CN112350377B - In-phase traction power supply power generation system and control method - Google Patents
In-phase traction power supply power generation system and control method Download PDFInfo
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- CN112350377B CN112350377B CN202110028126.XA CN202110028126A CN112350377B CN 112350377 B CN112350377 B CN 112350377B CN 202110028126 A CN202110028126 A CN 202110028126A CN 112350377 B CN112350377 B CN 112350377B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L9/00—Electric propulsion with power supply external to the vehicle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/24—The renewable source being solar energy of photovoltaic 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
- H02J2300/28—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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a same-phase traction power supply power generation system and a control method, and relates to the technical field of electrified railway power supply. The secondary side of the traction transformer is connected with a traction bus; the head ends of the n uplink feeders are all connected with a traction bus, the tail ends of the n uplink feeders are correspondingly connected with n uplink overhead contact systems, the head ends of the m downlink feeders are all connected with the traction bus, and the tail ends of the m downlink feeders are correspondingly connected with the m downlink overhead contact systems; the input end of the coordination controller is connected with the measuring ends of the voltage transformer and the current transformer, and the output end of the coordination controller is connected with the control end of the new energy power generation device. And the alternating current output end of the new energy power generation device is connected with the traction bus. The invention is not only beneficial to the nearby consumption of new energy, promotes the green development of a railway system, avoids the related electric energy quality problem, but also brings extra economic income.
Description
Technical Field
The invention relates to the technical field of alternating current electrified railway power supply.
Background
The power generation by applying new energy and renewable energy is widely applied to power systems, the power generation capacity is improved year by year, and the progress is obvious.
The new energy, renewable energy and power grid-connected power generation trend is controlled according to grid-connected voltage phases, the new energy train power generation is an independent small system, and the trend is controlled by voltage regulation and frequency modulation. However, obviously, the power of the new energy train is strictly limited by the self weight and volume, and the requirement of high-power traction cannot be met, so a high-power new energy utilization scheme suitable for the characteristics of a traction power supply system needs to be provided, and meanwhile, a new energy power generation flow control method connected with the traction power supply system needs to be established according to the traction load characteristics, and is completely different from a flow control method connected with a power grid for power generation and a new energy train power generation flow control method.
Disclosure of Invention
The invention aims to provide an in-phase traction power supply power generation system which can effectively solve the technical problem that a new energy power generation device is connected with a traction bus in a grid mode.
The purpose of the invention is realized by the following technical scheme: the in-phase traction power supply power generation system comprises a traction transformer TT, a traction bus TB and a feeder TF, wherein the secondary side of the traction transformer TT is connected with the traction bus TB, a voltage transformer PT is arranged on the traction bus TB, the alternating current output end of a new energy power generation device NES is connected with the traction bus TB, the feeder TF is divided into n uplink feeders TF11, TF12, …, TF1n and m downlink feeders TF21, TF22, … and TF2m, each uplink feeder and each downlink feeder are provided with a current transformer CT, n is more than or equal to 2, m is more than or equal to 2, and the system comprises: the head ends of n uplink feeders TF11, TF12, … and TF1n are all connected with the traction bus TB, and the tail ends of the n uplink feeders TF11, TF12, … and TF1n are correspondingly connected with n uplink contact networks CW11, CW12, … and CW1 n; the head ends of m downlink feeder lines TF21, TF22, … and TF2m are all connected with a traction bus TB, and the tail ends of the m downlink feeder lines TF21, TF22, … and TF2m are correspondingly connected with m downlink contact networks CW21, CW22, … and CW2 m; and the measuring end of the voltage transformer PT and the measuring end of the current transformer CT are both connected with the input end of a coordination controller CCS, and the output end of the coordination controller CCS is connected with the control end of the new energy power generation device NES.
Further, the new energy power generation device NES includes a new energy power generation unit GB and a converter CVT, an ac end of the converter CVT is connected to the traction bus TB as an ac output end of the new energy power generation device NES, and a dc end of the converter CVT is connected to a dc output end of the new energy power generation unit GB.
Further, the traction bus TB provides a grid-connected operation voltage for the ac output of the converter CVT.
Further, the new energy power generation unit GB is one or more of a wind power generation unit, a photovoltaic power generation unit, a hydrogen power generation unit, and a biochemical power generation unit.
