CN104122477A - Device and method for testing dynamic reactive power compensation device based on virtual instrument technology - Google Patents
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Abstract
The invention relates to a device for testing a dynamic reactive power compensation device based on a virtual instrument technology. The device comprises a signal processing unit, a data acquiring unit and a display unit, wherein the signal processing unit is used for bucking, filtering, blocking and amplifying acquired signals and sending the processed signals to the data acquiring unit, the data acquiring unit is used for acquiring signals output by the dynamic reactive power compensation device according to the processed signals from the signal processing unit, and the display unit is used for receiving and analyzing the signals from the data acquiring unit and displaying the analyzed signals in a wave form. The device has the advantages that real-time automatic monitoring of power grid signals and tracking of power grid operation conditions can be achieved.
Description
Technical field
The present invention relates to instrument control field, particularly relate to dynamic reactive compensation device proving installation and method based on virtual instrument technique.
Background technology
At present, reactive power compensator is carried out to performance test and effect assessment still lacks specialization, specialized testing tool, the effect of reactive power compensator being improved to the quality of power supply still lacks direct test and analysis tool.Substantially be to adopt relevant electric test instrument to gather various related datas, then analyze, process is numerous and diverse and indirect.The also difficulty and not enough comparatively that causes that relevant test job carries out.Therefore, need a kind of new reactive power compensator proving installation.
Summary of the invention
For above the deficiencies in the prior art, the invention provides a kind of dynamic reactive compensation device proving installation and method based on virtual instrument technique.
Object of the present invention is achieved through the following technical solutions:
Dynamic reactive compensation device proving installation based on virtual instrument technique, this proving installation comprises:
Signal processing unit, for the signal that will gather being comprised to step-down, filtering, every processing straight and that amplify, and gives data acquisition unit by signal after treatment;
Data acquisition unit, according to the processing signals from described signal processing unit, gathers the signal of dynamic reactive compensation device output;
Display unit, receives the signal from described data acquisition unit, analyzes this signal, and analytic signal is carried out to waveform demonstration.
Further, described signal processing unit comprises:
Mutual inductor configuration circuit, for exporting low-voltage signal to data acquisition unit;
Signal conditioning circuit, for carrying out step-down, filtering, processing every straight and amplification to voltage/current signals.
Further, described signal conditioning circuit comprises:
Voltage signal filter circuit, for carrying out filtering processing to the signal of input data acquisition unit;
Block isolating circuit, the processing of removing DC offset for the signal to described mutual inductor configuration circuit;
Amplifying circuit, for amplifying processing to the signal of described block isolating circuit output.
Further, described data acquisition unit comprises:
Grid power on-line testing unit, according to the voltage and current signal gathering, obtains the active power output of collection signal;
Voltage fluctuation monitoring means, for the real-time synchronization on-line monitoring of the three-phase voltage to collection signal and current waveform;
Mains by harmonics monitoring and analytical calculation module, analyze for the harmonic wave to collection signal.
Dynamic reactive compensation device method of testing based on virtual instrument technique, this method of testing comprises the steps:
1) access power network signal, the three-phase voltage of collection signal and electric current;
2), according to the voltage and current signal gathering, active power, reactive power, power factor and the make-up time of surveying signal monitor;
3) according to monitor signal, signal data is analyzed, obtain voltage pattern, map of current and the power diagram of signal;
4) building database, stores above-mentioned collection signal, and to storage data formation test report.
The invention has the advantages that:
The present invention is the monitoring of long-range, real-time, the all-weather of a kind of reactive power compensator, reactive-load compensation process.Object is:
(1) for ensureing power system reactive power balance, the reactive power compensator that is installed on electrical network common node is carried out to on-line testing and analysis, the response speed of evaluating apparatus and reactive-load compensation ability, thus for configuring with type selecting, dynamic passive compensation equipment provides effective Data support and technical support.
(2) dynamically follow the tracks of grid voltage change situation, the impact of the compensation effect of analysis dynamic passive compensation equipment on voltage stability.Key is fluctuation and quick, effective recovery situation of voltage before and after compensation, the role and influence of checking reactive power compensator to power network safety operation situation.
