A method and device for detecting power loss of AC section
A technology of electrical detection and cross-section, which is applied in the field of power systems, can solve problems such as failure to timely detect the power failure of AC cross-sections, and achieve the effect of accurate judgment
Active Publication Date: 2021-11-16
XUJI GRP +1
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Problems solved by technology
[0007] The purpose of the present invention is to provide a method and device for detecting AC section power failure to solve the existing problem that the AC section power failure cannot be detected in time
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Embodiment Construction
[0041] Embodiment of the method for detecting the loss of electricity in the AC section:
[0042] The number of outgoing lines on the substation side and the converter station side is not fixed, and can be 1, 2, 3... lines. In this embodiment, the case where there are two outgoing lines on the substation side and the converter station side is introduced as an example, as shown in figure 1 shown.
[0043] The substation side includes line 1 and line 2. The line outlet end of line 1 is located between the middle switch B-O0 and the side switch C-O0, and the line outlet end of line 2 is located between the side switch A-O0 and the middle switch B-O0. . The side of the converter station includes line 1 and line 2. The line outlet of line 1 is located between the side switch A-O0 and the middle switch B-O0, and the line outlet of line 2 is located between the middle switch B-O0 and the side switch C-O0 between. The line outlet end of line 1 in the substation is connected to the ...
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The invention relates to a method and device for detecting power failure of an AC section, belonging to the technical field of intelligent substation testing. The method includes the following steps: 1) Acquiring the detection information of the substation side line and the detection information of the converter station side line, the detection information includes the switch status information, electrical quantity information and maintenance status information of the line; 2) according to the substation side line According to the detection information of the substation side line, it can be judged whether the substation side line is tripped; according to the detection information of the converter station side line, it is judged whether the converter station side line is tripped; 3) If the substation side line is tripped and the converter station side line is tripped, it is determined that the AC section Electricity. The present invention realizes the accurate judgment of the power failure of the AC section through the switch status information, electrical quantity information and maintenance status information of the substation side line and the converter station side line, and avoids the damage to the DC system when the AC section is powered off. The damage of thyristor or IGBT components provides a strong guarantee for the safe and stable operation of the DC system.
Description
technical field [0001] The invention relates to a method and device for detecting power failure of an AC section, belonging to the technical field of electric power systems. Background technique [0002] The so-called AC section power loss refers to the situation that all AC power supplies of the local DC system are lost. [0003] For conventional DC projects, the overvoltage after the AC section is de-energized is caused by the power surplus problem, that is, after the AC section of the receiving end is de-energized, the power is continuously injected into the AC filter capacitor, resulting in a high continuous overvoltage, which causes the arrester to bear a large energy stress. [0004] For the flexible DC project, the overvoltage after the AC section loses power is due to the fact that after the last circuit breaker trips, if the reference value of active power is reduced to zero, the flexible DC has no abnormal signal to quickly block the DC. At this time, just becaus...
Claims
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IPC IPC(8): G01R31/56G01R31/68
Inventor 张红跃刘志文陈海龙沈燕华徐立明赵艳茹赵瑞东肖志刚苗志峰董世军徐玉洁姜东东崔敏樊莹杜延辉李甜张经纬
Owner XUJI GRP