Digital substation whole station power quality online monitoring device

Abstract

The invention provides a digital substation whole-substation power quality on-line monitoring device comprising a signal receiving module, a general message parsing module, a power quality analyzing and processing module and a signal output module. The signal receiving module is used for receiving a power quality signal of a digital substation, stamping a time mark on the power quality signal and sending the power quality signal to the general message parsing module. The general message parsing module is used for parsing the power quality signal sent by the signal receiving module and sending the parsed power quality signal to the power quality analyzing and processing module. The power quality analyzing and processing module is used for receiving and analyzing the parsed power quality signal sent by the general message parsing module to obtain an analysis result. The signal output module is used for outputting the analysis result obtained from the power quality analyzing and processing module. With the digital substation whole-substation power quality on-line monitoring device of the invention, the power quality operation condition in the digital substation can be monitored and pre-warned in real time so that whole-substation power quality monitoring, alarming and comprehensive-evaluation can be completed.

Description

technical field [0001] The invention relates to the technical field of electric energy quality of a digital substation in a power system, in particular to an on-line monitoring device for power quality of a whole station based on a digital substation. Background technique [0002] The smart grid is the future development direction of the power system, and the digital substation is a key node of the smart grid. Compared with traditional substations, digital substations have great advantages. The digital substation uses electronic or photoelectric transformers to realize signal measurement, and directly outputs digital signals on the secondary side and transmits them to the merging unit through optical fibers. The data is packaged according to IEC61850-9-1, IEC61850-9-2, and IEC60044-8 protocols , and then realize bulk data transmission via optical fiber. Digital substations use smart switches or smart terminals, and use GOOSE messages and optical fiber Ethernet to transmit ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are no application reports of power quality monitoring devices in digital substations that have been built and put into operation abroad; digital power quality monitoring devices have gradually begun to be used in some domestic digital substations, but the solution is still the same as conventional substations. The monitoring device configuration of the loop cannot meet the needs of secondary equipment construction for the digital substation network; at the same time, this part of the device generally has the following problems:

[0005] The performance of the hardware platform is insufficient, and the computing power cannot meet the computing needs when multiple monitoring points are connected. Moreover, considering the subsequent increase in the output sampling rate of the MU, the processing performance requirements of the platform are further improved, and the existing public devices cannot meet the computing performance requirements.

[0006] (2) Insufficient access ports

Many digital substations currently in operation use point-to-point access (MU signals are not directly connected to the device through a switch), or there are many MUs during network access, which leads to complex networking. In these areas, at least 24 optical Ethernet ports are required. The entrance can meet the power quality signal access requirements of the whole station

None of the existing public power quality monitoring devices can meet this access requirement

[0007] (3) Unable to give corresponding message error analysis

In the case of message errors, the power quality index is still analyzed, which causes a lot of trouble to the operating personnel

Operators often need to spend a long time and energy to analyze the cause of incorrect power quality data from the network message analysis device, and only through manual integration can comprehensive analysis be carried out, which not only brings new problems to operation, maintenance, commissioning and troubleshooting. Inconvenient, but also prolongs troubleshooting time and degrades power quality

[0008] (4) It does not meet the access of IEEE1588 precision clock signal, and the subsequent expansion capability is insufficient

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