CN110729731A - Through type in-phase power supply structure of electrified railway and control method thereof - Google Patents
Through type in-phase power supply structure of electrified railway and control method thereof Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 69
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 230000008929 regeneration Effects 0.000 claims description 9
- 238000011069 regeneration method Methods 0.000 claims description 9
- 230000001172 regenerating effect Effects 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
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- 230000002146 bilateral effect Effects 0.000 description 1
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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
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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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- 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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Abstract
The invention provides a through type in-phase power supply structure of an electrified railway and a control method thereof, belonging to the technical field of power supply of alternating current electrified railways. The structure comprises a substation S1, a main traction substation CPS and a No. 1 traction substation SPS1(n-1) th traction substation SPSn‑1The system comprises a traction network OCS and an optical fiber network FO, wherein the main substation CPS comprises a high-voltage bus, a main transformer and an energy storage device; the energy storage device is arranged on the high-voltage side of the main substation and comprises a high-voltage matching transformer MT, a converter CO, an energy storage device SD and a measurement and control unit PS, wherein the measurement and control unit detects the total power of traction loads of a traction substation group, compares the total power with a negative sequence power allowable value, controls the power of the energy storage device and the power of the converter in real time by combining the charge state of the energy storage device, performs peak clipping and valley filling on the traction loads, and solves the problem of insufficient system capacityNegative sequence problem, and improved system power quality.
Description
Technical Field
The invention belongs to the technical field of power supply of alternating current electrified railways, and particularly relates to a regenerative braking energy utilization and electric energy quality control technology of a traction substation.
Background
The power supply mode of the electrified railway in China is a single-phase power frequency alternating current system, and the power is supplied by a public power system. Due to the single-phase independence and asymmetry of the traction load, negative sequence current is generated in a traction power supply system, and the negative sequence current has great influence on a generator, a relay protection device and the like. Therefore, the electric phase separation is arranged to carry out phase sequence rotation and phase separation partition power supply. However, when the train passes through the electric phase separation, the speed is reduced, the traction force is lost, the safety of a traction network and the high-speed running of the train are seriously influenced, and the reliability of the electric phase separation device is low and is the weakest part in a traction power supply system. On the basis, through type in-phase power supply is provided, namely a single-phase traction transformer is adopted in a traction substation to cancel electric phase splitting at an outlet bus of the traction substation, and a bilateral power supply technology is adopted to cancel electric phase splitting between adjacent power supply areas in a subarea.
In order to avoid the power passing through, an external power supply is arranged in a radiation type power supply mode, namely, a segmented bus of the same transformer substation in a power grid respectively supplies power to a plurality of traction transformer substations, and the traction transformer substations are called as traction transformer substation groups. The optimized traction substation group is composed of a main substation and other traction substations. The main substation is also called a negative sequence compensation substation, and is provided with a compensation device for centralized compensation of a negative sequence, all substations in the group are single-phase substations, and the voltages of the traction buses are the same.
In the scheme of the traction substation group, on one hand, through-type in-phase power supply is adopted to enable traction loads to have unidirectionality relative to a three-phase power network, so that three-phase voltage unbalance is caused, and the negative sequence problem is prominent. On the other hand, the traction load fluctuates severely, the utilization rate of equipment such as a traction transformer is low, the operation cost is greatly improved, the regenerative braking energy of the whole traction substation group is not utilized, and the economic benefit is low. In view of this, the invention designs an electrified railway in-phase power supply structure and a control method thereof.
Disclosure of Invention
The invention aims to provide a through-type in-phase power supply structure of an electrified railway, which can effectively solve the problem of negative sequence when the short-circuit capacity of a system is limited.
The invention also aims to provide a control method of the through-type in-phase power supply structure of the electrified railway, which can effectively solve the technical problems of unified control and management of peak clipping and valley filling, negative sequence treatment and energy utilization, so that the negative sequence treatment reaches the national standard, and the regenerative braking energy is effectively stored and utilized.
