CN201270433Y

CN201270433Y - Multi-path load management terminal apparatus

Info

Publication number: CN201270433Y
Application number: CNU2008201635308U
Authority: CN
Inventors: 张帆; 孙伟; 周爱武
Original assignee: Hangzhou Dayou Technology Development Co Ltd
Current assignee: Hangzhou Dayou Technology Development Co Ltd
Priority date: 2008-09-04
Filing date: 2008-09-04
Publication date: 2009-07-08
Anticipated expiration: 2018-09-04

Abstract

The utility model discloses a multipath load management terminal device, which comprises a central processor, a total load sampling module, a D S P digital signal processing module, a communication module, a storage module, a human-machine interface module and a multipath shunt load gathering module, wherein the storage module and the human-machine interface module are respectively connected with the central processor, and are controlled by the central processor, the multipath load gathering module and the communication module are connected with a serial port of the central processor, the input end of the total load sampling module is connected with a current transformer, and the output end is connected with the D S P digital signal processing module, the D S P digital signal processing module is further connected to the series port of the central processor. The multipath load management terminal device not only can achieve the acquisition to total load electric parameters, but also can respectively collect electric parameters of multipath shunt loads to achieve better control to the main trunks and each branch of loads.

Description

Multichannel load management terminal device

Technical field

The utility model relates to a kind of Distribution Transformer Terminal Unit device that is used for electric power system, be particularly related to a kind of on Distribution Transformer Terminal Unit, adopt demultiplex load acquisition module, can gather demultiplex load parameter amount simultaneously, realize gathering simultaneously the multichannel load management terminal device of demultiplex load.

Background technology

Since the nineties in 20th century, China began to introduce dsm, load management has also obtained greatly developing as an important component part of dsm, from the initial unidirectional two-way control of adopting that controls to, develop into the comparatively perfect Customer Premises Network of multinomial functions such as integrating remote control, remote signalling, remote measurement from simple distant control function, it efficiently provides powerful technical support for promoting dsm modern times of marching toward.Particularly, obtained greatly developing, played better action for rationally arranging load, level and smooth load curve, the collection electricity charge (many places are used as topmost function to this at that time and are used) in the starting stage of the mid-90 in 20th century.By effective load management, can effectively control the low electric power consumption efficient that " peak-valley difference " that peak load, peak load shifting, alleviation enlarge day by day brought, also to the economical operation, the operating cost that reduces the supply of electric power side that improve electric load, solve large-area severe power shortage problem and all have reality and long-range benefit.

At present, aspect distribution automation products such as domestic existing considerable distribution transforming monitoring in real time, harmonic analysis and reactive power compensation, but function is mostly more similar.As the load management terminal function on basis the most, the control of load and data acquisition, to the measurement of voltage, electric current, power, harmonic wave etc. all developed comparative maturity.But, what install in the box-type substation at present all is the Distribution Transformer Terminal Unit device that can only gather 1 road load, load and often need to gather demultiplex in actual use, if gather the demultiplex load simultaneously, need the electric energy meter of Distribution Transformer Terminal Unit and collection multichannel load to be used, instrument is numerous like this, not only increased the input of equipment, and, increased the workload of safeguarding because the box-type substation compact conformation has also strengthened the workload of wiring.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of multichannel load management terminal device that is applicable to electric power is provided, adopt this multichannel load management terminal device can not only realize collection to the total load electric parameter, can also gather the electric parameter of demultiplex load respectively, load trunk and each branch better be controlled with realization.

For this reason, the technical solution adopted in the utility model is as follows:

A kind of multichannel load management terminal device is characterized in that comprising central processing unit, total load sampling module, DSP digital signal processing module, communication module, memory module, human-computer interface module, further comprises demultiplex load acquisition module; Described memory module, human-computer interface module are connected with central processing unit respectively, and are controlled by central processing unit; Described demultiplex load acquisition module, communication module connect the serial line interface of central processing unit; The input of total load sampling module links to each other with current transformer, and output links to each other with the DSP digital signal processing module, and the DSP digital signal processing module is connected to the serial line interface of central processing unit.

Described demultiplex load acquisition module comprises bleeder circuit, anti-aliasing filter circuit, metering module, and the signal of input again through the anti-aliasing filter circuit, is sent to metering module through signaling conversion circuit then.Preferably, described metering module adopts electric energy computation chip.

Described DSP digital signal processing module adopts the mode of I/O mouth analog data bus that the data of total load sampling are handled.

Described total load sampling module comprises AC signal amplifying circuit, anti-aliasing filter circuit, synchronized sampling circuit, the three-phase voltage electric current of input passes through current transformer, again through the AC signal amplifying circuit, carry out anti-aliasing filter then after, be sent to the synchronized sampling circuit.

Further, described total load sampling module also comprises N line current sample circuit, and the N line current of input is by D.C mutual-inductor, again behind AC signal amplifying circuit, anti-aliasing filter circuit, as the importation of ADC passage in the DSP; DSP inside contains the ADC passage that is useful on sampling N line current.

Further, described total load sampling module also comprises frequency measurement circuit, and the three-phase voltage of input is sent to frequency measurement circuit through behind the current transformer and behind the AC signal amplifying circuit, is sent to DSP again and carries out grid frequency measurement; DSP inside contains the CAP passage that is useful on the measurement mains frequency.

Compared with prior art, the beneficial effects of the utility model are:

On a kind of demultiplex load management terminal device, adopt demultiplex load acquisition module, can gather the electrical energy parameter of demultiplex load, realize setting up respectively load configuration type separately, realization is carried out independent analyses and prediction along separate routes to each load, and controls predicated error separately.The data that the total load sampling module is gathered can be carried out the front end Digital Signal Processing through efficient DSP, pass to central processing unit again and carry out back end signal processing and interface display.

Description of drawings

Fig. 1 is a kind of embodiment system block diagram of the utility model;

Fig. 2 is a kind of 6 tunnel schematic diagrames of loading acquisition module embodiment along separate routes;

Fig. 3 is the circuit diagram of a kind of total load sampling module embodiment;

Fig. 4 is the circuit diagram of a kind of DSP digital signal processing module embodiment;

Fig. 5 is total load sampling module, DSP digital signal processing module, the central processing unit connection diagram of a kind of embodiment.

Embodiment

Below, be example with 6 road load management terminal devices, this specific embodiment is described further.

As shown in Figure 1,6 road of present embodiment load management terminal devices comprise with lower member:

Central processing unit

1,6 tunnel load along separate routes acquisition module 2, total load sampling module 3, DSP digital signal processing module 4, communication module 5, power module 6, memory module 7 and human-computer interface module 8.Wherein, memory module 7, human-computer interface module 8 are connected with central processing unit 1 respectively, and be controlled by

central processing unit

1,6 tunnel acquisition modules 2, communication module 5 of loading along separate routes connect the serial line interface of central processing units, total load sampling module 3 is connected to DSP digital signal processing module 4, the DSP digital signal processing module is connected to the serial line interface of central processing unit, and power module 6 provides the working power of whole device.

Described each module roughly connects as follows: three-phase voltage that 6 tunnel each shunt of loading acquisition module 2 are along separate routes imported, electric current are behind bleeder circuit and anti-aliasing filter, send into electric energy chip ATT7022 and gather each electrical energy parameter along separate routes in real time, and carry out data interaction by SPI interface and central processor CPU 1; Described total load sampling module 3 is accepted the electric current and voltage of total load through the signal behind the current transformer, carry out the high precision analogue conversion, and sending transformation result to calculating that described DSP digital signal processing module 4 is finished whole electrical energy parameters, the result is sent to described central processor CPU 1 by UART the most at last; Described communication module 5 is used for scene and telecommunication; Described memory module 7 is carried out the exchange of ephemeral data and the storage of historical data; Human-computer interface module 8 adopts touches button and extensive dot matrix demonstration liquid crystal display screen, is used for data and shows and the parameter setting.

As shown in Figure 2, the module of loading along separate routes of 6 tunnel in the present embodiment adopts 6 electric energy chip ATT7022 to gather each three-phase current and voltage of input along separate routes respectively.Electric energy chip ATT7022 chip integration has become 6 16 ADC, adopts the input of both-end differential signal, and maximum input differential mode voltage is ± 1.5V.Three-phase current IA1～IA6, IB1～IB6, the IC1～IC6 of input are transformed into voltage signal through constantan wire respectively along separate routes for each, after the anti-aliasing filter circuit of forming via resistance capacitance carries out low-pass filtering again, send into 3 electric current ADC passages of each electric energy chip ATT7022.Each three-phase voltage U A, the UB that imports along separate routes, UC after the anti-aliasing filter circuit of forming via resistance capacitance carries out low-pass filtering again, send into 3 voltage ADC passages of each ATT7022 respectively through resistor voltage divider circuit.Each electric energy chip ATT7022 inside obtains various required parameters by the Digital Signal Processing flow process, comprises active power, reactive power, apparent power, gain merit electric weight, the capacity of idle power etc. of frequency, each phase current and voltage effective value, power factor, phase angle and first-harmonic, harmonic wave and all-wave.

Electric energy chip ATT7022 carries out data interaction by SPI interface and central processor CPU 1, adopts efficient optocoupler to isolate between the SPI interface.The Refout pin of electric energy chip ATT7022 provides the direct current biasing of 2.4V for AC signal, and Reset is a reseting controling signal.

As shown in Figure 3, the input of total load sampling module is connected respectively to 6 current transformers.The total load electric current I A of three-phase voltage U A, UB, UC and the input of input, IB, IC are respectively through 6 current transformers, amplify by the AC signal amplifying circuit of forming by single supply operational amplifier LM2904 and precision resistance again, and the anti-aliasing filter circuit of being made up of single supply operational amplifier LM2904 carries out low-pass filtering, sends into synchronized sampling circuit ADS8364.Synchronized sampling circuit ADS8364 has 6 analog input channels, 6 passages can carry out synchronized sampling and conversion simultaneously, data after the sampling are sent to the DSP digital signal processing module by data/address bus, finish the calculating of parameters such as voltage, electric current, power factor, active power, reactive power, electric weight.Wherein also be sent to the frequency measurement circuit of forming by single supply operational amplifier LM2904 simultaneously through U1, U2, U3 behind current transformer and the ac amplifier circuit, with conversion of signals is the square wave CAPin of same frequency, and the CAP grabber of sending into DSP carries out grid frequency measurement.The N line current IN of input is through current transformer, and the sampled input signal IN1 behind ac amplifier circuit and anti-aliasing filter circuit sends into the ADC passage of DSP inside and samples again.

As shown in Figure 4, DSP digital signal processing module 4 is to adopt TI company to have 32 bit DSPs of flash memory

TMS320F2802 in the mode of analog data bus, carries out data interaction with the total load sampling module, and the data after its sampling are carried out the front end Digital Signal Processing.12 ADC transducers of a plurality of passages are contained in this DSP TMS320F2802 inside, 1 passage wherein, and N line current sampled signal IN1 is used for sampling.This DSPTMS320F2802 inside has 32 CAP and catches timer, and grid frequency measurement signal CAPin is as input, to measure mains frequency.According to the mains frequency of real-time measurement, control synchronized sampling circuit exchanges input variable to filtered 6 the tunnel and carries out synchronized sampling.

In the present embodiment, communication module 5 is bridges of transfer of data between Surveillance center and the multichannel load management terminal device.Surveillance center just can carry out telecommunication with the multichannel load management terminal device of the on-the-spot parameters of electric power of monitoring box type transformer by the GPRS communication network.By GPRS network the relevant parameter of on-the-spot transformer can in time be sent in Surveillance center's computer.Simultaneously the querying command or the control command of Surveillance center also can send to communication module by GPRS network, send central processing unit by communication module to by serial line interface again, and corresponding acquisition module etc. is carried out control operation.

In the present embodiment, central processing unit control data communication simultaneously, man-machine interface and handle task such as some related datas.

Claims

1, a kind of multichannel load management terminal device is characterized in that comprising central processing unit, total load sampling module, DSP digital signal processing module, communication module, memory module, human-computer interface module, further comprises demultiplex load acquisition module; Described memory module, human-computer interface module are connected with central processing unit respectively, and are controlled by central processing unit; Described demultiplex load acquisition module, communication module connect the serial line interface of central processing unit; The input of total load sampling module links to each other with current transformer, and output links to each other with the DSP digital signal processing module, and the other end of DSP digital signal processing module links to each other with the serial line interface of central processing unit.

2, multichannel load management terminal device as claimed in claim 1, it is characterized in that: each of described demultiplex load acquisition module comprises signaling conversion circuit, anti-aliasing filter circuit and metering module along separate routes, the signal of input passes through signaling conversion circuit respectively, through the anti-aliasing filter circuit, be sent to metering module then again.

3, multichannel load management terminal device as claimed in claim 2 is characterized in that: described metering module adopts electric energy computation chip.

4, multichannel load management terminal device as claimed in claim 3 is characterized in that: described DSP digital signal processing module adopts the mode of I/O mouth analog data bus that the data of total load sampling are handled.

5, as claim 1 or 2 or 3 or 4 described multichannel load management terminal devices, it is characterized in that: described total load sampling module comprises AC signal amplifying circuit, anti-aliasing filter circuit, synchronized sampling circuit, the three-phase voltage electric current of input passes through current transformer, again through the AC signal amplifying circuit, after carrying out anti-aliasing filter then, be sent to the synchronized sampling circuit.

6, multichannel load management terminal device as claimed in claim 5, it is characterized in that: described total load sampling module also comprises N line current sample circuit, the N line current of input is passed through D.C mutual-inductor, again behind AC signal amplifying circuit, anti-aliasing filter circuit, as the importation of ADC passage in the DSP; DSP inside contains the ADC passage that is useful on sampling N line current.

7, multichannel load management terminal device as claimed in claim 5, it is characterized in that: described total load sampling module also comprises frequency measurement circuit, the three-phase voltage of input is through behind the current transformer and behind the AC signal amplifying circuit, be sent to frequency measurement circuit, be sent to DSP again and carry out grid frequency measurement; DSP inside contains the timer of catching that is useful on the measurement mains frequency.