CN112928930A - Railway ice melting device and multi-target control method thereof - Google Patents
Railway ice melting device and multi-target control method thereof Download PDFInfo
- Publication number
- CN112928930A CN112928930A CN202110134375.7A CN202110134375A CN112928930A CN 112928930 A CN112928930 A CN 112928930A CN 202110134375 A CN202110134375 A CN 202110134375A CN 112928930 A CN112928930 A CN 112928930A
- Authority
- CN
- China
- Prior art keywords
- power
- ice melting
- railway
- power unit
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002844 melting Methods 0.000 title claims abstract description 125
- 230000008018 melting Effects 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 81
- 238000004804 winding Methods 0.000 claims abstract description 17
- 238000009499 grossing Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 241000463584 Erebia vidleri Species 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H8/00—Removing undesirable matter from the permanent way of railways; Removing undesirable matter from tramway rails
- E01H8/02—Methods or apparatus for removing ice or snow from railway tracks, e.g. using snow-ploughs ; Devices for dislodging snow or ice which are carried or propelled by tramway vehicles ; Moving or removing ballast
- E01H8/08—Methods or apparatus for removing ice or snow from railway tracks, e.g. using snow-ploughs ; Devices for dislodging snow or ice which are carried or propelled by tramway vehicles ; Moving or removing ballast by application of heat, e.g. by means of heated clearing instruments, melting in situ; Clearing devices which melt the dislodged snow; Clearing exclusively by means of rays or streams or gas or stream, or by suction
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a railway ice melting device and a multi-target control method thereof, wherein the device comprises a multi-winding transformer, a multi-target drive control circuit, a filter circuit and an output transformer, the multi-target drive control circuit consists of a plurality of power units, an input winding of the multi-winding transformer is connected to the tail end of a contact net, the low-voltage output side of the multi-winding transformer supplies power to the plurality of power units, the output sides of the plurality of power units form a cascade inverter, and the output of the cascade inverter is connected to the output transformer after passing through the filter circuit. The method is applied to the railway ice melting device. The device is connected to an electrified railway system and a multi-target control method of the power unit is applied, so that the contact net is electrified and heated, the ice melting of the contact net is realized, the railway traction voltage is converted into 10kV power supply voltage to supply power to railway power, the heating in a station is realized by utilizing the self heating, and the device has the functional characteristics of contact net ice melting, power supply, heating in the station and the like.
Description
Technical Field
The invention relates to the technical field of power supply of railway power systems, in particular to a railway ice melting device with functions of contact network ice melting, power supply and heating in a station and a multi-target control method applying the device.
Background
The railway power system is composed of a railway traction power system and a railway power supply and distribution system, wherein the railway traction power system supplies power to the railway traction locomotive by using a contact network and is generally single-phase 27.5kV, and the railway power supply and distribution system supplies power to a railway through line and a self-closing line and is generally 10 kV. The voltage at the 27.5kV side is transmitted by a high-voltage 110kV or 220kV special line and is reduced to 27.5kV for use by a transformer, and the 10kV is supplied by a 10kV bus connected with a public power grid and a special line.
In Xinjiang, Tibet, inner Mongolia, Qinghai and other places in northwest of China, due to the fact that the earth is vast and rare, the natural environment is severe, and a railway power supply is not available in electricity in the exploration design and construction process. While a common railway power 10kV power supply requires two independent power supplies to supply power, so that power supply in the area is difficult.
When a 27.5/10kV transformer is used for deicing a railway traction and a railway electric double-network interconnected railway, the traditional method is influenced by the quality problem of voltage at a traction side, and the voltage quality problems of voltage harmonic, wide-range voltage fluctuation, unbalanced voltage three phases and the like exist in voltage at a 10kV side, so that the load working reliability of a railway electric power supply and distribution network is reduced, and even the load is burnt.
In addition, when power is supplied to the regions in the northwest, the public power grid power supply is difficult to obtain, and meanwhile, the natural conditions of the regions are severe, so that the heating in winter is difficult. When coal is conventionally used for heating, a large amount of carbon dioxide is generated and the utilization rate is low.
It can be seen that there are a number of problems with the prior art.
Disclosure of Invention
The invention mainly aims to provide a railway ice melting device with functions of contact net ice melting, electric power supply and heating in a station.
The invention also aims to provide a multi-target control method of the railway ice melting device with the functions of contact network ice melting, power supply and heating in the station.
In order to achieve the above-mentioned main objective, the present invention provides a railway ice melting device, which comprises a multi-winding transformer, a multi-target driving control circuit, a filter circuit and an output transformer, the multi-target drive control circuit consists of a plurality of power units, an input winding of the multi-winding transformer is connected to the tail end of a contact net, the low-voltage output side of the multi-winding transformer supplies power for the power units, the output sides of the power units form a cascade inverter, the output of the cascade inverter is connected to the output transformer after passing through the filter circuit, the multi-target drive control circuit is used for the railway ice melting device to enable a contact network to be electrified and heated, ice melting of the contact network is achieved, railway traction voltage is converted into power supply voltage to supply power to railway power, and heating in a station is achieved by means of heating of the railway ice melting device.
In a further scheme, the power unit comprises a rectifying module, a heating module, a flat wave loop and a single-phase inverter H bridge, wherein the rectifying module is connected with the heating module, the heating module is connected with the flat wave loop, and the flat wave loop is connected with the single-phase inverter H bridge.
In a further aspect, the rectifier module includes a rectifier bridge, the heating module includes a power switch Q5 and a power resistor R, the smoothing circuit includes a dc energy storage smoothing capacitor, one end of the power switch Q5 is connected to the dc side of the rectifier bridge after being connected in series with the power resistor R, and the other end of the power switch Q5 is connected in parallel with the dc energy storage smoothing capacitor and the single-phase inverter H bridge in sequence.
In a further aspect, the single-phase inverter H-bridge includes a first leg formed by a power switch Q1 and a power switch Q3, and a second leg formed by a power switch Q2 and a power switch Q4.
In order to achieve another object, the present invention provides a multi-target control method for a railway ice melting device, where the railway ice melting device is adopted, and the method includes: calculating the redundancy capability: calculating the redundancy capability of the power units, and determining the number of the power units entering the ice-melting heating mode according to the redundancy capability; positioning a power unit in an ice melting and heating mode: the ice melting device is allowed to position the power units in the ice melting and heating state under the current input voltage and output capacity, and the positioning can be completed until the number of the power units positioned in each phase is equal to R (n) through the position numbers of the power units positioned in the first wheel, the middle wheel and the last wheel; modal control is carried out on the power unit: the power unit carries out ice melting and heating state control in the positioning process, electric power supply state control is carried out on the power unit which is not positioned, and the power unit is switched between two states through the continuous change of the positioning mark of the power unit.
Further, the calculating the redundancy capability of the power unit specifically includes: if the railway ice melting device has 3n power units and each phase of the A/B/C has n power units, when the railway ice melting device is at the lowest input voltage Uin_minAnd the output reaches the rated capacity SNThe number of redundancy stages is 2, wherein n is usually an odd number, and the numbers are 1,2 and … … n in sequence;
when the input voltage is UinAnd the output power is rated capacity SNThe redundancy capability of the railway ice melting device is shown as the formula (1):
when the output power is the actual output capacity S, the redundancy capability of the railway ice melting device is shown as a formula (2):
when the input voltage is UinAnd when the output actual capacity is S, the redundancy capability of the railway ice melting device is shown as a formula (3):
R(n)＝int(R1(n)+R2(n))；R(n)≤0.5*n； (3)。
further, the power unit positioning is based on the position numbers of the first wheel, the middle wheel and the last wheel, and specifically comprises the following steps:
first wheel positioning: the power unit number of each phase positioned in turn is
Positioning a middle wheel: the power unit number of each phase positioned in turn is
Positioning the last wheel: the power unit number of each phase positioned in sequence is as follows:
and positioning the position numbers of the power units through the first wheel, the middle wheel and the last wheel until the number of the power units positioned in each phase is equal to R (n).
The further scheme is that the mode control of the power unit specifically comprises an ice-melting heating state control mode, a power supply state control mode and a two-state switching control mode.
Further, under the ice-melting and heating state control mode:
turning off power switches Q1 and Q2 of the power unit, and turning on power switches Q3 and Q4 of the power unit, so that the single-phase inverter H bridge of the power unit is in a node state; if the power switches Q3 and Q4 are damaged, the power switches Q3 and Q4 are turned off, and the power switches Q1 and Q2 are turned on;
applying a PWM signal to a power switch Q5 of a power cell with a duty cycle of
Wherein, TonThe conduction period of the power switch is T, and the switching period is T; the current can be obtained:
increasing the duty cycle signal will cause iRIncrease and result in a rectifier bridge input current i of the power cellZIncreasing and finally increasing the input current of the railway ice melting device;
each phase has maximum R (n) power units in the ice-melting and heating state mode, the whole railway ice-melting device has 3R (n) power units in the ice-melting and heating state mode, the input current of the railway ice-melting device can be greatly increased, the input current acts on the contact network impedance, the line is heated, and the ice-preventing control is realized;
the rectifier bridge, the single-phase contravariant H bridge, power switch Q5 and resistance R of power unit can produce the loss, through air or liquid cooling mode, exports the heat and carries out the interior heating of station.
Further, in the power supply state control mode:
the power switch Q5 of the power unit is in an off state, so that iR＝0；
And power switches Q1, Q2, Q3 and Q4 of the power unit are in a PWM signal control state, so that power supply state control is realized.
Further, in the two-state switching control mode:
if t is the current control time and t-1 is the last control time, the switching control step comprises:
A. positioning of the ice melting and heating state control power unit is completed;
B. starting the power unit, and carrying out ice melting and heating state control on the positioned power unit;
C. performing power supply state control on the power unit which is not positioned;
D. marking the power unit positioned at the previous moment as R (n) (t-1), marking the power unit positioned at the current moment as R (n) (t), when R (n) (t-1) is more than or equal to R (n) (t), removing R (n) (t-1) -R (n) (t) redundant power unit marks, sequentially adding 1 to the serial numbers of the R (n) (t) power units marked at the current moment, and if the serial number of the marked power unit after adding 1 is more than n, carrying to the power unit No. 1 to start adding 1 mark until the number of the marked power units reaches R (n) (t); when R (n) (t-1) < R (n) (t), marking the power units according to the condition that R (n) (t-1) ≧ R (n) (t), and when the number of the marked power units after adding 1 still can not reach R (n) (t), marking the number less than R (n) (t) by 2 and removing the units which are to be repeated with the marked power units after adding 1 until the number of the marked non-repeated power units reaches R (n) (t).
E. And entering the step B.
Therefore, by adopting the technical scheme, the ice melting device is connected to the electrified railway system and has the following advantages after the method is applied:
1. 27.5kV of the railway electric energy with bad quality is converted into stable 10kV or 35kV to supply power to a railway electric power supply and distribution system, such as railway electric power self-closing lines, run-through lines, station feeder lines and other buses, so that the problems of weak public power grid in northwest regions and lack of railway electric power high-voltage power supply are solved; meanwhile, in developed areas, the high land acquisition and removal cost of the railway electric high-voltage power supply in the process of leading in from an external public power grid is reduced, and land resources are greatly saved.
2. In the northwest alpine regions, heating measures are often required to be designed and supplied independently, and a large amount of energy resources are wasted. The energy consumption generated by the station is utilized for the second time, so that the heating power is supplied for the air heating in the station and the heating of the heating plate, the heat dissipation problem of the ice melting device is solved, and the heating problem in the station is also solved.
3. By controlling the power unit of the ice melting device, the input current of the ice melting device is increased, and the large current acts on the line impedance of the overhead line system to generate heat, so that the aims of preventing the line from icing and melting ice in a cold state are fulfilled.
4. The power unit carries out ice melting and heating state control in the process of positioning the mark, electric power supply state control is carried out on the power unit which is not positioned, the mark of the power unit is constantly changed, the unit is switched between two states, the switching of the two control states is automatically completed in the control process, and the control speed is high.
5. The ice melting, the heating in the station and the power supply need can be realized simultaneously, so that the purpose of reusing the functions of the ice melting device is achieved, and the quality improvement and the efficiency improvement are realized.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a railway ice melting apparatus of the present invention.
FIG. 2 is a schematic circuit diagram of a power unit in an embodiment of a railway ice melting apparatus of the present invention.
FIG. 3 is a block flow diagram of an embodiment of a multi-objective control method of a railway ice melting apparatus of the present invention.
FIG. 4 is a schematic circuit diagram of a power unit in an ice-melting heating state control mode in an embodiment of a multi-target control method for a railway ice-melting device according to the present invention.
FIG. 5 is a schematic circuit diagram of a power unit in a power supply state control mode in an embodiment of a multi-target control method for a railway ice melting apparatus of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
An embodiment of a railway ice melting device comprises:
referring to fig. 1, the railway ice melting apparatus 1 of the present invention includes a multi-winding transformer 10, a multi-target drive control circuit, a filter circuit, and an output transformer 30, the multi-target drive control circuit being composed of a plurality of power cells 20, such as power cell modules a1-a9, power cell modules B1-B9, and power cell modules C1-C9.
In this embodiment, the input winding of the multi-winding transformer 10 is connected to the end of the contact line, the low-voltage output side of the multi-winding transformer 10 supplies power to the input sides of the power cells 20, the output sides of the power cells 20 form a cascade inverter, and the output of the cascade inverter is connected to the output transformer 30 after passing through the filter circuit, wherein one output side of the power cell module a1 is connected to one output side of the power cell module B1 and the power cell module C1, the other output side of the power cell module a1 is connected to one output side of the next power cell module (e.g., the power cell module a2), the other output side of the penultimate power cell module (e.g., the power cell module A8) is connected to one output side of the last power cell module (e.g., the power cell module a9), and the last power cell module (e.g., the power cell module a9, the power cell module B, B9, C9) is connected to the output transformer 30 after passing through the filter circuit.
The multi-target drive control circuit in the embodiment is used for the railway ice melting device 1 to enable a contact network to be electrified and heated, so that ice melting of the contact network is realized, railway traction voltage is converted into power supply voltage to supply power to railway power, and heating in a station is realized by utilizing the heating of the railway ice melting device 1.
Specifically, the power unit 20 adopts a multi-target control method, so that the railway ice melting device 1 converts the railway traction voltage into 10kV or 35kV voltage to supply power to railway power, and meanwhile, the contact network ice melting and the in-station heating are realized.
Further, the installation site of the railway ice melting device 1 with the functions of deicing of the overhead contact line, power supply and heating in the station is located in a sub-district substation or an inter-district substation near the tail end of the overhead contact line.
As shown in fig. 2, the power unit 20 includes a rectifier module 21, a heater module 22, a smoothing circuit 23, and a single-phase inverter H-bridge 24, the rectifier module 21 is connected to the heater module 22, the heater module 22 is connected to the smoothing circuit 23, and the smoothing circuit 23 is connected to the single-phase inverter H-bridge 24.
In this embodiment, the rectifying module 21 includes a rectifying bridge, the heating module 22 includes a power switch Q5 and a power resistor R, the smoothing circuit 23 includes a dc energy storage smoothing capacitor, after the power switch Q5 is connected in series with the power resistor R, one end of the power switch Q5 is connected to the dc side of the rectifying bridge, and the other end of the power switch Q5 is connected in parallel with the dc energy storage smoothing capacitor and the single-phase inverter H bridge 24 in sequence.
The single-phase inverter H-bridge 24 includes a first arm formed by a power switch Q1 and a power switch Q3, and a second arm formed by a power switch Q2 and a power switch Q4. The power switch of the present embodiment is an IGBT.
Specifically, the power unit 20 of the railway ice melting device 1 with functions of contact line ice melting, power supply and heating in the station consists of a rectifier bridge, an IGBT, a power resistor, an energy storage flat wave capacitor and an inverter H bridge, wherein the IGBT and the power resistor are connected in series and then are connected to the direct current side of the rectifier bridge, and then the energy storage flat wave capacitor and the inverter H bridge are connected in parallel in sequence.
Further, the filter circuit comprises an inductor L, a capacitor C and a resistor RCAnd (3) forming the LCR filter.
Further, the heat dissipation mode of the power unit 20 is air cooling or liquid cooling heat dissipation, when air cooling is adopted, heated air is discharged into a transformer substation room through a closed air duct, and when liquid cooling is adopted, the heated cooling liquid is directly or indirectly connected with heating loop water to heat the heating radiator.
An embodiment of a multi-target control method of a railway ice melting device comprises the following steps:
a multi-target control method for a railway ice melting device is applied to the railway ice melting device 1, and referring to fig. 3, the multi-target control method comprises the following steps:
step S1, calculating redundancy capability: and calculating the redundancy capability of the power units 20, and determining the number of the power units 20 entering the ice-melting heating mode according to the redundancy capability.
Step S2, positioning the power unit 20 in the ice-melting and heating mode: the power units 20 in the ice melting heating state of the ice melting device are allowed to be positioned under the current input voltage and the current output capacity, and the positioning can be completed by positioning the position numbers of the power units 20 through the first wheel, the middle wheel and the last wheel until the number of the power units 20 positioned in each phase is equal to R (n).
Step S3, performing modal control on the power unit 20: the power unit 20 performs ice melting and heating state control in the positioning process, performs power supply state control on the power unit 20 which is not positioned, and realizes the switching of the power unit 20 between two states through the continuous change of the positioning mark of the power unit 20.
In step S1, the calculating the redundancy capability of the power unit 20 specifically includes: if the railway ice melting device 1 has 3n power units 20 and each phase of A/B/C has n power units 20, when the railway ice melting device 1 is at the lowest input voltage Uin_min(generally 19kV in engineering) and the output reaches the rated capacity SNThe number of redundancy levels is 2 (typically with 2 levels of redundancy), where n is typically an odd number, numbered 1,2, … … n in that order.
In the design index of the railway ice melting device 1 of the embodiment, the limit voltage fluctuation range of the tail end of a general catenary is 19-31.5kV, the actual fluctuation ranges are different under the influence of different types of locomotives, but the maximum limit of the fluctuation ranges is not more than the range of 19-31.5 kV.
In this embodiment, the purpose of computing the redundancy capabilities is to: the power unit 20 has two modes of operation: one is power supply; one is ice melting and heating. The redundancy capability means calculating how many power units 20 can enter the ice-melting heating mode.
When the input voltage is UinAnd the output power is rated capacity SNIn time, the redundancy capability of the railway ice melting device 1 is shown as formula (1):
when the output power is the actual output capacity S, the redundancy capability of the railway ice melting device 1 is as shown in formula (2):
when inputtingVoltage is UinAnd when the output actual capacity is S, the redundancy capability of the railway ice melting device 1 is as shown in formula (3):
R(n)＝int(R1(n)+R2(n))；R(n)≤0.5*n； (3)
wherein int (R) is an integer function, and when R is 3.1, R is 3. R is 3.7 and R is 3.
The method for positioning the power unit 20 allowing the ice melting device to perform the ice melting heating state under the current input voltage and output capacity specifically comprises the following steps:
1) first wheel positioning: the power cells 20 positioned in sequence for each phase are numbered
2) Positioning a middle wheel: the power cells 20 positioned in sequence for each phase are numbered
3) Positioning the last wheel: the power cells 20 positioned in sequence for each phase are numbered:
4) the position numbers of the power units 20 are positioned through the first wheel, the middle wheel and the last wheel until the number of the power units 20 positioned at each phase is equal to R (n).
It can be seen that the purpose of the positioning is to not bring the power cells 20 together in the ice-melt heating state, but rather to spread them out so that they do not overheat the local air or coolant. For example, if the units 1, 5 and 9 are positioned, the heat will be dispersed and not concentrated, thereby avoiding the problem of local overheating.
Further, the mode control of the power unit 20 specifically includes an ice-melting heating state control mode, a power supply state control mode, and a two-state switching control mode.
Referring to fig. 4, in the ice-melting and heating state control mode:
A. turning off the power switches Q1 and Q2 of the power unit 20 to turn on the power switches Q3 and Q4 of the power unit 20, so that the single-phase inverter H-bridge 24 of the power unit 20 is in a node state; if the power switches Q3 and Q4 are damaged, the power switches Q3 and Q4 are turned off, and the power switches Q1 and Q2 are turned on;
B. a PWM signal is applied to a power switch Q5 of the power unit 20 with a duty cycle of
Wherein, TonThe conduction period of the power switch is T, and the switching period is T; the current can be obtained:
increasing the duty cycle signal will cause iRIncrease and result in a rectifier bridge input current i of the power unit 20ZIncreasing and finally increasing the input current of the railway ice melting device 1;
C. each phase has maximum r (n) power units 20 in the ice-melting and heating state mode, and the whole railway ice-melting device 1 has 3 × r (n) power units 20 in the ice-melting and heating state mode, so that the input current of the railway ice-melting device 1 can be greatly increased, and acts on the contact network impedance, so that the line is heated, and the anti-icing control is realized;
D. the rectifier bridge, the single-phase inverter H-bridge 24, the power switch Q5 and the resistor R of the power unit 20 generate loss, and heat is conducted out to perform heating in the station through an air or liquid cooling mode.
Referring to fig. 4, in the power-on state control mode:
the power switch Q5 of the power unit 20 is in an off state, iR＝0；
The power switches Q1, Q2, Q3 and Q4 of the power unit 20 are in the PWM signal control state, and power supply state control is realized.
In summary, in the toggle control mode:
if t is the current control time and t-1 is the last control time, the switching control step comprises:
A. positioning of the ice melting and heating state control power unit 20 is completed;
B. starting the power unit 20, and performing ice melting and heating state control on the positioned power unit 20;
C. performing power supply state control on the power unit 20 that is not located;
D. the power unit 20 positioned at the previous moment is marked as R (n) (t-1), the power unit 20 positioned at the current moment is marked as R (n) (t), when R (n) (t-1) is not less than R (n) (t), R (n) (t-1) -R (n) (t) are removed, the serial numbers of the R (n) (t) power units 20 marked at the current moment are sequentially added with 1, if the serial number of the power unit 20 marked after adding 1 is more than n, the power unit 20 marked up to No. 1 is carried forward to add 1 mark until the number of the marked power units 20 reaches R (n) (t); when R (n) (t-1) < R (n) (t), marking the power units 20 according to the condition that R (n) (t-1) ≧ R (n) (t), and when the number of the marked power units 20 after adding 1 still can not reach R (n) (t), marking the number less than R (n) (t) by 2 and removing the units which are to be repeated with the marked power units after adding 1 until the number of the marked non-repeated power units 20 reaches R (n) (t).
E. And entering the step B.
Therefore, by adopting the technical scheme, the ice melting device is connected to the electrified railway system and has the following advantages after the method is applied:
1. 27.5kV of the railway electric energy with bad quality is converted into stable 10kV or 35kV to supply power to a railway electric power supply and distribution system, such as railway electric power self-closing lines, run-through lines, station feeder lines and other buses, so that the problems of weak public power grid in northwest regions and lack of railway electric power high-voltage power supply are solved; meanwhile, in developed areas, the high land acquisition and removal cost of the railway electric high-voltage power supply in the process of leading in from an external public power grid is reduced, and land resources are greatly saved.
2. In the northwest alpine regions, heating measures are often required to be designed and supplied independently, and a large amount of energy resources are wasted. The energy consumption generated by the station is utilized for the second time, so that the heating power is supplied for the air heating in the station and the heating of the heating plate, the heat dissipation problem of the ice melting device is solved, and the heating problem in the station is also solved.
3. By controlling the power unit 20 of the ice melting device, the input current of the ice melting device is increased, and the large current acts on the line impedance of the overhead line system to generate heat, so that the aims of preventing the line from icing and melting ice in a cold state are fulfilled.
4. The power unit 20 performs ice melting and heating state control in the marking positioning process, performs electric power supply state control on the power unit 20 which is not positioned, realizes the switching of the unit between the two states by the continuous change of the marking of the power unit 20, automatically completes the switching of the two control states in the control process, and has high control speed.
5. The ice melting, the heating in the station and the power supply need can be realized simultaneously, so that the purpose of reusing the functions of the ice melting device is achieved, and the quality improvement and the efficiency improvement are realized.
It should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. Although the invention has been described herein with reference to a number of illustrative examples thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, other uses will be apparent to those skilled in the art in view of variations and modifications in the subject matter incorporating the components and/or arrangement of the arrangement within the scope of the disclosure, drawings and claims hereof.
Claims (11)
1. A railway ice melting device is applied to an electrified railway system and is characterized by comprising:
the multi-winding transformer comprises a multi-winding transformer, a multi-target drive control circuit, a filter circuit and an output transformer, wherein the multi-target drive control circuit is composed of a plurality of power units, an input winding of the multi-winding transformer is connected to the tail end of a contact net, the low-voltage output side of the multi-winding transformer supplies power to the plurality of power units, the output sides of the plurality of power units form a cascade inverter, the output of the cascade inverter is connected to the output transformer after passing through the filter circuit, wherein the multi-target drive control circuit is used for a railway ice melting device to enable the contact net to be electrified and heated, so that ice melting of the contact net is realized, railway traction voltage is converted into power supply voltage to supply power for railway electric power, and heating in a station is.
2. The railway ice melting apparatus of claim 1, wherein:
the power unit comprises a rectifying module, a heating module, a flat wave loop and a single-phase inversion H bridge, the rectifying module is connected with the heating module, the heating module is connected with the flat wave loop, and the flat wave loop is connected with the single-phase inversion H bridge.
3. The railway ice melting apparatus of claim 2, wherein:
the rectifier module comprises a rectifier bridge, the heating module comprises a power switch Q5 and a power resistor R, the smoothing loop comprises a direct-current energy storage smoothing capacitor, one end of the power switch Q5 is connected with the power resistor R in series and then connected to the direct-current side of the rectifier bridge, and the other end of the power switch Q5 is connected with the direct-current energy storage smoothing capacitor and the single-phase inverter H bridge in parallel in sequence.
4. A railway ice melting apparatus according to claim 3, wherein:
the single-phase inverter H-bridge comprises a first bridge arm formed by a power switch Q1 and a power switch Q3, and a second bridge arm formed by a power switch Q2 and a power switch Q4.
5. A method for multi-objective control of a railway ice melting device, wherein the railway ice melting device is a railway ice melting device as claimed in any one of claims 1 to 4, the method comprising:
calculating the redundancy capability: calculating the redundancy capability of the power units, and determining the number of the power units entering the ice-melting heating mode according to the redundancy capability;
positioning a power unit in an ice melting and heating mode: the power units of the ice melting device in the ice melting heating state are allowed to be positioned under the current input voltage and the current output capacity, and the position numbers of the power units are positioned through the first wheel, the middle wheel and the last wheel until the number of the power units positioned in each phase is equal to R(n)So far, the positioning can be finished;
modal control is carried out on the power unit: the power unit carries out ice melting and heating state control in the positioning process, electric power supply state control is carried out on the power unit which is not positioned, and the power unit is switched between two states through the continuous change of the positioning mark of the power unit.
6. The method of claim 5, wherein:
the calculating the redundancy capability of the power unit specifically includes:
if the railway ice melting device has 3n power units and each phase of the A/B/C has n power units, when the railway ice melting device is at the lowest input voltage Uin_minAnd the output reaches the rated capacity SNThe number of redundancy stages is 2, wherein n is usually an odd number, and the numbers are 1,2 and … … n in sequence;
when the input voltage is UinAnd the output power is rated capacity SNThe redundancy capability of the railway ice melting device is shown as the formula (1):
when the output power is the actual output capacity S, the redundancy capability of the railway ice melting device is shown as a formula (2):
when the input voltage is UinAnd when the output actual capacity is S, the redundancy capability of the railway ice melting device is shown as a formula (3):
R(n)＝int(R1(n)+R2(n))；R(n)≤0.5*n； (3)。
7. the method of claim 5, wherein:
the power unit location is through the position number of leading wheel, well wheel, last wheel location power unit, specifically includes:
first wheel positioning: the power unit number of each phase positioned in turn is
Positioning a middle wheel: the power unit number of each phase positioned in turn is
Positioning the last wheel: the power unit number of each phase positioned in sequence is as follows:
the position numbers of the power units are positioned through a first wheel, a middle wheel and a last wheel until the number of the power units positioned at each phase is equal to R(n)Until now.
8. The method of claim 5, wherein:
the mode control of the power unit specifically comprises an ice melting and heating state control mode, a power supply state control mode and a two-state switching control mode.
9. The method of claim 8, wherein:
under the ice-melting heating state control mode:
turning off power switches Q1 and Q2 of the power unit, and turning on power switches Q3 and Q4 of the power unit, so that the single-phase inverter H bridge of the power unit is in a node state; if the power switches Q3 and Q4 are damaged, the power switches Q3 and Q4 are turned off, and the power switches Q1 and Q2 are turned on;
applying a PWM signal to a power switch Q5 of a power cell with a duty cycle of
Wherein, TonThe conduction period of the power switch is T, and the switching period is T; the current can be obtained:
increasing the duty cycle signal will cause iRIncrease and result in a rectifier bridge input current i of the power cellZIncreasing and finally increasing the input current of the railway ice melting device;
maximum R (n) power units of each phase are in the ice melting and heating state mode, and the whole railway ice melting device has 3R(n)The power units are in an ice melting and heating state mode, so that the input current of the railway ice melting device can be greatly increased, the input current acts on the contact network impedance, the line is heated, and ice melting control is realized;
the rectifier bridge, the single-phase contravariant H bridge, power switch Q5 and resistance R of power unit can produce the loss, through air or liquid cooling mode, exports the heat and carries out the interior heating of station.
10. The method of claim 8, wherein:
in the power-on state control mode:
the power switch Q5 of the power unit is in an off state, so that iR＝0；
And power switches Q1, Q2, Q3 and Q4 of the power unit are in a PWM signal control state, so that power supply state control is realized.
11. The method of claim 8, wherein:
in the two-state switching control mode:
if t is the current control time and t-1 is the last control time, the switching control step comprises:
A. positioning of the ice melting and heating state control power unit is completed;
B. starting the power unit, and carrying out ice melting and heating state control on the positioned power unit;
C. performing power supply state control on the power unit which is not positioned;
D. the power unit positioned at the last moment is marked as R(n)(t-1)The power unit positioned at the current moment is R(n)(t)When R is(n)(t-1)≥R(n)(t)When R is removed(n)(t-1)-R(n)(t)A redundant power cell flag, R for the current flag(n)(t)Sequentially adding 1 to the serial number of each power unit, if the serial number of the power unit marked after adding 1 is greater than n, carrying to the power unit No. 1 and starting to add 1 to the power unit No. 1 until the number of the marked power units reaches R(n)(t)A plurality of; when R is(n)(t-1)<R(n)(t)According to R(n)(t-1)≥R(n)(t)The power cells are marked, and the number of the marked power cells still can not reach R after the serial number is added by 1(n)(t)When it is not enough to R(n)(t)The number of the marked non-repeated power units is marked by adding 2 and the units which are marked to repeat after adding 1 are removed until the number of the marked non-repeated power units reaches R(n)(t)And (4) stopping.
E. And entering the step B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134375.7A CN112928930B (en) | 2021-01-29 | 2021-01-29 | Railway ice melting device and multi-target control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134375.7A CN112928930B (en) | 2021-01-29 | 2021-01-29 | Railway ice melting device and multi-target control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112928930A true CN112928930A (en) | 2021-06-08 |
| CN112928930B CN112928930B (en) | 2022-03-25 |
Family
ID=76169102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110134375.7A Active CN112928930B (en) | 2021-01-29 | 2021-01-29 | Railway ice melting device and multi-target control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112928930B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623941A (en) * | 2012-04-02 | 2012-08-01 | 郴州市东塘电气设备有限公司 | Direct current deicing device for 10KV rural power grid distribution line |
| CN102642481A (en) * | 2011-02-18 | 2012-08-22 | 株洲变流技术国家工程研究中心有限公司 | Electricity energy regulating-ice melting device and method for railway traction network |
| CN103490645A (en) * | 2013-09-23 | 2014-01-01 | 株洲变流技术国家工程研究中心有限公司 | Single-phase electrified railway contact net direct-current deicing device and system |
| CN204244102U (en) * | 2014-11-24 | 2015-04-01 | 国家电网公司 | A kind of electric power transmission line 10KV power cable deicing device |
| DE102014217300A1 (en) * | 2014-08-29 | 2016-03-03 | Siemens Aktiengesellschaft | Arrangement for connecting a traction power supply for a railway line to a three-phase supply network |
| CN106240405A (en) * | 2016-08-25 | 2016-12-21 | 广州智光电气股份有限公司 | Single phase power supply device, electric railway traction power supply system and control method thereof |
-
2021
- 2021-01-29 CN CN202110134375.7A patent/CN112928930B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102642481A (en) * | 2011-02-18 | 2012-08-22 | 株洲变流技术国家工程研究中心有限公司 | Electricity energy regulating-ice melting device and method for railway traction network |
| CN102623941A (en) * | 2012-04-02 | 2012-08-01 | 郴州市东塘电气设备有限公司 | Direct current deicing device for 10KV rural power grid distribution line |
| CN103490645A (en) * | 2013-09-23 | 2014-01-01 | 株洲变流技术国家工程研究中心有限公司 | Single-phase electrified railway contact net direct-current deicing device and system |
| DE102014217300A1 (en) * | 2014-08-29 | 2016-03-03 | Siemens Aktiengesellschaft | Arrangement for connecting a traction power supply for a railway line to a three-phase supply network |
| CN204244102U (en) * | 2014-11-24 | 2015-04-01 | 国家电网公司 | A kind of electric power transmission line 10KV power cable deicing device |
| CN106240405A (en) * | 2016-08-25 | 2016-12-21 | 广州智光电气股份有限公司 | Single phase power supply device, electric railway traction power supply system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112928930B (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104702114A (en) | High-frequency-chain bidirectional direct-current transformer with switched capacitor access and control method thereof | |
| CN102642481B (en) | Electricity energy regulating-ice melting device and method for railway traction network | |
| CN102496898A (en) | Bifunctional direct current ice melting apparatus based on voltage source type current converter and ice melting method thereof | |
| CN107215246A (en) | Contact net intelligence ice melting system | |
| CN101071163B (en) | Current converter test circuit | |
| CN101071162A (en) | Current converter test circuit | |
| CN109546679A (en) | Straightening stream collects system and the bipolar short trouble traversing method of medium voltage side in photovoltaic | |
| CN103475032B (en) | A kind of intelligent adapted electricity flexible control system | |
| CN112260199A (en) | Online ice melting system and method for rail transit alternating current | |
| Hou et al. | A novel DC traction power supply system based on the modular multilevel converter suitable for energy feeding and de-icing | |
| CN112928930B (en) | Railway ice melting device and multi-target control method thereof | |
| CN206195310U (en) | High voltage alternating current transmission lines conductor ice prevention device and combination thereof | |
| CN207010555U (en) | The unit cascaded type high-power high-frequency high-voltage ice-melt excitation power supply circuit of full-controlled device | |
| CN111478616A (en) | Subway traction power supply system and bidirectional converter device | |
| CN110932215A (en) | System and method for deicing overhead line by using photovoltaic power generation | |
| CN206820672U (en) | A kind of city rail vehicle power inverter for air conditioner | |
| CN213879226U (en) | Rail transit alternating-current online ice melting system | |
| CN113161967B (en) | Phase-shifting online ice melting method based on flexible interconnected transformer substation | |
| CN202282595U (en) | High-voltage direct-current ice melting device with a source filter function | |
| CN105553275B (en) | Six phase contravariant high power DC booster converters of one kind and its control method | |
| CN204906217U (en) | Gto photovoltaic inverter | |
| CN211830132U (en) | Line icing eliminating device for pumped storage station | |
| CN101071975A (en) | Dual three-level phase-shift high-voltage high-power frequency transformer | |
| CN107215245A (en) | The contact net ice melting system of energy self-loopa | |
| CN107395028A (en) | The unit cascaded type high-power high-frequency high-voltage ice-melt excitation power supply circuit of full-controlled device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |