CN216851312U - New energy access flexible traction power supply system without output transformer - Google Patents
New energy access flexible traction power supply system without output transformer Download PDFInfo
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- CN216851312U CN216851312U CN202123238467.4U CN202123238467U CN216851312U CN 216851312 U CN216851312 U CN 216851312U CN 202123238467 U CN202123238467 U CN 202123238467U CN 216851312 U CN216851312 U CN 216851312U
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Abstract
The utility model discloses a new energy access flexible traction power supply system without an output transformer, which belongs to the technical field of new energy access power supply, and comprises a flexible traction transformer subsystem, a cascade inverter subsystem, a second direct current bus, a direct current conversion subsystem, a first direct current bus and a new energy power generation subsystem which are connected in sequence; one end of the flexible traction transformer subsystem is connected with a three-phase power grid, and the other end of the flexible traction transformer subsystem is connected with a contact network; the utility model provides a traditional new forms of energy insert the problem that needs output transformer when pulling power supply system, can effectively the lowering system to the requirement of corollary equipment, eliminate the maintenance and the maintenance cost of transformer, simultaneously, owing to adopt power electronic converter and flexible traction transformer to link to each other, have phase place, the completely controllable characteristics of frequency, the fault-tolerant ability is stronger.
Description
Technical Field
The utility model belongs to the technical field of the new forms of energy insert power supply, especially, relate to a flexible power supply system that pulls is inserted to no output transformer's new forms of energy.
Background
The electrified railway business of China develops rapidly in recent years: by the end of 2020, the electric railway business mileage of China breaks through 10 kilometers, wherein the business mileage of a high-speed railway reaches 3.8 kilometers. Although the rapid development of the electrified railway is convenient for the public to go out, the rapid development of the electrified railway is also one of the key fields of carbon emission, and the demand of the rapid development of the electrified railway on energy is also increasing. Therefore, in order to realize the "carbon neutralization" vision, it is urgently needed to optimize the energy structure for the electrified railway and to vigorously develop new energy technology so as to improve the comprehensive utilization efficiency of energy.
The electrified railway provides energy for train operation through a contact network, and in order to utilize new energy, a new energy power generation system can be connected into a traction power supply system. Taking a photovoltaic new energy power generation system as an example, two access modes which are widely applied at present are as follows: three-phase inverter and back-to-back single phase converter. However, no matter a three-phase inverter access scheme or a back-to-back single-phase converter access scheme is adopted, the traditional non-through type traction power supply system with electric phase splitting is adopted, and a new energy access scheme aiming at the through type traction power supply system is not paid attention at present; meanwhile, the two schemes both need to be provided with a large-capacity transformer, so that the size and the mass are large, the occupied area is wide, the manufacturing cost is high, and in addition, the large overhaul and maintenance cost is generated; in addition, because the transformer is adopted to realize grid connection, the frequency and the phase of the output voltage and the voltage of a contact network are difficult to be completely consistent, and potential safety hazards are generated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of no output transformer's new forms of energy insert flexible traction power supply system has solved the problem that traditional new forms of energy need output transformer when inserting traction power supply system, can effectively reduce system to the requirement of corollary equipment, eliminates the maintenance and the maintenance cost of transformer, simultaneously, owing to adopt power electronic converter and flexible traction transformer to link to each other, has the characteristics that phase place, frequency are controllable completely, and the fault-tolerant ability is stronger.
In order to achieve the purpose of the invention, the utility model adopts the technical scheme that:
the utility model provides a new energy access flexible traction power supply system without an output transformer, which comprises a flexible traction transformer subsystem, a cascade inverter subsystem, a second direct current bus, a direct current conversion subsystem, a first direct current bus and a new energy power generation subsystem which are connected in sequence;
one end of the flexible traction transformer subsystem is connected with a three-phase power grid, and the other end of the flexible traction transformer subsystem is connected with a contact net.
