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Time synchronization method for process level device of intelligent substation

An intelligent substation and time synchronization technology, applied in radio-controlled timers, synchronization, electronic timers, etc., can solve the problem that the device time synchronization cannot take into account the accuracy and timeliness, so as to improve timeliness, ensure stability and Accuracy, effect of removing normal distribution error and calculation error

Inactive Publication Date: 2015-11-18
XUJI GRP +3
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Problems solved by technology

[0005] The invention provides a time synchronization method for process layer devices in smart substations, aiming to solve the problem that the current synchronization method cannot take into account the accuracy and timeliness of device time synchronization when the external synchronization signal is lost

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  • Time synchronization method for process level device of intelligent substation
  • Time synchronization method for process level device of intelligent substation
  • Time synchronization method for process level device of intelligent substation

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:

[0019] The entire hardware principle of the synchronization method in this embodiment is as follows: figure 1 As shown, it is composed of CPU and coprocessor FPGA. FPGA is mainly used to receive external synchronization signals and analyze them into PPS (pulse per second) and time information. At the same time, the FPGA divides the frequency of the high-precision clock of the constant temperature crystal oscillator to realize functions such as timekeeping. The FPGA realizes the switching of PPS, B code, and 1588 time synchronization mode through the internal state machine jump, as well as the logic switching function of time synchronization, time keeping and self-generated pulse state. The CPU receives the time information parsed by the FPGA and the time stamp of the second pulse, and implements the 1588 protocol through the internal MAC of the CPU and th...

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Abstract

The invention relates to a time synchronization method for a process level device of an intelligent substation, and the method comprises the steps: detecting whether there is an external synchronization signal or not in real time; entering into a time synchronization state if there is the external synchronization signal, and outputting a synchronization pulse through an FPGA; recording a series of continuous time intervals of time synchronization pulse at the time synchronization state through a counter in the FPGA, and enabling the time intervals to be sequentially stored in an internal memory of the FPGA in a circulating manner; judging whether the number of stored time intervals reaches a set value or not if there is no external synchronization signal; entering into a punctual state if the number of stored time intervals reaches the set value; enabling the number of stored time intervals to be outputted and form a punctual pulse; entering into a self-generating pulse state if the number of stored time intervals does not reach the set value, and generating a second pulse through a constant temperature crystal oscillator. The method provided by the invention can give consideration to the accuracy and timeliness of time synchronization of the device.

Description

technical field [0001] The invention belongs to the field of power system protection automation, and in particular relates to a time synchronization method for a process layer device of an intelligent substation. Background technique [0002] With the continuous expansion of the scale of the power system, large-capacity, ultra-high voltage, and long-distance power transmission are increasing, and the system structure is becoming more and more complex, so the clock synchronization of the power system is becoming more and more important. Therefore, clock synchronization technology is widely used in electric power. At present, clock synchronization has been applied to power dispatching system, relay protection device, EMS energy management system, fault recorder, distributed RTU (telecontrol terminal), substation integrated automation system and telemetry, remote signaling data processing and high-voltage power transmission Line fault location, etc. [0003] The process layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06G04R20/00G04G7/00
Inventor 牟涛周水斌马仪成刘晓霞赵应兵周丽娟
Owner XUJI GRP
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