CN212543373U - Electrified railway cophase energy storage power supply system - Google Patents
Electrified railway cophase energy storage power supply system Download PDFInfo
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Abstract
The utility model provides an electrified railway in-phase energy storage and power supply system, relating to the technical field of electrified railway traction power supply, comprising a traction transformer, a photovoltaic in-phase energy storage device, a current transformer arranged on a traction feeder line and a voltage transformer on an in-phase traction bus; the photovoltaic in-phase energy storage device consists of an in-phase photovoltaic bridge arm, a capacitor bridge arm and an in-phase energy storage bridge arm; the traction transformer adopts a three-phase/two-phase wiring form, the network side is connected with a three-phase power system, one phase traction side winding is directly connected with an in-phase traction bus, the other phase traction side winding is connected with an in-phase traction bus through a photovoltaic in-phase energy storage device, and the in-phase power supply bus is connected with the traction network through a feeder line; the measuring ends of the voltage transformer and the current transformer are respectively connected with the detection signal input end of the measurement and control unit, and the control signal output end of the measurement and control unit is connected with the control end of the photovoltaic in-phase energy storage device.
Description
Technical Field
The utility model relates to an electric railway pulls power supply technical field.
Background
Along with the development of high-speed and heavy-load electric traction of an electrified railway and the rapid popularization and application of alternating current, direct current and alternating current trains, the power and the traffic of a single train are increased rapidly, and a traction power supply system has the new characteristics of obvious negative sequence content, outstanding electric transient caused by electric phase splitting and the like. However, when the electric locomotive stops at a station and decelerates or goes downhill, a large amount of regenerative braking energy is generated, and the regenerative braking energy belongs to unintended power generation and can bring adverse effects to a power grid. The energy storage device is adopted to store and utilize the regenerative braking energy of the train, thereby not only reducing the influence on the public power grid, but also saving the energy loss and smoothing the fluctuation of the traction load. Therefore, the energy storage technology is added on the basis of in-phase power supply, and the performance of traction power supply is further improved.
At present, an energy storage scheme based on single-phase and in-phase power supply exists, an in-phase energy storage function is achieved by arranging an energy storage device on an alternating-current bus, the scheme is simple in structure, and the advantages are obvious. However, when the energy storage device is not enough to control the negative sequence content within the national standard range, other electric energy quality control devices are required to be supplemented. There is also an energy storage scheme using ac-dc-ac in-phase power supply technology, in which an energy storage device is arranged on the dc bus of an ac-dc-ac converter. Because the cophase power supply converter mostly adopts a cascade topology, the number of direct current buses is large, the technical difficulty and the cost of energy storage device integration are increased, and the independence and the flexibility of energy storage device configuration are influenced to a certain extent. In addition, most of the energy storage devices are coupled with an alternating current system of the traction transformer through a transformer, transformer loss exists in the charging and discharging processes, and the utilization rate of regenerative braking energy is reduced. At the same time, the footprint and noise of the transformer are additional non-negligible factors. The above problem is exacerbated especially when the transformer is multi-winding.
Photovoltaic power generation is used as a green light energy source, is connected into a traction power supply system, is beneficial to energy conservation and emission reduction, and has certain economical efficiency. The photovoltaic is connected into the energy storage and power supply system, and the energy storage device is utilized to form the complementary advantage of light storage, so that the photovoltaic power supply system has important significance in further improving the performance and the economy of the traction power supply system.
How to combine the energy storage technology, photovoltaic power generation and in-phase power supply to implement safe, reliable and energy-saving power supply of the electrified railway is a hotspot of research in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electronic railway homophase energy storage power supply system, it can solve the technical problem of electronic railway safe and reliable power supply effectively.
