CN107994545A - The protection circuit and electric system of a kind of wind turbine - Google Patents
The protection circuit and electric system of a kind of wind turbine Download PDFInfo
- Publication number
- CN107994545A CN107994545A CN201711317602.XA CN201711317602A CN107994545A CN 107994545 A CN107994545 A CN 107994545A CN 201711317602 A CN201711317602 A CN 201711317602A CN 107994545 A CN107994545 A CN 107994545A
- Authority
- CN
- China
- Prior art keywords
- circuit
- wind turbine
- frequency converter
- resistor
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Abstract
The invention discloses the protection circuit and electric system of a kind of wind turbine; the circuit includes the control circuit being arranged between wind turbine and power supply, the Acquisition Circuit being connected with current supply circuit, the comparison circuit being connected with Acquisition Circuit, for comparing actual signal and preset signals and obtaining comparative result.Comparison circuit also with wind turbine frequency converter in systems and control circuit be connected and comparative result be transmitted to frequency converter and control circuit, control circuitry cuts wind turbine and power supply, frequency converter to do respective handling when comparative result is abnormal.Comparative result can be transmitted to frequency converter by the comparison circuit in this protection circuit; equivalent to can output alarm signal, and frequency converter is the original frequency converter of system where wind turbine, therefore; the extra hardware i.e. achievable protection to wind turbine need not be increased, cost is relatively low.Further, since Acquisition Circuit collection be current supply circuit actual signal, therefore, be not easy to be influenced by the temperature of the working environment of wind turbine, reliability is higher, and versatility is also stronger.
Description
Technical field
The present invention relates to current protection technology field, more particularly to the protection circuit and electric system of a kind of wind turbine.
Background technology
Heavy-duty motor has larger fever in operation, therefore motor needs to carry out radiating treatment in itself.It is general big
The wind turbine of heat transmission is installed on power motor shell, is rotated by wind turbine to motor radiating.The safe operation of wind turbine is to ensure
The precondition of heavy-duty motor normal operation, when wind turbine appearance exception, such as during overcurrent, may cause wind turbine not turn
It is dynamic, in turn result in heavy-duty motor heat dissipation and go wrong.
In the prior art, electrothermal relay is installed on wind turbine and realizes overcurrent protection, its principle is that electrothermal relay utilizes wind turbine
Fever allows shrapnel deformation to cause relay to disconnect during overcurrent.But since the running environment of each wind turbine is widely different, working environment
Temperature height can cause the setting of over-current protection point larger uncertain factor, and electrothermal relay in itself only protects overcurrent
Protect, can not direct output alarm signal under abnormal conditions.Therefore for whole system, the protective effect of electrothermal relay, which has, compares
Obvious limitation.
In addition, Small-power Inverter can be used to reach air-blower control using Frequency Converter Control in the prior art
To good effect.But the requirement to control performance is very low in itself for wind turbine, if wind turbine keeps certain air output, and generally
Power of fan it is smaller can direct start-stop, the cost of system can be greatly increased using special converter driving wind turbine, practicality is not
It is high.
It can be seen from the above that how overcurrent protection of the realization of high reliability to wind turbine is that those skilled in the art are urgently to be resolved hurrily
Problem.
The content of the invention
The object of the present invention is to provide the protection circuit and electric system of a kind of wind turbine, the realization for high reliability is to wind
The overcurrent protection of machine.
In order to solve the above technical problems, the present invention provides a kind of protection circuit of wind turbine, including it is arranged on wind turbine and power supply
Between control circuit, for controlling the break-make of the wind turbine and power supply, being connected with the current supply circuit, for gathering the confession
The Acquisition Circuit of the actual signal of electrical circuit, the comparison circuit being connected with the Acquisition Circuit, for the actual signal
With preset signals and obtaining comparative result；
Wherein, the comparison circuit also with the wind turbine frequency converter in systems be connected so that the comparative result to be passed
Transport to the frequency converter, the comparison circuit also with the wind turbine frequency converter in systems and the control circuit be connected
The comparative result is transmitted to the frequency converter and the control circuit, the control circuit when the comparative result is abnormal
The wind turbine and the power supply are cut off, the frequency converter does respective handling.
Preferably, the control circuit specifically includes nor gate and relay；
Wherein, the first input end of the nor gate is connected with the control terminal of the frequency converter, and the second of the nor gate
Input terminal is connected with the comparison circuit, and the output terminal of the nor gate is connected with the coil of the relay, the relay
Contact be arranged between the wind turbine and the power supply.
