CN112701712B - Converter station direct-current voltage measurement abnormity detection method based on converter principle - Google Patents

Converter station direct-current voltage measurement abnormity detection method based on converter principle Download PDF

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CN112701712B
CN112701712B CN202011377898.6A CN202011377898A CN112701712B CN 112701712 B CN112701712 B CN 112701712B CN 202011377898 A CN202011377898 A CN 202011377898A CN 112701712 B CN112701712 B CN 112701712B
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converter
voltage
value
direct
inverter station
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CN112701712A (en
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赖皓
李靖翔
邓健俊
刘羽超
左干清
赵明
洪乐洲
熊双成
雷庆山
肖一鹏
吕圣琦
李宏昌
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Guangzhou Bureau of Extra High Voltage Power Transmission Co
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Guangzhou Bureau of Extra High Voltage Power Transmission Co
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • 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
    • 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]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a method for detecting the abnormal measurement of direct current voltage of a convertor station based on a convertor principle, which relates to a direct current measurement system and comprises the following steps: obtaining the direct-current voltage of the inverter station converter according to the ideal no-load voltage of the inverter station converter transformer side, the arc extinguishing angle of the inverter station converter, the equivalent commutation reactance of the inverter station converter, the direct current and the number of six-pulse inverter bridges in each converter; adjusting the step length of the influence of one gear on the transformation ratio and the gear of the converter transformer tap switch according to the no-load voltage of the converter transformer valve side of the inverter station, the alternating-current bus voltage of the inverter station, the transformation ratio of the inverter station when the converter transformer tap switch is located at the lowest gear and the tap switch to obtain the ideal no-load voltage of the converter transformer valve side of the inverter station; and setting upper and lower limit early warning by taking a calculated value of the DC voltage of the inverter station converter as a center, and judging abnormal fault points and fault conditions of the DC voltage according to the early warning conditions.

Description

Converter station direct-current voltage measurement abnormity detection method based on converter principle
Technical Field
The invention relates to a direct current measurement system, in particular to a converter station direct current voltage measurement abnormity detection method based on a converter principle.
Background
The direct current measurement system is used as an important device of the high-voltage direct current transmission system and plays an important role in safe and stable operation of the direct current system. In recent years, the problem of direct-current voltage measurement abnormality of converter stations governed by a south network power grid occurs for many times, so that abnormal conditions such as direct-current system voltage fluctuation, large abnormality/small abnormality and the like are caused, even control protection misoperation tripping is caused, and the safe and stable operation of a direct-current system is seriously threatened. For the reason of the abnormal occurrence of the direct current voltage measurement, a great amount of research work is carried out in China at present. RTDS simulation research results show that the abnormal reason of the direct-current voltage measurement is the faults of elements such as a high-voltage arm, a low-voltage arm or a secondary voltage dividing plate of a direct-current voltage divider.
