CN109725550A - Control method and device for converter brake circuit - Google Patents
Control method and device for converter brake circuit Download PDFInfo
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- CN109725550A CN109725550A CN201711041924.6A CN201711041924A CN109725550A CN 109725550 A CN109725550 A CN 109725550A CN 201711041924 A CN201711041924 A CN 201711041924A CN 109725550 A CN109725550 A CN 109725550A
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Abstract
The embodiment of the invention provides a control method and device for a brake circuit of a converter. The control method of the converter brake circuit comprises the following steps: acquiring a braking capacity recovery value of a braking circuit in a time period from the last braking to the current braking; calculating a real-time braking capacity value of the braking loop in the current braking process according to the braking capacity recovery value, the residual braking capacity value of the braking loop at the last braking end and the continuous braking duration of the braking loop after the current braking; and protecting the safe operation of the brake circuit according to the real-time brake capacity value. By adopting the technical scheme in the embodiment of the invention, the real-time braking capacity in the braking process of the braking loop can be obtained, and the safe operation of the braking loop can be protected according to the real-time braking capacity in the braking process of the braking loop.
Description
Technical field
The present invention relates to technical field of wind power generation more particularly to a kind of control methods and dress of current transformer brake circuit
It sets.
Background technique
Brake circuit is connected across between the positive negative busbar of wind driven generator set converter, for realizing wind power generating set
The important component of fast braking and load reliability operation.When the DC bus-bar voltage of current transformer quickly increases, brake circuit
Raised voltage can be converted to thermal energy consumption in time to fall, to guarantee protection DC bus-bar voltage without departing from trouble free service electricity
Pressure.
It in the prior art, is protection DC bus-bar voltage without departing from safe operating voltage, the control method of brake circuit is,
The control brake circuit starting when DC bus-bar voltage is higher than upper limit threshold voltage, when DC bus-bar voltage is lower than lower threshold electricity
Brake circuit is controlled when pressure to close.
But the inventors of the present application found that since the control method of brake circuit in the prior art is only related to system
The starting in dynamic circuit and the control of closing, the real-time stopping power being unable to get in brake circuit braking process, it may occur however that by
Caused by brake circuit overload operation the problem of brake circuit failure.
Summary of the invention
The embodiment of the invention provides the control methods and device of a kind of current transformer brake circuit, can obtain brake circuit
Real-time stopping power in braking process, and can be protected and be braked back according to the real-time stopping power in brake circuit braking process
The safe operation on road.
In a first aspect, the embodiment of the invention provides a kind of control method of current transformer brake circuit, current transformer braking
The control method in circuit includes:
Obtaining brake circuit terminates from last brake to the stopping power recovery value in current brake time started section；
According to the remaining Brake Energy force value at the end of stopping power recovery value and brake circuit last brake, obtain braking back
Initial brake ability value of the road when current brake starts；
According to initial brake ability value and brake circuit since current brake after continuous braking duration, calculating brake back
Real-time Brake Energy force value of road during current brake；
According to real-time Brake Energy force value, brake circuit safe operation is protected.
In some embodiments of first aspect, obtaining brake circuit terminates from last brake to the current brake time started
Stopping power recovery value in section, comprising:
According to the cooling curve of brake circuit, obtain brake circuit from after last brake to the current brake time started
Temperature drop-out value in section；
According to temperature drop-out value, stopping power recovery value is obtained.
In some embodiments of first aspect, according to temperature drop-out value, stopping power recovery value is obtained, comprising: according to
Following formula calculates stopping power recovery value:
ER=c × m × ▽ Td
Wherein, ERFor stopping power recovery value, ▽ TLFor temperature drop-out value, c is the specific heat of power resistor in brake circuit
Hold, m is the quality of power resistor in brake circuit.
In some embodiments of first aspect, at the end of stopping power recovery value and brake circuit last brake
Remaining Brake Energy force value obtains initial brake ability value of the brake circuit when current brake starts, comprising:
Calculate stopping power recovery value and remaining Brake Energy force value and value；
Using with value with the smaller value in the specified Brake Energy force value of brake circuit as initial brake ability value.
In some embodiments of first aspect, according to initial brake ability value and brake circuit since current brake after
Continuous braking duration, calculate real-time Brake Energy force value of brake circuit during current brake, comprising:
According to the following formula, real-time Brake Energy force value of brake circuit during current brake is calculated:
M=XS-Z(t1)
Wherein, M is real-time Brake Energy force value of brake circuit during current brake, XSIt is made for brake circuit currently
Initial brake ability value when dynamic beginning, Z (t1) it is that brake circuit brakes t to continuous since current brake1Braking after duration
Ability consumption value, t1For brake circuit since current brake after continuous braking duration.
In some embodiments of first aspect, the control method of current transformer brake circuit, further includes:
Confirm whether time interval of the brake circuit since last brake terminates to current brake is less than predetermined pulse week
Phase；
If brake circuit is less than the predetermined pulse period to the time interval that last brake terminates since current brake, control
For brake circuit processed after the last brake, the predetermined pulse period that is delayed sends starting control signal to brake circuit；
Signal, control brake circuit starting are controlled according to starting.
