CN104579101A - Control system and control method for switching variable frequency into power frequency by high-voltage frequency converter - Google Patents
Control system and control method for switching variable frequency into power frequency by high-voltage frequency converter Download PDFInfo
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- CN104579101A CN104579101A CN201410723356.8A CN201410723356A CN104579101A CN 104579101 A CN104579101 A CN 104579101A CN 201410723356 A CN201410723356 A CN 201410723356A CN 104579101 A CN104579101 A CN 104579101A
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- 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
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- 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
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Abstract
The invention discloses a control system and a control method for switching variable frequency into power frequency by a high-voltage frequency converter. The method comprises the following steps: acquiring phase sequences, phases and frequency of a power frequency signal and a variable frequency signal; when the phase sequences of the variable frequency signal and the power frequency signal are consistent and the frequency and/or the phases of the variable frequency signal and the power frequency signal are not synchronous, enabling the high-voltage frequency converter to regulate the frequency of the variable frequency signal, and when the frequency and the phases of the acquired variable frequency signal and power frequency signal are synchronous, determining a compensating phase according to a frequency attenuation amplitude value of a motor in the transient state process of power failure and action time of switching-off of a second contactor and switching-on of a third contactor, enabling the high-voltage frequency converter to carry out phase compensation on the output variable frequency signal by the compensating phase, controlling the high-voltage frequency converter to execute the switching action after completing phase compensation and sequentially controlling the second contactor to be switched off and controlling a third contactor to be switched on in the action time. According to the control system and the control method, in the power frequency switching process, an impact current cannot be generated and the motor cannot be damaged, thus, an electric reactor also does not need to be added.
Description
Technical field
The present invention relates to Motor Control Field, particularly relate to control system and control method that a kind of high voltage converter frequency conversion switches to power frequency.
Background technology
High voltage converter is widely used in the applications such as iron and steel, petrochemical industry, mining industry, metallurgy and urban construction, in reduction energy consumption, improves in technique etc. and plays an important role, and particularly concerning high pressure positive blower, pump-type load, energy-saving effect is remarkable.For the work of multiple stage high-voltage electromotor parallel and without the need to the application scenario of all simultaneously speed governing, separate unit high voltage converter can be utilized, control the order soft start of multiple electric motors, and a wherein high-voltage motor is carried out to speed governing controls air quantity to reach, flow reaches energy-conservation object.
High-voltage high-power motor rotator inertia is large, and rotor time constant is large, and therefore, after high-voltage high-power motor is shut down, the residual voltage of motor has just been decayed for a long time, generally reaches tens seconds, even the time of a few minutes.Long-time shutdown is unfavorable for continuous seepage.Usually, high voltage converter realize soft of multiple stage high-voltage motor switch to common frequency power network run way have following several:
1) manual switchover mode:
As shown in Figure 1, the input of high voltage converter 1 ' is connected to high voltage bus via switch QS1 ', output is connected to motor via switch QS2 ', motor is connected to high voltage bus via switch QS3 ', during work, and first Closing Switch QS1 ', QS2 ', cut-off switch QS3 ', utilize high voltage converter 1 ' that drive motor is moved to power frequency, then manual cut-off switch QS2 ', Closing Switch QS3 '.
Manual switchover mode small investment, has obvious power-off time when examination and repair for high-pressure frequency converter 1 ', can guarantee personal safety, but complicated operation, switching time is long, and needs to produce the laggard row manual operation of time-out, does not meet the stability requirement of producing and running continuously.And, because switching has impulse current instantaneously, between motor and high voltage bus, also must be in series with reactor L.
2) automatic switching mode:
With reference to figure 2, automatic switching mode increases contactor KM1 ', KM2 ' KM3 ' on the basis shown in Fig. 1.When starting; contactor KM1 ', KM2 ' are closed; contactor KM3 ' disconnects; high voltage converter 1 ' first powers on, and drive motor moves to power frequency, and then control contactor KM2 ' disconnects; high voltage converter 1 ' is shut down; wait for a period of time and treat that motor side voltage attenuation is to 0, then control contactor KM3 ' closes, switching power frequency operation.This mode carrys out the operation of hand control switch QS2 ' in alternate figures 1, QS3 ' via the switching of control contactor KM2 ', KM3 ', realize the automatic switchover of conversion system to power frequency mode.
Which is before contactor KM3 ' is closed, and needing waits for a period of time avoids motor transient process, waits for that the setting of closing time is for some scenes, can not arrange long.In addition, because motor speed is unknown, closed power frequency contactor KM3 moment, have impulse current, switching even causes higher level's switch trip to power frequency operation moment, needs equally to install reactor L additional.
In addition, above two kinds of modes all can occur that the moment of switching power frequency occurs therefore needing the defect of impulse current to install reactor L additional, add cost and the volume of system, and therefore, prior art existing defects, needs to improve.