Preferably, the power supply is power frequency supply, it is described protection circuit further include be arranged on the Acquisition Circuit with it is described
Starting current interference filter circuit between comparison circuit；
The starting current interference filter circuit specifically includes phase inverter, diode, first resistor, second resistance, the 3rd
Resistance, capacitance, switching tube；
Wherein, the input terminal of the phase inverter is connected with the output terminal of the nor gate, the output terminal of the phase inverter with
The anode connection of the diode, the cathode of the diode and first end, the first end of the capacitance of the first resistor
And the control terminal of the switching tube is all connected with, the second end of the first resistor, the second end of the capacitance, the switching tube
Second end and the second end of the second resistance be all connected with, the first of the first end of the 3rd resistor and the second resistance
End is connected with the input terminal of the comparison circuit and the Acquisition Circuit, the second end of the 3rd resistor and the switching tube
Second end connection, the switching tube is held in the contact closure of the relay, and is disconnected after preset time, institute
Preset time is stated specifically to be determined by the parameter of the first resistor and the capacitance.
Preferably, the Acquisition Circuit specifically includes three current transformers, respectively with each phase of the power frequency supply
Connection.
Preferably, the rectification circuit being additionally included between the Acquisition Circuit and the starting current interference filter circuit,
The input terminal of the rectification circuit is connected with the output terminal of the current transformer, the output terminal of the rectification circuit and described the
The first end of three resistance is connected with the first end of the second resistance.
Preferably, the comparison circuit specifically includes voltage comparator and latch；
Wherein, the first end of the in-phase input end of the voltage comparator and the 3rd resistor and the second resistance
First end connects, the inverting input input datum of the voltage comparator, the output terminal of the voltage comparator and institute
The input terminal connection of latch is stated, the output terminal of the latch is connected with the second end of the nor gate.
Preferably, the rectification circuit is specially six pulse wave rectifier circuit of three-phase.
Preferably, the switching tube is specially NMOS, the control terminal of the grid of the NMOS as the switching tube, described
First end of the drain electrode as the switching tube of NMOS, the second end of the source electrode of the NMOS as the switching tube.
Preferably, the latch is specially rest-set flip-flop, the input of the S ends of the rest-set flip-flop as the latch
End, the R ends of the rest-set flip-flop are connected as reset terminal, and with the control terminal of the frequency converter, and the Q ends of the rest-set flip-flop are made
For the output terminal of the latch.
In order to solve the above technical problems, the present invention also provides a kind of electric system, including motor, the control motor operation
Frequency converter and be arranged on the wind turbine for being used to radiate at the motor, further include the protection circuit of wind turbine described above.
The protection circuit and electric system of wind turbine provided by the present invention, the protection circuit, including it is arranged on wind turbine and electricity
Control circuit between source, for controlling the break-make of wind turbine and power supply, being connected with current supply circuit, for gathering the reality of current supply circuit
The Acquisition Circuit of border signal, the comparison circuit being connected with Acquisition Circuit, for comparing actual signal and preset signals and being compared
Relatively result.Wherein, comparison circuit also with wind turbine frequency converter in systems and control circuit be connected and transmit comparative result
To frequency converter and control circuit, circuitry cuts wind turbine and power supply, frequency converter is controlled to do respective handling when comparative result is abnormal.By
This is as it can be seen that comparative result can be transmitted to frequency converter by the comparison circuit in this protection circuit, equivalent to can export alarm signal
Number, and frequency converter is the wind turbine place original frequency converter of system, therefore, there is no need to, which increases extra hardware, can be achieved to wind turbine
Protection, cost is relatively low.Further, since Acquisition Circuit collection be current supply circuit actual signal, therefore, be not easy by wind turbine
The temperature of working environment influences, and reliability is higher, and versatility is also stronger.Finally, due to frequency converter directly controls motor,
When determining blowing machine exception, motor stopping can be directly controlled, it is not necessary to the transmission of external signal so that motor can stop in time
Machine, avoids the problem that causing to radiate bad.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly, attached drawing needed in the embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, without creative efforts, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is a kind of structure chart of the protection circuit of wind turbine provided in an embodiment of the present invention；
Fig. 2 is a kind of circuit diagram of specific protection circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of connection diagram for protecting circuit and frequency converter provided in an embodiment of the present invention；
Fig. 4 is a kind of structure chart of electric system provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, without making creative work, what is obtained is every other by those of ordinary skill in the art
Embodiment, belongs to the scope of the present invention.