(3) set up the database of typical test cases observation data, for reviewing with analysis of historical data provides foundation.
Brief description of the drawings
Fig. 1: reactive power compensator test wiring diagram;
Fig. 2: dynamic reactive compensation device test system structure figure;
Fig. 3: voltage signal filtering circuit;
Fig. 4: current signal filtering circuit;
Fig. 5: amplifying circuit;
Fig. 6: signals collecting subprogram block diagram;
Fig. 7: dynamic response timing program block diagram;
Fig. 8: reactive power is calculated flow chart;
Fig. 9: dynamic reactive compensation device characteristic test and evaluation FB(flow block).
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with drawings and Examples:
It is design proposal that the present invention adopts virtual instrument technique, a kind of reactive-load compensation of specialization and the testing tool of correlation parameter thereof are provided, solve the series of tests problem in reactive power compensation technology field, comprise grid power on-line monitoring, reactive-load compensation process and reactive power compensator characteristic monitoring and evaluation, the affect tracking and testing of dynamic passive compensation on voltage stability, operating condition track record etc.
As shown in Figure 1, the wiring of whole test macro formation is made up of electrical network bus, dynamic reactive compensation device, reactive power compensator tester three parts.Electrical network bus provides three-phase voltage/current signal to main control cabinet, gathers low-pressure side three-phase voltage/current signal from reactive power compensator main control cabinet terminal, sends into reactive power compensator tester.
The multilayer control structure that reactive power compensator tester of the present invention is made up of hardware and software, comprises hardware device level, and I/O drives layer, application software layer.
As shown in Figure 2, reactive power compensator tester hardware comprises PT/CT(voltage/current mutual inductor), signal conditioning circuit, high-accuracy data collection card and computing machine form.Hardware is responsible for signal acquisition, data acquisition.Carry out communication by data collecting card and data line, control capture card access signal is carried out to the collection of hyperchannel real-time synchronization.
I/O drives layer to drive by instrument drivers DLL and PCI control card.
Application software layer is responsible for data processing and test result shows, adopt graphical programming language LabVIEW to write, comprise grid power monitoring modular, dynamic reactive compensation device characteristic test and evaluation module, comprise this area and tested needed information, realized series of tests and analytic function.
Test job flow process, system is carried out parameters initialization at collection port, in PC software, sample frequency is set, and loads DAQmx task.Signal message is delivered to PC by six passage capture cards.The waveform and the chart that complete collection signal by software show and calculation of parameter, and data are deposited.Sampling rate is decided to be 2000Hz, and mode is continuous sampling, and sampling number is 2000, and maximum input voltage amplitude is 10V.
Mutual inductor configuration circuit
Select closed loop Hall current mutual inductor CHB-25NP and closed loop Hall voltage mutual inductor CHV-50P/*A.Mutual inductor has magnetic compensation function and shorter reaction time, wider frequency range, realizes well buffer action, facilitates mutual inductor outgoing side low-voltage signal directly to process and send data collecting card.
Signal conditioning circuit
Signal conditioning circuit carries out step-down, filtering, processes every straight and amplification voltage/current signals, reaches data acquisition system (DAS) and allows in voltage range, and six road signals are delivered to data acquisition card by connector after conditioning.Signal conditioning circuit comprises modulate circuit power supply, voltage signal wave filter, current signal filter, block isolating circuit, amplifying circuit.
The operating voltage of hardware modulate circuit is positive and negative 12V, uses the adjustable voltage stabilizer LM317 of three ends and LM337, realizes the design of working power, by changing the adjustable resistance resistance of voltage stabilizer access, realizes the variation of controlling output dc voltage.In circuit, comprise protection part,, at two ends voltage stabilizer access diode, prevented circuit reverse-conducting, burnt circuit.For ensureing the voltage stabilizer less ripple of output as far as possible, at circuit output end electrochemical capacitor in parallel, circuit front-end is three-phase transformer, and circuit output end can provide adjustable DC voltage within the scope of 0 ~ ± 15V.
Voltage signal filter circuit
As shown in Figure 3-4, because the amplitude of voltage signal is 3V ~ 4V left and right, and the range of the data collecting card using is in 10V, according to the experiment prerequisite of accurate test, should ensure that the signal voltage that capture card gathers is large as far as possible in allowed band.In passband, to obtain the comparatively requirement of flat frequency response characteristic in order meeting, to adopt simple second order voltage controlled voltage source type Butterworth LPF.Second order voltage controlled voltage source low-pass filter circuit is made up of two RC links and in-phase proportion amplifying circuit.
Block isolating circuit
In actual electrical network output signal, generally can there is certain flip-flop, therefore in signal conditioning circuit, should comprise removing DC road.
Due to the principle of work of current transformer self, output end signal not only comprises AC signal, has also comprised the approaching direct current signal of part amplitude and AC signal amplitude.Owing to having mixed direct current signal in signal, cause the directly current signal generation skew largely of output of output terminal, and be not only AC signal in original input signal, therefore need to select the circuit of an advantages of simple, removal DC offset that applicability is strong, this circuit does not change the phase place of AC signal in removing DC offset, retains to greatest extent raw information.
Signal is through active low-pass filter filtering AC signal, and remaining direct current signal, re-uses subtracter original signal is deducted to direct current signal, reaches the object of removing DC offset.Single order active filter is to be made up of a single order passive low ventilating filter and a voltage follower.Consider that original signal fundamental frequency is 50Hz, reduce the upper limiting frequency of single order passive low ventilating filter as far as possible, could in the process of doing subtraction, ensure to prevent distortion by the complete of 50Hz power frequency component, choose here
, C1=10uf, as calculated, the upper limiting frequency of single order passive low ventilating filter, operational amplifier is selected OP07.Direct current offset goes
Input and output AC signal waveform overlaps completely, and skew does not occur the phase place of AC signal and amplitude does not also change, and produces a desired effect.
Amplifying circuit
As shown in Figure 5, smaller through the ac current signal after block isolating circuit, need to be amplified, so that input PXI is for data acquisition.Amplifying circuit is selected two two computing integrated amplifier LF353 chips, connects by two-stage cascade mode, first order output is directly accessed to the second level and input, and realizes 30 ~ 86.7 enlargement factors adjustable.
Data collecting card
Data acquisition is the system core, select PXIe-4472 data collecting card, as shown in Fig. 6-7, parameter index is 8 road synchronized sampling analog input channels, 24 A/D conversion resolutions, the transmission of PXI bus mode, input reference signal ± 10V, each passage is 250 Ks/s sampling rates, each channel spacing from, each passage has programmable-gain and low-pass filtering option, realizes many device trigger and synchronous by PXI Express, uses NI-DAQmx drive software to realize main control computer communication.
Because the input of collection terminal is three-phase voltage current signal, therefore amount at least 6 can carry out the passage of collecting work simultaneously, therefore choose be 28 passage NI companies produce PXIe-4472 data collecting cards, complete 12 channel data synchronous acquisitions.PXIe-4472 data collecting card has the analog input channel of 8 road synchronized samplings, and the highest sampling rate reaches 250Ks/s, has 24 bit resolutions.By DAQ assistant, sampling rate is decided to be to 2000Hz, mode is continuous sampling, and sampling number is 2000, and maximum input voltage amplitude is 10V.
Data acquisition program
Monitoring system software initial part is capture card collecting part, and the information collecting is as the output information of rear section software processing.For LabVIEW, can use two class moulds to enter the information that function collects capture card and import in PC, be respectively traditional NI-DAQ and redaction NI-DAQmx.That adopt is NI-DAQmx, compares the former, and the advantage of redaction NI-DAQmx is to have increased the DAQ assistant of passage is set and has expanded the measurement task that uses equipment in LabVIEW.In program, add DAQ assistant, capture card is sent into the data that collect in program software and is processed by DAQ assistant, obtain the two-dimensional array of one 6 row, use Index array function in order 0,1,2,3,4,5 row to be carried out to all row extractions to array, the data of taking out are the data that the each passage of capture card gathers, by 6 one-dimension array of they compositions.
In the time need to utilizing LabVIEW process analysis to process the signal of the outside input of PC, select and in plate, there will be DAQ helper module at function.In program, first arrange and select DAQmx task name, can set up voltage acquisition task by DAQ assistant, select this task to complete reading in of data.