In some embodiments of first aspect, starting control signal is sent to brake circuit, comprising:
Calculate the maximum duty cycle of brake circuit；
According to maximum duty cycle modulating pulse width modulation (PWM) pulse enabling signal；
Modulated pwm pulse enabling signal is exported to brake circuit.
In some embodiments of first aspect, the maximum duty cycle of brake circuit is calculated, comprising:
According to the following formula, the maximum duty cycle of brake circuit is calculated:
D=(Udc-Udc_ref2)×K
Wherein, D is the maximum duty cycle of brake circuit, UdcFor the DC bus-bar voltage of current transformer, Udc_ref2For for controlling
The lower threshold voltage that brake circuit processed is closed, K are predetermined duty ratio coefficient.
In some embodiments of first aspect, the value of K meets following formula:
Wherein, Udc_ref1For the upper limit threshold voltage for controlling brake circuit starting, Udc_ref2To be made for controlling
The lower threshold voltage that dynamic circuit is closed.
In some embodiments of first aspect, according to real-time stopping power of brake circuit during current brake
Value, protection brake circuit safe operation, comprising:
Judge whether real-time Brake Energy force value of brake circuit during current brake is equal to 0；If brake circuit is being worked as
Real-time Brake Energy force value in preceding braking process is equal to 0, then generating indicates that brake circuit is in the first alarm signal of malfunction
Number, and the first alarm signal is sent to the controller of wind power generating set；
Or/also,
Real-time Brake Energy force value of brake circuit during current brake and wind power generating set are met and are safely operated
The braking requirement needed is compared；If real-time Brake Energy force value of brake circuit during current brake is less than wind-power electricity generation
Unit meets the braking requirement that safe operation needs, then generates the second alarm signal, and by the second alarm signal and brake circuit
Real-time Brake Energy force value during current brake is sent to the controller of wind power generating set.
Second aspect, the embodiment of the present invention provide a kind of control device of current transformer brake circuit, which brakes back
The control device on road, comprising:
Module is obtained, is terminated from last brake to the Brake Energy in current brake time started section for obtaining brake circuit
Power recovery value；
First computing module, for being braked according to the residue at the end of stopping power recovery value and brake circuit last brake
Ability value obtains initial brake ability value of the brake circuit when current brake starts；
Second computing module, for according to initial brake ability value and brake circuit since current brake after continuous system
Dynamic duration calculates real-time Brake Energy force value of brake circuit during current brake；
Execution module is protected, for protecting brake circuit safe operation according to real-time Brake Energy force value.
In some embodiments of second aspect, obtaining module includes:
Acquiring unit, for the cooling curve according to brake circuit, obtain brake circuit from after last brake to working as
Temperature drop-out value in preceding braking time started section；
First computing unit, for obtaining stopping power recovery value according to temperature drop-out value.
In some embodiments of second aspect, the first computing module includes:
Second computing unit, for calculate stopping power recovery value and remaining Brake Energy force value and value；
First comparing unit, for being made with value with the smaller value in the specified Brake Energy force value of brake circuit as initial
Kinetic energy force value.
In some embodiments of second aspect, the control device of current transformer brake circuit further include:
Confirmation module, for confirming whether time interval of the brake circuit since last brake terminates to current brake be small
In the predetermined pulse period；
Starting module, if being less than since current brake to the time interval that last brake terminates for brake circuit predetermined
Pulse period then controls brake circuit after the last brake, and the predetermined pulse period that is delayed opens to brake circuit transmission
Dynamic control signal；
Control module, for controlling signal, control brake circuit starting according to starting.
In some embodiments of second aspect, starting module is specifically used for, and calculates the maximum duty cycle of brake circuit；Root
According to maximum duty cycle modulating pulse width modulation (PWM) pulse enabling signal；And modulated pwm pulse is exported to brake circuit and is opened
Dynamic signal.
In some embodiments of second aspect, protection execution module includes:
Judging unit, for judging whether real-time Brake Energy force value of brake circuit during current brake is equal to 0；
First protection execution unit, if being equal to 0 for real-time Brake Energy force value of brake circuit during current brake,
Then generating indicates that brake circuit is in the first alarm signal of malfunction, and the first alarm signal is sent to wind-driven generator
The controller of group；
Or/also,
Second comparing unit, for the real-time Brake Energy force value and wind-power electricity generation by brake circuit during current brake
Unit meets the braking requirement that safe operation needs and is compared；
Second protection execution unit, if being less than wind for real-time Brake Energy force value of brake circuit during current brake
Power generator group meets the braking requirement that safe operation needs, then generates the second alarm signal, and by the second alarm signal and system
Dynamic real-time Brake Energy force value of circuit during current brake is sent to the controller of wind power generating set.
In some embodiments of second aspect, the controller of current transformer is arranged in the control device of current transformer brake circuit
In.
