Converter station DC voltage measurement anomaly detection method based on converter principle
A DC voltage and anomaly detection technology, applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., can solve the problem that it is difficult to adapt to different DC operation modes and different control and protection technology routes, the detection logic is complicated, and it takes a lot of time Judgment and other issues, to achieve high economic benefits and the effect of popularization and application value
Active Publication Date: 2021-04-23
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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[0003] At present, the abnormal judgment of DC voltage measurement is mainly judged by the deviation of AC and DC power, the calculated value of DC loop resistance, the trigger angle / extinguishing angle, and the gear position of the tap changer, which is not intuitive enough, the detection logic is complicated, and it is difficult to adapt to different DC operation modes and For problems such as different control and protection technical routes, operators need to spend more time judging the specific fault point
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[0044] It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or process that includes a series of steps or units. The apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to the process, method, product or apparatus.
[0045] see Figure 1 to Figure 4 , figure 1 It is the comparison between the measured value and the calculated value of the DC voltage of the converter in the inverter station; figure 2 It is the logic diagram of DC voltage abnormality detection for ultra-high voltage technology route; image 3 It is the DC voltage anomaly detection logic for Siemens UHV technology route; Figure 4 It is the DC voltage anomaly detection logic for Nanrui UHV technology route.
[0046] In the present invention...
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The invention discloses a converter station DC voltage measurement anomaly detection method based on a converter principle, and relates to a DC measurement system. The method comprises the following steps of: obtaining an inverter station converter DC voltage according to an inverter station converter transformer valve side ideal no-load voltage, inverter station converter extinction angles, the equivalent commutation reactance and DC current of each inverter station converter, and the number of six-pulse inverter bridges in each converter; obtaining the inverter station converter transformer valve side ideal no-load voltage according to the inverter station converter transformer valve side no-load voltage, inverter station alternating-current bus voltage, the transformation ratio of an inverter station converter transformer tap switch is located at the lowest tap position, the step length of the influence of the tap switch for adjusting one tap position on the transformation ratio and the tap position of the converter transformer tap switch; and setting an upper limit early warning and a lower limit early warning by taking the calculated value of the inverter station converter DC voltage as a center, and judging DC voltage abnormal fault points and fault conditions through early warning conditions.
Description
technical field [0001] The invention relates to a direct current measurement system, in particular to a method for detecting abnormalities in direct current voltage measurement of a converter station based on the principle of commutation. Background technique [0002] As an important equipment of HVDC transmission system, the DC measurement system plays an important role in the safe and stable operation of the DC system. In recent years, DC voltage measurement abnormalities have occurred many times in the converter stations under the jurisdiction of the China Southern Power Grid, causing DC system voltage fluctuations, abnormally large / small abnormalities, and even lead to control protection malfunction tripping, which seriously threatens the DC system safe and stable operation. A lot of research work has been done domestically on the cause of the abnormal occurrence of DC voltage measurement. The RTDS simulation research results show that the cause of the abnormal DC volt...
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IPC IPC(8): H02J3/36H02H7/26H02J13/00G01R19/165
CPCG01R19/16538H02H7/268H02J3/36H02J13/00001H02J13/00002H02J13/00006Y02E60/00Y02E60/60Y04S10/20Y04S40/12
Inventor 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
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION