CN111049142B - Dynamic compensation type railway purifying power supply device - Google Patents
Dynamic compensation type railway purifying power supply device Download PDFInfo
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- CN111049142B CN111049142B CN201911178368.6A CN201911178368A CN111049142B CN 111049142 B CN111049142 B CN 111049142B CN 201911178368 A CN201911178368 A CN 201911178368A CN 111049142 B CN111049142 B CN 111049142B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
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Abstract
The invention discloses a dynamic compensation type railway purification power supply device which comprises a multi-winding power transformer, an alternating current-direct current power supply, a bypass thyristor, a filtering unit and a series transformer, wherein the multi-winding power transformer, the alternating current-direct current power supply, the bypass thyristor, the filtering unit and the series transformer are sequentially connected; the device perfectly solves the problems of the traditional railway purifying power supply, meets the requirement of the railway on the electric energy quality, has the characteristics of small capacity, low cost and the like, and has the functions of fault current limiting, quick bypass, fault distance measurement and positioning by matching with a relay protection device when the load side short-circuit fault occurs.
Description
Technical Field
The invention belongs to the technical field of railway traction high-voltage large-capacity power electronic converter, and particularly relates to a dynamic compensation type railway purification power supply device.
Background
The railway three-phase 10kV system provides electric energy for railway communication, signals, daily work and life, and the quality and reliability of the electric energy play a very critical role in railway operation safety. On the one hand, the existing railway 27.5 kV-to-10 kV power distribution network has the inherent defects of poor stability of power supply voltage, unbalanced voltage, low electric energy quality and the like, and huge potential safety hazards are buried for railway operation. On the other hand, the railway 10kV power grid is supplied with power from the local through the special distribution line, the cost of the laid special line is high, the later maintenance cost is high, the defect is particularly obvious in areas with low power grid density, and even the special line cannot be laid in quite a plurality of places.
In the region with low power grid density in the western part of China, a railway purification power supply device is often used for supplying power to a through and self-closing line 10kV along the railway. The conventional railway purifying power supply device is generally in a topological form of a series multiple structure and a high-low-high parallel structure.
The tandem multiplexing scheme is shown in FIG. 1. The series-connection multiple high-voltage converter utilizes the series connection of the low-voltage single-phase power units to make up the deficiency of the voltage-resisting capability of the IGBT of the power device. The scheme utilizes a front-end multi-winding rectifier transformer to isolate a power grid, and converts a single-phase traction power supply line 27.5kV power supply into a plurality of groups of single-phase alternating-current power supplies; the secondary side output voltage of the transformer is supplied to the power unit for single-phase rectification and single-phase inversion. Each phase output of the converter is output after being inverted and serially superposed by a plurality of power units, and a three-phase alternating current power supply with phase voltage of 5773V and line voltage of 10kV is formed.
The scheme of a high-low-high parallel structure is shown in fig. 2, a rectifier transformer is utilized to convert a single-phase traction power supply line 27.5kV power supply into a single-phase low-voltage alternating voltage to perform single-phase rectification and then charge a direct-current bus support capacitor, and inversion units are divided into three groups, wherein each group comprises a plurality of power unit modules. The three groups of inversion units convert direct-current voltage into single-phase alternating-current voltage with phases sequentially different by 120 degrees, and the output of a 10kV three-phase alternating-current power supply is realized through a single-phase to three-phase booster transformer.
Although the existing railway purification power supply device can solve the problems of difficult power supply and electric energy quality in a railway power grid, the existing railway purification power supply device is a full-power electronic converter device no matter in a serial multiplex type topology or a high-low-high parallel type topology, the capacity generally reaches MW level, the system is very complex and the cost is high. On the premise that the requirements of the railway system on safety and cost are increasingly higher, the two topologies cannot completely meet the requirements.
