CN109435783B - Negative sequence management system for AT power supply mode of electrified railway traction power supply system - Google Patents
Negative sequence management system for AT power supply mode of electrified railway traction power supply system Download PDFInfo
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- CN109435783B CN109435783B CN201811253615.XA CN201811253615A CN109435783B CN 109435783 B CN109435783 B CN 109435783B CN 201811253615 A CN201811253615 A CN 201811253615A CN 109435783 B CN109435783 B CN 109435783B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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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Abstract
A negative sequence management system for an AT power supply mode of an electrified railway traction power supply system aims to economically and effectively solve the problem of the negative sequence of the AT power supply mode, optimize a traction network structure and realize through power supply of a traction substation end. The high-voltage power supply system comprises a traction substation for supplying power to a left power supply arm and a right power supply arm, wherein the traction substation is provided with a balance traction transformer and an alternating current-direct current-alternating current device, a high-voltage incoming line power supply is converted into two-phase power with the rated voltage of 27.5kV and the phase angle of 90 DEG by the balance traction transformer, one phase is used as a T-phase power supply contact net of an AT power supply mode, and the other phase is used as an F-phase power supply positive feeder of the AT power supply mode by outputting a voltage with the phase angle of 180 DEG different from the T-phase by the alternating current-direct current-alternating current-device; and the neutral point of the balance traction transformer is connected with a generalized ground wire.
Description
Technical Field
The invention relates to an electrified railway traction power supply system, in particular to a negative sequence management system applied to an autotransformer (hereinafter referred to as AT) power supply mode of the electrified railway traction power supply system.
Background
The electric traction has the advantages of high efficiency, low energy consumption, no pollution and the like, and is widely applied to railways of various countries in the world, and electrified railways of China adopt a single-phase power frequency (50 Hz) alternating current 25kV power supply system. The traction network adopts a single-phase power supply mode to cause unbalanced three-phase load of a power supply system, and negative sequence influence on the power system is generated; the electric locomotive adopts an alternating current flexible power supply technology, so that the waveform of current and voltage of a power supply system is distorted, and the harmonic wave influence on the power supply system is generated; the traditional electric locomotive adopts a direct current traction motor technology, so that the power factor of a power supply system is low, and the reactive power problem is generated; in addition, because the traction load changes along with the different line gradients, transportation organizations, train operation conditions and the like, the voltage fluctuation of the power system is severe. With the development of electric locomotive technology, alternating current transmission electric locomotives and motor cars are popularized and used in a large scale, and the power factor problem of an electrified railway is basically solved; under the condition that an alternating current transmission electric locomotive and a motor car are adopted in a large quantity at present, compared with the prior art, the harmonic wave with lower times such as 3 times, 5 times and 7 times is obviously changed, the content rate of the harmonic wave is greatly reduced, but the content rate of the harmonic wave with higher times is increased, the harmonic wave is mainly changed due to the fact that the alternating current transmission adopts PWM (pulse width modulation technology) and IGBT (insulated gate bipolar transistor, the triggering frequency reaches 2000 Hz-4000 Hz), and the harmonic wave problem is solved to a certain extent under the large background that a power grid system is continuously enhanced, and high-speed rails and heavy-load railways adopt 220kV or even 330kV power supply in a large quantity. For the negative sequence problem, the negative sequence problem is gradually becoming the key of the electric energy quality problem of the electrified railway due to the specificity of traction load.