The core of the present invention is to provide the protection circuit and electric system of a kind of wind turbine, and the realization for high reliability is to wind
The overcurrent protection of machine.
In order to make those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 1 is a kind of structure chart of the protection circuit of wind turbine provided in an embodiment of the present invention.As shown in Figure 1, the protection is electric
Road, including the control circuit 12 being arranged between wind turbine 10 and power supply 11, for controlling the break-make of wind turbine 10 and power supply 11, with supplying
Electrical circuit connects, the Acquisition Circuit 13 of the actual signal for gathering current supply circuit, the comparison circuit being connected with Acquisition Circuit 13
14, for comparing actual signal and preset signals and obtaining comparative result.
Wherein, comparison circuit 14 also with wind turbine 10 frequency converter 15 in systems and control circuit 12 connect will compared with
As a result frequency converter 15 and control circuit 12 are transmitted to, when comparative result is abnormal, control circuit 12 cuts off wind turbine 10 and power supply 11,
Frequency converter 15 does respective handling.
In a particular embodiment, the system where wind turbine 10 includes motor, and motor is high power device, in the process of running
Larger heat can be produced, if heat distributes not in time, cause motor can not normal operation, or even burn, therefore, in order to protect
The normal operation of motor is demonstrate,proved, wind turbine 10 is set typically around motor, by the rotation of wind turbine 10, accelerates motor radiating.
In motor operation course, once wind turbine 10 breaks down, then the normal operation of motor just can not ensure, how understand wind turbine in time
10 operating status is the premise of guarantee system reliability service.
The effect of control circuit 12 is that wind turbine 10 is connected or broken with power supply 11 by the comparative result of foundation comparison circuit 14
Open, in specific implementation, control circuit 12 can be the circuit comprising switch, such as breaker, relay etc., under concrete structure
Text will be described in.
In the process of running, most direct phenomenon is exactly that the signal in current supply circuit occurs to wind turbine 10 if there is exception
It is abnormal, for example, overcurrent, overvoltage etc., therefore, in the present embodiment, the reality on current supply circuit are gathered by Acquisition Circuit 13
Signal, then compared with preset signals, so as to judge whether actual signal is normal.It is understood that actual signal can
Think voltage signal or current signal, naturally it is also possible to be temperature signal etc., corresponding, preset signals can be that voltage is believed
Number, current signal or temperature signal.
The concrete structure of Acquisition Circuit 13 needs to determine according to the type of acquisition target, if for example, the actual letter of collection
Number be current supply circuit in voltage signal, then Acquisition Circuit 13 can include voltage sensor；If the actual signal of collection is
Current signal in current supply circuit, then Acquisition Circuit 13 can include current sensor；If the actual signal of collection is power supply
Temperature signal in circuit, then Acquisition Circuit 13 can include temperature sensor, in short, the concrete structure of Acquisition Circuit 13 can be with
It is set according to actual conditions, the present embodiment is not construed as limiting.Due to Acquisition Circuit 13 gather be current supply circuit actual signal, because
This, for the temperature signal of working environment for gathering wind turbine in the prior art, is not easy to be influenced by the temperature of working environment,
Reliability is higher, and versatility is also stronger.
The concrete structure of comparison circuit 14 can use voltage comparator or operational amplifier etc., can be according to actual letter
Number type and the types of preset signals determine.The effect of comparison circuit 14 is to compare the size of actual signal and preset signals,
So that it is determined that whether actual signal is abnormal.In 10 operation exception of wind turbine, the comparative result of comparison circuit 14 is equivalent to report
Alert signal, just directly can determine whether wind turbine 10 is abnormal by the result.
Comparison circuit 14 exports comparative result to the frequency converter 15 of 10 place system of wind turbine, frequency converter 15 to be compared according to this
As a result it can determine whether blowing machine 10 is abnormal.Further, since frequency converter 15 directly controls motor operation, work as frequency conversion
Device 15 determines that blowing machine 10 is abnormal, then motor stopping can be controlled to run, so as to avoid that wind turbine 10 is shut down and motor is still run
The problem of.In summary, it is not necessary to which extra increase Small-power Inverter is to air-blower control, it is possible to while control wind turbine 10 and electricity
The operation of machine, reduces cost, moreover, frequency converter 15 functionally only increases the comparison knot for receiving comparison circuit
Fruit, will not impact the control logic of frequency converter in itself, meanwhile, for the additionally scheme of increase hardware,
In the case of comparative result exception, it is also necessary to communicate with frequency converter, frequency converter controls the mode of motor stopping again, this programme
Timeliness higher, and it is more reliable.
The protection circuit of wind turbine provided in this embodiment, including the control circuit being arranged between wind turbine and power supply, are used for
The break-make of control wind turbine and power supply, be connected with current supply circuit, the Acquisition Circuit of the actual signal for gathering current supply circuit, with adopting
The comparison circuit of collector connection, for comparing actual signal and preset signals and obtaining comparative result.Wherein, comparison circuit is also
With wind turbine frequency converter in systems be connected so that comparative result is transmitted to frequency converter, frequency converter is in comparative result exception time control
Control circuit processed disconnects the connection of wind turbine and power supply.It can be seen from the above that the comparison circuit in this protection circuit can be by comparative result
Be transmitted to frequency converter, equivalent to can output alarm signal, and frequency converter is the original frequency converter of system where wind turbine, therefore,
The extra hardware i.e. achievable protection to wind turbine need not be increased, cost is relatively low.Further, since Acquisition Circuit collection is to supply
The actual signal of electrical circuit, therefore, is not easy to be influenced by the temperature of the working environment of wind turbine, reliability is higher, and versatility is also stronger.
Finally, due to which frequency converter directly controls motor, when definite blowing machine is abnormal, motor stopping can be directly controlled, is not required to
Want the transmission of external signal so that motor can be shut down in time, avoid the problem that causing to radiate bad.
Fig. 2 is a kind of circuit diagram of specific protection circuit provided in an embodiment of the present invention.It is understood that Fig. 2
A kind of specific application scenarios, those skilled in the art on the premise of this programme is obtained, by it is therein some or it is a few
A device is simply replaced, and need not be made the creative labor, still within the scope of the present invention.Such as Fig. 2 institutes
Show, on the basis of above-described embodiment, preferably embodiment, control circuit 12 specifically include nor gate U3 and relay
Device.
Wherein, the control terminal CTRL connections of the first input end of nor gate U3 and frequency converter, the second input of nor gate U3
End is connected with comparison circuit 14, the coil connection of the output terminal of nor gate U3 and relay, the contact of relay (RLY1, RLY2,
RLY3) it is arranged between wind turbine 10 and power supply 11.
As shown in Fig. 2, two input terminals of nor gate U3 connect the control terminal CTRL and comparison circuit of frequency converter 15 respectively
14 output terminal, control terminal CTRL is effective using low level, when control terminal CTRL provides high level signal, then be based on or
The logic of NOT gate U3, its output terminal are low level, and the contact of relay is disconnected in low level, therefore, as long as control terminal CTRL
High level is provided, then the contact of relay is off-state, and wind turbine 10 is disconnected with power supply 11, and wind turbine 10 is in shutdown status.
When two input terminals of nor gate U3 are low level signal, its output terminal output high level signal so that the contact of relay
For on-state, wind turbine 10 is connected with power supply 11, and wind turbine 10 is in operating status.
In above-described embodiment, power supply 11 can be any form of power supply, and in specific implementation, wind turbine 10 is usually used
Power supply is power frequency supply, and under this kind of operating mode, wind turbine 10, which starts moment, a larger current, and the electric current in current supply circuit is typically volume
6-8 times of definite value, the starting current duration is shorter, and the time is typically smaller than 1S.Accident in view of reducing false triggering, this implementation
In example, for the power supply mode of power frequency supply, starting current interference filter circuit 16 is added.As shown in Fig. 2, as a kind of excellent
Selection of land embodiment, power supply 11 are power frequency supply, and protection circuit, which further includes, to be arranged between Acquisition Circuit 13 and comparison circuit 14
Starting current interference filter circuit 16.
Starting current interference filter circuit 16 specifically includes phase inverter U4, diode D1, first resistor R1, second resistance
R2,3rd resistor R3, capacitance C1, switching tube Q1；
Wherein, the output terminal connection of the input terminal AND OR NOT gate U3 of phase inverter U4, the output terminal and diode of phase inverter U4
The anode connection of D1, the cathode of diode D1 and the first end of first resistor R1, the first end of capacitance C1 and switching tube Q1
Control terminal is all connected with, the second end of first resistor R1, the second end of capacitance C1, the second end of switching tube Q1 and second resistance R2
Second end is all connected with, and the first end of 3rd resistor R3 and the first end of second resistance R2 are with the input terminal of comparison circuit 14 and adopting
Collector 13 connects, and the second end of 3rd resistor R3 is connected with the second end of switching tube Q1, and switching tube Q1 is in the contact of relay
Closure moment is held on, and is disconnected after preset time, and preset time is specifically determined by the parameter of first resistor and capacitance.
