WO2021063208A1 - Procédé de détermination de mesure anormale d'une tension côté redresseur de courant continu à tension ultra-élevée - Google Patents

Procédé de détermination de mesure anormale d'une tension côté redresseur de courant continu à tension ultra-élevée Download PDF

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WO2021063208A1
WO2021063208A1 PCT/CN2020/116680 CN2020116680W WO2021063208A1 WO 2021063208 A1 WO2021063208 A1 WO 2021063208A1 CN 2020116680 W CN2020116680 W CN 2020116680W WO 2021063208 A1 WO2021063208 A1 WO 2021063208A1
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Prior art keywords
low
gear position
voltage
udm
measurement
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PCT/CN2020/116680
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English (en)
Chinese (zh)
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武霁阳
彭光强
何竞松
李清
王越杨
李章允
国建宝
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中国南方电网有限责任公司超高压输电公司检修试验中心
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Publication of WO2021063208A1 publication Critical patent/WO2021063208A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead

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  • the invention relates to detection of abnormality in DC transmission voltage measurement, and in particular to a method for judging abnormality in measurement of UHV DC rectifier side voltage.
  • the DC transmission measurement equipment is the core equipment to ensure the safe and stable operation of the DC, and the DC control protection program also works on the basis of the electrical quantity measurement results. If the measurement result of the DC measurement equipment is abnormal, it will inevitably lead to changes in the DC operating state, which may seriously cause protection tripping and even damage to primary equipment such as thyristors, which will cause huge economic and social impacts.
  • both DC voltage and DC current may have measurement abnormalities, but DC voltage is generally measured by the principle of voltage division, and DC current is generally measured by the principle of shunting.
  • the measurement principle of DC voltage is more than that of DC current. It is susceptible to the influence of changes in the parameters of the electrical components in the measurement loop. In actual engineering, it has also occurred many times that the voltage measurement is abnormal due to the abnormal varistor in the resistance box. From the perspective of the consequences of the abnormal measurement, the abnormal measurement of the DC current will cause the trigger angle output of the current controller to change, causing the DC to enter the overload operation state.
  • the DC voltage is measured abnormally, on the one hand, it may cause overvoltage in the DC system, which may cause risks to the operation of the equipment.
  • the limitations of on-site operation and maintenance work also increase the difficulty of measuring abnormalities.
  • the operation and maintenance personnel of the rectifier station mainly pay attention to the changes in the electrical quantity of the rectifier station, while the operation and maintenance personnel of the inverter station mainly pay attention to the changes of the electrical quantity of the inverter station. Determine whether there is a measurement abnormality on this site.
  • the present invention proposes a method for judging abnormal voltage measurement on the UHV DC rectifier side, which compares the difference in the firing angle between the high and low end valve groups on the rectifier side and The difference in trigger angle and valve group voltage between different poles realizes the identification of measurement abnormalities on the rectifier side and the positioning of abnormal measurement points.
  • a method for judging abnormalities in UHV DC rectifier side voltage measurement including the following steps:
  • Step 1 detecting the rectifier firing angle ⁇ * high-valve upper and lower ends valve firing angle ⁇ * low end and high end of the pole angle ⁇ * trigger valve op high and low low-side valve firing angle ⁇ * op ;
  • Step 2 Detect the high-voltage bus voltage UdH of the rectifier station, the midpoint voltage UdM of the high and low valve group, the low voltage bus voltage UdN, and the opposite high voltage bus voltage UdH op , the midpoint voltage of the high and low valve group UdM op , and the low voltage bus voltage UdN op ;
  • Step 3 Correct ⁇ * high end , ⁇ * low end , ⁇ * high end op , ⁇ * low end op to the standard shifting gear position to obtain the corrected firing angle ⁇ high end , ⁇ low end , and ⁇ high end op .
  • ⁇ low-end op
  • Step 4 Determine whether ⁇ high end > ⁇ low end + 1.5° is satisfied
  • step 6 If satisfied, go to step 6;
  • step 5 If not satisfied, go to step 5;
  • Step 5 Determine whether ⁇ low end > ⁇ high end + 1.5° is satisfied;
  • step 7 If satisfied, go to step 7;
  • step 10 If not satisfied, go to step 10;
  • Step 6 Preliminary judgment is that the UdH measurement on the rectifier side is too high or the UdM measurement on the rectifier side is too low, go to step 8;
  • Step 7 Preliminary judgement is that the UdH measurement on the rectifier side is low or the UdM measurement on the rectifier side is too high, go to step 8;
  • Step 8. Determine relationship 1 and relationship 2:
  • Relationship 1 ⁇ high-end > ⁇ high-end op +1.5°and
  • step 9 After the judgment is completed, go to step 9;
  • Step 9 Determine the satisfaction of relationship 1 and relationship 2:
  • step 12 If both relationship 1 and relationship 2 are satisfied, then go to step 12;
  • Step 10 There is no measurement abnormality, and the measurement abnormality judgment process ends;
  • Step 11 The UdH measurement on the rectifier side is abnormal, and the measurement abnormality judgment process ends;
  • Step 12 The UdM measurement on the rectifier side is abnormal, and the measurement abnormality judgment process ends.
  • step 3 the standard commutation gear position is rounded off the average value of all gear positions on the rectifier side, and only integers are retained.
  • step 3 the calculation method of ⁇ high end is as follows:
  • step 3 the calculation method of ⁇ * low-end op is as follows:
  • the beneficial effect of the present invention is that by comparing the trigger angle difference between the high and low end valve groups on the rectifier side and the trigger angle and valve group voltage differences between different poles, the method can realize the recognition of measurement abnormalities on the rectifier side and the detection of abnormal measurement points. Positioning.
  • the method is simple in principle, easy to implement, and only uses the rectifier side data, does not rely on the rectifier station and the inverter station for data communication, and has strong engineering practical value.
  • Figure 1 is a schematic diagram of DC voltage measurement points on the rectifier side pole 1 of a converter station
  • Fig. 2 is a flowchart of the method for judging abnormal voltage measurement on the UHV DC rectifier side of the present invention
  • Figure 3 is a screenshot of the DC field status of the rectifier station when the 1UdH of the DC rectifier side pole of Puqiao is higher than 1.02 times;
  • Figure 4 is a screenshot of the operation status of the converter transformer of the rectifier station when the 1UdH of the DC rectifier side pole of Puqiao is higher than 1.02 times.
  • Fig. 1 is a schematic diagram of the DC voltage measurement points of the rectifier side pole 1 of a converter station.
  • the principle adopted in the present invention is:
  • the rectifier side control system detects the difference in the valve group voltage between the high and low valve groups.
  • the rectifier side is generally under constant current control, it will start the voltage balance control by adjusting the current controller error of the high and low valve groups. Value output, in order to achieve the purpose of equalizing the voltage of the high and low end valve groups. In this operating state, there will inevitably be a difference in the firing angle between the high and low end valve groups.
  • U d1 is the valve voltage
  • E is the effective value of the power supply voltage
  • ⁇ is the valve trigger angle
  • ⁇ is the commutation angle.
  • the present invention provides a method for judging abnormalities in UHV DC rectifier side voltage measurement, which includes the following steps:
  • Step 1 detecting the rectifier firing angle ⁇ * high-valve upper and lower ends valve firing angle ⁇ * low end and high end of the pole angle ⁇ * trigger valve op high and low low-side valve firing angle ⁇ * op ;
  • Step 2 Detect the high-voltage bus voltage UdH of the rectifier station, the midpoint voltage UdM of the high and low valve group, the low voltage bus voltage UdN, and the opposite high voltage bus voltage UdH op , the midpoint voltage of the high and low valve group UdM op , and the low voltage bus voltage UdN op ;
  • Step 3 Correct ⁇ * high end , ⁇ * low end , ⁇ * high end op , ⁇ * low end op to the standard shifting gear position to obtain the corrected firing angle ⁇ high end , ⁇ low end , and ⁇ high end op .
  • ⁇ low-end op
  • the standard shift gears are rounded off the average of all gears on the rectifier side, and only integers are reserved;
  • Step 4 Determine whether ⁇ high end > ⁇ low end + 1.5° is satisfied
  • step 6 If satisfied, go to step 6;
  • step 5 If not satisfied, go to step 5;
  • Step 5 Determine whether ⁇ low end > ⁇ high end + 1.5° is satisfied;
  • step 7 If satisfied, go to step 7;
  • step 10 If not satisfied, go to step 10;
  • Step 6 Preliminary judgment is that the UdH measurement on the rectifier side is too high or the UdM measurement on the rectifier side is too low, go to step 8;
  • Step 7 Preliminary judgement is that the UdH measurement on the rectifier side is low or the UdM measurement on the rectifier side is too high, go to step 8;
  • Step 8. Determine relationship 1 and relationship 2:
  • step 9 After the judgment is completed, go to step 9;
  • Step 9 Determine the satisfaction of relationship 1 and relationship 2:
  • step 12 If both relationship 1 and relationship 2 are satisfied, then go to step 12;
  • Step 10 There is no measurement abnormality, and the measurement abnormality judgment process ends;
  • Step 11 The UdH measurement on the rectifier side is abnormal, and the measurement abnormality judgment process ends;
  • Step 12 The UdM measurement on the rectifier side is abnormal, and the measurement abnormality judgment process ends.
  • the proposed method is verified based on the Puqiao DC RTDS electromagnetic transient simulation platform, which is equipped with station control, pole control, group control, pole protection, and valve group protection devices consistent with the actual project. , And the control protection program is consistent with the actual project.
  • Step 3 the rectifier side pole 1 high-end valve group commutates to 9 gears, the pole 1 low-end valve group and the pole 2 valve group commutators are both 8 gears, and the standard shift gears are calculated.
  • Step 4 ⁇ high end > ⁇ low end + 1.5°, go to step 6;
  • Step 6 Preliminary judgement is that the 1UdH measurement of the rectifier side pole is too high or the 1UdM measurement of the rectifier side pole is too low, go to step 8;
  • Step 8. Determine relationship 1 and relationship 2:
  • Relationship 1 ⁇ high-end > ⁇ high-end op +1.5°and
  • Step 9 If relationship 1 and relationship 2 are not satisfied, go to step 11.
  • Step 11 The 1UdH measurement of the rectifier side pole is abnormally high, and the measurement abnormality judgment process ends.
  • the method for judging abnormalities in UHV DC rectifier side voltage measurement of the present invention can accurately identify measurement abnormalities and abnormal measurement points using only the rectifier side data.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rectifiers (AREA)

