CN202141767U

CN202141767U - Multifunctional metering device capable of monitoring electric energy quality

Info

Publication number: CN202141767U
Application number: CN201120194055U
Authority: CN
Inventors: 潘立冬
Original assignee: HANGZHOU HUATAI ELECTRIC TECHNOLOGY Co Ltd
Current assignee: HANGZHOU HUATAI ELECTRIC TECHNOLOGY Co Ltd
Priority date: 2011-06-09
Filing date: 2011-06-09
Publication date: 2012-02-08
Anticipated expiration: 2021-06-09

Abstract

A multifunctional metering device capable of monitoring electric energy quality belongs to the field of electric energy quality monitoring technology, and characterized in comprising a communication unit with the TM320Vc5402 chip of the T1 company as the core, a current isolation module, a voltage isolation module, an A/D conversion module, an McBSP module, a central microprocessor chip and an auxiliary power supply, wherein the auxiliary power supply is communicated with the A/D conversion module, the McBSP module and the central microprocessor chip, a three-phase voltage/current is converted by the current isolation module and the voltage isolation module, a higher harmonic is filtered, and the three-phase voltage/current is sent to the A/D conversion module, the A/D conversion module sends a sampled digital signal to the McBSP module, and each realtime electricity parameter after processing by the McBSP module is sent to the central microprocessor chip for display through the communication unit. The multifunctional metering device is simple and compact in structure, the functions are complete, the operation is stable, and the implementation is easy.

Description

A kind of multifunctional metering device of monitoring the quality of power supply

Technical field

The utility model belongs to the electric energy quality monitoring technical field, is specifically related to a kind of electric energy quality monitoring and analyzing system of measuring in real time, exactly to each parameter in the electric system.

Background technology

The power quality measurement device of prior art to harmonic voltage fluctuation, flickering between monitoring, rise sharply, measurement such as rapid drawdown, temporary transient interruption, temporary overvoltage, instantaneous overvoltage are difficult to realization; China utility model patent CN2833607; Title " multi-function power meter " (open day is 2006-11-01) provides a kind of multi-function power meter; Be used to measure load electric degree parameter, it comprises the digital signal processing module that decomposes and the positive and negative direction active electrical degree and the idle electric degree of first-harmonic, each harmonic are measured, calculated to analog alternating current signal sampling and analog-to-digital data acquisition module, to the harmonic signal in the data acquisition module; Contain the microprocessor module that clock, serial ports and LCD show control.The accurate measurement at times of this gauge improves the quality of power supply, but the measurement of concrete parameter is inconvenient, has limited its application.

Summary of the invention

For overcoming the deficiency of above-mentioned existence; The utility model purpose is to provide a kind of raising quality of power supply; The power quality parameter index is monitored accurately and analyzed, to the measuring in real time, exactly of each parameter in the electric system, easy to operate, have real-time, accuracy and rapidity Can monitor the multifunctional metering device of the quality of power supply

For realizing the utility model purpose, adopt following technical scheme to realize:

Originally the purpose that can monitor is to adopt following technical scheme to realize.

A kind of multifunctional metering device of monitoring the quality of power supply; The TMS320VC5402 chip that it is characterized in that comprising TI company is communication unit, electric current isolation module, the voltage isolation module of core, 16 multi-channel serial output A/D modular converters, McBSP module, with 16 low-power scm MSP430F149 be core central microprocessor chip and accessory power supply; The demonstration output terminal of said central microprocessor chip is used to show the display device that detects data through panel interface is external; The monitoring client of said central microprocessor chip is connected with switching value output load module through PLD; Said accessory power supply is communicated with A/D modular converter, McBSP module and central microprocessor chip; Three-phase voltage/electric current is the filtering higher hamonic wave after excess current isolation module, voltage isolation module converts; Deliver to the A/D modular converter; The digital signal that the A/D modular converter will have been sampled is sent into the McBSP module, and the real-time electric parameter of each after the McBSP interface modules handle is given the central microprocessor chip through communication unit and shown.

The monitoring main website of the utility model multifunctional metering device communicates through network and on-Line Monitor Device, realizes functions such as the remote maintenance of monitoring device and electric energy quality monitoring data aggregation, processing, issues.The utility model multifunctional metering device is to the deficiency of prior art; Through fast fourier transform algorithm based on DSP, the software and hardware that device development relates to is made the part improvement, slave computer is made design again; Framework DSP (microprocessor)+MCU (multiple spot processing unit) scheme; After by DSP sampled data being done further anti-aliasing processing, calculate each parameters of electric power and carry out frequency analysis, and the parameter of needs is stored through fast Fourier algorithm.It is that the host computer of core shows that each real-time electric parameter after handling through DSP is given with MSP430F149 through communication unit.System design comprises keyboard input control circuit and LCD liquid crystal display circuit, realizes friendly, man-machine interface intuitively, can measuring voltage fluctuation, flickering, rise sharply, rapid drawdown, temporary transient interruption, temporary overvoltage, instantaneous overvoltage.

Said multifunctional metering device comprises keyboard input control circuit and input button, and button can be established 6, is respectively " menu ", " resetting ", " affirmation ", " ↑ ", " ↓ " and " returning ".

It is simple and compact for structure that the utility model can be monitored the multifunctional metering device of the quality of power supply, complete function, working stability, easy to implement, to the existing power quality problem of society monitor effectively, data analysis, to guarantee power grid security, economical operation.

Description of drawings

Fig. 1 can monitor the structured flowchart of the multifunctional metering device of the quality of power supply for the utility model;

Fig. 2 can monitor the electronic-circuit diagram of the multifunctional metering device of the quality of power supply for the utility model.

Embodiment

Come the utility model is further specified below in conjunction with specific embodiment, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained in claims scope all alternativess, improvement project and the equivalents that possibly comprise.

Embodiment 1

See Fig. 1 and Fig. 2,

In a kind of multifunctional metering device structure of monitoring the quality of power supply; The TMS320VC5402 chip that comprises TI company is communication unit, electric current isolation module, the voltage isolation module of core, 16 multi-channel serial output A/D modules 7, McBSP module 8, with 16 low-power scm MSP430F149 be core central microprocessor chip and accessory power supply 2; Said accessory power supply 2 is communicated with 16 multi-channel serial output A/D modules 7, McBSP module 8 and MSP430F149 modules 11; Three-phase voltage/electric current is delivered to 16 multi-channel serial output of AD73360 A/D modular converter 7 through accurate voltage current transformer (CT electric current isolation module 3 and PT voltage isolation module 4) conversion back filtering higher hamonic wave.The digital signal that A/D modular converter 7 will have been sampled is sent into McBSP module (DSP module) 8.It is that the central microprocessor chip (host computer) of core shows that each real-time electric parameter after handling through McBSP module 8 is given with MSP430F149 module 11 through communication unit TMS320VC5402 module 10.

In this device; A/D modular converter 7 (AD73360 module) is less demanding to the AFE(analog front end) wave filter; Adopt the difference input of AC coupling; McBSP interface through McBSP module 8 links to each other with TMS320VC5402 module 10, and the serial ports clock sclk signal of A/D modular converter 7 is as the tranmitting data register signal (CLKX0) and the receive clock signal (CLKR0) of McBSP module 8 interfaces; The transmission pin (FSX0) of McBSP module 8, the synchronous pin of received frame (FSR0) connect together with input pin (SDIFS), the output frame synchronous (SDOFS) of AD73360 module 7, make the transmission signal (FSX0) of McBSP module 8 and received frame synchronizing clock signals (FSR0) synchronous with output frame synchronizing signal (SDOFS) maintenance of AD73360 module.The data output pin (SDO) of A/D modular converter 7 sends pin (DX0) with the Data Receiving pin (DR0) of McBSP module 11 with data respectively with input pin (SDI) and links to each other.The activation signal SE of A/D modular converter 7 (AD73360) is triggered by the output frequency-doubled signal AD_SE of phase locking frequency multiplying circuit, realizes the genlock collection.The drive clock signal MCLK of A/D modular converter 7 (AD73360) can be obtained by the DSP frequency division, also can directly be produced by crystal oscillator, and the highest input clock of A/D modular converter 7 (AD73360) is 16.384 MHz.

TMS320VC5402 module 10 provides a HPI HPI, when TMS320VC5402 module 10 transmits data with main frame, and synthetic 16 figure places of 8 bit array that HPI can automatically transmit external interface continuously, and be sent to TMS320VC5402 module 10.

The utility model can be monitored the multifunctional metering device of the quality of power supply; Functions such as measurement, demonstration control and communication have been realized to each electric parameter that comprises three-phase current/voltage; System with accurate sampling be treated to the basis, take into account whole simplicity of design, factor such as with low cost.

Less demanding to the AFE(analog front end) wave filter adopt the principle of ∑-△ A/D conversion in the said A/D modular converter, have good built-in anti-aliasing performance, so just can meet the demands with single order RC low-pass filter.Its sampling rate and input signal gain all are programmable, and sampling rate can be set to 64 kS/s, 32 kS/s, 16 kS/s and 8 kS/s (when input clock is 16.384 MHz) respectively, and gain can be selected between 0 dB ~ 38 dB.AD73360 can guarantee that 6 tunnel simulating signals sample simultaneously, and in conversion process, postpones very little.AD73360 adopts the difference input of AC coupling in the native system, links to each other with TMS320VC5402 through the McBSP interface, and the number of interface signal line has only 6, and is simple and direct efficient.After sampled data is done further anti-aliasing processing by DSP; Calculate each parameters of electric power and carry out frequency analysis through fast Fourier algorithm; And the parameter of needs stored, it is that the host computer of core shows that each the real-time electric parameter after handling through DSP is given with MSP430F149 through communication unit.See that Fig. 1 MSP430F149 module 11 connects key-press module (keyboard input control circuit) and LCD liquid crystal indicator, realizes friendly, man-machine interface intuitively.

Claims

1. the multifunctional metering device that can monitor the quality of power supply; The TMS320VC5402 chip that it is characterized in that comprising TI company is communication unit, electric current isolation module, the voltage isolation module of core, 16 multi-channel serial output A/D modular converters, McBSP module, with 16 low-power scm MSP430F149 be core central microprocessor chip and accessory power supply; The demonstration output terminal of said central microprocessor chip is used to show the display device that detects data through panel interface is external; The monitoring client of said central microprocessor chip is connected with switching value output load module through PLD; Said accessory power supply is communicated with A/D modular converter, McBSP module and central microprocessor chip; Three-phase voltage/electric current is the filtering higher hamonic wave after excess current isolation module, voltage isolation module converts; Deliver to the A/D modular converter; The digital signal that the A/D modular converter will have been sampled is sent into the McBSP module, and the real-time electric parameter of each after the McBSP interface modules handle is given the central microprocessor chip through communication unit and shown.