CN107953803B - Medium-voltage flexible direct-current traction power supply system and control method thereof - Google Patents
Medium-voltage flexible direct-current traction power supply system and control method thereof Download PDFInfo
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- CN107953803B CN107953803B CN201711425550.8A CN201711425550A CN107953803B CN 107953803 B CN107953803 B CN 107953803B CN 201711425550 A CN201711425550 A CN 201711425550A CN 107953803 B CN107953803 B CN 107953803B
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/11—Combinations of wind motors with apparatus storing energy storing electrical energy
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a medium-voltage flexible direct-current traction power supply system and a control method thereof. The traction power supply system comprises more than one traction substation; the traction substation comprises a three-phase step-down transformer, a three-phase reactor, a voltage source converter and a first direct current bus which are connected in sequence; the input end of the three-phase step-down transformer is connected to a three-phase power grid, the positive pole and the negative pole of the output end of the voltage source converter are respectively connected to the positive pole and the negative pole of the first direct current bus, and the positive pole and the negative pole of the first direct current bus are respectively connected to a contact net and a steel rail through a feeder line and a return line. The invention has the advantages that the electric energy quality of the system can be greatly improved, the electricity split-phase link is completely eliminated, and the through power supply of the whole traction network is realized. In addition, the system can also increase the power supply distance of a single traction substation, and realize the effective utilization of renewable energy sources along the railway and locomotive regenerative braking energy.
Description
Technical Field
The invention relates to the technical field of traction power supply systems of electrified railways, in particular to a medium-voltage flexible direct-current traction power supply system and a control method thereof.
Background
The traction power supply system is used as a power source spring of the electrified railway, and the quality of the power supply quality of the traction power supply system can generate important influence on the safe, reliable and economic operation of the railway. At present, the main power supply mode of the electrified railways in most countries is that a traction substation takes power from a three-phase power grid through a three-phase-two-phase transformer and converts the power into two phases to supply power to traction grids on two sides respectively. However, with the development of high speed and heavy load of railways, the power supply mode faces a severe test. The main body is as follows: 1) The existing traction power supply system has the problems of negative sequence, harmonic wave, reactive power and the like, so that the electric energy quality of a public power grid is polluted; 2) The existence of the electric split phase becomes one of weak links of safe running of railways, so that smooth and continuous current collection of a locomotive is limited, the speed loss of the locomotive is caused, and the load capacity is reduced; 3) The split-phase segmented power supply prevents the energy generated by regenerative braking of the locomotive from flowing to other power supply sections, so that the voltage of the power supply section is increased, the normal operation of equipment is further influenced, and a large amount of energy is lost; 4) The split-phase segmented power supply mode is not suitable for the access of new energy.
Aiming at the problems of the single-phase power frequency alternating current system traction power supply system, a great deal of research work is carried out by related research and development units, wherein the in-phase power supply technology provides a better solution for solving the problems and is widely concerned and paid attention to. The in-phase traction power supply system based on the existing line transformation can effectively improve the power quality and reduce the electric phase splitting of half of the system. However, the output voltages (amplitude, phase angle, frequency) of adjacent traction substations are different, and it is difficult for the traction substations to achieve true through power supply. With the development of power electronic technology and control theory, the through type in-phase traction power supply system based on the three-phase-single-phase converter is expected to realize through power supply of railways. The traction power supply system can completely cancel electric phase splitting, greatly improve the electric energy quality of a public power grid and a traction network, realize the regeneration and utilization of locomotive brake energy and the access of new energy, and is an ideal novel traction power supply mode.
In recent years, with the development of power electronic technology and control theory, the high-voltage direct-current transmission technology is applied in large scale in the application scene of long-distance and large-capacity electric energy transmission due to the excellent technology and economic performance. In addition, the direct current technology plays an important role in various fields such as ships, subways, micro-grids, household power supply networks and the like. Therefore, the system aims at solving the problems exposed by the existing AC traction power supply system. The direct-current traction power supply system is an important direction for the development of the future high-speed railway and can promote the further development of the high-speed railway.
Disclosure of Invention
The invention aims to provide a medium-voltage flexible direct-current traction power supply system which can greatly improve the electric energy quality of the system, thoroughly eliminate an electric phase splitting link and realize the through power supply of the whole traction network. In addition, the system can also increase the power supply distance of a single traction substation, and realize the effective utilization of renewable energy sources along the railway and locomotive regenerative braking energy. The invention has important significance for renovating the existing power frequency single-phase alternating current power supply mode and promoting the further development of the railway in China.
The technical scheme for realizing the purpose of the invention is as follows: a medium-voltage flexible direct-current traction power supply system comprises more than one traction substation; the traction substation comprises a three-phase step-down transformer, a three-phase reactor, a voltage source converter and a first direct current bus which are connected in sequence; the input end of the three-phase step-down transformer is connected to a three-phase power grid, the positive pole and the negative pole of the output end of the voltage source converter are respectively connected to the positive pole and the negative pole of the first direct current bus, and the positive pole and the negative pole of the first direct current bus are respectively connected to a contact net and a steel rail through a feeder line and a return line.
Further, the system also comprises a new energy device and an energy storage device; the new energy device comprises wind power generation equipment and photovoltaic equipment, and the energy storage device comprises a storage battery, a super capacitor and a flywheel; the new energy device and the energy storage device are respectively connected to the positive pole and the negative pole of the first direct current bus through an AC-DC or DC-DC converter.
Further, the system also comprises a new energy device and an energy storage device; the new energy device comprises wind power generation equipment and photovoltaic equipment, and the energy storage device comprises a storage battery, a super capacitor and a flywheel; the new energy device and the energy storage device are connected to the anode and the cathode of the second direct current bus through an AC-DC or DC-DC converter respectively, and the anode and the cathode of the second direct current bus are connected to a contact net and a steel rail respectively.
In the technical scheme, the range of the output direct-current voltage of the voltage source converter is 16 kV-35 kV.
A control method for a medium-voltage flexible direct-current traction power supply system collects direct-current voltage and current output by a traction substation, and adjusts the output voltage of the traction substation according to a voltage-current droop characteristic curve and an actual output voltage amplitude value, and comprises the following steps:
collecting direct current voltage and current output by traction power transformer, and performing low-pass filtering to obtain corresponding direct current voltage
U dcmea And current I dcmea ；
By passing
Obtaining a reference value of the output voltage of the traction substation at the current moment: wherein, U dc * Is a reference value of the output voltage of the traction substation, U dcrate Is a rated value of the output voltage of the traction transformer, R droop Is the sag factor; />
Is proportional integral control, K pco And K ico Proportional and integral coefficients, respectively;
the voltage source converter in the traction substation is controlled by a voltage-current double closed loop to make the output voltage of the traction substation equal to the reference voltage U dc * 。
Compared with the prior art, the invention has the beneficial effects that:
1. in the medium-voltage flexible direct-current traction power supply system provided by the invention, a voltage source converter converts three-phase alternating current into 16-35 kV direct-current voltage for a traction train. Because the amplitude of the output voltage of the voltage source converter is controllable, an electric phase splitting device of the traction network can be completely eliminated, and the traction network can form a through power supply network.
2. The voltage source converter can ensure the complete balance of three-phase power load, can work in a rectification state and an inversion state, and can independently control active power and reactive power. Therefore, the energy generated by the regenerative braking of the locomotive can be fully utilized. Meanwhile, under the direct current mode, the access of renewable energy sources and energy storage devices becomes easier, and the method has important significance for promoting the green sustainable development of the traction power supply system.
3. In a direct current mode, because the traction network does not have inductive reactance, the distance of the power supply arm can be longer under the condition of ensuring the same voltage quality; meanwhile, the contact net and the steel rail in a direct current mode have no skin effect, and the cross section of the lead can be fully utilized, so that the structure of the contact net can be simpler, and the power supply capacity same as that of alternating current can be realized by using fewer leads.
4. The method provided by the invention aims at the medium-voltage flexible direct-current traction power supply system, does not need to acquire signals except local information, does not depend on communication between traction substations, and can compensate voltage drop caused by traditional droop control, so that the system voltage is recovered, and the safe and stable operation of the system is realized.
Drawings
Fig. 1 is a schematic structural diagram of a medium-voltage flexible direct-current traction power supply system.
Fig. 2 is a control block diagram of a voltage source converter in a traction substation.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, a medium-voltage flexible dc traction power supply system is formed by interconnecting a plurality of traction substations through a traction network to form a through dc power supply network for supplying electric energy to a locomotive; wherein, every pulls the substation and includes: the three-phase step-down transformer, the three-phase reactor, the voltage source converter and the direct current bus are connected in sequence. The positive pole and the negative pole of the output end of the voltage source converter are respectively connected with the positive pole and the negative pole of a direct current bus of the traction substation, and the positive pole and the negative pole of the direct current bus are respectively connected with a contact net and a steel rail through a feeder line and a return line.
In the medium-voltage flexible direct-current traction power supply system, the range of the direct-current voltage output by the voltage source converter is 16 kV-35 kV.
A new energy source and an energy storage device are also connected to the traction network of the medium-voltage flexible direct-current traction power supply system, and the new energy source (wind power, photovoltaic and the like) and the energy storage device (a storage battery, a super capacitor, a flywheel and the like) are connected to the system through an AC-DC or DC-DC converter. The new energy and the energy storage device can be arranged independently or in a traction substation.
The control method of the medium-voltage flexible direct-current traction power supply system comprises the following steps that each traction substation collects output direct-current voltage and current and automatically adjusts the output voltage of the traction substation according to a voltage-current droop characteristic curve and an actual output voltage amplitude value, and specifically comprises the following steps:
1) Collecting and low-pass-processing direct-current voltage and current output by traction substationFiltering to obtain corresponding DC voltage U dcmea And current I dcmea ；
2) Obtaining a reference value of the output voltage of the traction substation according to an equation (3):
wherein, U dc * Is a reference value of the output voltage of the traction substation, U dcrate Is a rated value of the output voltage of the traction transformer, R droop Is the sag factor, K pco And K ico Proportional and integral coefficients, respectively.
3) And (3) controlling a voltage source converter in the traction substation through a voltage and current double closed loop to enable the output voltage of the traction substation to be equal to the reference voltage obtained in the step 2), and enabling the system voltage to be recovered.
A control block diagram of the voltage source converter in each traction substation is shown in figure 2.
Claims (1)
1. A control method of a medium-voltage flexible direct-current traction power supply system is characterized by comprising the following steps: direct current voltage and current that the collection was pull the electric substation and exported adjust the output voltage of pulling the electric substation according to voltage-droop characteristic curve of electric current and actual output voltage amplitude value, include:
collecting direct current voltage and current output by traction power transformer, and performing low-pass filtering to obtain corresponding direct current voltage U dcmea And current I dcmea ；
By passing
Obtaining a reference value of the output voltage of the traction substation at the current moment: wherein, U dc * Is a reference value of the output voltage of the traction substation, U dcrate Is a rated value of the output voltage of the traction transformer, R droop Is the sag factor; />
Is proportional integral control, K pco And K ico Proportional and integral coefficients, respectively;
the voltage source converter in the traction substation is controlled by a voltage-current double closed loop to make the output voltage of the traction substation equal to the reference voltage U dc * 。
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| CN201711425550.8A CN107953803B (en) | 2017-12-25 | 2017-12-25 | Medium-voltage flexible direct-current traction power supply system and control method thereof |
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| CN201711425550.8A CN107953803B (en) | 2017-12-25 | 2017-12-25 | Medium-voltage flexible direct-current traction power supply system and control method thereof |
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| CN107953803A CN107953803A (en) | 2018-04-24 |
| CN107953803B true CN107953803B (en) | 2023-04-18 |
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| CN108599161B (en) * | 2018-06-20 | 2023-09-01 | 西南交通大学 | Through traction power supply system |
| CN110654241B (en) * | 2018-06-29 | 2023-03-21 | 中车株洲电力机车研究所有限公司 | Optimized energy interconnection system for urban rail train |
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| CN109606208B (en) * | 2019-01-11 | 2023-11-03 | 西南交通大学 | Off-grid railway traction power supply system and regulation and control method |
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| CN110460077B (en) * | 2019-08-27 | 2022-04-26 | 西南交通大学 | Control method of new energy power supply system for urban rail traction network |
| CN110635470B (en) * | 2019-11-11 | 2022-03-18 | 西南交通大学 | Layered control method for flexible medium-voltage direct-current railway power supply system |
| CN111251948B (en) * | 2020-05-06 | 2020-08-21 | 北京中清智辉能源科技有限公司 | Rail transit traction power supply system |
| CN112350377B (en) * | 2021-01-11 | 2021-04-13 | 西南交通大学 | In-phase traction power supply power generation system and control method |
| CN112977077B (en) * | 2021-02-20 | 2022-06-10 | 天津大学 | Flexible direct-current traction power supply system operation domain model construction and solution method |
| CN113300349A (en) * | 2021-05-31 | 2021-08-24 | 湖南铁道职业技术学院 | Subway traction power supply method and system |
| CN113497461B (en) * | 2021-09-08 | 2021-11-23 | 西南交通大学 | Three-phase traction network distributed power generation and supply system and control method |
| CN114498715B (en) * | 2021-12-21 | 2023-01-03 | 西南交通大学 | New energy storage system with centralized access to flexible traction transformer and control method |
| CN114447972B (en) * | 2021-12-21 | 2022-11-22 | 西南交通大学 | Through flexible traction substation with existing traction transformer and protection configuration method thereof |
| CN114498576B (en) * | 2021-12-21 | 2022-10-14 | 西南交通大学 | MMC-based run-through flexible traction substation and protection configuration method thereof |
| CN115333105B (en) * | 2022-08-29 | 2024-04-12 | 西南交通大学 | AC/DC energy storage power supply system and energy control method for electrified railway |
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| CN103448573B (en) * | 2013-07-29 | 2015-11-18 | 华北电力大学（保定） | A kind of inter-act electrified railway HVDC tractive power supply system |
| CN104029610A (en) * | 2014-04-30 | 2014-09-10 | 西南交通大学 | Continuous type traction power supply system based on multilevel converters connected in parallel |
| CN104527462A (en) * | 2014-11-24 | 2015-04-22 | 西南交通大学 | Existing traction power supply system based improved parallel through type traction power supply system |
| CN104967141B (en) * | 2015-06-26 | 2017-12-26 | 许继电气股份有限公司 | A kind of Hybrid HVDC system |
| CN105552948B (en) * | 2016-02-05 | 2019-06-25 | 国网浙江省电力公司湖州供电公司 | A kind of power grid frequency modulation method based on flexible HVDC transmission system |
| CN106130056B (en) * | 2016-07-05 | 2019-03-05 | 清华大学 | Flexible HVDC transmission system based on combined modular Multilevel Inverters |
| CN207697541U (en) * | 2017-12-25 | 2018-08-07 | 西南交通大学 | Flexible direct current tractive power supply system is pressed in one kind |
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