CN109038630B - Electric iron power supply system with energy storage auxiliary service function and control method - Google Patents
Electric iron power supply system with energy storage auxiliary service function and control method Download PDFInfo
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- CN109038630B CN109038630B CN201810933974.3A CN201810933974A CN109038630B CN 109038630 B CN109038630 B CN 109038630B CN 201810933974 A CN201810933974 A CN 201810933974A CN 109038630 B CN109038630 B CN 109038630B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 218
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003137 locomotive effect Effects 0.000 claims abstract description 103
- 238000012544 monitoring process Methods 0.000 claims abstract description 76
- 230000005540 biological transmission Effects 0.000 claims description 11
- 206010068065 Burning mouth syndrome Diseases 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
Abstract
The application discloses an electric iron power supply system with an energy storage auxiliary service function and a control method, wherein the system comprises a battery energy storage network, a traction power grid, a railway network and a monitoring network for coordinated power supply, the battery energy storage network comprises a plurality of battery energy storage units connected in parallel on a bus, the traction power grid inputs the high-voltage power grid into the bus after reducing the voltage, the battery energy storage units supply power, and the battery energy storage units supply power for the railway network through the bus. According to the electrified railway power supply system and the control method, the battery energy storage unit is used for directly supplying power to a railway network, the direct connection between a 35 kV-220 kV power grid and a DN traction network in the traction power grid is cut off, under the dispatching of a monitoring network, the battery energy storage network collects electric energy of the 35 kV-220 kV power grid through a transformer, the influence of the electric energy quality of the 35 kV-220 kV power grid due to the reduction of harmonic waves, negative sequences, power factors and the like is avoided, and the peak regulation pressure of the power grid is reduced; the stable, reliable, continuous and safe electric energy is provided for intermittent, high-power and extremely impact locomotive loads.
Description
Technical Field
The application relates to an electric iron power supply system with an energy storage auxiliary service function and a control method, and belongs to the field of railway networks.
Background
At present, an electrified railway system becomes one of indispensable modes for cargo transportation and people traveling, and lays a deep foundation for economic development in China. The electrified railway power supply system mainly adopts a power supply mode (mode one) of a V/V wiring as shown in fig. 1 or adopts a power supply mode (mode two) of a Scott wiring as shown in fig. 1. As can be seen from fig. 1, the electrified railway mainly comprises a 220kV high-voltage railway network, a high-voltage transmission line, a plurality of traction stations and a traction network, and has the following problems:
1) The railway locomotive load has the characteristics of high power, impact, asymmetry (adopting a single-phase power supply mode), energy feedback to a contact net by braking and the like, the electric energy quality (harmonic wave and negative sequence) and the power factor of a 220kV high-voltage network are seriously influenced, trains passing through each 20-30 km power supply arm every day are not very dense, so that the utilization rate of a plurality of traction transformers is very low, extremely high capacity electric charge needs to be paid each year, and the construction cost and the operation and maintenance cost are indirectly increased by the SVG, the comprehensive tide controller and other devices arranged at a grid-connected point;
2) At present, the power supply of a railway train completely depends on a railway network, and in order to ensure stable, continuous, safe and reliable power supply of a high-speed rail, a system secondary device and a system secondary device need redundant configuration, the protection setting is complex, and the construction and operation and maintenance costs are high.
3) The engineering construction cost is high and the time is long when the 220kV high-voltage transmission line is constructed; in remote areas such as the western part, the 220kV high-voltage railway network is far away from the railway or is weak, so that the traction network and the traction station cannot be constructed, the railway cannot pass smoothly, the smooth traveling of local people is seriously influenced, and the efficient benign development of local economy is restricted.
In view of the above, the present inventors have studied this, and developed an electric iron power supply system and a control method with an energy storage auxiliary service function.
Disclosure of Invention
The application aims to provide an electric iron power supply system with an energy storage auxiliary service function and a control method, which can provide stable, reliable, continuous and safe electric energy for locomotive load.
In order to achieve the above object, the solution of the present application is:
the utility model provides an electric iron power supply system with auxiliary service function of energy storage, includes battery energy storage net, pulls electric wire netting, railway network and is used for coordinating battery energy storage net, pulls electric wire netting, railway network power supply's monitoring network, wherein, battery energy storage net includes a plurality of battery energy storage units of parallelly connected on the bus, pull electric wire netting and input the bus after stepping down high-voltage electric wire netting, for battery energy storage unit power supply, battery energy storage unit passes through the bus and supplies power for railway network.
