CN102819004A - Comprehensive detecting and analyzing platform for performance of digital electric energy metering systems of intelligent transformer substations - Google Patents

Abstract

A comprehensive detection and analysis platform for the performance of a digital electric energy metering system in a smart substation, equipped with a detection system and a background expert system, the detection system includes an electronic transformer detection system, a digital/digital input electric energy meter detection system and digital electric energy metering Comprehensive performance testing system. The present invention can carry out real-time monitoring and value traceability of electronic/optical current transformers, electronic voltage transformers, and digitized/digital input electric energy meters at the same time through the background expert system, and can be integrated with analog systems and in The comparison and analysis of electric energy data between multi-channel digital quantity systems is carried out to complete the comprehensive performance test of the digital quantity electric energy metering system. Through multiple information collection channels, comprehensively consider the measurement risk points of the system, make the detection results more comprehensive and comprehensive, help to improve the accuracy of smart substation and digital substation measurement, and provide good technical support for the construction of smart substations and digital substations.

Description

Intelligent substation digital energy metering system performance comprehensive detection and analysis platform

technical field

The invention belongs to the technical field of measurement and detection of intelligent substations in power systems, and relates to a detection and analysis technology for a digital electric energy measurement system of an intelligent substation, specifically a performance comprehensive detection and analysis platform for a digital electric energy measurement system of an intelligent substation.

Background technique

Smart substation is an indispensable and important part of smart grid construction. At present, the development of smart substation and digital substation has entered the stage of large-scale engineering application. It has begun to be widely used in the power system, and the digital electric energy metering system has also been established. The detection of digital metering can no longer be detected simply according to the transmission of analog quantities.

The risk points that digital measurement may affect the accuracy of the measurement system mainly include the following aspects, electronic transformer current transformer, electronic voltage transformer, digital link, environmental influence, power factor and synchronization, etc. of different principles. However, there are still relatively few applications of digital electric energy metering in the world, so there is no research on the traceability of digital electric energy metering and detection comparison analysis. In the field of laboratory testing of digital measurement, it still stays in the offline single detection stage of electronic transformers and digital input electric energy meters established according to the traditional analog measurement system, that is, electronic transformer detection, digital electric energy meter detection, etc., while The impact of the digital measurement system that we should be most concerned about is basically out of reach, and the comprehensive comparison analysis system has already had some measurement comparisons on site, mainly reflected in the comparison of the results of the digital measurement system and the traditional measurement system. Therefore, the overall traceability detection verification and performance comprehensive analysis of the digital metering system have not yet been established, which cannot reflect the real error points of the digital metering, and all the metering and testing processes are uncontrollable, which brings the digital energy metering of smart substations. a great danger.

The metering system of a conventional substation is composed of sub-equipment. Its technical principles are mature, and the metering risk points are also within the controllable range. However, the digital metering system is currently in the analysis of error points, temperature and humidity characteristics of electronic transformers , Whether the synchronization of current and voltage meets the accuracy requirements of measurement, and the impact of abnormal digital links on measurement accuracy have not yet been answered. This has become a problem that cannot be solved in the traceability process of digital measurement at present, and has become the biggest obstacle restricting the development of smart substations and digital substations. Now all digital measurement adopts offline single detection and analysis methods, which are essentially analog or digital standard sources for discrete detection and analysis of digital quantities, which cannot satisfy the overall traceability of our digital measurement system at all. And the requirements of comprehensive performance analysis.

Therefore, judging from the current situation, there is an urgent need for a detection and performance analysis platform to perform real-time performance detection and analysis on the digital metering system, and comprehensive testing for the digital metering system, that is, to integrate various principles of electronic transformers, digital/digital quantities A comprehensive and real-time smart substation digital energy metering system performance comprehensive detection and analysis platform that inputs multiple factors such as electric energy meters and digital links, and can trace the source according to the analog traceability system at the same time, meeting the requirements of our traditional metering traceability system for metering. It can also solve the risk point problem of digital measurement.

Contents of the invention

The technical purpose of the present invention is to overcome the deficiencies of the prior art, build a real-time online smart substation digital electric energy metering system detection platform, and mainly aim at measuring equipment such as electronic transformers and digital/digital input electric energy meters widely used in smart substations. Analysis of equipment performance and traceability detection of electric energy, etc.