As shown in Fig. 2, switching tube Q1 in addition to metal-oxide-semiconductor, can also be IGBT, or triode, Fig. 2 are a kind of specific
Application scenarios, do not represent and there was only a kind of this embodiment, other types of switching tube, the present embodiment repeats no more.Fig. 2
In, switching tube Q1 is specially NMOS, and the control terminal of the grid of NMOS as switching tube Q1, the drain electrode of NMOS is as switching tube Q1's
First end, the second end of the source electrode Q1 of NMOS as switching tube.As shown in Fig. 2, to specifically include three electric currents mutual for Acquisition Circuit 13
Sensor T1, T2, T3, are connected with each of power frequency supply respectively.
1) before fan operation
When the control terminal CTRL of frequency converter 15 provides high level signal (no matter which kind of level signal comparison circuit 14 is), or
The output terminal output low level signal of NOT gate U3 so that the contact of relay disconnects, and wind turbine 10 is in shutdown status.Due to or
The output terminal of NOT gate U3 is low level signal, and by being high level signal after phase inverter U4, electric current is flowed into by diode D1
The current potential of output terminal of the current potential equal to phase inverter U4 on first resistor R1 and capacitance C1, final capacitance C1 so that switching tube Q1
Conducting.
2) when wind turbine starts
When the control terminal CTRL of frequency converter 15 provides low level signal, and comparison circuit 14 also exports low level signal,
The output terminal output high level signal of nor gate U3 so that the contact of relay closes, and wind turbine 10 brings into operation.Wind turbine 10 with
While power supply 11 is connected, the output of phase inverter U4 is changed into low level signal from high level signal before, is closed in relay
Moment, due to the effect of capacitance C1, the grid of Q1 and the voltage at source electrode both ends are still maintained as high level, then Q1, which is still maintained, leads
Logical state.Since Q1 is turned on, the actual signal of sample circuit 13 passes through second resistance R2 and 3rd resistor R3 at the same time, so output
Need very high current to trigger over-current signal, in other words, even if starting current is very big, load at second resistance R2 both ends
Voltage will not be excessive, and comparison circuit 14 compares the size of the signal and preset signals, determines that the signal is less than default letter at this time
Number, wind turbine 10 is in normal operating condition, for frequency converter 15, does not receive the abnormal signal of wind turbine 10, then keeps control
End CTRL processed is low level signal.Thus excessive it can cause showing for false triggering to avoid the starting current for the moment wind turbine 10 that closes a floodgate
As.
Since diode D1 ends after relay closure, the electric charge on capacitance C1 can only be released by first resistor R1, when
When capacitance C1 voltages are reduced to below the conducting voltage of Q1, Q1 shut-offs.After Q1 shut-offs, the actual signal of wind turbine 10 is only added in second
On resistance R2, therefore required overcurrent protection trigger signal can become normal level.The ON time of Q1 by first resistor R1 and
Capacitance C1 is determined, can adjust the resistance value of first resistor R1 and the capacitance of capacitance C1 to adjust the time of shielding starting current.
As shown in Fig. 2, it is whole between Acquisition Circuit 13 and starting current interference filter circuit 16 to protect circuit to be additionally included in
Current circuit 17, the input terminal of rectification circuit 17 are connected with the output terminal of current transformer T1, T2, T3, the output of rectification circuit 17
End is connected with the first end of 3rd resistor R3 and the first end of second resistance R2.Preferably embodiment, rectification circuit 17
Specially six pulse wave rectifier circuit of three-phase.It is understood that six pulse wave rectifier circuit of three-phase is one kind of rectification circuit 17
Concrete form, does not represent and there was only a kind of this form.
On the basis of above-described embodiment, comparison circuit 14 specifically includes voltage comparator U1 and latch U2；
Wherein, the in-phase input end of voltage comparator U1 and the first end of 3rd resistor R3 and the first end of second resistance R2
Connection, voltage comparator U1 inverting input input datum Vth (preset signals), the output terminal of voltage comparator U1 with
The input terminal connection of latch U2, the second end connection of the output terminal AND OR NOT gate U3 of latch U2.
Preferably, latch U2 is specially rest-set flip-flop, and the input terminal of the S ends of rest-set flip-flop as latch U2, RS is touched
The R ends of hair device are connected as reset terminal, and with the control terminal CTRL of frequency converter 15, and the Q ends of rest-set flip-flop are as the defeated of latch
Outlet.
