CN112098705B - System and method for rapidly identifying AC/DC power supply system - Google Patents

System and method for rapidly identifying AC/DC power supply system Download PDF

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CN112098705B
CN112098705B CN202010980859.9A CN202010980859A CN112098705B CN 112098705 B CN112098705 B CN 112098705B CN 202010980859 A CN202010980859 A CN 202010980859A CN 112098705 B CN112098705 B CN 112098705B
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current
network voltage
voltage
power supply
supply system
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CN112098705A (en
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尚敬
邹东海
徐绍龙
甘韦韦
郭维
周杨
黄浩
陈科
魏超
田乐
王俊然
马晓东
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Zhuzhou CRRC Times Electric Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/02—Measuring effective values, i.e. root-mean-square values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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Abstract

The invention relates to the field of rail transit electrical equipment, in particular to a system and a method for rapidly identifying an alternating current-direct current power supply system. The invention provides an alternating current-direct current power supply system rapid identification system, which comprises a network voltage transformer, a traction converter and a controller, wherein the network voltage transformer is used for detecting and acquiring a network voltage synchronous signal of a pantograph-catenary and outputting the network voltage synchronous signal to the traction converter; the voltage sensor is used for detecting and acquiring a network voltage synchronous signal of the pantograph-catenary and outputting the network voltage synchronous signal to the traction converter; and the traction converter respectively calculates corresponding net pressure effective values and net flattening mean values according to net pressure synchronous signals collected by the net pressure mutual inductor and the voltage sensor, and judges the bow net power supply system according to the ratio of the net pressure effective values to the net flattening mean values. The system and the method for rapidly identifying the alternating current and direct current power supply system can enable the electric locomotive to rapidly and accurately identify the alternating current and direct current power supply system in a plurality of periods, automatically complete the switching of the locomotive power supply system according to the identification result, meet the field application requirements, and have wide application prospects.

Description

System and method for rapidly identifying AC/DC power supply system
Technical Field
The invention relates to the field of rail transit electrical equipment, in particular to a system and a method for rapidly identifying an alternating current-direct current power supply system.
Background
The multiple pantograph network power supply systems are applied to railway power supply systems in many countries and regions, for example, a south Africa railway traction power supply system adopts two power supply systems of AC25kV/50Hz and DC3 kV.
The European railway traction power supply system is more diversified, the railway traction power supply system of Italy and Belgium is DC3kV, the railway traction power supply system of France and Germany is AC25kV/50Hz, the railway traction power supply system of Switzerland is 15kV/16.7Hz, and the like.
There are 3 standards for railway traction power supply systems in the United states, 12kV/60Hz, 12.5kV/60Hz and 25kV/60Hz, respectively.
The Japanese railway traction power supply system is also divided into 3 types, namely DC1.5kV, 20kV/50Hz and 20kV/60 Hz.
In order to meet international market demands of multiple traction power supply systems across countries or regions, the research on multi-system electric locomotives is also increased in recent years in China.
The existing bow net power supply system identification system has the following defects:
1) the existing detection system adopts an external device to detect an alternating current-direct current power supply system, and then sends a detection result to a traction converter, and because the cost is increased by the need of external equipment support, the practical application requirements can be met only by performing certain system integration, and the problems of signal loss and the like exist;
2) the existing detection system has the problems of long distinguishing time and communication period time, low precision and the like.
Disclosure of Invention
The invention aims to provide a system and a method for quickly identifying an alternating current-direct current power supply system, and solves the problems that an existing bow net power supply system detection device is complex in structure and difficult to quickly and accurately identify.