Technical scheme of the present invention is:

A comprehensive detection and analysis platform for the performance of a digital electric energy metering system in a smart substation, characterized in that it is provided with a detection system and a background expert system, and the detection system includes:

A), electronic transformer detection system;

The electronic voltage transformer, electronic current transformer or optical current transformer connected to the power line transmits the electrical data collected by each to the background expert system through the network according to the IEC61850 protocol;

The dual-channel data acquisition module in the electronic transformer calibrator is used to synchronize with the equipment under test to collect the current and voltage data of the power line after passing through the standard transformer as a reference and transmit it to the background expert system. The IEC61850 message data sent by the equipment is compared, and the calculation module in the background expert system completes the traceability detection of the error of the electronic transformer to be tested, and analyzes and counts the results of the traceability detection through the background expert system;

B), digital/digital input electric energy meter detection system;

The electronic voltage transformer, electronic current transformer and optical current transformer transmit the collected data to the digital/digital input electric energy meter to be measured, and calculate the electric energy in the electric energy meter;

Connect the analog standard electric energy meter and an analog electric energy meter in series, collect the current and voltage data of the power line at the same time, and calculate the electric energy; the analog standard electric energy meter is used as the traceability standard, and the digital/digital electric energy meter and the analog electric energy meter to be tested Both send pulses reflecting their respective measured electric energy values to the analog standard electric energy meter, complete the error analysis of the electric energy meter to be tested and the traceability detection of the electric energy in the analog standard electric energy meter, and carry out the traceability detection results through the background expert system Statistical Analysis;

C), digital electric energy metering comprehensive performance detection system;

The analog electric energy meter transmits electric energy data to the background expert system through a protocol converter;

The multi-channel synchronous data acquisition conversion module in the digital electric energy meter calibrator is used to collect the voltage and current data of the power line after passing through the standard transformer. The synchronous data acquisition conversion module outputs the collected data to a separate digital/digital input electric energy meter, calculates the electric energy and transmits the calculation results to the background expert system;

At the same time, the digital/digital input watt-hour meter that receives the output data of the electronic transformer also transmits the calculated electric energy value to the background expert system;

Real-time and long-term data comparative analysis is carried out on the measurement results of the above-mentioned several channels of analog or digital electric energy in the background expert system.

Further technical solutions include:

In order to protect the measurement equipment or the acquisition module, when collecting the current value, a standard current transformer is provided in the line connecting the dual-channel data acquisition module and the power line, and the primary current enters the dual circuit as a standard source after being converted by the standard current transformer. One-way data acquisition module; when collecting voltage values, the line connecting the two-way data acquisition module and the power line is provided with an inductive voltage divider, and the primary voltage enters the two-way data acquisition as a standard source after being converted by the inductive voltage divider module;

The data collected by the multi-channel synchronous data acquisition and conversion module is also the output value of the primary current or primary voltage converted by a standard current transformer or an inductive voltage divider.

The analog standard electric energy meter and the analog electric energy meter receive the output current and primary voltage converted by the standard current transformer, and calculate the electric energy.

The data collected by the electronic voltage transformer, electronic current transformer or optical current transformer to be tested is transmitted to the background expert system through the merging unit, and the electronic current transformer and the optical current transformer correspond to different merging units.

The electronic transformer detection system is also provided with a synchronization source device, which automatically adjusts the acquisition time of the two-way data acquisition module according to the read or set rated time delay of the transformer, and sends data to the two-way data acquisition module through the synchronization source device. and the merging unit MU to send a synchronous pulse, clear the counting bit of the merging unit MU and simultaneously trigger the dual-channel data acquisition module to start collecting data.

The merging unit MU sends the data to the corresponding SMV message controller, and the message controller transmits the data to the corresponding digital/digital input electric energy meter through the switch; the multi-channel synchronous data acquisition conversion module will The data is transmitted to the corresponding SMV message controller, and the message controller transmits the data to the corresponding digital/digital input power meter through the switch;

The background expert system is provided with a message control system that controls the operation of the above-mentioned SMV message controller, and the abnormality and packet loss of the SMV message are set as required to complete the digital/digital input electric energy under the condition of abnormal and lost field network messages. Analysis of meter meter performance.

Considering the impact of environmental factors and vibration on the performance of the transformer, the platform of the present invention is also equipped with an acquisition module for collecting environmental factors and vibration data parameters of the transformer, and transmits the collected data to the background expert system to analyze the performance of the electronic transformer , considering possible errors, the environmental factors include temperature, humidity and so on. At the same time, the optical power of the input port and the output port interface of the merging unit MU can be tested by the optical power meter, and related test experiments of network communication can be carried out by changing the connection mode of the sampling value of the digital/digital input electric energy meter.

The dual-channel data acquisition module can adopt the high-accuracy dual-channel data acquisition module of the existing electronic transformer calibrator; the multi-channel synchronous data acquisition conversion module can also adopt the high-accuracy digital electric energy meter calibrator. Accuracy multi-channel synchronous data acquisition and conversion module; the accuracy level of the electronic transformer calibrator and the digital electric energy meter calibrator should be above 0.05, and the high-accuracy dual-channel data acquisition module and high-accuracy The maximum allowable error of the multi-channel synchronous data acquisition and conversion module is required to be controlled within 0.05%.

A booster/booster is used at the power supply side to complete the required voltage and current, and a phase shifter is set to control the phase angle relationship between booster current and booster voltage. Can

Beneficial effects of the present invention:

Through the background expert system, the present invention can simultaneously perform real-time monitoring and value traceability of metering equipment in intelligent substations, such as electronic/optical current transformers, electronic voltage transformers, and digitized/digital input electric energy meters, and can Comparing and analyzing the electric energy data between the analog quantity system and the multi-channel digital quantity system, and completing the comprehensive performance detection of the digital quantity electric energy measurement system. Through multiple information collection channels, comprehensively consider the measurement risk points of the system, make the detection results more comprehensive and comprehensive, help to improve the accuracy of smart substation and digital substation measurement, and provide good technical support for the construction of smart substations and digital substations.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the present invention.

Detailed ways

In order to clarify the technical scheme and technical effect of the present invention, the present invention will be further introduced below in conjunction with the accompanying drawings and specific implementation methods.

The intelligent substation digital energy metering system performance comprehensive detection and analysis platform of the present invention is equipped with a detection system and a background expert system for analyzing data, as shown in Figure 1, (for clarity, the collection current and the collection voltage are shown separately, but the two power lines In fact, it is the same source line), the voltage and current signals of the power supply are output to the equipment under test one way, and the other way is output to the detection equipment of the platform. The detection system includes:

A), electronic transformer detection system;

The transformers include current transformers (CT) and potential transformers (PT). The electronic voltage transformer, electronic current transformer and optical current transformer connected to the power line transmit the electrical data collected by each to the SMV message controller through the merging unit (MU). The current transformer corresponds to the first merging unit, and the optical current transformer corresponds to the second merging unit.

Use the existing high-accuracy dual-channel data acquisition module of the electronic transformer calibrator to collect current signals, and connect the electronic transformer calibrator to the power line through one line. The primary current is converted by standard CT, and its output value Enter the dual-channel data acquisition module as the standard source side, the primary voltage is converted by the inductive voltage divider, and its output value enters the dual-channel data acquisition module as the standard source side, and the dual-channel data acquisition module passes the collected current and voltage signals through the total The switch is transmitted to the background expert system.

The system is also equipped with a synchronization source device, which automatically adjusts the acquisition time of the dual-channel data acquisition module according to the read or set rated time delay of the electronic transformer. The synchronization source device sends a synchronization pulse to the data acquisition module and the merging unit of the electronic transformer calibrator, clears the counting bit of the merging unit and triggers the data acquisition module to start collecting at the same time. The time of the rising edge of the synchronization pulse is recorded as the zero time, and the merging unit is synchronized to send data with a time stamp. The data with a counter of zero can be regarded as the data at the zero time. The data collected by the module is calculated and compared, so that the experimental data such as phase difference and ratio difference generated by the transformer can be accurately obtained.

B), digital/digital input electric energy meter detection system;

In order to protect the instrument, the digital energy meter calibrator is the same as the electronic transformer calibrator, and what is collected is the current converted by the standard CT and the output voltage of the inductive voltage divider, which can be obtained by converting the conversion ratio. The current and voltage values to the analog energy meter are used as a reference.

During the traceability detection process of electric energy, the digital/digital input electric energy meter and the analog electric energy meter to be tested respectively send the electric energy value collected and calculated to the analog standard electric energy meter in the form of pulse, and the analog standard electric energy meter is used as the traceability Standard, the error analysis and the traceability detection of electric energy are completed in the analog standard electric energy meter, and the results of the traceability detection are statistically analyzed through the background expert system.

A booster/booster is used at the power supply side to complete the required voltage and current, and a phase shifter is set to control the phase angle relationship between booster current and booster voltage. .

C), digital electric energy metering comprehensive performance testing system

The digital/digital input watt-hour meters to be tested include digital watt-hour meter 1#, digital watt-hour meter 2# and digital watt-hour meter 3#. Calculate the electric energy value of the data, and transmit the electric energy value to the background expert system through the switch.

Set the high-precision analog standard electric energy meter and the analog electric energy meter to collect the current and primary voltage data converted by the standard CT through another line, and calculate the electric energy. The analog standard electric energy meter and the analog electric energy meter are connected in series in the line to simulate the electric energy The table transmits the electric energy data to the background expert system through the protocol converter and the main switch.

At the same time, the high-accuracy multi-channel synchronous data acquisition conversion module of the existing digital electric energy meter calibrator can be used to synchronously collect the current and voltage values connected to the analog electric energy meter, and collect the data according to the IEC1850-9-2 protocol Output to the SMW message controller, output the data to the digital meter 3# through the switch, and the digital meter 3# transmits the calculated electric energy value to the background expert system through the main switch.

The background expert system completes the real-time comparative analysis of electric energy data between digital and analog systems through the above multiple input data.

The background expert system is equipped with a message control system (not shown) that controls the operation of the above-mentioned SMV message controller. The SMV message controller sends messages according to the requirements of the upper message control system, and transmits the data to Background expert system.

Relevant test experiments of network communication can be carried out by changing the wiring mode of the sampling value of the digital/digital input watt-hour meter.

The platform is also equipped with an acquisition module for collecting environmental factors and vibration data parameters, and transmits the collected data to the background expert system to analyze the impact of external factors on the performance of the equipment and the impact of performance changes on the accuracy of the collected data, in order to ensure the accuracy of the platform monitoring data. comprehensiveness of the analysis process.

For the high-accuracy electronic transformer calibrator and digital energy meter calibrator, there is no clear grade definition in the industry. In the present invention, it is generally required to be above 0.05 grade, and the maximum allowable error of its data acquisition module should be controlled Within 0.05%.

The basic principles, main features and advantages of the invention are shown and described. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. intelligent substation digitalized electric energy metering system performance synthesis detects and analysis platform, it is characterized in that be provided with detection system and backstage expert system, said detection system comprises:

A), electronic mutual inductor detection system;

The electronic type voltage transformer to be measured, electronic current mutual inductor or the optical current mutual inductor that are connected with power lead are sent to backstage expert system according to the IEC61850 stipulations through the networking with the electricity data that collect separately;

Adopt two-way data acquisition module and Devices to test synchronous acquisition power lead in the electronic transducer calibration instrument through the electric current behind the standard mutual inductor, voltage data is as reference and transfer to the backstage expert system; The message data of the IEC61850 that in the expert system of backstage, sends with Devices to test compares; Accomplish detections of tracing to the source of the error of electronic mutual inductor to be measured by the computing module in the expert system of backstage, and the result of the detection of tracing to the source is carried out analytic statistics through the backstage expert system;

B), digital/digital quantity input electric energy meter detection system;

Said electronic type voltage transformer, electronic current mutual inductor or optical current mutual inductor to digital/digital quantity input electric energy meter transmission to be measured, carry out the calculating of electric flux with the data that collect in electric energy meter;

With a mock standard electric energy meter and a simulation electric energy meter series connection, gather the electric current and the voltage data of power lead simultaneously, and carry out the calculating of electric flux; The mock standard electric energy meter is as tracing to the source standard; Digital/digital quantity electric energy meter all sends reflection to the mock standard electric energy meter with the simulation electric energy meter, and it records the pulse of electric energy value separately; In the mock standard electric energy meter, accomplish the error analysis of electric energy meter to be measured and the detection of tracing to the source of electric energy, and the result who detects that traces to the source is carried out statistical study through the backstage expert system;

C), digitalized electric energy metering combination property detection system;

