CN104034981A - Self-circulation aging test system and test method for frequency converter - Google Patents
Self-circulation aging test system and test method for frequency converter Download PDFInfo
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Abstract
The invention discloses a self-circulation aging test system and a test method for a frequency converter. The method comprises the following steps: constructing a test environment by an alternating-current power grid, a boosting transformer, a tested frequency converter, a grid-connected reactor and a grid-connected switch; controlling the alternating-current output end of the tested frequency converter to actively output a detection pulse train before grid-connected running through a grid-connected control module embedded into a tested frequency converter control circuit; identifying the phase sequence and phase of the current network voltage by detecting response current flowing through the grid-connected reactor; performing network voltage tracking and current vector control grid-connected output; feeding grid-connected output electric energy back to the rectification input end of the tested frequency converter through the boosting transformer; controlling the grid-connected output current amplitude to realize self-circulation full-power aging test of the frequency converter. By adopting the self-circulation aging test system and the test method, self-circulation full-power aging test of the frequency converter is realized under the hardware configuration condition of a general frequency converter product. The self-circulation aging test system and the test method have the advantages of easiness in configuration, convenience in operation, real simulation condition, energy saving and high aging efficiency.
Description
Technical field
The present invention relates to frequency converter burn-in test technology, relate in particular to a kind of frequency converter self-loopa burn-in test technology.
Background technology
Total power burn-in test is a very important ring in reliability testing before frequency converter dispatches from the factory, and for energy-conservation consideration, adopts at present more total power aging circuit to be mainly divided into following a few class:
The Chinese invention patent of application number CN200710123594.5 provided a class straight-hand over the resistance imaginary loading burn in test circuit of inverter, realize controlled energy circulation by the reactive power in control bus electric capacity and imaginary loading reciprocal, but because output major part is reactive power, input rectifying bridge to frequency converter cannot provide total power aging condition, and still have larger ohmic load active loss, efficiency is lower.
The Chinese invention patent of application number CN201220260394.0 has provided a class motor-generator structure burn in test circuit, the electric energy of tested frequency converter output can be fed back to electrical network by the mode part of electric energy-mechanical energy-electric energy, advantage is that load used is actual loading, and test condition is true; Shortcoming is that intermediate link is more, system architecture complexity, and mechanical system and electric energy change send device loss larger, and system effectiveness is not high.
The Chinese invention patent of application number CN201210407764.3 has provided a class high voltage converter by the burn in test circuit of the grid-connected feedback of grid-connected reactor, there is higher system effectiveness, but need additional sample circuit and control module, output current control algolithm is too complicated, and does not control rectification-inversion system energy circulation and flow and cannot be used for input side and do not control the frequency converter of rectification because realizing.
The Chinese invention patent of application number CN201310325114.9 has provided a class current transformer or frequency converter self-loopa total power burn in test circuit, provide busbar voltage working point and active loss to supplement by direct current network, circulated to input end by output terminal by step-up transformer control energy, the embedded burn-in test module of tested transducer control circuit, without additional hardware sample circuit, test system structure is relatively simple, and efficiency is higher; But only can export modulation ratio regulation output current amplitude size by control, in actual use, need repeatedly to debug until output current amplitude meets test condition, time and effort consuming; And do not control the frequency converter of rectification for input side, its output current wave is not sinusoidal quantity, but do not control the input pulsating current of rectification, can not well simulate actual working load operating mode.
Summary of the invention
For in above-mentioned existing main energy-saving type frequency conversion device burn in test circuit, exist or configuration is complicated or operation inconvenience or efficiency is lower or the false defect of simulated conditions, one of object of the present invention is to provide a kind of configuration simple, easy to operate, simulated conditions are true, the frequency converter self-loopa aging testing system of aging efficient energy-saving.
Two of object of the present invention is to provide a kind of frequency converter self-loopa ageing testing method based on above-mentioned aging testing system.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of frequency converter self-loopa aging testing system, described aging testing system comprises: an AC network, a step-up transformer, a tested frequency converter, a grid-connected reactor;
Described aging testing system also comprises a grid-connected switch and is arranged on the grid-connected control module in tested transducer control circuit, described step-up transformer, grid-connected reactor and grid-connected switch are interconnected to form peripheral test circuit, the tested frequency converter that is provided with grid-connected control module is connected to AC network by this peripheral test circuit, and forms self-loopa burn-in test loop by grid-connected control module control.
In the preferred version of this test macro, in described aging testing system, AC network is connected to the rectification input end of tested frequency converter via step-up transformer, and the ac output end of tested frequency converter is connected to AC network via grid-connected reactor and grid-connected switch successively.