In order to achieve the purpose, the invention provides a rapid identification system for an alternating current-direct current power supply system, which comprises a network voltage transformer, a voltage sensor and a traction converter:
the network voltage transformer detects and collects network voltage synchronous signals of the pantograph-catenary and outputs the network voltage synchronous signals to the traction converter;
the voltage sensor detects and collects a network voltage synchronous signal of the pantograph-catenary and outputs the network voltage synchronous signal to the traction converter;
and the traction converter respectively calculates corresponding net pressure effective values and net flattening mean values according to net pressure synchronous signals collected by the net pressure mutual inductor and the voltage sensor, and judges the bow net power supply system according to the ratio of the net pressure effective values to the net flattening mean values.
In one embodiment, the grid voltage transformer converts the high voltage of the pantograph to a secondary voltage with a low voltage in proportion, and detects an alternating current grid voltage synchronous signal of the secondary voltage;
the voltage sensor detects and collects direct-current network voltage synchronous signals of a primary side coil ground resistance end of the network voltage transformer.
In an embodiment, the net voltage average value U of the net voltage synchronization signalaveNet voltage value UrmsThe corresponding formula expression is as follows:
Figure GDA0003151460200000021
Figure GDA0003151460200000022
wherein u isiThe sampling value of the network voltage synchronous signal of the ith sampling period is shown, and n is the number of the sampling periods.
In an embodiment, the network voltage synchronization signal is a network voltage synchronization signal uet 1 detected by a network voltage transformer, and the network voltage is a network voltageThe ratio of the net pressure mean value to the net pressure effective value detected by the mutual inductor is lambdanet1The corresponding formula expression is as follows:
Unet1＝u/k；
Figure GDA0003151460200000023
wherein U is the network voltage of the contact network, k is the transformation ratio of the network voltage transformer, and U isave1Average value of net pressure, U, for mutual inductor detectionrms1The effective value of the network voltage detected by the network voltage transformer is obtained.
In an embodiment, the network voltage synchronization signal is a network voltage synchronization signal uet 2 detected by a voltage sensor, and a ratio of a network voltage average value detected by the voltage sensor to a network voltage effective value is λnet2The corresponding formula expression is as follows:
Figure GDA0003151460200000031
Figure GDA0003151460200000032
wherein U is the network voltage of the contact network, R is the grounding resistance of the primary coil of the network voltage transformer, R is the inductance resistance of the primary coil of the network voltage transformer, and Uave2Average value of net pressure, U, detected for voltage sensorrms2The effective value of the network voltage detected by the voltage sensor.
In one embodiment, when U is equal torms1Greater than AC network voltage under-voltage threshold and lambdanet1、λnet2When the current pantograph-catenary power supply system is in the interval (0, a), judging that the current pantograph-catenary power supply system is an alternating current system;
when U is turnedrms2Greater than direct current network voltage under-voltage threshold and lambdanet1In the interval (0, a), lambdanet2When the current pantograph-catenary power supply system is in the interval (b, 1), judging that the current pantograph-catenary power supply system is a direct-current system;
wherein a is a first judgment threshold value, and b is a second judgment threshold value.
In one embodiment, if the current pantograph-catenary power supply system is an alternating-current system, an alternating-current and direct-current selector switch of the traction converter is switched to an alternating-current position, single-phase alternating current is rectified into direct current through a four-quadrant rectifier and is provided for a traction inverter and an auxiliary inverter through an intermediate loop;
if the current pantograph-catenary power supply system is a direct-current system, the alternating-current and direct-current change-over switch of the traction converter is switched to a direct-current position, and direct current is supplied to the traction inverter and the auxiliary inverter through the intermediate loop.
In order to achieve the purpose, the invention provides a method for quickly identifying an alternating current-direct current power supply system, which comprises the following steps:
s1, detecting a network voltage synchronous signal of a bow net of the acquisition network voltage transformer;
s2, detecting and collecting a voltage synchronization signal of the bow net of the voltage sensor;
s3, respectively calculating corresponding net pressure effective value and net flattening mean value according to net pressure synchronous signals collected by the net pressure mutual inductor and the voltage sensor, and judging the bow net power supply system according to the ratio of the net pressure effective value to the net flattening mean value.
In an embodiment, the step S1, further includes converting the high voltage of the pantograph to a secondary voltage of a low voltage in proportion, and detecting an ac voltage synchronization signal of the secondary voltage;
the step S2 further includes detecting a dc network voltage synchronization signal at the end of the ground resistor of the primary coil of the network voltage transformer.
In an embodiment, the net voltage average value U of the net voltage synchronization signalaveNet voltage value UrmsThe corresponding formula expression is as follows:
Figure GDA0003151460200000041
Figure GDA0003151460200000042
wherein，uiThe sampling value of the network voltage synchronous signal of the ith sampling period is shown, and n is the number of the sampling periods.
In an embodiment, the network voltage synchronization signal is a network voltage synchronization signal uet 1 detected by a network voltage transformer, and a ratio of a network voltage mean value detected by the network voltage transformer to a network voltage effective value is λnet1The corresponding formula expression is as follows:
Unet1＝u/k；
Figure GDA0003151460200000043
wherein U is the network voltage of the contact network, k is the transformation ratio of the network voltage transformer, and U isave1Average value of net pressure, U, for mutual inductor detectionrms1The effective value of the network voltage detected by the network voltage transformer is obtained.
In an embodiment, the network voltage synchronization signal is a network voltage synchronization signal uet 2 detected by a voltage sensor, and a ratio of a network voltage average value detected by the voltage sensor to a network voltage effective value is λnet2The corresponding formula expression is as follows:
Figure GDA0003151460200000044
Figure GDA0003151460200000045
wherein U is the network voltage of the contact network, R is the grounding resistance of the primary coil of the network voltage transformer, R is the inductance resistance of the primary coil of the network voltage transformer, and Uave2Average value of net pressure, U, detected for voltage sensorrms2The effective value of the network voltage detected by the voltage sensor.
In one embodiment, when U is equal torms1Greater than AC network voltage under-voltage threshold and lambdanet1、λnet2When the current pantograph-catenary power supply system is in the interval (0, a), judging that the current pantograph-catenary power supply system is an alternating current system;
when U is turnedrms2Greater than direct current network voltage under-voltage threshold and lambdanet1In the interval (0, a), lambdanet2When the current pantograph-catenary power supply system is in the interval (b, 1), judging that the current pantograph-catenary power supply system is a direct-current system;
wherein a is a first judgment threshold value, and b is a second judgment threshold value.
In one embodiment, if the current pantograph-catenary power supply system is an alternating-current system, an alternating-current and direct-current selector switch of the traction converter is switched to an alternating-current position, single-phase alternating current is rectified into direct current through a four-quadrant rectifier and is provided for a traction inverter and an auxiliary inverter through an intermediate loop;
if the current pantograph-catenary power supply system is a direct-current system, the alternating-current and direct-current change-over switch of the traction converter is switched to a direct-current position, and direct current is supplied to the traction inverter and the auxiliary inverter through the intermediate loop.
The invention provides a system and a method for rapidly identifying an alternating current-direct current power supply system, and tests show that the system and the method can enable an electric locomotive to rapidly and accurately identify the alternating current-direct current power supply system in a plurality of periods and automatically complete the switching of the locomotive power supply system according to the identification result, meet the field application requirements and have wide application prospects.
The invention provides a system and a method for rapidly identifying an alternating current-direct current power supply system, which have the following beneficial effects:
1) the system cost is effectively reduced;
2) the alternating current and direct current power supply system can be quickly and accurately identified, and the vehicle intelligence level is improved;
3) the system can be popularized, and has high portability.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
fig. 1 discloses a structure diagram of a rapid identification system of an ac/dc power supply system according to an embodiment of the invention;
fig. 2 discloses a flow chart of a method for rapidly identifying an ac/dc power supply system according to an embodiment of the invention.