Further, the new energy power generation unit GB is connected with the energy storage unit PB in parallel, the direct current end of the energy storage unit PB is connected with the direct current end of the converter CVT, and the energy storage unit PB is one or more of electrochemical energy storage, physical energy storage and electromagnetic energy storage.
The invention also aims to provide a control method based on the in-phase traction power supply power generation system, which can effectively solve the technical problem of controlling the new energy power generation device to be connected with the traction power supply system in a grid mode.
The purpose of the invention is realized by the following technical scheme: the method comprises the following steps:
the coordination controller CCS obtains voltage information measured by a voltage transformer PT and current information measured by each current transformer CT, and respectively calculates active power P11, P12, …, P1n of n uplink feeders TF11, TF12, … and TF1n and active power P21, P22, … and P2m of m downlink feeders TF21, TF22, … and TF2m according to the voltage information and the current information, wherein the active power flows to a contact net and is recorded as traction power, the active power flows to a traction bus and is recorded as regenerative power and negative;
summing the active power P11, P12, … and P1n of the n uplink feeders TF11, TF12, … and TF1n to obtain the active power P1 of the uplink feeders; summing the active power P21, P22, … and P2m of the m downlink feeder lines TF21, TF22, … and TF2m to obtain the active power P2 of the downlink feeder lines; summing the uplink feeder active power P1 and the downlink feeder active power P2 to obtain a feeder total active power P;
and controlling active power P3 emitted by the new energy power generation device NES to reach a preset condition according to the total active power P of the feeder line.
Further, the controlling active power P3 generated by the new energy power generation device NES to reach a preset condition according to the total active power P of the feeder line includes:
judging whether the total active power P of the feeder line is traction power, if not, judging that the active power P3=0 emitted by the new energy power generation device NES; if so, judging whether the total active power P of the feeder line is greater than the maximum active power Ps capable of being generated by the new energy power generation device NES, if so, controlling the active power P3= Ps generated by the new energy power generation device NES, otherwise, controlling the active power P3= P generated by the new energy power generation device NES.
Further, the method further comprises:
the lengths of the n uplink overhead contact lines CW11, CW12, …, CW1n and the m downlink overhead contact lines CW21, CW22, … and CW2m are prolonged, so that the sum of the traction power of all the feeder lines is larger than or equal to the sum of the regenerative power of all the feeder lines.
Further, the method further comprises:
the coordination controller CCS controls the new energy power generation device NES and the converter CVT to output power in a coordinated mode, meanwhile, a control command of the coordination controller CCS is issued through the output end, an execution result of the new energy power generation device NES is detected, closed-loop control is formed, and the fact that the command of the coordination controller CCS is executed correctly is guaranteed.
Further, the method further comprises:
according to the obtained voltage information and current information, reactive powers Q11, Q12, … and Q1n of n uplink feeders TF11, TF12, … and TF1n and reactive powers Q21, Q22, … and Q2m of m downlink feeders TF21, TF22, … and TF2m are obtained through calculation;
and controlling the converter CVT to perform reactive compensation on inductive reactive power and/or capacitive reactive power emitted by the traction bus TB according to the calculated reactive power total condition.
Further, the method further comprises:
and controlling the converter CVT to send harmonic current to the traction bus TB according to the voltage information and the current information to carry out traction network voltage harmonic treatment and provide electric energy for the traction bus TB, so that the load borne by the traction transformer TT is reduced, and the negative sequence current of the traction transformer TT meets the preset requirement.
According to the invention, the new energy power generation device connected with the traction bus is arranged on the ground, and the new energy power generation device can be controlled by the coordination controller to directly provide high-power electric energy for the traction bus to be used by a train of the traction power supply system, so that the new energy can be easily absorbed nearby, the green development of a railway system is promoted, the related electric energy quality problem is avoided, and extra economic income can be brought.
Drawings
Fig. 1 is a schematic structural diagram of an in-phase traction power supply power generation system according to the invention.
Fig. 2 is a schematic structural diagram of another in-phase traction power supply power generation system of the invention.
Fig. 3 is a schematic structural diagram of a specific in-phase traction power supply power generation system of the invention.
FIG. 4 is a flow chart of a control method according to the present invention.