In Fig. 2, latch U2 illustrates by taking rest-set flip-flop as an example, (the control terminal of frequency converter 15 at this time after relay closure
CTRL outputs are low level signal), when overcurrent occurs for circuit, the magnitude of voltage of actual signal (voltages at second resistance R2 both ends) is big
In the magnitude of voltage of preset signals, voltage comparator U1 exports high level signal to the input terminal S of rest-set flip-flop, triggers rest-set flip-flop
Output terminal Q saltus steps be high level signal so that the signal of the second input terminal of nor gate U3 is also changed into high level signal, due to
The presence of nor gate U3 so that the output terminal of nor gate U3 is changed into low level, then relay disconnects, fan parking.Frequency converter 15
It is connected with the output terminal of comparison circuit 14, then frequency converter 15 also receives high level signal.
After overcurrent triggering, the signal of current transformer T1-T3 is " 0 ", then the output terminal of voltage comparator U1 is changed into low
Level, but since rest-set flip-flop latch signal exists so that the second input terminal of nor gate U3 is high level signal, then or non-
The output terminal of door U3 keeps low level signal, therefore the control signal to relay after cut-out exports can be automatically kept as low electricity
Flat, wind turbine 10 is in shutdown status.
For frequency converter 15, after OC ends are received as high level signal, respective handling can be done, such as alarm carries
Show, cut off connection of motor and power supply etc..When being again started up, high level is first provided by the control terminal CTRL of frequency converter 15 and is believed
Number so that latch U2 resets, and after reset, control terminal CTRL provides low level signal again, so that allow relay to close again,
Wind turbine 10 is run again.
In order to allow those skilled in the art more to understand the state of wind turbine control signal under each operating status in the present invention
Change, provides table 1.
Table 1
Fig. 3 is a kind of connection diagram for protecting circuit and frequency converter provided in an embodiment of the present invention.As shown in figure 3, protect
Protection circuit is connected with the common port COM of frequency converter 15, protects the power supply of the component in circuit to pass through the 24V electricity on frequency converter 15
Source powers, and the control terminal CTRL on frequency converter 15 is connected with the second input terminal of the nor gate U3 in protection circuit, frequency converter 15
Upper OC ends are connected with the second input terminal of the nor gate U3 in protection circuit.
In above-described embodiment, the detailed description of the protection circuit progress for wind turbine provided by the invention, the present invention also carries
For a kind of electric system for including the protection circuit.Fig. 4 is a kind of structure chart of electric system provided in an embodiment of the present invention.Such as
Shown in Fig. 4, electric system includes motor 30, the frequency converter 15 for controlling motor operation and is arranged at motor 30 to be used for what is radiated
Wind turbine 10, further includes the protection circuit of wind turbine described above.
The protection circuit of wind turbine provided in this embodiment, including the control circuit being arranged between wind turbine and power supply, are used for
The break-make of control wind turbine and power supply, be connected with current supply circuit, the Acquisition Circuit of the actual signal for gathering current supply circuit, with adopting
The comparison circuit of collector connection, for comparing actual signal and preset signals and obtaining comparative result.Wherein, comparison circuit is also
With wind turbine frequency converter in systems be connected comparative result be transmitted to frequency converter, frequency converter is in comparative result exception time control
Control circuit processed disconnects the connection of wind turbine and power supply.It can be seen from the above that the comparison circuit in this protection circuit can be by comparative result
Be transmitted to frequency converter, disconnected by Frequency Converter Control wind turbine and power supply, equivalent to can output alarm signal, and frequency converter is wind
The original frequency converter of system where machine, therefore, there is no need to increase the extra hardware i.e. achievable protection to wind turbine, cost compared with
It is low.Further, since Acquisition Circuit collection be current supply circuit actual signal, therefore, be not easy the temperature of the working environment by wind turbine
Degree influences, and reliability is higher, and versatility is also stronger.Finally, due to frequency converter directly controls motor, it is different in definite blowing machine
Chang Shi, can directly control motor stopping, it is not necessary to the transmission of external signal so that motor can be shut down in time, avoid causing
Radiate the problem of bad.
The protection circuit to wind turbine provided by the present invention and electric system are described in detail above.It is each in specification
A embodiment is described by the way of progressive, and what each embodiment stressed is the difference with other embodiment, respectively
Between a embodiment identical similar portion mutually referring to.For device disclosed in embodiment, due to itself and embodiment
Disclosed method is corresponding, so description is fairly simple, reference may be made to the description of the method.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvement and modification, these are improved and modification is also fallen into the protection domain of the claims in the present invention.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there are other identical element in the process, method, article or apparatus that includes the element.