The meanings of the reference symbols in the figures are as follows:
100 network voltage transformers;
a 200 voltage sensor;
300 traction converter;
301 an AC/DC switcher;
a 302 four-quadrant rectifier;
303 an intermediate loop;
304 traction inverters;
305 auxiliary inverter;
400 traction transformer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a system and a method for rapidly identifying an alternating current-direct current power supply system, which are widely applied at present and aim at the problem of how to rapidly identify various pantograph-catenary power supply systems of an electric locomotive.
The working principle of the high-voltage traction system of the motor train unit is as follows: the pantograph introduces the voltage of the contact network into a traction transformer to be reduced and then sends the voltage to a traction converter, the traction converter rectifies alternating current into direct current, the direct current is inverted into three-phase alternating current with adjustable voltage and frequency after filtering, and the three-phase alternating current is supplied to a traction motor to realize traction operation.
Fig. 1 is a structural diagram of a rapid identification system for ac/dc power supply systems according to an embodiment of the present invention, and as shown in fig. 1, the rapid identification system for ac/dc power supply systems according to the present invention includes a network voltage transformer 100, a voltage sensor 200, and a traction converter 300.
The system does not depend on additional hardware equipment, calculates the effective value and the average value of the network voltage under the alternating current-direct current system by using the synchronous signal of the alternating current network voltage and the synchronous signal of the direct current network voltage which are collected by a traction current transformer (CI) 300, and quickly identifies the current bow network power supply system by calculating the ratio of the effective value and the average value of the network voltage.
In the embodiment shown in FIG. 1, the various components function as follows:
the network voltage transformer 100 is used for detecting and collecting an alternating current network voltage signal and is used for sampling by the traction converter 300.
The voltage sensor 200 is used for detecting and collecting direct current network voltage signals, and outputting network voltage synchronous signals in real time for sampling by the traction converter 300.
Furthermore, the grid voltage transformer 100 converts the high voltage of the pantograph to the secondary voltage of the low voltage in proportion, and detects the ac grid voltage synchronization signal of the secondary voltage;
the voltage sensor 200 detects a direct-current network voltage synchronous signal at the end of a primary coil ground resistor R of the acquisition network voltage transformer 100.
The input end of the traction converter 300 is connected with the traction transformer 400, the high voltage of the traction transformer 400 is input to the traction converter 300, and after the traction converter 300 judges the current pantograph-catenary power supply system, the working mode of the current traction converter 300 is switched.
If the current ac power system is used, the operating mode of the traction converter 300 is:
the ac/dc switch 301 is switched to an ac potential, and the single-phase ac power is rectified into dc power by a Four-quadrant rectifier 302(4 QS), and is supplied to a Traction Inverter 304 (INV) and an Auxiliary Inverter 305 (APU) through an intermediate circuit 303, and inverted into three-phase ac power with adjustable voltage and frequency, and supplied to a Traction motor to implement Traction operation.
If the current mode is a dc power system, the operating mode of the traction converter 300 is:
the ac/dc changeover switch 301 is switched to a dc level, and the dc is supplied to the traction inverter 304 and the auxiliary inverter 305 through the intermediate circuit 303, inverted into a three-phase ac with adjustable voltage and frequency, and supplied to the traction motor to realize traction operation.
The invention judges the bow net power supply system according to the collected net voltage synchronous signal of the bow net, and firstly explains the system principle of power supply system judgment by taking an alternating current single-phase power supply and a direct current power supply in a theoretical state as an example.
The formula expression corresponding to the alternating-current single-phase power supply of the alternating-current power supply system is as follows:
Figure GDA0003151460200000071
Uacave＝0； (1-2)
Figure GDA0003151460200000072
in the formula: u. ofac-real time voltage of the ac single phase power supply;
Uac-the voltage amplitude of the ac single-phase power supply;
Uacave-average value of the voltage period of the ac single-phase power supply;
Uacrms-an effective value of the voltage of the single-phase alternating current power supply;
ω,
Figure GDA0003151460200000081
-angular frequency, phase of a single phase ac power supply;
t-time.
The formula expression corresponding to the direct-current power supply of the direct-current power supply system is as follows:
udc＝Udc； (2-1)
Udcrms＝Udc； (2-2)
Udcave＝Udc； (2-3)
in the formula: u. ofdc-the real-time voltage of the dc power supply;
Udc-the voltage amplitude of the dc power supply;
Udcave-the average value of the voltage period of the dc power supply;
Udcrms-an effective value of the voltage of the direct current power supply.
And obtaining the average voltage value and the effective voltage value in the alternating current power supply system and the direct current power supply system through formulas (1-2) and (1-3) and formulas (2-2) and (2-3).
Meanwhile, the ratio of the net pressure mean value to the net pressure effective value is calculated, and the corresponding formula expression is as follows:
λac＝Uacave/Uacrms＝0； (3-1)
λdc＝Udcave/Udcrms＝1； (3-2)
in the formula of lambdaacThe ratio of the average value of the network voltage to the effective value of the network voltage in the alternating current power supply system;
λdcand the ratio of the average value of the network voltage to the effective value of the network voltage in the direct-current power supply system.
By analyzing the above theory, as long as the traction converter 300 collects the pantograph voltage signal, the average voltage value, the effective voltage value and the ratio under the ac and dc power supply systems can be quickly calculated.
In the embodiment of the invention, the bow net power supply system is rapidly identified and applied according to the average voltage value, the effective voltage value and the ratio under the alternating current and direct current power supply systems.
The traction converter 300 performs the following processing according to the network voltage synchronization signal detected and collected by the network voltage transformer and the voltage sensor.
Average value U of network voltage synchronous signalaveNet voltage value UrmsThe corresponding formula expression is as follows:
Figure GDA0003151460200000091
Figure GDA0003151460200000092
wherein u isiThe sampling value of the network voltage synchronous signal of the ith sampling period is shown, and n is the number of the sampling periods.
Network voltage synchronous signal Unet1 detected by network voltage transformer, average value of network voltage detected by network voltage transformer and effective value of network voltageRatio of λnet1The mathematical expression of the process is as follows:
Unet1＝u/k； (5-1)
Figure GDA0003151460200000093
in the formula: k is the transformation ratio of the network voltage transformer;
u is the contact net pressure;
Uave1average value of the net pressure detected by the net pressure transformer is obtained by substituting Unet1 into u in formula (4-1)iCalculating to obtain;
Urms1for the effective value of the network voltage detected by the network voltage transformer, the Unet1 is substituted into u in the formula (4-2)iAnd (4) calculating.
U is calculated according to the formulas (4-1) and (4-2)ave1And Urms1Then according to Uave1And Urms1Lambda is calculated from the equation (5-2)net1。
For the network voltage synchronous signal Unet2 detected by the voltage sensor, the ratio of the average value of network voltage detected by the network voltage mutual inductor to the effective value of network voltage is lambdanet2The mathematical expression of the processing procedure is as follows:
Figure GDA0003151460200000094
Figure GDA0003151460200000095
in the formula: r is the grounding resistance of the primary side coil of the network voltage transformer;
r is the inductance internal resistance of the primary side coil of the network voltage transformer;
λnet2the ratio of the net pressure mean value detected by the voltage sensor to the net pressure effective value.
u is the contact net pressure;
Uave2average value of the net pressure detected by the voltage sensor is obtained by the following formula (4-1) bringing Unet2 into uiCalculating to obtain;
Urms2for the net voltage effective value detected by the voltage sensor, by substituting Unet2 into u in equation (4-2)iAnd (4) calculating.
U is calculated according to the formulas (4-1) and (4-2)ave2And Urms2Then according to Uave2And Urms2Lambda was calculated from the formula (6-2)net2。
When U is turnedrms1Greater than AC network voltage under-voltage threshold and lambdanet1、λnet2When the current pantograph-catenary power supply system is in the interval (0, a), judging that the current pantograph-catenary power supply system is an alternating current system;
when U is turnedrms2Greater than direct current network voltage under-voltage threshold and lambdanet1In the interval (0, a), lambdanet2When the current pantograph-catenary power supply system is in the interval (b, 1), judging that the current pantograph-catenary power supply system is a direct-current system;
wherein a is a first judgment threshold value, and b is a second judgment threshold value.
The first judgment threshold value a and the second judgment threshold value b are variable and can be changed according to actual conditions.
In the present embodiment, a is 0.5.
Fig. 2 discloses a flowchart of a method for quickly identifying an ac/dc power supply system according to an embodiment of the present invention, and as shown in fig. 2, the present invention provides a method for quickly identifying an ac/dc power supply system, including the following steps:
s1, detecting a network voltage synchronous signal of a bow net of the acquisition network voltage transformer;
s2, detecting and collecting a voltage synchronization signal of the bow net of the voltage sensor;
s3, respectively calculating corresponding net pressure effective value and net flattening mean value according to net pressure synchronous signals collected by the net pressure mutual inductor and the voltage sensor, and judging the bow net power supply system according to the ratio of the net pressure effective value to the net flattening mean value.
Further, the step S1 further includes converting the high voltage of the pantograph to a secondary voltage of a low voltage in proportion, and detecting an ac mains voltage synchronization signal for acquiring the secondary voltage;
the step S2 further includes detecting a dc network voltage synchronization signal at the end of the ground resistor of the primary coil of the network voltage transformer.
Average value U of network voltage synchronous signalaveNet voltage value UrmsThe corresponding formula expressions are shown as (4-1) and (4-2).
For a network voltage synchronous signal Unet1 detected by the network voltage transformer, the ratio of the average value of network voltage detected by the network voltage transformer to the effective value of network voltage is lambdanet1The corresponding formula expressions are shown as (5-1) and (5-2).
For the network voltage synchronous signal Unet2 detected by the voltage sensor, the ratio of the average value of network voltage detected by the network voltage mutual inductor to the effective value of network voltage is lambdanet2The corresponding formula expressions are shown as (6-1) and (6-2).
When U is turnedrms1Greater than AC network voltage under-voltage threshold and lambdanet1、λnet2When the current pantograph-catenary power supply system is in the interval (0, a), judging that the current pantograph-catenary power supply system is an alternating current system;
when U is turnedrms2Greater than direct current network voltage under-voltage threshold and lambdanet1In the interval (0, a), lambdanet2When the current pantograph-catenary power supply system is in the interval (b, 1), judging that the current pantograph-catenary power supply system is a direct-current system;
wherein a is a first judgment threshold value, and b is a second judgment threshold value.
The first judgment threshold value a and the second judgment threshold value b are variable and can be changed according to actual conditions.
In the present embodiment, a is 0.5.
If the current pantograph-catenary power supply system is an ac system, the operating mode of the traction converter 300 is as follows:
the alternating current-direct current change-over switch of the traction converter is switched to an alternating current position, single-phase alternating current is rectified into direct current through the four-quadrant rectifier and is provided for the traction inverter and the auxiliary inverter through the middle loop;
if the current pantograph-catenary power supply system is a direct-current system, the operating mode of the traction converter 300 is as follows:
the AC/DC changeover switch of the traction converter is switched to a DC level, and the DC is supplied to the traction inverter and the auxiliary inverter through the intermediate loop.
The invention provides a system and a method for rapidly identifying an alternating current-direct current power supply system, and tests show that the system and the method can enable an electric locomotive to rapidly and accurately identify the alternating current-direct current power supply system in a plurality of periods, automatically complete the switching of the locomotive power supply system according to the identification result, meet the field application requirements, and have wide application prospects.