Preferably, the traction power grid comprises a 35 kV-220 kV power grid, a power transmission line and a traction transformer, wherein the 35 kV-220 kV power grid continuously supplies power to the traction transformer through the power transmission line, and the traction transformer outputs the voltage of the 35 kV-220 kV to a 27.5kV bus after the voltage is reduced to 27.5 kV.
Preferably, the railway network comprises a contact line connected with a 27.5kV busbar and a track, and a return line connected with the track, wherein the locomotive runs on the track.
Preferably, the battery energy storage unit comprises a battery, an energy storage current device (PCS) and a transformer which are sequentially connected, wherein the transformer is connected with the bus; the battery, the energy storage current device and the transformer are all connected with the monitoring network. Under the dispatching of a monitoring network, the battery energy storage unit collects electric energy of a 35 kV-220 kV power grid through a small-capacity transformer, provides stable, reliable, continuous and safe electric energy for locomotive load, absorbs feedback power of locomotive braking, cuts off direct connection between the 35 kV-220 kV power grid and a traction network, and avoids adverse effects of damaged electric energy quality, reduced power factors and the like of the 35 kV-220 kV power grid.
Preferably, the battery energy storage unit is of a modularized structure, and all components in the battery energy storage unit are configured in the same shell. The modularized structure facilitates the use of the battery energy storage units, and ensures that each battery energy storage unit is reserved for each other.
Preferably, the monitoring network comprises a main control system, a main coordination controller, a telecontrol device, microcomputer protection and a switch; each energy storage current device in each energy storage unit is communicated with a corresponding battery BMS, and all the battery BMSs exchange data with the main control system through an Ethernet; meanwhile, each battery BMS in each energy storage unit is communicated with a corresponding energy storage current device, each energy storage current device exchanges data with a main coordination controller through an Ethernet, and the main coordination controller exchanges data with a main control station through a telemechanical device; the power grid dispatching center and the railway dispatching center exchange data with the main control system through the telemechanical device; the energy storage transformer and the traction station transformer exchange data with the main control system through the Ethernet; the comprehensive microcomputer protection of the electric iron power supply system exchanges data with the main control system through the telemechanical device.
A control method of an electric iron power supply system with an energy storage auxiliary service function comprises the following steps:
judging working state and identifying working mode: if the working state is the non-working state, carrying out fault discrimination and maintenance, and if the working state is the working state, carrying out the following steps after the working mode is identified;
railway network contact line has locomotive passing mode: when the monitoring network detects that a locomotive passes through a contact line of the railway network, the battery energy storage network provides electric energy for the locomotive at the moment and meets the electricity utilization requirement of the locomotive, and if the 35 kV-220 kV power network needs peak regulation, voltage regulation and frequency modulation auxiliary service and the battery energy storage network has the power required by the auxiliary service, the battery energy storage network provides auxiliary service for the 35 kV-220 kV power network at the same time;
railway network contact line locomotive-free passing mode: when the monitoring network detects that no locomotive passes through the contact line of the railway network, if the 35 kV-220 kV power grid needs auxiliary service and the battery energy storage network has the capacity of providing corresponding power, the battery energy storage network performs auxiliary service for the 35 kV-220 kV power grid, and if the 35 kV-220 kV power grid does not need auxiliary service, the 35 kV-220 kV power grid charges the battery energy storage network through a (small-capacity) transformer, and the battery energy storage network collects electric energy.
Preferably, in the contact wire locomotive pass mode: if the battery energy storage network cannot meet the requirement of supporting the locomotive due to faults and charge states, the battery energy storage network and a 35 kV-220 kV power grid jointly provide electric energy for the locomotive, and an auxiliary service function is terminated.
Preferably, the monitoring network monitors that the system meets the requirement when the locomotive passes through the contact line
Wherein P is For storing energy Removing available active power, P, from a battery energy storage network due to faults, battery state of charge and the like Locomotive with a wheel axle Active power required by the locomotive through the contact line; p (P) Transformer max The maximum value of active power output by a traction transformer in a traction power grid; p (P) Service requirements Active power required by frequency modulation and peak shaving is required for a 35 kV-220 kV power grid;
at this time, the battery energy storage network can supply power to the locomotive and simultaneously perform auxiliary service with the maximum capacity of the traction transformer, and the specific value is that
Wherein P is Storage device Active power, Q, provided for battery energy storage network Current transformer 、Q set Respectively setting values of reactive power and reactive power sent by PCS, P Power distribution network The exchange power between a 35 kV-220 kV power grid and a battery energy storage network, P Service Active power emitted/absorbed for auxiliary services of the battery storage network.