In embodiments of the present invention, terminated from last brake into current brake time started section by obtaining brake circuit
Stopping power recovery value, then according to the remaining stopping power at the end of stopping power recovery value, brake circuit last brake
Value and brake circuit since current brake after continuous braking duration, so that it may obtain brake circuit during current brake
Real-time Brake Energy force value.Then the real-time Brake Energy force value according to brake circuit during current brake, protection are braked back
Road safe operation, so that it may avoid the problem that the brake circuit failure due to caused by brake circuit overload operation occurs.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention,
In, the same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 is the flow diagram of the control method for the current transformer brake circuit that one embodiment of the invention provides；
Fig. 2 be another embodiment of the present invention provides current transformer brake circuit control method flow diagram；
Fig. 3 is the flow diagram of the control method for the current transformer brake circuit that further embodiment of this invention provides；
Fig. 4 is the flow diagram of the switch locking means of current transformer brake circuit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the control device of current transformer brake circuit provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram for the current transformer brake circuit that an example of the invention provides.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.
The embodiment of the invention provides the control methods and device of a kind of current transformer brake circuit, for protecting current transformer
The safe operation of brake circuit.
Fig. 1 is the flow diagram of the control method for the current transformer brake circuit that one embodiment of the invention provides.Such as Fig. 1 institute
Show, the control method of the current transformer brake circuit includes step 101 to step 104.
In a step 101, obtaining brake circuit terminates from last brake to the Brake Energy in current brake time started section
Power recovery value.
Wherein, brake circuit braking starts and the condition of end of braking can be determined according to the mode that stagnant ring compares.Example
Property, the upper limit threshold voltage and lower threshold voltage for DC bus-bar voltage can be set separately, then will acquire in real time
To the DC bus-bar voltage of brake circuit be compared with upper limit threshold voltage and lower threshold voltage, according to comparison result come
Judgement needs to control brake circuit and opens or control brake circuit closing.In the judgment process,
If the DC bus-bar voltage of real-time collected brake circuit is greater than upper limit threshold voltage, such as when 1090V, then
It can control brake circuit starting, so that brake circuit starts to brake.If the DC bus of real-time collected brake circuit
When voltage is greater than upper limit threshold voltage, such as 1075V, then it can control brake circuit closing, so that brake circuit terminates to brake.
In general, the too high voltages at DC bus end gradually can be converted to thermal energy consumption after braking starts by brake circuit
Fall, as brake circuit is gradually warmed up in braking process, the real-time Brake Energy force value of brake circuit is gradually decreased.Brake circuit
It needs gradually to spread out the heat of generation after end of braking, as brake circuit gradually cools down in recovery process, system
The Brake Energy force value in dynamic circuit is gradually recovered.
In a step 102, according to the remaining stopping power at the end of stopping power recovery value and brake circuit last brake
Value, obtains initial brake ability value of the brake circuit when current brake starts.
Wherein, the real-time stopping power at the end of the remaining Brake Energy force value at the end of last brake refers to last brake
Value.
In step 103, when continuous braking after according to initial brake ability value and brake circuit since current brake
It is long, calculate real-time Brake Energy force value of brake circuit during current brake.
Specifically, real-time stopping power of brake circuit during current brake can be calculated according to the following formula (1)
Value:
M=XS-Z(t1) (1)
Wherein, M is real-time Brake Energy force value of brake circuit during current brake, XSIt is made for brake circuit currently
Initial brake ability value when dynamic beginning, Z (t1) it is that brake circuit brakes t to continuous since current brake1Braking after duration
Ability consumption value, t1For brake circuit since current brake after continuous braking duration.
Wherein, brake circuit is since current brake to continuous braking t1Stopping power consumption value Z (t after duration1) can be with
It is obtained according to temperature rise-energy theorem.
In one example, temperature rise-energy theorem in brake circuit braking process are as follows:
Z(t1)=c × m × ▽ TS (2)
Wherein, Z (t1) it is that brake circuit brakes t to continuous since current brake1Stopping power consumption value after duration,
▽TSFor brake circuit to continuous braking t since current brake1Temperature rising value after duration, t1It is brake circuit from current
The continuous braking duration after starting is braked, c is the specific heat capacity of power resistor in brake circuit, and m is power resistor in brake circuit
Quality.
At step 104, according to real-time Brake Energy force value, brake circuit safe operation is protected.
It, can be by obtaining brake circuit from upper using the control method of the middle current transformer brake circuit of the embodiment of the present invention
Secondary end of braking is to the stopping power recovery value in current brake time started section, then according to stopping power recovery value, braking
Remaining Brake Energy force value and brake circuit at the end of the last brake of circuit since current brake after continuous braking duration, obtain
To real-time Brake Energy force value of brake circuit during current brake.Then through brake circuit the current brake during
Real-time Brake Energy force value, protection brake circuit safe operation, so that it may avoid occurring to draw due to brake circuit overload operation
The problem of brake circuit failure risen.
Fig. 2 be another embodiment of the present invention provides current transformer brake circuit control method flow diagram.Fig. 2 with
Fig. 1 the difference is that, the step 101 in Fig. 1 can be refined as the step 1011 in Fig. 2 to step 1012.
In step 1011, brake circuit can be obtained after the last brake according to the cooling curve of brake circuit
To the temperature drop-out value in current brake time started section.
Wherein, the cooling curve of brake circuit can be collected in real time by the temperature to brake circuit.By searching for system
The time point that the time point corresponding temperature T1 and current brake that last brake terminates in the cooling curve in dynamic circuit start is corresponding
Temperature T2, then T1 and T2 are made the difference, so that it may obtain brake circuit after last brake to current brake when
Between temperature drop-out value in section.
In step 1012, stopping power recovery value can be obtained according to temperature drop-out value.
Specifically, it can use temperature drop-energy theorem, temperature drop-out value is converted to brake circuit to be terminated from last brake
To the stopping power recovery value in current brake time started section.
In one example, temperature drop-energy theorem in brake circuit recovery process are as follows:
ER=c × m × ▽ Td (3)
Wherein, ERTerminate to the stopping power in current brake time started section to restore from last brake for brake circuit
Value, ▽ TLIt is brake circuit from, to the temperature drop-out value in current brake time started section, c is to brake back after last brake
The specific heat capacity of power resistor in road, m are the quality of power resistor in brake circuit.
Fig. 3 is the flow diagram of the control method for the current transformer brake circuit that further embodiment of this invention provides.Fig. 3 with
Fig. 1 the difference is that, the step 102 in Fig. 1 can be refined as the step 1021 in Fig. 3 to step 1022.
In step 1021, calculate stopping power recovery value and remaining Brake Energy force value and value.
In step 1022, made with value with the smaller value in the specified Brake Energy force value of the brake circuit as initial
Kinetic energy force value.
Wherein, if brake circuit from last brake terminate to the current brake time started section in stopping power recovery value and
The specified stopping power for being greater than or equal to brake circuit with value of remaining Brake Energy force value at the end of brake circuit last brake
Value, then illustrate brake circuit recovered completion, i.e. the temperature of brake circuit has been lowered to room temperature, at this time can be by brake circuit
Initial brake ability value of the specified Brake Energy force value as brake circuit when current brake starts.
If brake circuit from last brake terminate to the current brake time started section in stopping power recovery value and braking
The specified stopping power for being less than brake circuit with value of remaining Brake Energy force value at the end of the last brake of circuit, then illustrate to brake
Circuit is not restored also completely, if i.e. if desired brake circuit starts brake circuit also in higher temperature state at this time, can be incited somebody to action
Brake circuit terminates from last brake to the stopping power recovery value and brake circuit last time system in current brake time started section
Remaining Brake Energy force value at the end of dynamic and value, as initial brake ability value of the brake circuit when current brake starts.
Using the control method according to brake circuit in the prior art, when the DC bus of wind driven generator set converter
Voltage is lower, and in for judging between the brake circuit upper limit threshold voltage opened or closed and lower threshold voltage quickly
When fluctuation, the phenomenon that brake circuit is easy to happen frequent starting, for example, previous moment DC bus-bar voltage is lower than lower threshold electricity
Pressure, control brake circuit are closed, and subsequent time DC bus-bar voltage is higher than upper limit threshold voltage again, needs to control brake circuit weight
New to open, the frequent starting of this brake circuit is easy to cause the power module of current transformer sharply to generate heat, such as IGBT power
Module, to influence the safe operation of wind power generating set.
To avoid the problem that causing the power module of current transformer sharply to generate heat because of the frequent starting of brake circuit, the present invention
The brake circuit control method that embodiment proposes further includes the switching frequency locking means for brake circuit frequent starting.It please join
Fig. 4 is read, the switching frequency locking means of the brake circuit in Fig. 4 include step 401 and step 403.
In step 401, whether time interval of the confirmation brake circuit since last brake terminates to current brake be small
In the predetermined pulse period.
Wherein, the predetermined pulse period can be the pwm pulse for controlling brake circuit work.
In step 402, make a reservation for if brake circuit is less than since current brake to the time interval that last brake terminates
Pulse period then controls brake circuit after the last brake, and the predetermined pulse period that is delayed opens to brake circuit transmission
Dynamic control signal.
In step 403, signal, control brake circuit starting are controlled according to starting.
According to an embodiment of the invention, can be delayed a predetermined pulse week by brake circuit after the last brake
Phase starting, so that the time interval between adjacent braking twice is consistent with the pwm pulse in the course of work, to avoid due to system
Interval time between adjacent braking twice caused by dynamic circuit frequent starting is less than the pwm pulse in the course of work, and causes
The problem of power module of current transformer sharply generates heat, so that wind power generating set can be lower in DC bus-bar voltage, and
In for judging the operating condition of rapid fluctuations between the brake circuit upper limit threshold voltage opened or closed and lower threshold voltage
Lower safe operation.
Further, since duty ratio is bigger, the efficiency of brake circuit conversion thermal energy is higher, for the sound for improving brake circuit
Efficiency is answered, the maximum duty cycle of brake circuit can be calculated when brake circuit starts；According to maximum duty cycle modulation (PWM) arteries and veins
Rush enabling signal；Modulated pwm pulse enabling signal is exported to brake circuit.
