CN116430292A - Broadband measurement active test method and system for power system - Google Patents
Broadband measurement active test method and system for power system Download PDFInfo
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Abstract
The invention provides an active test method and system for broadband measurement of a power system, wherein the method comprises the following steps: the broadband measurement master station transmits a broadband measurement test verification file to the broadband measurement device at the station end through an offline data frame; after the broadband measurement device receives the test verification file, the broadband measurement calculation is started at the test starting time by adopting waveform data in the test verification file, and the broadband measurement master station judges the data accuracy of the received test real-time data; judging whether the time of ending the test is reached, if not, returning to the step of carrying out broadband measurement calculation by adopting the waveform data in the test verification file; if so, the broadband measurement device ends the active test. The invention can respond to the data verification requirement of the power dispatching center in time, does not need to go to the site for operation by professionals of factories, has short time consumption, does not need to carry out works such as CT blocking and the like, does not need to apply for power failure, and greatly lightens the workload of verifying the data accuracy of the broadband measuring device.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an active test method and system for broadband measurement of a power system.
Background
With the large-scale grid connection of new energy, ultra-high voltage direct current transmission and rapid development of intelligent power grids, the novel power electronic equipment is being widely applied to various fields of power generation, transmission, transformation, distribution and power utilization of a power system instead of the traditional power equipment, and the power grids show obvious power electronization characteristics in various links of sources, networks and charges. The wide application of the power electronic equipment promotes the power grid resource optimal configuration capability, so that the renewable energy grid-connected control and operation are more flexible, the system rapid control capability is greatly enhanced, the mechanism characteristics and the operation control mode of the power system are changed, new safety and stability problems are brought, particularly the phenomena of low-frequency oscillation and subsynchronous/supersynchronous oscillation are increased increasingly, and the safety, stability and economic operation of the power system are greatly influenced. Therefore, in order to improve the dynamic stability monitoring and harmonic monitoring analysis capability, and provide data support for the functions of constructing fundamental wave phasors, harmonic wave phasor distribution, vibration source positioning, vibration conduction paths and the like for a real-time dynamic monitoring system of an electric power system, a broadband measuring device is required to be installed on a power supply grid-connected point and a line side with more prominent stability problems of important substations, power plants, photovoltaic power stations, wind power plants and the like. The broadband measurement system architecture of the power system is shown in fig. 1.
In fig. 1, the broadband measurement master station of the power system mainly refers to a computer system and software installed in each level of dispatching center, and is used for receiving and forwarding dynamic data of the substation and completing advanced application functions such as storage, management, analysis, alarm, decision making and the like. The broadband measurement station end device comprises a broadband measurement processing unit and a broadband measurement processing device. The broadband measurement processing unit is a device for receiving, storing and forwarding broadband measurement data at the station end, and can be connected with 8 broadband measurement processing devices at most. The broadband measurement processing device is a measurement, calculation and monitoring unit of the power grid signal, and can calculate and monitor harmonic components and inter-harmonic components within 0-2500Hz in real time and realize subsynchronous/supersynchronous oscillation alarming.
The data accuracy is the most important index for measuring the broadband measurement system. Therefore, before the broadband measuring device at the station end is put into operation, the data accuracy is checked with the power system dispatching center in a test mode. With the change of the operation condition after operation, if the data accuracy of the broadband measurement device needs to be confirmed again, two schemes are generally adopted for verification. One proposal is to apply for power failure, obtain approval from a dispatching center, and then check the accuracy of data with the dispatching center of the power system in a test mode. The scheme has the advantages that the data accuracy of the broadband measuring device can be completely verified from hardware to software, the scheme has the defects of long time consumption, manual checking of all intervals of each device, CT blocking and the like, great labor and material resources are consumed, a proper power failure window is required to be waited, and the data accuracy checking requirement of the master station cannot be responded timely. The other scheme is that the continuous wave recording file and the dynamic wave recording file in the device are obtained after a call center calls or a professional of a broadband measuring device manufacturer arrives at the site, and the consistency of the data of the two files in the same time is verified in an off-line mode, so that the accuracy of monitoring the data of the broadband measuring device is judged. The scheme has the advantages of short time consumption, no need of CT plugging, no need of consuming a great deal of manpower and material resources, and the disadvantage of offline analysis, and generally needs to be operated after a manufacturer professional arrives at the site.
Disclosure of Invention
The aim of the invention is achieved by the following technical scheme.
According to a first aspect of the present invention, there is provided an active test method for broadband measurement of an electric power system, comprising the steps of:
the broadband measurement master station transmits a broadband measurement test verification file to the broadband measurement device through an offline data frame;
after the broadband measurement device receives the broadband measurement test verification file, the broadband measurement calculation is carried out by adopting waveform data in the broadband measurement test verification file at the moment of starting the test, so as to obtain test real-time data and send the test real-time data to the broadband measurement master station;
the broadband measurement master station judges the data accuracy of the received test real-time data;
judging whether the time of ending the test is reached, if not, returning to the step of carrying out broadband measurement calculation by adopting the waveform data in the broadband measurement test verification file; if so, the broadband measurement device ends the active test.
Further, the test verification file includes a device under test identifier, a channel under test name, a test start time, a number of measured signal waveform points, test signal waveform data, and/or a file verification code.
Further, the broadband measurement master station and the broadband measurement device adopt a TCP link to transmit data, the broadband measurement master station is a TCP client, the broadband measurement device is a TCP server, and the offline data frame port is 9600; the broadband measurement master station transmits a broadband measurement test verification file to the broadband measurement device according to the following steps:
the broadband measurement master station actively links 9600 ports of the broadband measurement device, and after the link is established, the broadband measurement master station issues an active online test command of the broadband measurement device;
after receiving the active online test command, the broadband measurement device enters a state of receiving an active test waveform file, firstly records an active test starting time T1, the total data point number N of the test data waveform file, the number K of the test data waveform file and the number P of test data bytes contained in each frame of test data waveform file data frame issued by the master station, and secondly returns an active online test command to successfully receive a message to the broadband measurement master station;
and after the broadband measurement master station receives the message successfully received by the active online test command sent by the broadband measurement device, the broadband measurement master station issues a broadband measurement test verification file.
Further, the broadband measurement test verification file is generated by the master station according to a mathematical formula specified by various test models specified in QGDW10131-2017 electric power system real-time dynamic monitoring technical Specification.
Further, the mathematical formula is a data formula with harmonic and inter-harmonic signal components, as shown in formula 1:
f in 1 s For sampling frequency f 0 At the fundamental frequency f i For the frequencies of the respective subharmonic and inter-harmonic signal components,
is the fundamental wave signal initial phase angle, +.>
For the initial phase angle of each subsynchronous oscillation component, A is the amplitude of the fundamental wave, and delta A i And for the amplitude values of the signal components of each subharmonic and each inter-harmonic, k is the kth signal component, t is the moment point, and N is the number of data points in the broadband measurement test verification file.
Further, the broadband measurement master station judges whether the current real-time data is the active test uploading data calculated by the broadband measurement device according to the broadband measurement test verification file according to the preset flag bit of the received test real-time data, and if so, the data accuracy judgment is carried out.
Further, the data accuracy judgment comprises the following steps:
the broadband measurement master station compares and verifies the actual measurement value received by the broadband measurement device with the theoretical measurement value of the test waveform, and can verify the measurement accuracy of the broadband measurement device.
According to a second aspect of the present invention, there is provided a broadband measurement active test system for an electric power system, comprising:
a broadband measurement master station;
a broadband measurement device;
the broadband measurement master station and the broadband measurement device interact to execute the broadband measurement active test method according to the first aspect.
The invention has the advantages that: the invention is a real-time, online, quick, simple and feasible active verification test method for the accuracy of the broadband measurement data of the power system, can respond to the data verification requirement of the power dispatching center in time, does not need the professional personnel of a manufacturer to go to the site for operation, has short time consumption, does not need the work such as CT blocking and the like, does not need power failure application, greatly reduces the workload of the data accuracy verification of the broadband measurement device, and is a convenient and reliable active verification test scheme for the accuracy of the broadband measurement data of the power system.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 shows a prior art architecture diagram of a broadband measurement system.
FIG. 2 shows a basic flow chart of an active verification test for accuracy of broadband measurement data according to an embodiment of the invention.