Said simulation electric energy meter is sent to the backstage expert system through protocol converter with energy data;

Adopt the multipath synchronous data in the digitalized electrical energy meter tester to gather voltage, current data after modular converter is gathered power lead process standard mutual inductor; This multipath synchronous data is gathered modular converter and above-mentioned simulation electric energy meter synchronous acquisition; Said multipath synchronous data is gathered modular converter and is exported the data of its collection to independent digital/digital quantity input electric energy meter, carries out the calculating of electric flux and result of calculation is transferred to the backstage expert system;

Digital/digital quantity input the electric energy meter that receives the electronic mutual inductor output data simultaneously also transfers to the backstage expert system with the electric energy value of its calculating;

Metering result to above-mentioned several roads analog or digital electric flux in the expert system of backstage implements real-time, long-term data comparative analysis.

2. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 1 detects and analysis platform, it is characterized in that:

When gathering current value, be provided with standard current transformer in said two-way data acquisition module and the circuit that power lead is connected, primary current passes through after the conversion of standard current transformer as standard source entering two-way data acquisition module;

When gathering magnitude of voltage, be provided with inductive voltage divider in said two-way data acquisition module and the circuit that power lead is connected, primary voltage passes through after the conversion of inductive voltage divider as standard source entering two-way data acquisition module;

The data that said multipath synchronous data collection modular converter is gathered also are the output valve after primary current or primary voltage process standard current transformer or the inductive voltage divider conversion.

3. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 2 detects and analysis platform, it is characterized in that:

Said mock standard electric energy meter receives electric current and primary voltage through the output after the standard current transformer conversion with the simulation electric energy meter, carries out the calculating of electric flux.

4. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 2 detects and analysis platform, it is characterized in that:

The data of said electronic type voltage transformer to be measured, electronic current mutual inductor or optical current mutual inductor collection transfer to the backstage expert system through merge cells, the merge cells that electronic current mutual inductor is corresponding different respectively with optical current mutual inductor.

5. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 4 detects and analysis platform, it is characterized in that:

Said electronic mutual inductor detection system also is provided with the synchronisation source device; The collection moment of two-way data acquisition module is regulated in specified time-delay automatically according to the mutual inductor that reads or set; Send synchronizing pulse through the synchronisation source device to said two-way data acquisition module and merge cells, with the meter digital zero clearing of merge cells and trigger said two-way data acquisition module BOB(beginning of block) image data simultaneously.

6. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 4 detects and analysis platform, it is characterized in that:

Said merge cells is sent to corresponding SMV message controller with data, and this message controller is imported electric energy meter through switch with data transmission to digital/digital quantity corresponding with it;

Said multipath synchronous data is gathered modular converter with data transmission to the SMV message controller corresponding with it, and this message controller is imported electric energy meter through switch with data transmission to digital/digital quantity corresponding with it;

Said backstage expert system is provided with the message control system of the above-mentioned SMV message controller operation of control; Unusual and the packet loss of SMV message is set as required, accomplish the field network message unusual with loss condition under digital/digital quantity import the analysis of electric energy meter metering performance.

7. detect and analysis platform according to the described a kind of intelligent substation digitalized electric energy metering system performance synthesis of arbitrary claim among the claim 1-6, it is characterized in that:

Be provided with the acquisition module of gathering environmental factor and mutual inductor vibration data parameter, with the analysis of carrying out the electronic mutual inductor metering performance in data transmission to the backstage expert system of gathering.

8. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 7 detects and analysis platform, it is characterized in that:

Test the luminous power of input end and the output terminal interface of said merge cells MU through light power meter;

The sampled value mode of connection of/digital quantity input electric energy meter digital through changing is carried out the dependence test experiment of network service.

9. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 8 detects and analysis platform, it is characterized in that:

The class of accuracy of said electronic transducer calibration instrument and digitalized electrical energy meter tester should be more than 0.05 grade, and said two-way data acquisition module and multipath synchronous data are gathered the modular converter limits of error and be controlled in 0.05%.

10. a kind of intelligent substation digitalized electric energy metering system performance synthesis according to claim 7 detects and analysis platform, it is characterized in that:

Power end adopts up-flow/stepup transformer to accomplish required voltage and current, and the phase angle relationship that phase shifter is controlled up-flow and boosted is set.

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