CN109484199B - Power supply structure and method for regenerating braking energy by utilizing electrified railway - Google Patents

Power supply structure and method for regenerating braking energy by utilizing electrified railway Download PDF

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CN109484199B
CN109484199B CN201811569751.XA CN201811569751A CN109484199B CN 109484199 B CN109484199 B CN 109484199B CN 201811569751 A CN201811569751 A CN 201811569751A CN 109484199 B CN109484199 B CN 109484199B
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CN109484199A (en
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黄小红
李群湛
唐思达
廖勤宇
杨乃琪
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Southwest Jiaotong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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Abstract

The invention provides a power supply structure utilizing regenerative braking energy of an electrified railway and a method thereof, and relates to the technical field of energy conservation of electrified railways. The direct current sides of the two sets of three-phase alternating-current and direct-current conversion systems are connected back to back, the public end of the direct current side is connected with an energy accumulator through a DC/DC converter, and the alternating current side is respectively connected to the traction bus side of the traction substation and the 10kV three-phase low-voltage distribution bus side of the station. The coordination controller acquires voltage and current signals of a traction arm of the traction substation and the charge state of the energy accumulator, and performs power exchange on the coordination control three-phase direct current system and the DC/DC converter to realize conversion from the regenerative braking energy of the train to the station low-voltage distribution system and store the residual regenerative braking energy after conversion into the energy accumulator. The invention has simple and reliable structure and control method, and is easy to implement.

Description

Power supply structure and method for regenerating braking energy by utilizing electrified railway
Technical Field
The invention relates to the technical field of energy conservation of electrified railways, in particular to regeneration braking energy utilization of electrified railways.
Background
The electric locomotive of the electrified railway can generate great regenerative braking energy in the braking process, and if other electric locomotives in the same power supply arm are in a traction state, the regenerative braking energy can be absorbed, so that the energy conservation and emission reduction are facilitated. However, because the length of the power supply arm is limited, the train in regenerative braking and traction is often in different power supply arms, and in addition, the concurrency and power consistency of traction and regenerative braking are poor, so that the regenerative braking energy cannot be fully utilized.
The in-phase power supply technology cancels the phase separation of the electricity of the traction substation, prolongs the length of a power supply arm, and is beneficial to the utilization of regenerative braking energy. However, when the total regenerative braking energy in the power supply arm is greater than the traction energy, the regenerative braking energy cannot be fully utilized, or the driving density is low, and when the trains in traction and regenerative braking conditions in the same power supply arm cannot simultaneously appear, the regenerative braking energy cannot be utilized.
Energy storage technology is another approach to improving regenerative braking energy utilization. The energy storage devices are respectively arranged on the left power supply arm and the right power supply arm of the traction substation, so that the regenerated energy of the train is recovered and utilized during the traction of the train; or, by referring to the technology of the RPC of the railway power regulator in Japan, an energy storage device is arranged on the direct current side of the RPC, so that the regeneration braking energy is transferred between the left power supply arm and the right power supply arm, and the rest regeneration braking energy after the transfer is stored. However, when the regenerated energy of the traction substation is large, the requirements on the power and the energy density of the energy storage device are high, and the investment is large. The device footprint is also limited for existing wires.
Some large-scale stations, such as Shanghai stations, the train is frequent, and the regeneration braking energy is great, and the low voltage distribution equipment power consumption is also more in the station simultaneously. The regenerative braking energy of the train is converted into electricity for equipment in the station, and the rest energy is stored again, so that the effect of achieving two purposes is achieved, the regenerative braking energy is fully utilized, and the capacity of the energy storage device is saved. In view of this, it is particularly necessary to develop the utilization of regenerative braking energy of an electrified railway.
Disclosure of Invention
The invention aims to provide a power supply structure and a method for regenerating braking energy by utilizing an electrified railway, which can effectively solve the technical problems of storage and effective utilization of the regenerative braking energy of a train.
The invention adopts the following technical scheme to realize the purpose: the utility model provides a power supply structure of utilization electric railway regeneration braking energy, including traction substation traction busbar TBa, traction busbar TBb, rail R, station 10kV distribution busbar RDB, three-phase AC-DC converter COa, three-phase AC-DC converter COb, DC/DC converter DDC, energy storage SD, the direct current side DCLa of three-phase AC-DC converter COa links to each other with the direct current side DCLb of three-phase AC-DC converter COb, constitutes back-to-back structure, its direct current side common terminal connects to energy storage SD through DC/DC converter DDC; the three-phase terminals of the alternating current side of the three-phase alternating current converter COa are respectively connected to a traction busbar TBa through a cable CAx, a traction busbar TBb through a cable CAy and a steel rail R through a cable CAz; the alternating-current side three-phase terminals of the three-phase alternating-current direct-current converter COb are respectively connected to a phase, b phase and c phase of the station 10kV distribution bus RDB through three-phase cables; the coordination controller CC is provided with five input ends In1 to In5 and three output ends Out1 to Out3, wherein the input end In1 is connected to the secondary side of the voltage transformer PTa of the traction busbar TBa, the input end In2 is connected to the secondary side of the current transformer CTa of the traction feeder TFa, the input end In3 is connected to the secondary side of the voltage transformer CTb of the traction busbar TBb, the input end In4 is connected to the secondary side of the current transformer CTb of the traction feeder TFb, the input end In5 is connected to the state-of-charge output end of the energy storage SD, the output end Out1 is connected to the control end of the three-phase alternating-current/direct-current converter COa, the output end Out2 is connected to the control end of the three-phase alternating-current/direct-current converter COb, and the output end Out3 is connected to the control end of the DC/DC converter DDC.
When the traction feeder TFa has n parallel paths, the number of the current transformers CTa is n, and the input end In2 is set to be n paths and is respectively connected to the secondary sides of the n current transformers CTa; when the traction feeder TFb has n parallel paths, the number of the current transformers CTb is n, and the input end In4 is set to be n paths and is respectively connected to the secondary sides of the n current transformers CTb, wherein n is more than or equal to 2.
Rated power P of the three-phase AC-DC converter COa E Rated power P of three-phase AC/DC converter COb D Rated power P of DC/DC converter DDC S Rated power P of accumulator SD B The relationship between them satisfies: p (P) E ≥P D ≥P S ，
Figure BDA0001915194410000021
Figure BDA0001915194410000022
P S ＝P B 。
Control method of power supply structure by utilizing electrified railway regenerated braking energy, and coordination controller CC obtains real-time power of traction bus TBa through input ends In1 and In2 and records as p a Real-time power of the traction bus TBb is obtained through input ends In3 and In4 and is recorded as p b Acquiring a state of charge (SOC) sign of an energy Storage Device (SD) through In5, and recording real-time running power of a three-phase alternating-current/direct-current (COa) system as p e The real-time running power of the COb of the three-phase alternating-current and direct-current system is p d And the real-time operation power of the DDC of the DC/DC converter is p s According to p a 、p b And SOC value real-time control p e 、p d 、p s The three power exchanges realize the conversion, storage and utilization of the regenerative braking energy of the electrified railway, and the specific steps are as follows:
1) When p is a +p b Not less than 0, no regenerated braking energy exists in the traction substation, and the coordination controller CC controls the discharge of the energy storage SD; namely, the three-phase direct current converter COa is controlled to be in a standby state, the DC/DC converter DDC is controlled to implement the discharge of the energy storage SD, and the three-phase direct current converter COb is controlled to transmit power to the 10kV distribution bus RDB of the station, wherein the power requirement of the three-phase direct current converter COa is satisfied: (1) p is p e =0; (2) when SOC is>At SOC_lower, p d ＝P S When SOC is less than or equal to SOC_lower, p d =0; (3) when SOC is>At SOC_lower, p s ＝P S When SOC is less than or equal to SOC_lower, p s =0, wherein soc_lower is a lower limit value of discharge of the accumulator SD, determined by the operating state of the accumulator SD;
2) when-P D ≤p a +p b <0, traction transformation all regenerative braking energy, a coordination controller CC controls a traction bus at one side with high regenerative braking power to transfer the regenerative braking energy to a station 10kV distribution bus RDB, and the coordination controller SD is used for discharging; that is, the three-phase DC/AC system COa is controlled to operate in a two-phase operation mode when p a ≥p b In this case, power is transmitted to the dc side DCLa through the cable CAy and the cable CAz, and when p a <p b During the time, power is transmitted to the DC side DCLa through the cable CAx and the cable CAz, the DC/DC converter DDC is controlled to implement the SD discharge of the energy storage, the three-phase direct current converter COb is controlled to transmit power to the station 10kV distribution bus RDB, and the power requirement of the three-phase direct current converter COb is satisfied: (1) p is p e ＝|p a +p b I (I); (2) when SOC is>At SOC_lower, p d ＝P D When SOC is less than or equal to SOC_lAt the time of ower, p d ＝|p a +p b I (I); (3) when SOC is>At SOC_lower, p s ＝P D -|p a +p b When SOC is less than or equal to SOC_lower, p s ＝0；
3) When p is a +p b <-P D All regenerative braking energy of the traction substation is transferred, a traction bus at one side with high regenerative braking power is controlled by a coordination controller CC to transfer the regenerative braking energy to a 10kV distribution bus RDB of a station, and the residual energy is stored by a coordination control energy storage device SD; that is, the three-phase DC-to-DC converter COa is controlled to operate in the two-phase operation mode when p a ≥p b In this case, power is transmitted to the dc side DCLa through the cable CAy and the cable CAz, and when p a <p b During the time, through cable CAx and cable CAz to direct current side DCLa transmission power, control DC/DC converter DDC implementation accumulator SD charges to control three crossing direct current converter COb carries power to station 10kV distribution busbar RDB, and its power requirement satisfies: (1) when SOC is larger than or equal to SOC_upper, p e ＝P D When SOC is<If SOC_upper
Figure BDA0001915194410000031
Then p is e ＝|p a +p b I, if->
Figure BDA0001915194410000032
Then->
Figure BDA0001915194410000033
②p d ＝P D The method comprises the steps of carrying out a first treatment on the surface of the (3) When SOC is larger than or equal to SOC_upper, p s When SOC is equal to =0<In the case of SOC_lower, if +.>
Figure BDA0001915194410000034
Then p is s ＝|p a +p b |-P D If->
Figure BDA0001915194410000035
Then p is s ＝P S The method comprises the steps of carrying out a first treatment on the surface of the The soc_upper is an upper limit value of the charge of the accumulator SD, and is determined by the operating state of the accumulator SD. />
The working principle of the invention is as follows: the real-time power of the traction substation is detected, the regenerative braking power of the two traction power supply arms is judged, the traction bus side three-phase direct current transformer is used for running in a two-phase mode, the 10kV power distribution bus side three-phase direct current transformer is used for running in a three-phase mode, the regenerative braking energy of the power supply arm with high regenerative braking power is transferred to the 10kV power distribution bus of the station, and the rest regenerative braking energy after transfer is stored in the energy accumulator. And the energy accumulator is subjected to real-time charge and discharge control, so that the utilization rate of the energy accumulator is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention transfers the regenerative braking energy of the electrified railway train to the station low-voltage distribution system, thereby being beneficial to improving the utilization rate of the regenerative braking energy and effectively saving the capacity of the energy storage device.
2. The power supply structure and the control method adopted by the invention can save the capacity of the power switch tube of the converter.
3. The invention is simple and reliable and is easy to implement.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description. The utility model provides a power supply structure of utilization electric railway regeneration braking energy, including traction substation traction busbar TBa, traction busbar TBb, rail R, station 10kV distribution busbar RDB, three-phase AC-DC converter COa, three-phase AC-DC converter COb, DC/DC converter DDC, energy storage SD, the direct current side DCLa of three-phase AC-DC converter COa links to each other with the direct current side DCLb of three-phase AC-DC converter COb, constitutes back-to-back structure, its direct current side common terminal connects to energy storage SD through DC/DC converter DDC; the three-phase terminals of the alternating current side of the three-phase alternating current converter COa are respectively connected to a traction busbar TBa through a cable CAx, a traction busbar TBb through a cable CAy and a steel rail R through a cable CAz; the alternating-current side three-phase terminals of the three-phase alternating-current direct-current converter COb are respectively connected to a phase, b phase and c phase of the station 10kV distribution bus RDB through three-phase cables; the coordination controller CC is provided with five input ends In1 to In5 and three output ends Out1 to Out3, wherein the input end In1 is connected to the secondary side of the voltage transformer PTa of the traction busbar TBa, the input end In2 is connected to the secondary side of the current transformer CTa of the traction feeder TFa, the input end In3 is connected to the secondary side of the voltage transformer CTb of the traction busbar TBb, the input end In4 is connected to the secondary side of the current transformer CTb of the traction feeder TFb, the input end In5 is connected to the state-of-charge output end of the energy storage SD, the output end Out1 is connected to the control end of the three-phase alternating-current/direct-current converter COa, the output end Out2 is connected to the control end of the three-phase alternating-current/direct-current converter COb, and the output end Out3 is connected to the control end of the DC/DC converter DDC.
When the traction feeder TFa has n parallel paths, the number of the current transformers CTa is n, and the input end In2 is set to be n paths and is respectively connected to the secondary sides of the n current transformers CTa; when the traction feeder TFb has n parallel paths, the number of the current transformers CTb is n, and the input end In4 is set to be n paths and is respectively connected to the secondary sides of the n current transformers CTb, wherein n is more than or equal to 2.
Rated power P of the three-phase AC-DC converter COa E Rated power P of three-phase AC/DC converter COb D Rated power P of DC/DC converter DDC S Rated power P of accumulator SD B The relationship between them satisfies: p (P) E ≥P D ≥P S ，
Figure BDA0001915194410000041
Figure BDA0001915194410000042
P S ＝P B 。
Control method of power supply structure by utilizing electrified railway regenerated braking energy, and coordination controller CC obtains real-time power of traction bus TBa through input ends In1 and In2 and records as p a Real-time power of the traction bus TBb is obtained through input ends In3 and In4 and is recorded as p b Acquiring a state of charge (SOC) sign of an energy Storage Device (SD) through In5, and recording real-time running power of a three-phase alternating-current/direct-current (COa) system as p e The real-time running power of the COb of the three-phase alternating-current and direct-current system is p d And the real-time operation power of the DDC of the DC/DC converter is p s Root of Chinese characterAccording to p a 、p b And SOC value real-time control p e 、p d 、p s The three power exchanges realize the conversion, storage and utilization of the regenerative braking energy of the electrified railway, and the specific steps are as follows:
1) When p is a +p b Not less than 0, no regenerated braking energy exists in the traction substation, and the coordination controller CC controls the discharge of the energy storage SD; namely, the three-phase direct current converter COa is controlled to be in a standby state, the DC/DC converter DDC is controlled to implement the discharge of the energy storage SD, and the three-phase direct current converter COb is controlled to transmit power to the 10kV distribution bus RDB of the station, wherein the power requirement of the three-phase direct current converter COa is satisfied: (1) p is p e =0; (2) when SOC is>At SOC_lower, p d ＝P S When SOC is less than or equal to SOC_lower, p d =0; (3) when SOC is>At SOC_lower, p s ＝P S When SOC is less than or equal to SOC_lower, p s =0, wherein soc_lower is a lower limit value of discharge of the accumulator SD, determined by the operating state of the accumulator SD;
2) when-P D ≤p a +p b <0, traction transformation all regenerative braking energy, a coordination controller CC controls a traction bus at one side with high regenerative braking power to transfer the regenerative braking energy to a station 10kV distribution bus RDB, and the coordination controller SD is used for discharging; that is, the three-phase DC/AC system COa is controlled to operate in a two-phase operation mode when p a ≥p b In this case, power is transmitted to the dc side DCLa through the cable CAy and the cable CAz, and when p a <p b During the time, power is transmitted to the DC side DCLa through the cable CAx and the cable CAz, the DC/DC converter DDC is controlled to implement the SD discharge of the energy storage, the three-phase direct current converter COb is controlled to transmit power to the station 10kV distribution bus RDB, and the power requirement of the three-phase direct current converter COb is satisfied: (1) p is p e ＝|p a +p b I (I); (2) when SOC is>At SOC_lower, p d ＝P D When SOC is less than or equal to SOC_lower, p d ＝|p a +p b I (I); (3) when SOC is>At SOC_lower, p s ＝P D -|p a +p b When SOC is less than or equal to SOC_lower, p s ＝0；
3) When p is a +p b <-P D All regenerative braking energy of traction substation and coordination controllerCC controls the traction bus at the side with high regenerative braking power to transfer the regenerative braking energy to the 10kV distribution bus RDB of the station, and coordinates and controls the energy accumulator SD to store the residual energy; that is, the three-phase DC-to-DC converter COa is controlled to operate in the two-phase operation mode when p a ≥p b In this case, power is transmitted to the dc side DCLa through the cable CAy and the cable CAz, and when p a <p b During the time, through cable CAx and cable CAz to direct current side DCLa transmission power, control DC/DC converter DDC implementation accumulator SD charges to control three crossing direct current converter COb carries power to station 10kV distribution busbar RDB, and its power requirement satisfies: (1) when SOC is larger than or equal to SOC_upper, p e ＝P D When SOC is<If SOC_upper
Figure BDA0001915194410000051
Then p is e ＝|p a +p b I, if->
Figure BDA0001915194410000052
Then->
Figure BDA0001915194410000053
②p d ＝P D The method comprises the steps of carrying out a first treatment on the surface of the (3) When SOC is larger than or equal to SOC_upper, p s When SOC is equal to =0<In the case of SOC_lower, if +.>
Figure BDA0001915194410000054
Then p is s ＝|p a +p b |-P D If->
Figure BDA0001915194410000055
Then p is s ＝P S The method comprises the steps of carrying out a first treatment on the surface of the The soc_upper is an upper limit value of the charge of the accumulator SD, and is determined by the operating state of the accumulator SD. />

Claims (4)

1. The utility model provides an utilize power supply structure of electric railway regeneration braking energy, includes traction substation traction busbar TBa, traction busbar TBb, rail R, station 10kV distribution busbar RDB, three-phase AC-DC converter COa, three-phase AC-DC converter COb, DC/DC converter DDC, accumulator SD, its characterized in that: the DC side DCLa of the three-phase alternating-current/direct-current converter COa is connected with the DC side DCLb of the three-phase alternating-current/direct-current converter COb to form a back-to-back structure, and the common end of the DC side is connected to the energy accumulator SD through the DC/DC converter DDC; the three-phase terminals of the alternating current side of the three-phase alternating current converter COa are respectively connected to a traction busbar TBa through a cable CAx, a traction busbar TBb through a cable CAy and a steel rail R through a cable CAz; the alternating-current side three-phase terminals of the three-phase alternating-current direct-current converter COb are respectively connected to a phase, b phase and c phase of the station 10kV distribution bus RDB through three-phase cables; the coordination controller CC is provided with five input ends In1 to In5 and three output ends Out1 to Out3, wherein the input end In1 is connected to the secondary side of the voltage transformer PTa of the traction busbar TBa, the input end In2 is connected to the secondary side of the current transformer CTa of the traction feeder TFa, the input end In3 is connected to the secondary side of the voltage transformer CTb of the traction busbar TBb, the input end In4 is connected to the secondary side of the current transformer CTb of the traction feeder TFb, the input end In5 is connected to the state-of-charge output end of the energy storage SD, the output end Out1 is connected to the control end of the three-phase alternating-current/direct-current converter COa, the output end Out2 is connected to the control end of the three-phase alternating-current/direct-current converter COb, and the output end Out3 is connected to the control end of the DC/DC converter DDC.
2. The power supply structure utilizing regenerative braking energy of an electrified railway according to claim 1, wherein when the traction feeder TFa has n parallel paths, the number of the current transformers CTa is n, and the input end In2 is n paths and is connected to the secondary sides of the n current transformers CTa respectively; when the traction feeder TFb has n parallel paths, the number of the current transformers CTb is n, and the input end In4 is set to be n paths and is respectively connected to the secondary sides of the n current transformers CTb, wherein n is more than or equal to 2.
3. A power supply structure for regenerating braking energy by means of an electrified railway according to claim 1, wherein: rated power P of the three-phase AC-DC converter COa E Rated power P of three-phase AC/DC converter COb D Rated power P of DC/DC converter DDC S Rated power P of accumulator SD B The relationship between them satisfies: p (P) E ≥P D ≥P S ，
Figure FDA0001915194400000011
P S ＝P B 。
4. A control method of a power supply structure utilizing regenerative braking energy of an electrified railway is characterized in that: the coordination controller CC obtains the real-time power of the traction bus TBa through the input ends In1 and In2 and is recorded as p a Real-time power of the traction bus TBb is obtained through input ends In3 and In4 and is recorded as p b Acquiring a state of charge (SOC) sign of an energy Storage Device (SD) through In5, and recording real-time running power of a three-phase alternating-current/direct-current (COa) system as p e The real-time running power of the COb of the three-phase alternating-current and direct-current system is p d And the real-time operation power of the DDC of the DC/DC converter is p s According to p a 、p b And SOC value real-time control p e 、p d 、p s The three power exchanges realize the conversion, storage and utilization of the regenerative braking energy of the electrified railway, and the specific steps are as follows:
1) When p is a +p b Not less than 0, no regenerated braking energy exists in the traction substation, and the coordination controller CC controls the discharge of the energy storage SD; namely, the three-phase direct current converter COa is controlled to be in a standby state, the DC/DC converter DDC is controlled to implement the discharge of the energy storage SD, and the three-phase direct current converter COb is controlled to transmit power to the 10kV distribution bus RDB of the station, wherein the power requirement of the three-phase direct current converter COa is satisfied: (1) p is p e =0; (2) when SOC is>At SOC_lower, p d ＝P S When SOC is less than or equal to SOC_lower, p d =0; (3) when SOC is>At SOC_lower, p s ＝P S When SOC is less than or equal to SOC_lower, p s =0, wherein soc_lower is a lower limit value of discharge of the accumulator SD, determined by the operating state of the accumulator SD;
2) when-P D ≤p a +p b <0, traction transformation all regenerative braking energy, a coordination controller CC controls a traction bus at one side with high regenerative braking power to transfer the regenerative braking energy to a station 10kV distribution bus RDB, and the coordination controller SD is used for discharging; that is, the three-phase DC/AC system COa is controlled to operate in a two-phase operation mode when p a ≥p b In this case, power is transmitted to the dc side DCLa through the cable CAy and the cable CAz, and when p a <p b During the time, power is transmitted to the DC side DCLa through the cable CAx and the cable CAz, the DC/DC converter DDC is controlled to implement the SD discharge of the energy storage, the three-phase direct current converter COb is controlled to transmit power to the station 10kV distribution bus RDB, and the power requirement of the three-phase direct current converter COb is satisfied: (1) p is p e ＝|p a +p b I (I); (2) when SOC is>At SOC_lower, p d ＝P D When SOC is less than or equal to SOC_lower, p d ＝|p a +p b I (I); (3) when SOC is>At SOC_lower, p s ＝P D -|p a +p b When SOC is less than or equal to SOC_lower, p s ＝0；
3) When p is a +p b <-P D All regenerative braking energy of the traction substation is transferred, a traction bus at one side with high regenerative braking power is controlled by a coordination controller CC to transfer the regenerative braking energy to a 10kV distribution bus RDB of a station, and the residual energy is stored by a coordination control energy storage device SD; that is, the three-phase DC-to-DC converter COa is controlled to operate in the two-phase operation mode when p a ≥p b In this case, power is transmitted to the dc side DCLa through the cable CAy and the cable CAz, and when p a <p b During the time, through cable CAx and cable CAz to direct current side DCLa transmission power, control DC/DC converter DDC implementation accumulator SD charges to control three crossing direct current converter COb carries power to station 10kV distribution busbar RDB, and its power requirement satisfies: (1) when SOC is larger than or equal to SOC_upper, p e ＝P D When SOC is<If SOC_upper
Figure FDA0001915194400000021
Then p is e ＝|p a +p b I, if->
Figure FDA0001915194400000022
Then->
Figure FDA0001915194400000023
②p d ＝P D The method comprises the steps of carrying out a first treatment on the surface of the (3) When SOC is larger than or equal to SOC_upper, p s When SOC is equal to =0<If SOC_lower/>
Figure FDA0001915194400000024
Then p is s ＝|p a +p b |-P D If->
Figure FDA0001915194400000025
Then p is s ＝P S The method comprises the steps of carrying out a first treatment on the surface of the The soc_upper is an upper limit value of the charge of the accumulator SD, and is determined by the operating state of the accumulator SD. />
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