The purpose of the utility model is realized through the following technical scheme: the electrified railway in-phase energy storage and power supply system comprises a traction transformer, a photovoltaic in-phase energy storage device, a current transformer and a voltage transformer, wherein the current transformer and the voltage transformer are arranged on a traction feeder line, measuring ends of the current transformer and the voltage transformer are respectively connected with a detection signal input end of a measurement and control unit, and the photovoltaic in-phase energy storage device is composed of an in-phase photovoltaic bridge arm MS1And MS2Capacitor bridge arm C1And C2And in-phase energy storage bridge arm MT1And MT2Composition of photovoltaic bridge arm M in phaseS1And MS2Through the series connection point L1Connected in series to form SL1 branch, capacitor bridge arm C1And C2Through the series connection point L2Connected in series to form an SL2 branch, an in-phase energy storage bridge arm MT1And MT2Through the series connection point L3An SL3 branch is formed in series, and a branch SL1, a branch SL2 and a branch SL3 form a parallel circuit; the traction transformer is in a three-phase/two-phase connection mode, a three-phase power system is connected to the network side, and one end of a first winding a at the traction side is connected withThe other end of the ground is connected with an in-phase traction bus, and one end of a traction-side second winding b is connected with a series connection point L of the photovoltaic in-phase energy storage device1The other end of the photovoltaic grid is connected with a series connection point L of the photovoltaic in-phase energy storage device2Series connection point L of photovoltaic same-phase energy storage devices connected and grounded3The in-phase traction bus is connected with the traction network through a traction feeder; the control signal output end of the measurement and control unit is respectively connected with the in-phase photovoltaic bridge arm M of the photovoltaic in-phase energy storage deviceS1And MS2Control end and in-phase energy storage bridge arm MT1And MT2Is connected with the control end of the controller.
The in-phase photovoltaic bridge arm MS1And MS2The power photovoltaic modules PM have the same structure and are all provided with n power photovoltaic modules PM with the same structure1,PM2,…,PMnIs connected with an inductor L in series, and the power photovoltaic module is composed of two IGBT devices TP1And TP2Connected in series with a capacitor CP0Single-phase half-bridge structure formed in parallel on capacitor CP0The side is connected in parallel with the photovoltaic device PV, wherein n is more than or equal to 1.
The in-phase energy storage bridge arm MT1And MT2The power energy storage modules TM have the same structure and are all n power energy storage modules TM with the same structure1,TM2,…,TMnIs connected with an inductor L in series, and the power energy storage module is composed of two IGBT devices TT1And TT2Connected in series with a capacitor CT0Single-phase half-bridge structure formed in parallel on capacitor CT0The side is connected with an energy storage device ESD in parallel, wherein n is more than or equal to 1.
The traction transformer is an SCOTT connection wire, an YNd11 or a Vv connection wire.
The voltage transformer is used for measuring the voltage of the in-phase traction bus, and the current transformer is used for measuring the current of the traction feeder.
The energy storage medium of the energy storage device ESD is one of electromagnetic energy storage, physical energy storage or electrochemical energy storage.
The purpose of the utility model needs to be realized by the following technical scheme: knowing the negative sequence power allowable value P of the power gridNAnd a discharge threshold value PDRated power of energy storage device ESDIs PESDThe control method comprises the following steps: the measurement and control unit respectively acquires voltage data and current data transmitted by the voltage transformer and the current transformer; calculating to obtain active power S of the traction load according to the voltage data and the current data; obtaining photovoltaic device power PPV；
The method comprises the following steps: the measurement and control unit judges whether the active power S of the traction load is less than zero, and if so, controls the n power energy storage modules TM1,TM2,…,TMnCharging and controlling n power photovoltaic modules PM1,PM2,…,PMnStandby, otherwise, entering the step two; at this time, the power storage module TM1,TM2,…,TMnCharging power of SCThen, there are:
when-S < PESDWhen S is presentC＝-S；
when-S is not less than PESDWhen S is presentC＝PESD；
Step two: the measurement and control unit judges whether the active power S of the traction load is smaller than a discharge threshold value PD+PPVIf yes, controlling n power energy storage modules TM1,TM2,…,TMnStandby and control of n power photovoltaic modules PM1,PM2,…,PMnGenerating power, otherwise, entering the third step; at this time, the power photovoltaic module PM1,PM2,…,PMnGenerated power S of generated powerPIs S and PPVThe minimum of the two;
step three: the measurement and control unit judges whether the active power S of the traction load is smaller than the allowable value P of the negative sequence power of the power gridNIf yes, controlling n power energy storage modules TM1,TM2,…,TMnDischarging and controlling n power photovoltaic modules PM1,PM2,…,PMnGenerating power, otherwise, entering the fourth step; at this time, the power storage module TM1,TM2,…,TMnDischarge power of discharge is SDThen, there are:
when S < PESDWhen S is presentD＝S；
When S is more than or equal to PESDWhen S is presentD＝PESD；
At this time, the power photovoltaic module PM1,PM2,…,PMnGenerated power S of generated powerPIs PPV；
Step four: the measurement and control unit controls n power energy storage modules TM1,TM2,…,TMnDischarging and controlling n power photovoltaic modules PM1,PM2,…,PMnGenerating power and transmitting active power to the traction side; at this time, the power storage module TM1,TM2,…,TMnDischarge power of discharge is SDPower photovoltaic module PM1,PM2,…,PMnPower generation SPIs PPVTransferring active power to the traction side as PTThen, there are:
when S < PESDWhen S is presentD＝S；
When S is more than or equal to PESDWhen S is presentD＝PESD；
When S is less than SD+PN+PPV，PT＝0；
When S is more than or equal to SD+PN+PPV，PT＝(S-SD-PN-PPV) 2; wherein, PN＞0，PD＞0，PPV≥0。
Rated power P of ESD of the energy storage deviceESDAnd a discharge threshold value PDBy loading active power S and photovoltaic power PPVOptimizing to obtain a historical value, wherein the allowable value P of the negative sequence power of the power gridNThe method is determined by the indexes of the capacity of the power grid and the unbalance degree of the quality voltage of the electric energy.
The measurement and control unit comprises:
a data acquisition module: power P for acquiring voltage data and current data transmitted by voltage transformer and current transformer and photovoltaic devicePV；
A calculation module: the active power S of the traction load is obtained through calculation according to the voltage data and the current data;
a first module: used for judging whether the active power S of the traction load is less than zero, if so, controllingMaking n power storage modules TM1,TM2,…,TMnCharging and controlling n power photovoltaic modules PM1,PM2,…,PMnStandby, otherwise, entering a second module;
a second module: for judging whether active power S of traction load is less than discharge threshold PD+PPVIf yes, controlling n power energy storage modules TM1,TM2,…,TMnStandby and control of n power photovoltaic modules PM1,PM2,…,PMnGenerating power, otherwise, entering the third step;
a third module: used for judging whether the active power S of the traction load is smaller than the allowable value P of the negative sequence power of the power gridNIf yes, controlling n power energy storage modules TM1,TM2,…,TMnDischarging and controlling n power photovoltaic modules PM1,PM2,…,PMnGenerating power, otherwise, entering the fourth step;
a fourth module: for controlling n power storage modules TM1,TM2,…,TMnDischarging and controlling n power photovoltaic modules PM1,PM2,…,PMnGenerates electricity and transfers active power to the traction side.
Compared with the prior art, the utility model advantage and effect:
firstly, a matching transformer at the traction side is cancelled, so that the transformer loss in the charging and discharging processes is reduced, and the utilization rate of regenerative braking energy is improved;
secondly, the modular construction is beneficial to the independence, flexibility, expandability and redundancy backup of the photovoltaic and energy storage device configuration;
thirdly, the utility model discloses the technique is advanced, easy to carry out.
Drawings
Fig. 1 is a schematic structural view of a first in-phase energy storage and power supply system of the electric railway of the present invention.
Fig. 2 is a schematic structural view of a second in-phase energy storage and power supply system of the electric railway of the present invention.
Fig. 3 is a schematic structural view of a third in-phase energy storage and power supply system of the electric railway of the present invention.
Fig. 4 is a same-phase photovoltaic bridge arm structure schematic diagram shown in the embodiment of the present invention.
Fig. 5 is a schematic diagram of an in-phase energy storage bridge arm structure shown in the embodiment of the present invention.
Fig. 6 is a schematic diagram of an in-phase power supply bridge arm structure shown in the embodiment of the present invention.
Fig. 7 is a block diagram of the measurement and control unit structure of the present invention.
Reference numerals: the system comprises a traction transformer 1, a traction side first winding a of the traction transformer 1a, a traction side second winding b of the traction transformer 1b, a photovoltaic in-phase energy storage device 2, an in-phase traction bus 3, a traction feeder 4, a measurement and control unit 5, a voltage transformer 6 and a current transformer 7.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
Example 1
As shown in fig. 1, this embodiment provides an electrified railway in-phase energy storage power supply system, including traction transformer 1, photovoltaic in-phase energy storage device 2 and current transformer 7 of setting on in-phase traction bus 3 voltage transformer 6 and traction feeder 4, voltage transformer 6, current transformer 7's measuring terminal is connected with the detection signal input of observing and controlling unit 5 respectively, its characterized in that: the photovoltaic in-phase energy storage device 2 is composed of an in-phase photovoltaic bridge arm MS1And MS2Capacitor bridge arm C1And C2And in-phase energy storage bridge arm MT1And MT2Composition of photovoltaic bridge arm M in phaseS1And MS2Through the series connection point L1Connected in series to form SL1 branch, capacitor bridge arm C1And C2Through the series connection point L2Connected in series to form an SL2 branch, an in-phase energy storage bridge arm MT1And MT2Through the series connection point L3An SL3 branch is formed in series, and a branch SL1, a branch SL2 and a branch SL3 form a parallel circuit; the traction transformer 1 is in a three-phase/two-phase wiring form, a three-phase power system is connected to the network side, one end of a first winding a at the traction side is grounded, and the other end of the first winding a at the traction side is connected with the groundOne end of a second winding b at the traction side is connected with a tandem connection point L of the photovoltaic in-phase energy storage device 21Is connected with the other end of the photovoltaic in-phase energy storage device 2 and is connected with the series connection point L of the photovoltaic in-phase energy storage device 22Series connection point L of photovoltaic cophased energy storage device 2 connected and grounded3The in-phase traction bus 3 is connected with the traction network through a traction feeder 4; the control signal output end of the measurement and control unit 5 is respectively connected with the in-phase photovoltaic bridge arm M of the photovoltaic in-phase energy storage device 2S1And MS2Control end and in-phase energy storage bridge arm MT1And MT2Is connected with the control end of the controller.
Preferably, the traction transformer 1 is a SCOTT connection, as shown in fig. 1; as another preference, the traction transformer 1 uses a single three-phase combined connection, as shown in fig. 2; as a further preference, the traction transformer 1 employs Vv wiring, as shown in fig. 3; besides, the traction transformer 1 can be connected in a Vx connection or the like.
Preferably, the photovoltaic bridge arm M is in phaseS1And MS2The power photovoltaic modules PM have the same structure and are all provided with n power photovoltaic modules PM with the same structure1,PM2,…,PMnIs connected with an inductor L in series, and the power photovoltaic module is composed of two IGBT devices TP1And TP2Connected in series with a capacitor CP0Single-phase half-bridge structure formed in parallel on capacitor CP0The side is connected in parallel with the photovoltaic device PV, as shown in FIG. 4, where n ≧ 1.
Preferably, the same-phase energy storage bridge arm MT1And MT2The power energy storage modules TM have the same structure and are all n power energy storage modules TM with the same structure1,TM2,…,TMnIs connected with an inductor L in series, and the power energy storage module is composed of two IGBT devices TT1And TT2Connected in series with a capacitor CT0Single-phase half-bridge structure formed in parallel on capacitor CT0The side is connected in parallel with the energy storage device ESD, as shown in FIG. 5, where n ≧ 1. In this embodiment, the energy storage medium of the energy storage device ESD may be one of electromagnetic energy storage, physical energy storage, and electrochemical energy storage.
It should be noted that, as a specific example, the power of the photovoltaic device PV is usedIn-phase photovoltaic bridge arm M when no or no photovoltaic device PV is presentS1And MS2And the power is converted into a same-phase power supply bridge arm as shown in fig. 6, and the bridge arm can only transmit power at the moment and has no power generation function.
It should be noted that, when the energy storage medium of the energy storage device ESD is a wide voltage range such as a super capacitor, a DC/DC converter needs to be configured to stabilize the power energy storage module TM1,TM2,…,TMnCapacitor CT0The side direct voltage is in a specified range, i.e. the energy storage device ESD is composed of an energy storage medium and a DC/DC converter and passes through DC/DC and a capacitor CT0Forming a parallel connection.
Preferably, a voltage transformer 6 is used to measure the voltage of the in-phase supply bus 3 and a current transformer 7 is used to measure the current of the feeder 4.
The measurement and control unit 5 measures the traction load power S through the voltage transformer 6 and the current transformer 7, accordingly controls the photovoltaic in-phase energy storage device 2, and utilizes regenerative braking energy, load peak load elimination and electric energy quality control.
Example 2
As shown in fig. 7, this embodiment provides a measurement and control unit for implementing embodiment 2, including:
a data acquisition module: for obtaining voltage data and current data transmitted by a voltage transformer 6 and a current transformer 7 and power P of the photovoltaic devicePV；
A calculation module: the active power S of the traction load is obtained through calculation according to the voltage data and the current data;
a first module: used for judging whether active power S of the traction load is less than zero or not, and if so, controlling n power energy storage modules TM1，TM2，…，TMnCharging and controlling n power photovoltaic modules PM1,PM2,…,PMnStandby, otherwise, entering a second module;
a second module: for judging whether active power S of traction load is less than discharge threshold PD+PPVIf yes, controlling n power energy storage modules TM1，TM2，…，TMnStand by and control nPower photovoltaic module PM1,PM2,…,PMnGenerating power, otherwise, entering the third step;
a third module: used for judging whether the active power S of the traction load is smaller than the allowable value P of the negative sequence power of the power gridNIf yes, controlling n power energy storage modules TM1，TM2，…，TMnDischarging and controlling n power photovoltaic modules PM1,PM2,…,PMnGenerating power, otherwise, entering the fourth step;
a fourth module: for controlling n power storage modules TM1，TM2，…，TMnDischarging and controlling n power photovoltaic modules PM1,PM2,…,PMnGenerates electricity and transfers active power to the traction side.