At present, the judgment of the abnormal measurement of the direct current voltage is mainly carried out through alternating current/direct current power deviation, a calculated value of a direct current loop resistor, a trigger angle/arc-extinguishing angle and a tap switch gear, and the problems of insufficient intuition, complex detection logic, difficulty in adapting to different direct current running modes and different control protection technical routes and the like exist, and operators need to spend more time for judging specific fault points. Therefore, it is necessary to provide a method for detecting abnormal dc voltage measurement in a converter station based on the converter principle, which predicts the dc voltage according to the operating parameters, and sends an alarm to remind the operator to check and process the dc voltage in time when the actual value of the dc voltage deviates from the predicted value.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for detecting the abnormal measurement of the direct current voltage of the converter station based on the conversion principle, which sets upper and lower limit early warning by taking a calculated value of the direct current voltage of the inverter station as a center and judges the abnormal fault point and the abnormal fault condition of the direct current voltage according to the early warning condition.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for detecting the abnormal measurement of the direct-current voltage of a converter station based on the conversion principle is used for a direct-current transmission system and comprises the following steps:
step 1: obtaining the direct-current voltage of the inverter station converter according to the ideal no-load voltage of the inverter station converter transformer side, the arc extinguishing angle of the inverter station converter, the equivalent commutation reactance of the inverter station converter, the direct current and the number of six-pulse inverter bridges in each converter;
step 2: adjusting the step length of the influence of one gear on the transformation ratio and the gear of the converter transformer tap switch according to the no-load voltage of the converter transformer valve side of the inverter station, the alternating-current bus voltage of the inverter station, the transformation ratio of the inverter station when the converter transformer tap switch is located at the lowest gear and the tap switch to obtain the ideal no-load voltage of the converter transformer valve side of the inverter station;
and step 3: substituting the ideal no-load voltage at the converter transformer valve side of the inverter station into the direct-current voltage of the inverter station converter;
and 4, step 4: constructing a direct-current voltage upper limit calculation value and a direct-current voltage lower limit calculation value according to the direct-current voltage of the inverter station converter;
and 5: and acquiring a direct current voltage measured value, comparing the direct current voltage measured value with a direct current voltage upper limit calculated value and a direct current voltage lower limit calculated value respectively, and monitoring the direct current power transmission system.
The method for detecting the abnormal measurement of the direct-current voltage of the converter station based on the conversion principle further comprises the following steps of 1:
DC voltage U of inverter station converterd2：
Figure BDA0002807637800000021
Wherein, Ud2The voltage is the direct current voltage of a converter of the inversion station, kV; u shaped02Ideal no-load voltage, kV, at the converter transformer valve side of the inverter station; gamma rayThe angle is the arc extinguishing angle of the inverter station converter; x is the number ofr2The equivalent commutation reactance is omega of the inverter station converter; i isdIs direct current, A; n is a radical of2The number of the six-pulse inversion bridges in each converter is.
The method for detecting the abnormal measurement of the direct-current voltage of the converter station based on the conversion principle further comprises the following steps in step 2:
ideal no-load voltage U at converter side of inverter stationd02：
Ud02＝1.35U2＝1.35Uac2(K+dn2) (2)
U2The no-load voltage at the converter transformer valve side of the inverter station is kV; u shapeac2The voltage of an alternating current bus of the inversion station is kV; k is the transformation ratio of the inverter station converter transformer tapping switch at the lowest gear,%; d is the step length,%, of the tap changer for adjusting the influence of one gear on the transformation ratio; n is2The switch gear is tapped for the converter transformer (not converted).
The method for detecting the abnormal measurement of the direct-current voltage of the converter station based on the conversion principle further comprises the following steps in step 3:
by substituting formula (2) into formula (1)
Figure BDA0002807637800000022
Can be expressed as
Ud2＝AX+BY+CZ+D (4)
Wherein A, B, C, D is the coefficient of the multiple linear equation, X, Y, Z is the variable of the multiple linear equation. A is 1.35N2K，B＝1.35N2d，
Figure BDA0002807637800000023
X＝Uac2cosγ，Y＝Uac2n2 cosγ，Z＝Id(ii) a D is a compensation constant considering actual measurement errors, and the theoretical value is 0.
From the formula (4), X, Y, Z and Ud2In a linear relationship, a multiple linear regression method can be adopted to measure from the sample data setA, B, C, D are calculated.
The method for detecting the abnormal measurement of the direct-current voltage of the converter station based on the conversion principle further comprises the following steps of (4):
make the upper limit of DC voltage calculate a value Ud2_TOP＝Ud2' + K, lower limit calculation value U of DC voltaged2_BUTTON＝Ud2'-K；
In the step 5:
when the DC voltage measurement value U of the inverter station converterd2Greater than the upper limit calculated value Ud2_TOPSending a 'direct current voltage measured value is greater than a calculated value alarm' for detecting the fault of abnormal high direct current voltage;
when the DC voltage measurement value U of the inverter station converterd2Less than the lower limit calculated value Ud2_BUTTONAnd sending a 'direct current voltage measured value is lower than a calculated value to alarm' for the fault of abnormal low direct current voltage, wherein K takes a value of 2-4 kV.