FIG. 3 shows a schematic diagram of a calculation data source of a broadband measurement device according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Aiming at the problem that the on-line verification means of the measurement accuracy of the broadband measurement device which is put into operation on site is lost, the invention provides an active on-line test system and method for the broadband measurement accuracy of a power system, which comprises the following steps:
the invention provides a real-time and online active verification test method for the accuracy of broadband measurement data of a power system, and the basic flow of the method is shown in figure 2. The broadband measurement master station of the power dispatching center issues a broadband measurement test verification file to the broadband measurement device at the station end through an offline file pipeline, wherein the test verification file comprises information such as a tested device identifier, a tested channel name, a test starting time, a measurement signal waveform point number, test signal waveform data, a file verification code and the like, the broadband measurement device starts to conduct broadband measurement calculation by adopting waveform data in the test verification file at a test starting time after receiving the test verification file, and then switches back to device actual waveform data calculation after reaching a test ending time. The real-time phasor data frame status words sent by the broadband measurement device defined in the specification QGDW 12214-2022 technical Specification for broadband measurement devices of electric power systems, attached Table A.1, are expanded, and Bit09-07 is modified to be 0001: the data frame is designated as an active test upload data frame. Therefore, the 9 th to 7 th bit values in the real-time data frame sent to the dispatching broadband measurement master station by the broadband measurement device during the test are 0001, and the system software of the dispatching broadband measurement master station performs comparison and verification on the actual measured value of the received broadband measurement device and the theoretical measured value of the test waveform, so that the measurement accuracy of the broadband measurement device can be verified.
The broadband measurement master station and the station device adopt TCP link to transmit data, the broadband measurement master station is a TCP client, the station broadband measurement device is a TCP server, and the offline data frame port is 9600. The master station transmits test data verification files to the broadband measurement device of the station according to the following steps:
1. the station monitors the link of the master station at 9600 ports, the master station actively links the 9600 ports of the broadband measuring device of the station, and after the link is established, the master station issues an active online test command of the broadband measuring device. The definition of the active on-line test command message of the broadband measurement device is shown in table 1.
Table 1 definition of active on-line test command message frame for wideband measuring device
In the test data verification file issued by the master station, each test data point is a 16-bit signed integer, so that the value of the frame_num field in table 1 can be calculated according to the total number of test points contained in the test data waveform file and the number of bytes of each FRAME of data of the test data waveform file data FRAME issued by the master station, namely: k=n×2/P.
2. After receiving the command, a certain broadband measurement device identical to the message IDCODE in Table 1 enters a state of receiving an active test waveform file, firstly records and stores the active test starting time T1, the total data point number N of the test data waveform file, the test data waveform file frame number K, and the test data byte number P contained in each frame of test data waveform file data frame issued by the master station, and secondly returns the message successfully received by the active online test command to the broadband measurement master station. The format is shown in table 2.
Table 2 definition of the active Online test Command feedback message frame for wideband measurement apparatus
3. After the master station receives the successfully received active test command message sent by the wide-frequency measurement device in the factory station, a wide-frequency measurement test verification file, namely an active test waveform file, is issued according to the definition of the table 3.
Table 3 definition of active on-line test data frame for wideband measuring device
4. After receiving all the data frames, the wideband measuring device enters a data accuracy test mode according to the flow of fig. 2.
5. The test data waveform file can be generated by the master station according to a mathematical formula specified by various test models specified in QGDW10131-2017 electric power system real-time dynamic monitoring technical Specification. The invention exemplifies a data formula with harmonic and inter-harmonic signal components, as shown in formula 1:
f in 1 s For sampling frequency f 0 At the fundamental frequency f i For the frequencies of the respective subharmonic and inter-harmonic signal components,
is the fundamental wave signal initial phase angle, +.>
For the initial phase angle of each subsynchronous oscillation component, A is the amplitude of the fundamental wave, and delta A i For each subharmonic, inter-harmonic signal component amplitude, k is the kth signal component.
The master station generates a test waveform file of the designated test channel according to the mathematical expression:
a. the sampling rate of the broadband measurement device is 12800Hz, so f in formula 1 s The value is 12800Hz, f 0 The value is within the range of 45-55Hz, f i The range of the value of (2) is 5-6400Hz.
b. Since the range of data values of each point of the test signal waveform is-32768-32767, the fundamental wave amplitude A and the signal components delta A of each subharmonic and inter-harmonic i The sum should have a value ranging from-32768 to 32767.
c. N is the number of data points in the test file, typically taken as 12800, i.e. 1 second, of data to ensure that the file covers one complete cycle of all test signals. And recording the active test time corresponding to the N-point test data as T2.
6. In the time T2, the real-time data frame sent by the broadband measurement device to the scheduling broadband measurement master station is defined in table 4:
table 4 definition of real-time data frame for wideband measuring device
The invention makes an extended modification to STAT, the original definition of which is as in table 5:
table 5 definition of real-time data frame STAT field for wideband measuring device
Bits 09-07 of the status word are defined as 001, which indicates that the real-time data frame sent by the broadband measurement device in the test period is an active test uploading data frame. And the master station judges whether the current real-time data is the active test uploading data calculated by the station according to the test waveform file according to the flag bit. In the active test mode, the master station should perform error comparison and verification on the theoretical data obtained according to the formula 1 and the actual measurement value uploaded by the broadband measurement device of the station, so that the whole active test process is completed. The data accuracy standard should refer to relevant regulations in QGDW 12214-2022 technical Specification for broadband measurement devices of electric power systems and QGDW10131-2017 technical Specification for real-time dynamic monitoring of electric power systems. Taking fundamental wave voltage and current phasor measurement accuracy as an example, the phasor data calculated by the broadband measurement device according to the test file issued by the master station and the theoretical phasor data error obtained according to the formula 1 should satisfy the following two table definitions.
TABLE 6 fundamental Voltage phasor measurement accuracy requirement
TABLE 7 fundamental current phasor measurement accuracy requirement
In the test period T, when the broadband measurement device calculates, the actual value acquired by the AD is not adopted, the test waveform file data issued by the main station is adopted, and the calculated dynamic real-time data is uploaded to the main station according to the synchronous phasor, harmonic wave and harmonic wave calculation in the device, as shown in figure 3, the synchronous phasor calculation in the broadband measurement device comprises amplitude, phase angle, fundamental wave frequency, frequency change rate, power and the like; harmonic monitoring includes amplitude, phase angle, etc. of each subharmonic. Since the functions of data acquisition, calculation and the like in the broadband measurement device belong to the current common knowledge in the field, the functions do not belong to the invention points in the field, and are not repeated here.
Specific examples:
the method is characterized in that the data accuracy of the broadband measuring device is checked aiming at the broadband of a certain wind farm in inner Mongolia, the primary rated value of a voltage channel is 220kV, and the primary rated value of a current channel is 600A. Taking voltage channel data accuracy verification as an example, the implementation steps are as follows:
(1) A waveform containing fundamental wave, 2, 10 times harmonic wave components and 70Hz inter-harmonic wave components is generated according to the following formula, wherein 16384 corresponds to 220kV,2, 10 times harmonic wave components and the amplitude of the 70Hz inter-harmonic wave components is 5% of the fundamental wave components. The number of waveform points is 12800 points, namely a test waveform of 1 second.
X(t)＝16384*cos(2*π*50*t+0)+1638.4*cos(2*π*100*t+0)+163*
cos(2*π*500*t+0)+819.2*
cos(2*π*70*t+0) (2)
According to this formula, the theoretical amplitude of the fundamental wave should be 16384 and the phase angle 0 degrees. The theoretical amplitude of the 2 nd and 10 th harmonics should be 1638.4 and the phase angle 0 degrees. The theoretical amplitude of the harmonic component between 70Hz should be 819.2 and the phase angle 0 degrees.
(2) The broadband measurement master station issues a test signal data accuracy check file through an offline file transmission pipeline, the offline file is assigned with a device name to be tested as IDCODE01, a channel name to be tested as 220# bus, N as 12800, start time as 1681982341 (2023-04-20:8:19:01.0) and end time as 1681982342 (2023-04-20:19:02.0).
(3) After receiving the data accuracy check file, the broadband measurement device with the device name of IDCODE01 extracts the test start time, the test end time and the test waveform data.
