CN113497460B - Distributed power generation system connected to traction substation and control method - Google Patents
Distributed power generation system connected to traction substation and control method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 208
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004146 energy storage Methods 0.000 claims description 149
- 238000005259 measurement Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 25
- 229910052739 hydrogen Inorganic materials 0.000 claims description 25
- 239000001257 hydrogen Substances 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 23
- 229910052744 lithium Inorganic materials 0.000 claims description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 239000013307 optical fiber Substances 0.000 claims description 19
- 239000013256 coordination polymer Substances 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 11
- 238000005868 electrolysis reaction Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001172 regenerating 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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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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- 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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/30—The power source being a fuel cell
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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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Abstract
The invention provides a distributed power generation system connected to a traction substation and a control method, and belongs to the technical field of traction power supply of electrified railways. The traction side of the in-phase traction substation is connected with a traction bus, the traction bus is connected with a traction network through a feeder, a new energy power generation device arranged in a corridor along a railway is connected into the traction bus of the traction substation through a power cable, a central coordination controller arranged in a traction way monitors the power condition of the traction network in real time, the output power of the new energy power generation device is dynamically controlled, and the optimal utilization of the new energy power is realized. The method is mainly used for power scheduling and management of the distributed power generation system connected to the traction substation.
Description
Technical Field
The invention relates to the technical field of alternating current electrified railway power supply, in particular to a distributed power generation system connected to a traction substation and a control method.
Background
A large number of successful application cases of new energy and renewable energy power generation in a power system exist, and a railway system is also under initial exploration. New energy and renewable energy are popularized and applied to power generation along the railway according to principles of local conditions, multi-energy complementation and the like.
The chinese application No. 202110028103.9 discloses an in-phase traction power supply and remote power generation grid-connected system and a control method, but this application only considers single-point remote power generation, does not consider the situation that railway lines are linearly distributed and multiple power generation systems coexist, and does not relate to how to connect multiple distributed power generation systems into a traction power supply system, and cannot connect all distributed new energy and renewable energy power generation devices into a traction substation, and therefore, how to connect multiple new energy and renewable energy power generation devices which are distributed to a traction substation becomes a problem worthy of research.
Related documents propose a power generation and energy storage scheme in which a new energy power generation device and an energy storage device are connected in parallel on a direct current bus, and the scheme is used in the field of alternating current traction power supply and reduces the utilization efficiency of the generated power of the new energy power generation device to the traction load power supply.
The distributed new energy and renewable energy power generation device is connected to a traction network, and a complex connection structure and a control method are involved. When new energy power generation power and traction station power exist at the same time, how to control and use the new energy power generation power and the traction station power so as to meet the requirement of new energy consumption nearby, reduce the phenomena of 'wind abandoning and light abandoning', improve the new energy power generation utilization rate, and also is a problem to be solved urgently after the new energy power generation device is connected to the grid. The invention provides a new system, wherein new energy power generation devices distributed along the railway trend are connected with a power cable nearby and on the spot, the power cable is connected with a traction bus of a traction substation through a feeder line, and meanwhile, a plurality of new energy power generation devices can be controlled by adopting a central coordination controller.
Disclosure of Invention
The invention aims to provide a distributed power generation system connected to a traction substation, which can effectively solve the technical problem that a distributed new energy power generation device is connected to a traction power supply system.
The purpose of the invention is realized by the following technical scheme: a distributed power generation system connected into a traction substation comprises a traction substation TS and a traction network, wherein the traction side of the traction substation TS is respectively connected with a traction bus TB1 and a traction bus TB2 through conducting wires, the traction bus TB1 is connected with the R line of the traction network through a feeder TF1, the traction bus TB2 is connected with the T line of the traction network through a feeder TF2, a voltage transformer PT is arranged between the traction bus TB1 and the traction bus TB2, the feeder TF2 is provided with a current transformer CT1, a power cable CP line and a power cable CN line are laid in parallel along the railway direction, and n new energy power generation devices are arranged along the power cable CP line and specifically marked as a new energy power generation device G1, a new energy power generation device G2, new energy power generation devices Gi, … and a new energy power generation device Gn; the positive electrode of the new energy power generation device Gi is connected with a nearby power cable CP line through a feeder GPi, and the negative electrode of the new energy power generation device Gi is connected with a nearby power cable CN line through a feeder GNi; the power cable CP line and the power cable CN line are respectively connected with a traction bus TB2 and a traction bus TB1 through a feeder line TG2 and a feeder line TG1 at a traction substation TS, and the feeder line TG2 is provided with a current transformer CT 2; the traction substation TS is provided with a central coordination controller CCC, the measurement and control end of the central coordination controller CCC is respectively connected with the measurement and control ends of a new energy power generation device G1, a new energy power generation device G2, new energy power generation devices Gi and … and a new energy power generation device Gn through an optical fiber pair sA1, an optical fiber pair sA2, optical fiber pairs sAi and … and an optical fiber pair sAn, and the measurement and control end of a voltage transformer PT, the measurement end of a current transformer CT1 and the measurement end of the current transformer CT2 are connected with the input end of the central coordination controller CCC; wherein n is more than or equal to 2, i =1,2,3, …, n.
The new energy power generation device G1, the new energy power generation device G2, the new energy power generation devices Gi and … and the new energy power generation device Gn are one or more of a photovoltaic power generation system, a hydrogen energy power generation system, a wind power generation system and biochemical energy power generation.
An energy storage device TES is arranged at the position of the traction substation TS, the energy storage device TES is respectively connected with a traction bus TB1 and a traction bus TB2, and a measurement and control end of a central coordination controller CCC is connected with a measurement and control end of the energy storage device TES through an optical fiber pair sES.
The energy storage device TES comprises a single-phase energy storage transformer, a single-phase energy storage converter, a direct current bus, a fuel cell direct current converter, an electrolyzed water hydrogen production energy storage unit and a fuel cell power generation unit; two ends of the high-voltage side of the single-phase energy storage transformer are respectively connected with a traction bus TB1 and a traction bus TB2, the low-voltage side of the single-phase energy storage transformer is connected with the alternating-current side of the single-phase energy storage converter, and the direct-current side of the single-phase energy storage converter is connected with the direct-current bus; one side of the electrolyzed water direct-current converter is connected with the direct-current bus, and the other side of the electrolyzed water direct-current converter is connected with the electrolyzed water hydrogen production energy storage unit; one side of the fuel cell DC-DC converter is connected with the DC bus, and the other side of the fuel cell DC-DC converter is connected with the fuel cell power generation unit; and the hydrogen stored in the water electrolysis hydrogen production energy storage unit is supplied to the fuel cell power generation unit.
The energy storage device TES further comprises a super-capacitor direct-current converter, a lithium battery direct-current converter, a super-capacitor energy storage unit and a lithium battery energy storage unit; one side of the super capacitor DC-DC converter is connected with a DC bus, and the other side of the super capacitor DC-DC converter is connected with the super capacitor energy storage unit; one side of the lithium battery direct-current converter is connected with the direct-current bus, and the other side of the lithium battery direct-current converter is connected with the lithium battery energy storage unit.
The invention also aims to provide a control method of the distributed power generation system connected to the traction substation, which can effectively solve the technical problem of controlling the new energy power generation device to be connected with a traction power supply system in a grid mode.
The purpose of the invention is realized by the following technical scheme: a control method for a distributed power generation system connected to a traction substation comprises the following steps:
the CCC judges whether a failed new energy power generation device exists or not, and controls the failed new energy power generation device to quit the operation if the failed new energy power generation device exists; the CCC controls the new energy power generation device under normal working conditions to independently and autonomously generate power and operate.
The independent and autonomous power generation operation of the new energy power generation device under the normal working condition controlled by the CCC comprises the following steps:
the method comprises the steps that a central coordination controller CCC obtains a voltage signal measured by a voltage transformer PT and a first current signal measured by a current transformer CT 1; calculating traction network power P1 according to the obtained voltage signal and the first current signal, wherein the traction network power P1 is traction power when flowing to the traction network, and is recorded as positive, and the active power is feedback power when flowing to the traction substation TS, and is recorded as negative; and the central coordination controller CCC controls the output power Pm of the new energy power generation device according to the traction grid power P1.
The step of controlling the output power Pm of the new energy power generation device according to the traction grid power P1 comprises the following steps:
when the power P1 of the traction network is negative, if the electric power department allows the rest of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmmax); if the electric power department does not allow the residual electricity of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtSS, Pmmax); wherein PtN is the rated power of the traction substation TS, Pmmax is the maximum power generation power of the new energy power generation device, and PtSS is the instant energy storage power of the energy storage device TES; min (#) represents the minimum value;
when the power P1 of the traction network is positive, if the electric power department allows the rest of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmmax); if the electric power department does not allow the residual electricity of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (P1 + PtSS, Pmmmax);
the energy storage device TES immediate energy storage power PtSS is determined by:
wherein,
rated power of the energy storage unit of the lithium battery,
Rated power of the super capacitor energy storage unit,
Rated power of the energy storage unit for hydrogen production by water electrolysis; wherein,
the working state of a TES (storage energy System) of the energy storage device is obtained by a CCC (Central coordination controller) as a binary function, and when the energy storage unit of the lithium battery has energy storage capacity, the working state is set
Is 1, and vice versa
Is 0; when the super capacitor energy storage unit has energy storage capacity, setting
Is 1, and vice versa
Is 0; when the energy storage unit for hydrogen production by water electrolysis has energy storage capacity, the device is arranged
Is 1, and vice versa
Is 0.
The control method further comprises the following steps: the CCC acquires a second current signal measured by the current transformer CT 2;
calculating the actual emitted power P2 of the new energy power generation device according to the acquired voltage signal and the second current signal;
and judging whether the actual generated power P2 of the new energy power generation device meets the requirement, and if not, adjusting the actual generated power P2 of the new energy power generation device.
The control method further comprises the following steps: the CCC controls the energy storage device TES to operate under the working conditions of energy storage or energy release according to the acquired voltage information, the acquired first current information and the acquired second current information;
when the power P1 of the traction network is negative, if the electric power department does not allow the rest of the power of the traction power supply system to be on line, controlling the TES energy storage device to operate under the energy storage working condition; if the electric power department allows the residual electricity of the traction power supply system to be on line, and when PtN + P1 is less than Pmmax, controlling the energy storage device TES to operate under an energy storage working condition;
when the power P1 of the traction network is positive, if the electric power department does not allow the rest of the power of the traction power supply system to be on line, and when P1< Pmmax, controlling the TES energy storage device to operate under the energy storage working condition; if the electric power department allows the rest power of the traction power supply system to be on line, and when PtN + P1 is less than Pmmax, controlling the energy storage device TES to operate under an energy storage working condition;
when the power P1 of the traction network is positive, and when P1> Pref > Pmmax, controlling the TES to operate in an energy release working condition; wherein Pref is a peak clipping power threshold of the traction substation TS.
The working principle of the invention is as follows: the characteristics of new energy and renewable energy distribution along a corridor along a railway are combined, a plurality of new energy generation devices are connected into a special traction cable in a distributed mode, and the traction cable is connected into a traction substation in a centralized mode. By monitoring the load power of the electric locomotive in real time, the new energy power generation device is dynamically controlled to actually generate power, the new energy power generation power is preferentially used, and the traction station power is used, so that the new energy can be consumed nearby, the phenomena of 'wind abandoning and light abandoning' are reduced, and the train renewable electric energy utilization rate and the new energy and renewable energy power generation utilization rate are improved.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the condition that a railway line is distributed in the current situation and a plurality of power generation systems coexist, the invention adopts a special traction cable to connect a plurality of new energy generation devices into a traction substation in a distributed manner, and the traction substation is connected in a centralized manner through the special traction cable, thereby solving the problem that how to connect a plurality of distributed power generation systems into a traction power supply system cannot connect all distributed new energy and renewable energy power generation devices into the traction substation.
Secondly, by monitoring the load power of the electric locomotive in real time, the new energy power generation device is dynamically controlled to actually send out power, the new energy power generation power is preferentially used, and then the traction station power is used, so that the new energy can be consumed nearby, the phenomena of 'wind abandon and light abandon' are reduced, and the train regenerative electric energy utilization rate and the new energy and renewable energy power generation utilization rate are improved.
And thirdly, the new energy power generation device is connected with the storage device in parallel on the traction bus, and the new energy power generation can directly supply power to the alternating current traction load, so that the utilization efficiency of the new energy power generation can be effectively improved.
Drawings
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a schematic view of the TES energy storage device of the present invention.
FIG. 3 is a flow chart of a control method according to the present invention.
In fig. 2, the references referred to are respectively: the system comprises a 1-single-phase energy storage transformer, a 2-single-phase energy storage converter, a 3-direct current bus, a 4-super capacitor direct current converter, a 5-super capacitor energy storage unit, a 6-lithium battery direct current converter, a 7-lithium battery energy storage unit, an 8-fuel battery direct current converter, a 9-fuel battery power generation unit, a 10-electrolyzed water direct current converter and a 11-electrolyzed water hydrogen production energy storage unit.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will further describe the present invention with reference to the accompanying drawings and the detailed description.
