CN114024320A - Method, system and storage medium for measuring power and phase angle of safety and stability control device - Google Patents

Method, system and storage medium for measuring power and phase angle of safety and stability control device Download PDF

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CN114024320A
CN114024320A CN202111160026.9A CN202111160026A CN114024320A CN 114024320 A CN114024320 A CN 114024320A CN 202111160026 A CN202111160026 A CN 202111160026A CN 114024320 A CN114024320 A CN 114024320A
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loop
current
phase angle
voltage
obtaining
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CN114024320B (en
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任建锋
李祝昆
韩伟
马玉龙
刘东洋
陶翔
宋闯
朱传宏
李明应
王娟
张爱琴
孙玉军
陈永华
颜云松
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State Grid Corp of China SGCC
State Grid Henan Electric Power Co Ltd
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Nari Technology Co Ltd
State Grid Electric Power Research Institute
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State Grid Corp of China SGCC
State Grid Henan Electric Power Co Ltd
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Nari Technology Co Ltd
State Grid Electric Power Research Institute
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The invention discloses a method for measuring power and phase angle of a safety and stability control device, which comprises the following steps: acquiring a phase deviation value of an analog quantity initial phase angle of an element loop in the safety and stability control device compared with a calibration voltage; obtaining a time deviation value according to the phase deviation value; acquiring a time interval between two adjacent sampling points under the current frequency and the rated frequency; obtaining a resampling sequence of the element loop according to the time deviation value and the time interval between two adjacent sampling points under the current frequency and the rated frequency; according to the method, the power and the phase angle of the stabilizing device are obtained according to the resampling sequence, and the method corrects the angle difference caused by hardware through software compensation, so that the measurement precision of the power and the phase angle is improved, and support is provided for lean control.

Description

Method, system and storage medium for measuring power and phase angle of safety and stability control device
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and particularly relates to a method and a system for measuring power and phase angles of a safety and stability control device and a storage medium.
Background
In safety and stability control of an electric power system, alternating current power (hereinafter referred to as power) is often used for stability control of areas such as cutting machine load cutting and the like, and a phase angle is used for out-of-step separation control. In the area stability control, the identification of the system operation mode, the switching judgment of the strategy element, the power instantaneous quantity during the fault, the power control quantity in the control measure and the like all depend on the accurate calculation of the power. For example, after a certain power transmission section is disconnected, the load control of the receiving end switching needs to be performed, the established control strategy is to perform minimum over-switching control according to the power value before the accident, and if the error of the power calculation link is negative, the possibility of over-switching a control object exists. The out-of-step disconnection control criterion based on the phase angle is to judge whether the system enters an out-of-step operation state according to the passing tracks of the phase angle in four quadrants. In summary, accurate measurement of power and phase angle is important for safe and stable control of power system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for measuring the power and the phase angle of a safety and stability control device, which can accurately measure the power and the phase angle of the safety and stability control device.
The technical problem to be solved by the invention is realized by the following technical scheme:
in a first aspect, a method for measuring power and phase angle of a safety and stability control device is provided, which includes:
acquiring a phase deviation value of an initial phase angle of an analog quantity of an element loop in the safety and stability control device compared with an initial phase angle of a calibration voltage;
obtaining a time deviation value according to the phase deviation value;
acquiring a time interval between two adjacent sampling points under the current frequency and the rated frequency;
obtaining a resampling sequence of the element loop according to the time deviation value and the time interval;
and obtaining the power and the phase angle of the element in the stabilizing device according to the resampling sequence.
With reference to the first aspect, further, the process of obtaining the phase deviation value of the initial phase angle of the analog quantity of the element loop in the safety and stability control device compared with the initial phase angle of the calibration voltage includes:
the method comprises the steps of inputting rated voltage and rated current to a voltage loop and a current loop of an element in a safety and stability control device through a relay protection instrument, inputting rated voltage to a calibration voltage loop, calculating phase differences of all voltage and current loop analog quantities output by the relay protection instrument to be 0 degrees point by point through a Fourier algorithm to obtain the voltage and current of the element and an initial phase angle of the current cycle of the calibration voltage loop, and finding out phase deviation values of the initial phase angle of the voltage and current cycle of the element and the initial phase angle of the current cycle of the calibration voltage.
