CN112467688B - Current increment protection method of direct current traction protection measurement and control device - Google Patents
Current increment protection method of direct current traction protection measurement and control device Download PDFInfo
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- CN112467688B CN112467688B CN202011255131.6A CN202011255131A CN112467688B CN 112467688 B CN112467688 B CN 112467688B CN 202011255131 A CN202011255131 A CN 202011255131A CN 112467688 B CN112467688 B CN 112467688B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- 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
- G01R19/12—Measuring rate of change
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a current increment protection method of a direct current traction protection measurement and control device, which comprises the following steps: s1, setting a current change rate setting value di/dt, a current increment setting value delta I and a current increment delay setting value delta I delay And current change rate return delay setting value di/dt duration (ii) a S2, interrupting sampling, collecting current data I in real time and calculating the current change rate; s3, judging whether the current change rate is larger than or equal to the current change rate setting value di/dt; if yes, executing step S4; if not, entering a duration judgment step; s4, writing the current value into the setting value delta I with the length delay The ring buffer of (2); after the ring buffer is full, executing the step S5; s5, calculating whether the difference value of the latest data and the oldest data of the annular buffer area is larger than or equal to a setting value delta I or not; if so, a protection action is triggered. The method can effectively avoid the condition of protecting maloperation when the step waveform appears.
Description
Technical Field
The invention belongs to the technical field of rail transit measurement and control devices, and particularly relates to a protection method of a direct-current traction protection measurement and control device.
Background
Because the train density of operation among the urban rail transit is big, often there is several trains to start simultaneously in a power supply district, and the load current that flows through the feeder circuit breaker this moment is very big, if adopt ordinary overcurrent protection, often can cause the protection maloperation, influences the train normal operating.
The technical problems in the prior art are as follows: existingThe technical protection is provided with a set current change rate setting value di/dt, a current increment setting value delta I and a current increment delay setting value delta I delay And current change rate return delay setting value di/dt duration And (4) setting values. Current increment protection circuitdi/dtWhen the protection enters a starting state, the calculation of time delay is started, and the protection unit can also accurately calculate the change rate of the current by taking the current value of the current increment protection during starting as an initial value. If the current rising rate is always in a state of exceeding a di/dt protection setting value and the current increment protection delay time reaches the setting value, at the moment, if the current change rate (the difference value with the current value of the delta I protection at the starting time) also reaches the setting value, the protection will act to be exported. The current rise rate can fall to a di/dt protection setting value in a short time in the process of calculating the current change rate, but the time period is ensured not to exceed the di/dt duration Setting value range, otherwise protection will return.
The protection method can adapt to various fault current waveforms, solves the problem of large current change rate fluctuation through di/dt return delay, and has a wide protection range. However, the protection method has a problem that the calculated current change rate is not within a fixed time, the running density is continuously increased under the development trend of the current urban rail transit, particularly, the phenomenon occurs when multiple trains are simultaneously and heavily started within a short time in the same power supply interval during the operation peak period, a step waveform occurs at the moment, the current taking of the trains breaks through the current increment protection setting value set by the substation protection device, the protection misoperation can be possibly started, and the normal operation is influenced.
In order to solve the above problems, the current solution is mainly to set the current increment larger than the maximum current value when multiple trains are simultaneously heavily started in a short time in the same power supply interval, but this method may reduce the protection range of the current increment and may cause a failure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a current increment protection method for a direct current traction protection measurement and control device within a fixed time, so as to solve the problem of protection maloperation caused by step waveforms when multiple trains are simultaneously heavily started within a short time in the same power supply interval.
In order to solve the above problems, the technical solution proposed by the present invention is as follows:
a current increment protection method of a direct current traction protection measurement and control device comprises the following steps:
s1, setting a current change rate setting value di/dt, a current increment setting value delta I and a current increment delay setting value delta I delay And current change rate return delay setting value di/dt duration Four setting values;
s2, interrupting sampling, collecting current data I in real time and calculating the current change rate;
s3, judging whether the current change rate is larger than or equal to the current change rate setting value di/dt; if yes, executing step S4; if not, entering a duration judgment step;
s4, writing the current value into a delay setting value delta I with the length of current increment delay The ring buffer of (2); after the ring buffer is full, executing the step S5;
s5, calculating whether the difference value of the latest data and the oldest data of the annular buffer is larger than or equal to a setting value delta I or not; if so, a protection action is triggered.
Further, in the step S2, sampling interruption is 0.1ms interval.
Further, in the step S3, the duration determining step includes the steps of: judging whether the duration of the current change rate greater than or equal to the current change rate setting value di/dt is greater than or equal to the current change rate return delay setting value di/dt duration (ii) a If so, emptying the data in the annular buffer area; if not, step S4 is executed.
Further, in the step S4, if the ring buffer is full, the oldest data is discarded while inserting new data, and then the step S5 is executed again.
The invention has the following beneficial effects: the method reflects the current increment within a fixed time period according with the current change rate, and can effectively avoid the condition of protection misoperation when a step waveform appears. The method expands the protection range of current increment to a certain extent, and can effectively avoid the condition of protection misoperation when a plurality of trains are simultaneously heavily loaded and started in the same power supply interval within a short time while ensuring the protection range.
Drawings
FIG. 1 is a schematic view of a current increment protection determination process according to the present invention;
fig. 2 is a schematic diagram of the current increment protection operation of the present invention.
Detailed Description
The following describes in further detail specific embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a current increment protection method for a dc traction protection measurement and control device, wherein the protection method comprises the following steps:
s1, setting a current change rate setting value di/dt, a current increment setting value delta I and a current increment delay setting value delta I delay And current change rate return delay setting value di/dt duration Four setting values;
s2, interrupting sampling, collecting current data I at intervals of 0.1ms in real time, and calculating the current change rate;
s3, judging whether the current change rate is larger than or equal to a current change rate setting value di/dt; if yes, executing step S4; if not, entering a duration judgment step, and further judging whether the duration of the current change rate greater than or equal to the current change rate setting value di/dt is greater than or equal to the current change rate return delay setting value di/dt duration If so, emptying the data of the annular buffer area; if not, executing the step S4;
s4, writing the current value into a current increment delay setting value delta I delay The ring buffer of (2); after the ring buffer is full, executing the step S5;
s5, calculating whether the difference value of the latest data and the oldest data of the annular buffer is larger than or equal to a setting value delta I or not; if so, a protection action is triggered.
In the step S4, if the ring buffer is full of data, the oldest data is discarded while new data is inserted, and then the step S5 is executed again.
In step S5, there are four protection principles of the protection operation, as shown in fig. 2:
(1) As shown by the curve a, the current change rate exceeds the setting value delta I, but the delay time is less than the setting value delta I delay Protection has no action;
(2) As shown by curve b, the current increment protection delay has reached the setting value delta I delay When the current change rate is larger than or equal to a setting value delta I, protecting the action;
(3) As shown by the curve c, in the current rising process, the current change rate is smaller than the setting value di/dt, but the duration is smaller than the setting value di/dt duration Therefore, the protection is not returned, but the current increment protection is delayed and then in the time interval of T1-T3, the current change rate is smaller than the setting value delta I, so the protection does not act at the time of T3. At the moment, because di/dt is not returned, the data in the annular buffer area is kept refreshing, whether the difference value of the latest data and the oldest data reaches a setting value delta I or not is judged all the time, until the time T4, the difference value is more than or equal to the setting value delta I, and protection action is carried out;
(4) As shown by the curve e, during the current rising process, the current change rate is smaller than the setting value di/dt, and the duration exceeds the setting value di/dt duration Therefore, the data in the ring buffer is emptied, the protection returns, meanwhile, the protection is restarted at the point g, the point g is used as a new starting point, and the protection does not act.
In addition to the four conditions, the method also simulates the current rise process when multiple trains are simultaneously and heavily started in a short time in the same power supply interval, and the result is shown as a curve d, the current rise duration is relatively shorter than that of a curve c, and the current rise duration is at a setting value delta I delay The difference value in time can not reach the setting value delta I, so the protection does not act.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A current increment protection method of a direct current traction protection measurement and control device is characterized by comprising the following steps:
s1, setting a current change rate setting value di/dt, a current increment setting value delta I and a current increment delay setting value delta I delay And current change rate return delay setting value di/dt duration Four setting values;
s2, interrupting sampling, collecting current data I in real time and calculating the current change rate;
s3, judging whether the current change rate is larger than or equal to the current change rate setting value di/dt; if yes, executing step S4; if not, entering a duration judgment step;
in the step S3, the duration determination step includes a step of determining whether or not the duration of the current change rate is equal to or greater than the current change rate return delay setting value di/dt duration (ii) a If so, emptying the data in the annular buffer area; if not, executing the step S4;
s4, writing the current value into a delay setting value delta I with the length of current increment delay The ring buffer of (2); after the ring buffer is full, executing the step S5;
in the step S4, if the data in the ring buffer is full, the oldest data is discarded while new data is inserted automatically, and then the step S5 is executed again;
s5, calculating whether the difference value of the latest data and the oldest data of the annular buffer area is larger than or equal to a setting value delta I or not; if so, a protection action is triggered.
2. The current increment protection method for the direct current traction protection measurement and control device according to claim 1, wherein in the step S2, sampling interruption is 0.1ms interval.
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| CN202011255131.6A CN112467688B (en) | 2020-11-11 | 2020-11-11 | Current increment protection method of direct current traction protection measurement and control device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195275A (en) * | 2011-05-18 | 2011-09-21 | 北京四方继保自动化股份有限公司 | Protecting method of current change rate with self-adaptive output time-delay characteristic |
| CN102842890A (en) * | 2012-09-24 | 2012-12-26 | 国电南瑞科技股份有限公司 | Realizing method of current change rate protection |
| US9667060B1 (en) * | 2014-11-04 | 2017-05-30 | Google Inc. | Adjusting over current protection values during changes in load current |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003032875A (en) * | 2001-07-10 | 2003-01-31 | Mitsubishi Electric Corp | Feeder current relay apparatus |
| JP2005027411A (en) * | 2003-07-01 | 2005-01-27 | Tm T & D Kk | Dc feeding system protection relay |
| CN102185288B (en) * | 2011-05-18 | 2014-08-20 | 北京四方继保自动化股份有限公司 | Current increment protection method capable of reflecting mean current change rate |
| CN110471307A (en) * | 2019-06-27 | 2019-11-19 | 广州白云电器设备股份有限公司 | A kind of current protection simulation system of subway direct-current relay protection device |
| CN111817586B (en) * | 2020-07-07 | 2021-05-04 | 武汉理工大学 | Rectifying power supply device for mine direct-current overhead line and overhead line short circuit detection method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195275A (en) * | 2011-05-18 | 2011-09-21 | 北京四方继保自动化股份有限公司 | Protecting method of current change rate with self-adaptive output time-delay characteristic |
| CN102842890A (en) * | 2012-09-24 | 2012-12-26 | 国电南瑞科技股份有限公司 | Realizing method of current change rate protection |
| US9667060B1 (en) * | 2014-11-04 | 2017-05-30 | Google Inc. | Adjusting over current protection values during changes in load current |
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