The utility model has the advantages that: the utility model provides a new energy access flexible traction power supply system without an output transformer, which completely cancels the link of a boost output transformer required when the traditional new energy power generation system is accessed, saves the maintenance and overhaul cost of the transformer and reduces the volume and the weight of a substation system; the utility model adopts the multi-module cascade inverter which can control the frequency, the amplitude and the phase of the output voltage to be directly connected with the output side of the flexible transformer, thereby reducing the grid-connected difficulty of the new energy power generation system; the scheme has the advantages of few conversion stages of electric energy generated by the new energy power generation system, simple structure and control and higher energy utilization rate.
Further, the flexible traction transformer subsystem comprises an energy-saving traction transformer, a matching transformer and a three-phase-single-phase converter;
the primary side of the energy-saving traction transformer is connected with a three-phase power grid, and the secondary side of the energy-saving traction transformer is connected with the primary side of the matching transformer; the secondary side of the matching transformer is connected with one end of the three-phase-single-phase converter; and the other end of the three-phase to single-phase converter is respectively connected with the cascade inverter subsystem and the overhead contact system.
The beneficial effect of adopting the further scheme is as follows: the flexible traction transformer subsystem provides an access point for the new energy subsystem to access flexible traction power supply through the first direct current bus, the direct current conversion subsystem, the second direct current bus and the cascade inverter subsystem.
Further, the three-phase to single-phase converter includes a first rectifier AC/DC and a first inverter DC/AC;
one end of the first rectifier AC/DC is connected with the secondary side of the matching transformer; the other end of the first rectifier AC/DC is connected with one end of a first inverter DC/AC; and the other end of the first inverter DC/AC is respectively connected with the cascade inverter subsystem and the overhead line system.
The beneficial effect of adopting the further scheme is as follows: the three-phase-single-phase converter processes the alternating current regulated by the traction transformer and the matching transformer of the three-phase power grid and outputs the processed alternating current to a contact net for power supply.
Further, the cascade inverter subsystem comprises n inverters which are cascaded in sequence;
the positive input end and the negative input end of each inverter are respectively connected with the positive pole line and the negative pole line of a second direct current bus in a one-to-one correspondence manner, and the ith inverter AiA of (A)iP terminal and A of the i-1 th inverteri-1N end is connected, and the inverter AiA of (A)iN terminal and A of the (i + 1) th inverteri+1P terminal is connected, when i is 1, the inverter A1A of (A)1The p end is respectively connected with the other end of the first inverter DC/AC and a contact net through an inductor, and when i is equal to n, the inverter AnA of (A)nAnd the N terminal is grounded, wherein i is 1,2,3, … N, and N is the total number of inverters in the cascade inverter subsystem.
The beneficial effect of adopting the further scheme is as follows: each inverter in the cascade inverter subsystem is a single-phase power electronic inverter, the input voltage is obtained from the second direct-current bus, the single-phase alternating-current voltage is inverted into a single-phase alternating-current voltage with a certain size through a Sinusoidal Pulse Width Modulation (SPWM) or Space Vector Pulse Width Modulation (SVPWM) modulation technology, and the sum of the output voltages of all the submodules is the total voltage output by the cascade inverter.
