CN113442798A - Rail transit power supply system and control method thereof - Google Patents
Rail transit power supply system and control method thereof Download PDFInfo
- Publication number
- CN113442798A CN113442798A CN202010231332.6A CN202010231332A CN113442798A CN 113442798 A CN113442798 A CN 113442798A CN 202010231332 A CN202010231332 A CN 202010231332A CN 113442798 A CN113442798 A CN 113442798A
- Authority
- CN
- China
- Prior art keywords
- power supply
- station
- direct current
- power
- subinterval
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a rail transit power supply system and a control method thereof, wherein the power supply system comprises a control subsystem and a plurality of power supply intervals, a first switch unit is connected between every two adjacent power supply intervals, and each power supply interval is used for supplying power to a plurality of stations; the power supply section includes: the transformer substation is used for carrying out voltage reduction and rectification treatment on alternating current commercial power; the direct current looped network is connected with the output end of the substation; the power supply and distribution station is used for supplying the electric energy of the direct current ring network to a direct current load; each direct current power supply corresponds to one power supply sub-interval and is used for supplying power to at least one station, and a second switch unit is connected between every two adjacent power supply sub-intervals; the control subsystem is used for controlling at least one of the first switch unit, the power substation, the power supply and distribution station, the direct current power supply and the second switch unit. The power supply system can reduce the voltage level, reduce the number of equipment and the volume of the equipment, reduce the equipment investment and improve the electric energy utilization rate and the power supply reliability.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a rail transit power supply system and a control method of the rail transit power supply system
Background
The modern rail transit power supply and distribution system mainly uses alternating voltage, adopts a medium-voltage alternating current looped network technology, and is provided with a substation independently at each station for converting medium-voltage alternating current into low-voltage alternating current to supply power for station alternating current loads. Because the alternating current medium voltage looped network has high voltage level, high requirements on power supply and distribution equipment, large equipment volume and large occupied station space, a substation needs to be arranged at each station, and a large number of converter devices are needed if power is supplied to a direct current load, so that the investment is large.
With the development of new energy technology, more and more distributed energy sources are incorporated into the power grid, so that the composition of the power supply and the load in the power grid are obviously changed. Distributed energy sources such as a photovoltaic power generation system, an energy storage system and the like supply power in a direct current mode, if the direct current power supply is connected to an alternating current power grid, a DC/AC inverter is required to be used for electric energy conversion, so that electric energy loss is large, when the direct current power supply and a direct current load are connected to the alternating current power supply system, the frequency, power factor, harmonic wave, line impedance and other problems of the system need to be considered, and the power supply reliability is low.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the first objective of the present invention is to provide a rail transit power supply system, so as to reduce the number of devices and the volume of the devices, reduce the investment of the devices, improve the utilization rate of electric energy and the reliability of a station power supply system, and improve the convenience of control.
In order to achieve the above object, a first embodiment of the present invention provides a rail transit power supply system, where the rail transit power supply system includes a control subsystem and a plurality of power supply sections, each of the power supply sections is configured to supply power to a plurality of stations, two adjacent power supply sections are connected through a first switch unit, and each of the power supply sections includes:
the input end of the substation is connected with a mains supply inlet wire, and the substation is used for carrying out voltage reduction treatment on alternating-current mains supply and converting alternating current after voltage reduction treatment into direct current; the direct current ring network is connected with the output end of the substation and comprises station direct current buses arranged at each station and a first switch unit connected between the station direct current buses of two adjacent stations; the power supply and distribution station comprises a low-voltage direct-current bus and a voltage conversion unit, wherein the voltage conversion unit is connected between the low-voltage direct-current bus and a station direct-current bus of a corresponding station, and the low-voltage direct-current bus is used for connecting a direct-current load of the corresponding station; each direct current power supply corresponds to one power supply sub-interval and is used for supplying power to at least one station, two adjacent power supply sub-intervals are connected through a second switch unit, and the direct current power supply is connected with a station direct current bus and/or a low-voltage direct current bus of the station where the direct current power supply is located; the control subsystem is configured to acquire a working state of the power supply system, and control at least one of the first switch unit, the substation, the voltage conversion unit, the dc power supply, and the second switch unit according to the working state.
According to the rail transit power supply system provided by the embodiment of the invention, a substation is not required to be arranged at each station, a medium-voltage alternating-current ring network is not required, a substation and a direct-current ring network are adopted to supply power to the power supply and distribution station at each station, a large number of middle current transformation links are omitted, the number and the size of equipment are greatly reduced, the equipment investment is reduced, a plurality of factors such as the frequency, the power factor, the harmonic wave and the line impedance of the system are not required to be considered, a large number of inverters are not required, the electric energy loss in the electric energy conversion process can be reduced, and the electric energy utilization efficiency is improved. Meanwhile, the direct-current power supplies are arranged at the stations, power supply for the power supply and distribution station of each station can be realized through the direct-current power supplies and the direct-current ring network, a current transformation link is not needed, various power supply and distribution schemes can be realized together with commercial power supply, and the reliability of power supply is improved. And only the direct current load is supplied with power, so that the power supply and distribution control is simpler and more convenient.
In order to achieve the above object, a second aspect of the present invention provides a control method for a rail transit power supply system, where the control method is used to control the rail transit power supply system in the above embodiment, and the control method includes the following steps:
detecting whether the power supply system is abnormal; if the power supply system is not abnormal, controlling the first switch unit and the second switch unit to be in a disconnected state, and controlling all direct-current power supplies to supply power to stations in power supply sub intervals where the direct-current power supplies are located; in the process of supplying power by a direct current power supply, if a direct current power supply which cannot meet the power supply requirement or has a fault exists, controlling at least one second switch unit connected with a passive power supply subinterval or a fault power supply subinterval to be closed so that the direct current power supply of the passive power supply subinterval or the adjacent power supply subinterval of the fault power supply subinterval supplies power to a station of the passive power supply subinterval or the fault power supply subinterval, wherein the passive power supply subinterval is the power supply subinterval where the direct current power supply which cannot meet the power supply requirement exists, and the fault power supply subinterval is the power supply subinterval where the direct current power supply with the fault exists; and if the direct-current power supply of the passive power supply subinterval or the adjacent power supply subinterval of the fault power supply subinterval cannot meet the power supply requirement, controlling all second switch units of the power supply interval where the passive power supply subinterval or the fault power supply subinterval is positioned to be closed, and controlling the substation of the power supply interval to work so as to supply power to the stations of the power supply interval through the commercial power.
According to the control method of the rail transit power supply system, the rail transit power supply system based on the embodiment is controlled, various power supply schemes can be achieved, the reliability of power supply can be guaranteed, the voltage level is low, the number of required devices is small, the occupied space of the devices is small, the investment is small, and the electric energy utilization rate is high.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a rail transit power supply system according to a first embodiment of the invention;
fig. 2 is a schematic structural diagram of a rail transit power supply system according to a second embodiment of the invention;
fig. 3 is a schematic structural diagram of a rail transit power supply system according to a third embodiment of the invention;
fig. 4 is a flowchart of a control method of a rail transit power supply system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A rail transit power supply system and a control method thereof of an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a rail transit power supply system according to an embodiment of the present invention.
The rail transit power supply system is used for supplying power to a plurality of stations, as shown in fig. 1, the power supply system 100 includes a control subsystem 200 and a plurality of power supply sections, each power supply section is used for supplying power to a plurality of stations, and two adjacent power supply sections are connected through a first switch unit. In this embodiment, a power supply section 100 in fig. 1 is taken as an example for presentation, where the power supply section 100 includes: the power substation 10, the direct current ring network 20, the power supply and distribution station 30 and the at least one direct current power supply 40 arranged at each station are connected by a first switch unit between two adjacent power supply intervals, that is, the direct current ring networks in the two adjacent power supply intervals are connected by the first switch unit.
Referring to fig. 1, the dc ring network 20 includes station dc buses provided at each station and a dc cable connected between the station dc buses of two adjacent stations. The input end of the substation 10 is connected with a mains supply inlet wire, the output end of the substation 10 is connected with the direct current looped network 20, and the substation 10 is used for carrying out voltage reduction processing on alternating current mains supply (such as 10kV and 35kV medium-voltage alternating current), converting the alternating current after voltage reduction processing into direct current (such as 1500V and 7500V direct current), and supplying the direct current looped network 20. In one example, referring to fig. 1, the output of the substation 10 is connected to a station dc bus at a station where the substation 10 is located. Specifically, the power supply section 100 may include a plurality of stations and one substation 10, and the substation 10 may be installed in one of the plurality of stations.
In one example, the substation 10 includes a transformer T and an AD/DC converter 12. Specifically, the high-voltage end of the transformer T is connected to the mains inlet via a high-voltage AC bus, the low-voltage end of the transformer T is connected to the AC end of the AC/DC converter 12, and the DC end of the AC/DC converter 12 is connected to a station DC bus of a station where the substation 10 is located. When the rail transit power supply system 100 is powered by the commercial power, the transformer T is used for performing voltage reduction processing on the alternating-current commercial power, and the AD/DC converter 12 is used for converting the alternating current after the voltage reduction processing into direct current.
Referring to fig. 1, the power distribution station 30 includes a low-voltage dc bus and a voltage conversion unit 31, where the voltage conversion unit 31 is connected between the low-voltage dc bus and a station dc bus of a corresponding station, and the low-voltage dc bus is used to connect a dc load 1 of the corresponding station. In one example, the voltage conversion unit 31 includes a DC/DC converter 311, a first DC terminal of the DC/DC converter 311 is connected to a station DC bus of a corresponding station, and a second DC terminal of the DC/DC converter 311 is connected to a low voltage DC bus of the corresponding station.
Each direct current power supply corresponds to one power supply sub-interval and is used for supplying power to at least one station, two adjacent power supply sub-intervals are connected through a second switch unit, and the direct current power supply is connected with a station direct current bus (shown in figure 1) and/or a low-voltage direct current bus (shown in figure 2) of the station where the direct current power supply is located. Specifically, the power supply subinterval may include at least one station, one dc power supply, and the dc power supply may be disposed at one of the at least one station. In an example, taking two stations as an example to be provided with one dc power supply 40, referring to fig. 1, the dc power supply 40 is provided in one of the two stations, the power supply sub-zone corresponding to the dc power supply 40 is the station where the dc power supply is located and the station adjacent to the station, and the two stations form one power supply sub-zone.
In this embodiment, the control subsystem 200 may be configured to obtain an operating status of the power supply system 100 and control at least one of the first switching unit, the power substation 10, the power distribution station 30, the dc power source 40, and the second switching unit according to the operating status.
For example, 24 stations can be arranged on one rail vehicle operation line, every 6 stations can be used as a power supply section, each power supply section is provided with a substation 10, and the direct current ring networks 20 of two adjacent power supply sections are connected through a first switch unit. When each power supply interval can independently supply power, the control subsystem 200 can control the substation and each power supply and distribution station of each power supply interval to work and control each first switch unit to be in an off state; when a certain power supply section cannot supply power by itself, the control subsystem 200 may control the substation in the power supply section that can supply power by itself to operate, and control the previous and/or next first switch unit connected to the dc ring network 20 in the power supply section to be closed, so as to supply power through the adjacent power supply section.
Furthermore, in each power supply interval, every 3 stations can be used as a power supply interval, each power supply interval can be provided with a direct current power supply, and the station direct current buses of the stations on two sides in two adjacent power supply intervals are connected through the second switch unit. When each power supply sub-interval can supply power independently, the control subsystem 200 can control the direct current power supply and each power supply and distribution station of each power supply interval to work and control each second switch unit to be disconnected, and when a certain power supply sub-interval can not supply power by itself, the control subsystem 200 can control at least one of the first switch units connected with the station direct current buses of the stations at two sides of the power supply sub-interval to be closed so as to supply power through the adjacent power supply sub-intervals. Of course, the division manner of the power supply section is only exemplary, and the division manner of the power supply section is not limited thereto, and for example, a dc power supply may be provided for each station, that is, each power supply section includes 6 power supply subintervals.
Therefore, compared with the traditional rail transit power supply system, the rail transit power supply system provided by the embodiment of the invention does not need to arrange a substation at each station and a medium-voltage alternating-current ring network, adopts the substation and the direct-current ring network to supply power to the power supply and distribution station at each station, saves a large number of intermediate current transformation links, greatly reduces the number and the volume of equipment, reduces the equipment investment, does not need to consider a plurality of factors such as the frequency, the power factor, the harmonic wave, the line impedance and the like of the system, does not need a large number of inverters, further can reduce the electric energy loss in the electric energy conversion process, and improves the electric energy utilization efficiency. Meanwhile, the direct-current power supplies are arranged at the stations, power supply for the power supply and distribution station of each station can be realized through the direct-current power supplies and the direct-current ring network, a current transformation link is not needed, various power supply and distribution schemes can be realized together with commercial power supply, and the reliability of power supply is improved. And only the direct current load is supplied with power, so that the power supply and distribution control is simpler and more convenient.
According to an embodiment of the invention, referring to fig. 1 and 2, each of the first switch unit and the second switch unit may include a first switch K1 and a second switch K2, such that the first switch K1, the dc cable and the second switch K2 are connected in sequence between the station dc buses of two adjacent stations. The first switch K1 can be used as a feeder switch of a power supply sub-interval where the station direct-current bus is directly connected with the first switch, and the second switch K2 can be used as an incoming switch of the power supply sub-interval where the station direct-current bus is directly connected with the second switch. Therefore, the control subsystem 200 can realize the disconnection of the corresponding switch unit by controlling the disconnection of the first switch K1 and/or the second switch K2, and further realize the disconnection of the corresponding power supply sections or the disconnection between the power supply sub sections; and the corresponding switch units can be closed by controlling the closing of the first switch K1 and the second switch K2, so that the communication between the corresponding power supply intervals or the communication between the power supply sub-intervals is realized.
Optionally, when the power supply sub-section includes at least two stations, a third switch unit may be further connected between the station dc buses of two adjacent stations, and the third switch unit may also include a first switch K1 and a second switch K2, where the first switch K1 may serve as a feeder switch of the station where the station dc bus directly connected to the first switch is located, and the second switch K2 may serve as an incoming line switch of the station where the station dc bus directly connected to the second switch is located, and thus, independent control of each station may be facilitated. For example, the station 1 and the station 2 arranged in sequence are the power supply sub-section 1, the station 3 and the station 4 are the power supply sub-section 2, and the station 5 and the station 6 are the power supply sub-section 3, wherein the station 2, the station 4 and the station 6 are all provided with a direct current power supply, when the direct current power supply of the station 4 is abnormal, the station 3 and the station 4 can be supplied with power by the power supply sub-section 1 or the power supply sub-section 2 as a whole, or the disconnection of a third switch unit between the station 3 and the station 4 can be controlled, the station 3 is supplied with power by the power supply sub-section 1, and the station 4 is supplied with power by the power supply sub-section 3. Compared with the integral power supply, the split power supply can reduce the load of a single direct current power supply and is more beneficial to ensuring the reliability of power supply.
Referring to fig. 1 and 2, the power substation 10 may further include a third switch K3 and a fourth switch K4, where the third switch K3 is connected between the DC terminal of the AC/DC converter 12 and a station DC bus of a station where the power substation 10 is located, and the fourth switch K4 is connected between the high-voltage terminal of the transformer T and the high-voltage power supply bus. Therefore, the control subsystem 200 can control at least one of the third switch K3 and the third switch K4 to be turned off, so that no commercial power is introduced into the corresponding substation; and the corresponding power substation is introduced to supply the commercial power by controlling the closing of the third switch K3 and the third switch K4.
Referring to fig. 1 and 2, the voltage conversion unit 31 may further include a fifth switch K5 and a sixth switch K6, wherein the fifth switch K5 is connected between the first DC terminal of the DC/DC converter 311 and the station DC bus of the corresponding station, and the sixth switch K6 is connected between the second DC terminal of the DC/DC converter 311 and the low voltage DC bus of the corresponding station. Therefore, the control subsystem 200 can control the on and off of the circuit where the power distribution substation 30 is located by controlling the on and off of the fifth switch K5 and the sixth switch K6.
Optionally, a seventh switch K7 may be connected between the dc load 1 and the corresponding low voltage dc bus. Therefore, the control subsystem 200 can control the on-off of the seventh switch K7 to realize the on-off of the loop where the load is located.
According to an embodiment of the present invention, referring to fig. 1 and 2, the dc power source 40 may be a distributed power source, and the dc power source 40 may include a photovoltaic unit 41 and an energy storage unit 42. The photovoltaic unit 41 is connected with a station direct current bus or a low-voltage direct current bus of a station where the photovoltaic unit is located; the energy storage unit 42 is connected to a station dc bus or a low-voltage dc bus of a station where the energy storage unit 42 is located, where fig. 3 only shows that the photovoltaic unit 41 is connected to the station dc bus of the station where the energy storage unit 42 is located. Optionally, referring to fig. 1 and fig. 2, switches, which are respectively marked as an eighth switch K8 and a ninth switch K9, may be connected between the photovoltaic unit 41, the energy storage unit 42 and the dc bus connected thereto, and the control subsystem 200 may implement that a corresponding power supply is connected to a corresponding power supply dc bus by controlling on and off of the eighth switch K8 and the ninth switch K9.
Specifically, referring to fig. 1 and 2, the power supply scheme of the power supply system 100 includes:
the first scheme is as follows: in the normal operation process of the power supply system 100, the control subsystem 200 may preferentially control the photovoltaic unit 41 to supply power to the corresponding power supply sub-section, and at this time, the control subsystem 200 may control the energy storage unit 42 to charge. When the photovoltaic unit 41 cannot meet the power supply requirement, the control subsystem 200 can control the energy storage unit 42 to be changed from a charging state to a discharging state, and the photovoltaic unit 41 and the energy storage unit 42 supply power simultaneously until the photovoltaic unit 41 quits operation and the energy storage unit 42 supplies power independently, so that the station can operate normally.
Scheme II: when neither the photovoltaic unit 41 nor the energy storage unit 42 of the power supply sub-zone can meet the power supply requirement, the control subsystem 200 may control the second switch unit connected to the power supply sub-zone to be closed (e.g., control the left-side K1, K2(K1 not shown) to be closed, or control the right-side K1, K2(K2 not shown) to be closed), so as to supply power through the photovoltaic unit and/or the energy storage unit of the adjacent power supply sub-zone.
The third scheme is as follows: when the photovoltaic unit 41 and the energy storage unit 42 in each power supply sub-interval cannot meet the power supply requirement, and the two adjacent power supply sub-intervals cannot meet the power supply requirement, the control subsystem 200 may control the second switch unit between the power supply sub-intervals in the power supply interval to be turned on, control the third switch K3 and the fourth switch K4 to be turned on, and control the AC/DC converter 12 to convert current, so as to introduce the utility power into the DC ring network 20 to supply power to the power supply sub-intervals, and at this time, the first switch unit between the power supply intervals is in the off state. In the process of supplying the commercial power, the eighth switches K8 in the power supply interval can be controlled to be opened, the ninth switches K9 can be controlled to be closed, and the energy storage units 42 can be controlled to be charged.
And the scheme is as follows: when the electric power substation in a certain power supply interval cannot introduce the commercial power to the dc ring network and the dc power supply in each power supply sub-interval cannot supply power, the control subsystem 200 may control the first switch unit connected to the power supply interval to be turned on, and control the dc power supply or the electric power substation in the adjacent power supply interval to supply power to the power supply interval. When power supply is realized through adjacent power supply intervals, the direct-current power supply is preferentially controlled to supply power, and when the direct-current power supply cannot be met, the substation 20 is controlled to introduce commercial power supply
Correspondingly, when the photovoltaic unit 41 in the power supply sub-section fails, the control subsystem 200 can preferentially control the energy storage unit 42 to supply power, and then can sequentially adopt the power supply modes in the second scheme and the third scheme until the failure is relieved and the normal operation mode is recovered; when both the photovoltaic unit 41 and the energy storage unit 42 have faults, the power supply modes in the second scheme and the third scheme can be adopted in sequence until the faults are removed, and the normal operation mode is recovered.
And a fifth scheme: when the direct current ring network 20 has a fault and the photovoltaic units cannot meet the power supply requirement, the control subsystem 200 controls the K1, the K2, the K3, the K4 and the K8 to be in an off state, cuts off unimportant loads of a station, controls the K9 to be closed, and uses the energy storage unit 42 as a standby power supply to supply power to the station until the line fault is eliminated and the normal power supply is recovered.
In each scheme, when a line or load in the power supply and distribution station 30 in the station fails, a fault part is disconnected (for example, when the line in the power distribution station 30 fails, the control subsystem 200 controls the K5 and the K6 to be disconnected; when the dynamic illumination fails, the control subsystem 200 controls the switch K7 corresponding to the dynamic illumination to be disconnected), and the rest normal lines are kept running until the fault is eliminated, and the power supply of the fault part is recovered.
Optionally, the control subsystem 200 may also preferentially control the substation 10 to introduce the commercial power to supply power for the power supply interval, at this time, each second switch unit is closed, and in this process, if there is an energy storage unit that is not fully charged, the energy storage unit 42 that is not fully charged may also be controlled to be charged. When the power supply of the substation 10 is abnormal, at least one of the switches K3 and K4 can be controlled to be turned off, and each second switch unit can be controlled to be turned off, so that the power supply of the direct current power supply in each power supply sub-interval is controlled.
In addition, according to an embodiment of the present invention, at least one charging station exists in the plurality of stations, as shown in fig. 1, fig. 2, and fig. 3, the dc load of the charging station includes a charging circuit 51 and a current provider 52, one end of the charging circuit 51 is connected to a station dc bus (see fig. 2) or a low voltage dc bus (see fig. 1 and fig. 3) of the corresponding charging station, and the other end of the charging circuit 51 is connected to the current provider 52; the control subsystem 200 is further configured to control the charging circuit 51 to charge the rail vehicle when the rail vehicle stops at the charging station and the charging port of the rail vehicle is connected to the current provider 52, so as to ensure normal operation of the rail vehicle and prolong the operation time of the rail vehicle.
The structure, shape, etc. of the current provider 52 may be set according to the actual charging requirement, for example, the current provider 52 may be a charging bow, a charging slot, a charging rail, etc., and this is not limited herein.
It should be noted that all rail vehicles can enter a station with a charging station, but not all rail vehicles need to be charged, and in this embodiment, the control subsystem 200 can acquire the electric quantity state and the power consumption state of the rail vehicles, so as to control whether the charging circuit 51 charges the rail vehicles.
In summary, the rail transit power supply system of the invention can realize power supply diversity and better ensure power supply reliability by setting the substation, the direct current ring network, the direct current power supply and the power supply partition; meanwhile, a large number of middle current transformation links are omitted, the number and the size of equipment are greatly reduced, equipment investment is reduced, a plurality of factors such as the frequency, the power factor, harmonic waves and line impedance of a system do not need to be considered, a large number of inverters are not needed, electric energy loss in the electric energy conversion process can be reduced, and the electric energy utilization efficiency is improved. In addition, only the direct current load is supplied with power, so that the power supply and distribution control is simpler and more convenient.
Further, the present invention provides a control method of a rail transit power supply system, which is used for controlling the rail transit power supply system 100 in the above embodiment.
Fig. 4 is a flowchart of a control method of a rail transit power supply system according to an embodiment of the present invention.
As shown in fig. 4, the control method of the rail transit power supply system includes the following steps:
s1, it is detected whether the power supply system is abnormal.
Wherein the power supply system abnormality may include: the direct current power supply can not supply power for the power supply sub-interval where the direct current power supply is located, such as insufficient electric energy, abnormal heating and the like; transmission line faults, such as distribution line faults for distribution substations, etc.; a dc load fault. Of course, the power supply system abnormality is not limited thereto.
And S2, if the power supply system is not abnormal, controlling the first switch unit and the second switch unit to be in an off state, and controlling all the direct current power supplies to supply power to the stations of the power supply sub-sections where the direct current power supplies are located.
Specifically, when the power supply system is not abnormal, each power supply sub-section can supply power by itself, that is, all the dc power supplies can supply power to the station in the power supply sub-section where the dc power supply is located, and at this time, each power supply section and each power supply sub-section do not need to be communicated with each other.
S3, in the process of supplying power to the direct current power supply, if there is a direct current power supply which can not meet the power supply requirement or has a fault, controlling at least one second switch unit connected with the passive power supply subinterval or the fault power supply subinterval to be closed so that the direct current power supply of the adjacent power supply subinterval of the passive power supply subinterval or the fault power supply subinterval supplies power to the station of the passive power supply subinterval or the fault power supply subinterval, wherein the passive power supply subinterval is the power supply subinterval where the direct current power supply which can not meet the power supply requirement is located, and the fault power supply subinterval is the power supply subinterval where the direct current power supply which has the fault is located.
Specifically, when the electric quantity stored in the dc power supply is insufficient or the dc power supply fails to work normally, and thus the corresponding power supply subinterval cannot supply power normally by itself, the dc power supply in the adjacent power supply subinterval may supply power to the power supply subinterval that cannot supply power normally, so as to maintain that the power supply subinterval can supply power to the station normally.
For example, for the power supply sub-sections A, B, C that are sequentially arranged, when the dc power supply in the middle power supply sub-section B cannot normally operate, the dc power supply in the adjacent power supply sub-section a and/or power supply sub-section C may be connected, so that the dc power supply in the power supply sub-section a and/or power supply sub-section C is used to supply power to the power supply sub-section B, and the station corresponding to the power supply sub-section B can normally operate. The power supply sub-interval B can be connected with the power supply sub-interval A and/or the power supply sub-interval C by closing the corresponding second switch unit.
And S4, if the direct current power supply of the passive power supply subinterval or the adjacent power supply subinterval of the fault power supply subinterval cannot meet the power supply requirement, controlling all second switch units of the power supply interval where the passive power supply subinterval or the fault power supply subinterval is located to be closed, and controlling the substation of the power supply interval to work so as to supply power to the station of the power supply interval through the commercial power.
Specifically, when the power supply subinterval A and the power supply subinterval C can not provide the power supply demand for the power supply subinterval B that breaks down, all second switch units are controlled to be closed, all power supply subintervals in the power supply interval are connected soon, and the work of the power substation in the power supply interval is controlled, insert the commercial power to power supply system through the power substation, in order to guarantee that the power supply subinterval B can normally operate, and therefore the power supply subinterval B can supply power for the station that corresponds to it, and guarantee that the vehicle can normally operate.
Therefore, the control method of the rail transit power supply system provided by the embodiment of the invention can realize various power supply schemes, and further can ensure the reliability of power supply.
According to an embodiment of the invention, the control method of the rail transit power supply system further comprises: in the process of supplying the mains supply, if a mains supply inlet line or a substation breaks down, at least one first switch unit connected with a power supply section where the substation is located is controlled to be closed, so that a power supply source of a power supply section adjacent to the power supply section where the substation is located supplies power to the power supply section where the substation is located through a direct current ring network.
Specifically, in a state where the utility power is supplied to the power supply sub-section, if the utility power is failed in the power supply incoming line or the power substation, the power supply section corresponding to the power substation cannot work, at this time, the power supply section adjacent to the power supply section where the power substation is located can be controlled to supply power to the power supply section where the power substation is located through the dc ring network, so that the power supply section where the power substation is located can normally supply power to the station. The adjacent power supply intervals can be connected through the first switch unit, and when the adjacent power supply intervals are required to be connected, the first switch unit is controlled to be closed.
Optionally, the control method may determine the number of closed first switch units according to parameters such as power consumption and remaining power in the power supply interval, and perform corresponding control.
According to an embodiment of the present invention, the dc power supply includes a photovoltaic unit and an energy storage unit, the dc load includes at least a first type of load and a second type of load, the importance level of the first type of load is higher than that of the second type of load, and the control method further includes: if the direct current ring network breaks down and the photovoltaic unit cannot meet the power supply requirement, the second switch unit connected with the power supply sub-interval where the direct current power supply is located is controlled to be disconnected, the second type of load of a station of the power supply sub-interval where the direct current power supply is located is cut off, and the energy storage unit is controlled to supply power for the first type of load of the station of the power supply sub-interval where the direct current power supply is located.
Specifically, when the power supply section cannot supply power to two types of loads at the same time, the first type of load with high priority or high importance level is preferentially supplied with power. For example, if the direct current looped network breaks down and the photovoltaic unit cannot meet the power supply requirement, the adjacent power supply sub-sections cannot supply power for the power supply sub-section, at the moment, the second switch units connected with the power supply sub-section are controlled to be in an off state, meanwhile, the second type of load of the power supply sub-section is cut off, the energy storage unit is controlled to supply power for the first type of load, so that the first type of load can normally run, and the normal power supply is recovered until the fault is eliminated.
According to an embodiment of the invention, the control method of the rail transit power supply system further comprises: if the power supply and distribution station has a fault, controlling a loop where the power supply and distribution station with the fault is located to be disconnected; and if the direct current load has a fault, controlling a loop in which the direct current load with the fault is located to be disconnected.
Specifically, in this embodiment, the power supply sub-section can be ensured to normally supply power to the station by combining the dc power supply, the dc power supply of the adjacent power supply sub-section, and the substation, and certainly, the other parts except the fault part can be ensured to normally operate by disconnecting the loop, and if the power supply and distribution station has a fault, the loop where the power supply and distribution station having the fault is located is controlled to be disconnected; and if the direct current load has a fault, controlling a loop where the direct current load with the fault is located to be disconnected, and restoring the electrification of the fault part until the fault is eliminated.
In summary, the control method of the rail transit power supply system according to the embodiment of the present invention is based on the control of the rail transit power supply system according to the above-mentioned embodiment, can implement multiple power supply schemes, and further can ensure the reliability of power supply, and has the advantages of low voltage level, small number of required devices, small occupied space of devices, less investment, and high power utilization rate.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The rail transit power supply system is characterized by comprising a control subsystem and a plurality of power supply intervals, wherein each power supply interval is used for supplying power to a plurality of stations, two adjacent power supply intervals are connected through a first switch unit, and each power supply interval comprises:
the input end of the substation is connected with a mains supply inlet wire, and the substation is used for carrying out voltage reduction treatment on alternating-current mains supply and converting alternating current after voltage reduction treatment into direct current;
the direct current ring network is connected with the output end of the substation and comprises station direct current buses arranged at each station and a first switch unit connected between the station direct current buses of two adjacent stations;
the power supply and distribution station comprises a low-voltage direct-current bus and a voltage conversion unit, wherein the voltage conversion unit is connected between the low-voltage direct-current bus and a station direct-current bus of a corresponding station, and the low-voltage direct-current bus is used for connecting a direct-current load of the corresponding station; and
each direct current power supply corresponds to one power supply sub-interval and is used for supplying power to at least one station, two adjacent power supply sub-intervals are connected through a second switch unit, and the direct current power supply is connected with a station direct current bus and/or a low-voltage direct current bus of the station where the direct current power supply is located;
the control subsystem is configured to acquire a working state of the power supply system, and control at least one of the first switch unit, the substation, the voltage conversion unit, the dc power supply, and the second switch unit according to the working state.
2. The rail transit power supply system according to claim 1, wherein the substation comprises a transformer and an AC/DC converter, a high-voltage end of the transformer is connected to the mains inlet line through a high-voltage AC bus, a low-voltage end of the transformer is connected to an AC end of the AC/DC converter, and a DC end of the AC/DC converter is connected to a station DC bus at a station of the substation.
3. The rail transit power supply system according to claim 2, wherein the voltage conversion unit includes a DC/DC converter, a first DC terminal of the DC/DC converter is connected to a station DC bus of a corresponding station, and a second DC terminal of the DC/DC converter is connected to a low voltage DC bus of the corresponding station.
4. The rail transit power supply system of claim 1, wherein the dc power supply comprises:
the photovoltaic unit is connected with a station direct current bus or a low-voltage direct current bus of a station where the photovoltaic unit is located;
and the energy storage unit is connected with a station direct current bus or a low-voltage direct current bus of a station where the energy storage unit is located.
5. The rail transit power supply system according to claim 1, wherein at least one charging station exists in the plurality of stations, the dc load of the charging station includes a charging circuit and a current supplier, one end of the charging circuit is connected to a station dc bus or a low voltage dc bus of the corresponding charging station, and the other end of the charging circuit is connected to the current supplier;
the control subsystem is further used for controlling the charging circuit to charge the rail vehicle when the rail vehicle stops at a charging station and a charging port of the rail vehicle is connected with the current provider.
6. The rail transit power supply system according to claim 3, wherein the first switch unit comprises a first switch and a second switch, and the first switch, the direct current cable and the second switch are connected in sequence between station direct current buses of adjacent stations;
the power substation further comprises a third switch, and the third switch is connected between the direct-current end of the AC/DC converter and a station direct-current bus of a station where the power substation is located;
the voltage conversion unit further comprises a fourth switch and a fifth switch, the fourth switch is connected between the first direct current end of the DC/DC converter and a station direct current bus of a corresponding station, and the fifth switch is connected between the second direct current end of the DC/DC converter and a low-voltage direct current bus of the corresponding station;
and a sixth switch is connected between the direct current load and the corresponding low-voltage direct current bus.
7. A control method of a rail transit power supply system, the control method being used for controlling the rail transit power supply system according to any one of claims 1 to 6, the control method comprising the steps of:
detecting whether the power supply system is abnormal;
if the power supply system is not abnormal, controlling the first switch unit and the second switch unit to be in a disconnected state, and controlling all direct-current power supplies to supply power to stations in power supply sub intervals where the direct-current power supplies are located;
in the process of supplying power by a direct current power supply, if a direct current power supply which cannot meet the power supply requirement or has a fault exists, controlling at least one second switch unit connected with a passive power supply subinterval or a fault power supply subinterval to be closed so that the direct current power supply of the passive power supply subinterval or the adjacent power supply subinterval of the fault power supply subinterval supplies power to a station of the passive power supply subinterval or the fault power supply subinterval, wherein the passive power supply subinterval is the power supply subinterval where the direct current power supply which cannot meet the power supply requirement exists, and the fault power supply subinterval is the power supply subinterval where the direct current power supply with the fault exists;
and if the direct-current power supply of the passive power supply subinterval or the adjacent power supply subinterval of the fault power supply subinterval cannot meet the power supply requirement, controlling all second switch units of the power supply interval where the passive power supply subinterval or the fault power supply subinterval is positioned to be closed, and controlling the substation of the power supply interval to work so as to supply power to the stations of the power supply interval through the commercial power.
8. The control method of the rail transit power supply system according to claim 7, further comprising:
in the process of supplying power to the commercial power, if the commercial power is in line or the substation breaks down, controlling at least one first switch unit connected with the power supply section where the substation is located to be closed, so that a power supply source of a power supply section adjacent to the power supply section where the substation is located supplies power to the power supply section where the substation is located through the direct current ring network.
9. The method for controlling a rail transit power supply system according to claim 7, wherein the dc power source includes a photovoltaic unit and an energy storage unit, the dc loads include at least a first type of load and a second type of load, and the importance level of the first type of load is higher than that of the second type of load, and the method further comprises:
if the direct current looped network breaks down, and when the photovoltaic unit can not meet the power supply requirement, the second switch unit connected with the power supply subinterval where the direct current power supply is located is controlled to be disconnected, the second type load of at least one station in the power supply subinterval where the direct current power supply is located is cut off, and the energy storage unit is controlled to supply power to the station in the power supply subinterval where the direct current power supply is located.
10. The control method of the rail transit power supply system according to claim 7, further comprising:
if the power supply and distribution station has a fault, controlling a loop where the power supply and distribution station with the fault is located to be disconnected;
and if the direct current load has a fault, controlling a loop in which the direct current load with the fault is located to be disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010231332.6A CN113442798B (en) | 2020-03-27 | 2020-03-27 | Rail transit power supply system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010231332.6A CN113442798B (en) | 2020-03-27 | 2020-03-27 | Rail transit power supply system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113442798A true CN113442798A (en) | 2021-09-28 |
| CN113442798B CN113442798B (en) | 2023-05-05 |
Family
ID=77807958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010231332.6A Active CN113442798B (en) | 2020-03-27 | 2020-03-27 | Rail transit power supply system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113442798B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014061868A (en) * | 2013-03-08 | 2014-04-10 | Meidensha Corp | Control device and control method of dc feeding substation |
| CN105398353A (en) * | 2015-10-23 | 2016-03-16 | 惠州市亿能电子有限公司 | Electric source system of track traffic locomotive and control method of electric source system |
| CN106301203A (en) * | 2015-05-25 | 2017-01-04 | 上海凯盾工程技术有限公司 | Solar energy power generating accesses the method for magnetic floating traffic electric power system |
| CN107342605A (en) * | 2017-05-15 | 2017-11-10 | 北京北交新能科技有限公司 | A kind of ground integrated energy corollary system of track traffic vehicle |
| CN207128666U (en) * | 2017-06-09 | 2018-03-23 | 中铁二院工程集团有限责任公司 | A kind of urban track traffic three Phase Inverter Device |
| CN208522467U (en) * | 2018-07-27 | 2019-02-19 | 比亚迪股份有限公司 | The urban transportation |
-
2020
- 2020-03-27 CN CN202010231332.6A patent/CN113442798B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014061868A (en) * | 2013-03-08 | 2014-04-10 | Meidensha Corp | Control device and control method of dc feeding substation |
| CN106301203A (en) * | 2015-05-25 | 2017-01-04 | 上海凯盾工程技术有限公司 | Solar energy power generating accesses the method for magnetic floating traffic electric power system |
| CN105398353A (en) * | 2015-10-23 | 2016-03-16 | 惠州市亿能电子有限公司 | Electric source system of track traffic locomotive and control method of electric source system |
| CN107342605A (en) * | 2017-05-15 | 2017-11-10 | 北京北交新能科技有限公司 | A kind of ground integrated energy corollary system of track traffic vehicle |
| CN207128666U (en) * | 2017-06-09 | 2018-03-23 | 中铁二院工程集团有限责任公司 | A kind of urban track traffic three Phase Inverter Device |
| CN208522467U (en) * | 2018-07-27 | 2019-02-19 | 比亚迪股份有限公司 | The urban transportation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113442798B (en) | 2023-05-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109066686B (en) | Flexible switch station interconnection structure with comprehensive distribution of various electric energy | |
| US11532947B2 (en) | Combination wind/solar DC power system | |
| CN110040039B (en) | Alternating-current traction power supply system and method for photovoltaic energy storage distributed power generation | |
| CN105308824A (en) | Energy storage device having a dc voltage supply circuit and method for providing a dc voltage from an energy storage device | |
| CN108183545B (en) | Multi-energy micro-grid power supply system for data center | |
| CN101572429B (en) | UPS system | |
| CN212796591U (en) | Rail transit power supply system | |
| CN110605979A (en) | New energy automobile high-voltage electrical system | |
| CN210706914U (en) | New energy automobile high-voltage electrical system | |
| CN112510815A (en) | Active isolation type single-phase high-quality power supply system | |
| CN204559131U (en) | Be connected to the transformer and distribution power station of energy-storage system | |
| CN110867946A (en) | Alternating current-direct current hybrid power supply integrated power supply | |
| CN113442798B (en) | Rail transit power supply system and control method thereof | |
| CN113452010B (en) | Rail transit power supply system and control method thereof | |
| CN104821594A (en) | Transformation and distribution station connected with energy storage system | |
| CN215772577U (en) | Power supply system | |
| CN212796592U (en) | Rail transit power supply system | |
| CN110504670B (en) | Power supply system and power supply method of direct-current power distribution network | |
| CN105529746B (en) | A kind of flexibility distribution system | |
| CN211969228U (en) | Rail transit power supply system | |
| CN213007710U (en) | Rail transit power supply system | |
| CN110932333A (en) | Power distribution system | |
| CN216959346U (en) | Alternating current-direct current microgrid router system for comprehensive energy station | |
| CN218005970U (en) | Energy storage system and equipment | |
| CN220234208U (en) | AC/DC double bus power exchange station |
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 |