CN112356741A - Feedback control method and system based on PWM energy feedback converter - Google Patents
Feedback control method and system based on PWM energy feedback converter Download PDFInfo
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- CN112356741A CN112356741A CN202011313326.1A CN202011313326A CN112356741A CN 112356741 A CN112356741 A CN 112356741A CN 202011313326 A CN202011313326 A CN 202011313326A CN 112356741 A CN112356741 A CN 112356741A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/06—Arrangements for consuming regenerative power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention discloses a feedback control method and system based on a PWM energy feedback converter. The method comprises the steps that a direct current side of the PWM energy feedback converter is connected into a direct current contact network, and an alternating current side is connected into an alternating current power grid through a transformer; detecting two direct current contact network voltages in a time sliding window; calculating a voltage change value delta U of the direct-current contact network; comparing the voltage change value delta U of the direct-current contact net with a preset condition of a control system, and judging the working condition of the system; and if the direct current voltage value meets the preset system working condition and reaches the set threshold value, the PWM energy feedback converter carries out real-time adjustment according to the judgment result. The system comprises an energy-feedback converter access device, a voltage detection device, a voltage change calculation device, a working condition judgment device and an adjustment device. The method judges the running state of the train through the change of the voltage of the direct current contact network, solves the problems of stability and reliability in the engineering application of the PWM converter, controls the accurate input of the PWM rectifier, achieves the aim of saving energy of a power supply system, and has simple and accurate criterion.
Description
Technical Field
The invention relates to the technical field of urban rail transit power supply, in particular to a feedback control method and system based on a PWM energy feedback converter.
Background
In the existing urban rail transit power supply system, a diode rectifier is generally adopted as a power supply source of a train. The diode rectifier has the advantages of high efficiency, large capacity, strong overload capacity and the like, and has the defects of uncontrollable output voltage, large ripple, incapability of absorbing and utilizing regenerative braking energy due to unidirectional energy flow and the like. When the train starts to run, the diode rectifier rectifies and works to provide traction energy for the train, when the train brakes, the train is in a braking power generation mode, the voltage of a direct current bus is lifted, the voltage of a contact network fluctuates in a certain range along with the change of the load size of the train on the contact network, and the PWM converter feeds back the electric quantity for braking the train to an alternating current power grid by detecting the change and the change slope of the voltage of the direct current bus. However, the PWM converter is prone to cause misjudgment, and forms a power circulation with the diode rectifier set, which is difficult to accurately judge the train operation state, and is not favorable for energy utilization of the rail power supply system.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a feedback control method and system based on a PWM energy feedback converter, which can accurately determine an operating state of a train according to a change condition of a dc contact network voltage, avoid a PWM converter misjudging and a diode rectifier set from forming a power circulation, and solve the problems of stability and reliability in the engineering application of the PWM converter, so as to control the PWM rectifier to be accurately put into use, achieve the purpose of energy saving of a power supply system, and make a simple and accurate criterion.
In a first aspect, an embodiment of the present invention provides a feedback control method based on a PWM energy-fed converter, including:
the direct current side of the PWM energy feedback converter is connected into a direct current contact network, and the alternating current side is connected into an alternating current power grid through a transformer.
And detecting the voltages of the two direct current contact networks in the time sliding window.
And calculating the voltage change value delta U of the direct-current contact net.
And comparing the voltage change value delta U of the direct-current contact net with a preset condition of the control system, and judging the working condition of the system.
And if the direct current voltage value meets the preset system working condition and reaches the set threshold value, the PWM energy feedback converter carries out real-time adjustment according to the judgment result.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the comparing the voltage variation value Δ U of the dc link system with a preset condition of a control system to determine a system operating condition includes:
and if the voltage change value delta U is less than or equal to delta 1, judging that the voltage fluctuation of the power supply network or the voltage fluctuation caused by the rectification of the diode rectifier causes the voltage fluctuation of the contact network.
And if the voltage change value delta U is less than 0 and the absolute value delta 1 of the voltage change value is less than or equal to delta U and less than or equal to delta 2, judging that the voltage fluctuation of the overhead contact system is caused by the traction starting of the train.
If the voltage change value delta U is larger than 0 and the absolute value delta 2 of the voltage change value is smaller than the absolute value delta U and smaller than or equal to delta 3, the voltage fluctuation of the traction network caused by train braking is judged.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where if the dc voltage value meets the preset system condition and reaches the set threshold, the PWM energy-fed converter performs real-time adjustment according to the determination result, including:
if the voltage change value delta U is larger than 0, the absolute value delta U of the voltage change value delta 2 is smaller than or equal to delta U and smaller than or equal to delta 3, and the direct current voltage value is larger than the no-load voltage value of the direct current contact net, the PWM energy feedback converter is started, and the energy of the direct current contact net is fed back to the alternating current power grid.
If the voltage change value delta U is more than 0, the absolute value delta U of the voltage change value delta 2 is less than or equal to delta U and less than or equal to delta 3, and the direct current voltage value is greater than the preset voltage threshold value of the PWM energy feedback converter, the PWM energy feedback converter is started, and the energy of the direct current contact net is fed back to the alternating current power grid.
If the voltage change value 0 & ltdelta U & gt is less than or equal to delta 1, the threshold value of the starting voltage is increased in the positive direction, and the PWM energy-fed converter maintains a standby state.
If the voltage change value delta U is less than or equal to 0, the threshold value of the starting voltage is reversely reduced, and the PWM energy-fed converter maintains the standby state.
In a second aspect, an embodiment of the present invention further provides a feedback control system based on a PWM energy-fed converter, including:
the energy feedback converter access device is characterized in that a PWM energy feedback converter direct current side is accessed to a direct current contact network, and an alternating current side is accessed to an alternating current power grid through a transformer.
And the voltage detection device is used for detecting the voltages of the two direct current contact networks in the time sliding window.
And the voltage change calculating device is used for calculating the voltage change value delta U of the direct-current contact network.
And the working condition judgment device is used for comparing the voltage change value delta U of the direct-current contact network with the preset condition of the control system and judging the working condition of the system.
And if the adjusting device accords with the preset system working condition and the direct-current voltage value reaches the set threshold value, the PWM energy feedback converter performs real-time adjustment according to the judgment result.
With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the operating condition determining device includes:
and the system voltage fluctuation judging module is used for judging that the voltage fluctuation of the power supply network or the voltage fluctuation caused by the rectification of the diode rectifier causes the voltage fluctuation of the contact network if the voltage change value delta U is less than or equal to delta 1.
And the train traction starting judgment module is used for judging that the voltage fluctuation of the contact net is caused by the train traction starting if the voltage change value delta U is less than 0 and the absolute value delta 1 of the voltage change value is less than or equal to delta U and less than or equal to delta 2.
And the train braking judgment module is used for judging that the train braking causes the voltage fluctuation of the traction network if the voltage change value delta U is more than 0 and the absolute value delta 2 of the voltage change value is less than or equal to delta U and less than or equal to delta 3.
With reference to the second aspect, an embodiment of the present invention provides a second possible implementation manner of the second aspect, where the adjusting device includes:
and the no-load voltage comparison module is used for starting the PWM energy feedback converter and feeding back the energy of the direct current contact network to the alternating current power grid if the voltage change value delta U is greater than 0, the absolute value delta 2 of the voltage change value is less than delta U and less than or equal to delta 3, and the direct current voltage value is greater than the no-load voltage value of the direct current contact network.
And the converter voltage comparison module is used for starting the PWM energy feedback converter and feeding back the energy of the direct current contact net to the alternating current power grid if the voltage change value delta U is greater than 0, the absolute value delta 2 of the voltage change value is less than delta U and less than or equal to delta 3, and the direct current voltage value is greater than the preset voltage threshold value of the PWM energy feedback converter.
And the voltage change value comparison module is used for positively increasing the threshold value of the starting voltage and keeping the PWM energy-fed converter in a standby state if the voltage change value is 0 and less than or equal to delta U and less than or equal to delta 1, and reversely reducing the threshold value of the starting voltage and keeping the PWM energy-fed converter in the standby state if the voltage change value is less than or equal to delta U and less than or equal to 0.
The embodiment of the invention has the beneficial effects that:
the method accurately judges the running state of the train according to the change condition of the voltage of the direct-current contact network, avoids the error judgment of the PWM converter and the formation of power circulation with the diode rectifier unit, solves the problems of stability and reliability in the engineering application of the PWM converter, controls the accurate input of the PWM converter, achieves the aim of saving energy of a power supply system, and has simple and accurate judgment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The feedback control method and system based on the PWM energy-fed converter according to the present invention will be described in detail with reference to the accompanying drawings and the following detailed description.
Fig. 1 is a flow chart of a feedback control method based on a PWM energy-fed converter according to the present invention;
fig. 2 is a schematic diagram of an access structure of the PWM energy-fed converter of the present invention.
Detailed Description
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. The components of embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1 to 2, a first embodiment of the present invention provides a feedback control method based on a PWM energy-fed converter, including:
the direct current side of the PWM energy feedback converter is connected into a direct current contact network, and the alternating current side is connected into an alternating current power grid through a transformer.
And detecting the voltages of the two direct current contact networks in the time sliding window.
And calculating the voltage change value delta U of the direct-current contact net.
And comparing the voltage change value delta U of the direct-current contact net with a preset condition of the control system, and judging the working condition of the system.
And if the direct current voltage value meets the preset system working condition and reaches the set threshold value, the PWM energy feedback converter carries out real-time adjustment according to the judgment result.
Wherein, the comparison direct current contact net voltage variation value delta U and control system's preset condition judge the system operating mode, include:
and if the voltage change value delta U is less than or equal to delta 1, judging that the voltage fluctuation of the power supply network or the voltage fluctuation caused by the rectification of the diode rectifier causes the voltage fluctuation of the contact network.
And if the voltage change value delta U is less than 0 and the absolute value delta 1 of the voltage change value is less than or equal to delta U and less than or equal to delta 2, judging that the voltage fluctuation of the overhead contact system is caused by the traction starting of the train.
If the voltage change value delta U is larger than 0 and the absolute value delta 2 of the voltage change value is smaller than the absolute value delta U and smaller than or equal to delta 3, the voltage fluctuation of the traction network caused by train braking is judged.
Wherein, if accord with preset system's operating mode, direct current voltage value reaches the settlement threshold value simultaneously, then PWM can present the converter and carry out real-time adjustment according to the judged result, include:
if the voltage change value delta U is larger than 0, the absolute value delta U of the voltage change value delta 2 is smaller than or equal to delta U and smaller than or equal to delta 3, and the direct current voltage value is larger than the no-load voltage value of the direct current contact net, the PWM energy feedback converter is started, and the energy of the direct current contact net is fed back to the alternating current power grid.
If the voltage change value delta U is more than 0, the absolute value delta U of the voltage change value delta 2 is less than or equal to delta U and less than or equal to delta 3, and the direct current voltage value is greater than the preset voltage threshold value of the PWM energy feedback converter, the PWM energy feedback converter is started, and the energy of the direct current contact net is fed back to the alternating current power grid.
If the voltage change value 0 & ltdelta U & gt is less than or equal to delta 1, the threshold value of the starting voltage is increased in the positive direction, and the PWM energy-fed converter maintains a standby state.
If the voltage change value delta U is less than or equal to 0, the threshold value of the starting voltage is reversely reduced, and the PWM energy-fed converter maintains the standby state.
Referring to fig. 1 to 2, a second embodiment of the present invention provides a feedback control system based on a PWM energy-fed converter, including:
the energy feedback converter access device is characterized in that a PWM energy feedback converter direct current side is accessed to a direct current contact network, and an alternating current side is accessed to an alternating current power grid through a transformer.
And the voltage detection device is used for detecting the voltages of the two direct current contact networks in the time sliding window.
And the voltage change calculating device is used for calculating the voltage change value delta U of the direct-current contact network.
And the working condition judgment device is used for comparing the voltage change value delta U of the direct-current contact network with the preset condition of the control system and judging the working condition of the system.
And if the adjusting device accords with the preset system working condition and the direct-current voltage value reaches the set threshold value, the PWM energy feedback converter performs real-time adjustment according to the judgment result.
Wherein, the working condition judging device comprises:
and the system voltage fluctuation judging module is used for judging that the voltage fluctuation of the power supply network or the voltage fluctuation caused by the rectification of the diode rectifier causes the voltage fluctuation of the contact network if the voltage change value delta U is less than or equal to delta 1.
