CN208999486U - High-voltage electric-energy meter high-accuracy compensation system - Google Patents
High-voltage electric-energy meter high-accuracy compensation system Download PDFInfo
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- CN208999486U CN208999486U CN201821663766.8U CN201821663766U CN208999486U CN 208999486 U CN208999486 U CN 208999486U CN 201821663766 U CN201821663766 U CN 201821663766U CN 208999486 U CN208999486 U CN 208999486U
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Abstract
The utility model relates to electric energy metering device calibration technology fields；More particularly to a kind of high-voltage electric-energy meter high-accuracy compensation system, including data acquisition and electrical energy measurement unit, the first communication unit, MCU processing unit, current switching compensating unit, data storage cell, the second communication unit and host computer, the high-tension current sampling loop of high-voltage electric-energy meter is connected to data acquisition and electrical energy measurement unit by current switching compensating unit, and the high tension voltage sampling loop of high-voltage electric-energy meter is connected to data acquisition and electrical energy measurement unit；First communication unit realizes data acquisition and the communication of electrical energy measurement unit and MCU processing unit；The communication of second communication unit realization host computer and MCU processing unit；The compensating parameter of current switching compensating unit is sent to MCU processing unit by host computer.The measuring accuracy of the utility model raising high-voltage electric-energy meter, it is ensured that the fairness of electrical energy measurement.
Description
Technical field
The utility model relates to electric energy metering device calibration technology fields；It is high more particularly to a kind of high-voltage electric-energy meter
Precision compensation system.
Background technique
High-voltage electric energy measurement equipment is connection power generation, powers, the necessary equipment of electricity consumption tripartite, except the meter as trade settlement
Measuring device tool is outer, is also protection, scheduling, production and marketing management system provide metering, measurement, control information, is smart grid height
One of the key equipment that grade measurement system (AMI) is built.Conventional high-tension electric energy measuring equipment is mainly by electric energy meter, mutual induction of voltage
Device, current transformer and secondary circuit are composed, and error is partially negative when having low current, when high current the problem of error polarization,
Poor linearity affects the accuracy of metering.Such device is generally compensated using the method for subitem correction, and electric energy meter is general
Using the method for improving electrical energy meter accuracy, secondary circuit takes secondary voltage drop dynamic compensation technology, and this compensation technique is very
It is mature.Turn compensation, magnetic shunt compensation and more iron core type compensation techniques are generally taken in compensation for mutual inductor.In recent years, electric
The raising of Force system the degree of automation brings development space to high-tension current, the voltage conversion apparatus of weak output signal, it is not required to
The output for wanting relatively high power, it is achievable as long as the signal of the weak output of mV, mA, mW grades of low-power to be mentioned for metering, measurement, protection
For the task of signal.The high-voltage electric energy measurement equipment of this weak signal access, due to using new material new process integrated design,
Measuring accuracy has been greatly improved with respect to conventional metered dose device, but since such equipment all uses weak signal to export, vulnerable to the external world
Although carrying out error compensation using follower or combining unit, but still there are the difficulties such as linear poor, the difficult adjustment of error in interference
Topic.
With the development of electronics and computer technology, although traditional error compensation mode is to the measuring accuracy for improving equipment
It has certain effect, but due to only compensating from hardware, flexibility is poor, is not already adapted to the requirement of new technology.It is high
Can pressure electric energy measuring equipment belongs to the trade settlement measurement instrument of electric energy, since its application has a large capacity and a wide range, therefore accomplish to pacify
Complete reliable, accurate measurement, reduction maintenance are particularly important.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is that: it is high-precision to provide a kind of high-voltage electric-energy meter
Compensation system is spent, improves the measuring accuracy of high-voltage electric-energy meter, it is ensured that the fairness of electrical energy measurement.
The technical scheme adopted by the utility model for solving the technical problem is:
The high-voltage electric-energy meter high-accuracy compensation system, including it is data acquisition and electrical energy measurement unit, first logical
Believe unit, MCU processing unit, current switching compensating unit, the second communication unit and host computer, wherein
Current switching compensating unit realizes the error compensation of high-voltage electric-energy meter current signal；
Data acquisition and electrical energy measurement unit, for acquiring each phase voltage, the electric current of high-voltage electric energy measurement equipment, high-voltage electricity
The high-tension current sampling loop of energy metering device is connected to data acquisition and electrical energy measurement unit by current switching compensating unit,
The high tension voltage sampling loop of high-voltage electric-energy meter is connected directly to data acquisition and electrical energy measurement unit；
First communication unit realizes data acquisition and the communication of electrical energy measurement unit and MCU processing unit；
Second communication unit realizes the communication of host computer and MCU processing unit；
The compensating parameter of current switching compensating unit is sent to MCU processing unit by host computer；
MCU processing unit receives and processes the information that data processing unit and host computer are sent, is controlled according to processing result
The movement of current switching compensating unit；
Data storage cell, for storing the received data of MCU processing unit.
Wherein, preferred embodiment are as follows:
The high-voltage electric-energy meter high-accuracy compensation system further includes voltage switching compensating unit, the high-voltage electricity
The high tension voltage sampling loop of energy metering device switches compensating unit by voltage and is connected to data acquisition and electrical energy measurement unit.
The current switching compensating unit includes the multichannel RLC compensation circuit and the direct-connected circuit of a way switch of parallel connection, described
RLC compensation circuit includes one or more of resistance, capacitor and inductance in parallel, and every road resistance is inductively or capacitively distinguished
It is connected to MCU processing unit by driving triode, driveing triode tube base connects the I/O mouth of MCU processing unit, drives three poles
Pipe emitter connects resistance/appearance/sense of RLC compensation circuit, and driving triode collector connects external power supply, switchs direct-connected circuit
It only include a driving triode, the driving triode emitter for switching direct-connected circuit is connected to data acquisition and electrical energy measurement list
Member.
The voltage switching compensating unit includes multichannel RLC compensation circuit and the direct-connected circuit of a way switch in parallel, with electricity
Stream switching compensating unit is identical, and the RLC compensation circuit of voltage switching compensating unit includes in resistance in parallel, capacitor and inductance
One or more, every road resistance are inductively or capacitively connected to MCU processing unit by driving triode respectively, drive three poles
Pipe base stage connects the I/O mouth of MCU processing unit, and driving triode emitter connects resistance/appearance/sense of RLC compensation circuit, driving
Transistor collector connects external power supply, and switching direct-connected circuit only includes a driving triode, switchs the driving of direct-connected circuit
Transistor emitter is connected to data acquisition and electrical energy measurement unit.
The host computer be equipped with switching compensation control unit, switching compensation control unit corresponding current switching compensating unit and
The every of voltage switching compensating unit is respectively provided with a control button all the way, and control button can be software realization can also be with hardware reality
Existing, two kinds of implementation those skilled in the art have grasped, and do not repeat herein.
First communication unit uses RS485 communication unit, and second communication unit uses RS232 communication unit,
The parameters such as address, the baud rate of high-voltage electric-energy meter are set in host computer interface, RS232 communication unit receives host computer
The order such as debugging, setting, high-voltage electric-energy meter address, and store in the data store, to guarantee the steady of data
Qualitative, data storage cell uses power down nonvolatile memory EEROM.
MCU processing unit uses the LPC1768 series monolithic of NXP company, including all hardware to initialize, may be programmed and patrol
The software download and all communication for collecting array FPGA and digital signal processor DSP are handled with I/O mouthfuls of number；Data acquisition and
Electrical energy measurement unit includes 16 multi-channel high-speed A/D converters and metering plate, and current switching compensating unit passes through 16 multi-pass
Road high-speed a/d converter is connected to metering plate, and high tension voltage sampling loop is connected directly to metering plate.
Compared with prior art, the utility model has the following beneficial effects:
The measuring accuracy of the utility model raising high-voltage electric-energy meter, it is ensured that the fairness of electrical energy measurement.According to height
The error characteristics curve of pressure electric energy metering device is segmented electric current, judges work segment limit according to its load operating conditions,
The paragraph compensation of error is carried out automatically by current switching compensating unit, and can be communicated by serial mode with host computer, is applicable in
In high-voltage electric energy meter, Intelligent high-pressure switch, high-voltage current sensor, high-voltage voltage sensors, mutual inductor, electric energy meter etc. are various
High-voltage electric energy measurement equipment improves its error linear degree, improves measuring accuracy, fills up technological gap.
Detailed description of the invention
Fig. 1 is 1 schematic diagram of embodiment.
Specific embodiment
The utility model embodiment is described further with reference to the accompanying drawing:
Embodiment 1:
As shown in Figure 1, the high-voltage electric-energy meter high-accuracy compensation system, including data acquisition and electrical energy measurement list
Member, the first communication unit, MCU processing unit, current switching compensating unit, the second communication unit and host computer, wherein
Current switching compensating unit realizes the error compensation of high-voltage electric-energy meter current signal；
Data acquisition and electrical energy measurement unit, for acquiring each phase voltage, the electric current of high-voltage electric energy measurement equipment, high-voltage electricity
The high-tension current sampling loop of energy metering device is connected to data acquisition and electrical energy measurement unit by current switching compensating unit,
The high tension voltage sampling loop of high-voltage electric-energy meter is connected directly to data acquisition and electrical energy measurement unit；
First communication unit realizes data acquisition and the communication of electrical energy measurement unit and MCU processing unit；
Second communication unit realizes the communication of host computer and MCU processing unit；
The compensating parameter of current switching compensating unit is sent to MCU processing unit by host computer；
MCU processing unit receives and processes the information that data processing unit and host computer are sent, is controlled according to processing result
The movement of current switching compensating unit；
Data storage cell, for storing the received data of MCU processing unit.
