Real-time sharing method of multi-interval transient traveling wave signals in smart substation
A technology of smart substation and transient traveling wave, applied in the field of electric power system, can solve the problems of unsatisfied real-time performance of the communication network in the substation process layer, communication network performance blockage, communication network blockage, etc., to achieve strong practicability and good economy , performance-enhancing effects
Active Publication Date: 2015-10-28
TSINGHUA UNIV
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[0004] Relevant studies have shown that based on OPNET Modeler software simulation of process bus communication for information sharing under 100Mbit / s Ethernet, when the sampling rate rises to 1000-1553 points per cycle, the process layer network can only guarantee real-time transmission of single-interval data. When the sampling rate When higher, the communication network performance will be severely blocked
The sampling rate of traveling wave line selection is generally above 200kHz, reaching 4000 points per cycle, and the process layer communication network is multi-interval data transmission. If the data is not processed, the communication network will be seriously blocked, resulting in substation process layer The real-time performance of the communication network cannot be satisfied
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[0024] The process layer communication example of the wind farm grid-connected intelligent substation applying the present invention is described as follows:
[0025] refer to figure 1 , the relevant parameters of the system are as follows: the voltage level of the transformer is 110kV / 35kV; the impedance of the primary side of the transformer is 1.07Ω+j38.8652mH, and the impedance of the secondary side is 0.1083Ω+j0.96mH; the line resistance value is 0.46Ω / km, and the reactance value is 0.3119Ω / km, the length of 110kV grid-connected transmission line is 2km, and the length of 35kV feeder figure 1 The distances from top to bottom are 20km, 20km, 10km and 40km respectively, and a single-phase (C-phase) ground short circuit occurs in the bottom line at 10ms.
[0026] (1), the merging unit collects the zero-sequence current traveling wave signal of each line 10ms after the fault occurs at a sampling rate of 500kHz 0 (n) As shown in Table 1 (the current value of 0-227ms is 0A, ...
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The invention discloses a method for sharing multi-interval transient traveling wave signals of an intelligent substation in real time. The method comprises the steps that the voltage and current signals of a measurement line are collected by each merging unit in real time; an edge detecting method is utilized for carrying out fault feature extraction on real-time sampling data; sampling value message information is reconstructed, and a set of traveling wave feature values used for judging a fault line is added to an ASDU; meanwhile, the merging units reduce message transmission frequency, and 100M Ethernet downward traveling wave message transmission frequency is reduced to the power frequency signal sampling frequency of 1,000 Hz; IED equipment is protected and controlled to receive and analyze traveling wave messages sent by the merging units, and the fault line is judged according to fault feature values including in the messages. The data processing capacity of the merging units is utilized for expressing the effective fault features of the transient traveling wave signals, the performance of a substation protection and control system is improved by fully utilizing fault full spectrum band information, the real-time performance of the communication of a substation process level can be guaranteed, and high practical value is achieved.
Description
Technical field: [0001] The invention belongs to the technical field of power systems, in particular to a real-time sharing method for multi-interval transient traveling wave signals of an intelligent substation. Background technique: [0002] The current implementation of smart substation process layer communication is mainly point-to-point communication based on the IEC61850 communication protocol, but there is no doubt that compared with traditional substations, the main advantages of smart substations are reflected in the sharing, fusion and effective use of cross-interval and full-band information. Cross-interval information sharing reflects the requirements for process-level network communication; while full-band information emphasizes the horizontal utilization of the entire frequency band of fault information from DC components to transient traveling waves. Compared with power frequency signals, transient traveling wave signals are not affected by system oscillation,...
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IPC IPC(8): H02J13/00
CPCY02E60/723Y02E60/7838Y04S10/16Y04S40/124Y02E60/00
Inventor 王宾倪江耿建昭董新洲
Owner TSINGHUA UNIV