Disclosure of Invention
The invention creatively provides a railway dynamic compensation type purifying power supply scheme, which can purposefully solve the inherent defects of two purifying power supplies in the existing market and can completely meet the power consumption requirement on the railway.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problem is as follows: a dynamic compensation type railway purification power supply device comprises a multi-winding power transformer, an alternating current-direct current power supply, a bypass thyristor, a filtering unit and a series transformer which are sequentially connected, wherein a primary high-voltage winding of the series transformer is connected in series in a three-phase 10kV loop, and a secondary side of the series transformer is connected with the output end of the alternating current-direct current power supply; the primary side of the multi-winding power transformer is provided with two 27.5kV power supplies of a traction network, and the secondary side is provided with a three-phase 10kV winding for supplying power to a through wire or a self-closing wire and a three-phase low-voltage winding for supplying power to an alternating current, direct current and alternating current power supply; the alternating current-direct current-alternating current power supply generates a standard sine command of required reference voltage by capturing the phase and amplitude of the output voltage of the three-phase 10kV winding, and calculates the dropped fundamental voltage so as to obtain and provide compensation voltage for the series transformer; the bypass thyristor consists of three groups of diodes which are connected in parallel in an inverse manner and have six diodes in total; the filtering unit is arranged on the low-voltage side of the series transformer and used for filtering out higher harmonics in the output of the AC/DC/AC power supply, and consists of a current-limiting inductor, three resistors and three capacitors, wherein a bypass thyristor, the current-limiting inductor and a secondary winding of the series transformer are coupled into a short-circuit current-limiting and rapid bypass loop.
The AC-DC-AC power supply judges the short-circuit fault on the load side by adopting a mode of combining the current instantaneous value and the current change rate of a line: when the AC-DC-AC power supply judges that a short-circuit fault occurs on the load side, the AC-DC-AC power supply enters a short-circuit current suppression mode after the purification power supply device is switched off, a bypass thyristor is quickly conducted, a current-limiting inductor in a filtering unit increases the short-circuit impedance of a system, and the current during the short circuit of the system is suppressed within a controllable range; when the alternating current-direct current-alternating current power supply body has a fault, a control system of the purification power supply device sends a closing signal to the bypass thyristor, the series transformer operates in a current transformer working mode, at the moment, the purification power supply device completely exits, and the system is switched to bypass operation.
The invention has the beneficial effects that:
the dynamic compensation type purification power supply only needs to compensate dynamic voltage drop and low-order harmonic of a power grid, so that the capacity of the device is about 40% of that of a full-power scheme, and the system has great advantages in complexity, volume and cost; the compensation type purification power supply is positioned on the secondary side of the series transformer, which is beneficial to reducing the output voltage of the purification power supply device, thereby greatly improving the compensation capability of the system; and the load-level short-circuit current limitation can be performed through the reasonable configuration of the anti-parallel thyristor valve group, the filter and the series transformer.
The common purification power supply scheme does not have the 10kV bypass function, when the device body has a fault, a control system of the purification power supply device sends a closing signal to the anti-parallel thyristor, a series transformer at the output side of the purification power supply operates in a current transformer working mode, at the moment, the purification power supply completely exits, and the system is switched to a bypass operation mode.
Drawings
FIG. 1 shows a conventional tandem multiplexing architecture;
FIG. 2 shows a conventional high-low-high parallel structure;
FIG. 3 shows the structure of a preceding stage 27.5kV power transformer in the present invention;
FIG. 4 is a topology diagram of the present invention;
fig. 5 is a schematic block diagram of the application of the present invention in a railway.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
With the high-speed development of the railway industry in China and the implementation of the western major development strategy, the railway purification power supply is more applied to the railway industry, but the traditional purification power supply with the series-connection multiplexing structure and the high-low-high parallel structure cannot completely meet the requirements of the railway, and has inherent chronic diseases of complex scheme, low reliability, no bypass, high cost and the like.
Fig. 1 and 2 show two common approaches for purifying power for railways. It can be seen from the figure that both schemes are full-power electronic schemes, devices are various, a system has no bypass scheme, once a load side is short-circuited or an equipment body is in fault, a purification power supply can only exit, and a 10kV power grid is in power failure.
Referring to fig. 3 to 5, the invention discloses a dynamic compensation type railway purification power supply device.
FIG. 3 is a schematic diagram of a front stage 27.5kV power transformer in the invention. A multi-winding oil-immersed transformer is adopted, the high-voltage side of a primary side is 27.5kV of 2 paths introduced from traction, one group of secondary sides is a three-phase 10kV winding, the other group is a low-voltage 660V winding, and the wiring form of a power transformer is D11 yn. The design combines the main power supply 27.5kV/10kV transformer and the 10kV/660V transformer into a single transformer, thereby greatly saving the space of a traction substation and reducing the design cost.
Fig. 4 is a schematic diagram of the topology of the dynamic compensation type purification power supply in the present invention. The topology mainly comprises a multi-winding power transformer, an AC/DC/AC power supply B1, a bypass thyristor B2 (bidirectional anti-parallel thyristor), a filter unit B3 and a series transformer B4.
The compensation voltage output by the AC-DC-AC power supply B1 is filtered by the filtering unit B3 and then output to the secondary side of the series transformer B4, and the primary side of the series transformer is connected in series with a 10kV power grid. The alternating current-direct current-alternating current power supply B1 generates a standard sine command of required reference voltage by capturing the phase and amplitude of the output voltage of the three-phase 10kV winding A2, calculates the dropped fundamental voltage, and accordingly obtains and provides compensation voltage for the series transformer B4.
The bypass thyristor B2 is started when the load side fails or the body fails, and forms a rapid bypass and current-limiting loop together with the secondary winding of the series transformer, so that uninterrupted bypass switching on the load side is completed.
The bypass thyristor B2 is composed of two diodes TT1 and TT2, two diodes TT3 and TT4 and two diodes TT5 and TT6 which are connected in parallel in an opposite direction.
The filter unit B3 is arranged on the low-voltage side of the series transformer B4 and used for filtering out higher harmonics in the output of an alternating-current and alternating-current power supply B1, and consists of a current-limiting inductor L2-L4, three resistors Rf and three capacitors Cf, wherein a bypass thyristor B2, the current-limiting inductors L2-L4 and a secondary winding of the series transformer B4 are coupled to form a short-circuit current-limiting and fast bypass loop.
The invention can change the 27.5kV traction network into three-phase 10kV and multi-group low voltage through the design of a special power transformer, wherein the power transformer has two groups of outputs, one group supplies power to a rear stage through or self-closing line load, and the other group supplies power to a compensation type purifying power supply; the dynamic compensation type purification power supply provides power grid drop compensation voltage and low-order harmonic compensation for a 10kV power grid through a series transformer.
The dynamic compensation type purification power supply is used as a 10kV power quality comprehensive treatment device when working normally, and can be used as a fault current limiting device when a load side is short-circuited, and is matched with a subsequent relay protection device to carry out fault distance measurement and positioning; when the body fails, the dynamic compensation type purification power supply can be quickly cut off from the power supply system to wait for automatic recovery of the failure or manual maintenance.
The AC/DC power supply B1 judges the short-circuit fault on the load side by adopting a mode of combining the current instantaneous value and the current change rate of a line: when the AC/DC/AC power supply B1 judges that a short-circuit fault occurs on the load side, the power supply device is switched off and enters a short-circuit current suppression mode, the bypass thyristor B2 is quickly switched on, and L2-L4 in the filter unit B3 are current-limiting inductors at the moment, so that the short-circuit impedance of the system is increased, and the current during the short circuit of the system is suppressed within a controllable range; when the alternating current-direct current-alternating current power supply B1 body has a fault, the control system sends a closing signal to the bypass thyristor B2, the series transformer B4 operates in the current transformer working mode, at the moment, the purification power supply device completely exits, and the system is switched to bypass operation.
The technical scheme of the invention has the following technical characteristics:
and generating a standard sine command of the required reference voltage by capturing the phase and amplitude of the phase voltage in the 10kV system, and calculating the dropped fundamental voltage so as to obtain the compensation voltage. By adopting split-phase voltage compensation control, the three-phase voltage of a 10kV power grid system can be flexibly compensated.
The filtering unit is arranged on the low-voltage side of the series transformer and is a low-pass filter, and higher harmonics are completely filtered out, so that the work of the series transformer is not influenced by the harmonics. The influence of the filter on the phase delay and amplitude attenuation of the compensation voltage can be reduced to the minimum through the optimal design of filter parameters and a controller.
The method for judging the short circuit fault on the load side adopts a mode of combining the current instantaneous value and the current change rate of a line, thereby not only avoiding the influence of electromagnetic interference such as thunder and lightning, but also ensuring the correct judgment rate of the rear-stage short circuit.
When the load side has a short-circuit fault, the control system switches off the IGBT module of the purification power supply device, then enters a short-circuit current suppression mode, and quickly switches on the bidirectional anti-parallel thyristor, and the L2-L4 in the filter are current-limiting inductors, so that the short-circuit impedance of the system is increased, and the short-circuit current of the system is suppressed within a controllable range.
The system can recover the voltage fluctuation to the normal condition in a very short time, reduces the influence on the sensitive load to the maximum extent, ensures the reliable power supply of the load along the railway, and has good dynamic regulation performance.
The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.
Claims (1)
1. The utility model provides a dynamic compensation formula railway purifies power supply unit which characterized in that: the power transformer comprises a multi-winding power transformer, an alternating current-direct current-alternating current power supply (B1), a bypass thyristor (B2), a filter unit (B3) and a series transformer (B4) which are connected in sequence, wherein a primary high-voltage winding of the series transformer (B4) is connected in series in a three-phase 10kV loop, and a secondary side of the series transformer is connected with an output end of an alternating current-direct current-alternating current power supply (B1);
the primary side of the multi-winding power transformer is a traction network two-way 27.5kV power supply (A1), and the secondary side of the multi-winding power transformer is a three-phase 10kV winding (A2) for supplying power to a through wire or a self-closing wire and a three-phase low-voltage winding (A3) for supplying power to an alternating current and direct current power supply (B1);
the alternating current-direct current-alternating current power supply (B1) generates a standard sine command by capturing the phase and amplitude of the output voltage of the three-phase 10kV winding (A2), calculates the dropped fundamental voltage and provides a compensation voltage for the series transformer (B4);
the bypass thyristor (B2) is composed of three groups of two diodes (TT 1-TT 2), (TT 3-TT 4) and (TT 5-TT 6) which are connected in parallel in an opposite direction;
the filter unit (B3) is arranged on the low-voltage side of the series transformer (B4) and used for filtering high-order harmonics in the output of an alternating-current power supply (B1), and consists of current-limiting inductors (L2-L4), three resistors (Rf) and three capacitors (Cf), wherein a bypass thyristor (B2), the current-limiting inductors (L2-L4) and secondary windings of the series transformer (B4) are coupled to form a short-circuit current-limiting and rapid bypass loop;
the alternating current-direct current power supply (B1) judges the short-circuit fault of the load side by adopting a mode of combining the current instantaneous value and the current change rate of a line, when the alternating current-direct current power supply (B1) judges that the short-circuit fault occurs on the load side, the alternating current-direct current power supply (B1) breaks the purification power supply device and then enters a short-circuit current suppression mode, the bypass thyristor (B2) is quickly conducted, the current limiting inductor (L2-L4) increases the short-circuit impedance of the system, the current during the short circuit of the system is suppressed within a controllable range, when the alternating current-direct current power supply (B1) has the fault, the purification power supply device sends a closing signal to the bypass thyristor (B2), the series transformer (B4) operates in a current transformer working mode, at the moment, the purification power supply device completely exits, and the system is switched to bypass operation.
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| CN201911178368.6A CN111049142B (en) | 2019-11-27 | 2019-11-27 | Dynamic compensation type railway purifying power supply device |
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| CN201911178368.6A CN111049142B (en) | 2019-11-27 | 2019-11-27 | Dynamic compensation type railway purifying power supply device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021035A (en) * | 1995-05-31 | 2000-02-01 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| CN204615400U (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | There is the Power Quality Comprehensive Treatment Device of short-circuit current-limiting function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947597A (en) * | 2017-11-28 | 2018-04-20 | 陕西兴安润通电气化有限公司 | A kind of multifunctional railway power conditioner |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021035A (en) * | 1995-05-31 | 2000-02-01 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| CN204615400U (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | There is the Power Quality Comprehensive Treatment Device of short-circuit current-limiting function |
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