CN105372611B - The reliability verification method of SV data is acquired based on wave recording device - Google Patents

Abstract

The invention relates to a reliability verification method for collecting SV data based on a wave recording device. Set N groups of SV messages, and set the rated delay, voltage channel fundamental wave, current channel fundamental wave and harmonic content of SV link channels; apply harmonics, voltage and current. Use the wave recording device to record the waveforms generated by each group of SV data, and use the tester to obtain the harmonic content, voltage and current amplitude accuracy and phase difference of the same phase channel in each waveform, and judge whether it meets the SV data collected by the wave recording device If the reliability error requirements are met, it can be verified that the SV data collected by the wave recording device has certain reliability. The method for verifying the reliability of the SV data collected by the wave recording device of the present invention is simple in process and high in testing efficiency and accuracy.

Description

Reliability Verification Method of SV Data Acquisition Based on Wave Recording Device

technical field

The invention relates to a reliability verification method for collecting SV data based on a wave recording device, and belongs to the technical field of data collection of intelligent substations.

Background technique

In recent years, electricity has provided strong support and strong guarantee for the rapid development of my country's economy, and the application of digital smart substations has become more and more popular in my country. The failure of any part of the entire power system will have a direct or indirect impact on the development of the national economy. As a "black box" in the power system, the intelligent fault recording device (dynamic recording device) can truly record the operation information of the power system, and accurately locate and analyze the cause of the fault. Therefore, the intelligent fault recording device is to ensure the safe operation of the smart substation key part of . It is necessary to detect the reliability of the SV message collected by the fault recorder at any time.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and proposes a reliability verification method based on wave recording devices to collect SV data, which is used to prove the accuracy of SV data collected by wave recording devices in smart substations.

The present invention is achieved through the following scheme:

The reliability verification method of collecting SV data based on the wave recording device, the steps are as follows:

Step 1. Set N groups of SV messages, and set the rated delay of the SV link channel, the fundamental wave of the voltage channel, the fundamental wave of the current channel, and the harmonic content; Harmonics, apply different multiples of rated voltage Un to the voltage channels of each group of SV links, apply different multiples of rated current In to the protection current channels and measurement current channels of each group of SV links;

Step 2, use the wave recording device to record the waveform generated in step 1, connect the tester to the wave recording device, and obtain the harmonic content, voltage and current amplitude accuracy of each order in each waveform, and the phase of the in-phase channel Difference;

Step 3, calculate the error of the harmonic content, the accuracy of the voltage and current amplitude, and the phase difference of the same-phase channel, and judge whether the SV data collected by the wave recording device has a reliable error according to the set standard, and if it is satisfied, that is It can be verified that the SV data collected by the wave recording device has certain reliability.

Further, the rated voltage Un in step 1 is 57.74V, and the rated current In is 1A.

Further, the rated time delays set in step 1 are 757us, 1399us, 800us and 1629us respectively; the fundamental wave of the voltage channel is 57.74V; the fundamental wave of the current channel is 1A; the harmonic content is 20%.

Further, in step 3, the error that satisfies the reliability requirements of the SV data collected by the wave recording device is: the amplitude accuracy of the voltage is at most no more than 0.1%, and the amplitude accuracy of the protection current is at most no more than 0.1%. If it exceeds 2%, the amplitude accuracy of the measured current is not more than 2%, the harmonic content error is not more than 5%, and the phase difference of the same-phase channel is not more than 2%.

The beneficial effect of the present invention compared with prior art is:

The present invention proposes a reliability verification method for collecting SV data based on a wave recording device, by applying different times of harmonics to the SV link channels, and applying different multiples of rated voltages and different multiples of harmonics to the channels of each group of SV links Rated current, use the wave recording device to record various waveforms generated by the SV message file, and connect the tester to the wave recording device to obtain the harmonic content, amplitude accuracy and phase difference of the same phase channel in the SV waveform file. According to the error that meets the requirements, the reliability of the SV data collected by the wave recording device can be judged. In the method for verifying the reliability of SV data collected by the wave recording device of the present invention, the process is simple, the test efficiency and accuracy are high, it is a very effective way to verify the reliability of the wave recording device, and it can be widely used in the detection of various intelligent substations .