The railway traction power supply system in China adopts an in-phase single-side power supply mode, and the traction load of a single power supply arm generates a negative sequence in the power system, and the size of the negative sequence is equivalent to that of the traction load of the power supply arm. In order to solve the negative sequence problem, a common measure is to adopt a non-single-phase traction transformer such as a balance traction transformer, wherein the low-voltage side of the balance traction transformer outputs two-phase voltage, the phase angle of the two-phase voltage is different by 90 degrees, and when the two-phase traction loads of the low-voltage side are in the same traction or regeneration working condition and are equal in size, the related negative sequence influence can be completely counteracted; other non-single-phase traction transformers can counteract part of negative sequence influence when the low-voltage side two-phase traction load is in the same traction or regeneration working condition, for example, the Vv or Ynd11 wiring traction transformer can counteract 50% of negative sequence influence when the traction loads at the two sides are equal in size. However, for the scheme of adopting the non-single-phase traction transformer to solve the negative sequence problem, the problem that the negative sequence influence offset effect is greatly reduced or even no effect is achieved by the two-phase load because the traction load fluctuation is large and the power supply load of different phases at the low voltage side of the traction transformer is often large. In addition, when one phase load is traction or regeneration and the other phase load is regeneration or traction, namely the working conditions of the two phases load are exactly opposite, the negative sequences generated by the two phases load cannot be offset, and superposition amplification is carried out.
The AT power supply mode has the characteristics of strong power transmission capability, long power supply distance, capability of effectively reducing the potential of a steel rail and the interference on a communication line along the line, adaptation to the power supply requirement of a high-power load and the like, and is widely and widely applied to high-speed and heavy-load electrified railways in China. For the AT power supply mode, the power supply voltage on the traction network is 55kV, and the traction load is powered by a T-phase voltage and an F-phase voltage which are rated AT 27.5kV and have 180-degree phase angles of output voltage.
With the development of power electronic devices and control technologies, flexible alternating current power supply technologies are increasingly widely applied, and voltage or current output phases and amplitude values can be adjusted by utilizing the flexible alternating current power supply technologies, so that system trend is controlled, and electric energy quality is improved. For an AT power supply mode, a balance traction transformer is adopted, a three-phase power supply is introduced AT the high-voltage side, two-phase voltage is output AT the low-voltage side, the rated value of the voltage is 27.5kV, and the phase angle phase difference is 90 degrees; then, the phase angle difference of the output two-phase voltage is adjusted to 180 degrees by utilizing a flexible alternating current power supply technology, so that a T-phase voltage and an F-phase voltage required by an AT power supply mode are formed for traction load; in this way, the traction load is decomposed into a T-phase component and an F-phase component, and the negative sequence effect of the traction load formed on the high-voltage side is equal to the difference between the T-phase component and the F-phase component. Because the negative sequence compensation is based on the T phase component and the F phase component of traction load self decomposition, compared with the traditional negative sequence compensation scheme based on two different loads, the problem that the compensation effect caused by two-phase traction load difference is difficult to reach the expected is avoided, and the problem of negative sequence superposition amplification caused by two-phase traction load working conditions is solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a negative sequence management system for an AT power supply mode of an electrified railway traction power supply system, so that the problem of the negative sequence of the AT power supply mode is solved economically and effectively, the traction network structure is optimized, and the through power supply of a traction substation end is realized.
The technical scheme adopted for solving the technical problems is as follows:
the invention relates to a negative sequence management system for an AT power supply mode of an electrified railway traction power supply system, which comprises a traction substation for supplying power to a left power supply arm and a right power supply arm, and is characterized in that: the traction substation is provided with a balance traction transformer and an AC-DC-AC converter, a high-voltage incoming line power supply is converted into two-phase power with the rated voltage value of 27.5kV and the phase angle of 90 DEG by the balance traction transformer, one phase is used as a T-phase power supply for a contact net in an AT power supply mode, and the other phase is used for outputting voltage with the phase angle of 180 DEG from the T-phase power supply as an F-phase power supply for a positive feeder in the AT power supply mode by the AC-DC-AC converter; and the neutral point of the balance traction transformer is connected with a generalized ground wire.
The negative sequence compensation system has the beneficial effects that as the negative sequence compensation of the system is based on the T-phase component and the F-phase component of the self-decomposition of the traction load, compared with the traditional negative sequence compensation method based on two different loads, the problem that the compensation effect caused by the difference of the two-phase traction loads is difficult to reach the expected value is avoided, and the problem of the negative sequence superposition amplification caused by the difference of the working conditions of the two-phase traction loads is solved; the traction transformer adopted by the method is applied to a direct supply mode, and a conventional AT power supply mode traction transformer is not needed, compared with the conventional AT power supply mode traction transformer, the traction transformer is of a double-winding structure, the output voltage of the low-voltage side is 27.5kV, the traction transformer is of a three-winding structure, and the output voltage of the low-voltage side is 2X 27.5kV, so that the traction transformer is simple in structure, low in price and better in economical efficiency; the traction network system is only composed of a T-phase component and an F-phase component, so that the traditional mode of terminal set electric split phase can be canceled, the traction network structure is further optimized, and the through power supply of the traction substation terminal is realized.