The invention provides a system and a method for rapidly identifying an alternating current-direct current power supply system, which have the following beneficial effects:
1) the system cost is effectively reduced;
2) the alternating current and direct current power supply system can be quickly and accurately identified, and the vehicle intelligence level is improved;
3) the system can be popularized, and has high portability.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.

Claims (12)

1. The utility model provides a quick identification system of alternating current-direct current power supply system which characterized in that, includes net voltage transformer, voltage sensor and traction converter:
the network voltage transformer converts the high voltage of the pantograph net into a secondary voltage of a low voltage in proportion, detects an alternating current network voltage synchronous signal of the secondary voltage and outputs the alternating current network voltage synchronous signal to the traction converter;
the voltage sensor detects a direct-current network voltage synchronous signal of a primary coil ground resistance end of the acquisition network voltage transformer and outputs the direct-current network voltage synchronous signal to the traction converter;
and the traction converter respectively calculates corresponding net pressure effective values and net flattening mean values according to alternating current net pressure synchronous signals collected by the net pressure mutual inductor and direct current net pressure synchronous signals collected by the voltage sensors, and judges the bow net power supply system according to the ratio of the net pressure effective values to the net flattening mean values of the two sensors.
2. The system according to claim 1, wherein the average value of the AC/DC voltage-grid voltage-synchronous signal is UaveNet voltage value UrmsThe corresponding formula expression is as follows:
Figure FDA0003151460190000011
Figure FDA0003151460190000012
wherein u isiThe sampling value of the synchronous signal of the alternating current/direct current network voltage in the ith sampling period is shown, and n is the number of the sampling periods.
3. The system for rapidly identifying an ac/dc power supply system according to claim 2, wherein the ac network voltage synchronization signal detected by the network voltage transformer is Unet1, and the ratio of the average value of the network voltage detected by the network voltage transformer to the effective value of the network voltage is λnet1The corresponding formula expression is as follows:
Unet1＝u/k；
Figure FDA0003151460190000013
wherein u is the contact net pressure;
k is the transformation ratio of the network voltage transformer;
Uave1the average value of the network voltage detected by the network voltage transformer is obtained;
Urms1the effective value of the network voltage detected by the network voltage transformer is obtained.
4. The system according to claim 3, wherein the dc network voltage synchronization signal detected by the voltage sensor is Unet2, and the ratio of the average value of the network voltage detected by the voltage sensor to the effective value of the network voltage is λnet2The corresponding formula expression is as follows:
Figure FDA0003151460190000021
Figure FDA0003151460190000022
wherein u is the contact net pressure;
r is the grounding resistance of a primary side coil of the network voltage transformer;
r is the inductance resistance of the primary coil of the network voltage transformer;
Uave2the average value of the net pressure detected by the voltage sensor;
Urms2the effective value of the network voltage detected by the voltage sensor.
5. The system for rapidly identifying the AC/DC power supply system according to claim 4, wherein:
when U is turnedrms1Is greater thanAC network voltage under-voltage threshold and lambdanet1、λnet2When the current pantograph-catenary power supply system is in the interval (0, a), judging that the current pantograph-catenary power supply system is an alternating current system;
when U is turnedrms2Greater than direct current network voltage under-voltage threshold and lambdanet1In the interval (0, a), lambdanet2When the current pantograph-catenary power supply system is in the interval (b, 1), judging that the current pantograph-catenary power supply system is a direct-current system;
wherein a is a first judgment threshold value, and b is a second judgment threshold value.
6. The system for rapidly identifying an ac/dc power supply system according to claim 1, wherein:
if the current pantograph-catenary power supply system is an alternating-current system, an alternating-current and direct-current selector switch of the traction converter is switched to an alternating-current position, single-phase alternating current is rectified into direct current through a four-quadrant rectifier and is provided for a traction inverter and an auxiliary inverter through an intermediate loop;
if the current pantograph-catenary power supply system is a direct-current system, the alternating-current and direct-current change-over switch of the traction converter is switched to a direct-current position, and direct current is supplied to the traction inverter and the auxiliary inverter through the intermediate loop.
