CN107422156B - Dynamic distortion power source based on high-speed DMA fitting - Google Patents
Dynamic distortion power source based on high-speed DMA fitting Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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Abstract
The embodiment of the invention discloses a dynamic distortion power source based on high-speed DMA fitting, which is used for solving the technical problems that a testing instrument or a system of an electric energy meter cannot generate nonlinear waveforms such as spike waves, voltage multiple zero crossing waveforms and the like in the prior art, and the measurement accuracy of the testing instrument cannot be checked under the fluctuation load due to the fact that a standard electric energy meter mode is used as a measurement standard. The embodiment of the invention comprises the following steps: the device comprises a RAM, a DMA controller, a dual-channel digital-to-analog converter and a power amplifier, wherein the RAM stores preset waveforms of various cycles; the RAM, the DMA controller, the dual-channel digital-to-analog converter and the power amplifier are sequentially connected, and the DMA controller is used for automatically and circularly transmitting the waveforms of all the cycles in the RAM to the dual-channel digital-to-analog converter according to the recording sequence of the waveforms to perform waveform fitting; the power amplifier is used for amplifying and outputting the waveform after fitting.
Description
Technical Field
The invention relates to the technical field of electrical measuring instruments and meters, in particular to a dynamic distortion power source based on high-speed DMA fitting.
Background
With the development of power electronic technology and the application of the power electronic technology in various industries, the capacity of a converter device in modern industrial production equipment is larger and larger, the quantity is larger and larger, the load of a power grid under the actual running condition is often not steady, the distortion is larger and larger, the fluctuation rule is not uniform, the test condition of the traditional electric energy meter generally requires a steady-state power source, the metering precision under the fluctuation load is often not checked, and the load under the actual running condition is often not steady, which possibly causes the following conditions: the electric energy meter is qualified in laboratory first inspection, unqualified in inspection after net hanging operation, and qualified in inspection after being detached and sent to the laboratory. The accuracy of the electrical energy metering data directly affects the interest between the grid enterprise and the user and the rationality of the transaction. Therefore, the industry-related standard suggests that the testing of the electric energy meter needs to be added with nonlinear testing waveforms, especially voltage multiple zero crossing waveforms, spike waveforms and other testing waveforms, and the waveforms are not provided with professional testing instruments at home and abroad at present, so that the nonlinear load testing problem can not be solved in the current electric energy industry.
The current electric energy meter is tested by using single-phase and three-phase power sources or single-phase and three-phase standard electric energy meters, the technology is mature and widely applied, the accuracy of the electric energy meter to be tested is calibrated by using the single-phase and three-phase standard electric energy meters as standards, and the scheme has the advantages of low design difficulty, low cost and mature technology and has the defect of incapability of testing electric energy errors under dynamic distortion load. A vector measurement calibration system FLUKE 6105 manufactured by the FLUKE company can test the error of the electric energy meter under integer harmonic, but cannot generate nonlinear waveforms (fourier incomplete decomposition waveforms) such as spike wave, voltage multiple zero crossing waveforms, and the like.
Disclosure of Invention
The embodiment of the invention discloses a dynamic distortion power source based on high-speed DMA fitting, which solves the technical problems that a testing instrument or a system of an electric energy meter cannot generate nonlinear waveforms such as spike waves, voltage multiple zero crossing waveforms and the like in the prior art, and the measurement accuracy of the testing instrument cannot be checked under the fluctuation load due to the fact that a standard electric energy meter mode is used as a measurement standard.
The embodiment of the invention provides a dynamic distortion power source based on high-speed DMA fitting, which comprises the following components:
the device comprises a RAM, a DMA controller, a dual-channel digital-to-analog converter and a power amplifier, wherein the RAM stores preset waveforms of various cycles;
the RAM, the DMA controller, the dual-channel digital-to-analog converter and the power amplifier are sequentially connected, and the DMA controller is used for automatically and circularly transmitting the waveforms of all the cycles in the RAM to the dual-channel digital-to-analog converter according to the recording sequence of the waveforms to perform waveform fitting;
the power amplifier is used for amplifying and outputting the waveform after fitting.
