CN114937968B - Direct-current ice melting device for electrified railway contact network and control method thereof - Google Patents
Direct-current ice melting device for electrified railway contact network and control method thereof Download PDFInfo
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- CN114937968B CN114937968B CN202210547239.5A CN202210547239A CN114937968B CN 114937968 B CN114937968 B CN 114937968B CN 202210547239 A CN202210547239 A CN 202210547239A CN 114937968 B CN114937968 B CN 114937968B
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- 238000002844 melting Methods 0.000 title claims abstract description 68
- 230000008018 melting Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004146 energy storage Methods 0.000 claims abstract description 19
- 230000001172 regenerating effect Effects 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000003137 locomotive effect Effects 0.000 abstract description 7
- 238000002955 isolation Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 230000002265 prevention Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a direct-current deicing device for an electrified railway overhead line system and a control method thereof. A left converter and a right converter of the direct current ice melting device are connected back to back and are respectively connected to a secondary bus of a traction transformer through an isolation type step-down transformer. The middle direct current sides of the two converters are connected through a breaker. When the device works in a direct-current anti-icing and ice-melting mode, the direct-current ports on the left side and the right side of the device are connected in series through the circuit breakers, and then the anode and the cathode after being connected in series are respectively connected to an alpha uplink contact net and a beta downlink contact net, so that the high-capacity direct-current anti-icing and ice-melting requirements of the contact nets can be met. When the device works in a regenerated energy utilization mode, the direct current ports on the left side and the right side of the device are connected in parallel through the circuit breakers, and the connecting lines are led out to provide grid-connected interfaces for the energy storage and new energy systems, so that the regenerated braking energy of the locomotive can be effectively utilized, and the energy efficiency, the electric energy quality and the reliability of the power supply system of the electrified railway are improved.
Description
Technical Field
The invention relates to the field of traction power supply systems of electrified railways, in particular to a direct-current deicing device for an overhead contact system of an electrified railway and a control method thereof.
Background
At present, in a traction power supply system of an electrified railway, an electric locomotive/motor train unit obtains power from a contact net to supply power to the electric locomotive/motor train unit, and the contact net is completely exposed in an external environment, so that icing is easy to occur in certain low-temperature, high-humidity and high-altitude areas. The normal current taking of the locomotive is influenced by the icing of the contact network, even the power supply network is damaged to cause the power supply interruption, and the normal operation of the electrified railway is seriously threatened. China has broad members, complex and various terrains and changeable climate, and a large number of railway trunks face the threat of contact net icing in the Chinese area and the southwest mountain area. For example, in the ice and snow disaster of 2008, a plurality of trunk lines in Guizhou, hunan and the like are subjected to power supply interruption due to icing of a contact network, so that shutdown is caused, and huge economic loss is caused.
In recent years, as the electrified railways in China continuously develop towards high speed and heavy load, the realization of efficient anti-icing and deicing of contact networks becomes a key and technical difficulty for ensuring safe and reliable power supply of the electrified railways in severe environments. At present, the ice coating solution for power transmission lines and railway overhead contact systems at home and abroad mainly comprises a mechanical ice removing method and a thermal ice melting method. The mechanical deicing method mainly comprises scraping deicing and vibrating wires, needs a large amount of human resources, and is long in time consumption, low in efficiency and poor in field operation safety; the thermal ice melting method utilizes joule law, and the temperature of the wire is raised by circulating large current on the ice coating line, so as to achieve the purpose of melting and dropping the coated ice.
The DC ice melting technology is a preferred scheme for solving the problem of ice coating of the power transmission line in the power system because the advantages of line reactance, small equipment capacity, high ice melting efficiency and the like are not required to be considered. However, since ice coating of the lines only occurs in severe weather conditions such as rain, snow and ice in winter and spring, and the ice melting device only works in a "skylight" time period of railway operation, the ice melting equipment is idle for most of the time, and the utilization rate is very low.
Disclosure of Invention
The invention aims to provide a direct-current deicing device for an electrified railway overhead line system and a control method thereof.
The technical scheme for realizing the purpose of the invention is as follows:
a direct-current deicing device for an electrified railway contact network comprises a source storage device; the source storage device comprises a left AC/DC converter and a right AC/DC converter, the alternating current end of the left AC/DC converter is connected to the alpha-phase bus through a left inductor and a left step-down transformer in sequence, the alternating current end of the right AC/DC converter is connected to the beta-phase bus through a right inductor and a right step-down transformer in sequence, and the direct current ends of the left AC/DC converter and the right AC/DC converter are respectively provided with a left capacitor and a right capacitor; the anodes of the left AC/DC converter and the right AC/DC converter are connected and connected to the anode of the energy storage system through a breaker QF5, and the cathodes of the left AC/DC converter and the right AC/DC converter are connected and connected to the cathode of the energy storage system through a breaker QF6; the circuit breaker QF7 is further included, so that the positive pole of the left AC/DC converter is connected to the positive pole of the right AC/DC converter through the QF7, and the positive pole of the left AC/DC converter is connected to the positive pole of the energy storage system through the QF 5; the breaker QF8 is further included, so that the negative electrode of the left AC/DC converter is connected to the negative electrode of the right AC/DC converter through the QF8, and the negative electrode of the right AC/DC converter is connected to the negative electrode of the energy storage system through the QF6; the anode of the left AC/DC converter is also connected to the cathode of the right AC/DC converter through a breaker QF11; the cathode of the left AC/DC converter is further connected to an alpha-phase uplink contact network through an isolating switch QS9 and a breaker QF9 in sequence, and the anode of the right AC/DC converter is further connected to a beta-phase downlink contact network through an isolating switch QS10 and a breaker QF10 in sequence; when the direct-current ice melting device works in a direct-current anti-icing and ice melting mode, QF5, QF6, QF7 and QF8 are disconnected, and QS9, QS10, QF9, QF10 and QF11 are closed; when the direct current ice melting device works in a regenerative braking energy utilization mode, QS9, QS10, QF9, QF10 and QF11 are disconnected, and QF7 and QF8 are closed.
The control method of the device comprises the following steps,
step 1: judging whether the contact network is on the traffic, if not, continuing;
step 2: if the external environment temperature T of the contact net is less than or equal to 0 ℃, continuing;
and 3, step 3: the direct-current ice melting device works in a direct-current anti-icing and ice melting mode, and the method specifically comprises the following steps:
3.1 cutting off QF5 and QF6;
3.2 disconnection: a circuit breaker QF1 from an alpha-phase bus to an alpha-phase downlink contact network, a circuit breaker QF2 from the alpha-phase bus to an alpha-phase uplink contact network, a circuit breaker QF3 from a beta-phase bus to a beta-phase uplink contact network, and a circuit breaker QF4 from the beta-phase bus to a beta-phase downlink contact network; 3.3, closing: an isolating switch QS5 of the alpha-phase uplink contact network and the beta-phase uplink contact network, an isolating switch QS6 of the alpha-phase uplink contact network and the alpha-phase downlink contact network, an isolating switch QS7 of the alpha-phase downlink contact network and the beta-phase downlink contact network, and an isolating switch QS8 of the beta-phase uplink contact network and the beta-phase downlink contact network;
3.4 opening QF7 and QF8 and closing QF11;
3.5 closing QS9, QS10, QF9, QF10;
and 3.6 setting the direct-current side voltage reference values of the left-side AC/DC converter and the right-side AC/DC converter as ice melting voltages.
The further technical proposal also comprises that,
and 4, step 4: judging whether the overhead contact system is iced, if so, enabling the direct-current deicing device to continuously work in a direct-current anti-icing and deicing mode; if not, the direct current ice melting device is switched to a regenerative braking energy utilization mode;
and 5: judging whether the overhead contact system is on the bus or not, if not, enabling the direct-current ice melting device to continuously work in a direct-current anti-icing and ice melting mode; if so, converting the direct-current ice melting device into a regenerative braking energy utilization mode;
the direct-current ice melting device is converted into a regenerative braking energy utilization mode, and the method specifically comprises the following steps:
4.1 turn off QF9, QF10, turn off QS5, QS7, QS9, QS10;
4.2, closing QF7 and QF8 and disconnecting QF11;
4.3 closed QF1, QF2, QF3, QF4;
4.4 setting the DC side voltage reference value of the left side AC/DC converter and the right side AC/DC converter as the initial voltage.
According to a further technical scheme, the method also comprises a step 4.3' between the steps 4.3 and 4.4; the step 4.3' is: maintaining QS6, QS8 closed; or, turn QS6, QS8 off, and turn QF5, QF6 on; alternatively, QS6, QS8 are kept closed, and QF5, QF6 are closed.
Compared with the prior art, the invention has the beneficial effects that:
1. the direct-current ice melting device is based on an existing source storage device of a line, and when the direct-current ice melting device works in a direct-current ice preventing and melting mode, the high-capacity direct-current ice preventing and melting requirements of a contact network can be met.
2. After the direct-current ice melting device is converted into a regenerative braking energy utilization mode, the regenerative braking energy of the locomotive can be effectively utilized, and the energy efficiency, the electric energy quality and the reliability of a power supply system of the electrified railway are improved.
3. The control method of the direct-current de-icing device is simple to operate and easy to realize, the two working modes are switched according to needs in real time, the utilization rate of equipment is high, and the occupied area and the economic cost for setting the new de-icing device are saved.
Drawings
Fig. 1 is a schematic structural diagram of a traction power supply system full-line installation direct-current ice melting device.
Fig. 2 is a flow chart of the switching of the device between two operating modes.
FIG. 3 is a schematic diagram of system connections when the device is operating in DC anti-icing and de-icing mode.
FIG. 4 is a schematic diagram of the system connections when the device is operating in a regenerative braking energy utilization mode.
FIG. 5 is a schematic diagram of a data processing and control system of the apparatus.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The direct-current deicing device for the overhead line system of the electrified railway, provided by the invention, can meet the requirements of high-capacity direct-current deicing and deicing of the overhead line system, and can effectively utilize the regenerative braking energy of an electric locomotive, improve the energy efficiency and the power supply reliability of the system and improve the electric energy quality of the system. The device can be switched between a direct-current anti-icing and ice-melting mode and a regenerative braking energy utilization mode in real time according to needs, so that the utilization rate of equipment is improved, and the investment cost is saved.
As shown in fig. 1, from the whole view, a set of dc ice melting device needs to be configured in each traction substation, the device takes electricity from the 27.5kV bus on the secondary side of the traction transformer, and the zoning substations are arranged between the traction substations, and the ice melting devices of each traction substation operate independently. The device can contain a hybrid energy storage system inside, and new energy resources (such as wind power and photovoltaic) along the line are accessed according to the line condition.
Viewed individually, the internal ice melting device can be divided into a left converter and a right converter which are identical, and each converter comprises an alternating current side inductor, a direct current side capacitor and a bridge circuit composed of controllable devices (such as IGBT and IGCT). The alternating current side inductor plays a role in filtering, the direct current side capacitor plays a role in stabilizing voltage, and a bridge circuit composed of controllable devices can be controlled by the SPWM to be switched on and switched off to form direct current output with controllable voltage values.
Specifically, a left converter and a right converter of the device are connected back to back and are respectively connected to a secondary side 27.5kV bus of the traction transformer through an isolation type step-down transformer. When the device works, the isolated step-down transformers on two sides of the back-to-back converter step down the 27.5kV single-phase high-voltage alternating current into single-phase low-voltage alternating current (such as 1500V), then the single-phase low-voltage alternating current is rectified into direct current with different voltage levels through the converter, the direct current side in the middle of the converter is connected through a circuit breaker, and the direct current side outputs and is connected with a voltage stabilizing capacitor in parallel. When the device works in a direct-current anti-icing and ice-melting mode, the direct-current ports on the left side and the right side of the device are connected in series through the circuit breakers, and then the positive pole and the negative pole which are connected in series are respectively connected to an alpha uplink contact net and a beta downlink contact net. When the device works in a regenerated energy utilization mode, the direct current ports on the left side and the right side of the device are connected in parallel through the circuit breaker, and a connecting wire is led out to provide a grid-connected interface for an energy storage and new energy system; in addition, the left and right side up-going and down-going power supply arms are respectively connected to an output feeder of a 27.5kV bus through a disconnecting switch and a breaker.
According to the control method of the device, the data processing and control system controls the corresponding circuit breaker and the isolating switch according to the feedback signal of the contact network environmental parameter monitoring unit, so that the source storage-ice melting device works in different modes. As shown in fig. 2, the specific implementation steps are as follows:
step one, judging whether a line is communicated in a short time according to an on-board positioning device and a running chart;
if so, enabling the device to work in a regenerative braking energy utilization mode; otherwise, the next step is carried out.
And step two, starting the contact network environmental parameter monitoring unit.
Step three, judging the external environment temperature T at the moment according to a feedback signal of a temperature sensor in the contact network environment parameter monitoring unit;
if T is less than or equal to 0 ℃, entering the next step; otherwise, the external environment temperature is continuously compared.
And step four, detecting the switching-on and switching-off states of each breaker and each disconnecting switch in the device, and switching the switching-on and switching-off states into a direct-current anti-icing and ice-melting mode, wherein a specific switching-off operation process comprises the following steps:
4.1 if the new energy system and the energy storage system are in a grid-connected operation state, disconnecting the breakers QF5 and QF6 on the leading-out connecting line at the middle direct current side, and stopping the new energy system and the energy storage system from operating;
4.2 disconnecting the feeder circuit breakers QF1, QF2, QF3 and QF4 output by the traction substation;
4.3, closing isolating switches QS5, QS6, QS7 and QS8 to form an uplink and downlink parallel direct-current ice melting loop;
4.4 disconnecting the breakers QF7 and QF8 at the middle direct current side of the back-to-back converter, closing the breaker QF11, and changing the direct current ports of the single-phase converters at the two sides of the back-to-back converter from parallel connection to series connection;
and 4.5, closing disconnecting switches QS9 and QS10, closing circuit breakers QF9 and QF10, and supplying power to a contact net through a back-to-back converter direct current series port.
Step five, starting the data processing and control system, and setting the voltage reference value of the middle direct current side of the back-to-back converter as the ice melting voltage U dc0 And the device works in a direct-current anti-icing and ice-melting mode of the contact network.
And step six, judging the icing condition of the contact network by combining the networking meteorological data information and the contact network state video camera according to a sensor feedback signal in the contact network environmental parameter monitoring unit. If the contact net is iced, the states of the circuit breakers and the isolating switches are unchanged, and the device continues to work in a direct-current anti-icing and ice-melting mode; otherwise, entering step eight.
And seventhly, judging whether the line is communicated in a short time according to the positioning device on the vehicle and the running chart of the vehicle. If not, the states of the circuit breakers and the isolating switches are not changed, and the device continues to work in a direct-current anti-icing and ice-melting mode; if yes, go to step eight.
Step eight, detecting the switching-on and switching-off states of each breaker and each isolating switch in the device, and switching the switching-on and switching-off states to a regenerative braking energy utilization mode, wherein the second switching-off operation process comprises the following specific steps:
8.1 disconnecting the circuit breakers QF9 and QF10, disconnecting the isolating switches QS5, QS7, QS9 and QS10, and separating the alpha power supply arm and the beta power supply arm by utilizing an electric phase splitting;
8.2 closing the breakers QF7 and QF8 at the middle direct current side of the back-to-back converter, disconnecting the breaker QF11 and connecting the direct current ports of the single-phase converters at the two sides of the back-to-back converter in parallel;
8.3 closing output feeder circuit breakers QF1, QF2, QF3 and QF4 of the traction substation;
8.4 this step can be performed selectively: the isolating switches QS6 and QS8 where the subareas are located are kept closed, and the tail ends of the uplink and downlink lines run in parallel, so that the grid voltage fluctuation at the tail end of the power supply arm can be reduced; or disconnecting the isolating switches QS6 and QS8 where the subareas are located, closing the circuit breakers QF5 and QF6 on the leading-out connecting line at the middle direct current side, and realizing grid-connected operation of the new energy system and the energy storage system; or the QS6 and QS8 isolating switches where the subareas are located are kept closed, the breakers QF5 and QF6 are closed, the tail ends of the uplink and downlink lines run in parallel, and the grid-connected running of the new energy system and the energy storage system is realized.
Step nine, starting the data processing and control system, and setting the reference value of the voltage at the middle direct current side of the back-to-back converter as an initial voltage U dc1 The device operates in a regenerative braking energy utilization mode.
FIG. 3 is a schematic diagram of system connections when the device is operating in DC anti-icing and de-icing mode.
Wherein, taking CTMH-150 type contact wire and JTMH-120 type carrier cable as an example, the equivalent direct current resistance of the circuit is about 5 omega when the series connection of the upper contact wire and the lower contact wire is adopted as the ice melting loop according to the calculation of the single power supply arm length of 25 km. At the moment, the melting required by the DC ice melting is realizedThe ice current is 1000A, therefore the series ice melting voltage is 5000V, and the left and right side converters are symmetrical in structure, so that the reference value of the voltage at the middle direct current side of the back-to-back converters is set as the ice melting voltage U dc0 And if the voltage is not less than 2500V, the device works in a direct-current anti-icing and ice-melting mode of a contact network. During working, the ice melting current and the ice melting voltage can be controlled in real time according to the external environment condition, and effective ice prevention and efficient ice melting in an ice coating state under a low-temperature condition are realized.
When the device works in a direct-current anti-icing and ice-melting mode, the energy storage system and the new energy system quit operation. Therefore, when the source storage-ice melting device in the traction power substation does not comprise an energy storage system or a new energy system, the device can still be used for DC ice prevention and ice melting.
FIG. 4 is a schematic diagram of the system connections when the device is operating in a regenerative braking energy utilization mode.
Setting the reference value of the voltage at the middle direct current side of the back-to-back converter as an initial voltage U dc1 And =3600V, detecting voltage values and current values on the alpha and beta power supply arms in real time, calculating to obtain instantaneous power on the power supply arms on two sides, realizing power interaction of the two arms by controlling four-quadrant operation of the back-to-back converter, balancing active power of the two arms and reducing negative sequence of the system.
According to a system energy management strategy, regenerative braking energy on one power supply arm is transmitted to a traction locomotive on the other power supply arm for use, and residual regenerative braking energy is stored in an energy storage system, or during the operation of close traffic on a line, the energy storage system is controlled to release energy to the power supply arm, and a new energy system is controlled to provide energy to the power supply arm, so that the energy conservation and consumption reduction of a traction power supply system are realized, and the energy utilization efficiency is improved.
If the capacity of the back-to-back converter is residual, the reactive power and negative sequence compensation functions are started, and the current with the same amplitude and opposite phase with the reactive power and harmonic current measured by the power supply arm is output through the converter, so that the comprehensive management of the electric energy quality is realized.
FIG. 5 is a schematic diagram of a data processing and control system of the apparatus.
Wherein, according to the sensor feedback signal in the contact net environmental parameter monitoring unit, judge whether start direct current anti-icing, ice-melt function, specifically do:
1) The contact network environmental parameter monitoring unit comprises a temperature sensor, a humidity sensor and a wind speed sensor, and the three sensors are used for respectively detecting the temperature, the humidity and the wind speed conditions in the environment where the contact network is located;
2) And converting the detection result of the sensor into a specified signal, feeding the specified signal back to the data processing and control system, and combining the networking meteorological data information and the contact network state video camera to judge the icing condition of the contact network and send a corresponding control instruction.
3) Because the voltage of the direct-current output end of the back-to-back converter is controllable, the ice melting voltage can be controllably adjusted according to the ice coating state of the line, and then the line passes through short-circuit currents with different sizes, so that effective ice prevention under low-temperature conditions and efficient ice melting in the ice coating state are realized.
Claims (4)
1. A direct-current deicing device for an electrified railway contact network comprises a source storage device; the source storage device comprises a left AC/DC converter and a right AC/DC converter, the alternating current end of the left AC/DC converter is connected to the alpha-phase bus through a left inductor and a left step-down transformer in sequence, the alternating current end of the right AC/DC converter is connected to the beta-phase bus through a right inductor and a right step-down transformer in sequence, and the direct current ends of the left AC/DC converter and the right AC/DC converter are respectively provided with a left capacitor and a right capacitor; the anodes of the left AC/DC converter and the right AC/DC converter are connected and connected to the anode of the energy storage system through a breaker QF5, and the cathodes of the left AC/DC converter and the right AC/DC converter are connected and connected to the cathode of the energy storage system through a breaker QF6; the circuit breaker QF7 is further included, so that the anode of the left AC/DC converter is connected to the anode of the right AC/DC converter through the QF7, and the anode of the left AC/DC converter is connected to the anode of the energy storage system through the QF 5; the breaker QF8 is further included, so that the negative electrode of the left AC/DC converter is connected to the negative electrode of the right AC/DC converter through the QF8, and the negative electrode of the right AC/DC converter is connected to the negative electrode of the energy storage system through the QF6; the anode of the left AC/DC converter is also connected to the cathode of the right AC/DC converter through a breaker QF11; the negative electrode of the left AC/DC converter is also connected to an alpha-phase uplink contact network through an isolating switch QS9 and a breaker QF9 in sequence, and the positive electrode of the right AC/DC converter is also connected to a beta-phase downlink contact network through an isolating switch QS10 and a breaker QF10 in sequence; when the direct-current ice melting device works in a direct-current anti-icing and ice melting mode, QF5, QF6, QF7 and QF8 are disconnected, and QS9, QS10, QF9, QF10 and QF11 are closed; when the direct current ice melting device works in a regenerative braking energy utilization mode, QS9, QS10, QF9, QF10 and QF11 are disconnected, and QF7 and QF8 are closed.
2. The control method of the direct-current deicing device for the overhead contact system of the electrified railway of claim 1, comprising,
step 1: judging whether the contact network is on traffic or not, if not, continuing;
step 2: if the external environment temperature T of the contact net is less than or equal to 0 ℃, continuing;
and 3, step 3: the direct-current ice melting device works in a direct-current anti-icing and ice melting mode, and the method specifically comprises the following steps:
3.1 cutting off QF5 and QF6;
3.2, disconnection: a circuit breaker QF1 from an alpha-phase bus to an alpha-phase downlink contact network, a circuit breaker QF2 from the alpha-phase bus to an alpha-phase uplink contact network, a circuit breaker QF3 from a beta-phase bus to a beta-phase uplink contact network, and a circuit breaker QF4 from the beta-phase bus to a beta-phase downlink contact network;
3.3, closing: an isolating switch QS5 of the alpha-phase uplink contact network and the beta-phase uplink contact network, an isolating switch QS6 of the alpha-phase uplink contact network and the alpha-phase downlink contact network, an isolating switch QS7 of the alpha-phase downlink contact network and the beta-phase downlink contact network, and an isolating switch QS8 of the beta-phase uplink contact network and the beta-phase downlink contact network;
3.4 opening QF7 and QF8 and closing QF11;
3.5 close QS9, QS10, close QF9, QF10;
and 3.6 setting the direct-current side voltage reference values of the left AC/DC converter and the right AC/DC converter as the ice melting voltage.
3. The control method of the device for melting ice in a direct current of an overhead contact system of an electrified railway of claim 2, further comprising,
and 4, step 4: judging whether the overhead contact system is iced, if so, enabling the direct-current deicing device to continuously work in a direct-current anti-icing and deicing mode; if not, the direct current ice melting device is switched to a regenerative braking energy utilization mode;
and 5: judging whether the overhead contact system is on the bus or not, if not, enabling the direct-current ice melting device to continuously work in a direct-current anti-icing and ice melting mode; if yes, the direct current ice melting device is switched to a regenerative braking energy utilization mode;
the direct-current ice melting device is converted into a regenerative braking energy utilization mode, and the method specifically comprises the following steps:
4.1 turn off QF9, QF10, turn off QS5, QS7, QS9, QS10;
4.2, closing QF7 and QF8 and opening QF11;
4.3 closed QF1, QF2, QF3, QF4;
4.4 setting the DC side voltage reference value of the left side AC/DC converter and the right side AC/DC converter as the initial voltage.
4. The control method of the device for melting ice in a direct current of an overhead contact system of an electrified railway according to claim 3, characterized in that between the steps 4.3 and 4.4, the method further comprises the step 4.3';
the step 4.3' is as follows: maintaining QS6, QS8 closed; or, QS6, QS8 is opened, and QF5, QF6 are closed; or,
keep QS6, QS8 closed, close QF5, QF6.
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| CN102195260B (en) * | 2011-05-29 | 2013-11-20 | 西南交通大学 | Power-frequency online anti-icing de-icing method for electrified railway contact network |
| CN107215246B (en) * | 2017-05-22 | 2020-05-12 | 北京千驷驭电气有限公司 | Intelligent ice melting system of contact network |
| CN112260198B (en) * | 2020-09-28 | 2024-09-27 | 北京交通大学 | Multifunctional rail transit direct-current online ice melting system and method |
| CN112260199B (en) * | 2020-09-28 | 2024-07-23 | 北京交通大学 | Rail transit communication online ice melting system and method |
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