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network not only can meet locomotive load, but also can provide auxiliary service for a 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network not only can meet locomotive load, but also can provide auxiliary service for a 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
On the premise that the locomotive load is met, the remaining active power of the battery energy storage network provides auxiliary service for a power grid of 35 kV-220 kV, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network can meet the requirements of active power and reactive power of locomotive load, but due to the traction power grid fault (the traction power grid fault refers to the fault of traction substation equipment or the fault of 35 kV-220 kV power grid transmission line and equipment), auxiliary service cannot be carried out for the 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network meets the active power and reactive power demands of locomotive load, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network supplies power by taking the maximum power as the locomotive, and meanwhile, the locomotive operates at a speed limit, and the specific power value is
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network and the 35 kV-220 kV power grid jointly supply power for the locomotive, so that the active power and reactive power requirements of the locomotive are met, and the specific power value is
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network and the 35 kV-220 kV power grid jointly supply power for the locomotive, the power which can be maximally sent by the battery energy storage network and the 35 kV-220 kV power grid is used for supplying power for the locomotive load, and meanwhile, the locomotive is in speed-limiting operation, and the specific power value is
Preferably, when the contact wire inorganic vehicle passes, the monitoring network monitors that the system meets the following conditions:
no service is needed for 35 kV-220 kV power grid and traction power grid fault occurs (31)
At the moment, the battery energy storage network does not exchange power with the power grid, does not charge or discharge, and the specific power value is
When the monitoring network monitors that the system meets the following conditions
From formula (34), P Storage and need filling Removing the power of the energy storage unit left by the energy storage unit which stops running due to faults and the state of charge for the battery energy storage network; at the moment, the traction transformer of the 35 kV-220 kV power grid carries out small-current equalizing charge by taking the maximum power of the traction transformer as a battery energy storage network, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the traction transformer of the traction power grid performs equalizing charge on the battery energy storage network, and the specific power value is
When the monitoring network monitors that the system meets the following conditions
The 35 kV-220 kV power grid needs service and the traction power grid system fails (37)
At the moment, the battery energy storage network does not exchange power with a 35 kV-220 kV power grid, does not charge or discharge, and has the specific power value of
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, auxiliary service is provided for the traction transformer by using the maximum capacity of the traction transformer, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, so that auxiliary service is provided by the battery energy storage network, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, so that auxiliary service is provided by the battery energy storage network, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, and the maximum power which can be provided by the battery energy storage network is used for providing auxiliary service, and the specific power value is as follows
According to the electric iron power supply system with the energy storage auxiliary service function and the control method, the battery energy storage unit is utilized to directly supply power to the railway network, so that direct connection between a 35 kV-220 kV power grid and a DN traction network (the DN traction network is formed by a contact line, a return line and a track) in the traction power grid can be cut off, under the dispatching of a monitoring network, the battery energy storage network collects electric energy of the 35 kV-220 kV power grid through a small-capacity transformer, the influence of electric energy quality such as harmonic wave, negative sequence and power factor reduction on the 35 kV-220 kV power grid is avoided, and the peak regulation pressure of the power grid is reduced; the device ensures that stable, reliable, continuous and safe electric energy is provided for intermittent, high-power and extremely impact locomotive loads, and simultaneously absorbs the feedback power of locomotive braking. The 35 kV-220 kV power grid only charges the battery energy storage unit and is used as a backup power supply of the battery energy storage unit, so that the capacity of the traction transformer can be reduced, the overhead line and the traction transformer only need to be configured in a single set, secondary equipment related to the overhead line and the traction transformer is greatly reduced (compared with the existing double-set configuration of a traction transformer substation), a great amount of capacity electricity charge can be saved each year, equipment such as SVG, a comprehensive tide controller and the like can be omitted, project investment and later operation and maintenance cost can be greatly reduced, and further the return on investment period is shortened. At the position of
When the 35 kV-220 kV power grid needs auxiliary service, the battery energy storage network coordinates the response according to the dispatching of the monitoring network, and is
The 35 kV-220 kV power grid provides auxiliary services of frequency modulation, voltage regulation and peak regulation, and the related expense of the power grid is earned, so that a powerful situation with multiple purposes is realized. In addition, the electrified railway power supply system has the characteristics of simpler engineering operation, lower construction cost and the like.
The application is described in further detail below with reference to the accompanying drawings and specific examples.
Drawings
FIG. 1 is a topology diagram of a power supply mode of an electrified railway power supply system in the prior art;
fig. 2 is a topological structure diagram of the electric iron power supply system of the present embodiment;
fig. 3 is a schematic diagram of the structure of the monitoring network in this embodiment;
FIG. 4 is an electrical equivalent model of the present embodiment of the electric iron power system;
fig. 5 is a control flow chart of the electric iron power supply system of the present embodiment.
