Network time-setting system and method for secondary equipment of electric power system

Abstract

The invention discloses a network time-setting system and method for secondary equipment of an electric power system. The network time-setting system is characterized by comprising a CPU (central processing unit), an FPGA (field programmable gate array), a physical layer network card chip PHY and an oven controlled crystal oscillator OCXO, wherein the CPU is connected with the FPGA through a PCIE (peripheral component interface express) bus; the FPGA comprises Ethernet medium access controllers (MAC) which are realized through the FPGA, a hardware time stamp detecting and generating module and a phase locking loop (PLL). The time-setting method comprises the following steps: inputting setting time through a network, filtering messages, improving the time -setting synchronizing precision of the messages, adding hardware time stamps to the messages through the FPGA, synchronizing network setting-time, and outputting network setting-time. The network time-setting system disclosed by the invention uses the FPGA as a core, and under the condition that a hardware structure is not changed, multichannel high-precision network time setting can be realized at a relatively low cost; besides, through the phase locking loop (PLL) and a technique of additionally stamping the hardware time stamps on an MII (media independent interface) layer, the network time-setting precision can also be greatly improved, and the expansion performance is good.

Description

technical field [0001] The invention relates to a time synchronization system and method for a secondary equipment network of a power system, belonging to the technical field of power automation. Background technique [0002] In smart substations, the application of synchronous time synchronization of secondary equipment begins to transition from pulse logic time synchronization to digital network time synchronization, which is an inevitable requirement for full digitalization of smart substations. Since the secondary equipment such as the merging unit and PMU (Phasor Measurement Unit) in the smart substation has high requirements for timing accuracy and stability, the remaining secondary equipment has high requirements for timing accuracy in order to improve sampling accuracy and facilitate accident analysis. Higher and higher. Therefore, high-precision network time synchronization has become a basic function of secondary equipment in power systems. [0003] At present, t...

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Problems solved by technology

[0006] In order to solve the deficiencies in the prior art, the present invention provides a power system secondary equipment network time synchronization system and its time synchronization method, which solves the problems of high cost of time synchronization chips and limited number of independent ports for input and output of secondary equipment question

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