CN102655422B - 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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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 of electric energy terminal and the operation of electric power system.Low-voltage powerline carrier communication is used power line as transmission medium, firm in structure, therefore that power line is higher as the communication medium dependability due to power line.
Because power line is mainly for power consumption equipment transmits electric energy, so its characteristic is difficult to directly meet 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 impedance matching performance is poorer, and noise circumstance is more severe, and the decay that signal transmits thereon 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 to the performance of power line carrier communication product.
In order to pass judgment on the communication performance of low-voltage carrier communication product, for it provides guidance at the reliability application under full-scale condition, present stage is in the urgent need to a kind of communication performance test macro of low pressure carrier wave equipment, to realize Validity Test and the assessment to carrier equipment, the quality control of reinforcement to carrier communication equipment, and the key of this test macro is exactly how to carry out the simulation of low-voltage network feature.
Existing low-voltage carrier communication analogue system mainly consists 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 not designs for carrier communication specially, therefore 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 simulation process, can't the slice-of-life dynamic variation characteristic, very large 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 defect that every 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 present 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 defect that every 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 present invention provides a kind of test macro of low voltage electric power carrier communication equipment, this system comprises: power line cleaner, 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 line cleaner, be used to internal system that electric energy and matched impedance are provided, the isolation interference noise, and isolate the carrier signal between described concentrator carrier module interface card device and described electric energy meter carrier module interface card device, described low-voltage network channel characteristics analogue means, be connected with described power line cleaner, comprised the simulation of the low-voltage network channel characteristics of noise characteristic, transfer impedance feature, loss decay characteristics, Multipath Transmission interference characteristic and load impedance feature for the signal to described power line cleaner output, described concentrator carrier module interface card device, be connected with low-voltage network channel characteristics analogue means with described power line cleaner, be used to the communication equipment be connected with described concentrator carrier module interface card device electric energy to be provided and communication connection is provided, described electric energy meter carrier module interface card device, be connected with low-voltage network channel characteristics analogue means with described power line cleaner, is used to the electric energy meter be connected with described electric energy meter carrier module interface card device electric energy to be provided and communication connection is provided, described centralized control computer, 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 connected, for described concentrator carrier module interface card device, communicating to test described communication equipment, with described electric energy meter carrier module interface card device, communicate the control of testing described electric energy meter and described low-voltage network channel characteristics analogue means being carried out to the simulation of low-voltage network channel characteristics.
Particularly, above-mentioned power line cleaner comprises: first order power purification circuit is used to internal system that the interference noise of electric energy and the first predetermined matched impedance and isolating exterior power supply is provided; Second level power purification circuit, for the clutter of isolating described internal system with crosstalk and provide electric energy for described concentrator carrier module interface card device; Third level isolation power supply circuits, for isolating the carrier signal between described concentrator carrier module interface card device and described electric energy meter carrier module interface card device.
Wherein, third level isolation power supply circuits comprise: isolating transformer, for receiving the signal from described second level power purification circuit, and carry out low-pass filtering to this signal, to filter high frequency clutter and noise; The calibration power source, for isolating the carrier signal between described concentrator carrier module interface card device and described electric energy meter carrier module interface card device; The linear impedance stable module, be used to described electric energy meter carrier module interface card device that the second predetermined matched impedance is provided.
Above-mentioned low-voltage network channel characteristics analogue means comprises: the first high pass filter, for filtering from the power frequency electric power signal of described second level power purification circuit output, to obtain the high frequency carrier signal of communication; Noise injects unit, for the high frequency carrier signal of communication to described the first high pass filter output, injects noise; The transition-line analogy unit, carry out the transfer impedance simulation of power line for the signal that described noise is injected to unit output; Attenuation units, carry out loss decay simulation for the signal to the output of described transition-line analogy unit; The second high pass filter, the power frequency electric power signal of exporting for the signal by the output of described attenuation units and described third level isolation power supply circuits is superposeed, and after superposed signal, exports obtaining; The multipath analogue unit, carry out the Multipath Transmission interference simulation for the superposed signal to described the second high pass filter output; Alternating current electronic load, carry out the load impedance simulation for the signal to described multipath analogue unit output.