Summary of the invention
The technical problem to be solved in the present invention is, impulse current appears in the moment for the above-mentioned switching power frequency of prior art, install reactor additional adds the cost of system and the defect of volume, provides a kind of high voltage converter frequency conversion to switch to control system and the control method of power frequency.
The technical solution adopted for the present invention to solve the technical problems is: construct the control method that a kind of high voltage converter frequency conversion switches to power frequency, for the input of motor is switched to power frequency mode from conversion system, described motor is connected to high voltage bus via the 3rd contactor, described motor is connected with high voltage converter via the second contactor, described high voltage converter is connected with high voltage bus via the first contactor, said method comprising the steps of:
Phase sequence, phase place, the frequency of a frequency variation signal that (), the phase sequence gathering the power frequency component of high voltage bus side, phase place, frequency and high voltage converter export;
(b), when frequency variation signal is consistent with the phase sequence of power frequency component, judge that whether frequency variation signal is synchronous with the frequency of power frequency component and whether phase place is synchronous, and the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, according to phase place, the frequency of frequency variation signal and power frequency component, make described high voltage converter regulate the frequency of frequency variation signal, and in the Frequency Synchronization of the described frequency variation signal collected and power frequency component and Phase synchronization time perform step (c);
(c), determine compensation of phase according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor disconnects and the 3rd contactor is closed operate time, make described high voltage converter carry out phase compensation with described compensation of phase to the frequency variation signal exported, and perform step (d) after phase compensation completes;
D (), control high voltage converter perform switching action, successively control the second contactor disconnection, the 3rd contactor is closed within described operate time.
High voltage converter frequency conversion of the present invention switches to the control method of power frequency, and wherein, the compensation of phase in described step (c) is determined according to following formula:
Δθ＝2π*Δf*T
Wherein, Δ θ represents compensation of phase, and Δ f represents the frequency decay amplitude of motor in the transient process of power down, and T represents described operate time.
High voltage converter frequency conversion of the present invention switches to the control method of power frequency, wherein, the described high voltage converter that makes in described step (c) carries out phase compensation with described compensation of phase comprise the frequency variation signal exported: compare with the phase place of power frequency component after the phase place of the frequency variation signal of Real-time Collection is deducted described compensation of phase
And the phase place of the phase place of frequency variation signal deduct described compensation of phase after delayed power frequency component not synchronous with the phase place of power frequency component after if the phase place of frequency variation signal deducts described compensation of phase, then send positive frequency instruction to high voltage converter, described high voltage converter receives positive frequency instruction and increases the frequency of frequency variation signal;
The phase place of and the phase place of frequency variation signal not synchronous with the phase place of power frequency component advanced power frequency component after deducting described compensation of phase after if the phase place of frequency variation signal deducts described compensation of phase, then send negative frequency instruction to high voltage converter, described high voltage converter receives negative frequency instruction and reduces the frequency of frequency variation signal;
If the phase place of frequency variation signal deducts the Phase synchronization with power frequency component after described compensation of phase, then determine that phase compensation completes, send switching command to high voltage converter.
High voltage converter frequency conversion of the present invention switches to the control method of power frequency, and wherein, controlling the process that the second contactor disconnects, the 3rd contactor is closed in described step (d) is:
High voltage converter receives described switching command, sends breaking signal to the second contactor;
Perform breaking operation when second contactor receives breaking signal and feed back when disconnecting completely breaking signal to high voltage converter;
High voltage converter sends switching signal to the 3rd contactor when receiving the breaking signal of the second contactor feedback;
Perform closing operation when 3rd contactor receives switching signal and feed back when completely closed switching signal to high voltage converter;
High voltage converter receives the switching signal of the 3rd contactor feedback and determines that the input of described motor switches to power frequency mode.
High voltage converter frequency conversion of the present invention switches to the control method of power frequency, wherein, time corresponding to process that breaking signal to high voltage converter receives the switching signal of the 3rd contactor feedback is sent to the second contactor for: high voltage converter described operate time.
High voltage converter frequency conversion of the present invention switches to the control method of power frequency, and wherein, the standard of the Frequency Synchronization of described frequency variation signal and power frequency component is: the difference of the frequency of described frequency variation signal and power frequency component is within the scope of first threshold;
The phase locked standard of described frequency variation signal and power frequency component is: the difference of the phase place of described frequency variation signal and power frequency component is within the scope of Second Threshold.
High voltage converter frequency conversion of the present invention switches to the control method of power frequency, wherein, the described high voltage converter that makes in described step (b) regulates the frequency of frequency variation signal to comprise: by the phase place of the frequency variation signal of Real-time Collection and power frequency component, frequency is corresponding respectively compares
If frequency and/or the phase place of frequency variation signal and power frequency component are asynchronous, and the phase place of the delayed phase power frequency component of frequency variation signal, then send the first synchronic command to high voltage converter, described high voltage converter receives the first synchronic command and increases the frequency of frequency variation signal;
If frequency and/or the phase place of frequency variation signal and power frequency component are asynchronous, and the phase place of the advanced power frequency component of the phase place of frequency variation signal, then send the second synchronic command to high voltage converter, described high voltage converter receives the second synchronic command and reduces the frequency of frequency variation signal.
The invention also discloses the control system that a kind of high voltage converter frequency conversion switches to power frequency, for the input of motor is switched to power frequency mode from conversion system, this system comprises: high voltage converter, the first contactor, the second contactor, the 3rd contactor, described motor is connected to high voltage bus via the 3rd contactor, described motor is connected with high voltage converter via the second contactor, described high voltage converter is connected with high voltage bus via the first contactor
This system also comprises acquisition module, synchronization module, phase compensation block:
Acquisition module, for gathering phase sequence, phase place, the frequency of the frequency variation signal that the phase sequence of the power frequency component of high voltage bus side, phase place, frequency and high voltage converter export;
Synchronization module, for when frequency variation signal is consistent with the phase sequence of power frequency component, judge that whether frequency variation signal is synchronous with the frequency of power frequency component and whether phase place is synchronous, and the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, according to phase place, the frequency of frequency variation signal and power frequency component, sending synchronic command to described high voltage converter makes described high voltage converter regulate the frequency of frequency variation signal, and in the Frequency Synchronization of described frequency variation signal and power frequency component and Phase synchronization time send synchronic command to phase compensation block;
Phase compensation block, for synchronic command described in receiving, compensation of phase is determined according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor disconnects and the 3rd contactor is closed operate time, and send compensating instruction to described high voltage converter, and when phase compensation completes, send switching command to high voltage converter;
High voltage converter, for the frequency that receives the frequency variation signal of described synchronic command regulation output to make the Frequency Synchronization of described frequency variation signal and power frequency component and Phase synchronization, and receive described compensating instruction and with described compensation of phase, phase compensation carried out to the frequency variation signal exported, and receive described switching command and perform switching action, within described operate time, successively control the second contactor disconnection, the 3rd contactor is closed.
High voltage converter frequency conversion of the present invention switches to the control system of power frequency, and wherein, described compensating instruction comprises: positive frequency instruction and negative frequency instruction; Described phase compensation block comprises compensation of phase and calculates unit and phase comparison unit;
Compensation of phase calculates unit, for determining compensation of phase according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor disconnects and the 3rd contactor is closed operate time, described compensation of phase is determined according to following formula: Δ θ=2 π * Δ f*T, wherein, Δ θ represents compensation of phase, Δ f represents the frequency decay amplitude of motor in the transient process of power down, and T represents described operate time;
Phase comparison unit, for synchronic command described in receiving, compare with the phase place of power frequency component after the phase place of the frequency variation signal of Real-time Collection is deducted described compensation of phase, and the phase place of the phase place of frequency variation signal deduct described compensation of phase after delayed power frequency component not synchronous with the phase place of power frequency component after if the phase place of frequency variation signal deducts described compensation of phase, then send positive frequency instruction to high voltage converter; If the phase place of and the phase place of frequency variation signal not synchronous with the phase place of power frequency component advanced power frequency component after deducting described compensation of phase after the phase place of frequency variation signal deducts described compensation of phase, then send negative frequency instruction to high voltage converter; If the phase place of frequency variation signal deducts the Phase synchronization with power frequency component after described compensation of phase, then determine that phase compensation completes, stop the comparison of phase place, send switching command to high voltage converter.
High voltage converter frequency conversion of the present invention switches to the control system of power frequency, and wherein, described high voltage converter comprises: synchronization frequency modulation unit, compensation frequency modulation unit, switch control unit;
Synchronization frequency modulation unit, for receiving described synchronic command, the frequency of the frequency variation signal of regulation output is to make the Frequency Synchronization of described frequency variation signal and power frequency component and Phase synchronization;
Compensate frequency modulation unit, for receiving described positive frequency instruction and increasing the frequency of frequency variation signal, and receive described negative frequency instruction and reduce the frequency of frequency variation signal;
Switch control unit, for receiving switching command and sending breaking signal to the second contactor, and receive the breaking signal of the second contactor feedback and send switching signal to the 3rd contactor, and receive the switching signal of the 3rd contactor transmission and determine that the input of described motor switches to power frequency mode
Described operate time for: switch control unit to the second contactor send breaking signal to receive the 3rd contactor feedback switching signal process corresponding to time.
Implement control system and control method that high voltage converter frequency conversion of the present invention switches to power frequency, there is following beneficial effect: the present invention is before switching to power frequency, controlling high voltage converter regulates the frequency of frequency variation signal until the Frequency Synchronization of frequency variation signal and power frequency component and Phase synchronization, so, when switching to power frequency, for motor, the change of its motor side back electromotive force is less, not easily there is impulse current, and consider that the second contactor disconnects, 3rd contactor closes to be needed to expend certain operate time, within this operate time, motor is in transient process, its motor side back electromotive force there will be decay, therefore, the present invention is before the second contactor that Electric Machine Control frequency variation signal inputs disconnects, phase compensation is carried out to the frequency variation signal exported in Frequency Synchronization and on phase locked basis, to ensure that motor side back electromotive force still can be synchronous with the power frequency component of input after the decay within operate time, finally reach motor and put into real Phase synchronization common frequency power network time of running, the present invention can not produce impulse current when switching power frequency, motor can not be damaged, also therefore without the need to increasing reactor.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 be in prior art manual switchover to the structural representation of the control system of power frequency;
Fig. 2 is the structural representation of the control system automatically switching to power frequency in prior art;
Fig. 3 is the structured flowchart that high voltage converter frequency conversion of the present invention switches to the preferred embodiment of the control system of power frequency;
Fig. 4 is the flow chart that high voltage converter frequency conversion of the present invention switches to the control method of power frequency;
Fig. 5 is the flow chart of phase compensation step in Fig. 4.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
With reference to figure 3, it is the structured flowchart that high voltage converter frequency conversion of the present invention switches to the preferred embodiment of the control system of power frequency;
High voltage converter frequency conversion of the present invention switches to the control system of power frequency, for the input of motor is switched to power frequency mode from conversion system, comprise: master switch QF, high voltage converter 1, switch QS1, the first contactor KM1, the second contactor KM2, switch QS2, the 3rd contactor KM3, described high voltage converter 1 is connected with high voltage bus via described first contactor KM1, switch QS1, described high voltage converter 1 is also connected with motor via described second contactor KM2, switch QS2, and described motor is connected to described high voltage bus via described 3rd contactor KM3.
High voltage converter 1 can control the second contactor KM2, the 3rd contactor KM3 automatically switches, and in order to avoid switching impulse current during power frequency, invention increases following functions module: acquisition module 21, synchronization module 22, phase compensation block 23.
Acquisition module 21: comprise the Phase sequence detection unit 211 gathering frequency variation signal and power frequency component phase sequence, the phase detection unit 212 gathering frequency variation signal and power frequency component phase place, gather the amplitude detection unit 213 of the voltage of frequency variation signal and power frequency component, gather the frequency detecting unit 214 of frequency variation signal and power frequency component frequency.
Reach level and smooth shock-free synchronism switching, frequency variation signal demand fulfillment 3 conditions that the power frequency component that high voltage bus inputs exports with high voltage converter 1: phase sequence is consistent, Phase synchronization, Frequency Synchronization, preferably can also using voltage magnitude also as a restrictive condition, Phase synchronization, Frequency Synchronization, amplitude are all synchronously by regulating the frequency of frequency variation signal to realize.
The calculating of the phase sequence of the frequency variation signal exported about the phase sequence of power frequency component of high voltage bus input, phase place, frequency and high voltage converter 1, phase place, frequency, prior art has multiple acquisition methods, one method is by sampling three-phase input voltage signal and high voltage converter three-phase output voltage signal, obtains phase sequence, phase place and frequency by mathematical algorithms; Another kind method observes phase sequence, phase place and frequency by observer, and observer has phase-locked loop pll observer etc. usually.
Synchronization module 22: when frequency variation signal is consistent with the phase sequence of power frequency component, judge that whether frequency variation signal is synchronous with the frequency of power frequency component and whether phase place is synchronous, and the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, according to phase place, the frequency of frequency variation signal and power frequency component, sending synchronic command makes described high voltage converter 1 regulate the frequency of frequency variation signal to described high voltage converter 1, and in the Frequency Synchronization of frequency variation signal and power frequency component and Phase synchronization time send synchronic command to phase compensation block 23.Wherein, synchronic command comprises the second synchronic command representing and need the first synchronic command of increase frequency and expression to need to reduce frequency.Send the first synchronic command when the phase place of the delayed phase power frequency component of frequency variation signal, send the second synchronic command when the phase place of the advanced power frequency component of phase place of frequency variation signal.
Phase compensation block 23: comprise compensation of phase and calculate unit 231 and phase comparison unit 232;
Compensation of phase calculates unit 231, for determining compensation of phase according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor KM2 disconnects and the 3rd contactor KM3 is closed operate time;
Phase comparison unit 232, for synchronic command described in receiving, repeatedly compare the frequency variation signal of Real-time Collection and the phase place of power frequency component, and the phase place of the phase place of frequency variation signal deduct described compensation of phase after delayed power frequency component not synchronous with the phase place of power frequency component after if the phase place of frequency variation signal deducts described compensation of phase, then send positive frequency instruction to high voltage converter 1, the phase place of and the phase place of frequency variation signal not synchronous with the phase place of power frequency component advanced power frequency component after deducting described compensation of phase after if the phase place of frequency variation signal deducts described compensation of phase, then send negative frequency instruction to high voltage converter 1, if the phase place of frequency variation signal deducts the Phase synchronization with power frequency component after described compensation of phase, then determine that phase compensation completes, stop the comparison of phase place, send switching command to high voltage converter 1,
High voltage converter 1: comprise synchronization frequency modulation unit, compensate frequency modulation unit, switch control unit;
Synchronization frequency modulation unit, for receiving described first synchronic command and the frequency of frequency variation signal being increased a first frequency Δ θ 1, and receives described second synchronic command and the frequency of frequency variation signal is reduced a first frequency Δ θ 1;
Compensate frequency modulation unit, for receiving described positive frequency instruction and the frequency of frequency variation signal being increased a second frequency Δ θ 2, and receive described negative frequency instruction and the frequency of frequency variation signal reduced a second frequency Δ θ 2;
Switch control unit, for receiving switching command and sending breaking signal to the second contactor KM2, and receive the breaking signal of the second contactor KM2 feedback and send switching signal to the 3rd contactor KM3, and receive the switching signal of the 3rd contactor KM3 transmission and determine that the input of described motor switches to power frequency mode.
Composition graphs 3, with reference to figure 4-5, elaborates control system of the present invention and square ratio juris.With reference to figure 4, control method of the present invention, mainly comprises the following steps:
Phase sequence, phase place, the frequency of the frequency variation signal that S1, the phase sequence gathering the power frequency component of high voltage bus side, phase place, frequency and high voltage converter 1 export;
S2, judge that whether frequency variation signal is consistent with the phase sequence of power frequency component, if frequency variation signal is consistent with the phase sequence of power frequency component, then enter step S3; If the phase sequence of frequency variation signal and power frequency component is inconsistent, then shutdown of reporting to the police;
S3, judge that whether frequency variation signal is synchronous with power frequency component frequency and whether phase place is synchronous, if the Frequency Synchronization of frequency variation signal and power frequency component and Phase synchronization, then enter step S4, if the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, then according to phase place, the frequency of frequency variation signal and power frequency component, send synchronic command to high voltage converter 1, make the frequency of the frequency variation signal of described high voltage converter 1 regulation output, and in the Frequency Synchronization of the frequency variation signal collected and power frequency component and Phase synchronization time, send synchronic command;
S4, receive synchronic command time, judge whether phase compensation completes, if phase compensation completes, enter step S5; If do not complete phase compensation, then determine compensation of phase according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor KM2 disconnects and the 3rd contactor KM3 is closed operate time, make high voltage converter 1 carry out phase compensation with described compensation of phase to its frequency variation signal exported, and send switching command after compensation completes;
S5, high voltage converter 1 receive switching command, perform switching action, within described operate time, successively control the second contactor KM2 disconnection, the 3rd contactor KM3 is closed, and when the 3rd contactor KM3 closes complete, determine that the input of described motor switches to power frequency mode.
Wherein, step S3 achieves before switching to power frequency, control the frequency of the frequency variation signal of described high voltage converter regulation output until the Frequency Synchronization of the described frequency variation signal that collects and power frequency component and Phase synchronization, so, when switching to power frequency, less for the change of its input voltage motor, not easily occur impulse current, step S3 specifically comprises:
S31, judge frequency variation signal and whether the frequency of power frequency component is synchronous and whether phase place is synchronous, if the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, enter step S32 and carry out frequency adjustment, if the Frequency Synchronization of frequency variation signal and power frequency component and Phase synchronization, then send synchronic command, enter step S4;
Wherein, judge that the standard of the Frequency Synchronization of frequency variation signal and power frequency component is: the difference of the frequency of described frequency variation signal and power frequency component is within the scope of first threshold; Judge that the phase locked standard of frequency variation signal and power frequency component is: the difference of the phase place of described frequency variation signal and power frequency component is within the scope of Second Threshold.This synchronization criterion is that first threshold chooses 0.5Hz, and Second Threshold is 3-5 ° with reference to this area for synchronous known identification.
If the phase place of S32 frequency variation signal lags behind the phase place of power frequency component, then send the first synchronic command, if the phase place of frequency variation signal is ahead of the phase place of power frequency component, then send the second synchronic command;
After S33, high voltage converter 1 receive the first synchronic command, the frequency of frequency variation signal is increased a first frequency Δ θ 1, after high voltage converter 1 receives the second synchronic command, the frequency of frequency variation signal is reduced a first frequency Δ θ 1, go to step S31.
Wherein, the standard that phase compensation in step S4 completes is: the phase place of frequency variation signal deducts the Phase synchronization with power frequency component after described compensation of phase, with reference to following formula determination compensation of phase: Δ θ=2 π * Δ f*T, Δ θ represents compensation of phase, Δ f represents the frequency decay amplitude of motor in the transient process of power down, and T represents described operate time.T can pre-determine before high voltage converter 1 formally comes into operation, the mensuration of operate time is carried out via disconnection second contactor KM2, closed 3rd contactor KM3, be generally between 100ms to 500ms, Δ f can utilize frequency decay speed and operate time T determine, be generally 0.5Hz.
Step S4 fully takes into account the second contactor KM2 and disconnects, 3rd contactor KM3 closes to be needed to expend certain operate time, within this operate time, motor is in transient process, its motor side back electromotive force there will be decay, therefore, the present invention is before motor power down, phase compensation is carried out to the frequency variation signal exported in Frequency Synchronization and on phase locked basis, to ensure that the voltage of motor still can be synchronous with the power frequency component of input after the decay within operate time, impulse current can not be produced when switching power frequency, motor can not be damaged, also therefore without the need to increasing reactor.
With reference to figure 5, step S4 specifically comprises:
S41, receive synchronic command, start phase compensation;
S42, judge that whether the phase place of frequency variation signal is synchronous with the phase place of power frequency component after deducting described compensation of phase, if so, then judge that phase compensation completes, send switching command and also enter step S5, if not, then enter step S43;
S43, judge that the phase place of frequency variation signal to deduct after described compensation of phase the phase place of whether delayed power frequency component, if so, then send positive frequency instruction to high voltage converter 1, if not, then send negative frequency instruction to high voltage converter 1;
S44, high voltage converter 1 increase the frequency of frequency variation signal when receiving positive frequency instruction, be specially and the frequency of frequency variation signal is increased a second frequency Δ θ 2; Reduce the frequency of frequency variation signal when receiving negative frequency instruction, be specially and the frequency of frequency variation signal is reduced a second frequency Δ θ 2, go to step S42.
The precision of the second frequency Δ θ 2 of step S44 is higher than the first frequency Δ θ 1 in step S33, because θ is smaller for compensation of phase Δ, required precision during frequency modulation is high, so require that second frequency Δ θ 2 is smaller, and during Phase synchronization, require that the speed regulated is fast as much as possible, therefore first frequency Δ θ 1 can not be too little.
Wherein, step S5 specifically comprises:
S51, high voltage converter 1 receive switching command, send breaking signal to the second contactor KM2;
Perform breaking operation when S52, the second contactor KM2 receive breaking signal and feed back when disconnecting completely breaking signal to high voltage converter 1;
S53, high voltage converter 1 send switching signal to the 3rd contactor KM3 when receiving the breaking signal of the second contactor KM2 feedback;
Perform closing operation when S54, the 3rd contactor KM3 receive switching signal and feed back when completely closed switching signal to high voltage converter 1;
S55, high voltage converter 1 receive the switching signal of the 3rd contactor KM3 feedback and determine that the input of described motor switches to power frequency mode.
Described operate time is: high voltage converter 1 receives the time corresponding to the process of the switching signal that the 3rd contactor KM3 feeds back to the second contactor KM2 transmission breaking signal to high voltage converter 1.
Preferably, in step sl, the voltage magnitude of frequency variation signal and power frequency component can also be gathered, in step S3, can also whether synchronously judge amplitude further, namely meet: the difference of frequency is within the scope of first threshold, and the difference of phase place is within the scope of Second Threshold, and the difference of voltage magnitude is in the 3rd threshold range simultaneously.
In sum, the present invention is before switching to power frequency, controlling high voltage converter regulates the frequency of frequency variation signal until the Frequency Synchronization of frequency variation signal and power frequency component and Phase synchronization, so, when switching to power frequency, for motor, the change of its motor side back electromotive force is less, not easily there is impulse current, and consider that the second contactor disconnects, 3rd contactor closes to be needed to expend certain operate time, within this operate time, motor is in transient process, its motor side back electromotive force there will be decay, therefore, the present invention is before the second contactor that Electric Machine Control frequency variation signal inputs disconnects, phase compensation is carried out to the frequency variation signal exported in Frequency Synchronization and on phase locked basis, to ensure that motor side back electromotive force still can be synchronous with the power frequency component of input after the decay within operate time, finally reach motor and put into real Phase synchronization common frequency power network time of running, the present invention can not produce impulse current when switching power frequency, motor can not be damaged, also therefore without the need to increasing reactor.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. a high voltage converter frequency conversion switches to the control method of power frequency, for the input of motor is switched to power frequency mode from conversion system, it is characterized in that, described motor is connected to high voltage bus via the 3rd contactor (KM3), described motor is connected with high voltage converter (1) via the second contactor (KM2), described high voltage converter (1) is connected with high voltage bus via the first contactor (KM1), said method comprising the steps of:
Phase sequence, phase place, the frequency of a frequency variation signal that (), the phase sequence gathering the power frequency component of high voltage bus side, phase place, frequency and high voltage converter (1) export;
(b), when frequency variation signal is consistent with the phase sequence of power frequency component, judge that whether frequency variation signal is synchronous with the frequency of power frequency component and whether phase place is synchronous, and the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, according to phase place, the frequency of frequency variation signal and power frequency component, make described high voltage converter (1) regulate the frequency of frequency variation signal, and in the Frequency Synchronization of the described frequency variation signal collected and power frequency component and Phase synchronization time perform step (c);
(c), determine compensation of phase according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor (KM2) disconnects and the 3rd contactor (KM3) is closed operate time, make described high voltage converter (1) carry out phase compensation with described compensation of phase to the frequency variation signal exported, and perform step (d) after phase compensation completes;
D (), control high voltage converter (1) perform switching action, successively control the second contactor (KM2) disconnection, the 3rd contactor (KM3) is closed within described operate time.
