CN110611314A - Energy efficient utilization system for railway traction network - Google Patents
Energy efficient utilization system for railway traction network Download PDFInfo
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- CN110611314A CN110611314A CN201910809297.9A CN201910809297A CN110611314A CN 110611314 A CN110611314 A CN 110611314A CN 201910809297 A CN201910809297 A CN 201910809297A CN 110611314 A CN110611314 A CN 110611314A
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- power
- power supply
- supply arm
- traction
- energy storage
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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
- B60L7/14—Dynamic electric regenerative braking for vehicles propelled by ac motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
An energy efficient utilization system for a railroad traction network, comprising: the power adjusting device is connected with the two power supply arms of the traction substation and used for realizing power transfer between the two different power supply arms of the substation; and the energy storage device is used for storing the electric energy transmitted by the power regulating device from the power supply arm or transmitting the self-stored electric energy to the power regulating device so as to be transmitted to the power supply arm by the power regulating device. The system can greatly improve the utilization rate of the regenerative braking energy of the train, realize the active power transfer between the two power supply arms, and also realize the compensation of reactive power and the management of harmonic current, thereby improving the electric energy quality of the traction power supply system.
Description
Technical Field
The invention relates to the technical field of electrified railways, in particular to an energy efficient utilization system for a railway traction network, and particularly relates to an energy efficient utilization and power supply quality improving system for the railway traction network.
Background
The electrified railway in China adopts a single-phase 27.5kV/50Hz alternating current traction power supply mode, electric locomotives running on a railway trunk line mainly have models of HXD1, HXD2, HXD3 and the like, the train works through an alternating current-direct current transmission technology, the transmission technology can realize bidirectional energy flow, and conditions are created for realizing regenerative braking.
Regenerative braking is realized by controlling the current and direction of a train motor to enable a traction motor to be in a power generation state, and generating force opposite to the running direction of the train to consume the kinetic energy of the train, so as to achieve the effect of deceleration and realize braking, and is also called as dynamic braking in a habit.
When the train adopts regenerative braking, the energy-saving effect can be achieved, and the regenerative braking is more and more favored by research. At present, the high-speed train in China generally adopts a braking mode of mainly regenerative braking and assisting air braking. The railway installed power is large and the train density is high in China, the generated regenerative braking energy is huge, and the maximum capacity of the train can be achieved along with the change of the running speed, the installed power and the like of the train.
Disclosure of Invention
To solve the above problems, the present invention provides an energy efficient utilization system for a railway traction network, the system comprising:
the power adjusting device is connected with the two power supply arms of the traction substation and used for realizing power transfer between the two different power supply arms of the substation;
and the energy storage device is connected with the power regulating device and is used for storing the electric energy transmitted by the power regulating device from the power supply arm or transmitting the electric energy stored by the energy storage device to the power regulating device so as to be transmitted to the power supply arm by the power regulating device.
According to an embodiment of the present invention, the power adjusting apparatus includes:
the converter comprises a first converter and a second converter which are used for realizing direct current-alternating current conversion or alternating current-direct current conversion, wherein the first converter is connected with the second converter;
the alternating current side of the first converter is connected with a first power supply arm through the first connecting transformer or the first reactor;
and the alternating current of the second converter is connected with a second power supply arm through the second connecting transformer or the second reactor.
According to an embodiment of the invention, the first converter and the second converter share a dc-side capacitor to form a back-to-back structure.
According to an embodiment of the present invention, the power adjusting device is configured to adjust an operation state thereof according to the acquired first traction load power corresponding to the first power supply arm and the acquired second traction load power corresponding to the second power supply arm, so as to adjust a transfer state of the electric energy among the first power supply arm, the second power supply arm and the energy storage device.
According to an embodiment of the invention, if the sum of the first traction load power and the second traction load power is greater than or equal to the upper power limit setting of the traction transformer, the power regulating device is configured to convert the electrical energy stored by the energy storage device into corresponding alternating current and transmit the corresponding alternating current to the first power supply arm and/or the second power supply arm.
According to an embodiment of the invention, the power regulating device is configured to transfer active power between the first and second supply arms if the sum of the first and second traction load powers is less than a power upper limit setting of the traction transformer and is greater than or equal to zero.
According to one embodiment of the invention, when active power transfer is performed, the power regulating device is configured to make the useful power output by the first power supply arm and the second power supply arm be the same by transferring the power of the light-load-side power supply arm to the heavy-load-side power supply arm.
According to an embodiment of the invention, if the sum of the first traction load power and the second traction load power is less than zero, the power regulating device is configured to transfer the return electrical energy of the first supply arm and/or the second supply arm to the energy storage device for electrical energy storage by the energy storage device.
According to one embodiment of the invention, the system further comprises:
and the electric energy feedback device is connected with the energy storage device and used for converting the electric energy provided by the energy storage device and transmitting the converted electric energy to an external electric device.
According to an embodiment of the invention, if the sum of the first traction load power and the second traction load power is less than zero and the energy storage device is full, the electric energy feedback device is configured to feed back the feedback power to an external load other than the traction load through the power regulating device.
According to one embodiment of the invention, the power regulating device is further configured to implement reactive power compensation and harmonic suppression on each power supply arm.
The energy efficient utilization system for the railway traction network provided by the invention can absorb regenerative braking generated in the braking process of the train through the energy storage device when the train is braked, and can release electric energy stored by the energy storage device to the train through the power supply arm when the train is in a traction working condition. And, the system can also feed back the electric energy stored by the energy storage device to the distribution substation if needed. Compared with the existing system, the system can greatly improve the utilization rate of the train regenerative braking energy.
Meanwhile, the system can realize active power transfer between the two power supply arms of the traction substation, and can also realize reactive power compensation and harmonic current treatment, so that the electric energy quality of the traction power supply system can be improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required in the description of the embodiments or the prior art:
FIG. 1 is a schematic structural diagram of an energy efficient utilization system according to one embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power conditioning device according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details or with other methods described herein.
Fixed Capacitors (FC), which are the most widely used means to compensate for reactive power by using capacitive or inductive energy storage elements, have the advantages of simple topological structure, free capacity configuration, less investment, easy post-maintenance, etc. However, because the load of the railway locomotive is irregularly changed in a complex nonlinear way, the capacitance compensation is difficult to adapt to the real-time condition of the locomotive load, and the continuous condition of balance cannot be realized.
Meanwhile, the capacity of the traction substation is limited, the voltage of the power supply line has large fluctuation, and the compensation capacity of the capacitor is in proportion to the net flattening square, so that the compensation capacity of the capacitance compensator is constantly changed, and the compensation effect of the capacitance compensator is reduced. The passive filter can filter out specific harmonic components, but the harmonic content in the power supply system is complex, and the harmonic content of certain frequencies can be amplified at the resonance point of the filter, so that the power supply quality is reduced, and the operation safety of the power supply system is threatened.
Because of the advantages of mature development, reliable technology, high cost performance and the like of the Static Var Compensator (SVC for short) controlled by the thyristor, the Static Var Compensator is widely applied in the field of railway power supply quality control.
The SVC is additionally arranged on the power supply arm, so that the voltage of a traction network can be stabilized, the harmonic current circulating on the traction network is restrained, and partial negative-sequence current is compensated. The capacitor bank can send out capacitive reactive power, the reactor can absorb inductive reactive power, and reactive power balance adjustment is realized by switching the capacitor bank or adjusting the reactor. Although SVC has many advantages, it is also a harmonic source in itself, often requiring a matched filter to eliminate second harmonic pollution. Because the traction load is complicated and changeable, the compensation capacity requirement is high, and SVC compensation parameters are difficult to adapt comprehensively, the actual negative sequence treatment effect is often poor.
The passive filter can only eliminate harmonic current of specific frequency fixedly. An Active Power Filter (APF) can sample the load current on the contact network in real time, separate harmonic and reactive power in the current, control the frequency, phase and magnitude of the current required by the APF active output, and suppress the harmonic component in the load current of the contact network, thereby realizing dynamic tracking compensation. The APF can control harmonic waves and compensate reactive power at the same time, and has the advantages of high dynamic response speed, flexible application and the like. Because the harmonic generated by the railway locomotive is rich, the APF has the advantage of meeting the requirement of the quality control of the power supply of the railway. However, the railway power supply voltage level is high, the voltage withstanding level of the APF is limited, and direct access to the traction network is difficult, so that a step-down transformer is generally required to be used for access. Also, due to the APF voltage level limitation, its compensation capacity is limited. Also because the APF operation itself generates high frequency harmonics, a high pass filter is required in parallel with the APF to remove the specific harmonics.
A Static Synchronous Compensator (STATCOM) is mainly connected to a primary side high-voltage bus of a traction substation through a voltage source type converter through a step-down transformer. In order to improve the compensation capacity, a plurality of STATCOMs can be connected in parallel to be hung on the bus. The STATCOM realizes the adjustment of the reactive compensation power direction and magnitude of the traction network by changing the amplitude, phase and frequency of the alternating current output voltage of the voltage source type converter. The STATCOM has high voltage-resistant level, can be directly connected to a primary side three-phase system of the traction transformer, and has large compensation capacity. The STATCOM directly treats the unbalance problem of the three-phase system and has the advantages of high compensation power density, high dynamic response speed and the like. The STATCOM has the advantages of being well suitable for the requirement of the power quality control of a railway power supply system, and the STATCOM device which is input in a Japan new trunk line and the STATCOM device which is operated in a French Evron substation can operate well, so that the control function of the STATCOM is explained.
However, since the primary voltage level of the STATCOM is high, a large-capacity step-down transformer needs to be configured, and a high-pass filter connected in parallel with the STATCOM is needed to eliminate high-frequency harmonics generated in the running process of the STATCOM, which increases the investment cost.
The invention provides a novel energy efficient utilization system for a railway traction network, which can realize the recycling of train regenerative energy and the improvement of electric energy quality.
Fig. 1 shows a schematic structural diagram of an energy efficient utilization system provided by the present embodiment.
As shown in fig. 1, the energy efficient utilization system provided by the present embodiment preferably includes: a power conditioning device 101 and an energy storage device 102. The power conditioner 101 is connected to two power supply arms (for example, a first power supply arm a and a second power supply arm B) of the traction substation, and is configured to transfer power between the two power supply arms. The energy storage device 102 is connected to the power conditioning device 101, and is capable of storing the electric energy transmitted by the power conditioning device 101 according to actual needs, or transmitting the electric energy stored by itself to the power conditioning device 101 according to actual needs, so as to be transmitted by the power conditioning device 101 to the first power supply arm a and/or the second power supply arm B.
As shown in fig. 2, in the present embodiment, the power adjusting apparatus 101 preferably includes: a first converter 201, a second converter 202, a first connection transformer 203 and a second connection transformer 204. The first converter 201 is configured to implement ac-dc conversion or dc-ac conversion according to actual needs, and similarly, the second converter 202 is also configured to implement ac-dc conversion or dc-ac conversion according to actual needs.
In this embodiment, the first converter 201 and the second converter 202 preferably share the dc-side capacitor C, so that a back-to-back structure is formed, and the two converters cooperatively achieve an ac-dc-ac conversion function. Of course, in other embodiments of the present invention, other reasonable connection manners may be adopted between the first converter 201 and the second converter 202 according to actual needs, and the present invention is not limited thereto.
The first converter 201 is preferably connected to the corresponding supply arm (i.e. the first supply arm a) via a first connecting transformer 203, while the second converter 202 is preferably connected to the corresponding supply arm (i.e. the second supply arm B) via a second connecting transformer 204.
It should be noted that in other embodiments of the present invention, the first connection transformer 203 and the second connection transformer 204 may also be replaced by reactors according to actual needs. For example, in one embodiment of the present invention, the first current transformer 201 may be further connected to the corresponding power supply arm (i.e., the first power supply arm a) through a first reactor, and the second current transformer 202 may be connected to the corresponding power supply arm (i.e., the second power supply arm B) through a second reactor.
Of course, in other embodiments of the present invention, the power adjusting device 101 may also be implemented by using other reasonable structures according to actual needs, and the present invention also does not specifically limit this.
As shown in fig. 1 again, in the present embodiment, the energy storage device 102 is connected to the power conditioning device 101, and is capable of storing the electric energy transmitted by the power conditioning device 101 or transmitting the electric energy stored by itself to the power conditioning device 101 according to actual needs.
It should be noted that the energy storage device 102 is connected to the intermediate DC terminal of the power conditioning device 101, and since the intermediate DC voltage of the power conditioning device 101 is likely not matched with the operating voltage of the energy storage device 102, the energy storage device 102 in this embodiment may be equipped with a DC/DC conversion module according to actual needs, so as to implement voltage conversion by the DC/DC conversion module, thereby meeting the operating requirements of the energy storage device 102 and the power conditioning device 101.
Meanwhile, it should be noted that, in different embodiments of the present invention, the energy storage device 102 may be implemented by using different reasonable devices or structures according to actual needs, and the present invention is not limited thereto. For example, in an embodiment of the present invention, the energy storage device 102 may be implemented by a super capacitor or a lithium battery.
The power adjusting device 101 is connected to the first power supply arm a, the second power supply arm B, and the energy storage device 102, and can transfer power among the three according to actual needs.
In this embodiment, the power adjusting device 101 may preferably obtain the first traction load power P corresponding to the first power supply arm a according to the obtained first traction load power PALAnd a second load power P corresponding to the second power supply arm BBLTo adjust the operating state thereof, so as to adjust the transfer state of the electric energy among the first power supply arm a, the second power supply arm B and the energy storage device 102.
It should be noted that, in this embodiment, when the train is in the traction condition, the traction load power corresponding to the train is preferably greater than zero; and when the train is in the braking condition, the corresponding traction load power is preferably negative. It should be noted that there is no inevitable relationship between the positive value and the negative value, and it is more characterized by the form of positive and negative values whether the train is in the traction condition or the braking condition.
In particular, if the first traction load power PALAnd a second traction load power PBLThe sum of the two is greater than or equal to the upper power limit set value P of the traction transformerH(i.e. the presence of PAL+PBL≥PH) Then, the power conditioning device 101 preferably converts the electrical energy stored in the energy storage device 102 into corresponding ac power and transmits the ac power to the first power supply arm a and/or the second power supply arm B. This may cause the electric energy (e.g., regenerative braking energy) stored or absorbed by the energy storage device 102 to flow into the dc bus, and then the output power of the traction transformer is smaller than the power setting value, so as to reduce the output power of the traction transformerThe traction transformer is protected to a certain extent. In this condition, the power conditioning device 101 also implements peak clipping discharge (i.e., peak clipping discharge mode).
If the first traction load power PALAnd a second traction load power PBLThe sum of the two is less than the upper limit power set value P of the traction transformerHBut greater than or equal to zero (i.e., P is present)H＞PAL+PBL≧ 0), the power conditioning device 101 will not transmit power to the energy storage device 102, and will not receive power from the energy storage device 102 at the same time, but will perform power transfer between the first power arm a and the second power arm B. In this embodiment, in this operating condition, the power regulating device 101 preferably ensures that the output active power of the first power supply arm a is the same as that of the second power supply arm B by means of active power transfer (for example, by transferring the power of the light-load-side power supply arm to the heavy-load-side power supply arm). In this condition, the power conditioning device 101 also realizes active transfer (i.e., active transfer mode).
It should be noted that, in this embodiment, according to actual needs, the power conditioning apparatus 101 can also perform functions of compensating the reactive power of the load and/or performing harmonic suppression, which can improve the quality of the electric energy, and thus can also effectively improve the power factor thereof.
In this embodiment, if the first traction load power PALAnd a second traction load power PBLThe sum is less than zero (i.e. P)AL+PAL< 0), when the traction substation load is transmitting, the power conditioning device 101 preferably transmits the feedback power of the first power supply arm a and/or the second power supply arm B to the energy storage device 102 for storing the power by the energy storage device 102.
For example, if the first traction load power PALAnd a second traction load power PBLThe sum is less than zero (i.e. P is present)AL+PBL< 0), that is, the total load status of the first power supply arm a and the second power supply arm B is the regenerative braking status, then the power conditioning device 101 preferably converts the electric energy of the first power supply arm a and/or the second power supply arm B and transmits the converted electric energy to the energy storage device 102, so as to store the converted electric energy by the energy storage device 102, and thus, the electric energy can be stored in the energy storage device 102The regenerative braking energy is prevented from flowing into a traction network through a traction transformer, and the electric energy quality of a traction power supply system is improved.
As shown in fig. 1, in this embodiment, the energy efficient utilization system may further include an electric energy feedback device 103. The electric energy feedback device 103 is connected to the energy storage device 102, and can convert the electric energy stored in the energy storage device 102 into corresponding alternating current according to actual needs to be transmitted to an external electric device connected to the energy storage device. For example, the electric energy feedback device 103 may be connected to the distribution substation, and be capable of converting the electric energy stored in the energy storage device 102 into three-phase alternating current (e.g., AC380V, AC10kV, AC27.5kv, etc.) according to actual needs (e.g., when the sum of the first traction load power and the second traction load power is less than zero and the energy storage device 102 is fully storing electric energy), and transmitting the three-phase alternating current to the distribution substation, which is then provided to other electric loads by the distribution substation.
From the above description, it can be seen that the energy efficient utilization system for a railway traction network provided by the present invention can absorb regenerative braking generated during braking of a train through an energy storage device when the train is braked, and can release electric energy stored in the energy storage device to the train through the traction network when the train is in a traction condition. And, the system can also feed back the electric energy stored by the energy storage device to the distribution substation if needed. Compared with the existing system, the system can greatly improve the utilization rate of the train regenerative braking energy.
Meanwhile, the system can realize active power transfer between two adjacent traction networks, and can also realize reactive power compensation and harmonic current treatment, so that the electric energy quality of the traction power supply system can be improved.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures or process steps disclosed herein, but extend to equivalents thereof as would be understood by those skilled in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While the above examples are illustrative of the principles of the present invention in one or more applications, it will be apparent to those of ordinary skill in the art that various changes in form, usage and details of implementation can be made without departing from the principles and concepts of the invention. Accordingly, the invention is defined by the appended claims.
Claims (11)
1. An energy efficient utilization system for a railroad traction network, the system comprising:
the power adjusting device is connected with the two power supply arms of the traction substation and used for realizing power transfer between the two different power supply arms of the substation;
and the energy storage device is connected with the power regulating device and is used for storing the electric energy transmitted by the power regulating device from the power supply arm or transmitting the electric energy stored by the energy storage device to the power regulating device so as to be transmitted to the power supply arm by the power regulating device.
2. The system of claim 1, wherein the power regulating means comprises:
the converter comprises a first converter and a second converter which are used for realizing direct current-alternating current conversion or alternating current-direct current conversion, wherein the first converter is connected with the second converter;
the alternating current side of the first converter is connected with a first power supply arm through the first connecting transformer or the first reactor;
and the alternating current of the second converter is connected with a second power supply arm through the second connecting transformer or the second reactor.
3. The system of claim 2, wherein the first current transformer and the second current transformer share a dc-side capacitance to form a back-to-back configuration.
4. The system according to any one of claims 1 to 3, wherein the power regulating device is configured to regulate the operation state thereof according to the acquired first traction load power corresponding to the first power supply arm and the acquired second traction load power corresponding to the second power supply arm, so as to adjust the transfer state of the electric energy among the first power supply arm, the second power supply arm and the energy storage device.
5. The system of claim 4, wherein if the sum of the first traction load power and the second traction load power is less than zero, the power conditioning device is configured to transfer the return electrical energy of the first supply arm and/or the second supply arm to the energy storage device for electrical energy storage by the energy storage device.
6. The system of claim 4 or 5, wherein if the sum of the first traction load power and the second traction load power is greater than or equal to a traction transformer upper power limit set point, the power conditioning device is configured to convert the electrical energy stored by the energy storage device into corresponding alternating current and transmit the corresponding alternating current to the first power supply arm and/or the second power supply arm.
7. The system of any of claims 4-6, wherein the power conditioning device is configured to transfer active power between the first and second power supply arms if the sum of the first and second traction load powers is less than a traction transformer upper power limit set point by greater than or equal to zero.
8. The system of claim 7, wherein the power conditioning device is configured to cause the first supply arm and the second supply arm to output the same useful power by transferring power from the light-load-side supply arm to the heavy-load-side supply arm when active power transfer is performed.
9. The system of any one of claims 4 to 8, further comprising:
and the electric energy feedback device is connected with the energy storage device and used for converting the electric energy provided by the energy storage device and transmitting the converted electric energy to an external electric device.
10. The system of claim 9,
if the sum of the first traction load power and the second traction load power is less than zero and the energy storage device is full of energy, the electric energy feedback device is configured to feed back the feedback power to an external load other than the traction load through the power regulating device.
11. The system of any one of claims 1-10, the power conditioning device further configured to implement reactive compensation, harmonic suppression for each power supply arm.
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| CN201910809297.9A CN110611314A (en) | 2019-08-29 | 2019-08-29 | Energy efficient utilization system for railway traction network |
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| CN111216602A (en) * | 2020-01-07 | 2020-06-02 | 兰州交通大学 | Method for distributing and optimizing regenerative braking energy in non-contact traction power supply system station |
| CN111313443A (en) * | 2020-03-16 | 2020-06-19 | 株洲中车时代电气股份有限公司 | Power peak value adjusting system and method for railway traction substation |
| CN111342498A (en) * | 2020-03-16 | 2020-06-26 | 株洲中车时代电气股份有限公司 | Maximum demand control system and method for railway traction substation |
| CN111371109A (en) * | 2020-03-16 | 2020-07-03 | 株洲中车时代电气股份有限公司 | Maximum demand control method and system for railway traction substation |
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| CN111371109A (en) * | 2020-03-16 | 2020-07-03 | 株洲中车时代电气股份有限公司 | Maximum demand control method and system for railway traction substation |
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| CN113533847A (en) * | 2021-08-09 | 2021-10-22 | 盾石磁能科技有限责任公司 | Method and equipment for measuring regenerative braking energy of rail transit |
| CN114301070A (en) * | 2021-12-30 | 2022-04-08 | 重庆中车时代电气技术有限公司 | Control method of regenerative braking energy utilization device and related components |
| CN114301070B (en) * | 2021-12-30 | 2024-02-20 | 重庆中车时代电气技术有限公司 | Control method of regenerative braking energy utilization device and related components |
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