Specifically, the maximum duty cycle of brake circuit can be calculated according to the following formula (4):
D=(Udc-Udc_ref2)×K (4)
Wherein, D is the maximum duty cycle of brake circuit, UdcFor the DC bus-bar voltage of current transformer, Udc_ref2For for controlling
The lower threshold voltage that brake circuit processed is closed, K are predetermined duty ratio coefficient.
Wherein, the value of K needs to meet following formula (5):
Wherein, Udc_ref1For the upper limit threshold voltage for controlling brake circuit starting, Udc_ref2To be made for controlling
The lower threshold voltage that dynamic circuit is closed.
According to an embodiment of the invention, can according to real-time Brake Energy force value of brake circuit during current brake,
From many aspects protection brake circuit safe operation.
First aspect, it can be determined that whether real-time Brake Energy force value of brake circuit during current brake is equal to 0, if
Real-time Brake Energy force value of brake circuit during current brake is equal to 0, then illustrates that brake circuit has been in malfunction,
Continuing braking can cause brake circuit that expendable failure occurs, and needing to generate at this time indicates that brake circuit is in malfunction
The first alarm signal, and the first alarm signal is sent to the controller of wind power generating set.By the control of wind power generating set
Device processed issues halt instruction, and control wind power generating set is shut down, and to overhaul to brake circuit, brake circuit is avoided to occur not
It can restore failure.
Second aspect, can be by real-time Brake Energy force value of brake circuit during current brake and wind power generating set
Meet the braking requirement that safe operation needs to be compared, if real-time Brake Energy force value of brake circuit during current brake
Meet the braking requirement that safe operation needs less than wind power generating set, then generate the second alarm signal, and by the second alarm signal
Number and real-time Brake Energy force value of brake circuit during current brake be sent to the controller of wind power generating set.
Wherein, the braking requirement for being safely operated needs may include that safe operation of the wind-driven generator under various working needs
The braking requirement wanted.Wind-driven generator various working may include high voltage crossing operating condition, low voltage crossing operating condition and
Rsafe shuts down operating condition etc..
By taking Rsafe is shut down as an example, if brake circuit repeatedly starts within a certain period of time, and the real-time system of brake circuit
When kinetic force is less than Rsafe shutdown demand, need the second alarm signal and brake circuit through communication protocol in current brake
Real-time Brake Energy force value in the process is transmitted to the controller of wind power generating set, is generated electricity by wind power generating set to current wind
The output power of unit carries out clipping, to be matched with the real-time stopping power of brake circuit.It avoids due to brake circuit
Safe operation demand under stopping power operating condition corresponding with wind power generating set mismatch caused by brake circuit failure or
Wind power generating set safety accident.
Fig. 5 is the structural schematic diagram of the control device of current transformer brake circuit provided in an embodiment of the present invention.Change in Fig. 5
The control device of stream device brake circuit includes obtaining module 501, the first computing module 502, the second computing module 503 and protection to hold
Row module 504.
Wherein, obtain module 501 terminates from last brake into current brake time started section for obtaining brake circuit
Stopping power recovery value.
Specifically, obtaining module 501 may include acquiring unit and the first computing unit.
To take brake circuit to terminate from last brake to the stopping power recovery value in current brake time started section, by obtaining
Unit is taken according to the cooling curve of brake circuit, obtain brake circuit from after last brake to the current brake time started section
Interior temperature drop-out value, then by the first computing unit according to temperature drop-out value, obtain brake circuit from last brake terminate to
Stopping power recovery value in current brake time started section.
First computing module 502 is used to be terminated from last brake into current brake time started section according to brake circuit
Remaining Brake Energy force value at the end of stopping power recovery value and brake circuit last brake, obtains brake circuit in current brake
Initial brake ability value when beginning.
Specifically, the first computing module 502 may include the second computing unit and the first comparing unit.
To obtain initial brake ability value of the brake circuit when current brake starts, can be calculated by the second computing unit
Brake circuit terminates from last brake to the stopping power recovery value and brake circuit last time system in current brake time started section
The sum of remaining Brake Energy force value at the end of dynamic, is terminated brake circuit to current brake from last brake by the first comparing unit
The sum of stopping power recovery value in time started section and the remaining Brake Energy force value at the end of brake circuit last brake and system
The specified Brake Energy force value in dynamic circuit compares.
In the first scenario, if brake circuit terminates from last brake to the Brake Energy in current brake time started section
The sum of remaining Brake Energy force value at the end of power recovery value and brake circuit last brake is greater than or equal to the specified of brake circuit
Brake Energy force value, the then initial brake using the specified Brake Energy force value of brake circuit as brake circuit when current brake starts
Ability value.
