CN1188809C - Radio communication type comprehensive power distribution measuring and recording instrument - Google Patents

Abstract

The present invention relates to a comprehensive power quality monitoring and recording device for power distribution systems, namely a radio communication type comprehensive power distribution measuring and recording instrument which comprises a digital-to-analog converter ADC, a CPU1 as a digital signal processor, a system clock, a parameter memory, a program and data memory, an outer logic circuit 1, a communication module interface and a GPRS communication card, wherein the communication module interface is connected with the CPU1; the GPRS communication card comprises a CPU2, a program memory 2, an outer logic circuit 2, a communication interface module, a GPRS module and an SIM card; the CPU2 is connected with the outer logic circuit 2 through an interruption and control line, a data bus and an address bus; the CPU2 is connected with the program memory 2; the CPU2 is connected with the CPU1 through a Communication module via a serial communication interface to exchange data with the CPU1 while the CPU2 is connected with the GPRS module through a serial-to-parallel converting module; the GPRS module is connected with the SIM card; the CPU2 and the GPRS module exchange the data with the SIM card; the GPRS module is connected with an antenna, and thus, a data signal can be transmitted through the antenna.

Description

Wireless telecommunications formula integrated measuring and recording electric distribution instrument

Technical field

The present invention relates to a kind of power distribution system quality of electric power comprehensive monitoring and pen recorder, this device collection data acquisition, data analysis, data storage and data transmission and one are used for the real-time monitoring and the periodic analysis assessment of power distribution system quality of electric power.

Background technology

At present, commonly used equipment for monitoring power quality is made up of electric parameters collection (mutual inductor), data analysis storage (16 single-chip microcomputer or DSP), data presentation, communication interface (RS232 or RS485) in the distribution system.With power quality index roll display on LCD screen of monitoring, can check at the monitoring scene, perhaps regularly hold special meter-copy device and check meter to the scene by the technician, will copy to such an extent that data are taken back monitoring center, carry out data statistic analysis in the input computing machine.But adopt the monitoring device of this technical scheme that following two problems are arranged: 1. the single-chip microcomputer arithmetic speed is slower, is unfavorable for real-time monitoring, especially the harmonic monitoring of electric current and voltage.2. the use serial communication interface needs the technician regularly to check meter to the scene with meter-copy device, and the speed of checking meter is slow.Owing to be regularly to check meter to the scene, possibly can't in time find if go wrong, and can't accomplish to obtain real-time Monitoring Data whenever and wherever possible, be unfavorable for that power supply department in time carries out the enforcement of monitoring to the quality of power supply.If will realize that remote meter reading then needs to lay communication line specially, install communication device additional, expense is big, the cost height.

Summary of the invention

The present invention has overcome existing power distribution system quality of electric power monitoring device will be regularly to the on-the-spot defective of checking meter, can not realize remote real time monitoring, a kind of wireless telecommunications formula integrated measuring and recording electric distribution instrument is provided, this comprehensive instrument for measuring and recording can not only be measured every power quality index of distribution system quickly and accurately, and can carry out communication with wireless mode, data are sent to a distant place, realize that the long distance wireless of power distribution system quality of electric power is monitored in real time.

The present invention is achieved in that a kind of wireless telecommunications formula integrated measuring and recording electric distribution instrument, comprise the AC-to-DC supply module, voltage transformer (VT), current transformer, digital to analog converter, first digital signal processor, system clock and parameter storage, first program storage, data-carrier store, first outer logic circuit, communication module interface that is connected with first digital signal processor and GPRS address card, the GPRS address card comprises second digital signal processor, second program storage, second outer logic circuit, communication interface module, GPRS module and SIM card, second digital signal processor is through interrupting and control line, data bus, address bus connects second outer logic circuit, second digital signal processor is connected second program storage through address bus with data bus, second digital signal processor connects first digital signal processor by communication module through serial communication interface, with the first digital signal processor swap data, second digital signal processor connects the GPRS module by string and modular converter simultaneously, the GPRS module connects SIM card, second digital signal processor and GPRS module and SIM card are carried out exchanges data, the GPRS module connects antenna, and data-signal is gone out through antenna transmission.

The present invention has adopted the wireless communication mode based on GPRS, has removed the trouble of checking meter in the technician scene from, only needs the rational information communication expense of payment, just can monitor in real time in Surveillance center at different levels, and need not to lay special communication line.Select the high-performance cpu chip for use, make that the speed of data collection and analysis is faster, precision is higher, memory data output is bigger, both satisfied the periodic analysis of electric power quality, be applicable to the real-time monitoring and the fault alarm of the quality of power supply again.

Description of drawings

Fig. 1 is a wireless telecommunications formula integrated measuring and recording electric distribution instrument structured flowchart of the present invention, and Fig. 2 is the circuit block diagram of the data acquisition of wireless telecommunications formula integrated measuring and recording electric distribution instrument, processing, storage area, and Fig. 3 is the circuit block diagram of address card.

Among the figure: 1 multi-channel digital and analogue converter (being called for short ADC), 2 digital signal processors (being called for short CPU or DSP), 3 data storage, 4 system clocks, 5GPRS address card, 6 communication modules.AC-DC supply module: AC-to-DC supply module, CPU1: first digital signal processor, CPU2: second digital signal processor, 1: the first program storage of program storage, 2: the second program storages of program storage, 1: the first outer logic circuit of outer logic circuit, 2: the second outer logic circuits of outer logic circuit.

Embodiment

Referring to Fig. 1, Fig. 2, Fig. 3, a kind of wireless telecommunications formula integrated measuring and recording electric distribution instrument comprises signals collecting, data processing, data communication three parts.Signals collecting comprises AC-DC supply module, voltage, current transformer, digital to analog converter ADC; Data processing comprises the first digital signal processor CPU1, system clock and parameter storage, first program storage, data-carrier store, first outer logic circuit; Data communication comprises communication module interface and the GPRS address card that is connected with the first digital signal processor CPU1.

Referring to Fig. 2, power unit adopts the AC-DC supply module of customization, and the sampling power supply need not to connect in addition power supply simultaneously as working power, promptly uses the three-phase alternating current power supply.Monitoring voltage (secondary side, phase voltage) can be from 50V-350V; And when the electric system phase-deficient operation (even arbitrarily two-phase all during short of electricity), integrated measuring and recording electric distribution instrument can both be kept operate as normal.

Voltage, current signal input analog-to-digital conversion module (comprising operational amplification circuit and AD converter) that voltage to be monitored, electric current obtain after detecting through voltage, the mutual salty device of electric current, the ADC chip that the AD modular converter is selected for use is the MAX125 of MAXIM company, this chip sampling precision height, have 14 bit resolutions, sample frequency 76kHz (4 passage); Inner integrated sampling hold circuit; And line output, digital signal is transformed into the 3.3V level that is fit to the first digital signal processor CPU1 chip by level switch module; This chip range is ± 5V, the difference input, and the simulation part only need be added simple range amplifying circuit and be got final product, and antijamming capability is strong, precision is high.

The first digital signal processor CPU1 selects 32 Floating-point DSP-TMS320VC33 of TI company for use.This chip adopts Harvard structure, the operation of 4 level production lines, and instruction execution cycle 17ns, peripheral hardware comprise a dma controller and a buffered serial port.The speed of data acquisition and processing (DAP) is fast like this, precision is high: all the refresh time of monitoring variable is less than 0.5s, and precision is 0.5%; Use DS1553 that system data, time are provided, punctual timing, time error is less than 1s/ week, and systematic parameter is stored among the DS1553, and this chip has lithium battery power supply during power failure, and data can be preserved and do not lost in 10 years; The first digital signal processor CPU1 connects first outer logic circuit, and first outer logic circuit adopts CPLD-XC9572XL, realizes functions such as module interface, sequential control.After sampled result is delivered to the first digital signal processor CPU1 calculation process (DFT conversion, correlation analysis are calculated), with special flash memory stores data; Also as program storage, after system powered on, program 1 (UI computing stored programme) is loaded among the first digital signal processor CPU1 automatically to be moved the flash storer.

Have two kinds of communication modes concurrently.1) RS232 communication: the interface of local communication is provided, can be as data read and the parameter setting of equipment just adorn the time, data read port in the time of also can be as regular equipment inspection.2) GPRS wireless telecommunications: the GPRS communication module wireless transmission data that operative installations itself carries by existing public communication networks transmission data, need not to apply for special line or lay cable.Its communication speed height, the highest up baud rate can reach 42.8kbps.This communication modes not only can be set as the remote parameter of equipment, periodic data reads, and can also be used to carrying out the monitoring of long distance wireless real time data.

GPRS (General Packet Radio Service) GPRS, a kind of packet data bearers system that is that development is come out on existing gsm system.Be applicable to interruption, paroxysmal or frequent, a spot of data transmission, also be applicable to big data quantity transmission once in a while.

Referring to Fig. 3, the GPRS address card comprises the second digital signal processor CPU2, second program storage, second outer logic circuit, communication interface module (communication module and string and modular converter), GPRS module and SIM card, the second digital signal processor CPU2 connects second outer logic circuit through interruption and control line, data bus, address bus, second outer logic circuit is identical with first outer logic circuit, adopt CPLD-XC9572XL, realize functions such as module interface, sequential control; The second digital signal processor CPU2 is connected second program storage through address bus with data bus, second program storage only is used for stored programme, after system powers on, program 2 (GPRS communication program) is loaded among the second digital signal processor CPU2 automatically to be moved, and the second digital signal processor CPU2 finishes data communication, data are temporary, GPRS network is landed, communication connects tasks such as foundation, communications protocol realization; The second digital signal processor CPU2 connects the first digital signal processor CPU1 by communication module through serial communication interface, with the first digital signal processor CPU1 swap data; The second digital signal processor CPU2 connects the GPRS module by string and modular converter simultaneously, the GPRS module connects SIM card, the second digital signal processor CPU2 and GPRS module and SIM card are carried out exchanges data, and the GPRS module connects antenna, and data-signal is gone out through antenna transmission.The second digital signal processor CPU2 is identical with the first digital signal processor CPU1, selects 32 Floating-point DSP-TMS320VC33 of TI company for use.The GPRS module adopts CMS91-80.Embodiments of the invention are selected the technical grade chip for use, and working temperature is from-20 ℃--and 80 ℃, adopt fire prevention, anti-EMI enclosure, adapt to the working environment of electrical power distribution system fully.

Claims (1)

1. wireless telecommunications formula integrated measuring and recording electric distribution instrument, comprise the AC-to-DC supply module, voltage transformer (VT), current transformer, digital to analog converter (ADC), first digital signal processor (CPU1), system clock and parameter storage, first program storage, data-carrier store, first outer logic circuit, it is characterized in that this instrument for measuring and recording also comprises communication module interface and the GPRS address card that is connected with first digital signal processor (CPU1), the GPRS address card comprises second digital signal processor (CPU2), second program storage, second outer logic circuit, communication interface module, GPRS module and SIM card, second digital signal processor (CPU2) is through interrupting and control line, data bus, address bus connects second outer logic circuit, second digital signal processor (CPU2) is connected second program storage through address bus with data bus, second digital signal processor (CPU2) connects first digital signal processor (CPU1) by communication module through serial communication interface, with first digital signal processor (CPU1) swap data, second digital signal processor (CPU2) connects the GPRS module by string and modular converter simultaneously, the GPRS module connects SIM card, second digital signal processor (CPU2) carries out exchanges data with GPRS module and SIM card, the GPRS module connects antenna, and data-signal is gone out through antenna transmission.

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