CN108845281B - Online comparison detection method for power quality monitoring device - Google Patents
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- CN108845281B CN108845281B CN201810590039.1A CN201810590039A CN108845281B CN 108845281 B CN108845281 B CN 108845281B CN 201810590039 A CN201810590039 A CN 201810590039A CN 108845281 B CN108845281 B CN 108845281B
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Abstract
The invention relates to the technical field of power equipment detection, in particular to an online comparison detection system and an online comparison detection method for a power quality monitoring device, wherein the system comprises a signal acquisition module, a standard power quality monitoring device, a detected power quality monitoring device, a network switch and a detection host Manpower and material resources cost are reduced, and the regular detection work of the power quality monitoring device can be effectively carried out.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to an online comparison detection method for a power quality monitoring device.
Background
The operation management of the power quality monitoring device is one of the work contents of power quality technical supervision. After the power quality monitoring device runs in a severe electromagnetic environment for a long time, the reliability and the measurement accuracy of the power quality monitoring device are inevitably reduced due to aging and failure of components, so that a large amount of invalid and abnormal data is generated, and the power quality monitoring device needs to be periodically detected.
At present, the detection of the power quality monitoring device is usually realized based on a standard source method, and there are two main realization methods: 1. the power quality on-line monitoring device is detached and sent to a laboratory, then a standard source is controlled to output a power quality signal with specified parameters to the power quality monitoring device, and finally a measurement result of the power quality monitoring device is compared with the standard signal, so that whether the measurement accuracy of the device is qualified or not is judged. However, the power quality monitoring device needs to be disassembled and assembled back and forth for a plurality of times of work tickets, and in addition, the transportation is troublesome and time-consuming, so that long time is consumed for completing one-time inspection, the working efficiency is very low, and the normal work of the power quality monitoring device is seriously influenced. 2. And carrying the standard source to the site, and then detaching the power quality monitoring device for site detection. The disadvantage of this method is that the standard source (such as FLUKE 6100 series) is usually bulky and not easy to carry, the instrument is very precise and easy to damage, and sometimes several standard sources are carried to form a three-phase loop for detection. Although some portable standard sources (such as CMC series standard sources produced by Omicron company) are convenient and easy to use, the accuracy of the output signal is low, and particularly, the generation of some high-harmonic signals is not ideal, so that the detection result of the monitoring device is influenced necessarily.
In summary, the prior art has many defects, and because the online power quality monitoring devices have the characteristics of numerous and scattered installation, if the online power quality monitoring devices are periodically detected according to the prior art, great manpower and material resources are inevitably required to be input, so that the realizability is poor, and the periodic detection work is difficult to be effectively carried out.
Disclosure of Invention
In order to solve the problems, the invention provides an online comparison detection system of a power quality monitoring device, which has the following specific technical scheme:
an online comparison detection system of a power quality monitoring device comprises a signal acquisition module, a standard power quality monitoring device, a detected power quality monitoring device, a network switch and a detection host; the signal acquisition module is used for acquiring three-phase voltage and current signals of a monitoring point and inputting the acquired signals to a standard power quality monitoring device and a detected power quality monitoring device; the signal acquisition module is respectively connected with the standard power quality monitoring device and the detected power quality monitoring device; the standard power quality monitoring device and the detected power quality monitoring device are respectively connected with the network switch; the network switch is connected with the detection host.
Further, the standard electric energy quality monitoring device comprises a sampling unit, a microcontroller, an input/output unit, a storage unit and a power supply detection unit; the sampling unit is used for sampling a voltage signal and a current signal; the microcontroller is used for sampling control, sampling data calculation and analysis, network time synchronization, calculation and analysis data storage control and network communication control; the input and output unit is used for outputting a calculation analysis result; the storage unit is used for storing calculation analysis results; the power supply detection unit is used for providing power supply for the sampling unit, the microcontroller, the input/output unit and the storage unit; the sampling unit, the input and output unit, the storage unit and the power supply detection unit are respectively connected with the microcontroller.
