate to connect with the breaker permanent-magnet operating mechanism, comprise microprocessor, storage capacitor, driving circuit, the current signal sample circuit, the contact position testing circuit, discharge and recharge control loop and phase detecting circuit, described storage capacitor, driving circuit is connected with permanent magnet mechanism respectively, described current signal sample circuit and permanent magnet mechanism communicate to connect, the contact of described contact position testing circuit and permanent-magnet manipulating mechanism isolating switch communicates to connect, described driving circuit, the current signal sample circuit, contact position testing circuit and phase detecting circuit are connected with microprocessor communication respectively, described phase detecting circuit connects power supply, and the described control loop that discharges and recharges is connected with storage capacitor and microprocessor communication respectively.
The further design of described control device is, described phase detecting circuit is connected to form by voltage transformer (VT), operational amplifier, resistance and electric capacity, described voltage transformer (VT), electric capacity and a resistance are serially connected with the inverting input of described operational amplifier successively, the in-phase input end ground connection of operational amplifier.
The further design of described control device is, described current signal sample circuit, connected to form by Hall element, two operational amplifiers and resistance, described Hall element connects the in-phase input end of an operational amplifier, is connected with the in-phase input end of another operational amplifier again.
The further design of described control device is that described storage capacitor, driving circuit are connected with permanent magnet mechanism by a rectification circuit.
The further design of described control device is that described contact position testing circuit comprises a sensor and bus transceiver, and described sensor is connected with microprocessor communication by bus transceiver.
The further design of described control device is, the described control loop that discharges and recharges is connected with storage capacitor by magnetic bead and capacitance-resistance, comprise capacitance voltage testing circuit and divide-shut brake control circuit, described capacitance voltage testing circuit comprises operational amplifier and linear optical coupling, described linear optical coupling is connected in the in-phase end of operational amplifier, described divide-shut brake control circuit comprises insulated gate bipolar transistor and linear optical coupling, and described linear optical coupling is connected with storage capacitor and insulated gate bipolar transistor respectively.
Advantage of the present utility model is as follows:
Described synchronous operation ability and the reliability that has improved the vacuum circuit breaker permanent-magnet manipulating mechanism based on the monostable vacuum circuit breaker permanent-magnet manipulating mechanism control device of PWM, the present invention is based on the coil current detection, be auxilliary with the contact travel detection, the two cooperatively interacts, in the breaker operator process, adopt pulse modulation technology, by changing coil current, realization isolating switch branch, the closed-loop control of contact kinetic characteristic in the closing operation process, the stability of safety action time, improve the degree of accuracy of divide-shut brake phase place, final closing synchronously for realization closed control technology, suppressing effectively shoves lays the foundation with superpotential; The apparatus module division of labor simultaneously provided by the invention is clear and definite, and circuit is simple.
Description of drawings
Fig. 1 is based on the structural representation of the monostable vacuum circuit breaker permanent-magnet manipulating mechanism control device of PWM.
Fig. 2 is the synoptic diagram of described two-dimentional fuzzy controller.
Fig. 3 is described normal state type subordinate function synoptic diagram.
Fig. 4 is the circuit diagram of described phase detecting circuit.
Fig. 5 is the circuit diagram of described driving circuit.
Fig. 6 is the circuit diagram of described current signal sample circuit.
Fig. 7 is three closed-loop control synoptic diagram of described device.
Fig. 8 is the circuit diagram of described contact position testing circuit.
Fig. 9 is the described circuit diagram that discharges and recharges control loop.
Embodiment
Below in conjunction with accompanying drawing the utility model scheme is elaborated.
The control device based on the monostable vacuum circuit breaker permanent-magnet manipulating mechanism of PWM that the utility model provides, communicate to connect with the breaker permanent-magnet operating mechanism, comprise microprocessor, storage capacitor, driving circuit, the current signal sample circuit, the contact position testing circuit, discharge and recharge control loop and phase detecting circuit, storage capacitor, driving circuit is connected with permanent magnet mechanism by a rectification circuit, current signal sample circuit and permanent magnet mechanism communicate to connect, the contact of contact position testing circuit and permanent-magnet manipulating mechanism isolating switch communicates to connect, driving circuit, the current signal sample circuit, contact position testing circuit and phase detecting circuit are connected with microprocessor communication respectively, phase detecting circuit connects power supply, discharges and recharges control loop and is connected with storage capacitor and microprocessor communication respectively.In the present embodiment, microprocessor adopts TMS320F28335 DPS chip.
Phase detecting circuit is connected to form by voltage transformer (VT), operational amplifier, resistance and electric capacity.In the phase detecting circuit in the present embodiment, voltage transformer (VT) adopts TV1013-1M.Operational amplifier adopts LM385.This circuit is gathered in real time system voltage and is guaranteed that by sampling resistor R4 is set voltage magnitude is in DSP and receives in the amplitude range.The voltage signal of gathering is sent into the AD analog channel mouth of DSP, in DSP inside the signal of gathering is handled, and realizes the phase place of system voltage is accurately detected.Phase detecting circuit as shown in Figure 4.
The current signal sample circuit is connected to form by Hall element, two operational amplifiers and resistance, and Hall element connects the in-phase input end of an operational amplifier, is connected with the in-phase input end of another operational amplifier again.Traditional current signal sample circuit utilizes the mode of divider resistance more.This kind method is simple, but resistance can change because temperature is floated.Can't guarantee the precision measured.Simultaneously do not have electrical isolation between external circuit and the control circuit, very easily cause high voltage in the major loop to the counterattack of control loop, the safety of control system is constituted a threat to.Therefore in the current sampling circuit of present embodiment, employing can realize the Hall type current sensor CHF-400B of electrical isolation, and sensor output voltage becomes ratio with input current, and ratio is 1/100.Permanent-magnet manipulating mechanism is in carrying out the breaking-closing operating process, and coil current can change direction, but the input voltage range of A/D module is 0 ~ 3.3V among the DSP, so designed current signal sample circuit shown in Figure 6.
Select for use insulated gate bipolar transistor to do the switching device of circuit, when carrying out the combined floodgate order, DSP sends signal and drives T1 and T4 conducting; When carrying out the separating brake order, DSP sends signal and drives T2 and T3 conducting, in divide-shut brake moment, can produce very high back-pressure in the coil, therefore need continuous current circuit, the energy in the divide-shut brake coil is discharged, so designed continuous current circuit in driving circuit, after combined floodgate put in place, the electric current in the closing coil passed through D2, the D3 afterflow, energy in the release coil, after separating brake put in place, the electric current in the coil was by D1 and D4 afterflow, discharge the energy in the switching winding, driving circuit as shown in Figure 5.
Discharge and recharge control loop and be connected with storage capacitor by magnetic bead and capacitance-resistance, disturb to eliminate high frequency noise and spike, adopt ferrite bean in the present embodiment.Discharge and recharge control loop and comprise capacitance voltage testing circuit and divide-shut brake control circuit.The capacitance voltage testing circuit comprises operational amplifier and linear optical coupling, and linear optical coupling is connected in the in-phase end of operational amplifier.Present embodiment neutral line optocoupler is HCNR200, after controller powers on, at first the capacitor group is charged, DSP gathers the signal of capacitance voltage and handles, DSP sends and stops charging instruction when magnitude of voltage reaches systems operational requirement, cutting off extraneous power supply HCNR200 is operated under the photovoltage pattern, at first pass through divider resistance, condenser voltage is carried out voltage division processing, intercept out a part of voltage, and this voltage carried out after follower drives, give the primary side of linear optical coupling, after photoelectricity is isolated, export out voltage signal again by the secondary side of optocoupler, obtain magnitude of voltage on the capacitor thereby the A/D pin that at last voltage signal is transported to DSP carries out analog to digital conversion.The divide-shut brake control circuit comprises insulated gate bipolar transistor and linear optical coupling, and linear optical coupling is connected with storage capacitor and insulated gate bipolar transistor respectively.Send the divide-shut brake instruction by TMS320F28335, by the PWM waveform, the switch of insulated gate bipolar transistor in the control power tube drive circuit, and then the speed of control vacuum circuit breaker moving contact are realized the branch closing operation to vacuum circuit breaker.Discharge and recharge control loop according to the above-mentioned dynamic equation of setting based on the contact behavioral characteristics, upgrade PWM output sequential logic regulation and control storage capacitor, discharge, again this electric current is offered mechanism's coil.Simultaneously, the contact speed ring is adjusted the PWM dutycycle in real time according to the signal of contact position ring feedback, and mechanism's coil current is changed as requested, carries out the regulation and control of contact speed and finishes branch, closing operation.
The contact position testing circuit comprises a sensor and bus transceiver, and sensor is connected with microprocessor communication by bus transceiver.Present embodiment is selected SGC6T200 type grating sensor for use, and this type grating sensor output signal is Transistor-Transistor Logic level, useful range 200mm, zero-bit reference point of every 50mm.The grating sensor scope of testing the speed is 0 ~ 4.8m/s, resolution 0.005mm (grating space), can record more exactly vacuum circuit breaker minute, the dynamic speed of contact and position characteristic in the making process.Peripheral hardware receives the voltage signal of 3.3V in the sheet of TMS320F28335 DSP.But the output of grating chi sensor is the Transistor-Transistor Logic level signal of 5V.Because control system is had relatively high expectations to the speed/frequency of conversion, requiring to change power consumption simultaneously again can not be too big, considered the requirement of sensitivity, final decision adopts bus transceiver SN74LVCH245A as the level conversion device, realizes the conversion of the 3.3V level that the 5V input signal can receive to DSP.
In the device of monostable vacuum circuit breaker operating mechanism speed regulating control, differ distance between the effect of contact position ring minimizing three-phase contact, reduce asynchrony as far as possible.The effect of contact movement velocity ring suppresses the fluctuation of speed, guarantees the synchronism of three-phase contact divide-shut brake, is the major control link of system.In order to improve the dynamic and static characteristics of system, contact movement velocity regulator and contact position regulator adopt fuzzy control.Electric current loop makes electric current tightly follow the output of speed regulator, and the fluctuation of line voltage is played anti-interference effect.
Claims (6)
1. control device based on the monostable vacuum circuit breaker permanent-magnet manipulating mechanism of PWM, communicate to connect with the breaker permanent-magnet operating mechanism, it is characterized in that, comprise microprocessor, storage capacitor, driving circuit, the current signal sample circuit, the contact position testing circuit, discharge and recharge control loop and phase detecting circuit, described storage capacitor, driving circuit is connected with permanent magnet mechanism respectively, described current signal sample circuit and permanent magnet mechanism communicate to connect, the contact of described contact position testing circuit and permanent-magnet manipulating mechanism isolating switch communicates to connect, described driving circuit, the current signal sample circuit, contact position testing circuit and phase detecting circuit are connected with microprocessor communication respectively, described phase detecting circuit connects power supply, and the described control loop that discharges and recharges is connected with storage capacitor and microprocessor communication respectively.
2. control device according to claim 1, it is characterized in that, described phase detecting circuit is connected to form by voltage transformer (VT), operational amplifier, resistance and electric capacity, described voltage transformer (VT), electric capacity and a resistance are serially connected with the inverting input of described operational amplifier successively, the in-phase input end ground connection of operational amplifier.
3. control device according to claim 1, it is characterized in that, described current signal sample circuit, connected to form by Hall element, two operational amplifiers and resistance, described Hall element connects the in-phase input end of an operational amplifier, is connected with the in-phase input end of another operational amplifier again.
4. control device according to claim 1 is characterized in that, described storage capacitor, driving circuit are connected with permanent magnet mechanism by a rectification circuit.
5. control device according to claim 1 is characterized in that, described contact position testing circuit comprises a sensor and bus transceiver, and described sensor is connected with microprocessor communication by bus transceiver.
6. control device according to claim 1, it is characterized in that, the described control loop that discharges and recharges is connected with storage capacitor by magnetic bead and capacitance-resistance, comprise capacitance voltage testing circuit and divide-shut brake control circuit, described capacitance voltage testing circuit comprises operational amplifier and linear optical coupling, described linear optical coupling is connected in the in-phase end of operational amplifier, described divide-shut brake control circuit comprises insulated gate bipolar transistor and linear optical coupling, and described linear optical coupling is connected with storage capacitor and insulated gate bipolar transistor respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320161264 CN203191750U (en) | 2013-04-03 | 2013-04-03 | Control device of monostable vacuum circuit breaker permanent magnetic operation mechanism based on PWM |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320161264 CN203191750U (en) | 2013-04-03 | 2013-04-03 | Control device of monostable vacuum circuit breaker permanent magnetic operation mechanism based on PWM |
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| CN 201320161264 Expired - Fee Related CN203191750U (en) | 2013-04-03 | 2013-04-03 | Control device of monostable vacuum circuit breaker permanent magnetic operation mechanism based on PWM |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901786A (en) * | 2014-03-19 | 2014-07-02 | 温州大学 | Electronic controller of air circuit breaker |
| CN104113241A (en) * | 2014-07-11 | 2014-10-22 | 沈阳工业大学 | Control device and method of swing angle motor operating mechanism of high-voltage GIS (Gas Insulated Switchgear) isolating switch |
-
2013
- 2013-04-03 CN CN 201320161264 patent/CN203191750U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901786A (en) * | 2014-03-19 | 2014-07-02 | 温州大学 | Electronic controller of air circuit breaker |
| CN104113241A (en) * | 2014-07-11 | 2014-10-22 | 沈阳工业大学 | Control device and method of swing angle motor operating mechanism of high-voltage GIS (Gas Insulated Switchgear) isolating switch |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20160403 |