Detailed Description
Fig. 2 is a topological structure diagram of an electric iron power supply system of the embodiment, as shown in fig. 2, the electric iron power supply system with an energy storage auxiliary service function comprises a battery energy storage network 1, a traction power network 2, a railway network 3 and a monitoring network 4 for coordinating the power supply of the battery energy storage network 1, the traction power network 2 and the railway network 3, wherein the battery energy storage network 1 comprises a plurality of battery energy storage units 11 connected on a bus in parallel, the traction power network 2 inputs a high-voltage power network into a 27.5kV bus after reducing the voltage to supply power for the battery energy storage units 11, and the battery energy storage units 11 supply power for the railway network 3 through the 27.5kV bus.
In this embodiment, the traction power grid 2 includes a 35 kV-220 kV power grid 21, a power transmission line 22 and a traction transformer 23, where the 35 kV-220 kV power grid 21 continuously supplies power to the traction transformer 23 through the power transmission line 22, and the traction transformer 23 outputs a voltage drop of 35 kV-220 kV to a 27.5kV bus.
The railway network 3 comprises a contact line 31 connected with a 27.5kV busbar and a track 32, a return line 33 connected with the track 32, a locomotive 34 runs on the track 32, and the contact line 31, the return line 33 and the track 32 form a DN traction network.
The battery energy storage unit 11 includes a battery 111, an energy storage current device (PCS) 112 and a transformer 113 which are sequentially connected, and the transformer 113 specifically adopts split boost. The transformer 113 is connected with a 27.5kV bus; the battery 111, the energy storage current (PCS) 112 and the transformer 113 are all connected to the monitoring network 4 (indicated by dashed arrows in fig. 2). Under the dispatching of the monitoring network 4, the battery energy storage unit 11 collects electric energy of a 35 kV-220 kV power grid through the small-capacity transformer 113, provides stable, reliable, continuous and safe electric energy for the load of the locomotive 34, absorbs the feedback power of the braking of the locomotive 34, cuts off the direct connection between the 35 kV-220 kV power grid and the traction network, and avoids adverse effects such as damaged electric energy quality, reduced power factor and the like of the 35 kV-220 kV power grid.
The battery energy storage unit 11 adopts a modularized structure, and all components in the battery energy storage unit 11 are configured in the same shell. The modular structure facilitates the use of the battery energy storage units 11, and ensures that each battery energy storage unit 11 is mutually standby.
As shown in fig. 3, the monitoring network 4 includes a master control system, a master coordination controller, a telemechanical device, microcomputer protection, a switch, and the like. In order to ensure safe, reliable, stable and continuous operation of the battery energy storage network, the monitoring network 4 adopts double-set control. The information acquisition mode of one set of control system equipment is as follows: each PCS in each energy storage unit is communicated with a corresponding battery BMS, and all the battery BMSs exchange data with the main control system through the Ethernet. The other set of control system equipment acquisition mode is as follows: each battery BMS in each energy storage unit communicates with a corresponding PCS, each PCS exchanges data with a total coordination controller through an Ethernet, and the total coordination controller exchanges data with a main control station through a telemechanical device. And the power grid dispatching center and the railway dispatching center exchange data with the main control system through the telemechanical device. The energy storage transformer and the traction station transformer exchange data with the main control system through the Ethernet. The comprehensive microcomputer protection of the electrified railway power supply system exchanges data with the main control system through the telemechanical device.
Fig. 4 is an electrical equivalent model of an electrified railway power supply system, in which fig. 4 performs equivalent of the electrical models of the battery energy storage network 1, the railway network 3 and the traction power network 2, and the battery energy storage unit 11 performs electric equivalent of davien, U, by using a PCS ac side output port B1A 、U B1B 、U B1C For the first battery energy storage unit 11 Thevenin equivalent phase voltage, Z B1 For its equivalent virtual impedance, Z TB1 Is the equivalent impedance, i, of the transformer in the first battery energy storage unit 11 B1A 、i B1B 、i B1C The first battery energy storage unit 11 is charged with bus current, U BNA 、U BNB 、U BNC For the N-th battery energy storage unit 11 Thevenin equivalent phase voltage, Z BN Z is the equivalent virtual impedance of Thevenin TBN Is the NEquivalent impedance of the transformer in each battery energy storage unit 11, i BNA 、i BNB 、i BNC Injecting bus current into the Nth battery energy storage unit 11; u in traction of 35 kV-220 kV power grid GA 、U GB 、U GC Equivalent phase voltage of 35 kV-220 kV power grid equivalent infinite power supply, i GA 、i GB 、i GC Output current of power grid of 35 kV-220 kV, Z G Is equivalent internal resistance of infinite power supply, Z L For the equivalent impedance of the transmission line, U TA 、U TB 、U TC To pull the transformer port voltage, i TA 、i TB 、i TC To draw current from the transformer injection system, Z GT Equivalent impedance of the traction transformer; in the railway network, U AB 、i AB The voltage and injection current on the locomotive 34 on the contact line 31, Z TF1 For locomotive 34 load equivalent impedance, U CB 、i CB The voltage and injection current, Z, on the locomotive 34 on contact line 33, respectively TF2 Equivalent impedance for locomotive 34 load.