2. high voltage converter frequency conversion according to claim 1 switches to the control method of power frequency, and it is characterized in that, the compensation of phase in described step (c) is determined according to following formula:
Δθ＝2π*Δf*T
Wherein, Δ θ represents compensation of phase, and Δ f represents the frequency decay amplitude of motor in the transient process of power down, and T represents described operate time.
3. high voltage converter frequency conversion according to claim 1 switches to the control method of power frequency, it is characterized in that, the described high voltage converter (1) that makes in described step (c) carries out phase compensation with described compensation of phase comprise the frequency variation signal exported: compare with the phase place of power frequency component after the phase place of the frequency variation signal of Real-time Collection is deducted described compensation of phase
And the phase place of the phase place of frequency variation signal deduct described compensation of phase after delayed power frequency component not synchronous with the phase place of power frequency component after if the phase place of frequency variation signal deducts described compensation of phase, then send positive frequency instruction to high voltage converter (1), described high voltage converter (1) receives positive frequency instruction and increases the frequency of frequency variation signal;
The phase place of and the phase place of frequency variation signal not synchronous with the phase place of power frequency component advanced power frequency component after deducting described compensation of phase after if the phase place of frequency variation signal deducts described compensation of phase, then send negative frequency instruction to high voltage converter (1), described high voltage converter (1) receives negative frequency instruction and reduces the frequency of frequency variation signal;
If the phase place of frequency variation signal deducts the Phase synchronization with power frequency component after described compensation of phase, then determine that phase compensation completes, send switching command to high voltage converter (1).
4. high voltage converter frequency conversion according to claim 3 switches to the control method of power frequency, it is characterized in that, controlling the process that the second contactor (KM2) disconnects, the 3rd contactor (KM3) is closed in described step (d) is:
High voltage converter (1) receives described switching command, sends breaking signal to the second contactor (KM2);
Perform breaking operation when second contactor (KM2) receives breaking signal and feed back when disconnecting completely breaking signal to high voltage converter (1);
High voltage converter (1) sends switching signal to the 3rd contactor (KM3) when receiving the breaking signal that the second contactor (KM2) feeds back;
Perform closing operation when 3rd contactor (KM3) receives switching signal and feed back when completely closed switching signal to high voltage converter (1);
High voltage converter (1) receives switching signal that the 3rd contactor (KM3) feeds back and determines that the input of described motor switches to power frequency mode.
5. high voltage converter frequency conversion according to claim 4 switches to the control method of power frequency, it is characterized in that, described operate time sends time corresponding to process that breaking signal to high voltage converter (1) receives the switching signal that the 3rd contactor (KM3) feeds back to the second contactor (KM2) for: high voltage converter (1).
6. high voltage converter frequency conversion according to claim 1 switches to the control method of power frequency, it is characterized in that,
The standard of the Frequency Synchronization of described frequency variation signal and power frequency component is: the difference of the frequency of described frequency variation signal and power frequency component is within the scope of first threshold;
The phase locked standard of described frequency variation signal and power frequency component is: the difference of the phase place of described frequency variation signal and power frequency component is within the scope of Second Threshold.
7. high voltage converter frequency conversion according to claim 6 switches to the control method of power frequency, it is characterized in that, the described high voltage converter (1) that makes in described step (b) regulates the frequency of frequency variation signal to comprise: by the phase place of the frequency variation signal of Real-time Collection and power frequency component, frequency is corresponding respectively compares
If frequency and/or the phase place of frequency variation signal and power frequency component are asynchronous, and the phase place of the delayed phase power frequency component of frequency variation signal, then send the first synchronic command to high voltage converter (1), described high voltage converter (1) receives the first synchronic command and increases the frequency of frequency variation signal;
If frequency and/or the phase place of frequency variation signal and power frequency component are asynchronous, and the phase place of the advanced power frequency component of the phase place of frequency variation signal, then send the second synchronic command to high voltage converter (1), described high voltage converter (1) receives the second synchronic command and reduces the frequency of frequency variation signal.