It should be noted that, when the power of the photovoltaic device PV is zero or no photovoltaic device PV is included, the photovoltaic power P in the embodiment isPVIs zero.
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 enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides an electrified railway cophase energy storage power supply system, includes traction transformer (1), photovoltaic cophase energy storage device (2) and sets up current transformer (7) on voltage transformer (6) and traction feeder (4) on cophase traction bus (3), and the measuring terminal of voltage transformer (6), current transformer (7) is connected its characterized in that with the detection signal input of observing and controlling unit (5) respectively: the photovoltaic in-phase energy storage device (2) is composed of an in-phase photovoltaic bridge arm MS1And MS2Capacitor bridge arm C1And C2And in-phase energy storage bridge arm MT1And MT2Composition of photovoltaic bridge arm M in phaseS1And MS2Through the series connection point L1Connected in series to form SL1 branch, capacitor bridge arm C1And C2Through the series connection point L2Connected in series to form an SL2 branch, an in-phase energy storage bridge arm MT1And MT2Through the series connection point L3An SL3 branch is formed in series, and a branch SL1, a branch SL2 and a branch SL3 form a parallel circuit; the traction transformer (1) is in a three-phase/two-phase wiring form, a three-phase power system is connected to the network side, one end of a first winding a at the traction side is grounded, the other end of the first winding a at the traction side is connected with an in-phase traction bus (3), one end of a second winding b at the traction side is connected with a series connection point L of a photovoltaic in-phase energy storage device (2)1Is connected with the other end of the photovoltaic in-phase energy storage device (2) at a series connection point L2A series connection point L of the photovoltaic same-phase energy storage device (2) which is connected and grounded3The in-phase traction bus (3) is connected with the traction network through a traction feeder (4); the control signal output end of the measurement and control unit (5) is respectively connected with the in-phase photovoltaic bridge arm M of the photovoltaic in-phase energy storage device (2)S1And MS2Control end and in-phase energy storage bridge arm MT1And MT2Is connected with the control end of the controller.
2. The in-phase energy storage and supply system for the electrified railway of claim 1, wherein: the in-phase photovoltaic bridge arm MS1And MS2The power photovoltaic modules PM have the same structure and are all provided with n power photovoltaic modules PM with the same structure1,PM2,…,PMnIs connected with an inductor L in series, and the power photovoltaic module is composed of two IGBT devices TP1And TP2Connected in series with a capacitor CP0Single-phase half-bridge structure formed in parallel on capacitor CP0The side is connected in parallel with the photovoltaic device PV, wherein n is more than or equal to 1.
3. The in-phase energy storage and supply system for the electrified railway of claim 1, wherein: the in-phase energy storage bridge arm MT1And MT2The power energy storage modules TM have the same structure and are all n power energy storage modules TM with the same structure1,TM2,…,TMnIs connected with an inductor L in series, and the power energy storage module is composed of two IGBT devices TT1And TT2Connected in series with a capacitor CT0Single-phase half-bridge structure formed in parallel on capacitor CT0The side is connected with an energy storage device ESD in parallel, wherein n is more than or equal to 1.
4. The in-phase energy storage and supply system for the electrified railway of claim 1, wherein: the traction transformer (1) is an SCOTT connection wire, an YNd11 or a Vv connection wire.
5. The in-phase energy storage and supply system for the electrified railway of claim 1, wherein: the voltage transformer (6) is used for measuring the voltage of the in-phase traction bus (3), and the current transformer (7) is used for measuring the current of the traction feeder (4).
6. The in-phase energy storage and supply system for the electrified railway of claim 3, wherein: the energy storage medium of the energy storage device ESD is one of electromagnetic energy storage, physical energy storage or electrochemical energy storage, and when S is larger than or equal to SD+PN+PPV，PT＝(S-SD-PN-PPV) 2; wherein, PN＞0，PD＞0，PPV≥0。
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