From fig. 4, the following power output/input conditions in each network can be deduced, and the specific conditions are shown in the formulas (1) to (12).
The active power provided by the 35 kV-220 kV power grid for the battery energy storage network 1 or the locomotive 34 is as follows
From equation (1), ψ is Electric network The power factor of the power grid is 35 kV-220 kV.
When the power grid of 35 kV-220 kV needs auxiliary service, the following relationship exists
P Electric network ＝-P Service (2)
Maximum output power of traction transformer is
Can be represented by the formula (3)U is known as TAN 、i TAN Rated voltage and rated current, respectively, of a traction transformer, ψ Traction For the power factor, eta of the traction transformer Traction Is the working efficiency of the traction transformer.
The active power exchanged between the battery energy storage unit 11 and the system is
From equation (4), ψ is Store 1 Is the power factor, η, of the PCS in the first battery energy storage unit 11 Store 1 Is the combined efficiency of the PCS and battery in the first battery energy storage unit 11.
The reactive power exchanged between the battery energy storage unit 11 and the system is
The active power exchanged between the Nth battery energy storage unit 11 and the system is
From equation (6), ψ is N storage Is the power factor, eta, of the PCS in the Nth battery energy storage unit 11 N storage The combined efficiency of the PCS and the battery in the nth battery energy storage unit 11.
Reactive power exchanged between the Nth battery energy storage unit 11 and the system is
The active power exchanged between the battery energy storage network 1 and the whole system can be obtained by combining the formula (4) and the formula (6) as follows
P For storing energy ＝P Store 1 +…+P Store M +…+P N storage (8)
By male meansAs can be seen from formula (8), P Store M Active power exchanged with system for Mth battery energy storage unit, P For storing energy To remove the sum of the remaining energy storage unit powers that are not required due to a fault, state of charge.
The reactive power exchanged between the battery energy storage network 1 and the whole system can be obtained by combining the formula (5) and the formula (7) as follows
Q Current transformer ＝Q Store 1 +…+Q Store M +…+Q N storage (9)
From equation (9), Q Store M Active power exchanged with system for Mth battery energy storage unit, Q For storing energy To eliminate the sum of reactive power of the remaining battery energy storage units which are not satisfied by faults and states of charge.
The active power dissipated by locomotive load on the first contact line 31 is
From equation (10), ψ is Locomotive 1 Is the power factor, eta, of the locomotive on the first contact line 31 Locomotive 1 Is the efficiency of the locomotive on the first contact line 31.
The active power dissipated by locomotive load on the second contact line 31 is
From equation (11), ψ is Locomotive 2 Is the power factor, eta, of the locomotive on the second contact line 31 Locomotive 2 Is the efficiency of the locomotive on the second contact line 31.
By combining the formula (10) and the formula (11), it is possible to obtain
P Locomotive with a wheel axle ＝P Locomotive 1 +P Locomotive 2 (12)
The control method of the electrified railway power supply system, as shown in fig. 5, comprises the following steps:
judging working state and identifying working mode: if the working state is the non-working state, carrying out fault discrimination and maintenance, and if the working state is the working state, carrying out the following steps after the working mode is identified;
railway network contact line has locomotive passing mode: when the monitoring network 4 detects that the locomotive 34 passes through the contact line 31 of the railway network 3, the battery energy storage network 1 provides electric energy for the locomotive 34 at the moment so as to meet the electricity utilization requirement of the locomotive 34, and if the 35 kV-220 kV power grid 21 needs peak regulation, voltage regulation and frequency modulation auxiliary service and the battery energy storage network 1 has the power required by the auxiliary service, the battery energy storage network 1 simultaneously provides the auxiliary service for the 35 kV-220 kV power grid 21; if the battery energy storage network 1 cannot meet the requirement of supporting the locomotive 34 due to faults and charge states, the battery energy storage network 1 and the 35 kV-220 kV power grid 21 jointly provide electric energy for the locomotive 34, and the auxiliary service function is terminated.
Railway network contact line locomotive-free passing mode: when the monitoring network 4 detects that the inorganic vehicle 34 passes through the contact line 31 of the railway network 3, if the 35 kV-220 kV power grid 21 needs auxiliary service and the battery energy storage network 1 has the capacity of providing corresponding power, the battery energy storage network 1 performs auxiliary service for the 35 kV-220 kV power grid 21, and if the 35 kV-220 kV power grid 21 does not need auxiliary service at this time, the 35 kV-220 kV power grid 21 charges the battery energy storage network through the small-capacity transformer 23, and the battery energy storage network collects electric energy.
When the contact wire 31 passes the locomotive 34, the monitoring network 4 monitors that the system meets the requirements
Wherein P is For storing energy Removing available active power, P, from a battery energy storage network due to faults, battery state of charge and the like Locomotive with a wheel axle Active power required by the locomotive through the contact line; p (P) Transformer max The maximum value of active power output by a traction transformer in a traction power grid; p (P) Service requirements Active power required by frequency modulation and peak shaving is required for a 35 kV-220 kV power grid;
at this time, the battery energy storage network can supply power to the locomotive and simultaneously perform auxiliary service with the maximum capacity of the traction transformer, and the specific value is that
Wherein P is Storage device Active power, Q, provided for battery energy storage network Current transformer 、Q set Respectively setting values of reactive power and reactive power sent by PCS, P Power distribution network The exchange power between a 35 kV-220 kV power grid and a battery energy storage network, P Service Active power emitted/absorbed for auxiliary services of the battery storage network.
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network not only can meet locomotive load, but also can provide auxiliary service for a 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network not only can meet locomotive load, but also can provide auxiliary service for a 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
On the premise that the locomotive load is met, the remaining active power of the battery energy storage network provides auxiliary service for a power grid of 35 kV-220 kV, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network can meet the requirements of active power and reactive power of locomotive load, but due to the traction power grid fault (the traction power grid fault refers to the fault of traction substation equipment or the fault of 35 kV-220 kV power grid transmission line and equipment), auxiliary service cannot be carried out for the 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network meets the active power and reactive power demands of locomotive load, and the specific power value is as follows
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When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network supplies power by taking the maximum power as the locomotive, and meanwhile, the locomotive operates at a speed limit, and the specific power value is
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network and the 35 kV-220 kV power grid jointly supply power for the locomotive, so that the active power and reactive power requirements of the locomotive are met, and the specific power value is
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network and the 35 kV-220 kV power grid jointly supply power for the locomotive, the power which can be maximally sent by the battery energy storage network and the 35 kV-220 kV power grid is used for supplying power for the locomotive load, and meanwhile, the locomotive is in speed-limiting operation, and the specific power value is
When no locomotive passes through the contact line, the monitoring network monitors that the system meets the following conditions:
no service is needed for the 35 kV-220 kV power grid and the traction power grid fails (31)
At the moment, the battery energy storage network does not exchange power with the power grid, does not charge or discharge, and the specific power value is
When the monitoring network monitors that the system meets the following conditions
From formula (34), P Storage and need filling Removing the power of the energy storage unit left by the energy storage unit which stops running due to faults and the state of charge for the battery energy storage network; at the moment, the traction transformer of the 35 kV-220 kV power grid carries out small-current equalizing charge by taking the maximum power of the traction transformer as a battery energy storage network, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the traction transformer of the traction power grid performs equalizing charge on the battery energy storage network, and the specific power value is
When the monitoring network monitors that the system meets the following conditions
35 kV-220 kV power grid needs service and traction power grid system fault (37)
At the moment, the battery energy storage network does not exchange power with a 35 kV-220 kV power grid, does not charge or discharge, and has the specific power value of
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, auxiliary service is provided for the traction transformer by using the maximum capacity of the traction transformer, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, so that auxiliary service is provided by the battery energy storage network, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, so that auxiliary service is provided by the battery energy storage network, and the specific power value is as follows
When the monitoring network monitors that the system meets the following conditions
/>
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, and the maximum power which can be provided by the battery energy storage network is used for providing auxiliary service, and the specific power value is as follows
According to the electrified railway power supply system and the control method, the battery energy storage unit 1 is utilized to directly supply power to the railway network 3, so that direct connection between a 35 kV-220 kV power grid 21 in the traction power grid 2 and a DN traction network (the DN traction network is formed by a contact line, a return line and a track) can be cut off, under the dispatching of the monitoring network 4, the battery energy storage unit 1 collects electric energy of the 35 kV-220 kV power grid through the small-capacity transformer 113, the influence of electric energy quality such as harmonic wave, negative sequence and power factor reduction on the 35 kV-220 kV power grid is avoided, and the peak regulation pressure of the power grid is reduced; the intermittent, high-power and highly impact locomotive load is ensured to be provided with stable, reliable, continuous and safe electric energy, and the feedback power of the locomotive 34 brake can be absorbed. The 35 kV-220 kV power grid 21 only charges the battery energy storage unit 11 and is used as a backup power supply of the battery energy storage unit 11, so that the capacity of the traction transformer can be reduced, the overhead line and the traction transformer only need to be configured in a single set, secondary equipment related to the overhead line and the traction transformer is greatly reduced (compared with the existing double-set configuration of the traction transformer substation), and the cost is greatly reduced. When the 35 kV-220 kV power grid needs auxiliary service, the battery energy storage network coordinates the response according to the dispatching of the monitoring network, provides auxiliary service of frequency modulation, voltage regulation and peak regulation for the 35 kV-220 kV power grid, earns relevant expense of the power grid, and achieves a powerful situation of multiple purposes.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
Claims (3)
1. A control method of an electric iron power supply system with an energy storage auxiliary service function is characterized by comprising the following steps of: the system comprises an electric iron power supply system with an energy storage auxiliary service function, wherein the electric iron power supply system comprises a battery energy storage network, a traction power grid, a railway network and a monitoring network for coordinating the power supply of the battery energy storage network, the traction power grid and the railway network, the battery energy storage network comprises a plurality of battery energy storage units connected in parallel on a bus, the traction power grid is used for inputting the high-voltage power grid into the bus after reducing the voltage to supply power for the battery energy storage units, and the battery energy storage units are used for supplying power for the railway network through the bus;
the traction power grid comprises a 35 kV-220 kV power grid, a power transmission line and a traction transformer, wherein the 35 kV-220 kV power grid continuously supplies power to the traction transformer through the power transmission line, and the traction transformer outputs the voltage of the 35 kV-220 kV to a 27.5kV bus after the voltage is reduced to 27.5 kV;
the railway network comprises a contact line and a track which are connected with a 27.5kV bus, a return line which is connected with the track, and a locomotive runs on the track;
the battery energy storage unit comprises a battery, an energy storage converter and a transformer which are sequentially connected, and the transformer is connected with the bus; the battery, the energy storage converter and the transformer are all connected with a monitoring network; the battery energy storage unit is of a modularized structure, and all components in the battery energy storage unit are arranged in the same shell;
the monitoring network comprises a main control system, a main coordination controller, a telemechanical device, microcomputer protection and a switch; each energy storage converter in each energy storage unit is communicated with a corresponding battery BMS, and all the battery BMSs exchange data with the main control system through an Ethernet; meanwhile, each battery BMS in each energy storage unit is communicated with a corresponding energy storage converter, each energy storage converter exchanges data with a main coordination controller through an Ethernet, and the main coordination controller exchanges data with a main control station through a telemechanical device; the power grid dispatching center and the railway dispatching center exchange data with the main control system through the telemechanical device; the energy storage transformer and the traction station transformer exchange data with the main control system through the Ethernet; the comprehensive microcomputer protection of the electric iron power supply system exchanges data with the main control system through the telemechanical device;
the control method of the electric iron power supply system comprises the following steps:
judging working state and identifying working mode: if the working state is the non-working state, carrying out fault discrimination and maintenance, and if the working state is the working state, carrying out the following steps after the working mode is identified;
railway network contact line has locomotive passing mode: when the monitoring network detects that a locomotive passes through a contact line of the railway network, the battery energy storage network provides electric energy for the locomotive at the moment and meets the electricity utilization requirement of the locomotive, and if the 35 kV-220 kV power network needs peak regulation, voltage regulation and frequency modulation auxiliary service and the battery energy storage network has the power required by the auxiliary service, the battery energy storage network provides auxiliary service for the 35 kV-220 kV power network at the same time; if the battery energy storage network cannot meet the requirement of supporting the locomotive due to faults and charge states, the battery energy storage network and a 35 kV-220 kV power grid jointly provide electric energy for the locomotive, and an auxiliary service function is terminated;
railway network contact line locomotive-free passing mode: when the monitoring network detects that no locomotive passes through the contact line of the railway network, if the 35 kV-220 kV power grid needs auxiliary service and the battery energy storage network has the capacity of providing corresponding power, the battery energy storage network performs auxiliary service for the 35 kV-220 kV power grid, and if the 35 kV-220 kV power grid does not need auxiliary service, the 35 kV-220 kV power grid charges the battery energy storage network through a small-capacity transformer, and the battery energy storage network collects electric energy.
2. The method for controlling an electric iron power supply system with an energy storage auxiliary service function as set forth in claim 1, wherein: when the locomotive passes through the contact line, the monitoring network monitors that the system meets the following conditions
Wherein,P for storing energy Removing active power, P, from the battery energy storage network which remains available due to faults, battery state of charge Locomotive with a wheel axle Active power required by the locomotive through the contact line; p (P) Transformer max The maximum value of active power output by a traction transformer in a traction power grid; p (P) Service requirements Active power required by frequency modulation and peak shaving is required for a 35 kV-220 kV power grid;
at this time, the battery energy storage network can supply power to the locomotive and simultaneously perform auxiliary service with the maximum capacity of the traction transformer, and the specific value is that
Wherein P is Storage device Active power, Q, provided for battery energy storage network Current transformer 、Q set Respectively setting values of reactive power and reactive power sent by PCS, P Power distribution network The exchange power between a 35 kV-220 kV power grid and a battery energy storage network, P Service Active power emitted/absorbed for auxiliary services of the battery energy storage network;
when the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network not only can meet locomotive load, but also can provide auxiliary service for a 35 kV-220 kV power grid, and the specific power value is as follows
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network not only can meet locomotive load, but also can provide auxiliary service for a 35 kV-220 kV power grid, and the specific power value is as follows
；
When the monitoring network detects that the system meets the following conditions
On the premise that the locomotive load is met, the remaining active power of the battery energy storage network provides auxiliary service for a power grid of 35 kV-220 kV, and the specific power value is as follows
；
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network can meet the active power and reactive power requirements of locomotive load, but auxiliary service cannot be carried out for a 35 kV-220 kV power grid due to traction power grid faults, and the specific power value is as follows
；
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network meets the active power and reactive power demands of locomotive load, and the specific power value is as follows
；
When the monitoring network detects that the system meets the following conditions
At this time, the battery energy storage network supplies power by taking the maximum power as the locomotive, and meanwhile, the locomotive operates at a speed limit, and the specific power value is
；
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network and the 35 kV-220 kV power grid jointly supply power for the locomotive, so that the active power and reactive power requirements of the locomotive are met, and the specific power value is
；
When the monitoring network detects that the system meets the following conditions
At the moment, the battery energy storage network and the 35 kV-220 kV power grid jointly supply power for the locomotive, the power which can be maximally sent by the battery energy storage network and the 35 kV-220 kV power grid is used for supplying power for the locomotive load, and meanwhile, the locomotive is in speed-limiting operation, and the specific power value is
。
3. The method for controlling an electric iron power supply system with an energy storage auxiliary service function as set forth in claim 1, wherein:
when no locomotive passes through the contact line, the monitoring network monitors that the system meets the following conditions:
no service is needed for 35 kV-220 kV power grid and traction power grid fault occurs
At the moment, the battery energy storage network does not exchange power with the power grid, does not charge or discharge, and the specific power value is
；
When the monitoring network monitors that the system meets the following conditions
Wherein P is Storage and need filling Removing the power of the energy storage unit left by the energy storage unit which stops running due to faults and the state of charge for the battery energy storage network; at the moment, the traction transformer of the 35 kV-220 kV power grid carries out small-current equalizing charge by taking the maximum power of the traction transformer as a battery energy storage network, and the specific power value is as follows
；
When the monitoring network monitors that the system meets the following conditions
At the moment, the traction transformer of the traction power grid performs equalizing charge on the battery energy storage network, and the specific power value is
；
When the monitoring network monitors that the system meets the following conditions
The 35 kV-220 kV power grid needs service and the traction power grid system fails
At the moment, the battery energy storage network does not exchange power with a 35 kV-220 kV power grid, does not charge or discharge, and has the specific power value of
；
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, auxiliary service is provided for the traction transformer by using the maximum capacity of the traction transformer, and the specific power value is as follows
；
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, so that auxiliary service is provided by the battery energy storage network, and the specific power value is as follows
；
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, so that auxiliary service is provided by the battery energy storage network, and the specific power value is as follows
；
When the monitoring network monitors that the system meets the following conditions
At the moment, the battery energy storage network exchanges power with a 35 kV-220 kV power grid, and the maximum power which can be provided by the battery energy storage network is used for providing auxiliary service, and the specific power value is as follows
。
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| CN202046214U (en) * | 2011-05-09 | 2011-11-23 | 株洲变流技术国家工程研究中心有限公司 | Energy-fed traction power supply device |
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| CN202046214U (en) * | 2011-05-09 | 2011-11-23 | 株洲变流技术国家工程研究中心有限公司 | Energy-fed traction power supply device |
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