Alternatively, the DMA controller is connected to the RAM through a DMA bus.
Optionally, the RAM is also connected to a DSP Core via a bus.
Optionally, the DSP Core is further connected with a processing terminal, and the processing terminal is used for downloading the pre-generated cyclic waveform to the RAM through the DSP Core.
Optionally, the processing terminal is connected with the DSP Core through an Ethernet physical layer;
the Ethernet physical layer is connected with the DSP Core through a bus.
Optionally, the DMA controller is connected to the dual channel digital-to-analog converter through a synchronous serial port.
Optionally, the power amplifier comprises a current power amplifier and a voltage power amplifier;
the current power amplifier is connected with an A channel of the two-channel digital-to-analog converter;
the voltage power amplifier is connected with the B channel of the two-channel digital-to-analog converter.
Alternatively, the dual channel digital to analog converter is a 16 byte dual channel digital to analog converter.
From the above technical solutions, the embodiment of the present invention has the following advantages:
the embodiment of the invention provides a dynamic distortion power source based on high-speed DMA fitting, which comprises the following components: the device comprises a RAM, a DMA controller, a dual-channel digital-to-analog converter and a power amplifier, wherein the RAM stores preset waveforms of various cycles; the RAM, the DMA controller, the dual-channel digital-to-analog converter and the power amplifier are sequentially connected, and the DMA controller is used for automatically and circularly transmitting the waveforms of all the cycles in the RAM to the dual-channel digital-to-analog converter according to the recording sequence of the waveforms to perform waveform fitting; the power amplifier is used for amplifying and outputting the waveform after fitting. In the embodiment, the waveforms of each cycle, including nonlinear waveforms such as distorted waveforms and recorded waveforms, are stored in the RAM in advance, the waveforms of the RAM are automatically circulated to the dual-channel digital-to-analog converter by the high-speed DMA controller to complete fitting of arbitrary waveforms and amplified and output by the power amplifier, so that various waveform outputs including dynamic distorted nonlinear waveforms are obtained, testing and calibration of dynamic distortion loads are realized, and the technical problem that nonlinear waveforms such as spike waveforms, voltage multiple zero crossing waveforms and the like cannot be generated by a testing instrument or a system of an electric energy meter in the prior art is solved, and the measuring precision of the testing instrument cannot be checked under the fluctuation load due to the fact that a standard electric energy meter mode is used by a measuring standard.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of one embodiment of a dynamic distortion power source based on high speed DMA fitting provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a dynamic distortion power source based on high speed DMA fitting provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an automatic DMA transmission process of a dynamic distortion power source based on high-speed DMA fitting according to an embodiment of the present invention;
FIG. 4 (a) is a schematic diagram of DMA address bits of a dynamic distortion power source based on high-speed DMA fitting according to an embodiment of the present invention;
fig. 4 (b) is a schematic diagram illustrating DMA channel control switching of a dynamic distortion power source based on high-speed DMA fitting according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a dynamic distortion power source based on high-speed DMA fitting, which is used for solving the technical problems that a testing instrument or a system of an electric energy meter cannot generate nonlinear waveforms such as spike waves, voltage multiple zero crossing waveforms and the like in the prior art, and the measurement accuracy of the testing instrument cannot be checked under the fluctuation load due to the fact that a standard electric energy meter mode is used as a measurement standard.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, an embodiment of a dynamic distortion power source based on high-speed DMA fitting according to an embodiment of the present invention includes:
RAM1, DMA controller 2, binary channels D/A converter 3, power amplifier 4, RAM1 stores the waveform of each preset cycle;
the RAM1, the DMA controller 2, the dual-channel digital-to-analog converter 3 and the power amplifier 4 are sequentially connected, and the DMA controller 2 is used for automatically and circularly transmitting the waveforms of all the cycles in the RAM1 to the dual-channel digital-to-analog converter 3 according to the recording sequence of the waveforms to perform waveform fitting;
the power amplifier 4 is used to amplify and output the fitted waveform.
The number of the DMA controller 2, the dual-channel digital-to-analog converter 3, and the power amplifier 4 is not particularly limited, and can be selected according to actual needs, so as to satisfy the corresponding connection relationship of 1:1:2.