Claims (10)
1. the protection circuit of a kind of wind turbine, it is characterised in that including the control circuit being arranged between wind turbine and power supply, for controlling
Make the break-make of the wind turbine and power supply, be connected with the current supply circuit, the actual signal for gathering the current supply circuit is adopted
Collector, the comparison circuit being connected with the Acquisition Circuit, compared with for the actual signal and preset signals and obtaining
As a result；
Wherein, the comparison circuit also with the wind turbine frequency converter in systems and the control circuit be connected with will described in
Comparative result is transmitted to the frequency converter and the control circuit, the control circuit cut-out institute when the comparative result is abnormal
Wind turbine and the power supply are stated, the frequency converter does respective handling.
2. the protection circuit of wind turbine according to claim 1, it is characterised in that the control circuit specifically includes nor gate
And relay；
Wherein, the first input end of the nor gate is connected with the control terminal of the frequency converter, the second input of the nor gate
End is connected with the comparison circuit, and the output terminal of the nor gate is connected with the coil of the relay, and the relay touches
Point is arranged between the wind turbine and the power supply.
3. the protection circuit of wind turbine according to claim 2, it is characterised in that the power supply is power frequency supply, the guarantor
Protection circuit further includes the starting current interference filter circuit being arranged between the Acquisition Circuit and the comparison circuit；
The starting current interference filter circuit specifically include phase inverter, diode, first resistor, second resistance, 3rd resistor,
Capacitance, switching tube；
Wherein, the input terminal of the phase inverter is connected with the output terminal of the nor gate, the output terminal of the phase inverter with it is described
The anode connection of diode, the first end of the cathode of the diode and the first resistor, the first end of the capacitance and
The control terminal of the switching tube is all connected with, the second end of the first resistor, the second end of the capacitance, the of the switching tube
The second end of two ends and the second resistance is all connected with, and the first end of the 3rd resistor and the first end of the second resistance are equal
It is connected with the input terminal of the comparison circuit and the Acquisition Circuit, the of the second end of the 3rd resistor and the switching tube
Two ends connect, and the switching tube is held in the contact closure of the relay, and is disconnected after preset time, described pre-
If the time is specifically determined by the parameter of the first resistor and the capacitance.
4. the protection circuit of wind turbine according to claim 3, it is characterised in that the Acquisition Circuit specifically includes three electricity
Current transformer, is connected with each of the power frequency supply respectively.
5. the protection circuit of wind turbine according to claim 3, it is characterised in that be additionally included in the Acquisition Circuit and described
Rectification circuit between starting current interference filter circuit, the output of the input terminal of the rectification circuit and the current transformer
End connection, the output terminal of the rectification circuit are connected with the first end of the 3rd resistor and the first end of the second resistance.
6. the protection circuit of the wind turbine according to claim 3-5 any one, it is characterised in that the comparison circuit is specific
Including voltage comparator and latch；
Wherein, the first of the first end and the second resistance of the in-phase input end of the voltage comparator and the 3rd resistor
End connection, the inverting input input datum of the voltage comparator, the output terminal of the voltage comparator and the lock
The input terminal connection of storage, the output terminal of the latch are connected with the second end of the nor gate.
7. the protection circuit of wind turbine according to claim 5, it is characterised in that the rectification circuit is specially six arteries and veins of three-phase
Ripple rectification circuit.
8. the protection circuit of wind turbine according to claim 3, it is characterised in that the switching tube is specially NMOS, described
Control terminal of the grid of NMOS as the switching tube, the first end to drain as the switching tube of the NMOS are described
Second end of the source electrode of NMOS as the switching tube.
9. the protection circuit of wind turbine according to claim 6, it is characterised in that the latch is specially rest-set flip-flop,
Input terminal of the S ends of the rest-set flip-flop as the latch, the R ends of the rest-set flip-flop as reset terminal, and with it is described
The control terminal connection of frequency converter, the output terminal of the Q ends of the rest-set flip-flop as the latch.