Particularly, above-mentioned noise injects 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, for from described centralized control computer, obtaining noise file; Described carrier signal Acquisition Circuit, for receiving the high frequency carrier signal of communication from described the first high pass filter, and export to described AD converter by described high frequency carrier signal of communication; Described digital signal processing chip, for storing described noise file into described caches chip, and obtain noise data from described caches chip, carry out numbers pile up with the carrier data by described noise data and the output of described AD converter, thereby form aliasing, the blended data of noise signal and carrier signal is arranged, and described blended data is exported to described DA transducer; Described discharge circuit, carry out the voltage amplification of signal for the data by described DA transducer output; Described power amplifier, carry out power amplification for the signal by described discharge circuit output.
Preferably, above-mentioned transition-line analogy unit is the RLC array.
Above-mentioned multipath analogue unit comprises: the path separation module decomposes many transmission paths for the carrier signal by described the second high pass filter output; The path simulation module, carry out delay operation and attenuation operations for the carrier signal by every transmission paths; The path synthesis module, for the synthesis of the carrier signal of every transmission paths output.
Preferably, above-mentioned low-voltage network channel characteristics analogue means also comprises: high pass decoupling module and low pass transformer, wherein: described high pass decoupling module is for extracting the carrier signal of described the second high pass filter output, and the low pass transformer is depressured to scheduled voltage for being scheduled to power frequency component; The output signal of high pass decoupling module, with after the output signal of low pass transformer is connected, is linked into described alternating current electronic load, so that the impedance variation of different frequency point to be provided by described alternating current electronic load.
By means of technique scheme, the present invention is the control to low-voltage network channel characteristics analogue means by the centralized control computer, has realized the simulation to each main channel characteristics of low-voltage network; Provide good operational environment by power line cleaner for whole test macro, reduced the impact of extraneous power supply noise on test result, than prior art, the embodiment of the present invention is every essential characteristic of comprehensive analog electrical powerline carrier communication channel accurately, and then can full test low voltage electric power carrier communication equipment, and realize simple, spend less.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 present invention;
Fig. 2 is another structured flowchart according to the test macro of the embodiment of the present 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 present invention;
Fig. 5 is the circuit diagram according to the second level power purification circuit 12 of the embodiment of the present invention;
Fig. 6 is the circuit diagram according to the third level isolation power supply circuits 13 of the embodiment of the present invention;
Fig. 7 is according to the first high pass filter 21(of the embodiment of the present invention or the second high pass filter 25) circuit diagram;
Fig. 8 injects the concrete structure block diagram of unit 22 according to the noise of the embodiment of the present invention;
Fig. 9 is the circuit diagram according to the RLC array of the embodiment of the present invention;
Figure 10 is the structured flowchart according to the multipath analogue unit 26 of the embodiment of the present invention;
Figure 11 is the connection diagram according to the alternating current electronic load 27 of the embodiment of the present invention;
Figure 12 is the structured flowchart according to the concentrator carrier module interface card device 3 of the embodiment of the present invention;
Figure 13 is the structured flowchart according to the electric energy meter carrier module interface card device 4 of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
In view of existing low-voltage carrier communication analogue technique realizes complexity, involves great expense, and can't be accurately comprehensively analog electrical powerline carrier communication channel every essential characteristic and cause can't be to the low voltage electric power carrier communication testing equipment, the embodiment of the present invention provides a kind of test macro of low voltage electric power carrier communication equipment, the simulation of the multiple channel characteristics index while in order to realization, low-voltage network being used as communication media, thus can complete detection low voltage electric power carrier communication equipment.Below in conjunction with accompanying drawing, the present invention is described in detail.
