CN203745634U - Three-phase electric power harmonic wave standard source - Google Patents

Three-phase electric power harmonic wave standard source Download PDF

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Publication number
CN203745634U
CN203745634U CN201320778690.4U CN201320778690U CN203745634U CN 203745634 U CN203745634 U CN 203745634U CN 201320778690 U CN201320778690 U CN 201320778690U CN 203745634 U CN203745634 U CN 203745634U
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China
Prior art keywords
phase
power amplifier
output terminal
input end
sampling module
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CN201320778690.4U
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Chinese (zh)
Inventor
葛荣刚
高世伟
刘兆领
郑悦
李聪利
赵宇营
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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Abstract

The utility model relates to a three-phase electric power harmonic wave standard source including a control module, a three-phase six-channel AC standard signal source generator, a multi-channel power amplifier, a sampling module, a measuring module and a vector sampling module. According to the utility model, digital waveform synthesis, digital frequency modulation, amplitude modulation, digital phase shift and large-scale integration and power amplification are adopted, such that the three-phase electric power harmonic wave standard source is high in power-output anti-interference capability, high in stability, high in accuracy and high in automation degree. Precision modulation of current, voltage and phase position can be realized. A plurality of common-use testing points are set and common-use point setting is completed in a single process. Amplitude and frequency of harmonic waves can be adjusted freely and phase position between the harmonic waves and the base waves can be changed quickly and continuously. The three-phase electric power harmonic wave standard source is an ideal device for calibrating and measuring electric energy amplitude value and monitoring electric energy quality.