Further, the direct current conversion subsystem comprises m Boost modules connected in sequence;
the jth Boost module comprises an inductor LjDiode DjInsulated gate bipolar transistor TjAnd a capacitor Cj(ii) a The inductance LjIs connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode DjAnode and insulated gate bipolar transistor TjIs connected with the collector of the collector; the diode DjRespectively with the capacitor CjOne terminal of (1), a capacitor Cj-1Another terminal of (1), an insulated gate bipolar transistor (T)j-1The emitter of the first direct current bus is connected with the negative pole line of the first direct current bus; the insulated gate bipolar transistor TjRespectively with a capacitor CjAnother end of the first DC bus, a negative electrode line of the first DC bus, and a diode Dj+1Negative electrode of (2) and capacitor Cj+1Is connected with one end of the connecting rod; the insulated gate bipolar transistor TjThe grid electrode of the grid electrode is externally connected with a PWM control signal; when j is 1, the inductance L1Is connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode D1And an insulated gate bipolar transistor T1Is connected with the collector of the collector; the diode D1Respectively with the capacitor C1One end of the first direct current bus is connected with a positive electrode wire of the second direct current bus; the capacitor C1The other end of the first and second electrodes is respectively connected with a negative electrode line of the first direct current bus and an insulated gate bipolar transistor T1Emitter and diode D of2Negative electrode of (2) and capacitor C2Is connected, when j ═ m, the inductance L ismIs connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode DmAnode and insulated gate bipolar transistor TmIs connected with the collector of the collector; the diode DmRespectively with the capacitor CmOne end of (1), a negative electrode line of the first direct current bus, and an insulated gate bipolar transistor (T)m-1And an emitter electrodeCapacitor Cm-1The other end of the first and second connecting rods is connected; the capacitor CmAnd the other end of the first and second electrodes are respectively connected with an insulated gate bipolar transistor TmThe emitter of the first direct current bus and the negative pole line of the second direct current bus are connected, wherein j is 1,2,3 … m, and m is the total number of Boost modules in the direct current conversion subsystem.
The beneficial effect of adopting the further scheme is as follows: a Boost module arranged in the direct current conversion subsystem is determined according to the power grade of a new energy power generation system in engineering practice; if the voltage level of the second direct current bus is too high, the model selection and control difficulty of a power switch device in the cascade inverter subsystem is increased, and the requirement on the insulation capacity of the system is higher; if the voltage level is too low, the number of the Boost modules and the number of the power switching devices are greatly increased, the construction cost is increased, and the number of the Boost modules is flexibly determined according to the actual engineering.
Further, the new energy power generation subsystem comprises a direct current conversion module and a new energy power generation device;
one end of the direct current conversion module is connected with the first direct current bus, and the other end of the direct current conversion module is connected with the new energy power generation device.
The beneficial effect of adopting the further scheme is as follows: the new energy power generation subsystem generates power through the new energy power generation device and supplies power to the traction network through the flexible traction transformer subsystem.
Further, the direct current conversion module comprises an inductor L, a diode D, a capacitor C and an insulated gate bipolar transistor T;
one end of the inductor is connected with the positive end of the new energy power generation device, and the other end of the inductor is connected with the positive electrode of the diode D and the collector electrode of the insulated gate bipolar transistor T respectively; the cathode of the diode is respectively connected with one end of the capacitor C and the positive electrode line of the first direct current bus; the other end of the capacitor C is respectively connected with an emitting electrode of the insulated gate bipolar transistor T, a negative end of the new energy power generation device and a negative electrode line of the first direct current bus; and the grid electrode of the insulated gate bipolar transistor T is externally connected with a PWM control signal.
The beneficial effect of adopting the further scheme is as follows: the direct current conversion module can completely cancel an output transformer link required when the traditional new energy is connected into the traction power supply system, can effectively reduce the requirement of the system on corollary equipment, and eliminates the overhaul and maintenance cost of the transformer; meanwhile, as the power electronic converter is connected with the flexible traction transformer, the flexible traction transformer has the characteristics of completely controllable phase and frequency and strong fault-tolerant capability; the direct current conversion module obtains different boosting proportions by artificially controlling the turn-on time of the insulated gate bipolar transistor T in one switching period
Drawings
Fig. 1 is the embodiment of the present invention provides a schematic structural diagram of a new energy source access flexible traction power supply system without an output transformer.
Fig. 2 is a schematic structural diagram of the dc conversion subsystem according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the dc conversion module according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all inventions contemplated by the present invention are protected.
As shown in fig. 1, in an embodiment of the present invention, the present invention provides a new energy access flexible traction power supply system without an output transformer, which includes a flexible traction transformer subsystem, a cascade inverter subsystem, a second dc bus, a dc conversion subsystem, a first dc bus and a new energy power generation subsystem, which are connected in sequence;
one end of the flexible traction transformer subsystem is connected with a three-phase power grid, and the other end of the flexible traction transformer subsystem is connected with a contact network;
the flexible traction transformer subsystem comprises an energy-saving traction transformer, a matching transformer and a three-phase-single-phase converter;
the primary side of the energy-saving traction transformer is connected with a three-phase power grid, and the secondary side of the energy-saving traction transformer is connected with the primary side of the matching transformer; the secondary side of the matching transformer is connected with one end of the three-phase-single-phase converter; the other end of the three-phase-single-phase converter is respectively connected with the cascade inverter subsystem and the overhead contact system;
the three-phase to single-phase converter comprises a first rectifier AC/DC and a first inverter DC/AC;
one end of the first rectifier AC/DC is connected with the secondary side of the matching transformer; the other end of the first rectifier AC/DC is connected with one end of a first inverter DC/AC; the other end of the first inverter DC/AC is respectively connected with the cascade inverter subsystem and the overhead line system;
the cascade inverter subsystem comprises n inverters which are cascaded in sequence;
the positive input end and the negative input end of each inverter are respectively connected with the positive line and the negative line of a second direct current bus in a one-to-one correspondence mode, and the ith inverter AiA of (A)iP terminal and A of the i-1 th inverteri-1N end is connected, and the inverter AiA of (A)iN terminal and A of the (i + 1) th inverteri+1P terminal is connected, when i is 1, the inverter A1A of (A)1The p end is respectively connected with the other end of the first inverter DC/AC and a contact net through an inductor, and when i is equal to n, the inverter AnA of (A)nThe N end is grounded, wherein i is 1,2,3, … N, and N is the total number of inverters in the cascade inverter subsystem;
each inverter in the cascade inverter subsystem is a PWM converter, the topological structure of the cascade inverter subsystem can be a two-level structure, a three-level structure or a higher-level structure, and the cascade inverter subsystem can be flexibly selected according to the actual engineering;
the direct current conversion subsystem comprises m Boost modules which are connected in sequence;
the jth Boost module comprises an inductor LjDiode DjInsulated gate bipolar transistor TjAnd a capacitor Cj(ii) a The inductance LjIs connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode DjAnode and insulated gate bipolar transistor TjIs connected with the collector of the collector; the diode DjRespectively with the capacitor CjOne terminal of (1), a capacitor Cj-1Another terminal of (1), an insulated gate bipolar transistor (T)j-1The emitter of the first direct current bus is connected with the negative pole line of the first direct current bus; the insulated gate bipolar transistor TjRespectively with a capacitor CjThe other end of the first DC bus, the negative electrode line of the first DC bus, and a diode Dj+1Negative electrode of (2) and capacitor Cj+1Is connected with one end of the connecting rod; the insulated gate bipolar transistor TjThe grid electrode of the grid electrode is externally connected with a PWM control signal; when j is 1, the inductance L1Is connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode D1Anode and insulated gate bipolar transistor T1Is connected with the collector of the collector; the diode D1Respectively with a capacitor C1One end of the first direct current bus is connected with a positive electrode wire of the second direct current bus; the capacitor C1The other end of the first and second electrodes is respectively connected with a negative electrode line of the first direct current bus and an insulated gate bipolar transistor T1Emitter, diode D2Negative electrode of (2) and capacitor C2Is connected, when j equals m, the inductance L ismIs connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode DmAnode and insulated gate bipolar transistor TmIs connected with the collector of the collector; the diode DmRespectively with the capacitor CmOne end of the first direct current bus, the negative electrode line of the first direct current bus, and the insulated gate bipolar transistor Tm-1Emitter and capacitor Cm-1The other end of the first and second connecting rods is connected; the capacitor CmRespectively connected with an insulated gate bipolar transistor TmThe emitter of the first direct current bus is connected with the cathode line of the second direct current bus, wherein j is 1,2,3 … m, and m is the total number of Boost modules in the direct current conversion subsystem;
the topological structure of each direct current converter in the direct current conversion subsystem comprises but is not limited to a Boost type booster circuit and a Buck-Boost type booster circuit;
the new energy power generation subsystem comprises a direct current conversion module and a new energy power generation device;
one end of the direct current conversion module is connected with the first direct current bus, and the other end of the direct current conversion module is connected with the new energy power generation device;
the direct current conversion module comprises an inductor L, a diode D, a capacitor C and an insulated gate bipolar transistor T;
one end of the inductor is connected with the positive end of the new energy power generation device, and the other end of the inductor is connected with the positive electrode of the diode D and the collector electrode of the insulated gate bipolar transistor T respectively; the cathode of the diode is respectively connected with one end of the capacitor C and the positive electrode line of the first direct current bus; the other end of the capacitor C is respectively connected with an emitting electrode of the insulated gate bipolar transistor T, a negative end of the new energy power generation device and a negative electrode line of the first direct current bus; the grid electrode of the insulated gate bipolar transistor T is externally connected with a PWM control signal;
the new energy power generation device selects and sets new energy power generation devices such as a photovoltaic power generation device and a wind power generation device according to the geographical environment suitability degree.
