Flexible direct current distribution line fault positioning method based on traveling waves
A flexible DC power distribution and line fault technology, applied in the field of power system, can solve problems such as failure to meet the accuracy requirements of fault segment selection, double-ended protection delay that cannot meet the requirements, and multiple branches.
Pending Publication Date: 2022-03-11
JIANGSU ELECTRIC POWER CO +1
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Problems solved by technology
Under such a short time requirement, the double-ended protection delay caused by signal transmission can no longer meet the requirements, and only fault detection can be carried out according to the single-ended quantity. For fault location, due to the short distance and many branches of the power distribution system, so The accuracy requirements are relatively high, and traveling wave distance measurement is difficult. For example, at a sampling rate of 1MHz, the error of a sampling point is about 300 meters, which does not meet the accuracy requirements for fault section selection
Therefore, fast fault detection of distribution lines can only obtain local information of single-ended
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[0018] Below, combined with Figure 1-2 As well as specific embodiments, the present invention is further described. It should be noted that, under the premise of not conflicting, the various embodiments described below or the technical features can be combined arbitrarily to form new embodiments.
[0019] like figure 1 As shown, a fault location method for flexible DC power distribution lines based on traveling waves is proposed. First, after the DC power distribution system converter is blocked, a sub-module of the control converter is put into operation, and an initial traveling wave is injected; That is, the detection waveform is injected from the measurement point; secondly, the voltage and current of the measurement point are sampled at a high sampling rate, the minimum sampling frequency is 1MHz, and then the positive and negative electrical quantities are decoupled into mutually independent polar modulus and zero mode according to polar mode transformation Perform wav...
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The invention discloses a flexible direct current distribution line fault positioning method based on traveling waves. Relates to the technical field of power systems. Comprising a traveling wave injection step, a sampling step, a signal conversion step, a fault detection step, a fault positioning step and a finishing step. The initial fault point reflection traveling wave is used for identifying the fault section, so that the identification speed of the fault section is greatly improved.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a fault location method for flexible DC distribution lines. Background technique [0002] The DC distribution network has the advantages of small line loss, flexible control, and ability to withstand distributed power sources and multiple loads. However, the rapid development of DC faults in the DC distribution network and the complexity of the control system have brought great difficulties to line protection. In the existing DC fault isolation methods, the AC circuit breaker scheme has long running time, and the DC circuit breaker scheme has problems such as high economic cost. Therefore, the fault isolation converter scheme without DC circuit breaker is more suitable for DC distribution network. In order to ensure the safe and stable operation of the DC distribution network after a fault occurs, fast fault detection and location are required. [0003] Fault detection on...
Claims
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Login to View More IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 刘忠詹昕刘超吾李培培施慎行胡浩宇梁议文董新洲
Owner JIANGSU ELECTRIC POWER CO