Drawings
The specification includes the following two drawings:
FIG. 1 is a schematic diagram of a negative sequence remediation system for an AT power mode of an electrified railway traction power supply system according to the present invention.
Fig. 2 is a schematic diagram of an AT power supply mode of a single-side power supply arm of the traction power supply system of the electrified railway in the negative sequence management system for the AT power supply mode of the traction power supply system of the electrified railway.
The components in the figures and the corresponding labels: traction substation 10, high-voltage incoming line power supply 11, balance traction transformer 12, ac-dc-ac converter 13, left power supply arm 20, right power supply arm 21, catenary 22, generalized ground wire 23, positive feeder 24, AT station 30, first AT section 31, second AT section 32, third AT section 33, autotransformer 34, traction load 35.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Referring to fig. 1, the negative sequence management system for an AT power supply mode of an electrified railway traction power supply system of the present invention includes a traction substation 10 for supplying power to a left power supply arm 20 and a right power supply arm 21, and is characterized in that: the traction substation 10 is provided with a balance traction transformer 12 and an AC-DC-AC converter 13, the high-voltage incoming line power supply 11 is converted into two-phase power with the rated voltage value of 27.5kV and the phase angle difference of 90 DEG through the balance traction transformer 12, one phase is used as a T-phase power supply for the contact net 22 in an AT power supply mode, and the other phase outputs voltage with the phase angle difference of 180 DEG with the T-phase through the AC-DC-AC converter 13 and is used as an F-phase power supply for the positive feeder 14 in the AT power supply mode; the neutral point of the balancing traction transformer 12 is connected to a generalized ground 23.
The T-phase component and the F-phase component are obtained by decomposing the traction load, so that the problem that the compensation effect caused by the difference of the traction loads of two phases is difficult to reach the expected value is avoided, and meanwhile, the problem of negative sequence superposition amplification caused by the difference of the working conditions of the traction loads of two phases is also solved. The direct-supply type balance transformer is simple in structure, low in price, and better in economical efficiency, and output voltage at the low-voltage side is 27.5 kV. The adopted AC/DC/AC converter has better isolation effect.
The generalized ground line 23 includes the ground, rails, PW protection line, and integrated ground line.
The number of AT segments on the left power supply arm 20 and the right power supply arm 21 is AT least one.
The negative sequence treatment effect after the system is adopted is further analyzed by combining with FIG. 2. The single-side power supply arm (the left power supply arm 20 or the right power supply arm 21) is composed of three AT sections, a balance traction transformer 12, an AC-DC-AC converter 13 and a high-voltage power supply 11 are arranged in the traction substation 10, the traction substation 10 supplies power to a traction load 35 through a T-phase power supply and an F-phase power supply, and an autotransformer 34 is arranged in the power supply arm. The traction substation 10 and the nearest autotransformer 34 form a first AT section 31, and the adjacent autotransformers 34 form a second AT section 32 and a third AT section 33 from the near to the far.
According to the specification of GB/T15543 electric energy quality three-phase voltage unbalance, the limit value of the voltage unbalance of the public connection point of the electric power system is that when the electric power network normally operates, the voltage unbalance of the negative sequence is not more than 2% and not more than 4% in short time (short time means 3 s-1 min); the allowable value of the negative sequence voltage unbalance caused by each user of the public connection point is generally 1.3%, and the allowable value is not more than 2.6% in short time.
The AT power supply mode of China is usually formed by 2 AT sections, a model is simplified according to the AT power supply mode, the traction load is assumed to be 1, when the traction load 35 is located in a second AT section 32 far away from the traction substation 10, the currents of a T phase component and an F phase component AT the end of the traction substation 10 are equal, and AT the moment, the negative sequence component generated on the high-voltage side of the traction substation 10 by adopting the system is the difference between the T phase component and the F phase component and is zero; when the traction load 35 is located in the first AT section 31 near the traction substation 10, the values of the T-phase component and the F-phase component of the traction load 35 AT the end of the traction substation 10 continuously change along with the change of the load AT different positions in the AT section, when the load gradually approaches the traction substation 10 from the end of the AT section, the process is approximately a process that the T-phase component changes from 0.5 to 1 and the F-phase component changes from 0.5 to 0, the average value of the currents of the T-phase component and the F-phase component AT the end of the traction substation 10 is 0.75 and 0.25, AT the moment, the negative sequence component generated AT the high voltage side of the traction substation 10 by adopting the system is the difference between the T-phase component and the F-phase component and is 0.5, and the conditions in the first AT section 31 and the second AT section 32 are integrated, the negative sequence component generated on the high-voltage side of the traction substation 10 is 0.25, the maximum power of a single traction load of a high-speed railway or a heavy-load railway of China is about 25MVA, 8 traction loads of the single traction substation are considered, the extreme condition that GB/T15543' the allowable value of the negative sequence voltage unbalance degree of the point is generally 1.3% for each user of a public connection point is met, the short circuit capacity AT the public connection point, namely AT a 220kV or 330kV transformer substation bus for the traction substation, is greater than 3846MVA, and the minimum short circuit capacity of a system AT most 220kV or 330kV transformer substation buses of China is greater than 4000MVA, so that the system can meet the requirement of negative sequence compensation of most traction power supply systems of China. In addition, if the negative sequence compensation effect needs to be further increased, the negative sequence compensation effect can be achieved by adding the AT station 30 on the traction network and increasing the number of AT sections, for example, when the number of AT sections on the power supply arm is increased to 3, and when the traction load 35 is positioned in the third AT section 33 and the second AT section 32 which are far away from the traction substation 10, the currents of the T phase component and the F phase component AT the end of the traction substation 10 are equal, and the negative sequence component generated AT the high voltage side of the traction substation 10 is zero; when the traction load 35 is located in the first AT section 31 close to the traction substation 10, then the negative sequence component generated AT the high-voltage side of the traction substation 10 is 0.5, and when three AT sections are combined, the negative sequence component generated AT the high-voltage side of the substation 10 is 0.167, and is further reduced by 33.2% compared with the case where the power supply arm is composed of 2 AT sections.
The foregoing is intended to illustrate the principles of the negative sequence management system of the present invention for an AT power system of an electrified railway traction power system and is not intended to limit the invention to the particular structure and application scope shown and described, but rather to limit the invention to all corresponding modifications and equivalents which may be employed, as long as they are within the scope of the invention as claimed.
Claims (3)
1. A negative sequence governing system for electrified railway pulls power supply system AT power supply mode, including traction substation (10) that power supply to left side power supply arm (20) and right side power supply arm (21), characterized by: the traction substation (10) is provided with a balance traction transformer (12) and an alternating current-direct current-alternating current device (13), the high-voltage incoming line power supply (11) is converted into two-phase power with the rated voltage value of 27.5kV and the phase angle of 90 DEG through the balance traction transformer (12), one phase serves as a T-phase power supply for a contact net (22) in an AT power supply mode, the other phase passes through the alternating current-direct current-alternating current device (13) and outputs voltage with the phase angle of 180 DEG different from the T-phase power supply for a positive feeder (14) in the AT power supply mode; the neutral point of the balance traction transformer (12) is connected with a generalized ground wire (23).
2. The negative sequence management system for an AT power mode of an electrified railway traction power supply system of claim 1, wherein: the generalized ground wire (23) comprises a ground, a steel rail, a PW protection wire and a comprehensive ground wire.
3. The negative sequence management system for an AT power mode of an electrified railway traction power supply system of claim 1, wherein: the number of AT sections on the left power supply arm (20) and the right power supply arm (21) is AT least one.
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