CN108508401B - System and method for analyzing electric energy meter voltage loss electric quantity compensation error - Google Patents
System and method for analyzing electric energy meter voltage loss electric quantity compensation error Download PDFInfo
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Abstract
The invention discloses an electric energy meter voltage loss electric quantity compensation error analysis system, which is arranged at a transformer wire outlet end and comprises a three-phase voltage measurement unit, a power supply fault judgment unit, a three-phase unbalance calculation unit, an error search unit, a data storage and transmission unit and a power supply unit, wherein the three-phase voltage measurement unit is used for measuring the voltage loss electric quantity of an electric energy meter; the three-phase voltage measuring unit is used for measuring three-phase voltage in real time, and measuring results are used for calculating the negative sequence unbalance and the zero sequence unbalance; the power supply fault judgment unit evaluates whether a power supply fault exists or not by calculating the amplitude of each phase voltage; determining the electric quantity compensation error by an interpolation method through an error lookup table by taking the maximum three-phase unbalance as a boundary condition according to the calculated negative sequence unbalance and zero sequence unbalance; the invention realizes the quantitative analysis of the voltage-loss electric quantity compensation error of the electric energy meter, and the analysis result is used as the electric quantity compensation error reference value to evaluate the compensation electric energy in the work of negotiating compensation and counting less electric energy due to voltage-loss fault of the electric energy meter.
Description
Technical Field
The invention relates to a system and a method for analyzing the compensation error of the voltage-loss electric quantity of an electric energy meter, belonging to the field of power distribution and utilization automation.
Background
During the operation of the electric energy metering device on the spot, voltage loss is one of the faults which often occur. The voltage loss fault often causes less electric quantity to be counted and needs to be supplemented afterwards, and the current method generally adopts a manual analysis calculation method, and has the problems that the calculation method is not unified, time and labor are wasted, and the intelligent requirement of power utilization is not met. With the development of the smart power grid, the automation level of the power grid operation is higher and higher, and the compensation of the voltage-loss electric quantity also seeks to adopt a new automatic calculation method to replace the traditional manual calculation. Under the background, two methods for calculating the compensation of the voltage loss electric quantity are proposed, namely a power substitution method; the second is a voltage substitution method. The power substitution method is a traditional electric quantity compensation method, the premise is that the three-phase load power is symmetrical, and the A-phase voltage loss in a three-phase four-wire system is taken as an example, if the voltage is from U0Down to U1If the power of the compensation electric quantity is as follows:
in the formula, PsIs the power, P, of the electric quantity to be compensatedavrageIs the normal average power of the B and C phases. The method improves the accuracy of electric quantity compensation to a certain extent, and simultaneously provides an automatic calculation method for electric quantity compensation, but has the defects that price adjustment is rigorous on the premise, namely three-phase load symmetry needs to be assumed, the error is large in practical application, and evaluation is difficult. The voltage substitution method weakens the precondition assumption condition, only three-phase voltage symmetry needs to be assumed, and no requirement is imposed on the load. Still taking the a-phase voltage loss in the three-phase four-wire system as an example, the correct electric quantity and power are:
in the formula, the U and I with subscriptThe other is the corresponding phase voltage and phase current,
and
the chase is an A, C phase power angle,
the specific diagram of the included angle of the phase B current after the phase A voltage rotates 120 degrees clockwise is shown in FIG. 1. Compared with a power substitution method, the method weakens the precondition, so that the error is smaller, the method is the most promising automatic compensation calculation method for the voltage loss electric quantity in practical application, and the method is also applied to the part of national network and south network. However, the calculation method is not popularized in a large range, and the most important reason is that the method is adopted to supplement the electric quantity with errors, and the errors are not effectively evaluated at present.
In summary, the current work of supplementing the small amount of electricity caused by the voltage loss of the electric energy meter mainly depends on manual calculation, the provided voltage substitution method meets the requirements of practical application, but the error cannot be quantitatively analyzed, and the popularization and the application of the method are hindered. Therefore, it is necessary to provide a system and a method for analyzing the compensation error of the voltage-loss electric quantity of the electric energy meter, so as to provide a reference for the compensation error of the electric quantity.
Disclosure of Invention
The invention provides a system and a method for analyzing the compensation error of the voltage-loss electric quantity of an electric energy meter, and solves the problem of quantitative analysis of the error of the electric quantity which is less due to the voltage loss of the electric energy meter by adopting a voltage substitution method for compensation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a system for analyzing the compensation error of the voltage loss and the electric quantity of an electric energy meter comprises a three-phase voltage measuring unit, a power supply fault judging unit, a three-phase unbalance degree calculating unit, an error searching unit, a data storing and sending unit and a power supply unit;
the three-phase voltage measuring unit comprises three voltage sensors and a signal processing module and is used for continuously measuring the line voltage in real time; the three voltage sensors are respectively used for measuring three-phase voltages and are connected with the signal processing module, and the signal processing module is connected with the power supply fault judgment unit and the three-phase unbalance degree calculation unit and is sequentially connected with the power supply fault judgment unit, the three-phase unbalance degree calculation unit, the error searching unit and the data storage and sending unit;
the power supply fault judgment unit receives voltage measurement data of the three-phase voltage measurement unit and judges whether a power supply fault occurs in real time according to a power supply fault judgment criterion;
the three-phase unbalance calculation unit is controlled by the power supply fault judgment unit, when the power supply fault judgment unit judges that power supply faults occur, the three-phase unbalance is stopped to be calculated, otherwise, the negative sequence and zero sequence unbalance of three-phase voltage are calculated in real time, and the calculation result is stored and uploaded to the error search unit;
the error searching unit determines an electric quantity compensation error value by adopting an interpolation method or a function fitting method by taking the maximum three-phase unbalance as a boundary condition according to the three-phase unbalance of the negative sequence and the zero sequence;
the data storage and transmission unit stores the electric quantity compensation error value to the local area, so that the electric quantity compensation error value is convenient to check afterwards, and simultaneously, the electric quantity compensation error value is transmitted to the electric energy acquisition terminal to be used as an electric quantity compensation error reference value to evaluate the compensation electric energy;
the power supply unit provides electric energy for the unit modules.
The sensing device of the three-phase voltage measuring unit is an electromagnetic voltage transformer or an electronic voltage transformer and comprises two measuring configuration modes of a three-phase three-wire system and a three-phase four-wire system, and the signal processing module is used for conditioning, sampling and calculating voltage signals.
The error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, the electric quantity compensation error data are related to negative sequence unbalance degrees and zero sequence unbalance degrees, the maximum three-phase unbalance degree is taken as a boundary condition, and the electric quantity compensation error value under any unbalance degree combination is determined through an interpolation method or a function fitting method.
And analyzing the obtained electric quantity compensation error value, and transmitting the electric quantity compensation error value to the electric energy acquisition terminal through the data storage and transmission unit.
The power supply unit adopts a battery or a coil to obtain energy or a capacitor to obtain energy.
A method for analyzing the compensation error of the voltage loss electric quantity of an electric energy meter comprises the following steps:
1) the three-phase voltage measuring unit measures three-phase voltage in real time;
2) the power supply fault judgment unit judges a fault event by calculating the amplitude of each phase voltage of the three phases, stops the calculation of the unbalance degree of the three phases or shields the calculation result once the power supply fault is judged to occur, and otherwise, enters the step 3);
3) the three-phase unbalance degree calculation unit calculates the three-phase unbalance degrees of the negative sequence voltage phasor, the zero sequence voltage phasor and the positive sequence voltage phasor;
the negative sequence three-phase unbalance calculation formula is as formula (1):
In the formula, epsilonNegative poleIs the negative sequence three-phase unbalance degree,
is a positive-sequence voltage phasor and is,
is a negative-sequence voltage phasor and is,
Vab、Vbc、Vcais a three-phase line voltage;
the zero sequence three-phase unbalance calculation formula is as formula (2):
εzeroIs a zero sequence three phaseThe degree of the unbalance is calculated,
is a positive-sequence voltage phasor and is,
is zero sequence voltage phasor;
4) the error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, and the electric quantity compensation error data is calculated by taking the negative sequence unbalance degree and the zero sequence unbalance degree as boundary conditions;
the step 4) specifically comprises the following steps:
401) recording the three-phase unbalance degree epsilon as a negative sequence three-phase unbalance degree epsilonNegative poleLet us order
UA、UBAnd UCIs a three-phase voltage, and is,
is the angle of the A, B phase voltage,
is an included angle of B, C phase voltage to obtain UA、UBAnd the three-phase unbalance satisfies formula (3):
402) setting a boundary, and adopting a traversal numerical calculation method;
403) x is calculated under the conditions of step 401) and step 402), and electric quantity compensation error data η is calculated by equation (4):
when the phase B is in the state of pressure loss,
when the pressure of the phase C is lost,
when the phase A is in a pressure loss state,
5) Determining an electric quantity compensation error value by using the maximum three-phase unbalance as a boundary condition and adopting an interpolation method or a function fitting method through an error lookup table;
6) and the electric quantity compensation error value is stored locally and is simultaneously sent to the electric energy data acquisition terminal to be used as an electric quantity compensation error reference value.