Further, the input and output unit comprises an Ethernet interface, a USB interface, a serial port, a display, a key and a key indicator light.
Further, the detection host comprises a human-computer interaction module, a data acquisition module, an accuracy calculation module, a network time synchronization module and a detection report module; the human-computer interaction module is used for setting parameters, communication tests and chart display; the data acquisition module is used for acquiring the power quality index measurement result of the monitoring point signal from the standard power quality monitoring device and the detected power quality monitoring device; the accuracy calculation module is used for calculating the error between the power quality index measurement result of the monitoring point signal acquired from the detected power quality monitoring device and the power quality index measurement result of the monitoring point signal acquired from the standard power quality monitoring device, so as to judge whether the power quality index measurement result of the detected power quality monitoring device is qualified; the network time synchronization module is used for realizing the time synchronization of the standard power quality monitoring device and the detected power quality monitoring device for sampling monitoring point signals, so that the standard power quality monitoring device and the detected power quality monitoring device can sample the monitoring point signals at the same moment; the detection report module is used for generating, viewing and editing the detection report.
Further, the network time synchronization module adopts an IEEE1588 precision clock synchronization protocol to perform time synchronization on the standard power quality monitoring device and the detected power quality monitoring device, and the synchronization establishment time is less than 10 microseconds.
Further, the standard power quality monitoring device is at least one level higher than the accuracy of the detected power quality monitoring device.
The detection method of the online comparison detection system of the power quality monitoring device comprises the following steps:
(1) detection preparation: the signal acquisition module is respectively connected with a standard power quality monitoring device and a detected power quality monitoring device, the standard power quality monitoring device and the detected power quality monitoring device are respectively connected with a network switch, and the network switch is connected with a detection host;
(2) testing the integrity of the detection environment: testing whether the standard power quality monitoring device, the detected power quality monitoring device, the network switch, the detection host and the signal acquisition module are electrified normally or not; testing whether the communication between the standard power quality monitoring device and the detected power quality monitoring device and the detection host is normal or not; testing and detecting whether each functional module of the host works normally;
(3) network time setting: the network time synchronization module of the detection host machine is used for completing synchronous time synchronization work of the standard power quality monitoring device and the detected power quality monitoring device, so that the detection host machine, the standard power quality monitoring device and the detected power quality monitoring device keep time synchronization;
(4) and (3) calculating the accuracy: the data acquisition module acquires the power quality index measurement result of the monitoring point signal from the standard power quality monitoring device and the detected power quality monitoring device; the accuracy calculation module calculates the error between the power quality index measurement result of the monitoring point signal obtained from the detected power quality monitoring device and the power quality index measurement result of the monitoring point signal obtained from the standard power quality monitoring device, and judges whether the power quality index measurement result of the detected power quality monitoring device is qualified or not;
(5) outputting a detection result: the detection report module outputs a detection report.
The invention has the beneficial effects that: the invention provides an online comparison detection system of a power quality monitoring device, which compares the result of measuring the power quality index of a monitoring point signal by a standard power quality monitoring device with the result of measuring the power quality index of the monitoring point signal by a detected power quality monitoring device on line and calculates errors so as to judge whether the power quality index measurement result of the detected power quality monitoring device is qualified. Meanwhile, the detection method provided by the invention can automatically read the monitoring data from the standard power quality monitoring device and the detected power quality monitoring device, carry out error calculation and automatically output the detection result to the detection report, thereby greatly reducing the detection difficulty, ensuring the measurement accuracy of the detected power quality monitoring device on various power quality indexes, really putting the power quality technical supervision work to the real place and protecting the safety, stability and economic operation of the power grid.
Drawings
Fig. 1 is a schematic structural diagram of an on-line comparison detection system of a power quality monitoring device according to the present invention;
FIG. 2 is a schematic diagram of a standard power quality monitoring apparatus according to the present invention;
FIG. 3 is a schematic flow chart illustrating steps of a detection method of the online comparison detection system of the power quality monitoring device according to the present invention;
FIG. 4 is a schematic diagram of the tuning process of the present invention;
FIG. 5 is a schematic diagram of a clock synchronization process according to the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings in which:
as shown in fig. 1, an online comparison and detection system for a power quality monitoring device includes a signal acquisition module, a standard power quality monitoring device, a detected power quality monitoring device, a network switch, and a detection host; the signal acquisition module is used for acquiring three-phase voltage and current signals of a monitoring point and inputting the acquired signals to the standard power quality monitoring device and the detected power quality monitoring device through signal lines; the signal acquisition module is respectively connected with the standard power quality monitoring device and the detected power quality monitoring device; the standard power quality monitoring device and the detected power quality monitoring device are respectively connected with the network switch; the network switch is connected with the detection host. The signal acquisition module acquires signals of monitoring points through a high-precision current sensor HIOKI active probe CT 6700.
The standard electric energy quality monitoring device comprises a sampling unit, a microcontroller, an input/output unit, a storage unit and a power supply detection unit; the sampling unit is used for sampling 4 paths of voltage signals and 4 paths of current signals, and an AD7606 chip is specifically adopted; the microcontroller is used for sampling control, sampling data calculation and analysis, network time synchronization, calculation and analysis data storage control and network communication control, and particularly adopts a 32-bit dual-core high-performance microcontroller OMAPL138 which is designed based on a C674x Fixed/Floating-Point VLIW DSP + ARM926EJ-S dual core; the input and output unit is used for outputting calculation and analysis results and comprises an Ethernet interface, a USB interface, a serial port, a display, a key and a key indicator light; the storage unit is used for storing calculation and analysis results; the power supply detection unit is used for providing power supply for the sampling unit, the microcontroller, the input/output unit and the storage unit; the sampling unit, the input and output unit, the storage unit and the power supply detection unit are respectively connected with the microcontroller.
The standard power quality monitoring device is at least one level higher than the accuracy of the detected power quality monitoring device.
The signal acquisition module acquires three-phase current signals and three-phase voltage signals of a monitoring point (such as a transformer substation) by adopting a high-precision current sensor HIOKI active probe CT6700, then the acquired signals are respectively output to a standard electric energy quality monitoring device and a detected electric energy quality monitoring device through signal lines, the three-phase voltage and the three-phase current signals output by the signal acquisition module are sampled by the standard electric energy quality monitoring device and the detected electric energy quality monitoring device at the same moment through the signal lines, measurement data of various electric energy quality indexes are obtained through calculation processing in the device, and then the measurement data of the various electric energy quality indexes obtained by the standard electric energy quality monitoring device and the detected electric energy quality monitoring device are respectively transmitted to a detection host through Ethernet.
The detection host comprises a human-computer interaction module, a data acquisition module, an accuracy calculation module, a network time synchronization module and a detection report module; the man-machine interaction module is used for setting parameters, communication tests and chart display; the data acquisition module is used for acquiring the power quality index measurement result of the monitoring point signal from the standard power quality monitoring device and the detected power quality monitoring device; the accuracy calculation module is used for calculating the error between the power quality index measurement result of the monitoring point signal acquired from the detected power quality monitoring device and the power quality index measurement result of the monitoring point signal acquired from the standard power quality monitoring device, so as to judge whether the power quality index measurement result of the detected power quality monitoring device is qualified; the network time synchronization module is used for realizing the time synchronization of the standard power quality monitoring device and the detected power quality monitoring device for sampling the monitoring point signals, so that the standard power quality monitoring device and the detected power quality monitoring device can sample the monitoring point signals at the same moment, and the error calculation of the accuracy calculation module is guaranteed to have comparability; the detection report module is used for generating, viewing and editing the detection report.
The network time synchronization module adopts an IEEE1588 precision clock synchronization protocol to perform time synchronization on the standard power quality monitoring device and the detected power quality monitoring device, and the synchronization establishment time is less than 10 mu s.
The detection method of the online comparison detection system of the power quality monitoring device comprises the following steps:
(1) detection preparation: the signal acquisition module is respectively connected with a standard power quality monitoring device and a detected power quality monitoring device, the standard power quality monitoring device and the detected power quality monitoring device are respectively connected with a network switch, and the network switch is connected with a detection host; and if the connection of each part of the system is good, entering the next step of testing.
(2) Testing the integrity of the detection environment:
1) testing whether the standard power quality monitoring device, the detected power quality monitoring device, the network switch, the detection host and the signal acquisition module are electrified normally or not;
2) whether the communication between the standard power quality monitoring device and the detected power quality monitoring device and the detection host is normal or not is tested, and specifically, some common instructions (such as: ping, netstat, telnet, etc.) to test whether the communication link can be normally connected, and if the communication is abnormal, the man-machine interaction module gives the reason and prompt of the abnormality. Secondly, the data acquisition module respectively reads detection data (including real-time data, statistical data, waveform data and the like) of each power quality index of the standard power quality monitoring device and the detected power quality monitoring device in an online mode according to an IEC61850 communication protocol, so as to judge whether the communication protocols of the standard power quality monitoring device and the detected power quality monitoring device are consistent with the standard protocol and judge whether the acquired data are correct;
3) testing and detecting whether each functional module of the host works normally;
if any one of the tests fails, the human-computer interaction module gives reasons and prompts, and the next step is not carried out until the testers pass the treatment.
(3) Network time setting: the network time synchronization module of the detection host machine is used for completing synchronous time synchronization work of the standard power quality monitoring device and the detected power quality monitoring device, so that the detection host machine, the standard power quality monitoring device and the detected power quality monitoring device keep time synchronization, and monitoring data of the standard power quality monitoring device and the detected power quality monitoring device are compared; the network time synchronization module adopts an IEEE1588 precision clock synchronization protocol to perform precision (nanosecond) time synchronization on the standard power quality monitoring device and the detected power quality monitoring device, has higher time synchronization precision than the traditional NTP/SNTP network time protocol, and can enable the standard power quality monitoring device and the detected power quality monitoring device to perform monitoring point signal sampling at the same moment, thereby ensuring the comparability of the measurement results of the standard power quality monitoring device and the detected power quality monitoring device. The synchronization of the clocks of the IEEE1588 precision clock synchronization protocol is the process of realizing the clock synchronization at two ends by carrying out message interaction between a master clock and a slave clock. The method comprises the following specific steps:
1) taking a clock of the detection host as a master clock, and taking a clock of the standard power quality monitoring device or the detected power quality monitoring device as a slave clock;
2) tuning: as shown in fig. 4, the master clock periodically sends messages according to a sending period, and takes a certain frame of message as a starting message and sets the sending time as TM0Reception time of TS0Sending out time TM0Provided by a master clock and receiving a time T via link delay compensationS0The slave clock provides the time, and after a plurality of sending periods are separated, the sending time of the currently sent message is TMiReception time of TSiI is the number of transmission cycle intervals between the currently transmitted message and the starting point message, wherein i>0, adjusting the time change rate of the slave clock by the ratio of the master clock frequency to the slave clock frequency, i.e. the ratio of the master clock frequency to the slave clock frequency
(TMi-TM0)/(TSi-TS0)；
3) Calculating a time delay TdelayAnd a time offset Toffset：
(i) as shown in FIG. 5, at T1Sending a synchronization message at a time, recording the arrival time T of the synchronization message by a slave clock at the time2At this time, the slave clock end only has a time stamp T2；
Secondly, the following message sent next to the synchronous message carries the synchronous message sending time T1To the slave clock side, where the slave clock side has a time stamp T1And T2；
Thirdly, the slave clock sends a delay request message to the master clock, and records the sending time T of the delay request message at the slave clock end3At this time, the slave clock end has a time stamp T1、T2And T3；
Fourthly, the time T of the delayed request message reaching the master clock is finally obtained by the master clock end4Record that the delay response message carries the arrival time T of the delay request message4Sent to the slave clock and by the slaveTime T recorded by clock4At this time, the slave clock end has a time stamp T1、T2、T3And T4；
Fifthly, the whole time synchronization process is basically finished, however, T1And T4The time of day is measured by the time information of the master clock, and T2And T3The time is measured by the time information of the slave clock, if the time is measured by the standard of the master clock, T is2And T3In time with respect to T1And T4There is a time delay TdelayAnd a time offset ToffsetThe calculation expression is
T2-Toffset-Tdelay＝T1；
T3-Toffset+Tdelay＝T4；
The two formulas are arranged with
4) According to time delay TdelayAnd a time offset ToffsetThe slave clock is adjusted so that the slave clock is synchronized with the master clock.