8. a high voltage converter frequency conversion switches to the control system of power frequency, for the input of motor is switched to power frequency mode from conversion system, it is characterized in that, this system comprises: high voltage converter (1), first contactor (KM1), second contactor (KM2), 3rd contactor (KM3), described motor is connected to high voltage bus via the 3rd contactor (KM3), described motor is connected with high voltage converter (1) via the second contactor (KM2), described high voltage converter (1) is connected with high voltage bus via the first contactor (KM1),
This system also comprises acquisition module (21), synchronization module (22), phase compensation block (23):
Acquisition module (21), for gathering phase sequence, phase place, the frequency of the frequency variation signal that the phase sequence of the power frequency component of high voltage bus side, phase place, frequency and high voltage converter (1) export;
Synchronization module (22), for when frequency variation signal is consistent with the phase sequence of power frequency component, judge that whether frequency variation signal is synchronous with the frequency of power frequency component and whether phase place is synchronous, and the frequency of frequency variation signal and power frequency component and/or phase place asynchronous time, according to the phase place of frequency variation signal and power frequency component, frequency, sending synchronic command to described high voltage converter (1) makes described high voltage converter (1) regulate the frequency of frequency variation signal, and in the Frequency Synchronization of described frequency variation signal and power frequency component and Phase synchronization time send synchronic command to phase compensation block (23),
Phase compensation block (23), for synchronic command described in receiving, compensation of phase is determined according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor (KM2) disconnects and the 3rd contactor (KM3) is closed operate time, and send compensating instruction to described high voltage converter (1), and when phase compensation completes, send switching command to high voltage converter (1);
High voltage converter (1), for the frequency that receives the frequency variation signal of described synchronic command regulation output to make the Frequency Synchronization of described frequency variation signal and power frequency component and Phase synchronization, and receive described compensating instruction and with described compensation of phase, phase compensation carried out to the frequency variation signal exported, and receive described switching command and perform switching action, within described operate time, successively control the second contactor (KM2) disconnection, the 3rd contactor (KM3) is closed.
9. high voltage converter frequency conversion according to claim 8 switches to the control system of power frequency, and it is characterized in that, described compensating instruction comprises: positive frequency instruction and negative frequency instruction; Described phase compensation block (23) comprises compensation of phase and calculates unit (231) and phase comparison unit (232);
Compensation of phase calculates unit (231), for determining compensation of phase according to the frequency decay amplitude of described motor in the transient process of power down and the second contactor (KM2) disconnects and the 3rd contactor (KM3) is closed operate time, described compensation of phase is determined according to following formula: Δ θ=2 π * Δ f*T, wherein, Δ θ represents compensation of phase, Δ f represents the frequency decay amplitude of motor in the transient process of power down, and T represents described operate time;
Phase comparison unit (232), for synchronic command described in receiving, compare with the phase place of power frequency component after the phase place of the frequency variation signal of Real-time Collection is deducted described compensation of phase, and the phase place of the phase place of frequency variation signal deduct described compensation of phase after delayed power frequency component not synchronous with the phase place of power frequency component after if the phase place of frequency variation signal deducts described compensation of phase, then send positive frequency instruction to high voltage converter (1); If the phase place of and the phase place of frequency variation signal not synchronous with the phase place of power frequency component advanced power frequency component after deducting described compensation of phase after the phase place of frequency variation signal deducts described compensation of phase, then send negative frequency instruction to high voltage converter (1); If the phase place of frequency variation signal deducts the Phase synchronization with power frequency component after described compensation of phase, then determine that phase compensation completes, stop the comparison of phase place, send switching command to high voltage converter (1).
10. high voltage converter frequency conversion according to claim 9 switches to the control system of power frequency, it is characterized in that, described high voltage converter (1) comprising: synchronization frequency modulation unit, compensation frequency modulation unit, switch control unit;
Synchronization frequency modulation unit, for receiving described synchronic command, the frequency of the frequency variation signal of regulation output is to make the Frequency Synchronization of described frequency variation signal and power frequency component and Phase synchronization;
Compensate frequency modulation unit, for receiving described positive frequency instruction and increasing the frequency of frequency variation signal, and receive described negative frequency instruction and reduce the frequency of frequency variation signal;
Switch control unit, for receiving switching command and sending breaking signal to the second contactor (KM2), and receive the second contactor (KM2) breaking signal fed back and send switching signal to the 3rd contactor (KM3), and receive the switching signal that sends of the 3rd contactor (KM3) and determine that the input of described motor switches to power frequency mode
Described operate time sends time corresponding to breaking signal to the process receiving the switching signal that the 3rd contactor (KM3) feeds back to the second contactor (KM2) for: switch control unit.
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