The method for detecting the abnormal direct-current voltage measurement of the converter station based on the conversion principle further monitors a direct-current power transmission system, and comprises the steps of adapting to different direct-current operation modes and different control protection technical routes, wherein for the ultrahigh-voltage technical route converter station, under the normal condition, Ud2 is Udl-Udn, and Udl is the direct-current voltage of a high-voltage bus, kV; udn is the neutral bus DC voltage, kV. When the measured value of Ud2 is larger than the upper limit calculated value, judging that the abnormality of Udl-Udn is larger; when the measured value of Ud2 is smaller than the lower limit calculation value, it is judged that "Udl-Udn abnormality is small".
The method for detecting the abnormal direct-current voltage measurement of the converter station based on the converter principle further monitors a direct-current power transmission system, and comprises the steps of adapting to different direct-current operation modes and different control protection technical lines, wherein two converters are arranged in the converter station of the extra-high voltage technical line; when the high-side converter voltage is Ud2_1 and the high-side converter voltage is Ud2_2, Ud2_1 is Udl-Udm, and Ud2_2 is Udm-Udn; udl is the DC voltage of the high-voltage bus, kV; udm is converter tie line voltage, kV; udn is the neutral bus direct current voltage, kV;
for the Siemens extra-high voltage technical route, Udl-Udm and Udm-Udn are respectively used as voltage control quantities of a high-end converter and a low-end converter. When the Ud2_1 measured value is larger than the upper limit calculated value and the Ud2_2 is normal, it is judged that 'Udl is abnormal and large'; when the Ud2_1 measured value is smaller than the lower limit calculation value and the Ud2_2 is normal, judging that the' Udl abnormality is smaller; when the Ud2_1 measurement value is smaller than the lower limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, it is judged that the 'Udm abnormality is larger'; when the Ud2_1 measurement value is larger than the upper limit calculation value and the Ud2_2 measurement value is smaller than the lower limit calculation value, it is judged that the 'Udm abnormality is smaller'; when the Ud2_2 measured value is smaller than the lower limit calculated value and the Ud2_1 is normal, judging that the Udn is larger in abnormality; when the Ud2_2 measured value is larger than the upper limit calculated value and the Ud2_1 is normal, judging that the Udn is abnormal to be smaller;
for the south Rui extra-high voltage technical route, Udl-Udn are used as voltage control quantities of the high-side converter and the low-side converter. When the Ud2_1 measurement value is larger than the upper limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, judging that the 'Udl-Udn abnormality is larger'; when the Ud2_1 measured value is smaller than the lower limit calculation value and the Ud2_2 measured value is smaller than the lower limit calculation value, judging that the abnormality of 'Udl-Udn is smaller'; when the Ud2_1 measurement value is smaller than the lower limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, it is judged that the 'Udm abnormality is larger'; when the Ud2_1 measurement value is greater than the upper limit calculation value and the Ud2_2 measurement value is less than the lower limit calculation value, "Udm is judged to be abnormally small".