Example 1
As shown in fig. 1, the embodiment provides a distributed power generation system connected to a traction substation, which includes a traction substation TS and a traction network, a traction side of the traction substation TS is connected to a traction bus TB1 and a traction bus TB2, the traction bus TB1 is connected to an R line of the traction network through a feeder line TF1, the traction bus TB2 is connected to a T line of the traction network through a feeder line TF2, a voltage transformer PT is provided between the traction bus TB1 and the traction bus TB2, the feeder line TF2 is provided with a current transformer CT1, a power cable CP line and a power cable CN line are laid in parallel along a railway, and n new energy power generation devices are provided along the power cable CP line, and are specifically marked as a new energy power generation device G1, a new energy power generation device G2, a new energy power generation device Gi, a new energy power generation device Gn … and a new energy power generation device;
the traction substation TS is provided with a central coordination controller CCC, the measurement and control end of the central coordination controller CCC is respectively connected with the measurement and control ends of a new energy power generation device G1, a new energy power generation device G2, new energy power generation devices Gi and … and a new energy power generation device Gn through an optical fiber pair sA1, an optical fiber pair sA2, optical fiber pairs sAi and … and an optical fiber pair sAn, and the measurement and control end of a voltage transformer PT, the measurement end of a current transformer CT1 and the measurement end of the current transformer CT2 are connected with the input end of the central coordination controller CCC; wherein n is more than or equal to 2, i =1,2,3, …, n. The positive electrode of the new energy power generation device G1 is connected with a nearby power cable CP line through a feeder GP1, the negative electrode of the new energy power generation device G2 is connected with a nearby power cable CN line through a feeder GN1, the positive electrode of the new energy power generation device G2 is connected with the nearby power cable CP line through a feeder GP2, the negative electrode of the new energy power generation device G2 is connected with the nearby power cable CN line through a feeder GN2, …, the positive electrode of the new energy power generation device Gn is connected with the nearby power cable CP line through a feeder GPn, the negative electrode of the new energy power generation device Gn is connected with the nearby power cable CN line through a feeder GNn, the power cable CP line and the power cable CN line are respectively connected with a traction bus TB2 and a traction bus TB1 through a feeder TG2 and a feeder TG1 at a traction substation TS, and the feeder TG2 is provided with a current transformer CT 2;
the traction substation TS is provided with a central coordination controller CCC, the measurement and control end of the central coordination controller CCC is respectively connected with the measurement and control ends of a new energy power generation device G1, a new energy power generation device G2, new energy power generation devices Gi and … and a new energy power generation device Gn through an optical fiber pair sA1, an optical fiber pair sA2, optical fiber pairs sAi and … and an optical fiber pair sAn, and the measurement and control end of a voltage transformer PT, the measurement end of a current transformer CT1 and the measurement end of the current transformer CT2 are connected with the input end of the central coordination controller CCC; wherein n is more than or equal to 2.
In this embodiment, the R line of traction net can ground connection, and each new energy power generation facility moves towards the setting along the railway according to actual conditions, and for the convenience of access, this embodiment adopts the principle of being in the spot nearby to insert each new energy power generation facility power cable.
Preferably, the new energy power generation device G1, the new energy power generation device G2, the new energy power generation devices Gi and … and the new energy power generation device Gn are one or more of a photovoltaic power generation system, a wind power generation system and biochemical energy power generation.
Here, the new energy power generation device G1 may be one or more of a photovoltaic power generation system, a wind power generation system, and biochemical power generation, the new energy power generation device G2 may be one or more of a photovoltaic power generation system, a wind power generation system, and biochemical power generation, the new energy power generation device Gi may be one or more of a photovoltaic power generation system, a wind power generation system, and biochemical power generation, …, and the new energy power generation device Gn may be one or more of a photovoltaic power generation system, a wind power generation system, and biochemical power generation.
Preferably, an energy storage device TES is arranged at the traction substation TS, the energy storage device TES is connected with a traction bus TB1 and a traction bus TB2, and a measurement and control end of the central coordination controller CCC is connected with a measurement and control end of the energy storage device TES through an optical fiber pair sES.
As shown in fig. 2, the energy storage device TES in this embodiment includes a single-phase energy storage transformer 1, a single-phase energy storage converter 2, a dc bus 3, a fuel cell dc-dc converter 8, an electrolyzed water dc-dc converter 10, an electrolyzed water hydrogen production energy storage unit 11, and a fuel cell power generation unit 9; two ends of the high-voltage side of the single-phase energy storage transformer 1 are respectively connected with a traction bus TB1 and a traction bus TB2, the low-voltage side of the single-phase energy storage transformer 1 is connected with the alternating-current side of the single-phase energy storage converter 2, and the direct-current side of the single-phase energy storage converter 2 is connected with the direct-current bus 3; one side of the electrolyzed water direct-current converter 10 is connected with the direct-current bus 3, and the other side is connected with the electrolyzed water hydrogen production energy storage unit 11; one side of the fuel cell DC-DC converter 8 is connected with the DC bus 3, and the other side is connected with the fuel cell power generation unit 9; the hydrogen stored in the water electrolysis hydrogen production energy storage unit 11 is supplied to the fuel cell power generation unit 9.
When implementing this embodiment, combine electrolytic water hydrogen production energy storage unit 11 and fuel cell power generation unit 9, on the one hand can realize the energy storage effect through electrolytic water hydrogen production energy storage unit 11, and on the other hand can utilize the hydrogen that electrolytic water hydrogen production energy storage unit 11 produced to provide fuel for fuel cell power generation unit 9, realizes the electricity generation and provides the effect of electric energy to improve energy utilization.
Preferably, the energy storage device TES further comprises a super capacitor dc-dc converter 4, a lithium battery dc-dc converter 6, a super capacitor energy storage unit 5 and a lithium battery energy storage unit 7; one side of the super capacitor DC-DC converter 4 is connected with the DC bus 3, and the other side is connected with the super capacitor energy storage unit 5; one side of the lithium battery DC-DC converter 6 is connected with the DC bus 3, and the other side is connected with the lithium battery energy storage unit 7.
In this embodiment, the energy storage device TES disposed in the traction substation TS may be a combination of some of the hydrogen production energy storage unit 11, the fuel cell power generation unit 9, the super capacitor energy storage unit 5, the lithium battery energy storage unit 7, and the corresponding linear-to-linear converter, or may include all of the energy storage units, the fuel cell power generation unit 9, and the corresponding linear-to-linear converter.
In this embodiment, the traction substation TS is set as an in-phase traction substation, which can extend the power supply distance and improve the utilization of the regenerated electric energy of the train, and the new energy power generation device G1, the new energy power generation device G2, the new energy power generation devices Gi and …, and the new energy power generation device Gn are connected, which can improve the utilization rates of new energy and renewable energy, and reduce the phenomena of wind abandonment, light abandonment, and the like of wind and light new energy and renewable energy. It should be further noted that the traction substation TS is one of a single-phase in-phase, a single-combined in-phase, and a single-combined in-phase. The arrangement of the in-phase traction substation is reasonably selected according to the condition of an external power supply. According to the requirement of GB/T15543-: when the power grid normally operates, the negative sequence voltage unbalance degree does not exceed 2%, and the short-time negative sequence voltage unbalance degree does not exceed 4%. The negative sequence voltage imbalance tolerance for each user at the point of common connection is typically 1.3% and for short does not exceed 2.6%. And the degree of imbalance of the three-phase voltage of the traction load can be described by the ratio of the negative sequence power to the short-circuit capacity of the power system of the public connection point. Therefore, when the traction load is constant, the short-circuit capacity of the power system directly determines the voltage imbalance level. If the external power supply has large short-circuit capacity, the single-phase in-phase power supply is adopted, so that the power quality requirement mainly based on the negative sequence can be met; if the short-circuit capacity of the external power supply is small and the single-phase in-phase power supply cannot meet the power quality requirement, the combined type in-phase power supply (refer to a single-phase combined type in-phase power supply and transformation structure disclosed in patent document 201310227591.1) can be adopted, the power quality is compensated to be within the national standard range, the single-single combined type in-phase power supply is recommended, and the single-three combined type in-phase power supply and transformation device can be considered when existing conditions are utilized (refer to a single-phase three-phase combined type in-phase power supply and transformation device disclosed in patent document 201210583674).
Example 2
As shown in fig. 3, this embodiment provides a control method for a distributed power generation system connected to a traction substation based on the control method provided in embodiment 1, which is applied to a central coordination controller CCC, and is implemented by the following technical solutions, specifically involving the following steps:
step S1: the CCC judges whether a failed new energy power generation device exists or not, and controls the failed new energy power generation device to quit the operation if the failed new energy power generation device exists;
step S2: the CCC controls the new energy power generation device under normal working conditions to independently and autonomously generate power and operate.
Preferably, as shown in fig. 3, the central coordination controller CCC controls the new energy power generator under normal operating condition to independently and autonomously generate power, that is, step S2 includes:
step S21: the method comprises the steps that a central coordination controller CCC obtains a voltage signal measured by a voltage transformer PT and a first current signal measured by a current transformer CT 1;
step S22: calculating traction network power P1 according to the obtained voltage signal and the first current signal, wherein the traction network power P1 is traction power when flowing to the traction network, and is recorded as positive, and the active power is feedback power when flowing to the traction substation TS, and is recorded as negative;
step S23: and controlling the output power Pm of the new energy power generation device according to the traction grid power P1.
Preferably, the step S23 of controlling the output power Pm of the new energy power generation device according to the traction grid power P1 includes:
step S231: when the power P1 of the traction network is negative, if the electric power department allows the rest of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmmax); if the electric power department does not allow the residual electricity of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtSS, Pmmax); wherein PtN is the rated power of the traction substation TS, Pmmax is the maximum power generation power of the new energy power generation device, and PtSS is the instant energy storage power of the energy storage device TES; min (×) represents the minimum.
Step S232: when the power P1 of the traction network is positive, if the electric power department allows the rest of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmmax); if the electric power department does not allow the residual electricity of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (P1 + PtSS, Pmmax).
The energy storage device TES immediate energy storage power PtSS is determined by:
wherein,
rated power of the energy storage unit of the lithium battery,
Rated power of the super capacitor energy storage unit,
The rated power of the energy storage unit for producing hydrogen by electrolyzing water. Wherein,
the working state of a TES (storage energy System) of the energy storage device is obtained by a CCC (Central coordination controller) as a binary function, and when the energy storage unit of the lithium battery has energy storage capacity, the working state is set
Is 1, and vice versa
Is 0; when the super capacitor energy storage unit 5 has energy storage capacity, setting
Is 1, and vice versa
Is 0; when the energy storage unit 11 for hydrogen production by water electrolysis has energy storage capacity, the device is arranged
Is 1, and vice versa
Is 0.
Here, the output power Pm being Min (PtN + P1+ PtSS, Pmmax) means that the output power Pm is the smaller of PtN + P1+ PtSS, Pmmax, and accordingly, the output power Pm being Min (P1 + PtSS, Pmmax) means that the output power Pm is the smaller of P1+ PtSS, Pmmax.
For better understanding, as shown in fig. 3, step S23 further includes the following steps:
step SP 1: judging whether the power P1 of the traction network is negative, if so, performing a step SP2, otherwise, performing a step SP 5;
step SP 2: judging whether the electric power department allows the residual electricity of the traction power supply system to be on line or not, if so, performing a step SP3, otherwise, performing a step SP 4;
step SP 3: the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmax); wherein PtN is the rated power of the traction substation TS, and Pmmax is the maximum power generation power of the new energy power generation device;
step SP 4: the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtSS, Pmmax);
step SP 5: judging whether the electric power department allows the residual electricity of the traction power supply system to be on line or not, if so, performing a step SP6, otherwise, performing a step SP 7;
step SP 6: the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmax);
step SP 7: the central coordination controller CCC controls the output power Pm of the new energy power generation device to Min (P1 + PtSS, Pmmax).
Preferably, the control method further includes:
step S24: the CCC acquires a second current signal measured by the current transformer CT 2;
step S25: calculating the actual emitted power P2 of the new energy power generation device according to the acquired voltage signal and the second current signal;
step S26: and judging whether the actual generated power P2 of the new energy power generation device meets the requirement, and if not, adjusting the actual generated power P2 of the new energy power generation device.
Here, the determination of whether or not the actual generated power P2 of the new energy power generation device satisfies the requirement in step S26 may mean whether or not the actual generated power P2 satisfies the requirement for the output power Pm in step S231 or step S232.
Preferably, the control method further includes: and the central coordination controller CCC controls the energy storage device TES to operate under the working conditions of energy storage or energy release according to the acquired voltage information, the acquired first current information and the acquired second current information.
When the power P1 of the traction network is negative, if the electric power department does not allow the rest of the power of the traction power supply system to be on line, controlling the TES energy storage device to operate under the energy storage working condition; and if the electric power department allows the rest power of the traction power supply system to be on line, and when PtN + P1 is less than Pmmax, controlling the energy storage device TES to operate under the energy storage working condition.
When the power P1 of the traction network is positive, if the electric power department does not allow the rest of the power of the traction power supply system to be on line, and when P1< Pmmax, controlling the TES energy storage device to operate under the energy storage working condition; and if the electric power department allows the rest power of the traction power supply system to be on line, and when PtN + P1 is less than Pmmax, controlling the energy storage device TES to operate under an energy storage working condition.
When the traction network power P1 is positive, and when P1> Pref > Pmmax, the energy storage device TES is controlled to operate in a de-energized condition. Wherein Pref is a peak clipping power threshold of the traction substation TS.
