Embedded fault oscillograph suitable for DC control protection system

Abstract

The invention discloses an embedded fault oscillograph suitable for DC control protection system. The fault oscillograph comprises a programmable logic controller, a microprocessor, a differential communication chip, a fault determining assembly and a first chip; the programmable logic controller is in communication connection with external equipment via the differential communication chip, obtains wave recording data of the external equipment via the differential communication chip, and writes the wave recording data into the first chip; the fault determining assembly determines whether thereis a fault in the external equipment, and if YES, a time point of the fault is determined; the programmable logic controller obtains wave recording data in the fault time point and within preset timebefore and after the fault time point via the first chip and further obtains the fault wave recording data, and the fault wave recording data is sent to the microprocessor; and the microprocessor generates a fault wave recording file according to the fault wave recording data. The fault oscillograph is high in integrate degree, reduces the equipment cost, and meets the light and compact trend forsecond equipment of the power system.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to an embedded fault recording device suitable for direct current control and protection systems. Background technique [0002] Flexible DC transmission is a new generation of power transmission technology following AC transmission and conventional DC transmission. It can independently adjust reactive power while controlling the transmitted power. There is no commutation failure problem in flexible DC transmission, and there is no need to configure filtering and reactive power compensation equipment, and it is easy to build a multi-terminal DC network. It can solve many technical bottlenecks faced by current AC and DC transmission, improve the performance of wind power access, greatly improve low-voltage ride-through capability and system stability, and is the only technical means for long-distance offshore wind power grid integration. The emergence of ...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides an embedded fault recorder suitable for DC control and protection systems to solve the problem that the fault recorder in the prior art uses independent equipment, which requires independent power supply and data storage equipment, and the equipment requires The number of screen cabinets is large, and the cost of equipment manufacturing is relatively high.

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