The purpose of the invention is realized by the following technical scheme: a through-type in-phase power supply structure of an electrified railway comprises a transformer substation S1, a main traction substation CPS, a traction network OCS and an optical fiber network FO, and is characterized in that: the main traction substation CPS and n-1 traction substations along the railway form a traction substation group, wherein n is more than or equal to 2; the substation S1 supplies power to the traction substation group in a radiation mode, one end of a secondary winding of a traction transformer in each traction substation is connected with the corresponding traction buses TB and TB in the same phase1、TB2、……、TBn-1And out of the traction feeder F, F1、F2、……、Fn-1The other end is grounded; in a traction substation group, an energy storage device is arranged on the high-voltage side of a main traction substation CPS; in the energy storage device, a primary side of a high-voltage matching transformer MT is connected with a line voltage for supplying power to a traction substation group in a three-phase high-voltage power grid output by a substation S1, and a secondary side of the high-voltage matching transformer MT is connected with an alternating current port of a converter CO; a direct current side port of the converter CO is connected with the energy storage device SD; the measurement and control unit PS is provided with 2n +1 input ends and an output end Out1 of In 1-In (2n + 1); wherein, the input ends In1, In2 are respectively connected to a voltage transformer PT and a current transformer CT at a feeder F led out by a traction bus TB of the main traction substation CPS, and the input ends In3, In4 are respectively connected to the 1 st traction transformer In the traction substation group through an optical fiber network FOElectric station SPS1Inner traction transformer feeder F1First voltage transformer PT1A first current transformer CT1The input ends In (2n-1) and In (2n) are respectively connected to the (n-1) th traction substation SPS In the traction substation group through the optical fiber network FOn-1At the feed line F of the traction transformern-1N-1 th voltage transformer PTn-1N-1 current transformer CTn-1The input end In (2n +1) is connected to the charge state output end of the energy storage device SD, and the output end Out1 of the measurement and control unit PS is connected to the control end of the converter CO.
The rated power Pa of the converter CO is equal to the rated power Pb of the energy storage device SD, and the energy storage device power Pb is greater than or equal to the large value S of the total traction load probability of 95%95％And negative sequence power allowed value S(-)The difference is that the energy storage capacity Sb is larger than or equal to the maximum value of the accumulated energy of the power continuously exceeding the negative sequence of the load power curve.
The other purpose of the invention is realized by the following technical scheme: a control method of a through-type In-phase power supply structure of an electrified railway is characterized In that a measurement and control unit PS of the through-type In-phase power supply structure of the electrified railway obtains real-time power of a traction bus TB led out by a traction transformer In a main traction substation CPS through input ends In1 and In2, the real-time power is marked as p1, and a 1 st traction substation SPS is obtained through input ends In3 and In41Traction bus TB led out by internal traction transformer1The real-time power is recorded as p2, … …, and the SPS of the (n-1) th traction substation is obtained through input ends In (2n-1) and In (2n)n-1Traction bus TB led out by internal traction transformern-1The real-time power is recorded as pn, so that the total power S of the traction load of the traction substation group is p1+ p2+ … … + pn; acquiring a flag value of the state of charge SOC of the energy storage SD through an input end In (2n + 1); recording the real-time running power of the converter CO as pa and the real-time running power of the energy storage device SD as pb, and allowing the power to be S according to the traction load power S and the negative sequence power(-)And the value of the SOC controls the rectification or inversion of the converter CO in real time to ensure that the traction substation group and the energy storage device SD finish power exchange, so as to realize negative sequence compensation of the traction substation group and conversion, storage and utilization of regenerative braking energy.
1) When the traction load power S is larger than the negative sequence power allowable value S(-)Under the condition that the load power S-release power pb is less than or equal to the negative sequence power allowable value S, when the state of charge SOC of the energy storage device SD is greater than the discharge lower limit value, the measurement and control unit PS controls the converter CO to invert and the energy storage device SD to release electric energy(-)(ii) a When the state of charge SOC is less than or equal to the lower discharge limit value, the converter CO and the energy storage device SD are in standby, and pa is 0;
2) when the traction load power S is smaller than the negative sequence power allowable value S(-)Under the condition, when the state of charge SOC of the energy storage device SD is smaller than the charging upper limit value, the measurement and control unit PS controls the converter CO to rectify and the energy storage device SD to charge: if S is greater than 0, the charging power pb + the load power S is less than or equal to the negative sequence power allowable value S(-)(ii) a If S is less than 0, namely the total load power is the regeneration condition, the charging power pb is the load regeneration power-S, if the load regeneration power-S is more than the maximum charging power pb of the energy storage device SDmaxIf the charging power is not the maximum charging power, the energy storage device SD stores energy with the maximum charging power; when the state of charge SOC of the energy storage device SD is larger than or equal to the charging upper limit value, the converter CO and the energy storage device SD are in standby, and pa is 0; 3) when the traction load power S is equal to the negative sequence power allowable value S(-)In the case of (1), the converter CO and the energy storage SD are on standby, pa ═ pb ═ 0.
The working principle of the invention is as follows: in the traction substation group, one traction substation is selected as a main substation, an energy storage device is arranged, the total power of traction loads of the traction substation group is detected through a measurement and control unit in the device, the total power is compared with a negative sequence power allowable value, and meanwhile, the rectification and inversion of a converter are controlled in time according to the charge state of an energy storage device, so that the power of the traction substation group and the power of the energy storage device are exchanged, peak clipping and valley filling are carried out on the traction loads, and the negative sequence problem is improved and the regenerative braking energy is effectively utilized.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the energy storage device is added in the existing traction substation group scheme, and peak clipping and valley filling of traction load are realized through charging and discharging of the energy storage device, so that the negative sequence problem when the system capacity is insufficient is effectively solved, the electric energy quality of the system is improved, the regenerative braking energy can be effectively utilized, and the economic benefit is higher.
2. Compared with the traditional method, the centralized storage and utilization of the regenerative braking energy of the substation group greatly reduce the number and capacity of energy accumulators and save the floor area of the traction substation.
3. The invention has simple structure, less equipment quantity and easy implementation.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a control method and a control flow according to an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Fig. 1 shows that the specific embodiment of the present invention is: a through-type in-phase power supply structure of an electrified railway comprises a transformer substation S1, a main traction substation CPS, a traction network OCS and an optical fiber network FO, wherein the main traction substation CPS and n-1 traction substations form a traction substation group, wherein n is more than or equal to 2; the substation S1 supplies power to the traction substation group in a radiation mode, and one end of a secondary winding of a traction transformer in each traction substation is connected with traction buses TB and TB in the same phase1、TB2……TBn-1And out of the traction feeder F, F1、F2……Fn-1(ii) a The other end is grounded; in the traction substation group, an energy storage device is arranged on the high-voltage side of the CPS of the main traction substation.
And in the traction substation group, the upper limit of the number n of the traction substations is determined according to the power supply capacity of the previous-stage power system.
In the energy storage device, a primary side of a high-voltage matching transformer MT is connected with a line voltage which is used for supplying power to a traction substation group in a three-phase high-voltage power grid output by a substation S1, and a secondary side of the high-voltage matching transformer MT is connected with an alternating current port of a converter CO; a direct current side port of the converter CO is connected with the energy storage device SD; the measurement and control unit PS is provided with 2n +1 input ends In 1-In (2n +1) and an output end Out1, wherein the input ends In1 and In2 are respectively connected to a feeder F led Out by a traction bus TB of the main traction substation CPSThe input ends In3 and In4 of the voltage transformer PT and the current transformer CT are respectively connected to the 1 st traction substation SPS of the traction substation group through an optical fiber network FO1First voltage transformer PT at the feed line of the traction transformer1A first current transformer CT1The input ends In (2n-1) and In (2n) are connected to the n-1 th traction substation SPS of the traction substation group through the optical fiber network FOn-1The n-1 th voltage transformer PT at the feeder line of the traction transformern-1N-1 current transformer CTn-1The input end In (2n +1) is connected to the charge state output end of the energy storage device SD, and the output end Out1 of the measurement and control unit PS is connected to the control end of the converter CO.
The rated power Pa of the converter CO is equal to the rated power Pb of the energy storage device SD, and the energy storage device power Pb is greater than or equal to the large value S of the total traction load probability of 95%95％And negative sequence power allowed value S(-)The difference is that the energy storage capacity Sb is larger than or equal to the maximum value of the accumulated energy of the power continuously exceeding the negative sequence of the load power curve.
FIG. 2 is a schematic diagram of a control method and a control flow of an embodiment of the invention, a measurement and control unit PS obtains total traction load power through a voltage transformer PT and a current transformer CT, calculates a negative sequence power allowable value, takes a load power curve higher than the negative sequence power allowable value as a peak and a load power curve lower than the negative sequence power allowable value as a valley, takes load peak clipping as a target, and takes a time t step length △(s).
When the total traction load power is larger than the negative sequence power allowable value, if the state of charge of the energy storage device is larger than the lower discharge limit, the measurement and control unit PS commands the converter CO to invert and the energy storage device SD to discharge, and the difference between the load power and the energy storage device discharge power is not larger than the negative sequence power allowable value. And if the charge state of the energy storage SD is less than or equal to the lower discharge limit, the converter CO and the energy storage SD are in standby.
When the total traction load power is smaller than the negative sequence power allowable value, if the charge state of the energy storage device is smaller than the charging upper limit, the measurement and control unit PS commands the converter CO to rectify and the energy storage device SD to charge: if the traction load power is greater than or equal to 0, the sum of the energy storage charging power and the load power is not greater than a negative sequence power allowable value; if the traction load power is less than 0, namely the total load power is a regeneration condition, the charging power of the energy storage device is equal to the absolute value of the load regeneration power, and if the load regeneration power is greater than the maximum charging power of the energy storage device, the energy storage device stores energy with the self maximum charging power. And if the state of charge of the energy storage SD is larger than or equal to the upper charging limit, the converter CO and the energy storage SD are in standby.
When the total traction load power is equal to the negative sequence power allowable value, the converter CO and the energy storage device SD are both in standby.
Claims (4)
1. A through-type in-phase power supply structure of an electrified railway comprises a transformer substation S1, a main traction substation CPS, a traction network OCS and an optical fiber network FO, and is characterized in that: the main traction substation CPS and n-1 traction substations along the railway form a traction substation group, wherein n is more than or equal to 2; the substation S1 supplies power to the traction substation group in a radiation mode, one end of a secondary winding of a traction transformer in each traction substation is connected with the corresponding traction buses TB and TB in the same phase1、TB2、……、TBn-1And out of the traction feeder F, F1、F2、……、Fn-1The other end is grounded; in a traction substation group, an energy storage device is arranged on the high-voltage side of a main traction substation CPS; in the energy storage device, a primary side of a high-voltage matching transformer MT is connected with a line voltage for supplying power to a traction substation group in a three-phase high-voltage power grid output by a substation S1, and a secondary side of the high-voltage matching transformer MT is connected with an alternating current port of a converter CO; a direct current side port of the converter CO is connected with the energy storage device SD; the measurement and control unit PS is provided with 2n +1 input ends and an output end Out1 of In 1-In (2n + 1); wherein, the input ends In1 and In2 are respectively connected to a voltage transformer PT and a current transformer CT at a feeder F led out by a traction bus TB of the main traction substation CPS, and the input ends In3 and In4 are respectively connected to a SPS of the 1 st traction substation In the traction substation group through an optical fiber network FO1Inner traction transformer feeder F1First voltage transformer PT1A first current transformer CT1The input ends In (2n-1) and In (2n) are respectively connected to the (n-1) th traction substation SPS In the traction substation group through the optical fiber network FOn-1At the feed line F of the traction transformern-1N-1 th voltage transformer PTn-1N-1 current transformer CTn-1The input end In (2n +1) is connected to the charge state output end of the energy storage device SD, and the output end Out1 of the measurement and control unit PS is connected to the control end of the converter CO.
2. The through-type in-phase power supply structure of the electrified railway according to claim 1, wherein a rated power Pa of the converter CO is equal to a rated power Pb of the accumulator SD, and the accumulator power Pb is equal to or greater than a 95% probability maximum value S of a total traction load95％And negative sequence power allowed value S(-)The difference is that the energy storage capacity Sb is larger than or equal to the maximum value of the accumulated energy of the power continuously exceeding the negative sequence of the load power curve.
3. A control method of a through-type in-phase power supply structure of an electrified railway is characterized by comprising the following steps: the method comprises the steps that a measurement and control unit PS of the electrified railway through-type In-phase power supply structure obtains real-time power of a traction bus TB led out from a traction transformer In a main traction substation CPS through input ends In1 and In2, the real-time power is recorded as p1, and a 1 st traction substation SPS is obtained through input ends In3 and In41Traction bus TB led out by internal traction transformer1The real-time power is recorded as p2, … …, and the SPS of the (n-1) th traction substation is obtained through input ends In (2n-1) and In (2n)n-1Traction bus TB led out by internal traction transformern-1The real-time power is recorded as pn, so that the total power S of the traction load of the traction substation group is p1+ p2+ … … + pn; acquiring a flag value of the state of charge SOC of the energy storage SD through an input end In (2n + 1); recording the real-time running power of the converter CO as pa and the real-time running power of the energy storage device SD as pb, and allowing the power to be S according to the traction load power S and the negative sequence power(-)And the value of the SOC controls the rectification or inversion of the converter CO in real time to ensure that the traction substation group and the energy storage device SD finish power exchange, so as to realize negative sequence compensation of the traction substation group and conversion, storage and utilization of regenerative braking energy.
4. The control method of the through-type in-phase power supply structure of the electrified railway according to claim 3, characterized in that: first, theFirstly, when the traction load power S is larger than the negative sequence power allowable value S(-)Under the condition that the load power S-release power pb is less than or equal to the negative sequence power allowable value S, when the state of charge SOC of the energy storage device SD is greater than the discharge lower limit value, the measurement and control unit PS controls the converter CO to invert and the energy storage device SD to release electric energy(-)(ii) a When the state of charge SOC is less than or equal to the lower discharge limit value, the converter CO and the energy storage device SD are in standby, and pa is 0;
second, when the traction load power S is smaller than the negative sequence power allowable value S(-)Under the condition, when the state of charge SOC of the energy storage device SD is smaller than the charging upper limit value, the measurement and control unit PS controls the converter CO to rectify and the energy storage device SD to charge: if S is greater than 0, the charging power pb + the load power S is less than or equal to the negative sequence power allowable value S(-)(ii) a If S is less than 0, namely the total load power is the regeneration condition, the charging power pb is the load regeneration power-S, if the load regeneration power-S is more than the maximum charging power pb of the energy storage device SDmaxIf the charging power is not the maximum charging power, the energy storage device SD stores energy with the maximum charging power; when the state of charge SOC of the energy storage device SD is larger than or equal to the charging upper limit value, the converter CO and the energy storage device SD are in standby, and pa is 0;
thirdly, when the traction load power S is equal to the negative sequence power allowable value S(-)In the case of (1), the converter CO and the energy storage SD are on standby, pa ═ pb ═ 0.
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| CN111890995A (en) * | 2020-06-28 | 2020-11-06 | 中铁第一勘察设计院集团有限公司 | Bilateral through power supply system for electrified railway |
| CN113489006A (en) * | 2021-07-30 | 2021-10-08 | 盾石磁能科技有限责任公司 | Energy management device in traction power supply system and traction power supply system |
| CN113497461A (en) * | 2021-09-08 | 2021-10-12 | 西南交通大学 | Three-phase traction network distributed power generation and supply system and control method |
| CN114498671A (en) * | 2021-12-21 | 2022-05-13 | 西南交通大学 | Flexible traction power supply system and energy coordination control method thereof |
| CN114336642A (en) * | 2022-03-17 | 2022-04-12 | 西南交通大学 | Bilateral power supply ride-through power utilization system of traction network and control method |
| CN114336643A (en) * | 2022-03-17 | 2022-04-12 | 西南交通大学 | System for utilizing passing power of bilateral power supply traction network of regional station and control method |
| CN114336642B (en) * | 2022-03-17 | 2022-06-07 | 西南交通大学 | Bilateral power supply ride-through power utilization system of traction network and control method |
| WO2023173783A1 (en) * | 2022-03-17 | 2023-09-21 | 西南交通大学 | Traction network bilateral power supply ride-through power utilization system, and control method |
| CN114906015A (en) * | 2022-04-21 | 2022-08-16 | 西南交通大学 | Alternating current-direct current traction power supply structure and control method for electrified railway |
| CN114906015B (en) * | 2022-04-21 | 2023-04-07 | 西南交通大学 | Alternating current-direct current traction power supply structure and control method for electrified railway |
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