10. a kind of electric system, including the frequency converter of motor, the control motor operation and being arranged at the motor is used for
The wind turbine of heat dissipation, it is characterised in that further include the protection circuit of the wind turbine described in claim 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711317602.XA CN107994545B (en) | 2017-12-12 | 2017-12-12 | A kind of the protection circuit and electric system of blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711317602.XA CN107994545B (en) | 2017-12-12 | 2017-12-12 | A kind of the protection circuit and electric system of blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107994545A true CN107994545A (en) | 2018-05-04 |
| CN107994545B CN107994545B (en) | 2019-07-30 |
Family
ID=62037225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711317602.XA Active CN107994545B (en) | 2017-12-12 | 2017-12-12 | A kind of the protection circuit and electric system of blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107994545B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429566A (en) * | 2019-08-19 | 2019-11-08 | 广东美的制冷设备有限公司 | Blower current-limiting circuit and equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130849Y (en) * | 2007-12-17 | 2008-10-08 | 南通三九焊接机器制造有限公司 | Abnormal condition protected unit system for wind cooling system |
| CN101710694A (en) * | 2009-11-26 | 2010-05-19 | 上海大学 | Car engine cooling fan blocking/overcurrent protection system and method |
| CN203233141U (en) * | 2013-03-13 | 2013-10-09 | 中国石油天然气股份有限公司 | Independent cooling fan interlocking protection device of variable-frequency motor |
| CN106452200A (en) * | 2016-11-22 | 2017-02-22 | 广东美的暖通设备有限公司 | Typhoon power protection circuit of outdoor fan in air conditioner, outdoor unit and air conditioner |
| CN206225995U (en) * | 2016-11-22 | 2017-06-06 | 广东美的暖通设备有限公司 | The typhoon power protecting circuit of outdoor fan, outdoor unit and air-conditioner in air-conditioner |
-
2017
- 2017-12-12 CN CN201711317602.XA patent/CN107994545B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130849Y (en) * | 2007-12-17 | 2008-10-08 | 南通三九焊接机器制造有限公司 | Abnormal condition protected unit system for wind cooling system |
| CN101710694A (en) * | 2009-11-26 | 2010-05-19 | 上海大学 | Car engine cooling fan blocking/overcurrent protection system and method |
| CN203233141U (en) * | 2013-03-13 | 2013-10-09 | 中国石油天然气股份有限公司 | Independent cooling fan interlocking protection device of variable-frequency motor |
| CN106452200A (en) * | 2016-11-22 | 2017-02-22 | 广东美的暖通设备有限公司 | Typhoon power protection circuit of outdoor fan in air conditioner, outdoor unit and air conditioner |
| CN206225995U (en) * | 2016-11-22 | 2017-06-06 | 广东美的暖通设备有限公司 | The typhoon power protecting circuit of outdoor fan, outdoor unit and air-conditioner in air-conditioner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429566A (en) * | 2019-08-19 | 2019-11-08 | 广东美的制冷设备有限公司 | Blower current-limiting circuit and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107994545B (en) | 2019-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11264794B2 (en) | Series compensator and control method | |
| US8570017B2 (en) | Voltage limiter and protection of a photovoltaic module | |
| US9640985B2 (en) | Circuit breaker | |
| KR101028786B1 (en) | Cabinet panel built-in zero-phase harmonic filter | |
| CN204333904U (en) | A kind of overvoltage crowbar | |
| CN204967236U (en) | Leakage protector | |
| CN103973134B (en) | Continuous-current plant and improve the pwm pulse control method of its power factor | |
| CN208272621U (en) | A kind of power protecting circuit | |
| CN107994545A (en) | The protection circuit and electric system of a kind of wind turbine | |
| CN209844635U (en) | Intelligent redundant power supply conversion device | |
| CN202616750U (en) | Control device for electronic motor protector | |
| CN209461383U (en) | Relay drive circuit, relay | |
| CN201937247U (en) | Abnormal high-voltage protection circuit | |
| CN206135392U (en) | Disconnected zero -sum in area lacks looks protect function's circuit breaker | |
| JP5330548B2 (en) | Overvoltage protection circuit for each switch power cycle | |
| CN216390492U (en) | Motor protection circuit | |
| CN204809859U (en) | Residual current operated protec tive device lacks zero protection circuit | |
| CN205092836U (en) | Power tube short circuit detects protection circuit, heating circuit and electrical equipment | |
| CN103746336A (en) | Superfast leakage switch and control method thereof | |
| CN204538652U (en) | A kind of low-voltage customer over-and under-voltage circuit breaker | |
| CN218041198U (en) | Intelligent power module and electric appliance | |
| CN218161788U (en) | Voltage abnormity protection circuit and electrical apparatus | |
| CN202978679U (en) | Hybrid integration IGBT driving circuit | |
| CN211127648U (en) | Motor and demagnetization-preventing shunt circuit thereof | |
| CN208174654U (en) | Pulsewidth limitation protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |