CN113224938B - Loaded starting method, system and device of auxiliary converter - Google Patents
Loaded starting method, system and device of auxiliary converter Download PDFInfo
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- CN113224938B CN113224938B CN202010071700.5A CN202010071700A CN113224938B CN 113224938 B CN113224938 B CN 113224938B CN 202010071700 A CN202010071700 A CN 202010071700A CN 113224938 B CN113224938 B CN 113224938B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/34—Arrangements for starting
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a loaded starting method of an auxiliary converter, wherein the auxiliary converter is boosted at a fixed frequency, when the output current of the auxiliary converter is increased to a preset maximum current threshold, a motor load rotates but the starting torque is insufficient, the output current of the auxiliary converter is not waited to be reduced at the moment, the voltage output of the auxiliary converter is directly cut off, and the auxiliary converter is controlled to output the rated voltage under the rated output frequency immediately, so that the starting torque is given to the motor load instantly on the basis of the rotating motor load, the output overcurrent fault cannot be caused under the condition, the auxiliary converter can normally and quickly start the motor load, the system is ensured to give traction force in time, the vehicle is prevented from falling into a phase separation area, and the safety of vehicle operation is improved. The invention also discloses a system and a device for starting the auxiliary converter with the load, and the system and the device have the same beneficial effects as the method for starting the auxiliary converter with the load.
Description
Technical Field
The invention relates to the field of regulation and control of an auxiliary converter, in particular to a method, a system and a device for starting the auxiliary converter with a load.
Background
The auxiliary converter is an important component of a traction electric transmission system of a rail transit vehicle and is mainly used for supplying power to auxiliary equipment such as a traction fan, a converter cooling fan and the like on the vehicle. In general, the auxiliary converter has a redundant design, and when the main auxiliary converter fails, the standby auxiliary converter supplies power. In the prior art, an auxiliary converter usually employs a variable frequency Voltage (VVVF) starting strategy (that is, an output Voltage of the auxiliary converter varies in proportion to an output frequency of the auxiliary converter) to start a three-phase asynchronous motor load, where a sign of normal start of the motor load is that an output frequency and an output Voltage of the auxiliary converter rise to a rated value, that is, the VVVF starting strategy is that the output frequency and the output Voltage of the auxiliary converter rise to the rated value by adjusting the output frequency and the output Voltage of the auxiliary converter.
However, if the starting torque at the initial stage of the motor load start is insufficient and the output voltage rising rate of the auxiliary converter is large, the output current of the auxiliary converter rises too fast, which easily causes the output current of the auxiliary converter to reach the maximum output current for system safety. Once the output current of the auxiliary converter reaches the maximum output current, the adopted technical means is as follows: the frequency boosting and voltage boosting operation is not carried out any more, and the frequency boosting and voltage boosting operation is carried out after the output current of the auxiliary converter is reduced by a certain value, so that the load starting speed is low due to the technical means. However, if the load is started slowly, the system cannot give out traction force in time, and for the conditions of heavy load of the vehicle, running of the vehicle on a long slope and the like, if the traction force is not given in time, the vehicle has the risk of falling into a phase separation area, so that the running safety of the vehicle is reduced.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a loaded starting method, a loaded starting system and a loaded starting device of an auxiliary converter, which can not cause output overcurrent faults, and can normally and quickly start a motor load by the auxiliary converter, so that the system can timely give traction force to prevent a vehicle from falling into a phase separation region, and the running safety of the vehicle is improved.
In order to solve the technical problem, the invention provides a loaded starting method of an auxiliary converter, which comprises the following steps:
after a starting instruction of a target auxiliary converter is received, controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under a rated output frequency;
judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not;
if not, returning to the step of controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency;
if so, cutting off the voltage output of the target auxiliary converter, and then controlling the target auxiliary converter to output the rated voltage under the rated output frequency so as to normally start the load of the target auxiliary converter.
Preferably, the process of controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter at the rated output frequency comprises the following steps:
carrying out dq coordinate transformation on the three-phase output phase voltage set value of the target auxiliary converter to obtain a d-axis output voltage set value V of the target auxiliary converter* LdAnd q-axis output voltage set value V* Lq(ii) a Wherein, the given value of the three-phase output phase voltage continuously increases;
carrying out dq coordinate transformation on the actual value of the three-phase output phase voltage and the actual value of the three-phase output phase current of the target auxiliary converter to obtain the actual value V of the d-axis output voltage of the target auxiliary converterLdQ-axis output voltage actual value VLqD-axis actual output current value iLdQ-axis output voltage actual value iLq；
Will V* LsAnd VLsObtaining an s-axis output voltage error by performing difference making, and obtaining an s-axis regulating current after the s-axis output voltage error is subjected to PI regulation; wherein s ═ d, q;
adjusting the s-axis by a current and iLsAdding to obtain s-axis modulation output current given value i* lsAnd will i* lsModulating the actual value i of the output current with the s-axislsMake a differenceModulating an output current error to an s axis, and carrying out PI regulation on the s axis modulation output current error to obtain an s axis regulation voltage;
adjusting the s-axis to a voltage and VLsAdding to obtain s-axis modulation output voltage VlsAnd will VldAnd VlqAnd modulating by a space vector PWM algorithm to obtain an inversion pulse, and controlling the target auxiliary converter to work according to the inversion pulse so as to enable the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency.
Preferably, in the step of* ldD-axis modulation of the actual value of the output current ildBefore the difference, the loaded starting method further comprises the following steps:
will VLqObtaining d-axis current compensation value after filtering phase capacitance filtering, and adjusting the d-axis current and iLdSubtracting the d-axis current compensation value from the added value to obtain a d-axis modulation output current given value i* ld。
Preferably, when V is to beldAnd VlqBefore the inversion pulse is obtained by the modulation of the space vector PWM algorithm, the loaded starting method further comprises the following steps:
will ilqFiltering with filter phase inductor to obtain d-axis voltage compensation value, and regulating voltage and V of d-axisLdSubtracting the d-axis voltage compensation value from the added value to obtain a d-axis modulation output voltage Vld。
Preferably, in the reaction of i* lqModulating the actual value i of the output current with the q axislqBefore the difference is made, the loaded starting method further comprises the following steps:
will VLdObtaining a q-axis current compensation value after filtering phase capacitance filtering, and regulating the q-axis current and iLqAdding the added value of the q-axis current compensation value to obtain a given value i of the q-axis modulation output current* lq。
Preferably, when V is to beldAnd VlqBefore the inversion pulse is obtained by the modulation of the space vector PWM algorithm, the loaded starting method further comprises the following steps:
will ildFiltered by a filter phase inductor to obtainCompensating the q-axis voltage and adjusting the q-axis voltage to VLqAdding the added value of the q-axis voltage compensation value to obtain a q-axis modulation output voltage Vlq。
Preferably, the loaded starting method further comprises:
and starting timing when the starting instruction is received, and stopping timing after the load of the target auxiliary converter is normally started to obtain the load starting time of the target auxiliary converter.
In order to solve the above technical problem, the present invention further provides a loaded start-up system of an auxiliary converter, including:
the command receiving module is used for receiving a starting command of the target auxiliary converter and executing the voltage control module after receiving the starting command;
the voltage control module is used for controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency;
the current judgment module is used for judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not; if not, returning to execute the voltage control module; if yes, executing a load starting module;
and the load starting module is used for cutting off the voltage output of the target auxiliary converter and then controlling the target auxiliary converter to output a rated voltage at a rated output frequency so as to normally start the load of the target auxiliary converter.
In order to solve the above technical problem, the present invention further provides a loaded starting apparatus of an auxiliary converter, including:
a memory for storing a computer program;
a processor for implementing the steps of any of the above-described methods of starting an auxiliary converter with load when executing said computer program.
The invention provides a loaded starting method of an auxiliary converter, wherein the auxiliary converter is boosted at a fixed frequency, when the output current of the auxiliary converter is increased to a preset maximum current threshold, a motor load rotates but the starting torque is insufficient, the output current of the auxiliary converter is not waited to be reduced at the moment, the voltage output of the auxiliary converter is directly cut off, and the auxiliary converter is controlled to output the rated voltage under the rated output frequency immediately, so that the starting torque is provided for the motor load instantly on the basis of the rotating motor load, the condition can not cause an output overcurrent fault, the auxiliary converter can normally and quickly start the motor load, the system is ensured to give traction force in time, the vehicle is prevented from falling into a phase separation area, and the safety of vehicle operation is improved.
The invention also provides a system and a device for starting the auxiliary converter with the load, and the system and the device have the same beneficial effects as the method for starting the auxiliary converter with the load.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a method for starting an auxiliary converter with load according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a constant-frequency boost control of an auxiliary converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a main structure of an auxiliary converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a loaded start-up system of an auxiliary converter according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a loaded starting method, a system and a device of an auxiliary converter, which can not cause output overcurrent faults, and simultaneously, the auxiliary converter can normally and quickly start the motor load, thereby ensuring that the system can give traction force in time, avoiding vehicles falling into a phase separation region and improving the safety of vehicle operation.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for starting an auxiliary converter with load according to an embodiment of the present invention.
The loaded starting method of the auxiliary converter comprises the following steps:
step S1: and receiving a starting command of the target auxiliary converter.
Step S2: and the control target auxiliary converter continuously increases the output voltage of the control target auxiliary converter under the rated output frequency.
Step S3: judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not; if not, returning to execute the step S2; if yes, go to step S4.
Step S4: and cutting off the voltage output of the target auxiliary converter, and then controlling the target auxiliary converter to output the rated voltage at the rated output frequency so as to normally start the load of the target auxiliary converter.
In particular, systems often include a plurality of auxiliary converters, and when an operating auxiliary converter fails, its operation is taken over by another auxiliary converter. At the moment, the system needs to send a starting instruction corresponding to an auxiliary converter (called a target auxiliary converter) to be operated, and after the starting instruction of the target auxiliary converter is received, the target auxiliary converter is controlled to perform constant-frequency boosting operation, namely the target auxiliary converter is controlled to continuously boost the output voltage of the target auxiliary converter under the rated output frequency.
In the process of increasing the output voltage of the target auxiliary converter, the output current of the target auxiliary converter is gradually increased due to the large slip of the load motor. In the fixed-frequency boosting process, the output current of the target auxiliary converter is detected in real time, whether the output current of the target auxiliary converter reaches a preset maximum current threshold value or not is judged, and if the output current of the target auxiliary converter does not reach the preset maximum current threshold value, the target auxiliary converter is controlled to continue fixed-frequency boosting operation; if the preset maximum current threshold is reached, immediately cutting off the voltage output of the target auxiliary converter, and then immediately controlling the target auxiliary converter to output the rated voltage under the rated output frequency, so that the auxiliary converter can normally start the motor load.
The principle of the auxiliary converter is that the load of the motor can be started normally: considering that when the output current of the target auxiliary converter reaches a preset maximum current threshold value, the output voltage of the target auxiliary converter is lower, so that the motor load rotates but the starting torque is insufficient, and the motor cannot work normally; meanwhile, once the motor load is provided with the starting torque on the basis of rotating, the motor load can be normally started to work, the output current of the target auxiliary converter is gradually reduced due to the fact that the torque of the motor load is fully exerted, and the problem of output overcurrent does not exist.
In addition, the present application may also employ other loaded start-up methods based on this principle: after a starting instruction of the target auxiliary converter is received, controlling the target auxiliary converter to execute frequency boosting and voltage boosting operation based on a frequency conversion and voltage transformation strategy; judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not; if not, returning to the step of executing the frequency and voltage boosting operation of the control target auxiliary converter based on the frequency and voltage conversion strategy; if the target auxiliary converter is in the normal starting state, the voltage output of the target auxiliary converter is cut off, and then the target auxiliary converter is controlled to output the rated voltage under the rated output frequency so as to normally start the load of the target auxiliary converter.
The invention provides a loaded starting method of an auxiliary converter, wherein the auxiliary converter is boosted at a fixed frequency, when the output current of the auxiliary converter is increased to a preset maximum current threshold, a motor load rotates but the starting torque is insufficient, the output current of the auxiliary converter is not waited to be reduced at the moment, the voltage output of the auxiliary converter is directly cut off, and the auxiliary converter is controlled to output the rated voltage under the rated output frequency immediately, so that the starting torque is provided for the motor load instantly on the basis of the rotating motor load, the condition can not cause an output overcurrent fault, the auxiliary converter can normally and quickly start the motor load, the system is ensured to give traction force in time, the vehicle is prevented from falling into a phase separation area, and the safety of vehicle operation is improved.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic diagram illustrating a constant-frequency boost control of an auxiliary converter according to an embodiment of the present invention.
As an alternative embodiment, the process of controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter at the rated output frequency comprises the following steps:
carrying out dq coordinate transformation on the three-phase output phase voltage set value of the target auxiliary converter to obtain a d-axis output voltage set value V of the target auxiliary converter* LdAnd q-axis output voltage set value V* Lq(ii) a Wherein, the given value of the three-phase output phase voltage is continuously increased;
carrying out dq coordinate transformation on the actual value of the three-phase output phase voltage and the actual value of the three-phase output phase current of the target auxiliary converter to obtain the actual value V of the d-axis output voltage of the target auxiliary converterLdQ-axis output voltage actual value VLqD-axis actual output current value iLdQ-axis output voltage actual value iLq；
Will V* LsAnd VLsObtaining an s-axis output voltage error by performing difference making, and obtaining an s-axis regulating current after the s-axis output voltage error is subjected to PI regulation; wherein s ═ d, q;
adjusting the s-axis by the current and iLsAdd to obtainOutput current set value i modulated to s axis* lsAnd will i* lsModulating the actual value i of the output current with the s-axislsObtaining an s-axis modulation output current error by performing difference making, and obtaining an s-axis regulation voltage after the s-axis modulation output current error is subjected to PI regulation;
regulating the s-axis to VLsAdding to obtain s-axis modulation output voltage VlsAnd will VldAnd VlqAnd modulating by a space vector PWM algorithm to obtain an inversion pulse, and controlling the target auxiliary converter to work according to the inversion pulse so as to enable the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency.
Specifically, the fixed-frequency boosting process of the present application includes: on the basis that the target auxiliary converter keeps the rated output frequency, the three-phase output phase voltage set value (continuously increased) of the target auxiliary converter is obtained, and dq coordinate transformation is carried out on the three-phase output phase voltage set value to obtain the d-axis output voltage set value V of the target auxiliary converter* LdAnd q-axis output voltage set value V* Lq(ii) a Detecting the actual value of the three-phase output phase voltage of the target auxiliary converter, and carrying out dq coordinate transformation on the actual value of the three-phase output phase voltage to obtain the actual value V of the d-axis output voltage of the target auxiliary converterLdAnd q-axis output voltage actual value VLq(ii) a Detecting the actual value of the three-phase output phase current of the target auxiliary converter, and carrying out dq coordinate transformation on the actual value of the three-phase output phase current to obtain the actual value i of the d-axis output current of the target auxiliary converterLdAnd q-axis output voltage actual value iLq。
D-axis output voltage given value V* LdAnd d-axis output voltage actual value VLdObtaining a d-axis output voltage error by subtracting, and obtaining a d-axis regulating current after the d-axis output voltage error is regulated by PI (proportional-integral); d-axis regulating current and d-axis output current actual value iLdAdding to obtain a d-axis modulation output current given value i* ldAnd d-axis modulation output current set value i* ldD-axis modulation of the actual value of the output current ildDifferencing to obtain d-axis modulationOutputting the current error, and carrying out PI regulation on the d-axis modulation output current error to obtain a d-axis regulation voltage; the d-axis regulating voltage and the d-axis output voltage actual value V are comparedLdAdding to obtain d-axis modulation output voltage Vld。
In the same way, the given value V of the q-axis output voltage is used* LqAnd q-axis output voltage actual value VLqObtaining a q-axis output voltage error by difference making, and obtaining a q-axis regulating current after the q-axis output voltage error is subjected to PI regulation; the q-axis regulating current and the q-axis output current actual value iLqAdding to obtain a given value i of q-axis modulation output current* lqAnd modulating the q-axis to output a given value of current i* lqModulating the actual value i of the output current with the q axislqObtaining a q-axis modulation output current error by difference making, and obtaining a q-axis regulation voltage after the q-axis modulation output current error is subjected to PI regulation; the q-axis regulating voltage and the q-axis output voltage actual value V are comparedLqAdding the q-axis modulation output voltage Vlq。
Modulating d-axis by output voltage VldAnd q-axis modulated output voltage VlqModulating by a space vector PWM (Pulse Width Modulation) algorithm to obtain an inversion Pulse, and controlling the on-off state of a switch tube in the target auxiliary converter (as shown in FIG. 3, controlling the on-off state of the switch tubes Q1-Q6) according to the inversion Pulse to control the actual value of the three-phase output phase voltage of the target auxiliary converter to track the continuously-increased three-phase output phase voltage set value (namely V* LdContinuously rising to the rated value, V* LqGiven as 0) so that the target auxiliary converter continues to step up its output voltage at the rated output frequency.
As an alternative embodiment, i is* ldD-axis modulation of the actual value of the output current ildBefore the difference is made, the start-up method with load further comprises the following steps:
will VLqObtaining d-axis current compensation value after filtering phase capacitance filtering, and adjusting the d-axis current and iLdSubtracting the d-axis current compensation value from the added value to obtain a d-axis modulation output current given value i* ld。
Further, the d-axis modulation output current given value i of the application* ldD-axis regulating current + d-axis output current actual value iLd-a d-axis current compensation value; wherein the d-axis current compensation value is obtained by outputting an actual voltage value V by the q-axisLqAnd obtaining the product after filtering phase capacitance filtering (wC2 link).
As an alternative embodiment, V isldAnd VlqBefore the inversion pulse is obtained through the modulation of the space vector PWM algorithm, the loaded starting method further comprises the following steps:
will ilqFiltering with filter phase inductor to obtain d-axis voltage compensation value, and regulating voltage and V of d-axisLdSubtracting the d-axis voltage compensation value from the added value to obtain a d-axis modulation output voltage Vld。
Further, the d-axis modulated output voltage V of the present applicationldD-axis regulated voltage + d-axis output voltage actual value VLd-a d-axis voltage compensation value; wherein the d-axis voltage compensation value is modulated by the q-axis to output the actual current value ilqAnd filtering by a filter phase inductor (wL link).
As an alternative embodiment, i is* lqModulating the actual value i of the output current with the q axislqBefore the difference, the loaded starting method further comprises the following steps:
will VLdObtaining a q-axis current compensation value after filtering phase capacitance filtering, and regulating the q-axis current and iLqAdding the added value to a q-axis current compensation value to obtain a given value i of a q-axis modulation output current* lq。
Further, the q-axis modulation output current given value i of the application* lqQ-axis regulation of the current + q-axis output current actual value iLq+ q-axis current compensation values; wherein the q-axis current compensation value is output by the d-axis actual voltage value VLdAnd filtering the mixed solution through filter phase capacitance.
As an alternative embodiment, V isldAnd VlqBefore the inversion pulse is obtained through the modulation of the space vector PWM algorithm, the loaded starting method also comprises the following steps:
will ildFiltered by a filter phase inductor to obtainCompensating the q-axis voltage and adjusting the q-axis voltage to VLqThe added value is added with the q-axis voltage compensation value to obtain a q-axis modulation output voltage Vlq。
Further, the q-axis modulated output voltage V of the present applicationlqQ-axis regulated voltage + q-axis output voltage actual value VLqA + q-axis voltage compensation value; wherein the q-axis voltage compensation value is modulated by the d-axis to output the actual current value ildAnd filtering by a filter phase inductor to obtain the filter.
In summary, the compensation link of the above embodiment is added to the constant-frequency boost control algorithm of the target auxiliary converter, so that the constant-frequency boost process of the target auxiliary converter is more stable and accurate.
As an alternative embodiment, the loaded start-up method further comprises:
and starting timing when the starting instruction is received, and stopping timing after the load of the target auxiliary converter is normally started to obtain the load starting time of the target auxiliary converter.
Further, the timing can be started when a starting instruction of the target auxiliary converter is received, and the timing is stopped after the target auxiliary converter successfully starts the load, so that the timing time is the time duration for the target auxiliary converter to successfully start the load, namely the load starting time of the target auxiliary converter.
In addition, the auxiliary converters in the system can be numbered in advance, so that after the load of the target auxiliary converter is started, the number and the load starting time of the target auxiliary converter are recorded, and the number and the load starting time of the target auxiliary converter are output to a human-computer interaction interface to be displayed for a user to check.
Referring to fig. 4, fig. 4 is a schematic diagram of a loaded start-up system of an auxiliary converter according to an embodiment of the present invention.
The loaded starting system of the auxiliary converter comprises:
the instruction receiving module 1 is used for receiving a starting instruction of the target auxiliary converter and executing the voltage control module after receiving the starting instruction;
the voltage control module 2 is used for controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency;
the current judgment module 3 is used for judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not; if not, returning to execute the voltage control module 2; if yes, executing the load starting module 4;
and the load starting module 4 is used for cutting off the voltage output of the target auxiliary converter and then controlling the target auxiliary converter to output the rated voltage under the rated output frequency so as to normally start the load of the target auxiliary converter.
For introduction of the loaded start-up system provided in the present application, please refer to the above embodiments of the loaded start-up method, which is not described herein again.
The application also provides an auxiliary converter's area load starting drive, includes:
a memory for storing a computer program;
a processor for implementing the steps of any of the above described methods of starting an auxiliary converter with load when executing a computer program.
For introduction of the loaded starting apparatus provided in the present application, please refer to the above embodiments of the loaded starting method, which are not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for starting an auxiliary converter with load, comprising:
after a starting instruction of a target auxiliary converter is received, controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under a rated output frequency;
judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not;
if not, returning to the step of controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency;
if so, cutting off the voltage output of the target auxiliary converter, and then controlling the target auxiliary converter to output the rated voltage under the rated output frequency so as to normally start the load of the target auxiliary converter.
2. The method for starting the auxiliary converter with load as claimed in claim 1, wherein the controlling the target auxiliary converter to continuously increase its output voltage at the rated output frequency comprises:
carrying out dq coordinate transformation on the three-phase output phase voltage set value of the target auxiliary converter to obtain a d-axis output voltage set value V of the target auxiliary converter* LdAnd q-axis output voltage set value V* Lq(ii) a Wherein, the given value of the three-phase output phase voltage is continuously increased;
will be describedCarrying out dq coordinate transformation on the actual value of the three-phase output phase voltage and the actual value of the three-phase output phase current of the target auxiliary converter to obtain the actual value V of the d-axis output voltage of the target auxiliary converterLdQ-axis output voltage actual value VLqD-axis actual output current value iLdQ-axis output voltage actual value iLq；
Will V* LsAnd VLsObtaining an s-axis output voltage error by performing difference making, and obtaining an s-axis regulating current after the s-axis output voltage error is subjected to PI regulation; wherein s ═ d, q;
adjusting the s-axis by a current and iLsAdding to obtain s-axis modulation output current given value i* lsAnd will i* lsModulating the actual value i of the output current with the s-axislsObtaining an s-axis modulation output current error by performing difference making, and obtaining an s-axis regulation voltage after the s-axis modulation output current error is subjected to PI regulation;
adjusting the s-axis to a voltage and VLsAdding to obtain s-axis modulation output voltage VlsAnd will VldAnd VlqAnd modulating by a space vector PWM algorithm to obtain an inversion pulse, and controlling the target auxiliary converter to work according to the inversion pulse so as to enable the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency.
3. The loaded starting method of the auxiliary converter as claimed in claim 2, wherein i is set to* ldD-axis modulation of the actual value of the output current ildBefore the difference, the loaded starting method further comprises the following steps:
will VLqObtaining d-axis current compensation value after filtering phase capacitance filtering, and adjusting the d-axis current and iLdSubtracting the d-axis current compensation value from the added value to obtain a d-axis modulation output current given value i* ld。
4. A method for starting an auxiliary converter with load as claimed in claim 3, characterized in that when V is appliedldAnd VlqModulated by space vector PWM algorithmBefore the inversion pulse is prepared, the loaded starting method further comprises the following steps:
will ilqFiltering with filter phase inductor to obtain d-axis voltage compensation value, and regulating voltage and V of d-axisLdSubtracting the d-axis voltage compensation value from the added value to obtain a d-axis modulation output voltage Vld。
5. The loaded starting method of the auxiliary converter as claimed in claim 4, wherein i is set to* lqModulating the actual value i of the output current with the q axislqBefore the difference, the loaded starting method further comprises the following steps:
will VLdObtaining a q-axis current compensation value after filtering phase capacitance filtering, and regulating the q-axis current and iLqAdding the added value of the q-axis current compensation value to obtain a given value i of the q-axis modulation output current* lq。
6. A method for starting an auxiliary converter with load as claimed in claim 5, characterized in that V is measuredldAnd VlqBefore the inversion pulse is obtained by the modulation of the space vector PWM algorithm, the loaded starting method further comprises the following steps:
will ildFiltering with filter phase inductor to obtain q-axis voltage compensation value, and regulating voltage and V of q-axisLqAdding the added value of the q-axis voltage compensation value to obtain a q-axis modulation output voltage Vlq。
7. The loaded start-up method of an auxiliary converter as claimed in claim 1, wherein said loaded start-up method further comprises:
and starting timing when the starting instruction is received, and stopping timing after the load of the target auxiliary converter is normally started to obtain the load starting time of the target auxiliary converter.
8. A loaded start-up system for an auxiliary converter, comprising:
the command receiving module is used for receiving a starting command of the target auxiliary converter and executing the voltage control module after receiving the starting command;
the voltage control module is used for controlling the target auxiliary converter to continuously increase the output voltage of the target auxiliary converter under the rated output frequency;
the current judgment module is used for judging whether the output current of the auxiliary converter is increased to a preset maximum current threshold value or not; if not, returning to execute the voltage control module; if yes, executing a load starting module;
and the load starting module is used for cutting off the voltage output of the target auxiliary converter and then controlling the target auxiliary converter to output rated voltage under rated output frequency so as to normally start the load of the target auxiliary converter.
9. A loaded starting apparatus for an auxiliary converter, comprising:
a memory for storing a computer program;
processor for implementing the steps of the loaded starting method of an auxiliary converter according to any of claims 1-7 when executing said computer program.
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