Abstract

L'invention concerne un procédé de détermination d'une mesure anormale d'une tension côté redresseur de courant continu à tension ultra-élevée, consistant : à détecter un angle de déclenchement d'ensemble de vannes d'extrémité supérieure α* high end et un angle de déclenchement d'ensemble de vannes d'extrémité inférieure α* low end d'un poste de redressement, ainsi qu'un angle de déclenchement d'ensemble de vannes d'extrémité supérieure α* high end op et un angle de déclenchement d'ensemble de vannes d'extrémité inférieure α* low end op d'un pôle opposé ; à détecter une tension de bus haute tension UdH, une tension de point médian d'ensemble de vannes supérieures/inférieures et une tension de bus basse tension UdN du poste de redressement, ainsi qu'une tension de bus haute tension UdHop, une tension de point médian d'ensemble de vannes supérieures/inférieures UdMop et une tension de bus basse tension UdNop du pôle opposé ; à corriger α* high end, α* low end, α* high end op et α* low end op selon une position de commutation et de changement de vitesse standard, de sorte à obtenir des angles de déclenchement αhigh end, αlow end, αhigh end op et αlow end op corrigés ; et, selon la relation entre αhigh end et αlow end, et conjointement avec αhigh end op, αlow end op, UdH, UdM, UdN, UdHop, UdMop et UdNop, à déterminer un point de mesure anormale. Le procédé de détermination de mesure anormale de tension côté redresseur de courant continu à tension ultra-élevée applique un principe simple et ne repose pas sur un poste de redressement et un poste onduleur pour la communication de données, ce qui lui confère une valeur pratique d'ingénierie relativement élevée.
PCT/CN2020/116680 2019-09-30 2020-09-22 Procédé de détermination de mesure anormale d'une tension côté redresseur de courant continu à tension ultra-élevée WO2021063208A1 (fr)

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CN112701712B (zh) * 2020-11-30 2021-10-29 中国南方电网有限责任公司超高压输电公司广州局 一种基于换流原理的换流站直流电压测量异常检测方法
CN114172133A (zh) * 2021-12-13 2022-03-11 南方电网科学研究院有限责任公司 一种高压柔性直流输电系统直流电压测量异常检测方法
CN114487558B (zh) * 2022-04-02 2022-07-05 南方电网数字电网研究院有限公司 多级可调的非接触式电压测量方法、装置和电力设备

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