Description

Three-phase power harmonic standard source
Technical field
The utility model belongs to electric power fortune inspection apparatus field, especially a kind of three-phase power harmonic standard source.
Background technology
Flourish along with Chinese national economy, electric load sharply strengthens, and the particularly continuous growth of impact and nonlinear-load capacity, makes the power quality problems such as electrical network generation wave form distortion, voltage fluctuation and flicker and three-phase imbalance.Power quality problem directly affects high sensitivity load, also affect energy-saving and emission-reduction, so the quality of power supply more and more comes into one's own, occurred much electricity quality monitoring device, but the development of calibrating installation about it relatively lags behind, and also there is no mature and stable special correcting device.
Current harmonic standard source both domestic and external for ensure output amplitude accurately, be all to convert output signal to direct current signal, by with machine in DC reference signal compare, control by difference, make amplitude output signal ensure certain accuracy.Aspect phase control, mostly adopt zero cross fired to carry out detected phase, then by calculating again the accuracy of control phase.
Existing control method is desirable in the amplitude control without harmonic wave, but in the signal of harmonic wave and phase control, there are two drawbacks having: the one, the zero cross fired counting of introducing when phase-detection can bring all multiple errors, affect the most at last the control accuracy of phase place: the 2nd, because phase control link is too much, the end value that needs repeatedly could determine several times output phase from this process of phase-detection → calculating → output control → phase equilibrium, this will reduce greatly measurement efficiency.In the time that three-phase standard source has multiple parameters will regulate control, if adopt above-mentioned principle will make system very complicated, and be difficult to realize.
Utility model content
The purpose of this utility model is to overcome above-mentioned weak point, and a kind of three-phase power harmonic standard source simple in structure, reasonable in design is provided.
The technical scheme that the utility model adopts is for achieving the above object:
A kind of three-phase power harmonic standard source, comprise control module, three-phase six tunnels exchange standard signal source generator, multiplex power amplifier, sampling module, measurement module and vector sampling module, described control module output terminal connects the input end of three-phase six tunnels interchange standard signal source generators, three-phase six tunnels exchange the input end of the output terminal connection multiplex power amplifier of standard signal source generator, the output terminal of multiplex power amplifier is for three-phase six road Voltage-outputs, at the output terminal of multiplex power amplifier respectively and be connected to sampling module and vector sampling module, sampling module input end is connected on multiplex power amplifier, sampling module output terminal connects the input end of measurement module, the input end of the output terminal link control module of measurement module, the input end of vector sampling module is connected on multiplex power amplifier, the input end of the output terminal link control module of vector sampling module, at the output terminal of multiplex power amplifier also and connect an agc circuit, described agc circuit connects a comparer, this comparer is serially connected in three-phase six tunnels and exchanges on the circuit of standard signal source generator and multiplex power amplifier, agc circuit is mainly got the amplitude proportion signal of output quantity, phase signal and part high frequency electrical signal composition, draw an error signal deliver to power amplifier front stage circuits go conditioning signal change.
And, described three-phase six tunnels exchange standard signal source generator and comprise low-pass filter, amplitude controller, and the interchange standard signal that described three-phase six tunnels interchange standard signal source generators are exported is transferred on multiplex power amplifier through low-pass filter, amplitude controller successively.
And, described multiplex power amplifier comprises power amplifier prime, power amplifier, the amplitude controller that three-phase six tunnels exchange in standard signal source generator passes through the input end that power amplifier prime connects power amplifier, power amplifier output terminal connects voltage follower circuit, power amplification circuit mainly completes and boosts or up-flow and power amplification, and this voltage follower circuit is three-phase six road voltage follower circuits.
And described amplitude controller is 16 high accuracy number potentiometers.
The beneficial effects of the utility model are:
1, the utility model adopts digital waveform synthetic, frequency-shift keying, amplitude modulation, digital phase shift and large-scale integrated power amplifier, and power supply output antijamming capability is strong; High stability; Pinpoint accuracy; High automation degree; Electric current, voltage and phase place fine adjustment, be provided with multiple common test points, commonly uses the one-time-reach-place that arranges of point; Harmonic amplitude number of times is adjustable arbitrarily, and the phase place between harmonic wave and first-harmonic can be carried out continuous fast moving; It is the ideal device that accurate calibration is measured electric energy amplitude and electric energy quality monitoring.
2, the utility model adopts the voltage of the compound FEEDBACK CONTROL band sampling of original creation, current power amplifier design, can change automatic power adjustment amplifying circuit according to output amplitude and phase place, not only can amplitude of samples to output signal, also sampling phase, output signal compares (amplitude, phase bit comparison) with the reference signal that exchanges in machine after vector sampling, controls the In-put design that carries out standard source by difference.
3, the utility model adds one-level low-pass filter to AC signal source before power amplification, thus the medium-high frequency undesired signal filtering higher than more than 3KHz, then filtered interchange reference signal is delivered to amplitude control circuit, amplitude control circuit is mainly made up of 16 high accuracy number potentiometers, completes thus the adjusting fineness of output electric weight.
4, the utility model is separate for acquisition mode and the circuit of phase place, amplitude data and the data comparison of output signal, interference while not only avoiding signal extraction separately, and improved the precision of signal extraction, avoid the error that after concentrated extraction signal, distributor circuit carries out amplitude and phase data comparison and measurement respectively again.
Brief description of the drawings
Fig. 1 is that the circuit in the utility model connects block diagram;
Fig. 2 is principle of work circuit block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and by specific embodiment, the utility model is described in further detail, and following examples are descriptive, are not determinate, can not limit protection domain of the present utility model with this.
A kind of three-phase power harmonic standard source, comprise control module, three-phase six tunnels exchange standard signal source generator, multiplex power amplifier, sampling module, measurement module and vector sampling module, described control module output terminal connects the input end of three-phase six tunnels interchange standard signal source generators, exchange the In-put design of standard signal source for controlling three-phase six tunnels, three-phase six tunnels exchange the input end of the output terminal connection multiplex power amplifier of standard signal source generator, the output terminal of multiplex power amplifier is for three-phase six road Voltage-outputs, at the output terminal of multiplex power amplifier respectively and be connected to sampling module and vector sampling module, sampling module input end is connected on multiplex power amplifier, sampling module output terminal connects the input end of measurement module, the input end of the output terminal link control module of measurement module, the input end of vector sampling module is connected on multiplex power amplifier, the input end of the output terminal link control module of vector sampling module.
At the output terminal of multiplex power amplifier also and connect an agc circuit, described agc circuit connects a comparer, this comparer is serially connected in three-phase six tunnels and exchanges on the circuit of standard signal source generator and multiplex power amplifier, agc circuit is mainly got the amplitude proportion signal of output quantity, phase signal and part high frequency electrical signal composition, draw an error signal deliver to power amplifier front stage circuits go conditioning signal change.
Above-mentioned three-phase six tunnels exchange standard signal source generator and comprise low-pass filter, amplitude controller, the interchange standard signal that described three-phase six tunnels interchange standard signal source generators are exported is transferred on multiplex power amplifier through low-pass filter, amplitude controller successively, because exchanging reference signal, part there is the high frequency signal that a part is useless, so by low-pass filter circuit higher than medium-high frequency undesired signal filtering more than 3KHz, amplitude controller regulation output electric weight fineness.
Above-mentioned multiplex power amplifier comprises power amplifier prime, power amplifier, the amplitude controller that three-phase six tunnels exchange in standard signal source generator passes through the input end that power amplifier prime connects power amplifier, power amplifier output terminal connects voltage follower circuit, power amplification circuit mainly completes and boosts or up-flow and power amplification, and this voltage follower circuit is three-phase six road voltage follower circuits.
AC signal after power amplification circuit amplifies is connected to voltage follower circuit output, also the electric signal of Voltage-output is delivered to sampling module simultaneously and carried out the collection of electric weight amplitude, and measure by measurement module, then information is fed back to control module, vector sampling module gathers the phase place of the electric signal of Voltage-output, then information is also fed back to control module, when realizing compound FEEDBACK CONTROL thus, Voltage-output is sampled.
Amplitude controller is 16 high accuracy number potentiometers.
In control module, be connected with display and keyboard, realize the mode of operation of man-machine interaction, display is for to sampling module and vector sampling module, electric weight amplitude and the electrical signal phase to Voltage-output carries out observation and analysis.
Although disclose for the purpose of illustration embodiment of the present utility model and accompanying drawing, but it will be appreciated by those skilled in the art that: not departing from the spirit and scope of the utility model and claims, various replacements, variation and amendment are all possible, therefore, scope of the present utility model is not limited to embodiment and the disclosed content of accompanying drawing.