The invention has the beneficial effects that:
(1) the invention realizes the quantitative analysis of the compensation error of the loss voltage electric quantity of the electric energy meter; at present, the three-phase unbalance is only specified to be negative sequence unbalance by national standards, and step 3) widens the single boundary condition into double boundary conditions by calculating the negative sequence unbalance and the zero sequence unbalance, so that an error evaluation result is more practical. Step 5) determining an error value under any combination of the negative sequence unbalance and the zero sequence unbalance by adopting an interpolation method or a function fitting method;
(2) the method is combined with the existing 'voltage substitution method for supplementing the voltage-loss electric quantity', so that the automatic calculation and popularization and application of the voltage-loss electric quantity supplementing can be promoted;
(3) the voltage measuring unit is arranged on the distribution transformer, and can also be used for monitoring other operation parameters of a line in real time and used as a distribution transformer monitoring terminal.
Drawings
The invention is further explained below with reference to the figures and examples;
FIG. 1 is a schematic diagram of voltage-loss electric quantity compensation by voltage substitution;
FIG. 2 is a schematic diagram of an implementation of an electric energy meter voltage loss electric quantity compensation error analysis system;
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, which are illustrative only and not limiting, and the scope of the present invention is not limited thereby.
As shown in fig. 1, an electric energy meter voltage loss and electric quantity compensation error analysis system includes a three-phase voltage measurement unit, a power supply fault determination unit, a three-phase imbalance calculation unit, an error search unit, a data storage and transmission unit, and a power supply unit.
The three-phase voltage measuring unit comprises three voltage sensors and a signal processing module and is used for continuously measuring the line voltage in real time; the three voltage sensors are respectively used for measuring three-phase voltages and are connected with the signal processing module, and the signal processing module is connected with the power supply fault judgment unit and the three-phase unbalance degree calculation unit and is sequentially connected with the power supply fault judgment unit, the three-phase unbalance degree calculation unit, the error searching unit and the data storage and sending unit;
the power supply fault judgment unit receives voltage measurement data of the three-phase voltage measurement unit and judges whether a power supply fault occurs in real time according to a power supply fault judgment criterion;
the three-phase unbalance calculation unit is controlled by the power supply fault judgment unit, when the power supply fault judgment unit judges that power supply faults occur, the three-phase unbalance calculation is stopped or calculation results are shielded, otherwise, the negative sequence and zero sequence unbalance of three-phase voltage are calculated in real time, and the calculation results are stored and uploaded;
the error searching unit determines an electric quantity compensation error value by adopting an interpolation method or a function fitting method by taking the maximum three-phase unbalance as a boundary condition according to the three-phase unbalance of the negative sequence and the zero sequence;
the data storage and transmission unit stores the electric quantity compensation error value to the local, so that the electric quantity compensation error value is convenient to check afterwards, and the electric quantity compensation error value is transmitted to the electric energy acquisition terminal to be used as an electric quantity compensation error reference value to evaluate the compensation electric energy.
The power supply unit provides electric energy for the unit modules.
The three-phase voltage measuring unit, the power supply fault judging unit, the three-phase unbalance degree calculating unit, the error searching unit, the data storing and sending unit and the power supply unit can be separated or integrally designed.
The sensor of the three-phase voltage measuring unit is an electromagnetic voltage transformer or an electronic voltage transformer, and comprises two measuring configuration modes of a three-phase three-wire system and a three-phase four-wire system, and the signal processing module is used for conditioning, sampling and calculating voltage signals.
The fault judgment criterion of the power supply fault judgment unit is in accordance with relevant national standards, and can be higher than the existing standards according to actual needs.
The error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, the electric quantity compensation error data are related to negative sequence unbalance degrees and zero sequence unbalance degrees, the maximum three-phase unbalance degree is taken as a boundary condition, and the electric quantity compensation error value under any unbalance degree combination is determined through an interpolation method or a function fitting method.