In the latter case, if brake circuit terminates from last brake to the Brake Energy in current brake time started section
The sum of remaining Brake Energy force value at the end of power recovery value and brake circuit last brake is less than the specified Brake Energy of brake circuit
Power then terminates brake circuit to the stopping power recovery value and brake circuit in current brake time started section from last brake
The sum of remaining Brake Energy force value at the end of last brake, as initial brake ability of the brake circuit when current brake starts
Value.
Second computing module 503 is used for initial brake ability value and braking according to brake circuit when current brake starts
Circuit since current brake after continuous braking duration, calculate real-time stopping power of brake circuit during current brake
Value.
Protect execution module 504 for the real-time Brake Energy force value according to brake circuit during current brake, protection
Brake circuit safe operation.Specifically, protection execution module 504 can be real-time during current brake according to brake circuit
Brake Energy force value protects the safety of brake circuit in terms of two
In a first aspect, protection execution module 504 may include that judging unit and first protect execution unit, it can be by judging
Whether real-time Brake Energy force value of unit judges brake circuit during current brake is equal to 0；By the first protection execution unit
If generating indicates at brake circuit in the case where real-time Brake Energy force value of brake circuit during current brake is equal to 0
In the first alarm signal of malfunction, and the first alarm signal is sent to the controller of wind power generating set.It is sent out by wind-force
The controller of motor group issues halt instruction, and control wind power generating set shuts down, to overhaul brake circuit, avoids braking
Unrecoverable failure occurs for circuit.
Second aspect, protection execution module 504 may include the second comparing unit and the second protection execution unit.It can be by
Real-time Brake Energy force value and wind power generating set satisfaction safety of second comparing unit by brake circuit during current brake
The braking requirement that operation needs is compared.By reality of second protection execution unit during if brake circuit is in current brake
When Brake Energy force value be less than wind power generating set meet safe operation need braking requirement in the case where, generate the second alarm signal
Number, and the real-time Brake Energy force value of the second alarm signal and brake circuit during current brake is sent to wind-driven generator
The controller of group.Clipping is carried out to the output power of wind power generating set by the controller of wind power generating set, is avoided due to system
Brake circuit caused by safe operation demand mismatch under the stopping power operating condition corresponding with wind power generating set in dynamic circuit
Failure or wind power generating set safety accident.
To avoid the problem that causing the power module of current transformer sharply to generate heat because of the frequent starting of brake circuit, the present invention
The control device for the current transformer brake circuit that embodiment provides further includes confirmation module, starting module and control module.
Wherein, confirmation module is for confirming that time interval of the brake circuit since last brake terminates to current brake is
It is no to be less than the predetermined pulse period.
If starting module is less than since current brake to the time interval that last brake terminates predetermined for brake circuit
Pulse period then controls brake circuit after the last brake, and the predetermined pulse period that is delayed opens to brake circuit transmission
Dynamic control signal；
Control module is used to control signal, control brake circuit starting according to starting.
It further, is the response efficiency for improving brake circuit, starting module is specifically used for calculating the maximum of brake circuit
Duty ratio, according to maximum duty cycle modulating pulse width modulation (PWM) pulse enabling signal；And it is exported to brake circuit modulated
Pwm pulse enabling signal.
The embodiment of the present invention also provides a kind of current transformer of wind power generating set, and the current transformer of the wind power generating set includes
The control device of brake circuit and current transformer brake circuit as described above.
Fig. 6 is the structural schematic diagram for the current transformer brake circuit that an example of the invention provides.Brake circuit packet in Fig. 6
Include: metal-oxide-semiconductor M1, power resistor R, the first buffering diode D1, the second buffering diode D2 and first node A, second node B and
Third node C.
Wherein, the positive busbar of first node A and current transformer connects, and the cathode bus bar of second node B and current transformer connects；
The control terminal of metal-oxide-semiconductor M1 is connect with brake circuit control device；The first end of metal-oxide-semiconductor M1 is connect with second node B, metal-oxide-semiconductor M1
Second end connect with third node C；
The input terminal of first buffering diode D1 is connect with second node B, the output end of the first buffering diode D1 and
Three node C connections；
The input terminal of second buffering diode D2 is connect with third node C, the output end of the second buffering diode D2 and
One node A connection；
The first end of power resistor R is connect with first node A, and the second end of power resistor R is connect with third node C.
According to an embodiment of the invention, the current transformer brake circuit with above structure is at work, the control of metal-oxide-semiconductor M1
End receives the PWM working signal that brake circuit control device is sent, so that the first end and second end of metal-oxide-semiconductor M1 is connected, power
Resistance is also switched on.Since power resistor is connected across between the positive busbar of current transformer and cathode bus bar, after power resistor conducting, just
Too high voltages on the DC bus being located between positive busbar and cathode bus bar thermal energy consumption can be converted to fall.Work as needs
When closing current transformer brake circuit, brake circuit control device stops the PWM working signal sent to the control terminal of metal-oxide-semiconductor M1,
So that the first end and second end of metal-oxide-semiconductor M1 disconnects, so that power resistor also disconnects, power resistor stops working.