The utility model discloses a theory of operation does: inputting electric energy generated by the new energy Power generation device into a direct current conversion module, outputting direct current voltage as input voltage of a direct current conversion subsystem by utilizing Maximum Power Point Tracking (MPPT) technology, and inputting the direct current voltage into the direct current conversion subsystem through a first direct current bus; the direct current conversion subsystem is a boost converter and is responsible for raising the direct current voltage output by the direct current conversion module to a certain level and connecting the direct current voltage to a second direct current bus, the direct current side of the cascade inverter subsystem is connected with the second direct current bus, the direct current voltage on the cascade inverter subsystem is inverted into the alternating current voltage with the voltage level of 27.5kV required by a traction network by using a certain control technology, and the access of new energy to the flexible traction power supply system is realized.
The utility model has the advantages that: the utility model provides a new energy access flexible traction power supply system without an output transformer, which completely cancels the link of a boost output transformer required when the traditional new energy power generation system is accessed, saves the maintenance and overhaul cost of the transformer and reduces the volume and the weight of a substation system; the utility model adopts the multi-module cascade inverter which can control the frequency, the amplitude and the phase of the output voltage to be directly connected with the output side of the flexible transformer, thereby reducing the grid-connected difficulty of the new energy power generation system; the scheme has the advantages of few conversion stages of electric energy generated by the new energy power generation system, simple structure and control and higher energy utilization rate.
Claims (7)
1. A new energy access flexible traction power supply system without an output transformer is characterized by comprising a flexible traction transformer subsystem, a cascade inverter subsystem, a second direct current bus, a direct current conversion subsystem, a first direct current bus and a new energy power generation subsystem which are sequentially connected;
one end of the flexible traction transformer subsystem is connected with a three-phase power grid, and the other end of the flexible traction transformer subsystem is connected with a contact net.
2. The new energy access flexible traction power supply system without the output transformer of claim 1, wherein the flexible traction transformer subsystem comprises an energy-saving traction transformer, a matching transformer and a three-phase-single-phase converter;
the primary side of the energy-saving traction transformer is connected with a three-phase power grid, and the secondary side of the energy-saving traction transformer is connected with the primary side of the matching transformer; the secondary side of the matching transformer is connected with one end of the three-phase-single-phase converter; and the other end of the three-phase to single-phase converter is respectively connected with the cascade inverter subsystem and the contact network.
3. The new energy access flexible traction power supply system without the output transformer of claim 2, wherein the three-phase to single-phase converter comprises a first rectifier AC/DC and a first inverter DC/AC;
one end of the first rectifier AC/DC is connected with the secondary side of the matching transformer; the other end of the first rectifier AC/DC is connected with one end of a first inverter DC/AC; and the other end of the first inverter DC/AC is respectively connected with the cascade inverter subsystem and the overhead line system.