Further, the DMA controller 2 is connected to the RAM1 through a DMA bus.
Further, the RAM1 is also connected to a DSP Core5 via a bus.
Further, the DSP Core5 is also connected with a processing terminal 6, and the processing terminal 6 is used for downloading the pre-generated cyclic waveform to the RAM1 through the DSP Core5.
Further, the processing terminal 6 is connected with the DSP Core5 through the ethernet physical layer 7;
the Ethernet physical layer 7 is connected with the DSP Core5 through a bus.
Further, the DMA controller 2 is connected with the dual-channel digital-to-analog converter through a synchronous serial port.
Further, the power amplifier 4 includes a current power amplifier and a voltage power amplifier;
the current power amplifier is connected with an A channel of the two-channel digital-to-analog converter 3;
the voltage power amplifier is connected with the B channel of the two-channel digital-to-analog converter 3.
Further, the dual-channel digital-to-analog converter 3 is a 16-byte dual-channel digital-to-analog converter.
The above is a detailed description of the structure of a dynamic distortion power source based on high-speed DMA fitting provided by the embodiment of the present invention, and the following describes in detail the specific working principle of a dynamic distortion power source based on high-speed DMA fitting provided by the embodiment of the present invention.
Referring to fig. 2, in the present invention, the processing terminal 6, such as a computer, a notebook computer, an intelligent processing terminal, etc., downloads each cycle waveform (including Ua, ia, ub, ib, uc, ic channels) into the RAM1 through the ethernet physical layer 7 and the DSP Core5, and it should be noted that the waveform of each cycle on the processing terminal 6 may be generated by calculation with a MATLAB tool or by manual fitting, or may be generated by actual recording on site with an oscilloscope or a recorder. The speed of the processing terminal 6 for downloading the waveform to the RAM1 is determined by the speed of the ethernet and the speed of the DSP Core5, after the processing terminal 6 downloads the waveform to the RAM1, the DSP Core5 starts the first DMA controller 2a, the second DMA controller 2b and the third DMA controller 2c, and automatically sends the waveform of the RAM1 to the first dual-channel digital-to-analog converter 3a, the second dual-channel digital-to-analog converter 3b and the third digital-to-analog converter 3c through the first DMA controller 2a, the second DMA controller 2b, the third DMA controller 2c and the first synchronous serial port 8a, the second synchronous serial port 8b and the third synchronous serial port 8c to realize waveform fitting output of distortion load, and after the waveform fitting output, the waveform fitting output realizes waveform output of signal amplification and load power Ic through the first voltage power amplifier 4Ua, the first current power amplifier 4Ua, the second current power amplifier 4Ib and the third voltage power amplifier 4Uc and the third current power amplifier 4 Ic. Among them, the DSP processor 9 uses an ADSP-BF609Blackfin processor, which has the ethernet physical layer 7 and the first synchronization serial port 8a, the second synchronization serial port 8b, the third synchronization serial port 8c, the DSP Core5, and the first DMA controller 2a, the second DMA controller 2b, and the third DMA controller 2c built therein. The DSP processor 9 can realize automatic transmission of the data of the RAM1 according to the waveform of 80000 points of the weekly wave without intervention of the DSP Core5.
In the invention, random waveform (including distorted waveform or wave recording) is sent to the RAM1 through a low-speed network interface by the processing terminal 6, then the waveform of the RAM1 is automatically and circularly sent to the dual-channel digital-to-analog converter 3 by the high-speed DMA controller 2 to finish fitting of the random waveform, and the DMA controller 2 is used for automatic control, so that the waveform fitting output of 80000 points per cycle is realized without consuming DSP Core5, and the waveform fitting output can be accurately output through the high resolution of the dual-channel digital-to-analog converter 3. The dual-channel digital-to-analog converter 3 is realized by using an AD5545 chip with 16BIT, the switching of the two channels is realized by using address BITs input by the AD5545 chip, the first voltage power amplifier 4Ua, the second voltage power amplifier 4Ub and the third voltage power amplifier 4Uc are realized by using serial negative feedback through a power supply operational amplifier, the AC/DC output can be realized, the bandwidth is larger than 1MHz, the output of AC 100V can be realized by +/-200V of a working power supply, the maximum output current of the first current power amplifier 4Ia, the second current power amplifier 4Ib and the third current power amplifier 4Ic is 15A, and the output of the AC/DC 10A can be realized.