It should be noted that the control method and device of current transformer brake circuit provided in an embodiment of the present invention are applicable to
Brake circuit with other structures, those skilled in the art can use change provided in an embodiment of the present invention according to actual needs
The control method and device for flowing device brake circuit control selected brake circuit, herein without limiting.
It should be clear that all the embodiments in this specification are described in a progressive manner, each embodiment it
Between the same or similar part may refer to each other, the highlights of each of the examples are it is different from other embodiments it
Place.For device embodiment, related place may refer to the declaratives of embodiment of the method.Not office of the embodiment of the present invention
It is limited to particular step and structure described above and shown in figure.Those skilled in the art can understand the present invention in fact
It after the spirit for applying example, is variously modified, modification and addition, or the sequence between changing the step.Also, it is risen in order to concise
See, omits the detailed description to known method technology here.
Functional block shown in above structural block diagram can be implemented as hardware, software, firmware or their combination.When
When realizing in hardware, electronic circuit, specific integrated circuit (ASIC), firmware appropriate, plug-in unit, function may, for example, be
Card etc..When being realized with software mode, the element of the embodiment of the present invention is used to execute program or the generation of required task
Code section.Perhaps code segment can store in machine readable media program or the data-signal by carrying in carrier wave is passing
Defeated medium or communication links are sent." machine readable media " may include any medium for capableing of storage or transmission information.
The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), soft
Disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, inline
The computer network of net etc. is downloaded.
The embodiment of the present invention can be realized in other specific forms, without departing from its spirit and essential characteristics.For example, special
Determining algorithm described in embodiment can be modified, and system architecture is without departing from the substantially smart of the embodiment of the present invention
Mind.Therefore, current embodiment is all counted as being exemplary rather than limited, the model of the embodiment of the present invention in all respects
It encloses by appended claims rather than foregoing description defines, also, falls into the meaning of claim and complete in the range of equivalent
Portion changes all to be included among the range of the embodiment of the present invention.
Claims (17)
1. a kind of control method of current transformer brake circuit characterized by comprising
Obtaining brake circuit terminates from last brake to the stopping power recovery value in current brake time started section；
According to the remaining Brake Energy force value at the end of the stopping power recovery value and the brake circuit last brake, institute is obtained
State initial brake ability value of the brake circuit when current brake starts；
According to the initial brake ability value and the brake circuit since current brake after continuous braking duration, calculate institute
State real-time Brake Energy force value of brake circuit during current brake；
According to the real-time Brake Energy force value, the brake circuit is protected to be safely operated.
2. control method according to claim 1, which is characterized in that the acquisition brake circuit from last brake terminate to
Stopping power recovery value in current brake time started section, comprising:
According to the cooling curve of the brake circuit, obtain the brake circuit since after last brake to current brake
Temperature drop-out value in period；
According to the temperature drop-out value, the stopping power recovery value is obtained.
3. control method according to claim 2, which is characterized in that it is described according to the temperature drop-out value, it obtains described
Stopping power recovery value, comprising:
According to the following formula, the stopping power recovery value is calculated:
ER=c × m × ▽ Td
Wherein, ERFor the stopping power recovery value, ▽ TLFor the temperature drop-out value, c is the ratio of power resistor in brake circuit
Thermal capacitance, m are the quality of power resistor in brake circuit.
4. control method according to claim 1, which is characterized in that described according to the stopping power recovery value and described
Remaining Brake Energy force value at the end of brake circuit last brake, it is initial when current brake starts to obtain the brake circuit
Brake Energy force value, comprising:
Calculate the stopping power recovery value and the remaining Brake Energy force value and value；
Using described and value with the smaller value in the specified Brake Energy force value of the brake circuit as the initial brake ability value.
5. control method according to claim 1, which is characterized in that described according to the initial brake ability value and described
Brake circuit since current brake after continuous braking duration, it is real-time during current brake to calculate the brake circuit
Brake Energy force value, comprising:
According to the following formula, real-time Brake Energy force value of brake circuit during current brake is calculated:
M=XS-Z(t1)
Wherein, M is real-time Brake Energy force value of brake circuit during current brake, XSWorking as the brake circuit
Initial brake ability value when preceding braking starts, Z (t1) it is that the brake circuit brakes t to continuous since current brake1Duration
Stopping power consumption value afterwards, t1For the brake circuit since current brake after continuous braking duration.
6. control method according to claim 1, which is characterized in that the control method further include:
Confirm whether time interval of the brake circuit since last brake terminates to current brake is less than predetermined pulse week
Phase；
If the brake circuit is less than the predetermined pulse period to the time interval that last brake terminates since current brake, control
The brake circuit is made after the last brake, the predetermined pulse period that is delayed sends starting control to the brake circuit
Signal；
Signal is controlled according to the starting, controls the brake circuit starting.
7. control method according to claim 6, which is characterized in that described to send starting control letter to the brake circuit
Number, comprising:
Calculate the maximum duty cycle of the brake circuit；
According to the maximum duty cycle modulating pulse width modulation (PWM) pulse enabling signal；
Modulated pwm pulse enabling signal is exported to the brake circuit.