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 present embodiment provides an in-phase traction power supply power generation system, which includes a traction transformer TT, a traction bus TB, and a feeder line TF, where a secondary side of the traction transformer TT is connected to the traction bus TB, and is characterized in that: the traction bus TB is provided with a voltage transformer PT, the alternating current output end of the new energy power generation device NES is connected with the traction bus TB, the feeder TF is divided into n uplink feeders TF11, TF12, …, TF1n, m downlink feeders TF21, TF22, … and TF2m, each uplink feeder and each downlink feeder are provided with a current transformer CT, n is more than or equal to 2, m is more than or equal to 2, wherein: the head ends of n uplink feeders TF11, TF12, … and TF1n are all connected with the traction bus TB, and the tail ends of the n uplink feeders TF11, TF12, … and TF1n are correspondingly connected with n uplink contact networks CW11, CW12, … and CW1 n; the head ends of m downlink feeder lines TF21, TF22, … and TF2m are all connected with a traction bus TB, and the tail ends of the m downlink feeder lines TF21, TF22, … and TF2m are correspondingly connected with m downlink contact networks CW21, CW22, … and CW2 m; and the measuring end of the voltage transformer PT and the measuring end of the current transformer CT are both connected with the input end of a coordination controller CCS, and the output end of the coordination controller CCS is connected with the control end of the new energy power generation device NES.
In the embodiment, the primary side of the traction transformer TT as the input end of the in-phase traction power supply and generation system may be directly connected to the three-phase public power grid PS. In this embodiment, the head ends of the n uplink feeder lines TF11, TF12, …, and TF1n are all connected to the traction bus TB, and the tail ends of the n uplink feeder lines TF11, TF12, …, and TF1n are correspondingly connected to the n uplink overhead contact lines CW11, CW12, …, and CW1n refer to: the head end of an uplink feeder TF11 is connected with a traction bus TB, the tail end of an uplink feeder TF11 is connected with an uplink overhead line system CW11, the head end of an uplink feeder TF12 is connected with the traction bus TB, the tail end of an uplink feeder TF12 is connected with an uplink overhead line system CW12, …, the head end of an uplink feeder TF1n is connected with the traction bus TB, and the tail end of the uplink feeder TF1n is connected with an uplink overhead line system CW1 n; similarly, the head ends of the m downlink feeder lines TF21, TF22, … and TF2m are all connected to the traction bus TB, and the tail ends of the m downlink feeder lines (TF 21, TF22, … and TF2 m) are correspondingly connected to m downlink contact lines CW21, CW22, … and CW2m, which refer to: the head end of a downlink feeder line TF21 is connected with a traction bus TB, the tail end of a downlink feeder line TF21 is connected with a downlink contact net CW21, the head end of a downlink feeder line TF22 is connected with the traction bus TB, the tail end of a downlink feeder line TF22 is connected with a downlink contact net CW22, …, the head end of a downlink feeder line TF2m is connected with the traction bus TB, and the tail end of a downlink feeder line TF2m is connected with a downlink contact net CW2 m. Here, the n uplink feeders TF11, TF12, …, TF1n and the m downlink feeders TF21, TF22, …, TF2m are all connected with the same traction bus TB, so that the regenerative power generated by braking trains under the same traction bus can be utilized by the traction trains to the maximum extent, and the regenerative power utilization is more economical and efficient.
In addition, because the new energy power generation device NES connected with the traction bus TB is arranged in the embodiment, and the new energy power generation device NES is controlled by the coordination controller CCS to supply electric energy to the traction bus TB, the load of the in-phase traction power supply power generation system can be subjected to peak clipping, the embodiment is favorable for nearby consumption of new energy, green development of a railway system is promoted, and not only is the related electric energy quality problem avoided, but also extra economic income can be brought.
It should be further noted that, in this embodiment, the new energy power generation device NES is connected to the in-phase traction power supply power generation system, so as to share the load of the traction transformer TT, and during the peak period of the load power, the voltage imbalance (negative sequence current) is expressed to the maximum, and the load is balanced by "peak clipping" of the new energy power generation device NES, so as to reduce the voltage imbalance (negative sequence current) and improve the negative sequence effect.
Preferably, the new energy power generation device NES includes a new energy power generation unit GB and a converter CVT, an ac terminal of the converter CVT is connected to the traction bus TB as an ac output terminal of the new energy power generation device NES, and a dc terminal of the converter CVT is connected to a dc output terminal of the new energy power generation unit GB. In this embodiment, the new energy power generation unit GB may be one or more of a wind power generation unit, a photovoltaic power generation unit, a hydrogen power generation unit, and a biochemical power generation unit.
Preferably, the traction bus TB provides a grid-connected operating voltage to the ac output of the converter CVT.
Preferably, as shown in fig. 2, the present embodiment may further include an energy storage unit PB connected in parallel with the new energy power generation unit GB, a direct current end of the energy storage unit PB is connected with a direct current end of the converter CVT, and the energy storage unit PB is one or more of electrochemical energy storage, physical energy storage, and electromagnetic energy storage.
The energy storage unit PB is additionally arranged in the embodiment, so that peak clipping and valley filling can be realized. When the electric energy generated by the new energy power generation unit GB cannot meet the traction power required by the traction train, the energy storage unit PB can be controlled to discharge to further provide the traction power for the traction train, when the regenerative power generated by braking the train is larger than the traction power required by the traction train, the energy storage unit PB can be controlled to absorb redundant regenerative power, and during specific implementation, the discharge power and the charge power of the energy storage unit PB are controlled according to actual conditions.
As shown in fig. 3, taking the new energy power generation unit GB as a hydrogen energy power generation unit and the energy storage unit PB as physical energy storage as an example, the hydrogen energy power generation unit includes a hydrogen energy power generation module H2And a rectifier module DC/DC, a hydrogen energy power generation module H2And the rectifying module DC/DC in the hydrogen energy power generation unit and the rectifying module DC/DC in the energy storage unit PB are connected with the direct current end of the converter CVT through a direct current bus.
Example 2
As shown in fig. 4, this embodiment provides a control method of an in-phase traction power supply power generation system provided in embodiment 1, which is applied to a coordination controller CCS, and the method includes:
s1: the method comprises the steps that a coordination controller CCS obtains voltage information measured by a voltage transformer PT and current information measured by each current transformer CT; s2: according to the voltage information and the current information, active power P11, P12, … and P1n of n uplink feeders TF11, TF12, … and TF1n, active power P21, P22, … and P2m of m downlink feeders TF21, TF22, … and TF2m are respectively obtained through calculation, wherein the active power flowing to a contact net is traction power and is recorded as positive, and the active power flowing to a traction bus is regenerative power and is recorded as negative;
s3: summing active power P11, P12, … and P1n of n uplink feeders TF11, TF12, … and TF1n to obtain uplink feeder active power P1, summing active power P21, P22, … and P2m of m downlink feeders TF21, TF22, … and TF2m to obtain downlink feeder active power P2, and summing the uplink feeder active power P1 and the downlink feeder active power P2 to obtain total feeder active power P;
s4: and controlling active power P3 emitted by the new energy power generation device NES to reach a preset condition according to the total active power P of the feeder line.
Here, the active power P11, P12, …, and P1n of the n uplink feeders TF11, TF12, …, and TF1n refer to: active power P11 of an uplink TF11, active power P12, … of an uplink TF12, and active power P1n of an uplink TF1 n; similarly, the active power P21, P22, …, and P2m of the m downlink feeder lines TF21, TF22, …, and TF2m refer to: the active power P21 of downlink feeder TF21, the active powers P22, … of downlink feeder TF22, and the active power P1n of uplink feeder TF1 n.
Preferably, the step S4 of controlling the generated power P3 of the new energy power generation apparatus NES to reach the preset condition according to the total active power P of the feeder line, includes:
s41: judging whether the total active power P of the feeder line is traction power, if so, carrying out the next step, otherwise, judging that the active power P3=0 sent by the NES;
s42: and judging whether the total active power P of the feeder line is greater than the maximum active power Ps capable of being generated by the new energy power generation device NES, if so, controlling the active power P3= Ps generated by the new energy power generation device NES, otherwise, controlling the active power P3= P generated by the new energy power generation device NES.
Preferably, the traction bus TB provides a grid-connected operating voltage to the ac output of the converter CVT. Here, the traction bus TB is connected to the utility grid through the traction transformer TT, so that a reliable, stable and powerful voltage support can be provided for grid connection of the new energy power generation device, and a "current control current source" operation mode of the new energy power generation device is realized, that is, the new energy power generation device (as a current source) is controlled to output a specific active power according to the total active power (greater than or equal to 0) of a feeder line.