The embodiment of the present invention provides a kind of test macro of low voltage electric power carrier communication equipment, as shown in Figure 1, this system comprises: power line cleaner 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 power line cleaner, comprised the simulation of the low-voltage network channel characteristics of noise characteristic, transfer impedance feature, loss decay characteristics, Multipath Transmission interference characteristic and load impedance feature for the signal to power line cleaner output;
Concentrator carrier module interface card device 3, be connected with low-voltage network channel characteristics analogue means 2 with power line cleaner 1, is used to the communication equipment be connected with concentrator carrier module interface card device electric energy to be provided and communication connection is provided;
Electric energy meter carrier module interface card device 4, be connected with low-voltage network channel characteristics analogue means 2 with power line cleaner 1, is used to the electric energy meter be connected with electric energy meter carrier module interface card device electric energy to be provided and communication connection is provided;
Centralized control computer 5, 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 connected, for concentrator carrier module interface card device, communicating with test communications equipment, with electric energy meter carrier module interface card device, communicate the control of testing electric energy meter and low-voltage network channel characteristics analogue means being carried out to the simulation of low-voltage network channel characteristics.
As seen from the above description, control by the centralized control computer to low-voltage network channel characteristics analogue means, realized the simulation to each main channel characteristics of low-voltage network, and provide good operational environment by power line cleaner for whole test macro, reduced the impact of extraneous power supply noise on test result, than prior art, the embodiment of the present invention is every essential characteristic of comprehensive analog electrical powerline carrier communication channel accurately, and then can full test low voltage electric power carrier communication equipment, and realize simple, spend less.
In order further to understand the embodiment of the present invention, below the test macro of low voltage electric power carrier communication equipment is described in detail.
Fig. 2 is another structured flowchart according to the test macro of the embodiment of the present invention, and as shown in Figure 2, power line cleaner 1 provides stable and clean electric power supply 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 completes each main channel characteristics of low-voltage network, comprise noise characteristic, transmission line impedance feature, load impedance feature, multipath fading feature and line loss feature; Concentrator carrier module interface card device 3 is responsible for the tested concentrator carrier module 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 module of physical connection, and for its power supply with provide carrier communication to be connected; Centralized control computer 5 establishes a communications link by 485 signal of communication lines and concentrator carrier module interface card device 3 and electric energy meter carrier module interface card device 4, send respectively test packet 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 is also for realizing the control to low-voltage network channel characteristics analogue means 2 various characteristic simulations in addition.
Pass through the embodiment of the present invention, the simulation of the multiple channel characteristics index in the time of can realizing low-voltage network is used as communication media, the Information 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 the noise characteristic simulation, the transmission line impedance characteristic simulation, the load impedance characteristic simulation, the simulation of network multi-path decay characteristics and the simulation of signal line loss characteristics, thereby can complete the emitting performance to the low voltage electric power carrier communication device, the transmitting-receiving success rate, successful receiving rate, receiving sensitivity, the antidamping ability, the quantitative test of the indexs such as noise resisting ability and impedance adaptability.
Fig. 3 is based on the detailed block diagram of the test macro of Fig. 2, below in conjunction with the structure shown in Fig. 3, above-mentioned each device is described in detail respectively.
(1) power line cleaner 1
As shown in Figure 3, this power line cleaner 1 comprises:
First order power purification circuit 11, be used to internal system that the interference noise of electric energy and the first predetermined matched impedance and isolating exterior power supply is provided; The first predetermined matched impedance here can be set in advance by system, and for example, this first predetermined matched impedance can be the impedance of 50 ohm;
Second level power purification circuit 12, for the clutter of shielding system inside with crosstalk and provide electric energy for concentrator carrier module interface card device;
Third level isolation power supply circuits 13, for isolating the carrier signal between concentrator carrier module interface card device and electric energy meter carrier module interface card device.