Compared with the prior art, the invention has the beneficial effects that: the invention provides a converter station direct-current voltage measurement abnormity detection method based on a current conversion principle, which is suitable for detecting the direct-current voltage abnormity of all types of current converter stations in China at present, can visually judge whether the direct-current voltage measurement is abnormal or not by comparing a direct-current voltage measurement value with a predicted value, solves the problems that the detection means of the direct-current voltage measurement abnormity in China is not visual enough, the detection logic is complex, the direct-current voltage measurement abnormity detection method is difficult to adapt to different direct-current operation modes and different control protection technical routes and the like, can be used in the fields of control protection logic, telemechanical data analysis, fault recording detection and the like, finds out the abnormal fault of the direct-current voltage measurement in time, positions specific fault points and fault conditions, can effectively realize the safe and stable operation of a direct-current transmission system, and has high economic benefit and popularization and application value.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a comparison of a measured value and a calculated value of a DC voltage of a converter of an inverter station;
FIG. 2 is a logic diagram of DC voltage anomaly detection for the extra-high voltage technical line;
FIG. 3 is a direct current voltage anomaly detection logic for Siemens ultra-high voltage technology line;
fig. 4 is a logic of detecting abnormality of dc voltage in the south rui extra-high voltage technical line.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example (b):
it should be noted that the terms "comprises" and "comprising," and any variations thereof, of embodiments of the present invention are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1 to 4, fig. 1 is a comparison between a measured value and a calculated value of a dc voltage of a converter of an inverter station; FIG. 2 is a logic diagram of DC voltage anomaly detection for the extra-high voltage technical line; FIG. 3 is a direct current voltage anomaly detection logic for Siemens ultra-high voltage technology line; fig. 4 is a logic of detecting abnormality of dc voltage in the south rui extra-high voltage technical line.
The invention deduces a direct-current voltage calculation formula of the converter to invert the direct-current voltage U of the converter of the stationd2AC bus voltage Uac2Converter extinction angle gamma and gear n of converter transformer tap changer2D.c. current Id2Calculating the parameters of the formula by using a multiple linear regression method for sample data, thereby realizing the purpose of passing through the AC bus voltage Uac2Converter extinction angle gamma and gear n of converter transformer tap changer2D.c. current Id2DC voltage calculation value U of inverter station converter is calculated to measured valued2And upper and lower limit early warning of +/-K values is set by taking the calculated value as the center, and abnormal fault points and fault conditions of the direct current voltage are judged according to the early warning conditions.
The method comprises the following specific steps:
for DC transmission system, the DC voltage U of inverter station converterd2The following formula can be used for calculation:
Figure BDA0002807637800000051
wherein, Ud2The voltage is the direct current voltage of a converter of the inversion station, kV; u shaped02Ideal no-load voltage, kV, at the converter transformer valve side of the inverter station; gamma is the arc-extinguishing angle of the inverter station converter; x is the number ofr2The equivalent commutation reactance is omega of the inverter station converter; i isdIs direct current, A; n is a radical of2The number of the six-pulse inversion bridges in each converter is.
Ideal no-load voltage U at converter side of inverter stationd02The following formula can be used for calculation:
Ud02＝1.35U2＝1.35Uac2(K+dn2) (2)
U2the no-load voltage at the converter transformer valve side of the inverter station is kV; u shapeac2The voltage of an alternating current bus of the inversion station is kV; k is the transformation ratio of the inverter station converter transformer tapping switch at the lowest gear,%; d is the step length,%, of the tap changer for adjusting the influence of one gear on the transformation ratio;n2the switch gear is tapped for the converter transformer (not converted).
By substituting formula (2) into formula (1)
Figure BDA0002807637800000052
Can be expressed as
Ud2＝AX+BY+CZ+D (4)
Wherein A, B, C, D is the coefficient of the multiple linear equation, X, Y, Z is the variable of the multiple linear equation. A is 1.35N2K，B＝1.35N2d，
Figure BDA0002807637800000053
X＝Uac2cosγ，Y＝Uac2n2 cosγ，Z＝Id(ii) a D is a compensation constant considering actual measurement errors, and the theoretical value is 0.
From the formula (4), X, Y, Z and Ud2In a linear relationship, a multiple linear regression method may be employed to calculate A, B, C, D from the sample data set.
Input sample set M ═ Ud2’，Uac2’，γ’，n’，Id' }, converting the calculation sample set into a calculation sample set N ═ U according to X, Y, Z calculation formulad2X, Y, Z }. The constant A, B, C, D of equation (4) was calculated using a multiple linear regression method.