Preferably, the method further comprises: the lengths (distances) of the n uplink overhead contact systems CW11, CW12, …, CW1n and the m downlink overhead contact systems CW11, CW12, … and CW1n are prolonged, so that the sum of the traction power of all the feeder lines is larger than or equal to the sum of the regenerative power of all the feeder lines. The trains running in the traction power supply system can be divided into an electric traction train, a power generation regeneration (braking) train and an idle and stop train only using electricity according to working conditions, the electric power consumption of the trains is always greater than the power generation power due to the existence of running resistance, and the longer the contact net (power supply arm) supplying power to the trains is, the higher the probability that the traction train absorbs the power generation of the regeneration (braking) train in the same running train on the power supply arm is, so that the sum of the traction power and the regeneration power can be more than or equal to the sum of the lengths of the upper contact net and the lower contact net, and the total utilization of the regeneration power can be expected under the conditions of not arranging an energy storage device and not additionally increasing investment, and the train is very economical and environment-friendly.
Preferably, the method further comprises:
the coordination controller CCS controls the new energy power generation device NES and the converter CVT to cooperatively output power, a control instruction of the coordination controller CCS is issued through an output end, an execution result of the new energy power generation device NES is detected, closed-loop control is formed, and the accurate execution of the command of the coordination controller CCS is guaranteed.
Preferably, the method further comprises:
according to the obtained voltage information and current information, reactive powers Q11, Q12, … and Q1n of n uplink feeders TF11, TF12, … and TF1n and reactive powers Q21, Q22, … and Q2m of m downlink feeders TF21, TF22, … and TF2m are obtained through calculation;
and controlling the converter CVT to perform reactive compensation on inductive reactive power and/or capacitive reactive power emitted by the traction bus TB according to the total situation of the reactive power obtained by calculation.
Here, the reactive powers Q11, Q12, … and Q1n of the n uplink feeders TF11, TF12, … and TF1n refer to: reactive power Q11 of an uplink TF11, reactive power Q12, … of an uplink TF12, and reactive power Q1n of an uplink TF1 n; similarly, the reactive powers Q21, Q22, … and Q2m of the m downlink feeder lines TF21, TF22, … and TF2m refer to: reactive power Q21 of downlink TF21, reactive power Q22, … of downlink TF22, and reactive power Q1n of uplink TF1 n.
Preferably, the method further comprises:
and controlling the converter CVT to send harmonic current to the traction bus TB for carrying out traction network voltage harmonic treatment according to the obtained voltage information and current information.
Preferably, the method further comprises:
and controlling the new energy power generation device NES to provide electric energy for the traction bus TB according to the obtained voltage information and current information, reducing the load borne by the traction transformer TT and enabling the negative-sequence current of the traction transformer TT to reach the preset requirement.
Considering that the railway user should not feed back electric energy to the power grid under the condition of not obtaining the power generation qualification of the power grid so as to avoid punitive charging and energy waste, corresponding measures are taken: (1) the length of the uplink and downlink contact network is prolonged so that the sum of the traction power of each feeder line is more than or equal to the sum of the regenerative power of each feeder line, and the regenerative power can be absorbed by a traction train; (2) controlling the output of the new energy power generation device according to the total traction power; (3) an energy storage unit is added.
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 (6)
1. The utility model provides a homophase pulls power supply power generation system, includes traction transformer TT, pulls busbar TB and feeder TF, and traction transformer TT's secondary is connected with traction busbar TB, its characterized in that: the traction bus TB is provided with a voltage transformer PT, the alternating current output end of the new energy power generation device NES is connected with the traction bus TB, the feeder TF is divided into n uplink feeders TF11, TF12, …, TF1n, m downlink feeders TF21, TF22, … and TF2m, each uplink feeder and each downlink feeder are provided with a current transformer CT, n is more than or equal to 2, m is more than or equal to 2, wherein: the head ends of n uplink feeders TF11, TF12, … and TF1n are all connected with the traction bus TB, and the tail ends of the n uplink feeders TF11, TF12, … and TF1n are correspondingly connected with n uplink contact networks CW11, CW12, … and CW1 n; the head ends of m downlink feeder lines TF21, TF22, … and TF2m are all connected with a traction bus TB, and the tail ends of the m downlink feeder lines TF21, TF22, … and TF2m are correspondingly connected with m downlink contact networks CW21, CW22, … and CW2 m; the lengths of n uplink overhead contact lines CW11, CW12, …, CW1n and m downlink overhead contact lines CW11, CW12, … and CW1n are prolonged, so that the sum of the traction power of all the feeder lines is larger than or equal to the sum of the regenerative power of all the feeder lines; and the measuring end of the voltage transformer PT and the measuring end of the current transformer CT are both connected with the input end of a coordination controller CCS, and the output end of the coordination controller CCS is connected with the control end of the new energy power generation device NES.
