Message self-adapting method for digital input electric energy meter

Abstract

The invention discloses a message self-adapting method for a digital input electric energy meter. The method comprises the steps of: firstly, carrying out VLAN (virtual local area network) mark length adaptive processing; if the message is identified to be IEC(international electrotechnical commission) 618509-2(LE) type of message, reading quantity parameter of an ASDU (application service data unit) in the message after an APDU (application protocol data unit) marks a position, and carrying out cycle analysis on each ASDU; if the message is identified to be IEC618509-1 type of message, calculating out corresponding ASDU quantity according to an IEC618509-1 standard protocol, carrying out cycle analysis on each ASDU, calculating an opposite position of each parameter in corresponding ASDU; reading out a sampling frequency value; and judging whether a drop frame appears and reading out the voltage and current sampling values in the message, so the digital input electric energy meter can automatically adapt with change of a sampling message of an IEC61850 process layer. Manual configuration is not needed, thus the maintenance cost of meter metering is reduced.

Description

technical field [0001] The invention relates to a message self-adaptive method for a digital input electric energy meter, in particular to a 0.2S digital input electric energy meter based on the IEC61850 standard, so that the electric energy meter can automatically identify IEC61850 9- 1, 9-2, 9-2LE and other three process layer sampling message functions, and a sampling message identification method that can adapt to changes in message parameters. Background technique [0002] With the development of smart grid, digitalization and intelligence of substations have become a trend. The digital substation is different from the traditional substation. Its architecture is based on the IEC61850 standard. It adopts a three-layer structure of the process layer, the interval layer and the station control layer. The traditional transformer is replaced by an electronic transformer at the front end, so it can support optical fiber access. The digital input energy meter has also replace...

AI Technical Summary

Problems solved by technology

Different digital substations have different support for IEC61850. For example, some stations support IEC61850 9-1 process layer sampling message protocol, while others support IEC61850 9-2 or 9-2LE, or Parameters such as synchronization methods are different. Some stations have switch mode and non-switch mode, that is, the switch will retain or filter out the VLAN ID in the message, resulting in a change in the length of the sampled message.

[0003] The above problems will lead to frequent configuration parameters of the digital input electric energy meter. At present, there is a configuration method that directly downloads the SCD configuration file of the merging unit to the meter for analysis, but this is only applicable to some digital inputs that support the station control layer protocol. energy meter, and the analysis of the SCD file requires the purchase of a third-party program package, thereby increasing the cost of the meter

Another existing configuration method is manual on-site configuration. However, due to the large number of parameters that need to be configured, this method has a large workload and increases maintenance costs.

Because energy meter products are different from other equipment in digital substations, they have high requirements for cost control, and too complicated parameter configuration will increase the design and maintenance costs of digital input energy meters, which is not conducive to strict cost control

Images