(4) And (3) calculating the accuracy: the data acquisition module acquires power quality index measurement data and measurement results of monitoring point signals from a standard power quality monitoring device and a detected power quality monitoring device through IEC 61850; then, for each power quality index, the accuracy calculation module calculates the error between the power quality index measurement result of the monitoring point signal obtained from the detected power quality monitoring device and the power quality index measurement result of the monitoring point signal obtained from the standard power quality monitoring device at the same time point, and judges whether the power quality index measurement result of the detected power quality monitoring device is qualified or not according to the measurement error.
(5) Outputting a detection result: the detection report module outputs a detection report, and detection personnel can check, edit and upload the detection report through the detection report module.
The present invention is not limited to the above-described embodiments, which are merely preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. An online comparison detection method for a power quality monitoring device is characterized by comprising the following steps: the system comprises a signal acquisition module, a standard power quality monitoring device, a detected power quality monitoring device, a network switch and a detection host; the signal acquisition module is used for acquiring three-phase voltage and current signals of a monitoring point and inputting the acquired signals to a standard power quality monitoring device and a detected power quality monitoring device; the signal acquisition module is respectively connected with the standard power quality monitoring device and the detected power quality monitoring device; the standard power quality monitoring device and the detected power quality monitoring device are respectively connected with the network switch; the network switch is connected with the detection host; the detection host comprises a human-computer interaction module, a data acquisition module, an accuracy calculation module, a network time synchronization module and a detection report module; the human-computer interaction module is used for setting parameters, communication tests and chart display; the data acquisition module is used for acquiring the power quality index measurement result of the monitoring point signal from the standard power quality monitoring device and the detected power quality monitoring device; the accuracy calculation module is used for calculating the error between the power quality index measurement result of the monitoring point signal acquired from the detected power quality monitoring device and the power quality index measurement result of the monitoring point signal acquired from the standard power quality monitoring device, so as to judge whether the power quality index measurement result of the detected power quality monitoring device is qualified; the network time synchronization module is used for realizing the time synchronization of the standard power quality monitoring device and the detected power quality monitoring device for sampling monitoring point signals, so that the standard power quality monitoring device and the detected power quality monitoring device can sample the monitoring point signals at the same moment; the detection report module is used for generating, viewing and editing a detection report;
the network time synchronization module adopts an IEEE1588 precision clock synchronization protocol to perform time synchronization on the standard power quality monitoring device and the detected power quality monitoring device, and the synchronization establishment time is less than 10 mu s;
the detection method comprises the following steps:
(1) detection preparation: the signal acquisition module is respectively connected with a standard power quality monitoring device and a detected power quality monitoring device, the standard power quality monitoring device and the detected power quality monitoring device are respectively connected with a network switch, and the network switch is connected with a detection host;
(2) testing the integrity of the detection environment: testing whether the standard power quality monitoring device, the detected power quality monitoring device, the network switch, the detection host and the signal acquisition module are electrified normally or not; testing whether the communication between the standard power quality monitoring device and the detected power quality monitoring device and the detection host is normal or not; testing and detecting whether each functional module of the host works normally;
(3) network time setting: the network time synchronization module of the detection host machine is used for completing synchronous time synchronization work of the standard power quality monitoring device and the detected power quality monitoring device, so that the detection host machine, the standard power quality monitoring device and the detected power quality monitoring device keep time synchronization; the synchronization of the clocks of the IEEE1588 precision clock synchronization protocol is the process of realizing the clock synchronization at two ends by carrying out message interaction between a master clock and a slave clock; the method comprises the following specific steps:
1) taking a clock of the detection host as a master clock, and taking a clock of the standard power quality monitoring device or the detected power quality monitoring device as a slave clock;
2) tuning: the master clock periodically sends messages according to the sending period, takes a certain frame of message as a starting message and sets the sending time as TM0Reception time of TS0Sending out time TM0Supplied by a master clock and compensated for by a link delayReceiving time TS0The slave clock provides the time, and after a plurality of sending periods are separated, the sending time of the currently sent message is TMiReception time of TSiI is the number of transmission cycle intervals between the currently transmitted message and the starting point message, wherein i>0, adjusting the time change rate of the slave clock by the ratio of the master clock frequency to the slave clock frequency, namely (T)Mi-TM0)/(TSi-TS0)；
3) Calculating a time delay TdelayAnd a time offset Toffset：
At T1Sending a synchronization message at a time, recording the arrival time T of the synchronization message by a slave clock at the time2At this time, the slave clock end only has a time stamp T2；
Secondly, the following message sent next to the synchronous message carries the synchronous message sending time T1To the slave clock side, where the slave clock side has a time stamp T1And T2；
Thirdly, the slave clock sends a delay request message to the master clock, and records the sending time T of the delay request message at the slave clock end3At this time, the slave clock end has a time stamp T1、T2And T3；
Fourthly, the time T of the delayed request message reaching the master clock is finally obtained by the master clock end4Record that the delay response message carries the arrival time T of the delay request message4Sending to the slave clock and recording the time T by the slave clock4At this time, the slave clock end has a time stamp T1、T2、T3And T4；
Fifthly, the whole time synchronization process is basically finished, however, T1And T4The time of day is measured by the time information of the master clock, and T2And T3The time is measured by the time information of the slave clock, if the time is measured by the standard of the master clock, T is2And T3In time with respect to T1And T4There is a time delay TdelayAnd a time offset ToffsetMeter for measuringThe expression is
T2-Toffset-Tdelay＝T1；
T3-Toffset+Tdelay＝T4；
The two formulas are arranged with
4) According to time delay TdelayAnd a time offset ToffsetAdjusting the slave clock so that the slave clock is synchronized with the master clock;
(4) and (3) calculating the accuracy: the data acquisition module acquires the power quality index measurement result of the monitoring point signal from the standard power quality monitoring device and the detected power quality monitoring device; the accuracy calculation module calculates the error between the power quality index measurement result of the monitoring point signal obtained from the detected power quality monitoring device and the power quality index measurement result of the monitoring point signal obtained from the standard power quality monitoring device, and judges whether the power quality index measurement result of the detected power quality monitoring device is qualified or not;
(5) outputting a detection result: the detection report module outputs a detection report.
2. The online comparison detection method for the power quality monitoring device according to claim 1, characterized in that: the standard electric energy quality monitoring device comprises a sampling unit, a microcontroller, an input/output unit, a storage unit and a power supply detection unit; the sampling unit is used for sampling a voltage signal and a current signal; the microcontroller is used for sampling control, sampling data calculation and analysis, network time synchronization, calculation and analysis data storage control and network communication control; the input and output unit is used for outputting a calculation analysis result; the storage unit is used for storing calculation analysis results; the power supply detection unit is used for providing power supply for the sampling unit, the microcontroller, the input/output unit and the storage unit; the sampling unit, the input and output unit, the storage unit and the power supply detection unit are respectively connected with the microcontroller.
3. The online comparison detection method for the power quality monitoring device according to claim 2, characterized in that: the input and output unit comprises an Ethernet interface, a USB interface, a serial port, a display, a key and a key indicator lamp.
4. The online comparison detection method for the power quality monitoring device according to claim 1, characterized in that: the standard power quality monitoring device is at least one level higher than the precision of the detected power quality monitoring device.
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