After DAQ reads out data acquisition, these data are exactly real-time voltage/current signal.This array is again by the array of indexes module in LabVIEW, by voltage and current signal separately.So far, the voltage and current signal in electrical network is like this collected and be input in LabVIEW program, then just can carry out data processing,
Grid power on-line testing
(1) active power is calculated module
Obtaining, after each phase voltage/current signal of electrical network, writing the calculation procedure of active power.Its input variable is the effective value of voltage/current, and it changes with the change of the voltage/current signals gathering.Adopted two for loop structures, after voltage and current value counts in circulation, it is exactly active power output that the output obtaining after certain computing is gone after absolute value.
(2) reactive power is calculated module
As shown in Figure 8, having obtained after the amplitude of electric current and voltage, according to the calculating formula S=UI of applied power, can obtain electrical network applied power; Then the calculating formula of reactive power is
, the reactive power of the electrical network of therefore getting back; Know after active-power P and applied power S, according to the calculating formula of power factor
, we can obtain power angle
size; Further according to the calculating formula of reactive current
obtain the size of reactive current.
Dynamic reactive compensation device characteristic test and evaluation module
As shown in Figure 9, the total reactive power figure of three-phase is obtained total to the time interval, initial time and three-phase reactive power binding by bunch binding function, intuitively reflects power system reactive power situation of change.The total reactive power of three-phase is carried out standardization, by perunit value and standard value comparison, thinks when perunit value is lower than lower limit standard value that electric field is in reactive requirement state, when perunit value during higher than the upper limit standard value electric field meet state in idle.Use two choice structures, first structure decides and needs comparative standard value (upper limit/lower limit standard value) with beginning timing button; Whether second structures shape electric network reactive-load state, start to compensate timing.Start timing button and synchronize with reactive-load compensation equipment main control cabinet, in the time that main control cabinet sends step signal, think that starting timing button presses.
When perunit value is lower than lower limit standard value and start timing button while pressing, reactive-load compensation equipment starts to carry out reactive-load compensation, and millisecond counter starts timing, and calculating total idle increases of three-phase is partly compensating power; When perunit value is during higher than upper limit standard value, think that this moment reactive-load compensation equipment reactive-load compensation finishes, final millisecond counter numerical value is shown in timing by way of compensation.Judgement compensation timing, in the time that compensation timing is greater than 30ms, thinks and exceedes national regulation, boolean's control alarm lamp is lighted.Compensation timing is the required dynamic reactive compensation device dynamic response time of test.
Voltage fluctuation monitoring modular
After DAQ reads out data acquisition, export the array data of one 6 dimension, be real-time voltage current signal.By the array of indexes module in LabVIEW, by voltage and current signal separately, what 0-2 correspondence was exported is A, B, C three-phase voltage signal, and what 3-5 correspondence was exported is A, B, C three-phase current signal.Gathered three-phase voltage/current signal is carried out to two parts processing, and Part I, by waveform establishment, amplitude and level measurement function, obtains corresponding amplitude and effective value; Part II carries out twice for circulation, gets N secondary data and the method divided by N, obtains corresponding mean value, by mean value and standard value compound operation, obtains voltage deviation.Taking A mutually as example, can be in the hope of effective value U, I and the mean value of A phase by two parts, can calculate other series of experiments such as active-power P, applied power S, reactive power Q and powerfactorcosφ by programming needs electrical network parameter.
Because the sampling period is known, people is for being set to for 0 moment for sampling initial time, and capture card can be sent into three-phase voltage/electric current Real-time Collection for PC, applies the function carrying in these conditions and LabVIEW, carries out the demonstration of three-phase waveform signal.In program, utilize Build waveform function to produce signal waveform bunch, rear welding wave figure table function, shows corresponding waveform, realizes the recovery of signal waveform.Finally utilize extraction single-frequency information function, amplitude and electrical level function that LabVIEW carries to show frequency, amplitude and the phase place of the number of accepting and believing.This module has realized the real-time synchronization on-line monitoring of three-phase voltage, current waveform.