(4) The broadband measurement device judges whether the test start time 1681982341 is reached, and if so, enters a test mode: the broadband measurement device sends the real-time data frame of the dispatching broadband measurement master station to the test mark position 1, meanwhile, the actual AD sampling value of the device is replaced by test waveform data, calculation is carried out, the calculated dynamic real-time data is uploaded to the master station, in the calculated real-time data, the fundamental wave amplitude of a test channel is 220kV, the 2-order harmonic amplitude is 22kV, the 10-order harmonic amplitude is 22kV, and the inter-70 Hz harmonic amplitude is 22kV.
(5) The master station judges the accuracy of the fundamental wave amplitude, the 2 nd harmonic amplitude, the 10 th harmonic amplitude and the harmonic amplitude between 70Hz of the test channel, and if the fundamental wave amplitude, the 10 th harmonic amplitude and the theoretical value of the formula 1 are inconsistent, the monitoring data of the broadband measuring device are considered to be inaccurate, and further subsequent processing is performed.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The broadband measurement active test method for the electric power system is characterized by comprising the following steps of:
the broadband measurement master station transmits a broadband measurement test verification file to the broadband measurement device through an offline data frame;
after the broadband measurement device receives the broadband measurement test verification file, the broadband measurement calculation is carried out by adopting waveform data in the broadband measurement test verification file at the moment of starting the test, so as to obtain test real-time data and send the test real-time data to the broadband measurement master station;
the broadband measurement master station judges the data accuracy of the received test real-time data;
judging whether the time of ending the test is reached, if not, returning to the step of carrying out broadband measurement calculation by adopting the waveform data in the broadband measurement test verification file; if so, the broadband measurement device ends the active test.
2. The method of claim 1, wherein,
the test verification file comprises a tested device identifier, a tested channel name, a test starting time, a measurement signal waveform point number, test signal waveform data and/or a file verification code.
3. A broadband measurement active test method for an electrical power system according to claim 1 or 2, wherein,
the broadband measurement master station and the broadband measurement device adopt TCP link to transmit data, the broadband measurement master station is a TCP client, the broadband measurement device is a TCP server, and the offline data frame port is 9600; the broadband measurement master station transmits a broadband measurement test verification file to the broadband measurement device according to the following steps:
the broadband measurement master station actively links 9600 ports of the broadband measurement device, and after the link is established, the broadband measurement master station issues an active online test command of the broadband measurement device;
after receiving the active online test command, the broadband measurement device enters a state of receiving an active test waveform file, firstly records an active test starting time T1, the total data point number N of the test data waveform file, the number K of the test data waveform file and the number P of test data bytes contained in each frame of test data waveform file data frame issued by the master station, and then returns an active online test command to successfully receive a message to the broadband measurement master station;
and after the broadband measurement master station receives the message successfully received by the active online test command sent by the broadband measurement device, the broadband measurement master station issues a broadband measurement test verification file.
4. A broadband measurement active test method for an electrical power system according to claim 1 or 2, wherein,
the broadband measurement test verification file is generated by a master station according to a mathematical formula specified by various test models specified in QGDW10131-2017 electric power system real-time dynamic monitoring technical Specification.
5. The method of claim 4, wherein,
the mathematical formula is a data formula with harmonic and inter-harmonic signal components, as shown in formula 1:
f in 1 s For sampling frequency f 0 At the fundamental frequency f i For the frequencies of the respective subharmonic and inter-harmonic signal components,
is the fundamental wave signal initial phase angle, +.>
For the initial phase angle of each subsynchronous oscillation component, A is the amplitude of the fundamental wave, and delta A i And for the amplitude values of the signal components of each subharmonic and each inter-harmonic, k is the kth signal component, t is the moment point, and N is the number of data points in the broadband measurement test verification file.
6. The method of claim 1, wherein,
and the broadband measurement master station judges whether the current real-time data is the active test uploading data calculated by the broadband measurement device according to the broadband measurement test verification file according to the preset flag bit of the received test real-time data, and if so, judges the data accuracy.
7. The method of claim 6, wherein,
the data accuracy judgment method comprises the following steps:
the broadband measurement master station compares and verifies the actual measurement value received by the broadband measurement device with the theoretical measurement value of the test waveform, and can verify the measurement accuracy of the broadband measurement device.
8. A broadband measurement active test system for an electrical power system, comprising:
a broadband measurement master station;
a broadband measurement device;
the broadband measurement master station interacts with the broadband measurement device to perform the broadband measurement active test method according to any one of claims 1-7.
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