Input actual measurement set R ═ Uac2，γ，n，IdAnd (4) calculating a direct-current voltage calculation value U of the inverter station converterd2'. For a certain ± 800kV converter station, a is calculated to be-0.017, B is calculated to be 0.001, C is calculated to be-0.005, and D is calculated to be 400.065. As shown in fig. 1, the measured value U of the DC voltage of the inverter station converterd2And the calculated value Ud2' comparison.
Make the upper limit of DC voltage calculate a value Ud2_TOP＝Ud2' + K, lower limit calculation value U of DC voltaged2_BUTTON＝Ud2' -K. When the DC voltage measurement value U of the inverter station converterd2Greater than the upper limit calculated value Ud2_TOPEmitting a "DC voltage measurement value greater thanA calculated value alarm for detecting the fault of abnormal high DC voltage; when the DC voltage measurement value U of the inverter station converterd2Less than the lower limit calculated value Ud2_BUTTONAnd sending out a 'direct current voltage measured value is lower than a calculated value for warning' for the fault that the direct current voltage is abnormally lower. K can be 2-4 kV.
For DC transmission systems, the converter DC voltage U of the rectifier stationd1The following formula can be used for calculation:
Figure BDA0002807637800000061
wherein, Ud1Is the direct current voltage of a converter of the rectifying station, kV; u shaped01Ideal no-load voltage, kV, at the converter transformer valve side of the rectifier station; is the arc-extinguishing angle, degree, of the converter of the alpha rectifying station; x is the number ofr1Is the equivalent commutation reactance, omega, of the converter of the rectifier station; i isdIs direct current, A; n is a radical of1The number of the six-pulse rectifier bridges in each converter is.
The formula form is the same as that of the inverter station, only the extinction angle gamma needs to be replaced by the trigger angle alpha, and all calculation methods and detection logics of the invention are suitable for the rectifier station.
Further, in order to adapt to different direct current operation modes and different control protection technical routes, the following direct current voltage measurement abnormity detection logic is arranged.
For the ultra-high voltage technical line converter station, only one converter is provided, under the normal condition, Ud2 is Udl-Udn, and Udl is the direct-current voltage of a high-voltage bus, kV; udn is the neutral bus DC voltage, kV. When the measured value of Ud2 is larger than the upper limit calculated value, judging that the abnormality of Udl-Udn is larger; when the measured value of Ud2 is smaller than the lower limit calculation value, it is judged that "Udl-Udn abnormality is small".
For the extra-high voltage technical line converter station, two converters are provided. Let the high-side converter voltage be Ud2_1 and the high-side converter voltage be Ud2_2, then Ud2_1 is Udl-Udm and Ud2_2 is Udm-Udn. Udl is the DC voltage of the high-voltage bus, kV; udm is converter tie line voltage, kV; udn is the neutral bus DC voltage, kV.
For the Siemens extra-high voltage technical route, Udl-Udm and Udm-Udn are respectively used as voltage control quantities of a high-end converter and a low-end converter. When the Ud2_1 measured value is larger than the upper limit calculated value and the Ud2_2 is normal, it is judged that 'Udl is abnormal and large'; when the Ud2_1 measured value is smaller than the lower limit calculation value and the Ud2_2 is normal, judging that the' Udl abnormality is smaller; when the Ud2_1 measurement value is smaller than the lower limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, it is judged that the 'Udm abnormality is larger'; when the Ud2_1 measurement value is larger than the upper limit calculation value and the Ud2_2 measurement value is smaller than the lower limit calculation value, it is judged that the 'Udm abnormality is smaller'; when the Ud2_2 measured value is smaller than the lower limit calculated value and the Ud2_1 is normal, judging that the Udn is larger in abnormality; when the measured value of Ud2_2 is larger than the upper limit calculated value and Ud2_1 is normal, the judgment that the abnormality of Udn is smaller is made.