2. An in-phase traction power generation system according to claim 1, wherein: the new energy power generation device NES comprises a new energy power generation unit GB and a converter CVT, the alternating current end of the converter CVT is used as the alternating current output end of the new energy power generation device NES and is connected with a traction bus TB, and the direct current end of the converter CVT is connected with the direct current output end of the new energy power generation unit GB.
3. An in-phase traction power generation system according to claim 2, wherein: the new energy power generation unit GB is one or more of a wind energy power generation unit, a photovoltaic power generation unit, a hydrogen energy power generation unit and a biochemical energy power generation unit.
4. An in-phase traction power generation system according to claim 2, wherein: the new energy power generation unit GB is connected with the energy storage unit PB in parallel, the direct current end of the energy storage unit PB is connected with the direct current end of the converter CVT, and the energy storage unit PB is one or more of electrochemical energy storage, physical energy storage and electromagnetic energy storage.
5. A control method of an in-phase traction power supply power generation system based on any one of claims 2 to 4 is characterized in that: the method comprises the following steps:
the method comprises the steps that a coordination controller CCS obtains voltage information measured by a voltage transformer PT and current information measured by each current transformer CT;
according to the obtained voltage information and current information, active power P11, P12, … and P1n of n uplink feeders TF11, TF12, … and TF1n, active power P21, P22, … and P2m of m downlink feeders TF21, TF22, … and TF2m are obtained through calculation respectively, wherein the active power flow to the overhead contact system is traction power and is recorded as positive, and the active power flow to the traction bus is regenerative power and is recorded as negative;
summing the active power P11, P12, … and P1n of the n uplink feeders TF11, TF12, … and TF1n to obtain the active power P1 of the uplink feeders; summing the active power P21, P22, … and P2m of the m downlink feeder lines TF21, TF22, … and TF2m to obtain the active power P2 of the downlink feeder lines; summing the uplink feeder active power P1 and the downlink feeder active power P2 to obtain a feeder total active power P;
and controlling the active power P3 generated by the new energy power generation device NES to reach a preset condition according to the total active power P of the feeder line.
6. The control method according to claim 5, wherein the controlling active power P3 generated by a new energy generation device NES according to the total feeder active power P to reach a preset condition comprises:
judging whether the total active power P of the feeder line is traction power, if not, the active power P3=0 sent by the new energy power generation device NES; if so, judging whether the total active power P of the feeder line is greater than the maximum active power Ps which can be generated by the new energy power generation device NES, and if so, controlling the active power P3= Ps generated by the new energy power generation device NES; otherwise, controlling active power P3= P emitted by the new energy power generation device NES; the lengths of the n uplink overhead contact lines CW11, CW12, …, CW1n and the m downlink overhead contact lines CW21, CW22, … and CW2m are prolonged, so that the sum of the traction power of all the feeder lines is larger than or equal to the sum of the regenerative power of all the feeder lines.
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| CN113489006A (en) * | 2021-07-30 | 2021-10-08 | 盾石磁能科技有限责任公司 | Energy management device in traction power supply system and traction power supply system |
| CN113497461B (en) * | 2021-09-08 | 2021-11-23 | 西南交通大学 | Three-phase traction network distributed power generation and supply system and control method |
| CN113497460B (en) * | 2021-09-08 | 2021-11-30 | 西南交通大学 | Distributed power generation system connected to traction substation and control method |
| CN113492733B (en) * | 2021-09-08 | 2021-11-26 | 西南交通大学 | Traction network distributed power generation and supply system and control method |
| CN114336584A (en) * | 2021-12-23 | 2022-04-12 | 核工业理化工程研究院 | Control system and control method for absorbing and utilizing subway regenerated energy |
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