7. A method for rapidly identifying an AC/DC power supply system is characterized by comprising the following steps:
s1, a network voltage transformer, which converts the high voltage of the pantograph-catenary into a secondary voltage of low voltage in proportion and detects the AC network voltage synchronous signal of the secondary voltage;
s2, detecting a direct current network voltage synchronous signal of a primary side coil ground resistance end of the acquisition network voltage transformer by a voltage sensor;
s3, respectively calculating corresponding net pressure effective values and net flattening mean values according to the alternating current net pressure synchronous signals collected by the net pressure mutual inductor and the direct current net pressure synchronous signals collected by the voltage sensors, and judging the bow net power supply system according to the ratio of the net pressure effective values to the net flattening mean values of the two sensors.
8. The AC/DC power supply system quick identification method according to claim 7Method, characterized in that the average value of the voltage of the AC/DC network voltage synchronization signal is UaveNet voltage value UrmsThe corresponding formula expression is as follows:
Figure FDA0003151460190000031
Figure FDA0003151460190000032
wherein u isiThe sampling value of the synchronous signal of the alternating current/direct current network voltage in the ith sampling period is shown, and n is the number of the sampling periods.
9. The method according to claim 8, wherein the ac/dc power supply system is characterized in that the ac network voltage synchronization signal detected by the network voltage transformer is Unet1, and the ratio of the average value of the network voltage detected by the network voltage transformer to the effective value of the network voltage is λnet1The corresponding formula expression is as follows:
Unet1＝u/k；
Figure FDA0003151460190000033
wherein u is the contact net pressure;
k is the transformation ratio of the network voltage transformer;
Uave1the average value of the network voltage detected by the network voltage transformer is obtained;
Urms1the effective value of the network voltage detected by the network voltage transformer is obtained.
10. The method according to claim 9, wherein the dc network voltage synchronization signal detected by the voltage sensor is Unet2, and the ratio of the average value of the network voltage detected by the voltage sensor to the effective value of the network voltage is λnet2The corresponding formula expression is as follows:
Figure FDA0003151460190000041
Figure FDA0003151460190000042
wherein u is the contact net pressure;
r is the grounding resistance of a primary side coil of the network voltage transformer;
r is the inductance resistance of the primary coil of the network voltage transformer;
Uave2the average value of the net pressure detected by the voltage sensor;
Urms2the effective value of the network voltage detected by the voltage sensor.
11. The method for rapidly identifying the ac/dc power supply system according to claim 10, wherein:
when U is turnedrms1Greater than AC network voltage under-voltage threshold and lambdanet1、λnet2When the current pantograph-catenary power supply system is in the interval (0, a), judging that the current pantograph-catenary power supply system is an alternating current system;
when U is turnedrms2Greater than direct current network voltage under-voltage threshold and lambdanet1In the interval (0, a), lambdanet2When the current pantograph-catenary power supply system is in the interval (b, 1), judging that the current pantograph-catenary power supply system is a direct-current system;
wherein a is a first judgment threshold value, and b is a second judgment threshold value.
12. The method for rapidly identifying the AC/DC power supply system according to claim 7, wherein:
if the current pantograph-catenary power supply system is an alternating-current system, an alternating-current and direct-current selector switch of the traction converter is switched to an alternating-current position, single-phase alternating current is rectified into direct current through a four-quadrant rectifier and is provided for a traction inverter and an auxiliary inverter through an intermediate loop;
if the current pantograph-catenary power supply system is a direct-current system, the alternating-current and direct-current change-over switch of the traction converter is switched to a direct-current position, and direct current is supplied to the traction inverter and the auxiliary inverter through the intermediate loop.
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