Particularly, the noise in first order power purification circuit 11 load isolation mains-supplied power supplys, and, by the impedance matching to 50 of analogue system ohm, the circuit of isolating through first order power purification circuit 11 is analog circuit and the device power supply in this test macro; Second level power purification circuit 12 is responsible for the clutter that in this analogue system of isolation, auxiliary circuit produces and is crosstalked, the concentrator carrier module power supply that the circuit of isolating through second level power purification circuit 12 is concentrator carrier module interface card device 4 and upper assembling thereof; Third level isolation power supply circuits 13 are responsible for realizing the high-frequency signal isolation between concentrator carrier module interface card device 4 and electric energy meter carrier module interface card device 5, isolate power supply circuits 13 by the third level and can stop the carrier signal between electric energy meter carrier module and concentrator carrier module to be crosstalked mutually by electric power loop, be merely able to the traffic channel by appointment.
In order further to understand power line cleaner 1, below respectively three grades of above-mentioned circuit are described in detail.
Fig. 4 is the circuit diagram of first order power purification circuit 11, and as shown in Figure 4, first order power purification circuit 11 is by isolating transformer and impedance stabilization the electric circuit constitute, wherein: isolation transforming circuit T1 carries out signal filtering first; Fuse U1 is for ensureing that electric current meets the requirements; Inductance (L1, L2), electric capacity (C1, C2) and resistance (R1, R2) form first order low-pass filtering and impedance stabilization loop, inductance (L3, L4), electric capacity (C3, C4) and resistance (R3, R4) form second level low-pass filtering and impedance stabilization loop, inductance (L5, L6), electric capacity (C5, C6) and resistance (R5, R6) form third level low-pass filtering and impedance stabilization loop.
Can realize the isolation of disturbing to external world by isolating transformer, can realize the purification of high-frequency noise and stablizing of channel impedance by the linear impedance stabilizing circuit.
Fig. 5 is the circuit diagram of second level power purification circuit 12, as shown in Figure 5, second level power purification circuit 12 is comprised of the low pass choke circuit, and wherein fuse U1 is for ensureing that electric current meets the requirements, inductance (L1, L2) and electric capacity (C1) form the low-pass filtering loop.
By second level power purification circuit 12, the clutter that the various servicing units in can the isolation test system and channel characteristics analog circuit produce and crosstalking.
Fig. 6 is the circuit diagram of third level isolation power supply circuits 13, and as shown in Figure 6, third level isolation power supply circuits 13 comprise: isolating transformer 131, calibration power source 132 and linear impedance stable module 133.Wherein, isolating transformer 131 is the signal from second level power purification circuit 12 for reception, and this signal is carried out to low-pass filtering, to filter high frequency clutter and noise; Calibration power source 132 is for isolating the carrier signal between concentrator carrier module interface card device and electric energy meter carrier module interface card device,, the electric power signal of input and output is isolated fully, guarantee the electrical characteristic isolation between concentrator carrier module interface card device and electric energy meter carrier module interface card device, and, due to the voltage circuit that only adopts calibration power source 132, circuit load will reduce; Linear impedance stable module 133 is used to electric energy meter carrier module interface card device that the second predetermined matched impedance is provided, 50 ohm of matched impedances that this second predetermined matched impedance is standard.
Isolate power supply circuits 13 by the third level and can realize the high-frequency signal isolation between concentrator carrier module interface card device and electric energy meter carrier module interface card device, make the carrier signal between electric energy meter carrier module and concentrator carrier module to crosstalk mutually by electric power loop, be merely able to the traffic channel by appointment.
(2) low-voltage network channel characteristics analogue means 2
As shown in Figure 2, low-voltage network channel characteristics analogue means 2 comprises:
The first high pass filter 21, for filtering from the power frequency electric power signal of second level power purification circuit output, to obtain the high frequency carrier signal of communication;
Noise injects unit 22, for the high frequency carrier signal of communication to the first high pass filter output, injects noise;
Transition-line analogy unit 23, carry out the transfer impedance simulation of power line for the signal that noise is injected to unit output;
Attenuation units 24, carry out loss decay simulation for the signal to the output of transition-line analogy unit;
The second high pass filter 25, the power frequency electric power signal (for example, the 220V power frequency component) of exporting for the signal by attenuation units output and third level isolation power supply circuits is superposeed, and after superposed signal, exports obtaining;
Multipath analogue unit 26, carry out the Multipath Transmission interference simulation for the superposed signal to the second high pass filter output;
Alternating current electronic load 27, carry out the load impedance simulation for the signal to the output of multipath analogue unit.
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 the first high pass filter 21 and the second high pass filter 25, and as shown in Figure 7, mutual inductor (T1) and electric capacity (C1, C2) form the high-pass filtering loop; Fuse (U1) meets the requirements for ensureing electric current; Voltage stabilizing didoe (D1, D2) is for providing overvoltage protection.Can filtering power frequency electric power signal by the first high pass filter (21), thus the carrier signal of extracting; By the second high pass filter (25) 220V power frequency electric power circuit that the high frequency carrier signal of communication of attenuation units output can be coupled back.
Fig. 8 is that noise injects unit 22(and also can be called set of digits accepted way of doing sth noise simulation unit) the concrete structure block diagram, as shown in Figure 8, this noise injection unit 22 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; The high frequency carrier signal of communication that carrier signal Acquisition Circuit 224 receives from the 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 caches chip 223 into, and obtain noise data from the caches chip, carry out numbers pile up with the carrier data by noise data and AD converter 225 outputs, thereby form aliasing, the blended data of noise signal and carrier signal is arranged, and blended data is exported to DA transducer 226; Then, discharge circuit 227 carries out the voltage amplification of signal by the data of DA transducer 226 outputs; Afterwards, power amplifier 228 carries out power amplification by the signal of discharge circuit 227 outputs, thereby completes the noise injection process.
Particularly, serial communication interface chip 221 is for obtaining noise file from centralized control computer 5; The noise file obtained will store into by the transmission path data channel of digital signal processing chip 222 in caches chip 223; When needs inject noise to carrier signal, 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 to numbers pile up, 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 the first high pass filter 21, and is injected in AD converter 225 and realizes the transformation of analog signal to digital signal; DA transducer 226 completes the transformation of digital signal to analog signal; The hybrid analog-digital simulation signal will be sent to the voltage amplification of carrying out signal in discharge circuit 227 afterwards; Last signal will be imported in power amplifier 228 and carry out power amplification; So far complete 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) means mixed output signal, and p (i) explains carrier data, and data length is N, and n (i) means the high speed noise data, and M means that the noise time delay counts, and A means the noise amplitude weights.
Inject unit 22 by noise and obtain the noise waveform file from centralized control computer 5, be translated into analog signal, finally be injected on the carrier communication channel, thereby complete the noise simulation process.Than separate apparatus formula noise simulation system of the prior art, the volume that the noise of the embodiment of the present invention injects unit is obviously less, and the noise type that can simulate is also more, and simple to operate, equipment manufacturing cost is low.
In specific implementation process, transition-line analogy unit 23 can be the RLC array, for realizing 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 formula, R (v), L (v), G (v), C (v) are respectively that resistance, inductance, the electricity of wire are led, electric capacity.The general name of the changing factor that v is impedance operator, be referred to as V-shaped non-uniform circuit equation.
Fig. 9 is the circuit diagram of RLC array, as shown in Figure 9, and resistance (R1, R2, R3, R7) for realizing the coarse adjustment to transmission line series impedance situation, by switch (J1, J2, J3, J4) to control, slip variable resistance (R5, R6) is for realizing the fine setting to the series impedance situation; Slide and become sense (L3, L4) for realizing the adjustment to transmission line series connection induction reactance; Slip variable resistance R4 is for realizing the fine setting to the parallel impedance situation; Slip transfiguration C2 is for realizing the fine setting to the transmission line capacitive reactance, and electric capacity (C3, C4) is for realizing the coarse adjustment to the transmission line capacitive reactance.
Above-mentioned attenuation units 24 can realize the simulation to the low-voltage power line loss, particularly, this attenuation units 24 can be comprised of Agilent8494G programmable attenuator, Agilent8496G programmable attenuator, Agilent11713C attenuator driver and the interconnected external member of Agilent11716 attenuator.
Figure 10 is the structured flowchart of multipath analogue unit 26, and as shown in figure 10, multipath analogue unit 26 comprises:
Path separation module 261, decompose many transmission paths for the carrier signal by the second high pass filter output;
Path simulation module 262, carry out delay operation and attenuation operations for the carrier signal by every transmission paths;
Path synthesis module 263, for the synthesis of the carrier signal of every transmission paths output.
Particularly, the simulation process of Multipath Transmission characteristic is: path separation module 261 decomposes input signal on n different transmission path, signal on 262 pairs of every transmission paths of path simulation module carries out time delay and attenuation processing, path synthesis module 263 synthesizes total output signal again by the signal of n paths output, so far, completed the simulation process of Multipath Transmission characteristic.
Above-mentioned alternating current electronic load 27 is for completing 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) feature in can the Reality simulation environment, general 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), consume the equipment of electric energy by the dissipation power of power tube.Alternating current electronic load can accurately detect load voltage, and the accurate adjustment load current can be realized the fictitious load short circuit, and the perception of fictitious load is resistive to be changed with capacitive, realizes the adjusting of capacitive load currents rise time simultaneously.
In specific implementation process, above-mentioned low-voltage network channel characteristics analogue means also comprises: high pass decoupling module and low pass transformer, high pass decoupling module is for extracting the carrier signal of described the second high pass filter output, the low pass transformer for example, for (being scheduled to power frequency component, the 220V power frequency component) be depressured to scheduled voltage, this predetermined voltage is set in advance by system.In the specific implementation, the output signal of high pass decoupling module, with after the output signal of low pass transformer is connected, is linked into alternating current electronic load 27, so that the impedance variation of different frequency point to be provided by alternating current electronic load 27.
Particularly, when adopting the AC system electronic load, when simulating the impedance variation of large numerical value, can directly it be incorporated to 220V power line loop; When the impedance variation of simulation fractional value, need to provide at least AC bias voltage of 10Vac for it, but very large bias voltage can not be provided, otherwise its impedance simulation scope can be affected.Therefore need to utilize the low pass transformer will input 220V voltage and carry out transformation and export to alternating current electronic load as AC bias voltage after for 11V, recycle high pass decoupling module, separately carrier signal be extracted, export to AC load, carry out the simulation of impedance.
Figure 11 is the connection diagram of alternating current electronic load 27, and as shown in figure 11,220V high pass decoupling module 28 is for the carrier signal on the power line that extracts the second high pass filter output; 20:1 low pass transformer 29 is for being depressured to 11V by the 220V power frequency component; 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, by the impedance variation of its simulation different frequency point.
As seen from the above description, the beneficial effect of the low-voltage network noise characteristic analogue means of the present embodiment is: (1) due to the on-the-spot noise playback technology adopted based on large capacity storage module, noise situations that can realistic simulation actual motion environment; (2) owing to utilizing the RLC array to realize the simulation to the power line transfer impedance, utilize the active electronic load device to realize the simulation to actual power load, make that dynamic range is large, analog spectrum characteristic changeability is strong; (3) due to the multipath and the decay analog circuit that adopt based on embedded path matrix calculation unit, realized the simulation to low-voltage network multipath fading and line loss decay characteristics, but make, simulaed path quantity is large, the path parameter changeability is strong.