Claims (4)

1. a three-phase power harmonic standard source, it is characterized in that: comprise control module, three-phase six tunnels exchange standard signal source generator, multiplex power amplifier, sampling module, measurement module and vector sampling module, described control module output terminal connects the input end of three-phase six tunnels interchange standard signal source generators, three-phase six tunnels exchange the input end of the output terminal connection multiplex power amplifier of standard signal source generator, the output terminal of multiplex power amplifier is for three-phase six road Voltage-outputs, at the output terminal of multiplex power amplifier respectively and be connected to sampling module and vector sampling module, sampling module input end is connected on multiplex power amplifier, sampling module output terminal connects the input end of measurement module, the input end of the output terminal link control module of measurement module, the input end of vector sampling module is connected on multiplex power amplifier, the input end of the output terminal link control module of vector sampling module, at the output terminal of multiplex power amplifier also and connect an agc circuit, described agc circuit connects a comparer, this comparer is serially connected in three-phase six tunnels and exchanges on the circuit of standard signal source generator and multiplex power amplifier, agc circuit is mainly got the amplitude proportion signal of output quantity, phase signal and part high frequency electrical signal composition, draw an error signal deliver to power amplifier front stage circuits go conditioning signal change.
2. three-phase power harmonic standard source according to claim 1, it is characterized in that: described three-phase six tunnels exchange standard signal source generator and comprise low-pass filter, amplitude controller, the interchange standard signal that described three-phase six tunnels interchange standard signal source generators are exported is transferred on multiplex power amplifier through low-pass filter, amplitude controller successively.
3. three-phase power harmonic standard source according to claim 2, it is characterized in that: described multiplex power amplifier comprises power amplifier prime, power amplifier, the amplitude controller that three-phase six tunnels exchange in standard signal source generator passes through the input end that power amplifier prime connects power amplifier, power amplifier output terminal connects voltage follower circuit, power amplification circuit mainly completes and boosts or up-flow and power amplification, and this voltage follower circuit is three-phase six road voltage follower circuits.
4. three-phase power harmonic standard source according to claim 2, is characterized in that: described amplitude controller is 16 high accuracy number potentiometers.
CN201320778690.4U 2013-12-02 2013-12-02 Three-phase electric power harmonic wave standard source Active CN203745634U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320778690.4U CN203745634U (en) 2013-12-02 2013-12-02 Three-phase electric power harmonic wave standard source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320778690.4U CN203745634U (en) 2013-12-02 2013-12-02 Three-phase electric power harmonic wave standard source

Publications (1)

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CN203745634U true CN203745634U (en) 2014-07-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218580A (en) * 2014-09-23 2014-12-17 张慧慧 Distributed smart power grid adjustment device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218580A (en) * 2014-09-23 2014-12-17 张慧慧 Distributed smart power grid adjustment device

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