In the process of automatic transmission of waveforms by the DMA controller 2 in the present invention, as shown in fig. 3, the first DAM controller 2a controls the address of the RAM1 to be automatically and circularly transmitted from address 1 to address 80000 x 2 (two channels of Ua and Ia), the effective BIT number of the RAM waveform of each sampling point is 18BIT, the first two BITs are address BITs, and are used for selecting the a channel or the B channel of the first dual-channel digital-analog converter 3a, the last 16BIT is the waveform value of each sampling point, and the staggered storage sequence of the waveforms of Ua and Ia is as follows: ua1, ia1, ua2, ia.. Ua80000, ia80000, ub80000, RAM address of the second DAM controller 2B is automatically and circularly transmitted in sequence from address 1 to address 80000 x 2 (two channels Ub and Ib), the effective BIT number of the RAM waveform of each sampling point is 18BIT, the first two BITs are address BITs for selecting the A channel or B channel of the second two-channel digital-analog converter 3B, the latter 16BIT is the waveform value of each sampling point, the waveform stagger storage sequence of Ub and Ib is Ub1, ib1, ub2, ib.. Ub80000, ib80000, the RAM address of the third DAM controller 2c is automatically and circularly transmitted in sequence from address 1 to address 80000 x 2 (two channels Uc and Ic), the effective BIT number of the RAM waveform of each sampling point is 18BIT, the first two BITs are address BITs for selecting the A channel or B channel of the third two-channel digital-analog converter 3c, the latter 16BIT is the waveform stagger storage sequence of each sampling point is Uc1, uc and Uc is 80, uc and Uc is the waveform stagger storage sequence of Uc1, uc and Uc800, uc is 800, and IC is 800.
As shown in fig. 4 (a) to 4 (b), the DMA automatic control channel switching output of the present invention is that the high-order address bits of the RAM1 storing the sample value of Ua are: a1 is 1, A0 is 0; the high-order address bits for storing the Ia sampling points are as follows: a1 is 0, A0 is 1; the 16Bit value of the sampling value stored in Ua is D15-D0, the 16Bit value of the sampling value stored in Ia is D15-D0, and the principles of the channel B and the channel C are the same as those of the channel A. Specifically, as shown in fig. 4, the DMA controller 2a outputs the highest bit and the next highest bit A0 as #01b when outputting the sampling point 1 (Ua), and outputs the highest bit and the next highest bit A0 as #10b when outputting the sampling point 1 (Ia), so that the following waveform automatically selects whether the D/a (3 a) is the a channel or the B channel as long as the address positions are (1 < < 16) and (2 < < 16) in advance in the RAM area. The UB and IC and UC and IC operate exactly as UAIA.
The embodiment of the invention provides a dynamic distortion power source based on high-speed DMA fitting, which comprises the following components: RAM, DMA controller, dual channel digital to analog converter, power amplifier; the RAM, the DMA controller, the dual-channel digital-to-analog converter and the power amplifier are sequentially connected, and the DMA controller is used for automatically and circularly transmitting the waveforms of all the cycles in the RAM to the dual-channel digital-to-analog converter according to the recording sequence of the waveforms to perform waveform fitting; the power amplifier is used for amplifying and outputting the waveform after fitting. In the embodiment, the waveforms of each cycle, including nonlinear waveforms such as distorted waveforms and recorded waveforms, are stored in the RAM in advance, the waveforms of the RAM are automatically circulated to the dual-channel digital-to-analog converter by the high-speed DMA controller to complete fitting of arbitrary waveforms and amplified and output by the power amplifier, so that various waveform outputs including dynamic distorted nonlinear waveforms are obtained, testing and calibration of dynamic distortion loads are realized, and the technical problem that nonlinear waveforms such as spike waveforms, voltage multiple zero crossing waveforms and the like cannot be generated by a testing instrument or a system of an electric energy meter in the prior art is solved, and the measuring precision of the testing instrument cannot be checked under the fluctuation load due to the fact that a standard electric energy meter mode is used by a measuring standard.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A dynamic distortion power source based on high speed DMA fitting, comprising:
the device comprises a RAM, a DMA controller, a dual-channel digital-to-analog converter and a power amplifier, wherein the RAM stores preset waveforms of all the cycles;
the waveform of each cycle includes: a voltage Ua channel, a current Ia channel;
the RAM, the DMA controller, the dual-channel digital-to-analog converter and the power amplifier are sequentially connected, and the DMA controller is used for automatically and circularly transmitting waveforms of all the cycles in the RAM to the dual-channel digital-to-analog converter according to the recording sequence of the waveforms to fit the waveforms;
the power amplifier is used for amplifying and outputting the waveform after fitting;
the power amplifier comprises a current power amplifier and a voltage power amplifier;
the current power amplifier is connected with an A channel of the two-channel digital-to-analog converter;
the voltage power amplifier is connected with a B channel of the two-channel digital-to-analog converter;
the first two address bits of the RAM waveform are used for selecting an A channel or a B channel of the dual-channel digital-to-analog converter, and the RAM addresses are alternately sequenced and output in the voltage Ua and the current Ia;
the first two address bits of the RAM waveform are used to select an a channel or a B channel of the dual-channel digital-to-analog converter, and RAM addresses are alternately sequenced and output in the two channels of the voltage Ua and the current Ia, specifically: the DAM controller controls the addresses of the RAM to be transmitted from address 1 to address 80000 x 2, namely, the addresses are automatically and circularly transmitted in sequence in two channels of the voltage Ua and the current Ia, the effective BIT number of the waveform of the RAM at each sampling point is 18BIT, the first two BITs are address BITs used for selecting an A channel or a B channel of the dual-channel digital-analog converter, the last 16BIT is the waveform value of each sampling point, and the waveform staggering storage sequence of the voltage Ua and the current Ia is Ual, ial, ua, ia2 to Ua80000, ia 00.
2. The high speed DMA fitting based dynamic distortion power source of claim 1 wherein the DMA controller is connected to the RAM by a DMA bus.
3. A high speed DMA fitting based dynamic distortion power source as set forth in claim 1 wherein the RAM is further connected to a DSP Core through a bus.
4. A high speed DMA fitting based dynamic distortion power source as set forth in claim 3 wherein said DSP Core is further connected with a processing terminal for downloading pre-generated cyclic waveforms through said DSP Core to said RAM.
5. The high speed DMA fitting based dynamic distortion power source of claim 4, wherein the processing terminal is connected to the DSP Core through an ethernet physical layer;
the Ethernet physical layer is connected with the DSP Core through a bus.
6. The high-speed DMA fitting based dynamic distortion power source of claim 1, wherein the DMA controller is connected to the dual channel digital-to-analog converter through a synchronous serial port.
7. The high-speed DMA fitting based dynamic distortion power source of claim 1, wherein the dual channel digital-to-analog converter is a 16 byte dual channel digital-to-analog converter.
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| CN206930688U (en) * | 2017-06-21 | 2018-01-26 | 广东电网有限责任公司电力科学研究院 | A kind of dynamic distortion power source based on high speed DMA fitting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107561982A (en) * | 2017-08-29 | 2018-01-09 | 广东电网有限责任公司电力科学研究院 | A kind of arbitrarily signal generating device and its output control method based on terminal fitting |
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|---|---|---|---|---|
| US4791384A (en) * | 1984-02-15 | 1988-12-13 | Harris Corporation | Programmable function controller for use in a waveform generator system |
| CN203519678U (en) * | 2013-09-04 | 2014-04-02 | 国家电网公司 | High-precision three-phrase AC simulation source having zero passage synchronization PPS output |
| CN203465409U (en) * | 2013-09-27 | 2014-03-05 | 广东电网公司电力科学研究院 | Standard analog-digital synchronization signal source |
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