(3) concentrator carrier module interface card device 3
Figure 12 is the structured flowchart of concentrator carrier module interface card device 3, as shown in figure 12, this concentrator carrier module interface card device 3 comprises: comprise concentrator carrier module socket 31, power frequency filter circuit 32, test instruction generating chip 33,485 serial communication chips 34 and 220V ac power circuit 35, wherein: concentrator carrier module socket 31 is connected the concentrator carrier communication module with circuit for physics; Power frequency filter circuit 32, for filtering 50Hz power frequency component, is transferred to test instruction generating chip 33 to extract carrier signal; Test instruction generating chip 33 generates test instruction for random, and sends this instruction to the concentrator carrier communication module; 485 serial communication chips 34 are the two-way communication with centralized control computer 5 for realization; 220V ac power circuit 35 is used to the circuit on concentrator carrier module interface card device 3 that electric power supply is provided.
(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, as 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 connected the concentrator carrier communication module with circuit for physics; Power frequency filter circuit 42, for filtering 50Hz power frequency component, is transferred to centralized control computer 5 to extract carrier signal; 485 serial communication chips 43 are the two-way communication with centralized control computer 5 for realization; 220V ac power circuit 44 is used to the circuit on electric energy meter carrier module interface card circuit 4 that electric power supply is provided.
(5) the centralized control computer 5
5 pairs of low-voltage network channel characteristics analogue means of centralized control computer carry out centralized operation, can realize automation and the Long-distance Control of channel simulation flow process, avoided manually-operated wrong hidden danger, reduced external interference, carried out the test job of channel simulation and carrier communication product after being convenient in shielded enclosure.
The test macro that the embodiment of the present invention provides the is integrated analog capability of exclusive complicated noise, impedance nonlinear change feature, network multi-path decay characteristics and loss of signal feature to low-voltage network, by this test macro, can complete the quantitative test of the indexs such as emitting performance, transmitting-receiving success rate, successful receiving 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 present invention is realized simply, is spent less and can accurately comprehensively simulate every essential characteristic of low-voltage powerline carrier communication channel.
In sum, the test macro that the embodiment of the present invention provides comprises following beneficial effect:
(1) system can the comprehensive simulated low-voltage network noise characteristic, transmission line impedance feature, load impedance feature, multipath fading feature and line loss feature, thus can full test low voltage electric power carrier communication equipment;
(2) by 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 that the good electrical of tested concentrator carrier module and electric energy meter carrier module is isolated;
(3) adopt low-voltage network channel characteristics analogue means, can realize the simulation to the online Complex Noise interference 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 forms, can realize the simulation to the power line 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 low-voltage network signal Multipath Transmission;
(7) introduce alternating current electronic load and complete the simulation to the low-voltage network load impedance characteristic, can accurately detect load voltage, the accurate adjustment load current, can realize the fictitious load short circuit simultaneously, the perception of fictitious load is resistive to be changed with capacitive, realizes the adjusting of capacitive load currents rise time;
(8) adopt the centralized control computer to carry out centralized operation to all analog circuits and device, can realize automation and the Long-distance Control of channel simulation flow process, avoided manually-operated wrong hidden danger, reduced external interference, carried out the test job of channel simulation and carrier communication product after being convenient in shielded enclosure;
(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 a control computer of an embedded circuit box, has obviously reduced system cost and probability of malfunction, is convenient to batch production and applies.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the test macro of a low voltage electric power carrier communication equipment, is characterized in that, described system comprises:
Power line cleaner, 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 line cleaner, be used to internal system that electric energy and matched impedance, isolation interference noise are provided and isolate described concentrator carrier module interface card device and described electric energy meter carrier module interface card device between carrier signal;
Described low-voltage network channel characteristics analogue means, be connected with described power line cleaner, comprised the simulation of the low-voltage network channel characteristics of noise characteristic, transfer impedance feature, loss decay characteristics, Multipath Transmission interference characteristic and load impedance feature for the signal to described power line cleaner output;
Described concentrator carrier module interface card device, be connected with low-voltage network channel characteristics analogue means with described power line cleaner, be used to the communication equipment be connected with described concentrator carrier module interface card device electric energy to be provided and communication connection is provided;
Described electric energy meter carrier module interface card device, be connected with low-voltage network channel characteristics analogue means with described power line cleaner, is used to the electric energy meter be connected with described electric energy meter carrier module interface card device electric energy to be provided and communication connection is provided;
Described centralized control computer, 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 connected, for described concentrator carrier module interface card device, communicating to test described communication equipment, with described electric energy meter carrier module interface card device, communicate the control of testing described electric energy meter and described low-voltage network channel characteristics analogue means being carried out to the simulation of low-voltage network channel characteristics;
Wherein, described power line cleaner comprises:
First order power purification circuit, be used to internal system that the interference noise of electric energy and the first predetermined matched impedance and isolating exterior power supply is provided;
Second level power purification circuit, for the clutter of isolating described internal system with crosstalk and provide electric energy for described concentrator carrier module interface card device;
Third level isolation power supply circuits, for isolating the carrier signal between described concentrator carrier module interface card device and described electric energy meter carrier module interface card device.
2. system according to claim 1, is characterized in that, described third level isolation power supply circuits comprise:
Isolating transformer, for receiving the signal from described second level power purification circuit, and carry out low-pass filtering to this signal, to filter high frequency clutter and noise;
The calibration power source, for isolating the carrier signal between described concentrator carrier module interface card device and described electric energy meter carrier module interface card device;
The linear impedance stable module, be used to described electric energy meter carrier module interface card device that the second predetermined matched impedance is provided.
3. system according to claim 2, is characterized in that, described low-voltage network channel characteristics analogue means comprises:
The first high pass filter, for filtering from the power frequency electric power signal of described second level power purification circuit output, to obtain the high frequency carrier signal of communication;
Noise injects unit, for the high frequency carrier signal of communication to described the first high pass filter output, injects noise;
The transition-line analogy unit, carry out the transfer impedance simulation of power line for the signal that described noise is injected to unit output;
Attenuation units, carry out loss decay simulation for the signal to the output of described transition-line analogy unit;
The second high pass filter, the power frequency electric power signal of exporting for the signal by the output of described attenuation units and described third level isolation power supply circuits is superposeed, and after superposed signal, exports obtaining;
The multipath analogue unit, carry out the Multipath Transmission interference simulation for the superposed signal to described the second high pass filter output;
Alternating current electronic load, carry out the load impedance simulation for the signal to described multipath analogue unit output.
4. system according to claim 3, is characterized in that, described noise injects 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, for obtaining noise file from described centralized control computer;
Described carrier signal Acquisition Circuit, for receiving the high frequency carrier signal of communication from described the first high pass filter, and export to described AD converter by described high frequency carrier signal of communication;
Described digital signal processing chip, for storing described noise file into described caches chip, and obtain noise data from described caches chip, carry out numbers pile up with the carrier data by described noise data and the output of described AD converter, thereby form aliasing, the blended data of noise signal and carrier signal is arranged, and described blended data is exported to described DA transducer;
Described discharge circuit, carry out the voltage amplification of signal for the data by described DA transducer output;
Described power amplifier, carry out power amplification for the signal by described discharge circuit output.
5. system according to claim 3, is characterized in that, described transition-line analogy unit is the RLC array.
6. system according to claim 3, is characterized in that, described multipath analogue unit comprises:
The path separation module, decompose many transmission paths for the carrier signal by described the second high pass filter output;
The path simulation module, carry out delay operation and attenuation operations for the carrier signal by every transmission paths;
The path synthesis module, for the synthesis of the carrier signal of every transmission paths output.
7. system according to claim 3, is characterized in that, described low-voltage network channel characteristics analogue means also comprises:
High pass decoupling module and low pass transformer, wherein:
Described high pass decoupling module is for extracting the carrier signal of described the second high pass filter output, and the low pass transformer is depressured to scheduled voltage for being scheduled to power frequency component; The output signal of high pass decoupling module, with after the output signal of low pass transformer is connected, is linked into described alternating current electronic load, so that the impedance variation of different frequency point to be provided by described alternating current electronic load.
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