And analyzing the obtained electric quantity compensation error value, and transmitting the electric quantity compensation error value to the electric energy acquisition terminal through the data storage and transmission unit.
The power supply unit adopts a battery or coil energy taking or capacitance energy taking mode.
The embodiment is a three-phase four-wire system, and if the A phase is in voltage loss, the normal B-phase voltage vector is rotated by 120 degrees anticlockwise or 240 degrees clockwise to replace the voltage of the voltage loss, so that relatively correct electric energy is calculated. From the above principle, if the three-phase voltages themselves are unbalanced, an electric quantity calculation error is generated, and the error is related to a phase voltage substitution error, including a voltage amplitude difference and a phase difference.
In order to evaluate the electric quantity compensation error, it is first necessary to evaluate the amplitude difference and the phase difference in which the a-phase voltage is replaced by the B-phase voltage. Taking a 10kV line as an example, as shown in fig. 2, a three-phase voltage measuring unit adopts a JSZW3-10A voltage transformer to change 10kV to 100V, then changes 100V to 5V through resistance voltage division or other signal conversion modes, and finally converts an analog quantity to a digital quantity through an a/D converter, and sends the digital quantity to a subsequent functional unit.
And the power supply fault judging unit receives the measurement data of the three-phase voltage measuring unit, judges whether a power supply fault occurs according to the existing threshold value, and stops calculating the three-phase unbalance degree or shields the calculation result once the power supply fault is judged to occur. If no power supply fault exists, the three-phase unbalance calculation unit calculates the negative sequence and zero sequence unbalance of the three-phase voltage in real time.
A method for analyzing the compensation error of the voltage loss electric quantity of an electric energy meter comprises the following steps:
1) the three-phase voltage measuring unit measures three-phase voltage in real time;
2) the power supply fault judgment unit judges a fault event by calculating the amplitude of each phase voltage of the three phases, stops the calculation of the unbalance degree of the three phases or shields the calculation result once the power supply fault is judged to occur, and otherwise, enters the step 3);
3) the three-phase unbalance degree calculation unit calculates the three-phase unbalance degrees of the negative sequence voltage phasor, the zero sequence voltage phasor and the positive sequence voltage phasor;
the negative sequence three-phase unbalance calculation formula is as formula (1):
In the formula, epsilonNegative poleIs the negative sequence three-phase unbalance degree,
is a positive-sequence voltage phasor and is,
is a negative-sequence voltage phasor and is,
Vab、Vbc、Vcais a three-phase line voltage;
the zero sequence three-phase unbalance calculation formula is as formula (2):
εzeroIs the unbalance degree of the three phases of the zero sequence,
is a positive-sequence voltage phasor and is,
is zero sequence voltage phasor.
4) The error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, and the electric quantity compensation error data is calculated by taking the negative sequence unbalance degree and the zero sequence unbalance degree as boundary conditions;
the step 4) specifically comprises the following steps:
401) recording the three-phase unbalance degree epsilon as a negative sequence three-phase unbalance degree epsilonNegative poleLet us order
UA、UBAnd UCIs a three-phase voltage, and is,
is the angle of the A, B phase voltage,
is an included angle of B, C phase voltage to obtain UA、UBAnd the three-phase unbalance satisfies formula (3):
402) setting a boundary, and adopting a traversal numerical calculation method;
403) x is calculated under the conditions of step 401) and step 402), and electric quantity compensation error data η is calculated by equation (4):
as shown in fig. 2, when phase B is out of voltage,
when the pressure of the phase C is lost,
when the phase A is in a pressure loss state,
5) Determining an electric quantity compensation error value by using the maximum three-phase unbalance as a boundary condition and adopting an interpolation method or a function fitting method through an error lookup table;
6) and the electric quantity compensation error value is stored locally and is simultaneously sent to the electric energy data acquisition terminal to be used as an electric quantity compensation error reference value.
Specific error data are shown in table 1. If the calculated unbalance degrees of the negative sequence and the zero sequence are both 1%, the maximum electric energy compensation error is about 0.36% according to the data lookup table.
Table 1 preset error look-up table
The local data storage can be a solid state disk, and the data sending unit can be sent to the electric energy acquisition terminal in a wired or wireless communication mode. The power supply unit can adopt various energy taking modes such as a battery, coil energy taking, capacitor energy taking and the like.
Those skilled in the art can design the invention to be modified or varied without departing from the spirit and scope of the invention. Therefore, if such modifications and variations of the present invention fall within the technical scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A system for analyzing the compensation error of the voltage loss and the electric quantity of an electric energy meter is characterized by comprising a three-phase voltage measuring unit, a power supply fault judging unit, a three-phase unbalance degree calculating unit, an error searching unit, a data storing and sending unit and a power supply unit;
the three-phase voltage measuring unit comprises three voltage sensors and a signal processing module and is used for continuously measuring the line voltage in real time; the three voltage sensors are respectively used for measuring three-phase voltages and are connected with the signal processing module, and the signal processing module is connected with the power supply fault judgment unit and the three-phase unbalance degree calculation unit and is sequentially connected with the power supply fault judgment unit, the three-phase unbalance degree calculation unit, the error searching unit and the data storage and sending unit;
the power supply fault judgment unit receives voltage measurement data of the three-phase voltage measurement unit and judges whether a power supply fault occurs in real time according to a power supply fault judgment criterion;
the three-phase unbalance calculation unit is controlled by the power supply fault judgment unit, when the power supply fault judgment unit judges that power supply faults occur, the three-phase unbalance is stopped to be calculated, otherwise, the negative sequence and zero sequence unbalance of three-phase voltage are calculated in real time, and the calculation result is stored and uploaded;
the error searching unit determines an electric quantity compensation error value by adopting an interpolation method or a function fitting method by taking the maximum three-phase unbalance as a boundary condition according to the three-phase unbalance of the negative sequence and the zero sequence;
the data storage and transmission unit stores the electric quantity compensation error value to the local and transmits the electric quantity compensation error value to the electric energy acquisition terminal to be used as an electric quantity compensation error reference value to evaluate the compensation electric energy;
the power supply unit provides electric energy for each unit module;
the three-phase voltage measuring unit measures three-phase voltage in real time;
the power supply fault judgment unit judges a fault event by calculating the amplitude of each phase voltage of the three phases, stops the calculation of the three-phase unbalance degree or shields the calculation result once the power supply fault is judged to occur, and otherwise enters the three-phase unbalance degree calculation unit;
the three-phase unbalance degree calculation unit calculates the three-phase unbalance degrees of the negative sequence voltage phasor, the zero sequence voltage phasor and the positive sequence voltage phasor;
the negative sequence three-phase unbalance calculation formula is as formula (1):
In the formula, epsilonNegative poleIs the negative sequence three-phase unbalance degree,
is a positive-sequence voltage phasor and is,
is a negative-sequence voltage phasor and is,
Vab、Vbc、Vcathree-phase line voltages respectively;
the zero sequence three-phase unbalance calculation formula is as formula (2):
εzeroIs the unbalance degree of the three phases of the zero sequence,
is a positive-sequence voltage phasor and is,
is zero sequence voltage phasor;
the error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, and the electric quantity compensation error data are calculated by taking the negative sequence unbalance degree and the zero sequence unbalance degree as boundary conditions;
the error searching unit specifically comprises the following steps:
401) recording the three-phase unbalance degree epsilon as a negative sequence three-phase unbalance degree epsilonNegative poleLet us order
UA、UBAnd UCAre respectively three-phase voltage,
is the angle of the A, B phase voltage,
is an included angle of B, C phase voltage to obtain UA、UBAnd the three-phase unbalance satisfies formula (3):
402) setting a boundary, and adopting a traversal numerical calculation method;
403) calculates x under the conditions of step 401) and step 402), and calculates electric quantity compensation error data η:
when the phase B is in the state of pressure loss,
when the pressure of the phase C is lost,
when the phase A is in a pressure loss state,
the three-phase unbalance degree calculation unit determines an electric quantity compensation error value by using an interpolation method or a function fitting method through an error lookup table by taking the maximum three-phase unbalance degree as a boundary condition;
the data storage stores the electric quantity compensation error value locally and simultaneously sends the electric quantity compensation error value to the electric energy data acquisition terminal to serve as an electric quantity compensation error reference value.
2. The system for analyzing the follow-up error of the voltage-loss electric quantity of the electric energy meter according to claim 1, wherein the sensor of the three-phase voltage measuring unit is an electromagnetic voltage transformer.
3. The system for analyzing the follow-up error of the voltage loss and the electric quantity of the electric energy meter according to claim 1, wherein a sensor of the three-phase voltage measuring unit is an electronic voltage transformer.
4. The system for analyzing the follow-up error of the voltage-loss electric quantity of the electric energy meter according to claim 1, which is characterized by comprising two measurement configuration modes of a three-phase three-wire system and a three-phase four-wire system.
5. The system for analyzing the compensation error of the voltage-loss electric quantity of the electric energy meter according to claim 1, wherein the error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, the electric quantity compensation error data is related to negative sequence unbalance and zero sequence unbalance, and the electric quantity compensation error value under any unbalance combination is determined by an interpolation method or a function fitting method by taking the maximum three-phase unbalance as a boundary condition.
6. The system for analyzing the compensation error of the voltage-loss electric quantity of the electric energy meter according to claim 5, wherein the analyzed compensation error value of the electric quantity is sent to the electric energy acquisition terminal through the data storage and sending unit.
7. The system for analyzing the follow-up error of the voltage-loss electric quantity of the electric energy meter according to claim 1, wherein the power supply unit adopts a battery or a coil to obtain energy or a capacitor to obtain energy.
8. A method for analyzing the compensation error of the voltage loss electric quantity of an electric energy meter is characterized by comprising the following steps:
1) the three-phase voltage measuring unit measures three-phase voltage in real time;
2) the power supply fault judgment unit judges a fault event by calculating the amplitude of each phase voltage of the three phases, stops the calculation of the unbalance degree of the three phases or shields the calculation result once the power supply fault is judged to occur, and otherwise, enters the step 3);
3) the three-phase unbalance degree calculation unit calculates the three-phase unbalance degrees of the negative sequence voltage phasor, the zero sequence voltage phasor and the positive sequence voltage phasor;
the negative sequence three-phase unbalance calculation formula is as formula (1):
In the formula, epsilonNegative poleIs the negative sequence three-phase unbalance degree,
is a positive-sequence voltage phasor and is,
is a negative-sequence voltage phasor and is,
Vab、Vbc、Vcathree-phase line voltages respectively;
the zero sequence three-phase unbalance calculation formula is as formula (2):
εzeroIs the unbalance degree of the three phases of the zero sequence,
is a positive-sequence voltage phasor and is,
is zero sequence voltage phasor;
4) the error lookup unit is provided with an error lookup table, the error lookup table is preset with electric quantity compensation error data, and the electric quantity compensation error data is calculated by taking the negative sequence unbalance degree and the zero sequence unbalance degree as boundary conditions;
the step 4) specifically comprises the following steps:
401) recording the three-phase unbalance degree epsilon as a negative sequence three-phase unbalance degree epsilonNegative poleLet us order
UA、UBAnd UCAre respectively three-phase voltage,
is the angle of the A, B phase voltage,
is an included angle of B, C phase voltage to obtain UA、UBAnd the three-phase unbalance satisfies formula (3):
402) setting a boundary, and adopting a traversal numerical calculation method;
403) calculates x under the conditions of step 401) and step 402), and calculates electric quantity compensation error data η:
when the phase B is in the state of pressure loss,
when the pressure of the phase C is lost,
when the phase A is in a pressure loss state,
5) determining an electric quantity compensation error value by using the maximum three-phase unbalance as a boundary condition and adopting an interpolation method or a function fitting method through an error lookup table;
6) and the electric quantity compensation error value is stored locally and is simultaneously sent to the electric energy data acquisition terminal to be used as an electric quantity compensation error reference value.
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| CN110850200B (en) * | 2019-10-28 | 2021-07-30 | 深圳供电局有限公司 | Method, estimation device and system for acquiring load current unbalance degree |
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| CN114152807B (en) * | 2020-09-08 | 2024-04-02 | 武汉国测数据技术有限公司 | Error self-checking three-phase electric energy meter and measuring system and method thereof |
| CN112505613B (en) * | 2020-10-29 | 2023-01-20 | 国网山东省电力公司济宁供电公司 | Method and system for estimating fault loss electric quantity of high-voltage supply and high-voltage metering full-voltage loss metering |
| CN112557720A (en) * | 2020-11-12 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Emergency metering method for high-supply low-metering voltage phase-loss compensation electric quantity |
| CN112485752B (en) * | 2020-11-25 | 2023-03-31 | 国网北京市电力公司 | Intelligent electric energy meter compensation electric quantity calculation method, system, device and storage medium |
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