And the train traction starting judgment module is used for judging that the voltage fluctuation of the contact net is caused by the train traction starting if the voltage change value delta U is less than 0 and the absolute value delta 1 of the voltage change value is less than or equal to delta U and less than or equal to delta 2.
And the train braking judgment module is used for judging that the train braking causes the voltage fluctuation of the traction network if the voltage change value delta U is more than 0 and the absolute value delta 2 of the voltage change value is less than or equal to delta U and less than or equal to delta 3.
Wherein the adjusting device comprises:
and the no-load voltage comparison module is used for starting the PWM energy feedback converter and feeding back the energy of the direct current contact network to the alternating current power grid if the voltage change value delta U is greater than 0, the absolute value delta 2 of the voltage change value is less than delta U and less than or equal to delta 3, and the direct current voltage value is greater than the no-load voltage value of the direct current contact network.
And the converter voltage comparison module is used for starting the PWM energy feedback converter and feeding back the energy of the direct current contact net to the alternating current power grid if the voltage change value delta U is greater than 0, the absolute value delta 2 of the voltage change value is less than delta U and less than or equal to delta 3, and the direct current voltage value is greater than the preset voltage threshold value of the PWM energy feedback converter.
And the voltage change value comparison module is used for positively increasing the threshold value of the starting voltage and keeping the PWM energy-fed converter in a standby state if the voltage change value is 0 and less than or equal to delta U and less than or equal to delta 1, and reversely reducing the threshold value of the starting voltage and keeping the PWM energy-fed converter in the standby state if the voltage change value is less than or equal to delta U and less than or equal to 0.
The embodiment of the invention aims to protect a feedback control method and a feedback control system based on a PWM energy feedback converter, and the method and the system have the following effects:
the method accurately judges the running state of the train according to the change condition of the voltage of the direct-current contact network, avoids the error judgment of the PWM converter and the formation of power circulation with the diode rectifier unit, solves the problems of stability and reliability in the engineering application of the PWM converter, controls the accurate input of the PWM converter, achieves the aim of saving energy of a power supply system, and has simple and accurate judgment.
The computer program product of the feedback control method and device based on the PWM energy-fed converter provided by the embodiments of the present invention includes a computer readable storage medium storing a program code, and instructions included in the program code may be used to execute the method in the foregoing method embodiments.
Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, and the like, and when a computer program on the storage medium is run, the feedback control method based on the PWM energy feedback converter can be executed, so that the PWM rectifier can be controlled to be accurately put into use, and the purpose of saving energy of a power supply system is achieved.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A feedback control method based on a PWM energy feedback converter is characterized by comprising the following steps:
the direct current side of the PWM energy feedback converter is connected into a direct current contact network, and the alternating current side is connected into an alternating current power grid through a transformer;
detecting two direct current contact network voltages in a time sliding window;
calculating a voltage change value delta U of the direct-current contact network;
comparing the voltage change value delta U of the direct-current contact net with a preset condition of a control system, and judging the working condition of the system;
and if the direct current voltage value meets the preset system working condition and reaches the set threshold value, the PWM energy feedback converter carries out real-time adjustment according to the judgment result.
2. The feedback control method based on the PWM energy-fed converter according to claim 1, wherein the step of comparing the voltage variation value DeltaU of the direct-current contact network with a preset condition of a control system to judge the system working condition comprises the following steps:
if the voltage change value delta U is less than or equal to delta 1, judging that the voltage fluctuation of a power supply network or the voltage fluctuation caused by the rectification of a diode rectifier causes the voltage fluctuation of a contact network;
if the voltage change value delta U is less than 0 and the absolute value delta 1 of the voltage change value is less than or equal to delta U and less than or equal to delta 2, judging that the voltage fluctuation of the contact network is caused by the traction start of the train;
if the voltage change value delta U is larger than 0 and the absolute value delta 2 of the voltage change value is smaller than the absolute value delta U and smaller than or equal to delta 3, the voltage fluctuation of the traction network caused by train braking is judged.