Description of drawings

Fig. 1 is a flow chart of the reliability verification method for collecting SV data based on a wave recording device according to the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Based on the reliability verification method of SV data collected by the wave recording device, since the synchronous sampling algorithm plays a key role in the program of the entire wave recording device, and the most commonly used synchronization algorithm is the interpolation algorithm at present, therefore, in this embodiment, the verification Taking the reliability of the SV data collected by the wave recording device using the interpolation algorithm as an example, the steps are as follows:

(1) Setting of SV link: design a message file that contains 4 groups of SV links in the present embodiment. In order to verify the impact of different sampling times on the reliability of SV data collected by the interpolation algorithm, under the premise of sampling 4000 points per cycle, set the typical rated delays for each group of links: 757us, 1399us, 800us and 1629us ( As shown in Table 1). Set the fundamental wave of the voltage channel in the SV link to 57.74V, the fundamental wave of the current channel to 1A, and the harmonic content is 20%.

As shown in Table 1, harmonics of different orders are applied to each group of SV links at regular intervals. In this embodiment, the 12th harmonic is applied within the first 0.5 second, the 13th harmonic is applied within the second 0.5 second, the 15th harmonic is applied within the third 0.5 second, and the 20th harmonic is applied within the fourth 0.5 second. Subharmonic, 25th harmonic applied within 5th 0.5 seconds; data from 2.6 seconds onwards are used to calculate accuracy.

Then, for the voltage channels of each group of SV links, a certain multiple of the rated voltage Un=57.74V is applied at regular intervals. In this embodiment, voltage values are applied to the voltage channels of each group of SV links every 0.5s, and the specific voltage values are: 0.1Un, 0.5Un, Un, 2Un. For the protection current channels and measurement current channels of each group of SV links, a certain multiple of rated current In=1A is applied at regular intervals; The current value is applied to the channel, the specific current value is: 0.1In, 0.5In, In, 2In, 20In, the current value is applied to the measurement current channel, the specific current value is: 0.1In, 0.2In, 0.5In, In, 2In.

Table 1 SV link design

(2) Use the wave recording device to record the waveforms generated by the harmonics, voltage and current applied to the SV link by using the interpolation algorithm. Then, use the point-to-point mode to connect each optical port of the tester to each collection optical port of the wave recording device. Use the tester to play back the message, and check the harmonic content of each order, the accuracy of the voltage and current amplitude, and the phase difference of the same-phase channel. If the calculated voltage and current amplitude accuracy error does not exceed the set range (the specific set range is shown in Table 5), the harmonic content error is not greater than 5%, and the phase difference of the same-phase channel is not greater than 2%, It proves that the SV data collected by the wave recording device using the difference algorithm has certain reliability.

The model of the wave recording device selected in this embodiment is WGL-801B intelligent substation wave recording device, and the model of the selected tester is the RTS-100DG optical digital relay protection tester of Yongcheng Technology.

Experimental analysis and conclusion:

The APPIDs of the four sets of SV links are 4074, 4075, 4076, and 4077, respectively. The reliability of the SV data collected by the wave recording device using the interpolation algorithm is verified by using the above method. In the harmonic test experiment (as shown in Table 2), taking bus 1A phase protection voltage 1 and protection 1 current A phase 1 in the SV link as examples, set the bus 1A in the SV link numbered 4075 The rated time delay of phase protection voltage 1 is 1399, set the rated time delay of protection 1 current A phase 1 in the SV link numbered 4074 to 757, and set the protection voltage 1 of bus 1A phase in the SV link numbered 4077 The rated time delay of the protection 1 current A phase 1 in the SV link whose number is 4076 is set to 800. The results of each harmonic waveform obtained by using the above verification method are shown in Table 2. The error of each channel is less than 5% of the requirement under different sampling times and different harmonics, which proves that the wave recording device uses The interpolation algorithm has good reliability in collecting SV data.

In the experiment of the voltage and current amplitude accuracy and phase difference of each channel of the SV link (as shown in Table 3 and Table 4), for the voltage channels of the SV link, the protection voltage of the bus 1A phase is 2Un, and the bus 1B phase protection voltage is 2Un. The protection voltage is Un, the bus 1C phase protection voltage is 0.5Un, and the bus 2A phase protection voltage is 0.1Un; for the protection current channel of the SV link, the protection 2 current A phase is 50In, the protection 2 current B phase is 20In, Protection 1 current A phase is In, protection 1 current B phase is 0.5In, protection 1 current C phase is 0.1In; for the measurement current channel of the SV link, apply measurement 1 current A phase to 2In and In respectively, and measure 1 current The B phase is 0.5In and 0.2In, and the measurement 1 current C phase is 0.1In. The current and voltage accuracy results obtained through the test are shown in Table 3, and the results of each phase difference of the voltage are shown in Table 4. From the analysis of Table 3 and Table 4, it can be concluded that the amplitude accuracy of the voltage, protection current and measurement current of each channel The error is not greater than the error value of each parameter required in Table 5, and the phase difference of the protection voltage of each in-phase channel is also less than 2°, which also proves that the wave recording device uses the interpolation algorithm to collect SV data with certain reliability.

In summary, using the method of the present invention can effectively verify whether the SV data collected by the wave recording device in the smart substation is reliable.

Table 2 each harmonic error record

Table 3 Data accuracy records under different amplitudes

Table 4 Phase difference record

Compare channels (example) The phase difference between the same-phase channels of the 4 groups of links Bus 1A phase protection voltage <2° Bus 1B phase protection voltage <2° Bus 1C phase protection voltage <2°

Table 5 SV conversion amplitude accuracy requirements

In this embodiment, the reliability of SV data collected by the wave recording device using an interpolation algorithm is verified. In this embodiment, the interpolation algorithm is only used as an example, and the present invention is not limited thereto. As other implementation manners, the method of the present invention can also be used to verify the reliability of SV data collected by the wave recording device using other synchronization algorithms.

Under the idea given by the present invention, the technical means in the above-mentioned embodiments are transformed, replaced, and modified in ways that are easy for those skilled in the art, and the functions played are basically the same as those of the corresponding technical means in the present invention. 1. The purpose of the invention realized is also basically the same, and the technical solution formed in this way is formed by fine-tuning the above-mentioned embodiments, and this technical solution still falls within the protection scope of the present invention.

Claims (4)

1. based on the reliability verification method of wave recording device collecting SV data, it is characterized in that, the steps are as follows: Step 1, set N groups of SV messages, and set the rated delay of the SV link channel, the fundamental wave of the voltage channel, the fundamental wave of the current channel, the harmonic content of the current channel, and the harmonic content of the voltage channel; Different times of harmonics are applied to the SV link, different multiples of the rated voltage Un are applied to the voltage channels of each group of SV links, and different multiples of the rated current In are applied to the protection current channel and the measurement current channel of each group of SV links. ; Step 2, using the wave recording device to record the waveform generated in step 1, connecting the tester to the wave recording device, and obtaining the harmonic content, voltage and current amplitude and the phase of the in-phase channel in each waveform; Step 3, calculate the error of the harmonic content, the accuracy of the voltage and current amplitude, and the phase difference of the same-phase channel, and judge whether it meets the error of the reliability of the SV data collected by the wave recording device according to the set standard, and if it is satisfied, it can be It is verified that the SV data collected by the wave recording device has certain reliability. 2. The method for verifying the reliability of SV data collected by a wave recording device according to claim 1, wherein the rated voltage Un described in step 1 is 57.74V, and the rated current In is 1A. 3. The method for verifying the reliability of SV data collected by a wave recording device according to claim 1, wherein the rated time delays set in step 1 are respectively 757us, 1399us, 800us and 1629us; It is 57.74V; the fundamental wave of the current channel is 1A; the harmonic content is 20%. 4. the reliability verification method based on wave recording device collecting SV data according to claim 1, it is characterized in that, described in step 3, meet the error that wave recording device collects SV data and have reliability is: described voltage The maximum amplitude accuracy is not more than 0.1%, the maximum amplitude accuracy of the protection current is not more than 2%, the maximum amplitude accuracy of the measurement current is not more than 2%, and the harmonic content error is not more than 5%. , the phase difference of the same-phase channel is not greater than 2%.