4. The new energy access flexible traction power supply system without the output transformer of claim 3, wherein the cascaded inverter subsystem comprises n sequentially cascaded inverters;
the positive input end and the negative input end of each inverter are respectively connected with the positive line and the negative line of a second direct current bus in a one-to-one correspondence mode, and the ith inverter AiA of (A)iP terminal and A of the i-1 th inverteri-1N terminal is connected, and the inverter AiA of (A)iN terminal and A of the (i + 1) th inverteri+1P terminal is connected, when i is 1, the inverter A1A of (A)1The p end is respectively connected with the other end of the first inverter DC/AC and a contact net through an inductor, and when i is equal to n, the inverter AnA of (A)nAnd the N terminal is grounded, wherein i is 1,2,3, … N, and N is the total number of inverters in the cascade inverter subsystem.
5. The new energy access flexible traction power supply system without the output transformer of claim 4, wherein the direct current conversion subsystem comprises m Boost modules connected in sequence;
the jth Boost module comprises an inductor LjDiode DjInsulated gate bipolar transistor TjAnd a capacitor Cj(ii) a The inductance LjIs connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode DjAnode and insulated gate bipolar transistor TjIs connected with the collector of the collector; the diode DjRespectively with the capacitor CjOne terminal of (1), a capacitor Cj-1Another terminal of (1), an insulated gate bipolar transistor (T)j-1The emitter of the first direct current bus is connected with the negative pole line of the first direct current bus; the insulated gate bipolar transistor TjRespectively with a capacitor CjAnother end of (1), the first direct currentNegative line of bus and diode Dj+1Negative electrode of (2) and capacitor Cj+1Is connected with one end of the connecting rod; the insulated gate bipolar transistor TjThe grid electrode of the grid electrode is externally connected with a PWM control signal; when j is 1, the inductance L1Is connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode D1Anode and insulated gate bipolar transistor T1Is connected with the collector of the collector; the diode D1Respectively with the capacitor C1One end of the first direct current bus is connected with a positive electrode wire of the second direct current bus; the capacitor C1The other end of the first and second electrodes is respectively connected with a negative electrode line of the first direct current bus and an insulated gate bipolar transistor T1Emitter, diode D2Negative electrode of (2) and capacitor C2Is connected, when j ═ m, the inductance L ismIs connected with the positive electrode line of the first DC bus, and the other end thereof is respectively connected with the diode DmAnode and insulated gate bipolar transistor TmIs connected with the collector of the collector; the diode DmRespectively with the capacitor CmOne end of the first direct current bus, the negative electrode line of the first direct current bus, and the insulated gate bipolar transistor Tm-1Emitter and capacitor Cm-1The other end of the first and second connecting rods is connected; the capacitor CmAnd the other end of the first and second electrodes are respectively connected with an insulated gate bipolar transistor TmThe emitter of the first direct current bus and the negative pole line of the second direct current bus are connected, wherein j is 1,2,3 … m, and m is the total number of Boost modules in the direct current conversion subsystem.
6. The new energy access flexible traction power supply system without the output transformer of claim 5, wherein the new energy power generation subsystem comprises a direct current conversion module and a new energy power generation device;
one end of the direct current conversion module is connected with the first direct current bus, and the other end of the direct current conversion module is connected with the new energy power generation device.
7. The new energy access flexible traction power supply system without the output transformer of claim 6, wherein the direct current conversion module comprises an inductor L, a diode D, a capacitor C and an insulated gate bipolar transistor T;
one end of the inductor is connected with the positive electrode end of the new energy power generation device, and the other end of the inductor is connected with the positive electrode of the diode D and the collector electrode of the insulated gate bipolar transistor T respectively; the cathode of the diode is respectively connected with one end of the capacitor C and the positive electrode line of the first direct current bus; the other end of the capacitor C is respectively connected with an emitting electrode of the insulated gate bipolar transistor T, a negative end of the new energy power generation device and a negative electrode line of the first direct current bus; and the grid electrode of the insulated gate bipolar transistor T is externally connected with a PWM control signal.
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| CN202123238467.4U CN216851312U (en) | 2021-12-21 | 2021-12-21 | New energy access flexible traction power supply system without output transformer |
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| CN202123238467.4U CN216851312U (en) | 2021-12-21 | 2021-12-21 | New energy access flexible traction power supply system without output transformer |
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