3. The feedback control method of claim 2, wherein if the feedback control method meets the preset system condition and the dc voltage value reaches the set threshold, the PWM converter performs real-time adjustment according to the determination result, comprising:
if the voltage change value delta U is more than 0, the absolute value delta U of the voltage change value delta 2 is more than and less than or equal to delta 3, and the direct-current voltage value is greater than the no-load voltage value of the direct-current contact network, starting the PWM energy feedback converter, and feeding the energy of the direct-current contact network back to the alternating-current power grid;
if the voltage change value delta U is more than 0, the absolute value delta U of the voltage change value delta 2 is more than and less than or equal to delta 3, and the direct current voltage value is greater than the preset voltage threshold value of the PWM energy feedback converter, the PWM energy feedback converter is started, and the energy of the direct current contact net is fed back to the alternating current power grid;
if the voltage change value is more than 0 and less than or equal to delta U and less than or equal to delta 1, the threshold value of the starting voltage is increased in the positive direction, and the PWM energy can be fed to the converter to maintain a standby state;
if the voltage change value delta U is less than or equal to 0, the threshold value of the starting voltage is reversely reduced, and the PWM energy-fed converter maintains the standby state.
4. A feedback control system based on a PWM energy feedback converter is characterized by comprising:
the energy feedback converter access device is characterized in that a direct current side of the PWM energy feedback converter is accessed to a direct current contact network, and an alternating current side is accessed to an alternating current power grid through a transformer;
the voltage detection device is used for detecting the voltages of the two direct current contact networks in the time sliding window;
the voltage change calculating device is used for calculating a voltage change value delta U of the direct-current contact network;
the working condition judgment device is used for comparing the voltage change value delta U of the direct-current contact network with a preset condition of the control system and judging the working condition of the system;
and if the adjusting device accords with the preset system working condition and the direct-current voltage value reaches the set threshold value, the PWM energy feedback converter performs real-time adjustment according to the judgment result.
5. The feedback control system based on the PWM energy-fed converter according to claim 4, wherein the operating condition determining means comprises:
the system voltage fluctuation judging module is used for judging that the voltage fluctuation of a power supply network or the voltage fluctuation of a contact network is caused by the rectification of a diode rectifier if the voltage change value delta U is less than or equal to delta 1;
the train traction starting judgment module is used for judging that the voltage fluctuation of a contact net is caused by train traction starting if the voltage change value delta U is less than 0 and the absolute value delta 1 of the voltage change value is less than or equal to delta U and less than or equal to delta 2;
and the train braking judgment module is used for judging that the train braking causes the voltage fluctuation of the traction network if the voltage change value delta U is more than 0 and the absolute value delta 2 of the voltage change value is less than or equal to delta U and less than or equal to delta 3.
6. The feedback control system based on the PWM energy fed converter according to claim 5, wherein said adjusting means comprises:
the no-load voltage comparison module is used for starting the PWM energy feedback converter and feeding back the energy of the direct current contact network to the alternating current power grid if the voltage change value delta U is greater than 0, the absolute value delta 2 of the voltage change value is less than delta U and less than or equal to delta 3, and the direct current voltage value is greater than the no-load voltage value of the direct current contact network;
the converter voltage comparison module is used for starting the PWM energy feedback converter and feeding back the energy of a direct current contact net to an alternating current power grid if the voltage change value delta U is greater than 0, the absolute value delta 2 of the voltage change value is less than delta U and less than or equal to delta 3, and the direct current voltage value is greater than the preset voltage threshold value of the PWM energy feedback converter;
and the voltage change value comparison module is used for positively increasing the threshold value of the starting voltage and keeping the PWM energy-fed converter in a standby state if the voltage change value is 0 and less than or equal to delta U and less than or equal to delta 1, and reversely reducing the threshold value of the starting voltage and keeping the PWM energy-fed converter in the standby state if the voltage change value is less than or equal to delta U and less than or equal to 0.
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| CN113422397A (en) * | 2021-06-22 | 2021-09-21 | 思源清能电气电子有限公司 | Automatic control method for energy feedback and rectification of flexible traction power supply device |
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| CN113422397A (en) * | 2021-06-22 | 2021-09-21 | 思源清能电气电子有限公司 | Automatic control method for energy feedback and rectification of flexible traction power supply device |
| CN113422397B (en) * | 2021-06-22 | 2023-01-20 | 思源清能电气电子有限公司 | Automatic control method for energy feedback and rectification of flexible traction power supply device |
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