CN201527448U - An Embedded Power Quality Monitoring System - Google Patents

Abstract

The utility model discloses an embedded power quality monitoring system, aiming to provide an embedded power quality monitoring system with high control means, sensitive and quick real-time response, and strong adaptability to harsh environments. The utility model comprises an analog signal AC sampling part (1), a high-speed analog signal processor (2), a man-machine interface processor (3), a system interface (4), a sampling unit (11), and an analog signal conditioning circuit (12) , A/D signal conversion circuit (13), DI/DO circuit (21), DSP processor (22), SDRAM memory (23), debugging interface (31), ARM chip (32), extended RAM (33), LCD interface (41), SD card interface (42), Ethernet interface (43), USB interface (44), corresponding adaptation connection between the above-mentioned circuits, this embedded design has been very good in the field of data processing and detection control It can be widely used in the field of power system monitoring.

Description

An Embedded Power Quality Monitoring System

technical field

The utility model relates to an embedded power quality monitoring system.

Background technique

As a special monitoring device for modern grid power supply and power consumption parameters, the power quality monitoring device not only has the rapidity requirements for real-time data sampling, processing and analysis, but also puts forward higher requirements for the transmission, display, storage and communication of system data. In this case, the system handles a wide variety of tasks, including periodic tasks such as data sampling and various calculations, as well as random events such as communication and human-computer interaction. This requires real-time signal processing Continuous improving. Power supply is an important pillar for the survival of modern society. The ideal public grid should supply power to users with constant frequency, standard voltage and sinusoidal waveform. However, the non-linear or asymmetrical equipment such as generators, transformers and lines in the power system, the randomness and changeability of the load nature, coupled with imperfect control methods, operation operations, external interference and various faults, etc., have caused power grid operation, Various problems in power equipment and power supply links. More and more urgent requirements have a high-performance design scheme to adapt to it. Combining ARM technology and DSP technology in embedded systems will give full play to the advantages of both to meet the real-time and high-efficiency communication requirements of data in intelligent control systems. Therefore, in hardware design, the use of ARM+DSP architecture can meet the real-time response of the system and has strict timing. Its working environment may be very harsh, such as high temperature, low temperature, humidity, etc., so the system also requires very high stability and adaptability.

To sum up, the power quality monitoring system in the prior art still cannot meet the needs of current technological progress, and there are still defects such as low control means, insensitive and rapid real-time response, and insufficient adaptability to harsh environments.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, and provide an embedded power quality monitoring system with high control means, sensitive and rapid real-time response, and strong adaptability to harsh environments.

The technical solution adopted in the utility model is: the utility model includes an analog signal AC sampling part, a high-speed analog signal processor, a man-machine interface processor, and a system interface, and the analog signal AC sampling part includes a sampling unit, an analog signal conditioning circuit, a /D signal conversion circuit, the signal collected by the sampling unit is input to the A/D signal conversion circuit after being processed by the analog signal conditioning circuit, and the high-speed analog signal processor includes DI/DO circuit, DSP processor, SDRAM memory , the DSP processor is electrically connected to the DI/DO circuit and the SDRAM memory, the man-machine interface processor includes a debug interface, an ARM chip, and extended RAM, and the ARM chip is electrically connected to the debug interface and the extended RAM , the system interface includes an LCD interface, an SD card interface, an Ethernet interface, and a USB interface, the A/D signal conversion circuit is connected to the DSP processor, the DSP processor is connected to the ARM chip, and the ARM The chip is correspondingly adapted and connected to the LCD interface, SD card interface, Ethernet interface, and USB interface.

The sampling unit device collects various power supply parameters in real time at the required monitoring points of the power supply network.

The beneficial effects of the utility model are: the utility model adopts the design of the above embedded power quality monitoring device, provides a good solution for the embedded instrumentation to realize multiple tasks, convenient and effective access to Ethernet, and realizes remote control and real-time data transmission. Due to the use of parallel multi-task technology to deal with the complex external events of the embedded system and the complexity of the control software system, the real-time performance of the system is guaranteed. The hardware and software configuration of the embedded system is simplified, and the anti-interference ability meets the environmental requirements; the assembly structure is convenient for maintenance. The realization of this embedded intelligent instrument system has made the embedded design well applied in the fields of data processing and detection control, so it is an embedded instrument with high control means, sensitive and rapid real-time response, and strong adaptability to harsh environments. Power quality monitoring system.

Description of drawings

Fig. 1 is a block diagram of the circuit structure of the utility model.

Detailed ways

As shown in Figure 1, the utility model includes an analog signal AC sampling part 1, a high-speed analog signal processor 2, a man-machine interface processor 3, a system interface 4, and the analog signal AC sampling part 1 includes a sampling unit 11, an analog signal conditioning circuit 12. A/D signal conversion circuit 13, the signal collected by the sampling unit 11 is processed by the analog signal conditioning circuit 12 and then input to the A/D signal conversion circuit 13, and the high-speed analog signal processor 2 includes DI/DO Circuit 21, DSP processor 22, SDRAM memory 23, described DSP processor 22 is electrically connected with described DI/DO circuit 21, SDRAM memory 23, described man-machine interface processor 3 comprises debugging interface 31, ARM chip 32, Extended RAM 33, described ARM chip 32 is electrically connected with described debugging interface 31, extended RAM 33, described system interface 4 comprises LCD interface 41, SD card interface 42, Ethernet interface 43, USB interface 44, described A/ D signal conversion circuit 13 is connected with described DSP processor 22, and described DSP processor 22 is connected with described ARM chip 32, and described ARM chip 32 is connected with described LCD interface 41, SD card interface 42, Ethernet interface 43, USB Interface 44 corresponds to an adapter connection.

The sampling unit 11 is installed at the required monitoring point of the power supply network to collect various power supply parameters in real time.

The components and design principles used in this embodiment are as follows:

1. Analog signal AC sampling part (ADS8364);

2. High-speed analog signal processor (DSP F2812+SDRAM);

3. Human-machine interface processor (ARM 2214);

4. System interface (LCD+SD+Ethernet+USB);

Interface design of ARM and DSP:

The system adopts the master-slave parallel processing system of ARM+DSP, and concentrates the functions of human-computer interaction and data communication in the subsystem of ARM, and the host completes the control of all peripherals. The DSP chip mainly completes the capture, sampling, and conversion of input signals, implements various signal processing algorithms, and then transmits the processed digital signals to ARM. Then the ARM transmits the data to the network through the Ethernet controller, realizing remote control and monitoring.

Interface design of ARM and LCD:

2214 is a 16/32-bit RISC processor launched by Samsung. The main frequency of the CPU is 206MHz. The standard configuration is a Sharp 256K color 240x320/3.5-inch TFT LCD screen with a touch screen. It supports Linux, WINCE and EPOC32. Provide the smart card driver module conforming to ISO7816 and EMV2000 under the Linux kernel and the contactless smart card driver module conforming to ISO14443A/B and Mifare series. Its small size, low power consumption, and high performance provide convenience for the design of grid power quality monitoring devices. In this paper, the ARM system mainly realizes the scheduling and control of the basic control unit, and performs functions such as statistics, storage, communication and man-machine dialogue of data.

Communication design between ARM and Ethernet controller:

The Ethernet communication function is realized by a piece of RTL8019AS, which has no special requirements for the embedded processor and has strong versatility. In this design, the default configuration of RTL8019AS and some pins are used as the initialization method of the network card, which can save configuration memory and reduce the size of the embedded hardware platform.

Interface design between DSP and data sampling:

ADS8364 is a high-speed, low-power, six-channel simultaneous sampling and conversion 16-bit analog-to-digital converter, using +5V operating voltage. Fully differential input channels with 80dB common-mode rejection. Also includes six 4μs continuous approximation analog-to-digital converters, six differential sampling amplifiers, internal +2.5V reference voltage with REFIN and REFOUT pins, and a high-speed parallel interface. Six analog inputs are divided into three groups (A, B and C), each input has an ADCs and hold signal to ensure that several channels can be sampled and converted simultaneously. The differential input range is variable from -VREF to +VREF. The use of ADS8364 is mainly to sample the three-phase voltage and current of the power grid, and send the sampled data to DSP for real-time analysis and processing. The sampling frequency of ADS8364 is 6.4KHz, and the sampling frequency is 256 points per cycle.

The utility model can be widely used in the field of power quality monitoring.

Claims (1)

1. An embedded power quality monitoring system is characterized in that: it comprises analog signal AC sampling part (1), high-speed analog signal processor (2), man-machine interface processor (3), system interface (4), The analog signal AC sampling part (1) includes a sampling unit (11), an analog signal conditioning circuit (12), and an A/D signal conversion circuit (13), and the signal collected by the sampling unit (11) is passed through the analog Signal conditioning circuit (12) inputs A/D signal conversion circuit (13) after processing, and described high-speed analog signal processor (2) comprises DI/DO circuit (21), DSP processor (22), SDRAM memory (23) , the DSP processor (22) is electrically connected with the DI/DO circuit (21), the SDRAM memory (23), and the man-machine interface processor (3) includes a debugging interface (31), an ARM chip ( 32), extended RAM (33), described ARM chip (32) is electrically connected with described debugging interface (31), described extended RAM (33), and described system interface (4) comprises LCD interface (41), SD Card interface (42), ethernet interface (43), USB interface (44), described A/D signal conversion circuit (13) is connected described DSP processor (22), described DSP processor (22) and described DSP processor (22) Described ARM chip (32) is connected, and described ARM chip (32) and described LCD interface (41), SD card interface (42), Ethernet interface (43), USB interface (44) are correspondingly adapted to connect.

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