For the south Rui extra-high voltage technical route, Udl-Udn are used as voltage control quantities of the high-side converter and the low-side converter. When the Ud2_1 measurement value is larger than the upper limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, judging that the 'Udl-Udn abnormality is larger'; when the Ud2_1 measured value is smaller than the lower limit calculation value and the Ud2_2 measured value is smaller than the lower limit calculation value, judging that the abnormality of 'Udl-Udn is smaller'; when the Ud2_1 measurement value is smaller than the lower limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, it is judged that the 'Udm abnormality is larger'; when the Ud2_1 measurement value is greater than the upper limit calculation value and the Ud2_2 measurement value is less than the lower limit calculation value, "Udm is judged to be abnormally small".
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (4)

1. A method for detecting the abnormal measurement of the direct-current voltage of a converter station based on the conversion principle is used for a direct-current transmission system, and is characterized by comprising the following steps:
step 1: obtaining the direct-current voltage of the inverter station converter according to the ideal no-load voltage of the inverter station converter transformer side, the arc extinguishing angle of the inverter station converter, the equivalent commutation reactance of the inverter station converter, the direct current and the number of six-pulse inverter bridges in each converter;
step 2: adjusting the step length of the influence of one gear on the transformation ratio and the gear of the converter transformer tap switch according to the no-load voltage of the converter transformer valve side of the inverter station, the alternating-current bus voltage of the inverter station, the transformation ratio of the inverter station when the converter transformer tap switch is located at the lowest gear and the tap switch to obtain the ideal no-load voltage of the converter transformer valve side of the inverter station;
and step 3: substituting the ideal no-load voltage at the converter transformer valve side of the inverter station into the direct-current voltage of the inverter station converter;
and 4, step 4: constructing a direct-current voltage upper limit calculation value and a direct-current voltage lower limit calculation value according to the direct-current voltage of the inverter station converter;
and 5: acquiring a direct current voltage measured value, comparing the direct current voltage measured value with a direct current voltage upper limit calculated value and a direct current voltage lower limit calculated value respectively, and monitoring a direct current power transmission system;
in the step 1:
DC voltage U of inverter station converterd2：
Figure FDA0003231347730000011
Wherein, Ud2The voltage is the direct current voltage of a converter of the inversion station, kV; u shaped02Ideal no-load voltage, kV, at the converter transformer valve side of the inverter station; gamma is the arc-extinguishing angle of the inverter station converter; x is the number ofr2The equivalent commutation reactance is omega of the inverter station converter; i isdIs direct current, A; n is a radical of2The number of the six-pulse inversion bridges in each converter is counted;
in the step 2:
ideal no-load voltage U at converter side of inverter stationd02：
Ud02＝1.35U2＝1.35Uac2(K+dn2) (2)
U2The no-load voltage at the converter transformer valve side of the inverter station is kV; u shapeac2The voltage of an alternating current bus of the inversion station is kV; k is the converter transformer of the inverter stationThe transformation ratio of the switch at the lowest gear is connected,%; d is the step length,%, of the tap changer for adjusting the influence of one gear on the transformation ratio; n is2The converter transformer is connected with a switch gear;
in the step 3:
by substituting formula (2) into formula (1)
Figure FDA0003231347730000012
Is shown as
Ud2＝AX+BY+CZ+D (4)
Wherein A, B, C, D is the coefficient of the multiple linear equation, X, Y, Z is the variable of the multiple linear equation; a is 1.35N2K，B＝1.35N2d，
Figure FDA0003231347730000021
X＝Uac2cosγ，Y＝Uac2n2cosγ，Z＝Id(ii) a D is a compensation constant considering actual measurement errors, and the theoretical value is 0;
from the formula (4), X, Y, Z and Ud2In a linear relationship, a multiple linear regression method is used to calculate A, B, C, D from the sample data set.
2. The method for detecting the abnormal measurement of the direct-current voltage of the converter station based on the conversion principle according to the claim 1, characterized in that in the step 4:
make the upper limit of DC voltage calculate a value Ud2_TOP＝Ud2' + K, lower limit calculation value U of DC voltaged2_BUTTON＝Ud2'-K；
In the step 5:
when the DC voltage measurement value U of the inverter station converterd2Greater than the upper limit calculated value Ud2_TOPSending a 'direct current voltage measured value is greater than a calculated value alarm' for detecting the fault of abnormal high direct current voltage;
when the DC voltage measurement value U of the inverter station converterd2Less than the lower limit calculated value Ud2_BUTTONAnd sending a 'direct current voltage measured value is lower than a calculated value to alarm' for the fault of abnormal low direct current voltage, wherein K takes a value of 2-4 kV.
3. The method for detecting the abnormal direct-current voltage measurement of the converter station based on the commutation principle according to claim 1, wherein the monitoring of the direct-current power transmission system comprises adapting to different direct-current operation modes and different control protection technical routes, wherein for the ultra-high voltage technical route converter station, under the normal condition, Ud2 is Udl-Udn, Udl is the direct-current voltage of the high-voltage bus, kV; udn is the neutral bus direct current voltage, kV; when the measured value of Ud2 is larger than the upper limit calculated value, judging that the abnormality of Udl-Udn is larger; when the measured value of Ud2 is smaller than the lower limit calculation value, it is judged that "Udl-Udn abnormality is small".
4. The method for detecting the abnormal direct current voltage measurement of the converter station based on the conversion principle of claim 1 is characterized in that a direct current power transmission system is monitored, and the method comprises the steps of adapting to different direct current operation modes and different control protection technical lines, wherein for the converter station of the extra-high voltage technical line, two converters are arranged; when the high-side converter voltage is Ud2_1 and the high-side converter voltage is Ud2_2, Ud2_1 is Udl-Udm, and Ud2_2 is Udm-Udn; udl is the DC voltage of the high-voltage bus, kV; udm is converter tie line voltage, kV; udn is the neutral bus direct current voltage, kV;
for the Siemens extra-high voltage technical route, Udl-Udm and Udm-Udn are respectively used as voltage control quantities of a high-end converter and a low-end converter; when the Ud2_1 measured value is larger than the upper limit calculated value and the Ud2_2 is normal, it is judged that 'Udl is abnormal and large'; when the Ud2_1 measured value is smaller than the lower limit calculation value and the Ud2_2 is normal, judging that the' Udl abnormality is smaller; when the Ud2_1 measurement value is smaller than the lower limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, it is judged that the 'Udm abnormality is larger'; when the Ud2_1 measurement value is larger than the upper limit calculation value and the Ud2_2 measurement value is smaller than the lower limit calculation value, it is judged that the 'Udm abnormality is smaller'; when the Ud2_2 measured value is smaller than the lower limit calculated value and the Ud2_1 is normal, judging that the Udn is larger in abnormality; when the Ud2_2 measured value is larger than the upper limit calculated value and the Ud2_1 is normal, judging that the Udn is abnormal to be smaller;
for the south Rui extra-high voltage technical route, Udl-Udn are used as voltage control quantities of a high-end converter and a low-end converter; when the Ud2_1 measurement value is larger than the upper limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, judging that the 'Udl-Udn abnormality is larger'; when the Ud2_1 measured value is smaller than the lower limit calculation value and the Ud2_2 measured value is smaller than the lower limit calculation value, judging that the abnormality of 'Udl-Udn is smaller'; when the Ud2_1 measurement value is smaller than the lower limit calculation value and the Ud2_2 measurement value is larger than the upper limit calculation value, it is judged that the 'Udm abnormality is larger'; when the Ud2_1 measurement value is greater than the upper limit calculation value and the Ud2_2 measurement value is less than the lower limit calculation value, "Udm is judged to be abnormally small".
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