CN114161999A - Control method of bidirectional converter device with subway traction network ice melting function - Google Patents
Control method of bidirectional converter device with subway traction network ice melting function Download PDFInfo
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- CN114161999A CN114161999A CN202111369723.5A CN202111369723A CN114161999A CN 114161999 A CN114161999 A CN 114161999A CN 202111369723 A CN202111369723 A CN 202111369723A CN 114161999 A CN114161999 A CN 114161999A
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- traction network
- bidirectional converter
- ice
- ice melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, wherein a plurality of traction stations are arranged at intervals along a subway traction network, and a bidirectional converter device is arranged in each traction station; the ice melting method comprises the following steps: the method comprises the steps of firstly determining two-way converter devices at two ends of an ice-covering section of a traction network, then improving the voltage input to the direct-current traction network by one of the two-way converter devices, and simultaneously setting the other two-way converter device into an inversion mode, so that current is generated in the ice-covering section of the traction network between the two-way converter devices, and ice melting is realized by using heat generated when the current flows through the two-way converter devices. According to the ice melting method for the bidirectional converter device, the voltage input to the direct current traction network by one bidirectional converter device is increased, the other bidirectional converter device is set to be in an inversion mode, ice melting is achieved by using heat generated when current flows through the equivalent resistance of the ice covering section of the traction network, extra investment is not needed to be increased, and operation cost is saved.
Description
Technical Field
The invention relates to a method for deicing a subway traction network, in particular to a method for controlling a bidirectional converter device with a subway traction network deicing function.
Background
Due to the combined action of air temperature, rain and snow and air humidity in winter, the subway traction net can have the ice coating phenomenon. Once the subway traction network is covered with ice, the normal flow taking of the train is influenced, even the traction network is damaged or broken, and the safe punctual operation of the train is seriously influenced, so that the ice melting operation of the covered subway traction network is required.
At present, the existing ice melting schemes all need to add additional ice melting equipment for melting ice, which not only increases additional operation cost, but also has poor operability in the ice melting process, and increases the complexity of the system.
The invention can directly utilize the running bidirectional converter device in the subway traction power supply system to realize the ice melting function, does not need to increase extra investment and saves the running cost. The ice melting process can be operated by one key through the background energy management system, the ice melting of the traction network can be completed by reasonably setting the parameters of the bidirectional converter device, the bidirectional converter device knife switch or the traction network knife switch does not need to be switched, and the ice melting system is simple to operate and convenient to implement.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a control method of a bidirectional converter device with a subway traction network ice melting function.
The invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, wherein a plurality of traction stations are arranged at intervals along a subway traction network, and a bidirectional converter device for realizing bidirectional transmission of electric energy between a direct current traction network and an alternating current power grid is arranged in each traction station; the method is characterized in that the method for melting ice of the subway traction network comprises the following steps: the method comprises the steps of firstly determining two-way converter devices at two ends of an icing section of a traction network, then increasing the voltage input to a direct-current traction network by one of the two-way converter devices after rectification of an alternating-current power grid, and simultaneously setting the other two-way converter device into an inversion mode in which electric energy is input to the alternating-current power grid by the direct-current traction network, so that current is generated in the icing section of the traction network between the two-way converter devices, and ice melting is realized by using heat generated by equivalent resistance of the icing section of the traction network when the current flows through.
The invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, which is realized by the following steps:
step 1): determining two bidirectional converter devices participating in ice melting, and selecting the two bidirectional converter devices at two ends of an ice-covered section of a traction network for ice melting according to the position of the ice-covered section of the traction network;
step 2): judging the working mode, and then judging whether the two bidirectional converter devices participating in ice melting selected in the step 1) are in operation, if so, judging whether the two bidirectional converter devices are in the PWM rectification working mode; if the two bidirectional converters are operated and in the PWM rectification working mode, executing the step 3); if one or two bidirectional converter devices do not operate or do not operate in the PWM rectification working mode, judging again after waiting for a period of time;
step 3): the rectification target voltage value is increased, the PWM rectification target voltage value of one of the two bidirectional converter devices is increased, namely, the voltage input to the direct current traction network by the bidirectional converter device from the alternating current network through PWM rectification is increased, and the voltage on the direct current traction network is lifted;
step 4): changing the working mode of the other converter, and converting the PWM rectification working mode of the other bidirectional converter device into an inversion working mode while executing the step 3), so that the ice coating section of the traction network generates current through the two bidirectional converter devices, and the ice melting is realized by utilizing the heat generated by the equivalent resistance of the ice coating section of the traction network when the current flows; meanwhile, the circulation generated in other sections of the traction network is avoided, and the normal and safe operation of the subway in other direct current traction network sections is not influenced.
The invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, which comprises the following steps of:
step a): closing the ice melting function parameters of the started two bidirectional converter devices to enable the ice melting function parameters to be recovered to a PWM rectification working mode state;
step b): and restoring the bidirectional converter device with the improved rectification target voltage value to an initial value so that the ice melting current is not generated at the ice coating section of the traction network after the ice melting is finished.
The invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, which comprises an energy management system for monitoring and controlling the working state of the bidirectional converter device in each traction station, wherein the energy management system comprises an operator station, a core switch and a sub switch, and the operator station is communicated with the bidirectional converter device through the core switch and the sub switch so as to monitor and control the working state of the bidirectional converter device.
According to the control method of the bidirectional converter device with the subway traction network ice melting function, the bidirectional converter device can provide electric energy for the subway direct current traction network, and can also feed back the electric energy generated by train braking to the alternating current power grid, so that bidirectional transmission of the electric energy between the alternating current power grid and the direct current traction network is realized.
The invention has the beneficial effects that: the invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, which comprises the steps of firstly selecting two bidirectional converter devices on two sides of an ice coating section of a traction network to participate in ice melting, then increasing the voltage input to a direct-current traction network by one of the bidirectional converter devices, and simultaneously setting the other bidirectional converter device into an inversion mode so as to enable the ice coating section of the traction network between the two bidirectional converter devices to generate current.
Drawings
FIG. 1 is a schematic diagram of a control method of a bidirectional converter device with a subway traction network ice melting function according to the present invention;
FIG. 2 is an equivalent circuit diagram of the control method of the bidirectional converter device with the subway traction network ice melting function of the invention;
FIG. 3 is a communication schematic diagram of a bidirectional converter device and an energy management system with a subway traction network ice melting function according to the present invention;
fig. 4 is a system topology diagram of the bidirectional converter device with the subway traction network ice melting function of the invention.
Fig. 5 is a circuit diagram of a bidirectional converter device according to the present invention.
In the figure: the system comprises a direct current traction network 1, an alternating current power grid 2, a traction station 3, a bidirectional converter device 4, an equivalent resistor 5, an operator station 6, a core switch 7, a sub-switch 8, a bidirectional converter 9, an inversion unit 10 and an ice coating section of the traction network 11.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a schematic diagram of a method for controlling a bidirectional converter device with a subway traction network ice melting function is provided, the bidirectional converter device 4 is arranged along the subway traction network, the bidirectional converter device 4 can provide electric energy for the subway direct current traction network 1, and can also feed back the electric energy generated by train braking to an alternating current power grid 2, so that bidirectional transmission of the electric energy between the alternating current power grid and the direct current traction network is realized. When the subway runs, the bidirectional converter device 4 works in a PWM (pulse-width modulation) rectification working mode, rectifies alternating current in the alternating current power grid 2 into required direct current, and inputs the direct current into the direct current traction grid 1 so as to supply the subway to get electricity from the direct current traction grid 1 for running.
The invention discloses a control method of a bidirectional converter device with a subway traction network ice melting function, which comprises the following steps: firstly, two-way converter devices 4 at two ends of an ice-covered section 11 of a traction network are determined, then the voltage input to a direct-current traction network 1 from an alternating-current power grid 2 after rectification of one of the two-way converter devices 4 is increased, and meanwhile, the other two-way converter device 4 is set to be in an inversion mode in which electric energy is input to the alternating-current power grid 2 from the direct-current traction network 1, so that current is generated in the ice-covered section 11 of the traction network between the two-way converter devices 4, and ice melting is realized by utilizing the heat generated by an equivalent resistor 5 of the ice-covered section of the traction network when the current flows.
As shown in fig. 2, an equivalent circuit diagram of the control method of the bidirectional converter device with the subway traction network ice melting function is provided, and the equivalent resistances of two direct current lines of the traction network ice coating section 11 are RL1 and RL2 respectively, so that in the process of current flowing, the traction network ice coating section 11 can generate certain heat to generate heat, and ice melting is realized.
The specific method comprises the following steps:
step 1): determining two bidirectional converter devices participating in ice melting, and selecting the two bidirectional converter devices at two ends of an ice-covered section of a traction network for ice melting according to the position of the ice-covered section of the traction network;
step 2): judging the working mode, and then judging whether the two bidirectional converter devices participating in ice melting selected in the step 1) are in operation, if so, judging whether the two bidirectional converter devices are in the PWM rectification working mode; if the two bidirectional converters are operated and in the PWM rectification working mode, executing the step 3); if one or two bidirectional converter devices do not operate or do not operate in the PWM rectification working mode, judging again after waiting for a period of time;
step 3): the rectification target voltage value is increased, the PWM rectification target voltage value of one of the two bidirectional converter devices is increased, namely, the voltage input to the direct current traction network by the bidirectional converter device from the alternating current network through PWM rectification is increased, and the voltage on the direct current traction network is lifted;
step 4): changing the working mode of the other converter, and converting the PWM rectification working mode of the other bidirectional converter device into an inversion working mode while executing the step 3), so that the ice coating section of the traction network generates current through the two bidirectional converter devices, and the ice melting is realized by utilizing the heat generated by the equivalent resistance of the ice coating section of the traction network when the current flows; meanwhile, the circulation generated in other sections of the traction network is avoided, and the normal and safe operation of the subway in other direct current traction network sections is not influenced.
After the ice melting of the ice coating section of the traction net is finished, the following steps are executed:
step a): closing the ice melting function parameters of the started two bidirectional converter devices to enable the ice melting function parameters to be recovered to a PWM rectification working mode state;
step b): and restoring the bidirectional converter device with the improved rectification target voltage value to an initial value so that the ice melting current is not generated at the ice coating section of the traction network after the ice melting is finished.
As shown in fig. 3, a communication schematic diagram of the bidirectional converter device with the subway traction network ice melting function and the energy-saving system of the present invention is shown, the energy-saving system monitors and controls the working state of the bidirectional converter device 4 in each traction station 3, and comprises an operator station 6, a core switch 7 and a sub-switch 8, the operator station communicates with the bidirectional converter device through the core switch and the sub-switch to monitor and control the working state of the bidirectional converter device. Therefore, one-button remote operation can be realized through the background energy management system in the whole ice melting process, and ice melting of the traction network can be completed by reasonably setting parameters of the bidirectional converter device.
As shown in fig. 4, a system topology diagram of the bidirectional converter device with the subway traction network ice melting function is provided, the bidirectional converter device 4 adopts a three-level parallel structure and is composed of a plurality of inversion units 10, and the voltage borne by each main power device when the main power device is turned off is only half of the voltage at the direct current side, so that the safety margin of the power device is improved; the amplitude of each subharmonic of the three-level inverter is smaller than that of each subharmonic of the two-level inverter, and the three-level inverter has the advantages of small harmonic content and low system loss.
Therefore, the invention can directly utilize the running bidirectional converter device in the subway traction power supply system to realize the ice melting function, does not need to increase extra investment and saves the running cost. The ice melting process can be remotely operated through the background energy management system, the ice melting of the traction network can be completed by reasonably setting the parameters of the bidirectional converter device, the bidirectional converter device knife switch or the traction network knife switch does not need to be switched, and the ice melting system is simple to operate and convenient to implement.
Claims (5)
1. A control method of a bidirectional converter device with a subway traction network ice melting function is provided, wherein a plurality of traction stations (3) are arranged at intervals along a subway traction network, and bidirectional converter devices for realizing bidirectional transmission of electric energy between a direct current traction network (1) and an alternating current power grid (2) are arranged in the traction stations; the method is characterized in that the method for melting ice of the subway traction network comprises the following steps: the method comprises the steps of firstly determining two-way converter devices at two ends of an ice-covered section (11) of a traction network, then increasing the voltage input to a direct-current traction network by one of the two-way converter devices after rectification of an alternating-current power grid, and simultaneously setting the other two-way converter device into an inversion mode in which electric energy is input to the alternating-current power grid by the direct-current traction network, so that current is generated in the ice-covered section of the traction network between the two-way converter devices, and ice melting is realized by using heat generated by an equivalent resistor (5) of the ice-covered section of the traction network when the current flows.
2. The control method of the bidirectional converter device with the subway traction network ice melting function according to claim 1 is realized by the following steps:
step 1): determining two bidirectional converter devices participating in ice melting, and selecting the two bidirectional converter devices at two ends of an ice-covered section of a traction network for ice melting according to the position of the ice-covered section of the traction network;
step 2): judging the working mode, and then judging whether the two bidirectional converter devices participating in ice melting selected in the step 1) are in operation, if so, judging whether the two bidirectional converter devices are in the PWM rectification working mode; if the two bidirectional converters are operated and in the PWM rectification working mode, executing the step 3); if one or two bidirectional converter devices do not operate or do not operate in the PWM rectification working mode, judging again after waiting for a period of time;
step 3): the rectification target voltage value is increased, the PWM rectification target voltage value of one of the two bidirectional converter devices is increased, namely, the voltage input to the direct current traction network by the bidirectional converter device from the alternating current network through PWM rectification is increased, and the voltage on the direct current traction network is lifted;
step 4): changing the working mode of the other converter, and converting the PWM rectification working mode of the other bidirectional converter device into an inversion working mode while executing the step 3), so that the ice coating section of the traction network generates current through the two bidirectional converter devices, and the ice melting is realized by utilizing the heat generated by the equivalent resistance of the ice coating section of the traction network when the current flows; meanwhile, the circulation generated in other sections of the traction network is avoided, and the normal and safe operation of the subway in other direct current traction network sections is not influenced.
3. The control method of the bidirectional converter device with the subway traction network ice melting function as claimed in claim 2, wherein after ice melting of the ice coating section of the traction network is finished, the following steps are executed:
step a): closing the ice melting function parameters of the started two bidirectional converter devices to enable the ice melting function parameters to be recovered to a PWM rectification working mode state;
step b): and restoring the bidirectional converter device with the improved rectification target voltage value to an initial value so that the ice melting current is not generated at the ice coating section of the traction network after the ice melting is finished.
4. The control method of the bidirectional converter device with the subway traction network ice melting function according to claim 2, characterized in that: the energy management system comprises an energy management system for monitoring and controlling the working state of the bidirectional converter devices (4) in each traction station (3), wherein the energy management system comprises an operator station (6), a core switch (7) and a sub-switch (8), and the operator station is communicated with the bidirectional converter devices through the core switch and the sub-switch so as to monitor and control the working state of the bidirectional converter devices.
5. The control method of the bidirectional converter device with the subway traction network ice melting function according to claim 2, characterized in that: the bidirectional converter device (4) can provide electric energy for the subway direct-current traction network (1), and can also feed back electric energy generated by train braking to the alternating-current power grid (2), so that bidirectional transmission of the electric energy between the alternating-current power grid and the direct-current traction network is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111369723.5A CN114161999A (en) | 2021-11-18 | 2021-11-18 | Control method of bidirectional converter device with subway traction network ice melting function |
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| CN202111369723.5A CN114161999A (en) | 2021-11-18 | 2021-11-18 | Control method of bidirectional converter device with subway traction network ice melting function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114825237A (en) * | 2022-05-17 | 2022-07-29 | 深圳量云能源网络科技有限公司 | Contact net anti-icing and ice-melting control method and system based on rail transit system |
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| CN112260199A (en) * | 2020-09-28 | 2021-01-22 | 北京交通大学 | Online ice melting system and method for rail transit alternating current |
| CN112260198A (en) * | 2020-09-28 | 2021-01-22 | 北京交通大学 | Multifunctional rail transit direct-current online ice melting system and method |
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2021
- 2021-11-18 CN CN202111369723.5A patent/CN114161999A/en active Pending
Patent Citations (5)
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| CN107215246A (en) * | 2017-05-22 | 2017-09-29 | 北京千驷驭电气有限公司 | Contact net intelligence ice melting system |
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