Hybrid sampling synchronization method for onsite protection device
A technology of mixed sampling and protection devices, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc. Solve synchronization problems, improve flexibility and simplicity, and meet the effect of real-time computing
Inactive Publication Date: 2016-09-28
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology
[0003] Since the merging unit has a fixed delay, the bus voltage collected by the merging unit is not synchronized with the interval voltage sampled by the cable. If it is not processed, the reclosing function will be affected; if the method of synchronizing first and then performing the protection logic operation is used, the protection will be affected. The quick action of the system cannot reflect the advantages of local protection; if the two sets of data are processed separately, that is, the synchronized voltage and current complete the reclosing function that does not require high time accuracy, and the unsynchronized interval voltage and current data complete Protection trip logic operation, this scheme needs to complete two sets of data processing in one device, which is very difficult to realize, and the amount of change is huge on the basis of the existing program
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[0015] The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0016] In the smart substation in-situ protection configuration scheme, the line protection is unprotected and bare-installed according to the interval, and the line voltage and line current of the interval are collected through the cable, and the bus voltage is collected through the point-to-point connection of the optical fiber to the merging unit, and the bus voltage is converted into IEC through the merging unit The 61850-9-2 message is sent to the line protection device through the fiber channel point-to-point.
[0017] The hybrid sampling synchronization method of the in-situ protection device, considering the delay due to the merging unit, introduces the rotation angle formula. The specific method is as follows: when the in-situ line protection device performs synchronous detection and re...
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The invention discloses a hybrid sampling synchronization method for an onsite protection device. The method is characterized in calculating the angle difference between a bus voltage angle which is digitally sampled at a current moment and a practical angle delay by use of an angle conversion formula when the onsite protection device carries out synchronization reclosing; carrying out angle compensation to the calculated bus voltage angle according to the angle difference, wherein the bus voltage after the angle compensation and a line voltage satisfy a synchronization demand and can be directly used for synchronization reclosing logic judgment. According to the method, the synchronization problem of the hybrid sampling data of the onsite protection device is effectively solved.
Description
technical field [0001] The invention relates to a mixed sampling synchronization method for an in-situ protection device, which belongs to the technical field of electric power system automation. Background technique [0002] The on-site secondary equipment network architecture based on no protection and switch yard installation is simple, and on-site cable sampling and cable tripping solve the problems caused by long cable transmission signals such as CT saturation, multi-point grounding, loop crosstalk, and distributed capacitance discharge. . The in-situ protection device has no intermediate links, and the protection action is fast, which has great advantages. The on-site line protection device collects the line voltage and current of the interval through the cable, and at the same time needs to collect the bus voltage to complete the no-voltage detection and synchronization detection functions of the reclosing. Complex and difficult to implement. Therefore, each bay p...
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IPC IPC(8): H03L7/00H02H3/06
CPCH03L7/00H02H3/06
Inventor 陈福锋陈琦张尧陈宏岩
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD