CN201156058Y - Intelligent electric energy quality analyzer - Google Patents

Abstract

The utility model discloses an intelligent power quality analysis meter, which belongs to the electric network power quality detection field. The intelligent power quality analysis meter is composed of an analogue board, a core board, an interface board and a power supply module; wherein, a microporocessor module is arranged on a core module, and a power quality analysis soft wire at the inner part comprises a communication sending and receiving program, a printer driver program and a flash memory equipment driver program. The intelligent power quality analysis meter can perform data communication with a remote supervisory computer or equipment in a wired way or a wireless way, to realize the remote supervisory or the network grouping, and can also realize the on-line upgrading of the system software through wired connection or wireless connection; the intelligent power quality analysis meter can print specific shape information or report, to be convenient for analysis. The intelligent power quality analysis meter can be used as an electric power indicating instrument, an electric network harmonic wave analysis meter, a power quality analysis meter and power metering equipment to be flexibly applied to each electric power automation field, thereby the operation and the management are convenient, and the secure operation is ensured.

Description

The intelligent power mass-synchrometer

Technical field:

The utility model patent belongs to the electrical network quality of power supply to be measured and analysis technical field, relates to electric harmonic analysis and electric energy metrical and quality evaluation.

Background technology:

Along with electronic technology, the development beyond example of Power Electronic Technique is as Switching Power Supply, silicon controlled rectifier, so non-linear power equipment such as frequency converter uses in large quantities, in energy-efficient, has brought very large interference to electrical network, harmonic wave particularly, between the emerge in multitude of harmonic wave etc., often make current in middle wire surpass the phase line current value, thereby cause very big loss for commercial production level equipment, as the equipment premature aging, thus the overheated fire etc. that causes of electrical network.Except that harmonic wave, the fluctuation of voltage and flickering etc. can pollute to electrical network equally to the influence of electrical network in addition, thereby influence the operate as normal of equipment.In order to detect and as early as possible discovery electrical network problem, reduce the loss, various countries have successively taked related measure, as mains by harmonics, the analytical instrument of various aspects such as voltage transient and flickering monitors the active situation of electrical network, and analysis and evaluation is comprehensively carried out in different activity and electric energy statistics.And the power grid quality measuring instrument that is occurred in the market is that frequency analysis instrument and electric energy measurement instrument are separate mostly, thereby different measuring accuracy is arranged, thereby causes the comprehensive assessment result accurate inadequately.Need frequency analysis function and electric energy metrical function are made in the same equipment for this reason.

Summary of the invention:

Fundamental purpose of the present utility model is the defective that solves existing frequency analysis instrument, and a kind of detection measuring instrument that integrates frequency analysis and electric energy metrical is provided.

For achieving the above object, the utility model has been taked following technical measures:

The utility model has designed a kind of intelligent power mass-synchrometer, it is characterized by circuit part and comprises analog board 10, DSP core board 20, interface board 30 and power panel 41.Each module links together by interface board 30, wherein, microprocessor module 21 is arranged on the DSP core board 20, and its inner power quality analysis software also comprises the communication transmitting/receiving program, printed driver and flash memory device driver;

Analog board 10 is made up of current sensor 11, isolation and protection module 12, filtering and amplification module 13, voltage sensor 14, isolation and protection module 15, filtering and amplification module 16 etc.; Current sensor 11 directly is connected with the external electrical network three-phase current signal, and voltage sensor 14 links to each other with the external electrical network three-phase voltage signal by the metalfilmresistor of 3W; The output of current sensor 11 and voltage sensor 14 links to each other with the input end of filtering amplification module 13 with filtering amplification module 16 with protection module 15 with isolation with protection module 12 by isolating respectively, and the output of filtering amplification module 13 and filtering amplification module 16 is the output signal of analog board 10;

DSP core board 20 is by microprocessor module 21, compositions such as power management module 22 and external SRAM 23; Wherein, described microprocessor module 21 is to have analog-to-digital conversion module 211, internal RAM, inner FLASH, input capture interface, communication interface able to programme and can carry out the digital signal processor that parallel interface extends out; Described power management module 22 directly by interface board and power panel 41+the 5V power supply links to each other, and should+the 5V power source conversion becomes microprocessor module 21 and the operable power supply of other parts; Described external SRAM links to each other with microprocessor module 21 by the outside parallel interface and the relevant control line of microprocessor module 21; The input of analog-to-digital conversion module 211 links to each other with the output of analog board 10 by interface board 30;

Level isolation module 31, real-time clock module 32, display unit 33, communication interface modules 34, keyboard 35, nonvolatile memory 36, power management module 37 and three-phase frequency detection module 38 are housed on the interface board 30.Described display unit 33 comprises LCD LCD interface and LED light; Wherein, LCD LCD interface is connected with LCD, and links to each other with data bus with the LCD control bus of microprocessor module 21 by level isolation module 31; LCD can show the three phase electric energy measurement data under the control of microprocessor module 21, various static graphics or dynamic menu, electric parameter measurement information, power monitoring information, the communication information etc.; Described keyboard 35 links to each other with the corresponding I interface of microprocessor module 21 by level isolation module 31.Described communication interface modules 34 links to each other with the pin relevant with communication of microprocessor module 21 by level isolation module 31; Wherein, communication interface modules 34 can be RS485 full duplex or half-duplex module, or CAN bus module, or ethernet interface module, or usb interface module, or the infrared communication interface module, or the blue tooth interface module, or GPRS/GSM module, or one or more combination of ZigBee interface module etc.Nonvolatile memory 36 is serial line interfaces of spi bus interface, links to each other with DSP core board 20 by level isolation module 31; Described power management module 37 is made up of power source special administration module IC and related peripheral circuit.The input of power management module 37 directly with power panel 41+the 5V power supply links to each other.Described three-phase frequency detection module 38 is after the output signal of filtering and amplification module 16 is carried out the shaping conditioning, directly to catch input pin with microprocessor module 21 and link to each other.

Through above-mentioned technological improvement, following advantage is arranged compared with prior art:

1, current collection can measure with power quality analysis in one, make the comprehensive assessment result more accurate;

2, printer interface can the field print analysis report, is convenient to on-the site analysis;

3, the network communication modular design both can be satisfied requirements of different users, was convenient to tissue production again.

Description of drawings:

Fig. 1 is the theory of constitution block diagram of the utility model intelligent power quality analysis meter.

Fig. 2 is the schematic block circuit diagram of the utility model intelligent power quality analysis meter.

Fig. 3 is the schematic block circuit diagram of the nucleus module of the utility model intelligent power quality analysis meter.

Fig. 4 is the schematic block circuit diagram of the interface board of the utility model intelligent power quality analysis meter.

Fig. 5 is the analog board theory diagram of the utility model intelligent power quality analysis meter.

Fig. 6 is the wherein circuit theory diagrams of a phase of the utility model three-phase frequency detection module

Fig. 7 is the filtering amplifying unit electrical schematic diagram of each phase current or voltage in the three-phase voltage electric current of the utility model intelligent power quality analysis meter.

131 are low-pass filter enforcement schematic diagram among Fig. 7, and 132 is that amplifier is implemented circuit theory diagrams.

Embodiment:

As Fig. 1, the intelligent power mass-synchrometer is by DSP core board 20, interface board 30, compositions such as analog board 10 and power panel 41; The intelligent power mass-synchrometer is a core with DSP core board 20, and DSP core board 20 is control centers of intelligent harmonic analyser.

As Fig. 3, DSP core board 20 is by microprocessor module 21, power management module 22 external SRAM module 23 compositions such as grade.Microprocessor module 21 is realized by dsp processor TMS320F2812 and necessary peripheral circuit thereof; Power management module 22 is made of power source special administration module chip TPS767D301 and related peripheral circuit, for little reason device module 21 and external SRAM 23 provide 3.3V and 1.9V power supply; External SRAM 23 realizes by the sram chip of 256kB and peripheral circuit, when being used for microprocessor at the ephemeral data of operational process or at system upgrade as the buffer zone of program upgrade.

As Fig. 4, interface board 30 is expansion board of intelligent power mass-synchrometer, is made up of functional modules such as level isolation module 31, real-time clock module 32, display unit 33, communication interface modules 34, keyboard 35, nonvolatile memory 36, power management module 37 and three-phase frequency detection module 38.Wherein, level isolation module 31 is made of bus driver chip and related peripheral components and parts, thereby can make interface board and core board that different power supply power supplies is arranged; Wherein, real-time clock module 32 is made of special use real-time timepiece chip DS1306EN able to programme and related peripheral components and parts; Wherein, display unit 33 comprises LCD MODULE and power supply, operation, and fault is reported to the police, and LED such as communication and printing indication and related peripheral components and parts are formed; LCD is that 320 * 240 Liquid Crystal Module and peripheral component are formed by resolution; Wherein, communication interface modules 34 comprises the RS485 full duplex, RS485 half-duplex, CAN bus module, Ethernet interface, usb interface module, blue tooth interface module and ZigBee interface module etc.Because the selected processor TMS320F2812 of this intelligent power mass-synchrometer has built-in two SCI interfaces on the sheet, a SPI interface and a CAN interface, so this intelligent harmonic electric energy analyser acquiescence is furnished with the RS485 full duplex, RS485 half-duplex, CAN interface and USB interface.Wherein, USB interface realizes that by special-purpose USB controller USB controller and processor communicate by the SPI interface, can be by ethernet interface module, or the infrared communication interface module, or blue tooth interface module, or one of them or several replacement such as GPRS/GSM module or ZigBee interface module.Wherein, power management module 37 is realized by special-purpose LDO power supply chip and peripheral component; Wherein, three-phase frequency detection module 38 is by carrying out filtering to three-phase voltage signal, and shaping realizes that its principle as shown in Figure 6.Among Fig. 6, R1 and RP form bleeder circuit, wherein the tie point of R1 and RP is the dividing potential drop output node, this node directly links to each other with the end of oppisite phase of comparer N, sine wave signal imports comparer N by R1, the output of comparer N is the square-wave signal through conditioning, and the input capture pin of processor module 21 will be directly sent in this output;

As Fig. 5, analog board 10 is that electrical network three-phase voltage electric current is sampled by voltage transformer (VT) 14 summation current transformers 11, and through amplitude limit, gives core board after a series of processing such as filtering and amplification and carry out AD conversion and related operation.

As shown in Figure 7, (131) are the low-pass filter circuit schematic diagram, and by R1, it is as follows that R2, C1, C2, C3 form the selection of its parameter:

$f=\frac{1}{2\mathrm{\&pi;R}(2{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="Y20072030345900121.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+C)}$

Wherein:

F: low pass filter cutoff frequency; R=R ₁=R ₂C=C ₂=C ₃

This analysis instrument need be surveyed 51 subharmonic, thereby cutoff frequency should be got at least:

f＝10×51×50Hz＝2550Hz。

Claims (4)

1. intelligent power mass-synchrometer, it comprises analog board (10), DSP core board (20), interface board (30) and power panel (41) are formed, it is characterized in that being equipped with on the analog board (10) current sensor (11), isolation and protection module (12), filtering and amplification module (13), voltage sensor (14), isolation and protection module (15), filtering and amplification module (16), current sensor (11) directly links to each other with the power network current signal, and voltage sensor (14) links to each other with the voltage signal of electrical network by the metalfilmresistor of 3W; The output of current sensor (11) and voltage sensor (14) links to each other with the input of filtering with amplification module (16) with amplification module (13) with filtering with protection module (15) with isolation with protection module (12) by isolating.

2. intelligent power mass-synchrometer according to claim 1, it is characterized in that on the described DSP core board (20), microprocessor module (21), power management module (22) and external SRAM (23) are housed, described power management module (22) is made up of power source special administration module IC and related peripheral circuit, and links to each other with power panel (41) by interface board (30).

3. intelligent power mass-synchrometer according to claim 2, it is characterized in that the analog-to-digital conversion module on the described microprocessor module (21) directly is connected with the output of three-phase current filtering amplification module (13) with three-phase voltage filtering amplification module (16), microprocessor module (21) is connected with a side signal upward identical with microprocessor module (21) supply voltage with the level isolation module (31) of interface board (30).

4. intelligent power mass-synchrometer according to claim 1, it is characterized in that being equipped with on the described interface board (30) level isolation module (31), real-time clock module (32), display unit (33), communication interface modules (34), keyboard (35), nonvolatile memory (36), power management module (37) and three-phase frequency detection module (38), level isolation module (31) and real-time clock module (32), display unit (33), communication interface modules (34), keyboard (35) links to each other with nonvolatile memory (36) and power supply thereof, level isolation module (31) opposite side links to each other with the relevant pin of core board (20) by the contact pin socket, described display unit (33) comprises LCD LCD interface and LED light, LCD LCD interface is connected with LCD, LCD can show the three phase electric energy measurement data by level isolation module (31) under the control of microprocessor module (21), various static graphics or dynamic menu, electric parameter measurement information, power monitoring information, the communication information, described communication interface modules (34) is the pluggable module of a rectangle, this module is plugged on interface board (30) by contact pin and goes up on the corresponding slot, described power management module (37) is made up of power source special administration module IC and related peripheral circuit, and the input of power management module (37) directly links to each other with power module (41) by connector; Described three-phase frequency detection module (38) is after the output signal of filtering and amplification module (16) is carried out signal condition, directly links with the relevant pin of microprocessor module (21).

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