CN112356740B - 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 PDF

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Publication number
CN112356740B
CN112356740B CN202011309318.XA CN202011309318A CN112356740B CN 112356740 B CN112356740 B CN 112356740B CN 202011309318 A CN202011309318 A CN 202011309318A CN 112356740 B CN112356740 B CN 112356740B
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slope
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CN112356740A (en
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孟向军
黄辉
李朋翔
郎学斌
郑月宾
梅桂芳
郜亚秋
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Xian XJ Power Electronics Technology Co Ltd
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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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a feedback control method and system based on a PWM energy feedback converter. The method comprises 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 the voltage of a direct-current contact net within continuous time t; calculating the voltage change slope k of the direct-current contact network; comparing the voltage change slope of the direct current contact network with a preset condition of a control system, and judging the working condition of the system; and if the preset system working condition is met and the voltage value reaches the set threshold value, the PWM energy feedback converter is put into use. The system comprises: the device comprises an energy feedback converter access device, a voltage detection device, a slope calculation device, a working condition judgment device and a feedback regulation device. The method can accurately judge the running state of the train according to the change condition of the voltage of the direct-current contact network, and solves the problems of stability and reliability in the engineering application of the PWM converter, so that the accurate input of the PWM rectifier is controlled, the purpose of saving energy of a power supply system is achieved, and the criterion is simple and accurate.

Description

Feedback control method and system based on PWM energy feedback converter
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 voltage of the direct-current contact net within the continuous time t through the direct-current bus voltage sliding window.
And calculating the voltage change slope k of the direct-current contact network.
And comparing the voltage change slope 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 preset system working condition is met and the voltage value reaches a set threshold value, switching the PWM energy-feedback converter.
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 slope of the voltage change of the dc link system with a preset condition of a control system, and determining the system operating condition includes:
and if the absolute value of the change slope | k | is less than or equal to δ 1, judging that the voltage fluctuation of the overhead line system is caused by the voltage fluctuation of the power supply network.
If the absolute value delta 1 of the change slope is less than | k | and less than or equal to delta 2, the voltage fluctuation of the contact net caused by the rectification of the diode rectifier is judged.
If the change slope rate k is less than 0 and the absolute value delta 2 of the change slope is less than | k | and less than or equal to delta 3, the voltage fluctuation of the contact network caused by the train traction starting is judged.
If the change slope k is larger than 0 and the absolute value delta 2 of the change slope is smaller than | k | 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 preset system condition is met and the voltage value reaches the set threshold, the applying the PWM energy-fed converter includes:
if the change slope k is larger than 0, the absolute value delta 2 of the change slope is smaller than | k | and is 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 network, the PWM energy feedback converter is started, and the energy of the direct-current contact network is fed back to the alternating-current power grid.
If the change slope k is larger than 0, the absolute value delta 2 of the change slope is larger than | k | and is less than or equal to delta 3, and the direct current voltage value is larger 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.
In a second aspect, an embodiment of the present invention further provides a feedback control system based on a PWM energy-fed converter, including:
and the energy feedback converter access device is used for accessing the DC side of the PWM energy feedback converter into a DC contact network, and the AC side is accessed into an AC power grid through a transformer.
And the voltage detection device is used for detecting the voltage of the direct-current contact network within the continuous time t.
And the slope calculating device is used for calculating the voltage change slope k of the direct-current contact network.
And the working condition judgment device is used for comparing the voltage change slope of the direct-current contact network with the preset condition of the control system and judging the working condition of the system.
And the feedback adjusting device is used for inputting the PWM energy feedback converter if the preset system working condition is met and the voltage value reaches a set threshold value.
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 power supply network voltage fluctuation judgment module is used for judging that the power supply network voltage fluctuation causes the voltage fluctuation of the contact network if the absolute value of the slope change rate | k | is less than or equal to δ 1.
And the diode rectifier rectification judgment module is used for judging that the voltage fluctuation is caused by the rectification of the diode rectifier if the absolute value delta 1 of the slope change rate is less than | k | < delta 2.
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 slope change rate k is less than 0 and the absolute value delta 2 of the slope change rate is less than | k | and less than or equal to delta 3.
And the train braking judgment module is used for judging that the train braking causes the voltage fluctuation of the traction network when the slope change rate k is greater than 0 and the absolute value delta 2 of the slope change rate is less than | k | 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 feedback adjusting device includes:
and the no-load voltage comparison module is used for starting the PWM energy feedback converter when the change slope k is greater than 0, the absolute value delta 2 of the change slope is greater than | k | and is 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, so that the energy of the direct-current contact network is fed back to the alternating-current power grid.
And the converter voltage comparison module is used for starting the PWM energy feedback converter when the change slope k is greater than 0, the absolute value delta 2 of the change slope is greater than | k | and is less than or equal to delta 3, and the direct current voltage value is greater than the preset threshold value of the PWM energy feedback converter, so that the energy of the direct current contact net is fed back to the alternating current power grid.
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.
Fig. 1 is a flowchart 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.
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 voltage of the direct-current contact net within the continuous time t through a direct-current bus voltage sliding window.
And calculating the voltage change slope k of the direct-current contact network.
And comparing the voltage change slope 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 preset system working condition is met and the voltage value reaches a set threshold value, switching the PWM energy-feedback converter.
Wherein, the comparison direct current contact net voltage change slope and control system's preset condition, judge the system operating mode, include:
and if the absolute value of the change slope | k | is less than or equal to δ 1, judging that the voltage fluctuation of the overhead line system is caused by the voltage fluctuation of the power supply network.
If the absolute value delta 1 of the change slope is less than | k | and less than or equal to delta 2, the voltage fluctuation of the contact net caused by the rectification of the diode rectifier is judged.
If the change slope rate k is less than 0 and the absolute value delta 2 of the change slope is less than | k | and less than or equal to delta 3, the voltage fluctuation of the contact network caused by the train traction starting is judged.
If the change slope k is larger than 0 and the absolute value delta 2 of the change slope is smaller than | k | 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 predetermined system operating mode, voltage value reaches the settlement threshold value simultaneously, then puts into PWM and can feed the converter, includes:
if the change slope k is larger than 0, the absolute value delta 2 of the change slope is smaller than | k | and is 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 network, the PWM energy feedback converter is started, and the energy of the direct-current contact network is fed back to the alternating-current power grid.
If the change slope k is larger than 0, the absolute value delta 2 of the change slope is larger than | k | and is less than or equal to delta 3, and the direct current voltage value is larger 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.
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:
and the energy feedback converter access device is used for accessing the DC side of the PWM energy feedback converter into a DC contact network, and the AC side is accessed into an AC power grid through a transformer.
And the voltage detection device is used for detecting the voltage of the direct-current contact network within the continuous time t.
And the slope calculating device is used for calculating the voltage change slope k of the direct-current contact network.
And the working condition judgment device is used for comparing the voltage change slope of the direct-current contact network with the preset condition of the control system and judging the working condition of the system.
And the feedback adjusting device is used for inputting the PWM energy feedback converter if the preset system working condition is met and the voltage value reaches the set threshold value.
Wherein, the working condition judging device comprises:
and the power supply network voltage fluctuation judgment module is used for judging that the power supply network voltage fluctuation causes the voltage fluctuation of the contact network if the absolute value of the slope change rate | k | is less than or equal to δ 1.
And the diode rectifier rectification judgment module is used for judging that the voltage fluctuation is caused by the rectification of the diode rectifier if the absolute value delta 1 of the slope change rate is less than | k | < delta 2.
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 slope change rate k is less than 0 and the absolute value delta 2 of the slope change rate is less than | k | and less than or equal to delta 3.
And the train braking judgment module is used for judging that the train brakes to cause the voltage fluctuation of the traction network when the slope change rate k is more than 0 and the absolute value delta 2 of the slope change rate is less than | k | and less than or equal to delta 3.
Wherein, feedback adjusting device includes:
and the no-load voltage comparison module is used for starting the PWM energy feedback converter when the change slope k is greater than 0, the absolute value delta 2 of the change slope is greater than | k | and is 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, so that the energy of the direct-current contact network is fed back to the alternating-current power grid.
And the converter voltage comparison module is used for starting the PWM energy feedback converter when the change slope k is greater than 0, the absolute value delta 2 of the change slope is greater than | k | and is less than or equal to delta 3, and the direct current voltage value is greater than the preset threshold value of the PWM energy feedback converter, so that the energy of the direct current contact net is fed back to the alternating current power grid.
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:
according to the invention, the running state of the train is accurately judged through the change condition of the voltage of the direct-current contact network, the power circulation formed by misjudgment of the PWM converter and the diode rectifier unit is avoided, and the problems of stability and reliability in the engineering application of the PWM converter are solved, so that the PWM rectifier is controlled to be accurately put into use, the purpose of saving energy of a power supply system is achieved, and the criterion is simple and accurate.
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: those skilled in the art can still make modifications or changes to the embodiments described in the foregoing embodiments, or make equivalent substitutions for some features, within the scope of the 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 (4)

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 the voltage of a direct-current contact net within continuous time t;
calculating the voltage change slope k of the direct-current contact network;
comparing the voltage change slope of the direct current contact network with a preset condition of a control system, and judging the working condition of the system;
if the preset system working condition is met and the voltage value reaches the set threshold value, the PWM energy feedback converter is put into use;
comparing the direct current contact net voltage change slope and the preset condition of the control system, and judging the system working condition, comprising:
if the absolute value of the change slope | k | is less than or equal to δ 1, judging that the voltage fluctuation of the contact network is caused by the voltage fluctuation of the power supply network;
if the absolute value delta 1 of the change slope is less than | k | and less than or equal to delta 2, judging that the voltage fluctuation of the contact net is caused by the rectification of the diode rectifier;
if the change slope k is less than 0 and the absolute value delta 2 of the change slope is less than | k | and less than or equal to delta 3, judging that the voltage fluctuation of the contact network is caused by the traction start of the train;
if the change slope k is larger than 0 and the absolute value delta 2 of the change slope is smaller than | k | and smaller than or equal to delta 3, the voltage fluctuation of the traction network caused by train braking is judged.
2. The feedback control method of claim 1, wherein if the predetermined system operating condition is met and the voltage value reaches the predetermined threshold, the PWM converter is applied, comprising:
if the change slope k is larger than 0, the absolute value delta 2 of the change slope is larger than | k | and is less 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 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 change slope k is larger than 0, the absolute value delta 2 of the change slope is larger than | k | and is less than or equal to delta 3, and the direct current voltage value is larger 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.
3. A feedback control system based on a PWM energy feedback converter is characterized by comprising:
the energy feedback converter access device is used for accessing the direct current side of the PWM energy feedback converter into a direct current contact network, and the alternating current side is accessed into an alternating current power grid through a transformer;
the voltage detection device is used for detecting the voltage of the direct-current contact network within the continuous time t;
the slope calculation device is used for calculating the voltage change slope k of the direct-current contact network;
the working condition judgment device is used for comparing the voltage change slope of the direct-current contact network with the preset condition of the control system and judging the working condition of the system;
the feedback adjusting device is used for inputting the PWM energy feedback converter if the preset system working condition is met and the voltage value reaches a set threshold value;
the working condition judging device comprises:
the power supply network voltage fluctuation judgment module is used for judging that the voltage fluctuation of the contact network is caused by the power supply network voltage fluctuation if the absolute value of the slope change rate | k | is less than or equal to δ 1;
the diode rectifier rectification judging module is used for judging that voltage fluctuation is caused by rectification of the diode rectifier if the absolute value of the slope change rate delta 1 is less than | k | < delta 2;
the train traction starting judging module is used for judging that the voltage fluctuation of a contact net is caused by train traction starting if the slope change rate k is less than 0 and the absolute value delta 2 of the slope change rate is less than | k | and less than or equal to delta 3;
and the train braking judgment module is used for judging that the train braking causes the voltage fluctuation of the traction network if the slope change rate k is greater than 0 and the absolute value delta 2 of the slope change rate is less than | k | and less than or equal to delta 3.
4. The feedback control system based on the PWM energy-fed current transformer according to claim 3, wherein the feedback 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 change slope k is greater than 0, the absolute value delta 2 of the change slope is greater than | k | < but is 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 when the change slope k is greater than 0, the absolute value delta 2 of the change slope is less than | k | and less than or equal to delta 3, and the direct current voltage value is greater than the preset threshold value of the PWM energy feedback converter.
CN202011309318.XA 2020-11-20 2020-11-20 Feedback control method and system based on PWM energy feedback converter Active CN112356740B (en)

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JP2000233669A (en) * 1999-02-18 2000-08-29 Meidensha Corp Power feeding system for dc feeder line
CN201774266U (en) * 2010-08-10 2011-03-23 北京国电富通科技发展有限责任公司 Energy-storage control system
CN103219885B (en) * 2012-01-20 2015-08-12 百富(澳门离岸商业服务)有限公司 DC to DC transducer
CN107264340B (en) * 2017-06-26 2019-05-24 厦门科华恒盛股份有限公司 A method of for selecting the control strategy of energy feedback system current transformer
CN107776438B (en) * 2017-09-20 2019-03-19 北京市轨道交通建设管理有限公司 The anti-loop process of urban track traffic traction power supply and system

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