The peak clipping power threshold Pref of the traction substation TS is determined according to a train operation diagram and traction load data, and the purpose is to perform real-time peak clipping on a traction load, so that the maximum demand of the traction load is reduced, and the basic electric charge of the traction substation is saved.
Here, when the energy storage device TES is provided in the distributed power generation system connected to the traction substation provided in embodiment 1, if the power department does not allow the remaining power of the traction power supply system to be on line, the electric energy generated by the new energy power generation device may be stored by the energy storage device TES in addition to providing traction power for the train, and accordingly, when the braking energy generated by train braking may also be stored by the energy storage device TES, and in addition, when the electric energy generated by the new energy power generation device may not satisfy the train traction power consumption, if the electric energy is stored in the energy storage device TES, the energy storage device TES is controlled to release energy to provide traction power for the train when the traction power consumption is at a peak value.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. The utility model provides an access draws distributed generation system of transformer substation, including drawing transformer substation TS and setting up new forms of energy power generation facility along drawing the net, draw the side of transformer substation TS and pass through the wire and be connected with drawing generating line TB1, draw generating line TB2 respectively, draw generating line TB1 and draw the R line of net through feeder TF1 and link to each other, draw generating line TB2 and draw the T line of net through feeder TF2 and link to each other, be equipped with voltage transformer PT between drawing generating line TB1 and the bus TB2, feeder TF2 is equipped with current transformer CT1, its characterized in that: laying a power cable CP line and a power cable CN line in parallel along the railway trend, and arranging n new energy power generation devices along the power cable CP line, wherein the n new energy power generation devices are specifically marked as a new energy power generation device G1, a new energy power generation device G2, new energy power generation devices Gi and … and a new energy power generation device Gn; the positive electrode of the new energy power generation device Gi is connected with a nearby power cable CP line through a feeder line GPi, and the negative electrode of the new energy power generation device Gi is connected with a nearby power cable CN line through a feeder line GNi; the power cable CP line and the power cable CN line are respectively connected with a traction bus TB2 and a traction bus TB1 through a feeder line TG2 and a feeder line TG1 at a traction substation TS, the feeder line TG2 is provided with a current transformer CT2, and the new energy power generation device directly supplies power to an alternating current traction load; the traction substation TS is provided with a central coordination controller CCC, the measurement and control end of the central coordination controller CCC is respectively connected with the measurement and control ends of a new energy power generation device G1, a new energy power generation device G2, new energy power generation devices Gi and … and a new energy power generation device Gn through an optical fiber pair sA1, an optical fiber pair sA2, optical fiber pairs sAi and … and an optical fiber pair sAn, and the measurement and control end of a voltage transformer PT, the measurement end of a current transformer CT1 and the measurement end of the current transformer CT2 are connected with the input end of the central coordination controller CCC; wherein n is more than or equal to 2, i =1,2,3, …, n.
2. The distributed power generation system connected to the traction substation according to claim 1, wherein: an energy storage device TES is arranged at the position of the traction substation TS, the energy storage device TES is respectively connected with a traction bus TB1 and a traction bus TB2, and a measurement and control end of a central coordination controller CCC is connected with a measurement and control end of the energy storage device TES through an optical fiber pair sES.
3. The distributed power generation system connected to the traction substation according to claim 2, wherein: the energy storage device TES comprises a single-phase energy storage transformer (1), a single-phase energy storage converter (2), a direct current bus (3), a fuel cell direct current converter (8), an electrolyzed water direct current converter (10), an electrolyzed water hydrogen production energy storage unit (11) and a fuel cell power generation unit (9); two ends of a high-voltage side of the single-phase energy storage transformer (1) are respectively connected with a traction bus TB1 and a traction bus TB2, a low-voltage side of the single-phase energy storage transformer (1) is connected with an alternating-current side of the single-phase energy storage converter (2), and a direct-current side of the single-phase energy storage converter (2) is connected with a direct-current bus (3); one side of the electrolyzed water direct-current converter (10) is connected with the direct-current bus (3), and the other side is connected with the electrolyzed water hydrogen production energy storage unit (11); one side of the fuel cell direct current converter (8) is connected with the direct current bus (3), and the other side of the fuel cell direct current converter is connected with the fuel cell power generation unit (9); the hydrogen stored in the water electrolysis hydrogen production energy storage unit (11) is supplied to a fuel cell power generation unit (9).
4. The distributed power generation system connected to the traction substation of claim 3, wherein: the energy storage device TES further comprises a super-capacitor direct-current converter (4), a lithium battery direct-current converter (6), a super-capacitor energy storage unit (5) and a lithium battery energy storage unit (7); one side of the super-capacitor direct-current converter (4) is connected with the direct-current bus (3), and the other side of the super-capacitor direct-current converter is connected with the super-capacitor energy storage unit (5); one side of the lithium battery direct-current converter (6) is connected with the direct-current bus (3), and the other side of the lithium battery direct-current converter is connected with the lithium battery energy storage unit (7).
5. A control method of a distributed power generation system connected to a traction substation according to any one of claims 1 to 4, characterized in that: the CCC judges whether a failed new energy power generation device exists or not, and controls the failed new energy power generation device to quit operation if the failed new energy power generation device exists; the CCC controls the new energy power generation device under normal working conditions to independently and autonomously generate power and operate.
6. The method for controlling the distributed power generation system connected to the traction substation according to claim 5, wherein the step of controlling the independent and autonomous power generation operation of the new energy power generation device under the normal working condition by the CCC comprises the following steps:
the method comprises the steps that a central coordination controller CCC obtains a voltage signal measured by a voltage transformer PT and a first current signal measured by a current transformer CT 1; calculating traction network power P1 according to the obtained voltage signal and the first current signal, wherein the traction network power P1 is traction power when flowing to the traction network, and is recorded as positive, and the active power is feedback power when flowing to the traction substation TS, and is recorded as negative; and the central coordination controller CCC controls the output power Pm of the new energy power generation device according to the traction grid power P1.
7. The method for controlling the distributed power generation system connected to the traction substation according to claim 6, wherein the controlling the output power Pm of the new energy power generation device according to the traction grid power P1 includes:
when the power P1 of the traction network is negative, if the electric power department allows the rest of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmmax); if the electric power department does not allow the residual electricity of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtSS, Pmmax); wherein PtN is the rated power of the traction substation TS, Pmmax is the maximum power generation power of the new energy power generation device, and PtSS is the instant energy storage power of the energy storage device TES; min (#) represents the minimum value;
when the power P1 of the traction network is positive, if the electric power department allows the rest of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (PtN + P1+ PtSS, Pmmmax); if the electric power department does not allow the residual electricity of the traction power supply system to be on line, the central coordination controller CCC controls the output power Pm of the new energy power generation device to be Min (P1 + PtSS, Pmmmax);
the energy storage device TES immediate energy storage power PtSS is determined by:
wherein,
rated power of the energy storage unit of the lithium battery,
Rated power of the super capacitor energy storage unit,
Rated power of the energy storage unit for hydrogen production by water electrolysis; wherein,
the working state of an energy storage device TES is obtained by a central coordination controller CCC as a binary function, and when the energy storage unit (7) of the lithium battery has energy storage capacity, the working state is set
Is 1, and vice versa
Is 0; when the super capacitor energy storage unit (5) has energy storage capacity, setting
Is 1, and vice versa
Is 0; when the energy storage unit (11) for hydrogen production by water electrolysis has energy storage capacity, the device is arranged
Is 1, and vice versa
Is 0.
8. The method for controlling the distributed power generation system connected to the traction substation according to claim 7, further comprising: the CCC acquires a second current signal measured by the current transformer CT 2;
calculating the actual emitted power P2 of the new energy power generation device according to the acquired voltage signal and the second current signal; and judging whether the actual generated power P2 of the new energy power generation device meets the requirement, and if not, adjusting the actual generated power P2 of the new energy power generation device.
9. The control method of the distributed power generation system connected to the traction substation according to claim 7, wherein the control method comprises the following steps: the control method further comprises the following steps: the CCC controls the energy storage device TES to operate under the working conditions of energy storage or energy release according to the acquired voltage information, the acquired first current information and the acquired second current information;
when the power P1 of the traction network is negative, if the electric power department does not allow the rest of the power of the traction power supply system to be on line, controlling the TES energy storage device to operate under the energy storage working condition; if the electric power department allows the residual electricity of the traction power supply system to be on line, and when PtN + P1 is less than Pmmax, controlling the energy storage device TES to operate under an energy storage working condition;
when the power P1 of the traction network is positive, if the electric power department does not allow the rest of the power of the traction power supply system to be on line, and when P1< Pmmax, controlling the TES energy storage device to operate under the energy storage working condition; if the electric power department allows the rest power of the traction power supply system to be on line, and when PtN + P1 is less than Pmmax, controlling the energy storage device TES to operate under an energy storage working condition;
when the power P1 of the traction network is positive, and when P1> Pref > Pmmax, controlling the TES to operate in an energy release working condition; wherein Pref is a peak clipping power threshold of the traction substation TS.
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