Wherein, current switching compensating unit includes the RLC compensation circuit and the direct-connected circuit of a way switch of 8 tunnels parallel connection, described
RLC compensation circuit includes in parallel resistance all the way and capacitor (according to actual needs, the inductance of also settable parallel connection all the way) all the way,
Resistance/appearance of every road RLC compensation circuit passes through driving triode respectively and is connected to MCU processing unit, and driveing triode tube base connects
The I/O mouth of MCU processing unit is connect, driving triode emitter connects resistance/appearance of RC compensation circuit, driving triode collector
External power supply is connected, switching direct-connected circuit only includes a driving triode, switchs the driving triode emitter of direct-connected circuit
It is connected to data acquisition and electrical energy measurement unit, is such as not required to compensate, directly by switching direct-connected circuit connection high-tension current sampling
Circuit and data acquisition and electrical energy measurement unit.
The host computer is equipped with switching compensation control unit, switching compensation control unit corresponding current switching compensating unit
A control button is respectively set in every road resistance and every road capacitor, is realized by the operation of control button and compensates list to current switching
The switching control of the resistance and capacitor of member, control button can be software realization can also be with hardware realization, two kinds of implementation sheets
Field technical staff has grasped, and does not repeat herein.
First communication unit uses RS485 communication unit, and second communication unit uses RS232 communication unit,
The parameters such as address, the baud rate of high-voltage electric-energy meter are set in host computer interface, RS232 communication unit receives host computer
The order such as debugging, setting, high-voltage electric-energy meter address, and store in the data store, to guarantee the steady of data
Qualitative, data storage cell uses power down nonvolatile memory EEROM.
MCU processing unit uses the LPC1768 series monolithic of NXP company, including all hardware to initialize, may be programmed and patrol
The software download and all communication for collecting array FPGA and digital signal processor DSP are handled with I/O mouthfuls of number；Data acquisition and
Electrical energy measurement unit includes 16 multi-channel high-speed A/D converters and metering plate, and current switching compensating unit passes through 16 multi-pass
Road high-speed a/d converter is connected to metering plate, and high tension voltage sampling loop is connected directly to metering plate.
Above system further includes voltage switching compensating unit, the high tension voltage sampling loop of the high-voltage electric-energy meter
Switch compensating unit by voltage and be connected to data acquisition and electrical energy measurement unit, it includes that 8 tunnels are in parallel that voltage, which switches compensating unit,
RLC compensation circuit and the direct-connected circuit of a way switch, the RLC compensation circuit include in parallel resistance all the way and capacitor all the way
(according to actual needs, the inductance of also settable parallel connection all the way), resistance/appearance of every road RLC compensation circuit passes through driving three respectively
Pole pipe is connected to MCU processing unit, and driveing triode tube base connects the I/O mouth of MCU processing unit, and driving triode emitter connects
Resistance/appearance of RC compensation circuit is connect, driving triode collector connects external power supply, and switching direct-connected circuit only includes a driving
Triode, the driving triode emitter for switching direct-connected circuit are connected to data acquisition and electrical energy measurement unit, are such as not required to compensate,
Directly by switching direct-connected circuit connection high voltage power supply sampling loop and data acquisition and electrical energy measurement unit；The switching of host computer
The every of compensation control unit corresponding voltage switching compensating unit is respectively provided with a control button all the way.
Utility model works process is as follows:
Firstly, M current segmenting and each electric current is arranged according to the current error characteristic curve of high-voltage electric-energy meter
The range of segmentation takes 5 with M, for high-voltage electric-energy meter maximum operating currenbt 500A, the 1st current segmenting 0-110A (packet
Containing), the 2nd current segmenting 110A (does not include) -220A (including), and the 3rd current segmenting 220A (does not include) -330A (packet
Containing), the 4th current segmenting 330A (does not include) -420A (including), and the 5th current segmenting 420A (does not include) -500A (packet
Containing)；Above-mentioned current segmenting data are sent to MCU processing unit by host computer, and data acquisition and electrical energy measurement unit acquire in real time
Each phase voltage of high-voltage electric-energy meter, electric current are simultaneously sent to MCU processing unit for data are acquired by the first communication unit,
The electric current of high-voltage electric-energy meter acquisition is by taking 300A as an example；MCU processing unit is by the high-voltage electric-energy meter received
Each phase voltage, current data are compared with aforementioned currents segment data, judge that high-voltage electric-energy meter actual current is in
Third current segmenting controls the movement of switching compensating unit according to judging result, realizes error compensation.
It is main according to the error information for being high-voltage electric-energy meter when current segmenting data are set, by surveying high pressure
After the actual error of each operating current of electric energy metering device, the meter that allows in each load section referring to high-voltage electric-energy meter
It measures error range and carries out equitable subsection.
The host computer includes both of which, is respectively as follows:
Debugging mode:, can be according to 5 current segmentings difference simulated high-pressure electrical energy measurement dress that step S1 is arranged under the mode
Set the working condition of each current segmenting, and obtain high-voltage electric-energy meter error (error directly by standard scale measure
Obtain), the switching compensation control unit being equipped with by host computer adjusts the throwing of current switching compensating unit each road resistance and capacitor
State is cut, until realizing the target compensation value of high-voltage electric-energy meter error, stores high-voltage electric-energy meter current flow
The switching state of each road resistance capacitance of current switching compensating unit under parameter, it is relatively stable to obtain as switching foundation
The switching state of switching foundation, each road resistance capacitance of current switching compensating unit can be attempted repeatedly, with optimal compensation knot
Fruit is as switching foundation；
Compensation model: under the mode, data acquisition and electrical energy measurement unit obtain high-voltage electric-energy meter currently each phase
After voltage, electric current, electric current locating for high-voltage electric-energy meter current flow is judged according to the step S1 current segmenting data being arranged
Segmentation, according to the switching stored under host computer debugging mode according to the throwing for judging current switching compensating unit each road resistance and capacitor
Movement is cut, and corresponding control instruction is sent to current switching compensating unit by switching compensation control unit.
The computer program that the above process relies on belongs to technology well known to those skilled in the art, is not belonging to the utility model and changes
Into content.
Claims (6)
1. a kind of high-voltage electric-energy meter high-accuracy compensation system, which is characterized in that including data acquisition and electrical energy measurement list
Member, the first communication unit, MCU processing unit, current switching compensating unit, the second communication unit and host computer, wherein
Current switching compensating unit realizes the error compensation of high-voltage electric-energy meter current signal；
Data acquisition and electrical energy measurement unit, for acquiring each phase voltage, the electric current of high-voltage electric energy measurement equipment, high voltage electric energy meter
The high-tension current sampling loop for measuring device is connected to data acquisition and electrical energy measurement unit, high pressure by current switching compensating unit
The high tension voltage sampling loop of electric energy metering device is connected to data acquisition and electrical energy measurement unit；
First communication unit realizes data acquisition and the communication of electrical energy measurement unit and MCU processing unit；
Second communication unit realizes the communication of host computer and MCU processing unit；
The compensating parameter of current switching compensating unit is sent to MCU processing unit by host computer；
MCU processing unit, receives and processes the information that data processing unit and host computer are sent, and controls electric current according to processing result
Switch the movement of compensating unit；
Data storage cell, for storing the received data of MCU processing unit.
2. high-voltage electric-energy meter high-accuracy compensation system according to claim 1, which is characterized in that further include voltage
Switch compensating unit, the high tension voltage sampling loop of the high-voltage electric-energy meter switches compensating unit by voltage and is connected to
Data acquisition and electrical energy measurement unit.
3. high-voltage electric-energy meter high-accuracy compensation system according to claim 1 or 2, which is characterized in that the electricity
Stream switching compensating unit includes multichannel RLC compensation circuit and the direct-connected circuit of a way switch in parallel.
4. high-voltage electric-energy meter high-accuracy compensation system according to claim 2, which is characterized in that the voltage is cut
Changing compensating unit includes multichannel RLC compensation circuit and the direct-connected circuit of a way switch in parallel.
5. high-voltage electric-energy meter high-accuracy compensation system according to claim 2, which is characterized in that the host computer
Control unit is compensated equipped with switching, switching compensation control unit corresponding current switching compensating unit and voltage switch compensating unit
Per a control button is respectively provided with all the way, is realized by the operation of control button and current switching compensating unit and voltage switching are mended
Repay the switching control of each circuit component of unit.
6. high-voltage electric-energy meter high-accuracy compensation system according to claim 1, which is characterized in that described first is logical
Believe that unit uses RS485 communication unit, second communication unit uses RS232 communication unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061290A (en) * | 2018-10-12 | 2018-12-21 | 山东计保电气有限公司 | High-voltage electric-energy meter high-accuracy compensation system and compensation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061290A (en) * | 2018-10-12 | 2018-12-21 | 山东计保电气有限公司 | High-voltage electric-energy meter high-accuracy compensation system and compensation method |
| CN109061290B (en) * | 2018-10-12 | 2024-02-20 | 山东计保电气有限公司 | High-precision compensation system and compensation method for high-voltage electric energy metering device |
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