With reference to the first aspect, further, the obtaining the time offset value according to the phase offset value includes:
the time deviation value is obtained by the following formula
Figure BDA0003289688020000021
wherein ,VmComparing the initial phase angle of the analog quantity of the mth loop of the element with the initial phase angle phase deviation value, delta t, of the calibration voltagebmTime deviation value f of analog quantity initial phase angle of mth loop of element compared with phase of calibration voltage0Is the nominal frequency.
With reference to the first aspect, further, the obtaining a time interval between two adjacent sampling points at the current frequency and the rated frequency includes:
obtaining the time interval between two adjacent sampling points under the current frequency according to the formula (2)
Figure BDA0003289688020000022
Where f is the current frequency, N0The number of sampling points in a cycle, Ts' is the time interval between two adjacent sampling points at the current frequency;
obtaining the time interval between two adjacent sampling points under the rated frequency according to the formula (3);
Figure BDA0003289688020000023
wherein ,f0Is the nominal frequency.
With reference to the first aspect, further, the obtaining a resampling sequence of the component loop according to the time offset value and the time interval between two adjacent sampling points at the current frequency and the rated frequency includes:
calculating values for all loops of the element
Figure BDA0003289688020000024
Wherein m is equal to [1, n ]]，j∈[0,N-1]M is the loop serial number, N is the maximum value of the analog quantity loop serial number contained in the element, j is the number of sampling points for starting to back off at the current sampling point, and N is the number of points needing to be re-sampled;
will wm,jThe integer part of (A) is denoted as Pm,jThe decimal part is denoted by km,jThe mth loop is backed off from the current time by Pm,jTsThe voltage and current values at the original sampling point of time are recorded as
Figure BDA0003289688020000025
The mth loop moves back (P) from the current timem,j+1)TsThe voltage and current values at the original sampling point of time are recorded as
Figure BDA0003289688020000026
The mth loop moves back (P) from the current timem,j+2)T sThe voltage and current values at the original sampling point of time are recorded as
Figure BDA0003289688020000027
The mth loop moves back jT from the current timesValue of' resample point of time
Figure BDA0003289688020000031
And (4) resampling all loops of the element by N points according to the formula (4) to obtain a resampling sequence.
With reference to the first aspect, further, the obtaining the power and the phase angle of the stabilizing device according to the resampling sequence includes:
the serial numbers of the loops of the three-phase voltage are respectively used as ua、ub、ucIndicating that the loop serial numbers of the three-phase currents are respectively the loop serial numbers of the three-phase voltages, and obtaining the active power according to the formula (5)
Figure BDA0003289688020000032
Obtaining reactive power according to equation (6)
Figure BDA0003289688020000033
Obtaining the phase angle according to equation (7)
Figure BDA0003289688020000034
In a second aspect, a power and phase angle measurement system for a safety and stability control device is provided, which includes:
the deviation acquisition module is used for acquiring a phase deviation value of an initial phase angle of an analog quantity of an element loop in the safety and stability control device compared with an initial phase angle of the calibration voltage;
obtaining a time deviation value according to the phase deviation value;
the resampling module is used for acquiring the time interval between two adjacent sampling points under the current frequency and the rated frequency;
obtaining a resampling sequence of the element loop according to the time deviation value and the time interval between two adjacent sampling points under the current frequency and the rated frequency;
and the power and phase angle calculation module is used for obtaining the power and phase angle of the element in the stabilizing device according to the resampling sequence.
With reference to the second aspect, further, the deviation obtaining module includes:
the phase deviation value acquisition module is used for inputting rated voltage and rated current to the voltage and current loops of elements in the safety and stability control device through the relay protection instrument, phase differences of all voltage and current loop analog quantities output by the relay protection instrument are 0 degrees, calculating point by point through a Fourier algorithm to obtain the voltage and current of the elements and the initial phase angle of the current cycle of the calibration voltage loop, and finding out the phase deviation values of the initial phase angle of the voltage and current cycle of the current cycle of the current cycle of the current voltage and the initial phase angle of the current cycle of the calibration voltage;
a time deviation value obtaining module for obtaining the time deviation value by adopting the following formula
Figure BDA0003289688020000035
wherein ,VmComparing the initial phase angle of the analog quantity of the mth loop of the element with the initial phase angle phase deviation value, delta t, of the calibration voltagebmTime deviation value f representing the phase of the analog quantity initial phase angle of the mth loop of the element compared with the phase of the calibration voltage0Is the nominal frequency.
With reference to the second aspect, further, the obtaining, by the resampling module, a resampling sequence of the component loop according to the time offset value and a time interval between two adjacent sampling points at the current frequency and the rated frequency includes:
calculating values for all loops of the element
Figure BDA0003289688020000041
Wherein m is equal to [1, n ]]，j∈[0,N-1]M is the loop serial number, j is the number of sampling points for the current sampling point to start to back off,n is the number of points needing resampling;
will wm,jThe integer part of (A) is denoted as Pm,jThe decimal part is denoted by km,jThe mth loop is backed off from the current time by Pm,jTsThe voltage and current values at the original sampling point of time are recorded as
Figure BDA0003289688020000042
The mth loop moves back jT from the current timesValue of' resample point of time
Figure BDA0003289688020000043
And (4) resampling all loops of the element by N points according to the formula (4) to obtain a resampling sequence.
With reference to the second aspect, the power and phase angle calculation module further includes:
an active power calculation module for obtaining active power by the formula (5)
Figure BDA0003289688020000044
A reactive power calculation module for obtaining the reactive power by the formula (6)
Figure BDA0003289688020000045
A phase angle calculation module for obtaining the phase angle by the formula (7)
Figure BDA0003289688020000046
wherein ,ua、ub、ucThe number of the three-phase voltage loop and the number of the three-phase current loop are respectively represented by ia、ib、icAnd (4) showing.
The beneficial effects of the invention include: according to the method, the phase deviation value of the initial phase angle of the analog quantity of the element loop in the safety and stability control device is obtained compared with the initial phase angle of the calibration voltage, the time deviation value is obtained according to the phase deviation value, the resampling sequence of the element loop is obtained according to the time deviation value and the time interval between two adjacent sampling points under the current frequency and the rated frequency, and finally the power and the phase angle of the element in the stability device are obtained according to the resampling sequence, so that the compensation of the phase shift of the conditioning circuit on the voltage and current acquisition loop based on the calibration voltage is realized, the measurement precision of the power and the phase angle of the element is improved, and the support is provided for the subsequent lean control.
Drawings
FIG. 1 is a schematic diagram of the backoff difference in the present invention;
fig. 2 is a schematic diagram of the position of a resampling point when j is 0,1,2 in the present invention;
FIG. 3a is a schematic diagram of the voltage signal entering AD for collection under normal conditions in the present invention;
FIG. 3b is a schematic diagram of the current signal entering the AD for collection under normal conditions in the present invention;
FIG. 3c is a schematic diagram of the calibration voltage signal entering the AD for acquisition in the present invention;
fig. 4 is a flow chart of the present invention.
Detailed Description
To further describe the technical features and effects of the present invention, the present invention will be further described with reference to the accompanying drawings and detailed description.
The measurement errors of the power and the phase angle mainly come from two aspects of software and hardware. The software aspect mainly includes factors such as algorithm selection, truncation error and the like; the hardware is mainly the factors of the mutual inductor, the acquisition conditioning circuit component and the like. The invention mainly focuses on errors caused by hardware and an error compensation method, and the errors caused by the hardware generally comprise a specific difference and an angle difference. The ratio difference can be adjusted through simple proportional control, so that the default ratio difference is adjusted by other links, the problem of the angle difference caused by hardware is emphasized, the measurement precision of power and a phase angle is improved, and support is provided for lean control.
Example 1
As shown in fig. 1 to 3c, in order to implement the method, a voltage calibration input channel is additionally provided on an ac signal acquisition board of a conventional safety and stability control device, as shown in fig. 3c, the channel acquires a voltage signal without using a transformer, but rather, the voltage signal is divided by using a high-precision linear resistor and then enters an AD, and the principle of acquiring the voltage signal and the current signal in the AD under normal conditions is shown in fig. 3a and 3 b.
As shown in fig. 4, the method mainly includes the following steps:
step one, obtaining a phase deviation value of an initial phase angle of an analog quantity of an element loop in the safety and stability control device compared with an initial phase angle of a calibration voltage.
Suppose the system is rated for frequency f0Is 50Hz, the current frequency f of the system is 51Hz, and the wave samples N are taken every week0Is 24 points. The ratio difference is already adjusted in other links.
Rated voltage and rated current are input into a relevant voltage and a current loop of a certain element (a line or a transformer and the like) on a safety and stability control device through a relay protection tester, phase differences are all 0 degrees, rated voltage is output to a calibration voltage input channel on an alternating current signal acquisition board at the same time, the phase difference is 0 degree, a primary phase angle of analog quantity (current and voltage) is obtained through a Fourier algorithm, a voltage calibration input channel on the alternating current signal acquisition board is selected as reference voltage, and phase angle phase deviation values of the analog quantity primary phase angle and the calibration voltage of all relevant loops of the element are calculated.
The details are as follows:
measuring rated three-phase voltage Ua、Ub、Uc(the loop numbers thereof are each ua、ub、ucExpressed by), rated three-phase current Ia、Ib、Ic(the loop numbers thereof are represented by ia、ib、icExpressed) relative to the voltage on the ac signal acquisition board the input loop phase offset is calibrated to be:
Figure BDA0003289688020000061
and step two, obtaining a time deviation value according to the phase deviation value.
The time deviation value is obtained by the following formula
Figure BDA0003289688020000062
wherein ,VmThe phase deviation value delta t of the analog quantity initial phase angle of the mth loop of the element compared with the calibration voltagebmTime deviation value f of analog quantity initial phase angle of mth loop of element compared with phase of calibration voltage0Is the nominal frequency.
And step three, acquiring the time interval between two adjacent sampling points under the current frequency and the rated frequency.
According to the number N of sampling points per cycle preset by the device0And calculating the current frequency value f given by the frequency measurement module according to the formula (2) to obtain the time interval between two adjacent sampling points under the current frequency
Figure BDA0003289688020000063
Obtaining the time interval between two adjacent sampling points under the rated frequency according to the formula (3);
Figure BDA0003289688020000064
the specific results are as follows:
Figure BDA0003289688020000065
obtaining T according to the formula (2)s' 816.993 μ s, and T is obtained according to the formula (3)s＝833.333μs。
Step four, obtaining a resampling sequence of the element loop according to the time deviation value and the time interval between two adjacent sampling points under the current frequency and the rated frequency;
calculating values for all loops of the element
Figure BDA0003289688020000071
Wherein m is equal to [1, n ]]，j∈[0,N-1]M is the loop serial number, j is the number of sampling points for starting to back off the current sampling point, and N is the number of points needing to be re-sampled;
as shown in FIG. 1, let wm,jThe integer part of (A) is denoted as Pm,jThe decimal part is denoted by km,jThe mth loop is backed off from the current time by Pm,jTsThe voltage and current values at the original sampling point of time are recorded as
Figure BDA0003289688020000072
The mth loop moves back (P) from the current timem,j+1)TsThe value of the original sample point in time is recorded as
Figure BDA0003289688020000073
The mth loop moves back (P) from the current timem,j+2)TsThe value of the original sample point in time is recorded as
Figure BDA0003289688020000074
The mth loop moves back jT from the current timesValue of' resample point of time
Figure BDA0003289688020000075
And (4) resampling all loops of the element by N points according to the formula (4) to obtain a resampling sequence.
At voltage U of A phaseaFor example, when j is 0,
Figure BDA0003289688020000076
when the j is equal to 1, the total weight of the alloy is less than 1,
Figure BDA0003289688020000077
when the j is equal to 2, the total weight of the alloy is less than or equal to 2,
Figure BDA0003289688020000078
and (5) calculating in sequence.
As shown in fig. 2, the resample points at j 0,1,2 are calculated, and the values of the resample points at j 3, 4.
And step five, obtaining the power and the phase angle of the stabilizing device according to the resampling sequence.
The serial numbers of the loops of the three-phase voltage are respectively used as ua、ub、ucIndicating that the loop serial numbers of the three-phase currents are respectively the loop serial numbers of the three-phase voltages, and obtaining the active power according to the formula (5)
Figure BDA0003289688020000079
Obtaining reactive power according to equation (6)
Figure BDA00032896880200000710
Obtaining the phase angle according to equation (7)
Figure BDA00032896880200000711
The active power, the reactive power and the phase angle are compared with the actual measurement results as shown in the following table:
conventional methods The method of the invention
Maximum value of active power relative error 0.02％ 0.005％
Maximum value of relative error of reactive power -1.62％ -0.02％
Maximum absolute error of phase angle -0.5° -0.005°
When the deviation dispersion of the components is large, the phase shift caused by the conditioning circuit on the voltage and current acquisition loop is inconsistent, and the invention can compensate the situation, a calibration voltage channel is added on an alternating current signal acquisition board of the safety and stability control device, the phase deviation value of the initial phase angle of the analog quantity of the component loop in the safety and stability control device compared with the initial phase angle of the calibration voltage is obtained by obtaining the phase deviation value, then the time deviation value is obtained according to the phase deviation value, the resampling sequence of the component loop is obtained according to the time deviation value and the time interval between two adjacent sampling points under the current frequency and the rated frequency, finally the power and the phase angle of the component in the stability control device are obtained according to the resampling sequence, the compensation of the phase shift of the conditioning circuit on the voltage and current acquisition loop based on the calibration voltage is realized, and the measurement precision of the power and the phase angle of the components is improved, providing support for subsequent lean control.
Example 2
Also provided is a system for measuring power and phase angle of a safety and stability control device, comprising:
the deviation acquisition module is used for acquiring a phase deviation value of an initial phase angle of an analog quantity of an element loop in the safety and stability control device compared with an initial phase angle of the calibration voltage;
obtaining a time deviation value according to the phase deviation value;
the resampling module is used for acquiring the time interval between two adjacent sampling points under the current frequency and the rated frequency;
obtaining a resampling sequence of the element loop according to the time deviation value and the time interval between two adjacent sampling points under the current frequency and the rated frequency;
and the power and phase angle calculation module is used for obtaining the power and phase angle of the element in the stabilizing device according to the resampling sequence.
The deviation acquisition module comprises:
the phase deviation value acquisition module is used for inputting rated voltage and rated current to a voltage circuit and a current circuit of an element in the safety and stability control device, initial phase angles are all zero degrees, the initial phase angles of the current and the voltage are obtained through a Fourier algorithm, and initial phase angle phase deviation values of the initial phase angles and the calibration voltage are found out;
a time deviation value obtaining module for obtaining the time deviation value by adopting the following formula
Figure BDA0003289688020000081
wherein ,VmThe phase deviation value delta t of the analog quantity initial phase angle of the mth loop of the element compared with the calibration voltagebmTime deviation value f representing the phase of the analog quantity initial phase angle of the mth loop of the element compared with the phase of the calibration voltage0Is the nominal frequency.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (12)

1. A method for measuring power and phase angles of a safety and stability control device is characterized by comprising the following steps:
acquiring a phase deviation value of an analog quantity initial phase angle of an element loop in the safety and stability control device compared with an initial phase angle of a calibration voltage;
obtaining a time deviation value according to the phase deviation value;
acquiring a time interval between two adjacent sampling points under the current frequency and the rated frequency;
obtaining a resampling sequence of the element loop according to the time deviation value and the time interval;
and obtaining the power and the phase angle of the element in the safety and stability control device according to the resampling sequence.
2. The method for measuring power and phase angle of a safety and stability control device according to claim 1, wherein the obtaining of the initial phase angle of the analog quantity of the component loop of the safety and stability control device compared with the initial phase angle deviation value of the calibration voltage comprises:
rated voltage and rated current are input into a voltage loop and a current loop of an element in the safety and stability control device through a relay protection instrument, rated voltage is input into a calibration voltage loop, phase differences of all voltage and current loop analog quantities output by the relay protection instrument are 0 degrees, the voltage and the current of the element and the initial phase angle of the current cycle of the calibration voltage loop are calculated point by point through a Fourier algorithm, and phase deviation values of the initial phase angle of the voltage and the current cycle of the element and the initial phase angle of the current cycle of the calibration voltage are found out.
3. The method for measuring power and phase angle of a safety and stability control device according to claim 1, wherein the obtaining the time deviation value according to the phase deviation value comprises:
obtaining a time deviation value by using the formula (1)
Figure FDA0003289688010000011
wherein ,VmComparing the initial phase angle of the analog quantity of the mth loop of the element with the calibrationPhase deviation value of quasi-voltage, Δ tbmTime deviation value f representing the phase of the analog quantity of the mth loop of the element compared with the phase of the calibration voltage0Is the nominal frequency.
4. The method for measuring the power and phase angle of the safety and stability control device according to claim 1, wherein the step of obtaining the time interval between two adjacent sampling points at the current frequency and the rated frequency comprises:
obtaining the time interval between two adjacent sampling points under the current frequency according to the formula (2)
Figure FDA0003289688010000012
Where f is the current frequency, N0The number of sampling points in a cycle, Ts' is the time interval between two adjacent sampling points at the current frequency;
obtaining the time interval between two adjacent sampling points under the rated frequency according to the formula (3);
Figure FDA0003289688010000021
wherein ,f0Is the nominal frequency.
5. The method as claimed in claim 4, wherein the obtaining of the resampling sequence of the component loop according to the time deviation value and the time interval between two adjacent sampling points at the current frequency and the rated frequency comprises:
calculating values for all loops of the element
Figure FDA0003289688010000022
Wherein m is equal to [1, n ]]，j∈[0,N-1]M is the serial number of the loop, n is the maximum value of the analog loop serial number contained in the element, j is the current sampling pointThe number of sampling points withdrawn, N being the number of points to be resampled, Δ tbmThe time deviation value of the analog quantity phase of the mth loop of the element compared with the phase of the calibration voltage is represented;
will wm,jThe integer part of (A) is denoted as Pm,jThe decimal part is denoted by km,jThe mth loop is backed off from the current time by Pm,jTsThe voltage and current values at the original sampling point of time are recorded as
Figure FDA0003289688010000023
The mth loop moves back (P) from the current timem,j+1)TsThe voltage and current values at the original sampling point of time are recorded as
Figure FDA0003289688010000024
The mth loop moves back (P) from the current timem,j+2)TsThe voltage and current values at the original sampling point of time are recorded as
Figure FDA0003289688010000025
The mth loop moves back jT from the current timesValue of' resample point of time
Figure FDA0003289688010000026
And (4) resampling all loops of the element by N points according to the formula (4) to obtain a resampling sequence.
6. The method for measuring the power and phase angle of the safety and stability control device according to claim 5, wherein the obtaining the power and phase angle of the stability device according to the resampling sequence comprises:
the serial numbers of the loops of the three-phase voltage are respectively used as ua、ub、ucIndicating that the loop serial numbers of the three-phase currents are respectively the loop serial numbers of the three-phase voltages, and obtaining the active power according to the formula (5)
Figure FDA0003289688010000027
Obtaining reactive power according to equation (6)
Figure FDA0003289688010000028
Obtaining the phase angle according to equation (7)
Figure FDA0003289688010000031
7. A power and phase angle measuring system of a safety and stability control device is characterized by comprising:
the deviation acquisition module is used for acquiring a phase deviation value of an analog quantity initial phase angle of an element loop in the safety and stability control device compared with a calibration voltage initial phase angle;
obtaining a time deviation value according to the phase deviation value;
the resampling module is used for acquiring the time interval between two adjacent sampling points under the current frequency and the rated frequency;
obtaining a resampling sequence of the element loop according to the time deviation value and the time interval;
and the power and phase angle calculation module is used for obtaining the power and phase angle of the element in the stabilizing device according to the resampling sequence.
8. The system of claim 7, wherein the deviation obtaining module comprises:
the phase deviation value acquisition module is used for inputting rated voltage and rated current to the voltage and current loop of an element in the safety and stability control device through the relay protection instrument, inputting rated voltage to the calibration voltage loop, calculating the phase difference of all voltage and current loop analog quantity output by the relay protection instrument to be 0 degrees point by point through a Fourier algorithm to obtain the voltage and current of the element and the initial phase angle of the current cycle of the calibration voltage loop, and finding out the phase deviation values of the voltage, the initial phase angle of the current cycle of the current cycle of the element and the initial phase angle of the current cycle of the calibration voltage;
a time deviation value obtaining module for obtaining the time deviation value by adopting the following formula
Figure FDA0003289688010000032
wherein ,VmComparing the initial phase angle of the analog quantity of the mth loop of the element with the initial phase angle phase deviation value, delta t, of the calibration voltagebmTime deviation value f representing the phase of the analog quantity initial phase angle of the mth loop of the element compared with the phase of the calibration voltage0Is the nominal frequency.
9. The system as claimed in claim 7, wherein the resampling module for obtaining the resampling sequence of the component loop according to the time offset value and the time interval between two adjacent sampling points at the current frequency and the rated frequency comprises:
calculating values for all loops of the element
Figure FDA0003289688010000033
Wherein m is equal to [1, n ]]，j∈[0,N-1]M is the loop serial number, N is the maximum value of the analog quantity loop serial number contained in the element, j is the number of sampling points for starting to back off at the current sampling point, and N is the number of points needing to be re-sampled;
will wm,jThe integer part of (A) is denoted as Pm,jThe decimal part is denoted by km,jThe mth loop is backed off from the current time by Pm,jTsThe voltage and current values at the original sampling point of time are recorded as
Figure FDA0003289688010000041
The mth loop moves back (P) from the current timem，j+1)TsOf the original sample point in timeThe voltage and current values are recorded as
Figure FDA0003289688010000042
The mth loop moves back (P) from the current timem,j+2)TsThe voltage and current values at the original sampling point of time are recorded as
Figure FDA0003289688010000043
The mth loop moves back jT from the current timesValue of' resample point of time
Figure FDA0003289688010000044
And (4) resampling all loops of the element by N points according to the formula (4) to obtain a resampling sequence.
10. The system of claim 9, wherein the power and phase angle calculation module comprises:
an active power calculation module for obtaining active power by the formula 5)
Figure FDA0003289688010000045
A reactive power calculation module for obtaining the reactive power by the formula (6)
Figure FDA0003289688010000046
A phase angle calculation module for obtaining the phase angle by the formula (7)
Figure FDA0003289688010000047
wherein ,ua、ub、ucRespectively represent the serial numbers of the loops of the three-phase voltage,the loop serial numbers of the three-phase currents are respectively ia、ib、icAnd (4) showing.
11. A power and phase angle measuring system of a safety and stability control device is characterized by comprising a memory and a processor;
the memory is to store instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 6.
12. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 1 to 6.
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