8. control method according to claim 7, which is characterized in that the maximum duty for calculating the brake circuit
Than, comprising:
According to the following formula, the maximum duty cycle of the brake circuit is calculated:
D=(Udc-Udc_ref2)×K
Wherein, D is the maximum duty cycle of the brake circuit, UdcFor the DC bus-bar voltage of the current transformer, Udc_ref2For with
In the lower threshold voltage for controlling the brake circuit closing, K is predetermined duty ratio coefficient.
9. control method according to claim 7, which is characterized in that the value of K meets following formula:
Wherein, Udc_ref1For the upper limit threshold voltage for controlling brake circuit starting,
Udc_ref2For the lower threshold voltage closed for controlling the brake circuit.
10. control method according to claim 1, which is characterized in that it is described according to the brake circuit in current brake
Real-time Brake Energy force value in the process protects the brake circuit to be safely operated, comprising:
Judge whether real-time Brake Energy force value of brake circuit during current brake is equal to 0；If the brake circuit
Real-time Brake Energy force value during current brake is equal to 0, then generating indicates that the brake circuit is in the of malfunction
One alarm signal, and first alarm signal is sent to the controller of wind power generating set；Or/also,
Real-time Brake Energy force value of brake circuit during current brake and wind power generating set are met and are safely operated
The braking requirement needed is compared；If real-time Brake Energy force value of brake circuit during current brake is less than described
Wind power generating set meets the braking requirement that safe operation needs, then generates the second alarm signal, and by second alarm signal
Number and real-time Brake Energy force value of brake circuit during current brake be sent to the control of the wind power generating set
Device.
11. a kind of control device of current transformer brake circuit characterized by comprising
Obtain module, for obtain brake circuit from last brake terminate to the current brake time started section in stopping power it is extensive
Complex value；
First computing module, for according to the residue at the end of the stopping power recovery value and the brake circuit last brake
Brake Energy force value obtains initial brake ability value of the brake circuit when current brake starts；
Second computing module, for according to the initial brake ability value and the brake circuit since current brake after company
Continuous braking duration, calculates real-time Brake Energy force value of brake circuit during current brake；
Execution module is protected, for protecting the brake circuit to be safely operated according to real-time Brake Energy force value.
12. control device according to claim 11, which is characterized in that the acquisition module includes:
Acquiring unit obtains the brake circuit after the last brake for the cooling curve according to the brake circuit
To the temperature drop-out value in current brake time started section；
First computing unit, for obtaining stopping power recovery value according to the temperature drop-out value.
13. control device according to claim 11, which is characterized in that first computing module includes:
Second computing unit, for calculate the stopping power recovery value and the remaining Brake Energy force value and value；
First comparing unit, for using the smaller value in described and value and the specified Brake Energy force value of the brake circuit as institute
State initial brake ability value.
14. control device according to claim 11, which is characterized in that the control device further include:
Confirmation module, for confirming whether time interval of the brake circuit since last brake terminates to current brake be small
In the predetermined pulse period；
Starting module, if being less than since current brake to the time interval that last brake terminates for the brake circuit predetermined
Pulse period then controls the brake circuit after the last brake, and the predetermined pulse period that is delayed brakes back to described
Road sends starting control signal；
Control module controls the brake circuit starting for controlling signal according to the starting.
15. control device according to claim 14, which is characterized in that the starting module is specifically used for, described in calculating
The maximum duty cycle of brake circuit；According to the maximum duty cycle modulating pulse width modulation (PWM) pulse enabling signal；And to institute
It states brake circuit and exports modulated pwm pulse enabling signal.
16. control device according to claim 11, which is characterized in that the protection execution module includes:
Judging unit, for judging whether real-time Brake Energy force value of brake circuit during current brake is equal to 0；
First protection execution unit, if being equal to 0 for real-time Brake Energy force value of brake circuit during current brake,
Then generating indicates that the brake circuit is in the first alarm signal of malfunction, and first alarm signal is sent to wind
The controller of power generator group.
Or/also,
Second comparing unit, for the real-time Brake Energy force value and wind-power electricity generation by the brake circuit during current brake
Unit meets the braking requirement that safe operation needs and is compared；
Second protection execution unit, if being less than institute for real-time Brake Energy force value of brake circuit during current brake
It states wind power generating set and meets the braking requirement that safe operation needs, then generate the second alarm signal, and described second is alarmed
The real-time Brake Energy force value of signal and brake circuit during current brake is sent to the control of the wind power generating set
Device processed.
17. control device described in any one of 1-16 according to claim 1, which is characterized in that the control device setting exists
In the controller of current transformer.
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| CN201711041924.6A CN109725550B (en) | 2017-10-30 | 2017-10-30 | Control method and device for converter brake circuit |
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| CN201711041924.6A CN109725550B (en) | 2017-10-30 | 2017-10-30 | Control method and device for converter brake circuit |
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Cited By (1)
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| CN113381438A (en) * | 2020-03-10 | 2021-09-10 | 北京金风科创风电设备有限公司 | Power reduction control method and device for wind turbine generator |
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