CN102655422A - Test system for low-voltage power carrier communication equipment - Google Patents
Test system for low-voltage power carrier communication equipment Download PDFInfo
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- CN102655422A CN102655422A CN2011100500901A CN201110050090A CN102655422A CN 102655422 A CN102655422 A CN 102655422A CN 2011100500901 A CN2011100500901 A CN 2011100500901A CN 201110050090 A CN201110050090 A CN 201110050090A CN 102655422 A CN102655422 A CN 102655422A
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Abstract
The invention provides a test system for low-voltage power carrier communication equipment. The system comprises a purification power supply device, a low-voltage power distribution network channel characteristic analog device, a concentrator carrier module interface card device, an electric energy meter carrier module interface card device and a centralized control computer, wherein the purification power supply device is used for providing electric energy and matching impedance, isolating interference noise and isolating a carrier signal between the concentrator carrier module interface card device and the electric energy meter carrier module interface card device for the inside of the system; the low-voltage power distribution network channel characteristic analog device is used for simulating channel characteristics of a low-voltage power distribution network; the concentrator carrier module interface card device is used for providing power and communication connection for the communication equipment connected with the concentrator carrier module interface card device; the electric energy meter carrier module interface card device is used for providing power and communication connection for an electric energy meter connected with the electric energy meter carrier module interface card device; and the centralized control computer is used for being communicated with the concentrator carrier module interface card device to test the communication equipment, communicated with the electric energy meter carrier module interface card device to test the electric energy meter, and controlling the low-voltage power distribution network channel characteristic analog device. According to the test system for the low-voltage power carrier communication equipment, the low-voltage power carrier communication equipment can be comprehensively tested.
Description
Technical field
The present invention relates to electric power system, particularly, relate to a kind of test macro of low voltage electric power carrier communication equipment.
Background technology
Power line carrier communication is the distinctive a kind of communication mode of power department, and this communication mode relatively is applicable to the scheduling of electric power system, the data acquisition at electric energy terminal and the operation of electric power system.Low-voltage powerline carrier communication electrification line is as transmission medium, because power line is firm in structure, therefore that power line is higher as the communication medium dependability.
Because power line mainly is for power consumption equipment transmits electric energy, so its characteristic is difficult to directly satisfy the requirement of carrier communication aspect a lot.Because power line is connected with the electric loading of using of numerous the unknowns, it is very complicated that the electrical characteristic of low-voltage network seems.Than electric power transmission network and medium voltage distribution network, low-voltage network has more changeable topological structure and load variations, and the impedance matching performance is poorer, and noise circumstance is more abominable, and the decay that signal transmits above that is also more violent.These unfavorable factors have proposed challenge to relying on low-voltage network as the voltage power-line carrier communication technology of communication media, have proposed very high requirement also for the power line carrier communication performance of products.
In order to pass judgment on the communication performance of low-voltage carrier communication product; For its reliable application under full-scale condition provides guidance; Present stage presses for a kind of communication performance test macro of low pressure carrier wave equipment; To realize Validity Test and assessment, strengthen quality control, and the key of this test macro is exactly how to carry out the simulation of low-voltage network characteristic to carrier communication equipment to carrier equipment.
Existing low-voltage carrier communication analogue system mainly is made up of computer communication system, programmable attenuator, signal generator, discrete impedance switching device shifter, frequency spectrograph, oscilloscope, isolating transformer, power conditioner, industrial computer and TT&C software; Because this system is based on the analog machine of separate type, so the cost of this system is high, bulky and complicated operation.In addition; Because each quasi-instrument is not special in carrier communication designs, so the functional parameter waste is comparatively serious, combination also can only simply be simulated the partial properties of carrier communication later; The also effective frequency response characteristic of analog channel in the simulation process; Can't the slice-of-life dynamic variation characteristic, very big with the truth difference, effect is unsatisfactory.
In sum, thus that existing low voltage electric power carrier communication analogue technique exist to realize is complicated, cost is high and can't accurately comprehensively simulate the defective that each item essential characteristic of low-voltage powerline carrier communication channel can't full test low voltage electric power carrier communication equipment.
Summary of the invention
The main purpose of the embodiment of the invention is to provide a kind of test macro of low voltage electric power carrier communication equipment, thereby to solve that the realization that low voltage electric power carrier communication analogue technique of the prior art exists is complicated, cost is high and can't accurately comprehensively simulate the defective that each item essential characteristic of low-voltage powerline carrier communication channel can't full test low voltage electric power carrier communication equipment.
To achieve these goals; The embodiment of the invention provides a kind of test macro of low voltage electric power carrier communication equipment; This system comprises: power conditioner device, low-voltage network channel characteristics analogue means, concentrator carrier module interface card device, electric energy meter carrier module interface card device and centralized control computer; Wherein: described power conditioner device, be used to internal system electric energy and matched impedance, isolation interference noise are provided and isolate said concentrator carrier module interface card device and said electric energy meter carrier module interface card device between carrier signal; Described low-voltage network channel characteristics analogue means; Be connected with described power conditioner device, be used for the signal of said power conditioner device output is comprised the simulation of the low-voltage network channel characteristics of noise characteristic, transfer impedance characteristic, loss decay characteristics, multipath transmission interference characteristic and load impedance characteristic; Described concentrator carrier module interface card device; Be connected with low-voltage network channel characteristics analogue means with described power conditioner device, being used to the communication equipment that is connected with said concentrator carrier module interface card device provides electric energy and provides communication to connect; Described electric energy meter carrier module interface card device is connected with low-voltage network channel characteristics analogue means with described power conditioner device, and being used to the electric energy meter that is connected with said electric energy meter carrier module interface card device provides electric energy and provide communication to connect; Described centralized control computer; Be connected with described low-voltage network channel characteristics analogue means, concentrator carrier module interface card device and electric energy meter carrier module interface card device, be used for communicating to test described communication equipment, to communicate to test described electric energy meter and said low-voltage network channel characteristics analogue means is carried out the control that the low-voltage network channel characteristics is simulated with described electric energy meter carrier module interface card device with described concentrator carrier module interface card device.
Particularly, above-mentioned power conditioner device comprises: first order power purification circuit is used to the interference noise that internal system provides electric energy and the first predetermined matched impedance and isolating exterior power supply; Second level power purification circuit, the clutter that is used to isolate said internal system with crosstalk and electric energy be provided for said concentrator carrier module interface card device; The third level isolates power supply circuits, is used to isolate the carrier signal between said concentrator carrier module interface card device and the said electric energy meter carrier module interface card device.
Wherein, the third level isolates power supply circuits and comprises: isolating transformer is used to receive the signal from said second level power purification circuit, and this signal is carried out LPF, to filter high frequency clutter and noise; The calibration power source is used to isolate the carrier signal between said concentrator carrier module interface card device and the said electric energy meter carrier module interface card device; The linear impedance stable module is used to described electric energy meter carrier module interface card device the second predetermined matched impedance is provided.
Above-mentioned low-voltage network channel characteristics analogue means comprises: first high pass filter is used for the power frequency electric power signal of filtering power purification circuit output from the said second level, to obtain the high frequency carrier signal of communication; Noise injects the unit, is used for injecting noise to the high frequency carrier signal of communication of said first high pass filter output; The transition-line analogy unit is used for said noise is injected the transfer impedance simulation that the signal of exporting the unit carries out power line; Attenuation units is used for the signal of said transition-line analogy unit output is carried out loss decay simulation; Second high pass filter is used for that the signal of said attenuation units output and the said third level are isolated the power frequency electric power signal that power supply circuits export and superposes, and exports after the superposed signal obtaining; The multipath analogue unit is used for the superposed signal of said second high pass filter output is carried out multipath transmission interference simulation; Alternating current electronic load is used for the signal of said multipath analogue unit output is carried out the load impedance simulation.
Particularly; Above-mentioned noise injects the unit and comprises: serial communication interface chip, digital signal processing chip, caches chip, AD converter, DA transducer, carrier signal Acquisition Circuit, discharge circuit and power amplifier; Wherein: described serial communication interface chip is used for obtaining noise file from said centralized control computer; Described carrier signal Acquisition Circuit is used to receive the high frequency carrier signal of communication from said first high pass filter, and described high frequency carrier signal of communication is exported to described AD converter; Described digital signal processing chip; Be used for storing described noise file into said caches chip; And obtain noise data from described caches chip; Superpose so that the carrier data of described noise data and the output of said AD converter is carried out numeral, thereby form the blended data that aliasing has noise signal and carrier signal, and described blended data is exported to described DA transducer; Described discharge circuit is used for that the data of said DA transducer output are carried out voltage of signals and amplifies; Described power amplifier is used for the signal of said discharge circuit output is carried out power amplification.
Preferably, above-mentioned transition-line analogy unit is the RLC array.
Above-mentioned multipath analogue unit comprises: the path separation module is used for the carrier signal of said second high pass filter output is decomposed many transmission paths; The path simulation module is used for the carrier signal on every transmission paths is carried out delay operation and attenuation operations; The path synthesis module is used for the carrier signal that synthetic every transmission paths is exported.
Preferably; Above-mentioned low-voltage network channel characteristics analogue means also comprises: high pass is moved back lotus root module and low pass transformer; Wherein: described high pass decoupling module is used to extract the carrier signal of said second high pass filter output, and the low pass transformer is used for predetermined power frequency component is depressured to scheduled voltage; The output signal of high pass decoupling module is linked into described alternating current electronic load, so that the impedance variations of different frequency point to be provided by described alternating current electronic load with after the output signal of low pass transformer is connected.
By means of technique scheme, the present invention has realized the simulation to each main channel characteristics of low-voltage network through the control of centralized control computer to low-voltage network channel characteristics analogue means; Through the power conditioner device is that whole test system provides good working environment; Reduced of the influence of extraneous power supply noise to test result; Than prior art; The embodiment of the invention can be accurately comprehensive each item essential characteristic of analog electrical powerline carrier communication channel, and then can full test low voltage electric power carrier communication equipment, and realize simple, cost is less.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structured flowchart according to the test macro of the low voltage electric power carrier communication equipment of the embodiment of the invention;
Fig. 2 is another structured flowchart according to the test macro of the embodiment of the invention;
Fig. 3 is based on the detailed block diagram of the test macro of Fig. 2;
Fig. 4 is the circuit diagram according to the first order power purification circuit 11 of the embodiment of the invention;
Fig. 5 is the circuit diagram according to the second level power purification circuit 12 of the embodiment of the invention;
Fig. 6 is the circuit diagram of isolating power supply circuits 13 according to the third level of the embodiment of the invention;
Fig. 7 is the circuit diagram of first high pass filter 21 (perhaps second high pass filter 25) according to the embodiment of the invention;
Fig. 8 is the concrete structure block diagram that injects unit 22 according to the noise of the embodiment of the invention;
Fig. 9 is the circuit diagram according to the RLC array of the embodiment of the invention;
Figure 10 is the structured flowchart according to the multipath analogue unit 26 of the embodiment of the invention;
Figure 11 is the connection sketch map according to the alternating current electronic load 27 of the embodiment of the invention;
Figure 12 is the structured flowchart according to the concentrator carrier module interface card device 3 of the embodiment of the invention;
Figure 13 is the structured flowchart according to the electric energy meter carrier module interface card device 4 of the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
In view of existing low-voltage carrier communication analogue technique realizes complicacy, involves great expense; And can't be accurately comprehensively analog electrical powerline carrier communication channel each item essential characteristic and cause can't be to the low voltage electric power carrier communication testing equipment; The embodiment of the invention provides a kind of test macro of low voltage electric power carrier communication equipment; The simulation of the multiple channel characteristics index when low-voltage network being used as communication media in order to realization, thus can complete detection low voltage electric power carrier communication equipment.Below in conjunction with accompanying drawing the present invention is elaborated.
The embodiment of the invention provides a kind of test macro of low voltage electric power carrier communication equipment; As shown in Figure 1; This system comprises: power conditioner device 1, low-voltage network channel characteristics analogue means 2, concentrator carrier module interface card device 3, electric energy meter carrier module interface card device 4 and centralized control computer 5, wherein:
Low-voltage network channel characteristics analogue means 2; Be connected with the power conditioner device, be used for the signal of power conditioner device output is comprised the simulation of the low-voltage network channel characteristics of noise characteristic, transfer impedance characteristic, loss decay characteristics, multipath transmission interference characteristic and load impedance characteristic;
Concentrator carrier module interface card device 3 is connected with low-voltage network channel characteristics analogue means 2 with power conditioner device 1, and being used to the communication equipment that is connected with concentrator carrier module interface card device provides electric energy and provide communication to connect;
Electric energy meter carrier module interface card device 4 is connected with low-voltage network channel characteristics analogue means 2 with power conditioner device 1, and being used to the electric energy meter that is connected with electric energy meter carrier module interface card device provides electric energy and provide communication to connect;
Centralized control computer 5; Be connected with low-voltage network channel characteristics analogue means 2, concentrator carrier module interface card device and electric energy meter carrier module interface card device, be used for communicating with test communications equipment, communicating the control of carrying out the simulation of low-voltage network channel characteristics with the test electric energy meter and to low-voltage network channel characteristics analogue means with electric energy meter carrier module interface card device with concentrator carrier module interface card device.
Can know by above description; Through of the control of centralized control computer to low-voltage network channel characteristics analogue means; Realized simulation, and be that whole test system provides good working environment, reduced of the influence of extraneous power supply noise test result through the power conditioner device to each main channel characteristics of low-voltage network; Than prior art; The embodiment of the invention can be accurately comprehensive each item essential characteristic of analog electrical powerline carrier communication channel, and then can full test low voltage electric power carrier communication equipment, and realize simple, cost is less.
In order further to understand the embodiment of the invention, below the test macro of low voltage electric power carrier communication equipment is carried out detailed description.
Fig. 2 is another structured flowchart according to the test macro of the embodiment of the invention, and is as shown in Figure 2, and power conditioner device 1 provides stable and clean supply of electrical energy for a whole set of analogue system, isolates extraneous noise jamming, the internal driving of stable simulation system; The simulation that low-voltage network channel characteristics analogue means 2 is accomplished each main channel characteristics of low-voltage network comprises noise characteristic, transmission line impedance characteristic, load impedance characteristic, multipath fading characteristic and line loss characteristic; Concentrator carrier module interface card device 3 is responsible for the tested concentrator carrier modules of physical connection, and for its power supply with provide carrier communication to be connected; Electric energy meter carrier module interface card device 4 is responsible for the tested electric energy meter carrier modules of physical connection, and for its power supply with provide carrier communication to be connected; Centralized control computer 5 establishes a communications link with electric energy meter carrier module interface card device 4 through 485 signal of communication lines and concentrator carrier module interface card device 3; Send test packet respectively to tested concentrator carrier module and tested electric energy meter carrier module; And receive the communication message that tested concentrator carrier module or tested electric energy meter carrier module return, in order to checking communication success or not; Centralized control computer 5 also is used for realizing the control to the 2 various characteristic simulations of low-voltage network channel characteristics analogue means in addition.
Pass through the embodiment of the invention; Can realize the simulation of the multiple channel characteristics index when low-voltage network used as communication media; The channel index frequency band range that can simulate low-voltage network is 10kHz～500kHz; The low-voltage network channel circumstance analog functuion that can realize comprises that noise characteristic simulation, transmission line impedance characteristic are simulated, the load impedance characteristic is simulated, the network multi-path decay characteristics is simulated and the simulation of signal line loss characteristics, thereby can accomplish the quantitative test of the indexs such as emitting performance, transmitting-receiving success rate, reception success rate, receiving sensitivity, antidamping ability, noise resisting ability and impedance adaptability to the low voltage electric power carrier communication device.
Fig. 3 is based on the detailed block diagram of the test macro of Fig. 2, below in conjunction with structure shown in Figure 3, above-mentioned each device is carried out detailed description respectively.
(1) the power conditioner device 1
As shown in Figure 3, this power conditioner device 1 comprises:
First order power purification circuit 11 is used to the interference noise that internal system provides electric energy and the first predetermined matched impedance and isolating exterior power supply; The first predetermined matched impedance here can be provided with by system in advance, and for example, this first predetermined matched impedance can be 50 ohm impedance;
Second level power purification circuit 12 is used for the inner clutter of shielding system and crosstalks and for concentrator carrier module interface card device electric energy is provided;
The third level isolates power supply circuits 13, is used to isolate the carrier signal between concentrator carrier module interface card device and the electric energy meter carrier module interface card device.
Particularly, the noise in the first order power purification circuit 11 load isolation mains-supplied power supplys, and with the impedance matching to 50 of analogue system ohm, the circuit of isolating through first order power purification circuit 11 be that the analog circuit in this test macro is supplied power with device; Second level power purification circuit 12 is responsible for isolating the clutter that auxiliary circuit produces in this analogue system and crosstalking, and the circuit of isolating through second level power purification circuit 12 is concentrator carrier module interface card device 4 and the concentrator carrier module power supply of going up assembling thereof; The third level isolates power supply circuits 13 and is responsible for realizing the high-frequency signal isolation between concentrator carrier module interface card device 4 and the electric energy meter carrier module interface card device 5; Isolate power supply circuits 13 through the third level and can stop the carrier signal between electric energy meter carrier module and the concentrator carrier module to be crosstalked mutually, be merely able to traffic channel through appointment through electric power loop.
In order further to understand power conditioner device 1, below respectively three grades of above-mentioned circuit are carried out detailed description.
Fig. 4 is the circuit diagram of first order power purification circuit 11, and is as shown in Figure 4, and first order power purification circuit 11 is made up of isolating transformer and impedance stabilization circuit, wherein: isolate transforming circuit T1 and carry out signal filtering first; Fuse U1 is used to ensure that electric current meets the requirements; Inductance (L1, L2), electric capacity (C1, C2) and resistance (R1; R2) form first order LPF and impedance stabilization loop, and inductance (L3, L4), electric capacity (C3; C4) and resistance (R3 R4) forms second level LPF and impedance stabilization loop, inductance (L5; L6), electric capacity (C5, C6) and resistance (R5 R6) forms third level LPF and impedance stabilization loop.
The isolation disturbed to external world can be realized through isolating transformer, stable to the purification of high-frequency noise and channel impedance can be realized through the linear impedance stabilizing circuit.
Fig. 5 is the circuit diagram of second level power purification circuit 12, and is as shown in Figure 5, and second level power purification circuit 12 is made up of the low pass choke circuit, and wherein fuse U1 is used to ensure that electric current meets the requirements, inductance (L1, L2) and electric capacity (C1) form the LPF loop.
Through second level power purification circuit 12, the clutter that various servicing units in can the isolation test system and channel characteristics analog circuit are produced with crosstalk.
Fig. 6 is the circuit diagram that the third level isolates power supply circuits 13, and is as shown in Figure 6, and the third level isolates power supply circuits 13 and comprises: isolating transformer 131, calibration power source 132 and linear impedance stable module 133.Wherein, isolating transformer 131 is used to receive the signal from second level power purification circuit 12, and this signal is carried out LPF, to filter high frequency clutter and noise; Calibration power source 132 is used to isolate the carrier signal between concentrator carrier module interface card device and the electric energy meter carrier module interface card device; Promptly; The electric power signal of input and output is isolated fully, guarantee that the electrical characteristic between concentrator carrier module interface card device and the electric energy meter carrier module interface card device is isolated, and; Because only adopt the voltage circuit in calibration power source 132, circuit load will reduce; Linear impedance stable module 133 is used to electric energy meter carrier module interface card device the second predetermined matched impedance is provided, and this second predetermined matched impedance is 50 ohm of matched impedances of standard.
Isolate power supply circuits 13 through the third level and can realize the high-frequency signal isolation between concentrator carrier module interface card device and the electric energy meter carrier module interface card device; Make the carrier signal between electric energy meter carrier module and the concentrator carrier module to crosstalk mutually, be merely able to traffic channel through appointment through electric power loop.
(2) low-voltage network channel characteristics analogue means 2
As shown in Figure 2, low-voltage network channel characteristics analogue means 2 comprises:
First high pass filter 21 is used for the power frequency electric power signal of filtering power purification circuit output from the second level, to obtain the high frequency carrier signal of communication;
Noise injects unit 22, is used for injecting noise to the high frequency carrier signal of communication of first high pass filter output;
Transition-line analogy unit 23 is used for noise is injected the transfer impedance simulation that the signal of exporting the unit carries out power line;
Second high pass filter 25 is used for that the signal of attenuation units output and the third level are isolated the power frequency electric power signal (for example, the 220V power frequency component) that power supply circuits export and superposes, and exports after the superposed signal obtaining;
Multipath analogue unit 26 is used for the superposed signal of second high pass filter output is carried out multipath transmission interference simulation;
Alternating current electronic load 27 is used for the signal of multipath analogue unit output is carried out the load impedance simulation.
In order further to understand low-voltage network channel characteristics analogue means 2, below above-mentioned each unit is described respectively.
Fig. 7 is the circuit diagram of first high pass filter 21 and second high pass filter 25, and is as shown in Figure 7, and (C1 C2) forms the high-pass filtering loop for mutual inductor (T1) and electric capacity; Fuse (U1) is used to ensure that electric current meets the requirements; (D1 D2) is used to provide overvoltage protection to voltage stabilizing didoe.Can filtering power frequency electric power signal through first high pass filter (21), thus the carrier signal of extracting; Through second high pass filter (25) the 220V power frequency electric power circuit that can the high frequency carrier signal of communication of attenuation units output be coupled back.
Fig. 8 is the concrete structure block diagram that noise injects unit 22 (also can be called set of digits accepted way of doing sth noise simulation unit); As shown in Figure 8, this noise injects unit 22 and comprises: serial communication interface chip 221, digital signal processing chip 222, caches chip 223, carrier signal Acquisition Circuit 224, AD converter 225, DA transducer 226, discharge circuit 227 and power amplifier 228.The operation principle that noise injects unit 22 is:
Serial communication interface chip 221 obtains noise file from the centralized control computer; Carrier signal Acquisition Circuit 224 receives the high frequency carrier signal of communication from first high pass filter 21, and the high frequency carrier signal of communication is exported to AD converter 225; Digital signal processing chip 222 stores noise file in the caches chip 223 into; And obtain noise data from the caches chip; So that the carrier data of noise data and AD converter 225 outputs is carried out the numeral stack; Thereby form the blended data that aliasing has noise signal and carrier signal, and blended data is exported to DA transducer 226; Then, discharge circuit 227 carries out the voltage of signals amplification with the data of DA transducer 226 outputs; Afterwards, power amplifier 228 carries out power amplification with the signal of discharge circuit 227 outputs, thereby accomplishes the noise injection process.
Particularly, serial communication interface chip 221 is used for obtaining noise file from centralized control computer 5; The noise file that obtains will store into through the transmission path data channel of digital signal processing chip 222 in the caches chip 223; At needs when carrier signal is injected noise; Digital signal processing chip 222 will read the high speed noise data by the data transfer rate with 30Msps from caches chip 223; And the carrier data of itself and AD converter 225 inputs is carried out numeral superpose; Forming aliasing has the mixed output signal of noise signal and carrier signal, and outputs it to DA transducer 226; Carrier signal Acquisition Circuit 224 obtains the signal of carrier wave frequency range from first high pass filter 21, and is injected in the AD converter 225 and realizes the transformation of analog signal to digital signal; DA transducer 226 is accomplished the transformation of digital signal to analog signal; The hybrid analog-digital simulation signal will be sent to and carry out the voltage of signals amplification in the discharge circuit 227 afterwards; Last signal will be imported into and carry out power amplification in the power amplifier 228; So far accomplish the injection process of interchannel noise.
The process of above-mentioned noise stack can be according to following formula:
s(i)＝A·n(i-M)+p(i) i＝1…N
Wherein, s (i) representes mixed output signal, and p (i) explains carrier data, and data length is N, and n (i) expression high speed noise data, M represent that the noise time-delay counts, and A representes the noise amplitude weights.
Inject unit 22 through noise and obtain the noise waveform file, be translated into analog signal, finally be injected on the carrier communication channel, thereby accomplish the noise simulation process from centralized control computer 5.Than separate apparatus formula noise simulation of the prior art system, the noise of the embodiment of the invention injects that the volume of unit is obviously less, and the noise type that can simulate is also more, and simple to operate, equipment manufacturing cost is low.
In the practical implementation process, transition-line analogy unit 23 can be the RLC array, is used to realize the simulation to low-voltage network transmission line impedance situation of change.In the present embodiment, the design of RLC array can the reference transmission line model design, particularly, can be according to following non uniform transmission line model formation:
In the formula, R (v), (v), (v), (C leads G L, electric capacity by resistance, inductance, the electricity that v) is respectively lead.V is the general name of the changing factor of impedance operator, is referred to as v type non-uniform circuit equation.
Fig. 9 is the circuit diagram of RLC array, and is as shown in Figure 9, and (R3 R7) is used to realize the coarse adjustment to transmission line series impedance situation to resistance for R1, R2, and (J3 J4) controls for J1, J2, and sliding, (R5 R6) is used to realize the fine setting to the series impedance situation in the change resistance through switch; Sliding, (L3 L4) is used to realize the adjustment to transmission line series connection induction reactance in the change sense; The change resistance R4 that slides is used to realize the fine setting to the parallel impedance situation; Slip transfiguration C2 is used to realize the fine setting to the transmission line capacitive reactance, and (C3 C4) is used to realize the coarse adjustment to the transmission line capacitive reactance to electric capacity.
Above-mentioned attenuation units 24 can realize the simulation to the low-voltage power line loss; Particularly, this attenuation units 24 can be made up of Agilent 8494G programmable attenuator, Agilent 8496G programmable attenuator, Agilent 11713C attenuator driver and the interconnected external member of Agilent 11716 attenuators.
Figure 10 is the structured flowchart of multipath analogue unit 26, and is shown in figure 10, and multipath analogue unit 26 comprises:
Particularly; The simulation process of multipath transmission characteristic is: path separation module 261 decomposes input signal on n the different transmission path; Signal on 262 pairs of every transmission paths of path simulation module is delayed time and attenuation processing; Path synthesis module 263 so far, has been accomplished the simulation process of multipath transmission characteristic with the synthetic more total output signal of the signal of n paths output.
Above-mentioned alternating current electronic load 27 is used to accomplish the simulation to the low-voltage network load impedance characteristic.Alternating current electronic load is a kind of device of load (for example, the household electrical appliance) characteristic in can simulation true environment, generally in order to detect the quality of power supply.The principle of alternating current electronic load is: control internal power MOSFET or transistorized conducting amount (amount duty ratio size), lean on the equipment of the dissipation power consumed power of power tube.Alternating current electronic load can accurately detect load voltage, accurately adjusts load current, can realize the fictitious load short circuit simultaneously, and the perceptual resistive and capacitive of fictitious load changes, and realizes the adjusting of capacitive load currents rise time.
In the practical implementation process; Above-mentioned low-voltage network channel characteristics analogue means also comprises: high pass is moved back lotus root module and low pass transformer; High pass decoupling module is used to extract the carrier signal of said second high pass filter output; The low pass transformer is used for predetermined power frequency component (for example, the 220V power frequency component) is depressured to scheduled voltage, and this predetermined voltage is provided with by system in advance.In the specific implementation, the output signal of high pass decoupling module is linked into alternating current electronic load 27, so that the impedance variations of different frequency point to be provided by alternating current electronic load 27 with after the output signal of low pass transformer is connected.
Particularly, when adopting the AC system electronic load, when simulating the impedance variations of big numerical value, can directly incorporate it into 220V power line loop; When the impedance variations of simulation fractional value, need the AC bias voltage of 10Vac at least be provided for it, but very big bias voltage can not be provided, otherwise its impedance simulation context can be affected.Therefore need utilize the low pass transformer will import 220V voltage and carry out transformation and export to alternating current electronic load as AC bias voltage after for 11V, utilize high pass decoupling module again, separately carrier signal extracted, export to AC load, carry out the simulation of impedance.
Figure 11 is the connection sketch map of alternating current electronic load 27, and is shown in figure 11, and 220V high pass decoupling module 28 is used to extract the carrier signal on the power line of second high pass filter output; 20:1 low pass transformer 29 is used for the 220V power frequency component is depressured to 11V; The output signal of 220V high pass decoupling module 28 is with after the output signal of 20:1 low pass transformer 29 is connected, and incoming transport electronic load 27 is by the impedance variations of its simulation different frequency point.
Can be known that by above description the beneficial effect of the low-voltage network noise characteristic analogue means of present embodiment is: (1) owing to adopt the on-the-spot noise playback technology based on big capacity storage module, noise situations that can realistic simulation actual motion environment; (2) owing to utilize the RLC array to realize simulation, utilize the active electronic load device to realize simulation, make that dynamic range is big, analog spectrum characteristic changeability is strong actual power load to the power line transmission impedance; (3) owing to adopt multipath and decay analog circuit, realized simulation, but made that simulaed path quantity is big, the path parameter changeability is strong low-voltage network multipath fading and line loss decay characteristics based on embedded path matrix calculation unit.
(3) concentrator carrier module interface card device 3
Figure 12 is the structured flowchart of concentrator carrier module interface card device 3; Shown in figure 12; This concentrator carrier module interface card device 3 comprises: comprise that concentrator carrier module socket 31, power frequency filter circuit 32, test instruction generate chip 33,485 serial communication chips 34 and 220V ac power circuit 35, wherein: concentrator carrier module socket 31 is used for physics and is connected the concentrator carrier communication module with circuit; Power frequency filter circuit 32 is used for filtering 50Hz power frequency component, is transferred to test instruction generation chip 33 to extract carrier signal; Test instruction generates chip 33 and is used for generating at random test instruction, and sends and should instruct to the concentrator carrier communication module; 485 serial communication chips 34 are used to realize the two-way communication with centralized control computer 5; The circuit that 220V ac power circuit 35 is used on the concentrator carrier module interface card device 3 provides supply of electrical energy.
(4) electric energy meter carrier module interface card device 4
Figure 13 is the structured flowchart of electric energy meter carrier module interface card device 4; Shown in figure 13; Electric energy meter carrier module interface card device 4 comprises: electric energy meter carrier module socket 41, power frequency filter circuit 42,485 serial communication chips 43 and 220V ac power circuit 44, and wherein: electric energy meter carrier module socket 41 is used for physics and is connected the concentrator carrier communication module with circuit; Power frequency filter circuit 42 is used for filtering 50Hz power frequency component, is transferred to centralized control computer 5 to extract carrier signal; 485 serial communication chips 43 are used to realize the two-way communication with centralized control computer 5; The circuit that 220V ac power circuit 44 is used on the electric energy meter carrier module interface card circuit 4 provides supply of electrical energy.
(5) the centralized control computer 5
5 pairs of low-voltage network channel characteristics of centralized control computer analogue means carries out centralized operation; Can realize the automation and the Long-distance Control of channel simulation flow process; Avoided manually-operated wrong hidden danger; Reduce external interference, in shielded enclosure, carried out the test job of channel simulation and carrier communication product after being convenient to.
The test macro that the embodiment of the invention provides is integrated to the analog capability of the exclusive complicated noise of low-voltage network, impedance nonlinear change characteristic, network multi-path decay characteristics and loss of signal characteristic; Through this test macro, can accomplish the quantitative test of indexs such as emitting performance, transmitting-receiving success rate, reception success rate, receiving sensitivity, antidamping ability, noise resisting ability and impedance adaptability to the low voltage electric power carrier communication device.Than prior art, the test macro of the embodiment of the invention is realized simply, cost is less and can accurately comprehensively simulate each item essential characteristic of low-voltage powerline carrier communication channel.
In sum, the test macro that provides of the embodiment of the invention comprises following beneficial effect:
(1) system can the comprehensive simulated low-voltage network noise characteristic, transmission line impedance characteristic, load impedance characteristic, multipath fading characteristic and line loss characteristic, thus can full test low voltage electric power carrier communication equipment;
(2) through adopting three grades of purifications and insulating power supply circuit, can realize disturbing to external world the effective isolation with noise, simultaneously for analogue system provides matched impedance, can realize the good electrical isolation of tested concentrator carrier module and electric energy meter carrier module;
(3) adopt low-voltage network channel characteristics analogue means, can realize simulation the online complicated noise jamming characteristic of low-voltage distribution;
(4) utilize RLC array simulation electric power transmission line impedance, this and transmission line impedance model consistency are stronger;
(5) introduce the attenuation units that Agilent attenuator external member is formed, can realize the simulation to the power line transmission loss, the analog frequency band scope can reach 4GHz, and attenuation range can reach 121dB;
(6) the multipath analogue unit can be realized the simulation to different transmission path time-delay and influence of fading in the transmission of low-voltage network signal multipath;
(7) introduce alternating current electronic load and accomplish simulation the low-voltage network load impedance characteristic; Can accurately detect load voltage; Accurately adjust load current; Simultaneously can realize the fictitious load short circuit, the perceptual resistive and capacitive of fictitious load changes, and realizes the adjusting of capacitive load currents rise time;
(8) adopt the centralized control computer that all analog circuits and device are carried out centralized operation; Can realize the automation and the Long-distance Control of channel simulation flow process; Avoided manually-operated wrong hidden danger; Reduce external interference, in shielded enclosure, carried out the test job of channel simulation and carrier communication product after being convenient to;
(9) adopted closed communication channel, in test and verification process, can not introduce extra noise and signal skew, signal imitation is accurate, and spectral range covers face width;
(10) a whole set of test circuit can be integrated into electric energy dial framework and control computer of an embedded circuit box, has obviously reduced system cost and probability of malfunction, is convenient to produce in batches and apply.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the test macro of a low voltage electric power carrier communication equipment is characterized in that, described system comprises:
Power conditioner device, low-voltage network channel characteristics analogue means, concentrator carrier module interface card device, electric energy meter carrier module interface card device and centralized control computer, wherein:
Described power conditioner device, be used to internal system electric energy and matched impedance, isolation interference noise are provided and isolate said concentrator carrier module interface card device and said electric energy meter carrier module interface card device between carrier signal;
Described low-voltage network channel characteristics analogue means; Be connected with described power conditioner device, be used for the signal of said power conditioner device output is comprised the simulation of the low-voltage network channel characteristics of noise characteristic, transfer impedance characteristic, loss decay characteristics, multipath transmission interference characteristic and load impedance characteristic;
Described concentrator carrier module interface card device; Be connected with low-voltage network channel characteristics analogue means with described power conditioner device, being used to the communication equipment that is connected with said concentrator carrier module interface card device provides electric energy and provides communication to connect;
Described electric energy meter carrier module interface card device is connected with low-voltage network channel characteristics analogue means with described power conditioner device, and being used to the electric energy meter that is connected with said electric energy meter carrier module interface card device provides electric energy and provide communication to connect;
Described centralized control computer; Be connected with described low-voltage network channel characteristics analogue means, concentrator carrier module interface card device and electric energy meter carrier module interface card device, be used for communicating to test described communication equipment, to communicate to test described electric energy meter and said low-voltage network channel characteristics analogue means is carried out the control that the low-voltage network channel characteristics is simulated with described electric energy meter carrier module interface card device with described concentrator carrier module interface card device.
2. system according to claim 1 is characterized in that, described power conditioner device comprises:
First order power purification circuit is used to the interference noise that internal system provides electric energy and the first predetermined matched impedance and isolating exterior power supply;
Second level power purification circuit, the clutter that is used to isolate said internal system with crosstalk and electric energy be provided for said concentrator carrier module interface card device;
The third level isolates power supply circuits, is used to isolate the carrier signal between said concentrator carrier module interface card device and the said electric energy meter carrier module interface card device.
3. system according to claim 2 is characterized in that, the described third level isolates power supply circuits and comprises:
Isolating transformer is used to receive the signal from said second level power purification circuit, and this signal is carried out LPF, to filter high frequency clutter and noise;
The calibration power source is used to isolate the carrier signal between said concentrator carrier module interface card device and the said electric energy meter carrier module interface card device;
The linear impedance stable module is used to described electric energy meter carrier module interface card device the second predetermined matched impedance is provided.
4. system according to claim 3 is characterized in that, described low-voltage network channel characteristics analogue means comprises:
First high pass filter is used for the power frequency electric power signal of filtering power purification circuit output from the said second level, to obtain the high frequency carrier signal of communication;
Noise injects the unit, is used for injecting noise to the high frequency carrier signal of communication of said first high pass filter output;
The transition-line analogy unit is used for said noise is injected the transfer impedance simulation that the signal of exporting the unit carries out power line;
Attenuation units is used for the signal of said transition-line analogy unit output is carried out loss decay simulation;
Second high pass filter is used for that the signal of said attenuation units output and the said third level are isolated the power frequency electric power signal that power supply circuits export and superposes, and exports after the superposed signal obtaining;
The multipath analogue unit is used for the superposed signal of said second high pass filter output is carried out multipath transmission interference simulation;
Alternating current electronic load is used for the signal of said multipath analogue unit output is carried out the load impedance simulation.
5. system according to claim 4 is characterized in that, described noise injects the unit and comprises:
Serial communication interface chip, digital signal processing chip, caches chip, AD converter, DA transducer, carrier signal Acquisition Circuit, discharge circuit and power amplifier, wherein:
Described serial communication interface chip is used for obtaining noise file from said centralized control computer;
Described carrier signal Acquisition Circuit is used to receive the high frequency carrier signal of communication from said first high pass filter, and described high frequency carrier signal of communication is exported to described AD converter;
Described digital signal processing chip; Be used for storing described noise file into said caches chip; And obtain noise data from described caches chip; Superpose so that the carrier data of described noise data and the output of said AD converter is carried out numeral, thereby form the blended data that aliasing has noise signal and carrier signal, and described blended data is exported to described DA transducer;
Described discharge circuit is used for that the data of said DA transducer output are carried out voltage of signals and amplifies;
Described power amplifier is used for the signal of said discharge circuit output is carried out power amplification.
6. system according to claim 4 is characterized in that, described transition-line analogy unit is the RLC array.
7. system according to claim 4 is characterized in that, described multipath analogue unit comprises:
The path separation module is used for the carrier signal of said second high pass filter output is decomposed many transmission paths;
The path simulation module is used for the carrier signal on every transmission paths is carried out delay operation and attenuation operations;
The path synthesis module is used for the carrier signal that synthetic every transmission paths is exported.
8. system according to claim 4 is characterized in that, described low-voltage network channel characteristics analogue means also comprises:
High pass is moved back lotus root module and low pass transformer, wherein:
Described high pass decoupling module is used to extract the carrier signal of said second high pass filter output, and the low pass transformer is used for predetermined power frequency component is depressured to scheduled voltage; The output signal of high pass decoupling module is linked into described alternating current electronic load, so that the impedance variations of different frequency point to be provided by described alternating current electronic load with after the output signal of low pass transformer is connected.
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