CN203909191U - Electric energy quality analyzing system based on ARM and FPGA - Google Patents

Abstract

The utility model discloses an electric energy quality analyzing system based on an ARM and an FPGA, which belongs to the electric energy quality detection technical field. The system comprises a voltage transformer, a current transformer, a signal conditioning and filtering module and an A/D conversion module. The voltage transformer and the current transformer are connected with an electrical network. The output ends of the voltage transformer and the current transformer are connected with the signal conditioning and filtering module. The output end of the signal conditioning and filtering module is connected with the A/D conversion module. The system further comprises an FPGA module, an ARM module, a display module, a storage module, a communication module and a keyboard module. The input end of the FPGA module is connected with the A/D conversion module. The I/O end of the FPGA module is connected with the ARM module. The display module, the storage module, the communication module and the keyboard module are all connected with the ARM module. The system can rapidly detect and analyze electric energy qualities with high precision and high reliability.

Description

A kind of Analysis System for Power Quality based on ARM and FPGA

Technical field

The utility model relates to power quality detection technique field, more particularly, relates to a kind of Analysis System for Power Quality based on ARM and FPGA.

Background technology

In recent years along with the widespread use of Power Electronic Technique, especially nonlinear-load, the impact load such as the application of HVDC (High Voltage Direct Current) transmission system and a large amount of frequency converters, rectifier, electric arc furnaces constantly introduced electric system, a large amount of harmonic current injection electrical networks, cause Harmonic in Power System content sharply to rise and voltage waveform serious " distortion ", cause the quality of power supply to decline.Reduce electric network reliability, increased grid loss, reduced efficiency and the utilization factor of electrical equipment, in producing and living, all caused huge economic loss.The overall benefit of the fine or not direct relation national economy of the quality of power supply, therefore thereby mains by harmonics is monitored to improve and improve the quality of power supply with analysis to have important practical significance.

Along with electric system is to power quality problem monitoring and the real-time of analyzing, improve constantly the requirement of data volume and calculating, because the software and hardware limited resource of single-chip microcomputer is more, frequency of operation is lower, therefore be difficult to meet the requirement of power quality analyzer, cause the utilization of the high-acruracy survey of electric system, monitoring in real time and advanced algorithm to be restricted, and the product having is without communication and control output function, can not meet the developing direction of power system network, robotization.

FFT (fast fourier transform) algorithm is the highly effective algorithm of a kind of DFT (discrete Fourier transform (DFT)), apply in power quality analysis, by certain phase voltage collecting and current signal application fft algorithm, just can obtain the frequency spectrum of signal, then do the information that further processing can obtain this phase voltage effective value, current effective value, active power, reactive power and applied power and each harmonic.Fft algorithm is applied to power quality analysis can significantly be accelerated data operation process and reduce operand.And widely used power quality analyzer is many based on DSP kernel in the market, dsp chip is a kind of CPU that adopts Harvard structure design, the mode confinement that it is sequentially carried out carry out the speed of FFT computing.

Through retrieval, open about Power Quality Detection prior art scheme.As Chinese Patent Application No. 200820084142.0, the applying date is on March 21st, 2008, invention and created name is: Portable electric power quality monitoring instrument, this application case comprises sensing conditioning and A/D modular converter, FPGA module, dsp system and ARM embedded system, the output terminal of described sensing conditioning and A/D modular converter and FPGA module is all connected to the input end of dsp system by dual port RAM, the output terminal of dsp system is connected with ARM embedded system.This application case adopts the system architecture of FPGA+DSP+ARM, adopt the pure hardware of FPGA to realize the multi-channel high-speed data collection that power quality monitoring needs, and utilized the advantage of DSP on high-speed figure is calculated, the method that adopts FFT, continuous wavelet transform and auto adapted filtering to combine, the high accuracy analysis of realizing Steady state and transient state power quality parameter calculates.

China Patent No. ZL201220405616.3 and for example, Granted publication day is on March 13rd, 2013, invention and created name is: a kind of wind-powered electricity generation quality detection device based on FPGA processor and arm processor, this application case comprises that voltage transformer (VT) summation current transformer is connected with frequency overlapped-resistable filter, frequency overlapped-resistable filter is connected with A/D converter with phase locking frequency multiplying module, A/D converter is connected with FPGA processor, FPGA processor and FLASH1, SDRAM1 is connected with arm processor, arm processor and GPRS module, Ethernet interface, reseting module, display module, FLASH2, SDRAM2, SD storage card is connected with Keysheet module.This application case is the quality of power supply situation of each point of detection of grid in real time, and send the data that collect to host computer by GPRS wireless network, as electrical network breaks down, so that staff according to the data of uploading, electric network fault point is determined and fault is got rid of.Though above-mentioned application case all can complete detection and the analysis of the quality of power supply, the complex structural designs of above-mentioned application case, manufacturing cost is high, still needs further improvement.

Summary of the invention

1. the technical matters that utility model will solve

The purpose of this utility model is to overcome that existing power quality analysis device exists: 1) to the monitoring of power quality problem, to analyze real-time poor, measuring accuracy is not high; 2) the limited deficiency of the utilization of advanced algorithm, a kind of Analysis System for Power Quality based on ARM and FPGA is provided, the utility model has built one and take the system that ARM and FPGA be core, FPGA can realize hardware based concurrent operation, aspect computing velocity, than DSP, have more advantage, and flexible configuration, the parallel running of internal processes energy, can meet the requirement of fft algorithm preferably; And ARM is having larger advantage with respect to other device aspect control, transaction management and communication capacity, the technical scheme that the utility model provides is applied in power quality analysis, monitoring real-time and precision to the electrical network quality of power supply to be measured are high, are convenient to suit the remedy to the case improve the quality of power supply.

2. technical scheme

For achieving the above object, the technical scheme that the utility model provides is:

A kind of Analysis System for Power Quality based on ARM and FPGA of the present utility model, comprise voltage transformer (VT), current transformer, signal condition and filtration module, A/D modular converter, described voltage transformer (VT) summation current transformer is connected with electrical network, the output terminal of this voltage transformer (VT) summation current transformer is connected with filtration module with signal condition, and described signal condition is connected with A/D modular converter with the output terminal of filtration module; Voltage transformer (VT) summation current transformer converts the voltage and current of electrical network to light current simulating signal and flows to A/D modular converter by signal condition and filtration module, and A/D modular converter is converted to digital signal by the simulating signal of reception; Also comprise FPGA module, ARM module, display module, memory module, communication module and Keysheet module; Described FPGA module adopts the fpga chip that model is EP3C16F484C6, and the input end of this FPGA module is connected with A/D modular converter, and the I/O end of FPGA module is connected with ARM module; Described ARM module adopts the ARM microcontroller that model is STM32F103, and described display module, memory module, communication module and Keysheet module are all connected with ARM module, and described memory module adopts dual port static memory.

Further, Analysis System for Power Quality also comprises power module, and this power module adopts the power supply of 24V Switching Power Supply.

Further, described power module comprises two-stage decompression voltage regulator, and previous stage circuit is 5V voltage by 24V voltage transition, and rear one-level circuit is 3.3V voltage by 5V voltage transition; Described display module and memory module adopt 5V power supply, and described FPGA module and ARM module adopt 3.3V power supply.

Further, described display module adopts the colour dot lattice LCD MODULE that model is MzTH43V10.

3. beneficial effect

The technical scheme that adopts the utility model to provide, compares with existing known technology, has following beneficial effect:

(1) a kind of Analysis System for Power Quality based on ARM and FPGA of the present utility model, its FPGA module adopts the fpga chip that model is EP3C16F484C6, can realize hardware based concurrent operation, the real-time grid data that gather are analyzed fast and processed, aspect computing velocity, than DSP, have more advantage, flexible configuration, the parallel running of internal processes energy, can meet the requirement of fft algorithm preferably;

(2) a kind of Analysis System for Power Quality based on ARM and FPGA of the present utility model, its ARM module adopts the microcontroller that model is STM32F103, STM32F103 microcontroller has the kernel based on 32 ARM Cortex-M3 frameworks, the far super general single-chip microcomputer of computing power; And the extensibility of STM32F103 microcontroller internal storage and be also better than general single-chip microcomputer with the communication performance of miscellaneous equipment, being used in conjunction with of STM32F103 microcontroller and EP3C16F484C6 chip guaranteed to the detection of the quality of power supply in real time, quick and precisely.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of a kind of Analysis System for Power Quality based on ARM and FPGA of the present utility model;

Fig. 2 is the outside connection diagram of STM32F103 microcontroller in the utility model;

Fig. 3 is 5V decompression voltage regulator in the utility model;

Fig. 4 is 3.3V decompression voltage regulator in the utility model.

Embodiment

For further understanding content of the present utility model, in conjunction with the accompanying drawings and embodiments the utility model is described in detail.

Embodiment 1

By reference to the accompanying drawings, a kind of Analysis System for Power Quality (referring to Fig. 1) based on ARM and FPGA of the present embodiment, comprise voltage transformer (VT), current transformer, signal condition and filtration module, A/D modular converter, described voltage transformer (VT) summation current transformer is connected with electrical network, the output terminal of this voltage transformer (VT) summation current transformer is connected with filtration module with signal condition, and described signal condition is connected with A/D modular converter with the output terminal of filtration module; Voltage transformer (VT) summation current transformer converts the voltage and current of electrical network to light current simulating signal and flows to A/D modular converter by signal condition and filtration module, and A/D modular converter is converted to digital signal by the simulating signal of reception.

The system of the present embodiment also comprises FPGA module, ARM module, display module, memory module, communication module, Keysheet module and power module.The input end of FPGA module is connected with A/D modular converter, and for receiving the digital signal of A/D modular converter input, the I/O end of FPGA module is connected with ARM module.Field programmable gate array (Field Programmable Gate Array, FPGA) has obtained the development of advancing by leaps and bounds in recent years, become at present and realized one of system digitalized Mainstream Platform.Compare with DSP, FPGA advantage is to carry out parallel computation.When to carry out this class concurrent operation of FFT be main algorithm, adopt the benefit of FPGA self-evident.In order to shorten the construction cycle, reduce design risk and fund input, the fpga chip that the model that the FPGA module of the present embodiment adopts altera corp to produce is EP3C16F484C6, altera corp has released IP module library based on this fpga chip, calculating parameter, the structure of the plurality of optional of fft algorithm, the sequential system of data iostream are provided, to realize easily and flexibly fft algorithm.

The ARM module of the present embodiment adopts the microcontroller that model is STM32F103, STM32F103 microcontroller has the kernel based on 32 ARM Cortex-M3 frameworks, high energy work is to 72MHz and contain monocycle multiplication and hardware division, the far super general single-chip microcomputer of computing power.In STM32F103 microcontroller, there are in addition 512K flash memory program storage and 64KSRAM and with static memory controller and a plurality of communication interface, as I2C, UART, SPI, CAN, USB etc., storer extensibility and be also better than general single-chip microcomputer with the communication performance of miscellaneous equipment, STM32F103 microcontroller is also with 3 12 bit A/D converters simultaneously, in computing power and memory capacity, all there is good performance, cost performance is high, and control ability is strong, and extensibility is good.

STM32F103 microcontroller is the control core of whole system, and described display module, memory module, communication module and Keysheet module are all connected with STM32F103 microcontroller.STM32F103 microcontroller mainly completes following task (referring to Fig. 3):

(1) utilize 12,3 tunnel ADC to nursing one's health filtered three-phase voltage, current signal carries out analog to digital conversion, because there are 6 analog quantitys to gather by 3 road ADC, so need to be to the signal acquisition time that divides into groups, the present embodiment microcontroller can be controlled 3 road ADC and in 1 μ S, realize once parallel conversion, and acquisition time scheme is saving resource but also can meet system requirements not only;

(2) microcontroller utilizes inner LCD parallel control interface (LCD Parallel IF) to connect and controls LCD display module;

(3) the variable static memory controller (FSMC) in microcontroller connects outside dual port static memory (Dual-Port SRAM), microcontroller is sent sampled data into designated memory space and is read for FPGA module, and reads the data after FFT conversion at assigned address;

(4) control communication module and realize data transmission, communication module comprises other interfaces such as USB and Ethernet;

(5) supervisory keyboard module, realizes the processing of button and other task.

What deserves to be explained is, the memory module of the present embodiment adopts dual port static memory, because FPGA module mainly realizes the hardware based Fast Fourier Transform (FFT) of voltage and current signal (FFT), time-domain signal is transformed in frequency domain, for frequency analysis and the calculating in later stage are prepared.Consider between ARM module and FPGA module and need to cause in the course of work and exist and be out of step because deal with data speed is different compared with large exchanges data and both meetings, the present embodiment connects ARM module and FPGA module by a dual port static memory, exchanges data at a high speed can be guaranteed, certain data buffering can be carried out again.The specific works flow process of FPGA module and dual port static memory is as follows: first, by 16 bit parallel buses, read the voltage being stored in dual port static memory, the time-domain signal of electric current; Then in FPGA inside modules, make hardware based base-4FFT calculation process; Finally the data after processing being sent back to the position of appointment in dual port static memory stores.

The power module of the present embodiment adopts the power supply of 24V Switching Power Supply.Power module comprises two-stage decompression voltage regulator, previous stage circuit (referring to Fig. 3) is 5V voltage by 24V voltage transition, display module and memory module adopt 5V power supply, consider that previous stage circuit pressure reduction is larger, if generate heat excessive with linear voltage stabilization chip as 78L05, so select switching mode voltage stabilizing chip LM2567-5.0, guarantee that power supply is stable, efficient.Rear one-level circuit (referring to Fig. 4) is 3.3V voltage by 5V voltage transition; Described FPGA module and ARM module adopt 3.3V power supply, and voltage stabilizing chip is selected LM1117-3.3.

The display module of the present embodiment adopts 4.3 cun of colour dot lattice LCD MODULE that model is MzTH43V10.Can control by serial SPI interface, save the IO resource of microcontroller.

Table 1 is for being used Analysis System for Power Quality and the Fluke434 of the present embodiment to measure certain 380V of factory distribution mains side harmonic data contrast.High, the stable performance of the systematic survey degree of accuracy of the present embodiment as can be seen from Table 1, reaction velocity are fast, and the indices such as voltage and current effective value, performance number, each harmonic (≤65 times) parameter, tri-phase unbalance factor, flickering all can meet the demands.The system of the present embodiment can be stored in figure or other data in computing machine or USB storage by Ethernet interface or USB interface simultaneously, facilitates follow-up analysis and diagnosis.

Certain factory's distribution mains side harmonic current data contrast of table 1

A kind of Analysis System for Power Quality based on ARM and FPGA described in embodiment 1, the present situation of disturbing increase and the quality of power supply to decline for current electrical network, the STM32F103 based on ARM kernel that adopts company of STMicw Electronics (ST) to produce makes main control chip, being used in conjunction with EP3C16F484C6 chip analyzes fast and processes the real-time grid data that gather again, resulting data are sent to memory stores, simultaneously can require simultaneous display according to user, with reach to the quality of power supply carry out in real time, the object of fast monitored and analyzing and diagnosing; Take full advantage of the advantage of the powerful transaction capabilities of ARM and the concurrent operation of FPGA hardware, have that stable performance, measuring accuracy are high, easy to use, cost performance high, can administer the source that offers precise data for electrical network.

Claims (4)

1. the Analysis System for Power Quality based on ARM and FPGA, comprise voltage transformer (VT), current transformer, signal condition and filtration module, A/D modular converter, described voltage transformer (VT) summation current transformer is connected with electrical network, the output terminal of this voltage transformer (VT) summation current transformer is connected with filtration module with signal condition, and described signal condition is connected with A/D modular converter with the output terminal of filtration module; Voltage transformer (VT) summation current transformer converts the voltage and current of electrical network to light current simulating signal and flows to A/D modular converter by signal condition and filtration module, and A/D modular converter is converted to digital signal by the simulating signal of reception; It is characterized in that: also comprise FPGA module, ARM module, display module, memory module, communication module and Keysheet module; Described FPGA module adopts the fpga chip that model is EP3C16F484C6, and the input end of this FPGA module is connected with A/D modular converter, and the I/O end of FPGA module is connected with ARM module; Described ARM module adopts the ARM microcontroller that model is STM32F103, and described display module, memory module, communication module and Keysheet module are all connected with ARM module, and described memory module adopts dual port static memory.

2. a kind of Analysis System for Power Quality based on ARM and FPGA according to claim 1, is characterized in that: Analysis System for Power Quality also comprises power module, and this power module adopts the power supply of 24V Switching Power Supply.

3. a kind of Analysis System for Power Quality based on ARM and FPGA according to claim 2, it is characterized in that: described power module comprises two-stage decompression voltage regulator, previous stage circuit is 5V voltage by 24V voltage transition, and rear one-level circuit is 3.3V voltage by 5V voltage transition; Described display module and memory module adopt 5V power supply, and described FPGA module and ARM module adopt 3.3V power supply.

4. according to a kind of Analysis System for Power Quality based on ARM and FPGA described in claim 2 or 3, it is characterized in that: described display module adopts the colour dot lattice LCD MODULE that model is MzTH43V10.