According to the definition of voltage fluctuation, in monitored waveform signal, sample, by finding the poor of maximum voltage amplitude and minimum voltage amplitude, calculate voltage fluctuation rate.
Mains by harmonics monitoring and analytical calculation module
(1) three-phase first-harmonic parameter module
Because power-frequency voltage is 50Hz, leach first-harmonic from voltage the inside, need by a bandpass filter, bandwidth 10 ~ 90Hz is set, leach the first-harmonic that frequency is 50Hz.Ripple analysis caught on a filter is drawn to parameters with wave form analysis software.
(2) Harmonics Calculation module
Propose a kind of improvement algorithm based on fft algorithm, be called FAFT algorithm, can the in the situation that of filtered signal high fdrequency component not, calculate the harmonic component higher than N/2 time (N is one-period sampling number) by analysis meter.In LabVIEW Software for Design, can first calculate, corresponding coefficient can be by the Formula Node calculating of programming; Simultaneously for obtaining complex frequency spectrum, need to point odd and even sample sequence is carried out to Fourier conversion, odd sequence is multiplied by corresponding with it coefficient, then does poorly, finally calculate the voltage harmonic degree of distortion.
The present invention is a kind of dynamic reactive compensation device tester, can be achieved as follows function, as shown in the table.
1. grid power on-line monitoring
Active current, reactive current, active power, reactive power, power are because of, voltage fluctuation etc.
2. reactive-load compensation process and reactive power compensator characteristic monitoring and evaluation
The mensuration of dynamic response time and reactive-load compensation speed;
(1) device range of adjustment test, comprises over-compensation, under-compensation warning;
(2) harmonic content, harmonic inhibition capability and measure of merit.
3. the affect tracking and testing of dynamic passive compensation on voltage stability.
4. operating condition track record, sets up the database of typical test cases observation data, for reviewing with analysis of historical data provides foundation.
The characteristic test of table 1 dynamic reactive compensation device and Function of Evaluation table
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of instructions of the present invention, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. the dynamic reactive compensation device proving installation based on virtual instrument technique, is characterized in that, this proving installation comprises:
Signal processing unit, for the signal that will gather being comprised to step-down, filtering, every processing straight and that amplify, and gives data acquisition unit by signal after treatment;
Data acquisition unit, according to the processing signals from described signal processing unit, gathers the signal of dynamic reactive compensation device output;
Display unit, receives the signal from described data acquisition unit, analyzes this signal, and analytic signal is carried out to waveform demonstration.
2. the dynamic reactive compensation device proving installation based on virtual instrument technique according to claim 1, is characterized in that, described signal processing unit comprises:
Mutual inductor configuration circuit, for exporting low-voltage signal to data acquisition unit;
Signal conditioning circuit, for carrying out step-down, filtering, processing every straight and amplification to voltage/current signals.
3. the dynamic reactive compensation device proving installation based on virtual instrument technique according to claim 2, is characterized in that, described signal conditioning circuit comprises:
Voltage signal filter circuit, for carrying out filtering processing to the signal of input data acquisition unit;
Block isolating circuit, the processing of removing DC offset for the signal to described mutual inductor configuration circuit;
Amplifying circuit, for amplifying processing to the signal of described block isolating circuit output.
4. the dynamic reactive compensation device proving installation based on virtual instrument technique according to claim 1, is characterized in that, described data acquisition unit comprises:
Grid power on-line testing unit, according to the voltage and current signal gathering, obtains the active power output of collection signal;
Voltage fluctuation monitoring means, for the real-time synchronization on-line monitoring of the three-phase voltage to collection signal and current waveform;
Mains by harmonics monitoring and analytical calculation module, analyze for the harmonic wave to collection signal.
5. the dynamic reactive compensation device method of testing based on virtual instrument technique, is characterized in that, this method of testing comprises the steps:
1) access power network signal, the three-phase voltage of collection signal and electric current;
2), according to the voltage and current signal gathering, active power, reactive power, power factor and the make-up time of surveying signal monitor;
3) according to monitor signal, signal data is analyzed, obtain voltage pattern, map of current and the power diagram of signal;
4) building database, stores above-mentioned collection signal, and to storage data formation test report.
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