CN103454493A - Power quality detection system and operation method thereof - Google Patents

Abstract

The invention discloses a power quality detection system and an operation method thereof and belongs to the field of electric power. The power quality detection system is composed of a data collecting module, a data processing module, a micro controller unit (MCU) man-machine interface module and a power module which are connected through signals. The power quality detection system has extremely high measuring speed and measuring accuracy, is friendly in man-machine interface, easy to operate and complete in functions, has expandability, facilitates system hardware and software upgrading and has extremely good practical value.

Description

Power Quality Detection system and method for operating thereof

Technical field

The present invention relates to power domain, particularly a kind of Power Quality Detection system and method for operating thereof.

Background technology

Development along with Power Electronic Technique, the complexity of electric system load has increased, rectifier, the various nonlinear loads such as frequency converter and electric arc furnaces are widely used in industrial and agricultural production and defeated consumer, what on line of electric force, transmit has been no longer pure 50Hz alternating current, and become the electric power system of the complexity that is comprising harmonic wave and various interference, these loads non-linear, impact and unbalancedness make the power supply quality of electrical network increasingly worsen, cause many stable states, the transient power quality problem, as surge disturbs, the high pressure spike disturbs, voltage falls and cataclysm, the harmonic effects of voltage, voltage fluctuation, three-phase imbalance etc., all these have brought many new problems, as a large amount of harmonic voltages and the harmonic current existed in electrical network can cause rotor overheated, cause system element to produce additional harmonic loss, reduce the service efficiency of consumer, reduction of service life, the deadlock that causes computing machine and Single Chip Microcomputer (SCM) system is disturbed in transition, also may cause that aut.eq., protective relaying device misoperation and commercial production electronic-controlled installation are malfunctioning, and important production run is interrupted, the power factor reduction causes loss to increase etc.These all problems will cause huge economic loss and industrial accident, produce serious potential safety hazard.

Based on above various factors, safe operation for electric system, electric power terminal user's safety utilization of electric power, and the requirement that reaches power equipment, more in order to reduce the wastage, improve power consumption efficiency, under the working method that research can be set the user (comprising individual event, phase three-wire three and three-phase and four-line), the every parameter of electrical network is detected, realize the measurement of power quality indexes and the electric system comprehensive measurement device that result shows simultaneously, carry out power network monitoring and electric energy and administer the new focus that becomes power industry research in recent years.

The development experience of power param eter supervision device three phases: the first generation refers to pointer instrument, and the second generation is digital measuring apparatus, and the third generation is intelligent instrument.

Domestic extensive employing statistical voltage table monitoring voltage quality level, these voltage monitoring instruments can only the monitoring voltage qualification rate, need manual metering, lack function of statistic analysis, and harmonic wave and voltage fluctuation, Portable Measurement Instrument is used in the measurement of flickering, respectively to the busbar voltages at different levels of transformer station, the harmonic current of each side of main-transformer, the harmonic current of capacitor group is measured, big-and-middle-sized nonlinear-load user and power plant and low-voltage network electric current are measured, then according to measurement data, gathered, statistical study, quality of power supply level to electrical network is assessed.

In realizing process of the present invention, the inventor finds that at least there is following problem in prior art:

Above-mentioned electric energy quality monitoring means and management mode exist the obvious limitation such as real-time is poor, measurement index is few, workload is large, measuring error is large, efficiency is low.

Summary of the invention

In order to solve the problem of prior art, the embodiment of the present invention provides a kind of Power Quality Detection system and method for operating thereof.Described technical scheme is as follows:

On the one hand, the invention provides a kind of Power Quality Detection system,

Data acquisition module, data processing module, MCU human-machine interface module, power module that described Power Quality Detection system is connected by signal form.

Preferably, described data acquisition module comprises that six tunnels analogies of ADI company input 16 bit serial programmable A/D converter AD73360.

Preferably, described data processing module comprises 16 fixed DSP processor TMS320VC5402 of TI company.

Preferably, the MSP430F149 single-chip microcomputer that the single-chip microcomputer in described MCU human-machine interface module is TI company.

On the other hand, the present invention also provides a kind of Power Quality Detection system operation methods,

Described Power Quality Detection system operation methods comprises:

Start;

System power-on reset dsp operation load module;

System initialization: control initialization, GPIO initialization, EV initialization, McBSP initialization etc.;

Open interruption;

AD73360 carries out data acquisition;

Data are processed and the FFT frequency analysis;

Corresponding and the data of button show and upper machine communication.

The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:

Native system has very high measuring speed and measuring accuracy, man-machine interface close friend, easy operating, function

Complete, there is extensibility, be convenient to the hardware and software upgrading of system, there is good practical value.

The accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the structured flowchart of the Power Quality Detection system that provides of the embodiment of the present invention one;

Fig. 2 is the method flow diagram of the Power Quality Detection system operation methods that provides of the embodiment of the present invention two.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.

Embodiment mono-

The embodiment of the present invention one provides a kind of Power Quality Detection system, and referring to Fig. 1, data acquisition module, data processing module, MCU human-machine interface module, power module that described Power Quality Detection system is connected by signal form.

Particularly, data acquisition module comprises that six tunnels analogies of ADI company input 16 bit serial programmable A/D converter AD73360.This chip has 6 analog input channels, is particularly suitable for three-phase system operation power parameter investigating.These 6 passages can be sampled simultaneously, and need not CPU interfere, and the digital quantity that the exportable length of each passage is 16 calculates knownly, and the resolution of 16 A/D can reach 0.00153% in theory, meets the system accuracy requirement fully.AD73360 adopts the difference input of AC coupling, by the McBSP interface, with TMS320VC5402, is connected, and the number of interface signal line only has 6, simple and direct efficient.

Particularly, data processing module comprises 16 fixed DSP processor TMS320VC5402 of TI company.

In the sheet of TMS320VC5402, storage space is divided into three selectable parts, is respectively the program space, data space and the input/output space of 64K word.TMS320VC5402 has the ROM of DARAM and 4K word in the 16K word slice, can extend out ROM, 64K word RAM, the 64KI/O of maximum 1M * 16.In all of TMS320VC5402 and in the outer program storage of sheet and sheet and the unified index respectively of the outer data-carrier store of sheet, therefore, 3 positions control information MP/MC, OVLY by working method register PMST,

DROM, can be defined as ram in slice program or data-carrier store easily.

MCU selects a High Performance SCM MSP430F149 to be responsible for the processing again of data and demonstration, Keyboard Control, switching value input and output etc., with DSP, forms a master-slave system.

The HPI-8 Interface realization that utilizes C5402 to carry is communicated by letter with single-chip microcomputer, and both sides complete communication by the on-chip memory of sharing C5402, and single-chip microcomputer is main control part, adopts the port mode directly to access the HPI mouth.

Particularly, the MSP430F149 that single-chip microcomputer in the MCU human-machine interface module is TI company, MSP430F149 adopts " von Neumann " structure, and RAM, ROM and whole peripheral module all are positioned at same address space, the FLASH ROM that the maximum address address is 62KB(60K, the RAM of 2K).Inner 1 hardware multiplier, 1 accurate analog comparator, 2 of also being integrated with has WatchDog Timer, 2 serial communication interfaces and 48 I/O pins in the timer, 12,8 tunnel A/D converter, sheet of catch/comparand register, a plurality of registers such as the corresponding input respectively of each I/O mouth, output, function selection, interruption, make function mouth and general purpose I/O mouth reusable, greatly strengthen port function and dirigibility, improved the development ability to peripherals.

Simultaneously, MSP430F149 is FLASH memory type single-chip microcomputer, has good simulating developer technology, is provided with JTAG emulation interface and Advanced Compiler Tools.Under systems support software, hardware debug and the software development of canbe used on line to goal systems, comprise compilation, C language, connection and dynamic debugging, has single step, multibreak and tracking, and open whole storeies, register, can carry out hardware, software development to system easily and reliably.

Particularly, liquid crystal display circuit is the OCM12864-3 of Electronics Co., Ltd. of Jinpeng type LCDs.OCM12864-3 is the liquid crystal display of a kind of 128*64 dot matrix (EL is backlight), it forms the main hardware circuit by column drive circuit KS0108 and a slice horizontal drive circuit KS0107 of two tape controllers, KS0108 will control display screen and be divided into the left and right half screen, by CS1, CS2, select.

It is core that the Power Quality Detection system be take the TMS320VC5402 chip of TI company, the man-machine interface circuit and the system supplymentary power supply that comprise current/voltage buffer circuit, signal condition and A/D sample circuit, 16 the low-power scm MSP430F149 of take are core, realized each electric parameter to comprising three-phase current voltage measurement, show to control and the functions such as communication.The factors such as whole system, accurately to sample and to be treated to basis, is taken into account whole simplicity of design, with low cost.

At first three-phase voltage/electric current filtering higher hamonic wave after the conversion of accurate voltage current transformer, then process signal conditioning circuit is transformed to the signal that is applicable to the AD73360 sampling and is sampled.AD73360 sends digital signal into DSP after sampling is completed.After by DSP, sampled data further being done to anti-aliasing processing, calculate each parameters of electric power and carry out frequency analysis by fast Fourier algorithm, and will respectively need parameter to be stored.Each real-time electric parameter after DSP processes is given and be take the host computer that MSP430F149 is core and shown through communication unit.System has keyboard input control circuit and LCD liquid crystal display circuit, realizes friendly, man-machine interface intuitively.

To sum up, the final goal of parameters of electric power real-time measurement system is to take high speed processor DSP as core, realizes real-time, the Measurement accuracy of three-phase power basic parameter and power quality parameter by the FFT digital signal processing algorithm, and the concrete function of native system is as follows:

(1) realize the synchronous acquisition to three-phase six road power network signals, by digital signal processing algorithm, realize the real-time measurement to the electric power basic parameter, comprising: three-phase voltage, current effective value, active power, reactive power, applied power, power factor etc.; The real-time measurement of the six tested power network signal power quality parameters in road comprises: voltage deviation, frequency departure etc.;

(2) frequency analysis, calculate harmonic voltage current amplitude, frequency, phase place etc. by algorithm;

(3) select each road power network signal, measured parameter etc. by keyboard, measurement result is shown.

Embodiment bis-

The embodiment of the present invention two provides a kind of Power Quality Detection system operation methods, and referring to Fig. 2, described Power Quality Detection system operation methods comprises:

At first the DSP program design will complete the BOOTLOADER boot of DSP and start the initialization of system.Native system MP/MC pin ground connection, while powering on RESET, DSP selects the microcomputer mode, and the program FF80H address of ROM internally brings into operation, and an instruction that jumps to the BOOT program is arranged, the good BOOT program of execution inside solidification at FF80H place.

Software first will complete the initialization to each hardware of system, and initialized major function is to read in the system journey

The order setup code, arrange initial value by the required various data of operation, by initialization function init_PQMonitor ()

Complete; The initialization object comprises TMS320VC5402, AD73360, asynchronous communication module, clock etc.

In order to make serial ports can coordinate AD73360 to start working, need to the McBSP serial ports of DSP be arranged, comprising word length, permission are produced to arranging of interruption etc.The clock of rear serial ports of starting working is produced by AD73360, then by the serial ports set, A/D is carried out to initialization, opens six road sampling channels, and sampling pattern etc. is set.Then opening INT0 interrupts.INT0 is produced by the PLL circuit, realizes thus synchronized sampling.DSP, after receiving INT0, opens and send to interrupt sending the sampling instruction to A/D, and opens data receiver simultaneously and interrupt starting to receive data, after sampling, data are carried out to fft analysis and process after data show and transmission.

The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:

Native system has very high measuring speed and measuring accuracy, man-machine interface close friend, and easy operating, multiple functional, there is extensibility, be convenient to the hardware and software upgrading of system, there is good practical value.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (5)

1. a Power Quality Detection system, is characterized in that,

Data acquisition module, data processing module, MCU human-machine interface module, power module that described Power Quality Detection system is connected by signal form.

2. Power Quality Detection system according to claim 1, is characterized in that,

Described data acquisition module comprises that six tunnels analogies of ADI company input 16 bit serial programmable A/D converter AD73360.

3. Power Quality Detection system according to claim 1, is characterized in that,

Described data processing module comprises 16 fixed DSP processor TMS320VC5402 of TI company.

4. Power Quality Detection system according to claim 1, is characterized in that,

The MSP430F149 single-chip microcomputer that single-chip microcomputer in described MCU human-machine interface module is TI company.

5. a Power Quality Detection system operation methods as claimed in claim 1, is characterized in that,

Described Power Quality Detection system operation methods comprises:

Start;

System power-on reset dsp operation load module;

System initialization: control initialization, GPIO initialization, EV initialization, McBSP initialization etc.;

Open interruption;

AD73360 carries out data acquisition;

Data are processed and the FFT frequency analysis;

Corresponding and the data of button show and upper machine communication.

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