In another preferred version of this test macro, in described aging testing system, AC network is connected directly to the rectification input end of tested frequency converter, and the ac output end of tested frequency converter is connected to AC network via grid-connected reactor, step-up transformer and grid-connected switch successively.
Preferably, described step-up transformer is isolation boosting transformer or self coupling step-up transformer.
Preferably, the input of described tested frequency converter, output the number of phases identical.
Preferably, described grid-connected reactor is the filter reactor of L or LC or LCL structure.
Preferably, described grid-connected switch grid-connected switch closure after having powered at frequency converter.
Further, the closure of described grid-connected switch, by operating personnel's manual closing after frequency converter has powered on, completes defensive position dynamic circuit breaker in test and opens.
Further, described grid-connected switch is by inputting electrical network via timing relay control closure.
Further, described grid-connected switch is controlled closure automatically by frequency converter output relay node.
Based on above-mentioned test macro, the invention provides a kind of frequency converter self-loopa ageing testing method, in the method, first control tested frequency converter ac output end active output detections pulse train before being incorporated into the power networks by grid-connected control module, the current-responsive that flows through grid-connected reactor by detection is identified current line voltage phase sequence and phase place;
Then, then carry out line voltage tracking and carry out the grid-connected output of Current Vector Control, grid-connected output electric energy is fed back to the rectification input end of tested frequency converter by step-up transformer, and the self-loopa that realizes energy is flowed;
Finally, realize frequency converter self-loopa total power burn-in test by controlling grid-connected output current amplitude.
In the preferred version of method of testing, before described tested frequency converter is incorporated into the power networks, initiatively the detection pulse train of output is the detection pulse that is less than the electrical network cycle at least two time intervals.
Further, for the tested frequency converter of single-phase input, its detection pulse of initiatively exporting before being incorporated into the power networks is output no-voltage.
Further, the tested frequency converter of inputting for three-phase, its detection pulse of initiatively exporting before being incorporated into the power networks is bridge conducting simultaneously or the conducting simultaneously of lower bridge or two kinds of each lasting equal times of conducting state on three phase inverter bridge.
Further, in described method, be first proportional to line voltage based on current-responsive, calculate current electrical network phase place, then obtain the phase sequence of current electrical network according to the change direction judgement that detects pulse train detected phase.
Further, described grid-connected control module is used electric network model reference adaptive observer to carry out line voltage tracking, and this observer is realized the grid-connected control of frequency converter Converter Without Voltage Sensor together with Current Vector Control device.
Frequency converter self-loopa total power burn-in test scheme provided by the invention, configuration is simple in the specific implementation, only needs outer join step-up transformer, grid-connected reactor and grid-connected switch; Automatically complete grid-connected self-loopa ageing process by the embedded grid-connected control module of tested frequency converter, without external control, easy to operate; Tested frequency converter output current is sinusoidal current, and input current is actual grid-connected commutated current, and simulated conditions are true; Self-loopa total power is grid-connected aging, and electrical network only provides reactive-load compensation and system loss, efficient energy-saving.
Brief description of the drawings
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 a is that the embodiment of the present invention 1 test macro forms schematic diagram;
Fig. 1 b is that the embodiment of the present invention 2 test macros form schematic diagram;
Fig. 2 is embodiment of the present invention ageing system control flow chart;
Fig. 3 is the grid-connected control principle drawing of the embodiment of the present invention.
Main description of reference numerals:
1-step-up transformer;
2-tested frequency converter;
3-grid-connected reactor;
4-grid-connected switch;
L
s-grid-connected inductance value;
E
g-line voltage amplitude;
-electrical network angular frequency estimated value;
-electrical network phase estimation value.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Example 1
Referring to Fig. 1 a, it is depicted as the test macro for frequency converter self-loopa burn-in test in this example.As seen from the figure, this test macro is mainly by an AC network, and the grid-connected switch 4 of the grid-connected reactor 3, of the tested frequency converter 2, of a step-up transformer 1, connects and composes.
In this system, the rectification input end of tested frequency converter 2 is connected to AC network by step-up transformer 1, and ac output end is connected to AC network by grid-connected reactor 3 and grid-connected switch 4 successively, forms thus corresponding test environment.
In this example, AC network is three-phase alternating current electrical network, is specially 380V/50Hz civil power.
Step-up transformer 1 is isolation boosting transformer or self coupling step-up transformer, specifically adopts 1:1.15 isolation boosting transformer.
Grid-connected reactor 3 is the filter reactor of L or LC or LCL structure, specifically adopts three pole reactor type filter reactor.
Grid-connected switch 4 uses air-break; before system powers in off-state; avoid the ac output end via tested frequency converter in power up to charge to tested frequency converter; the grid-connected switch of rear manual closing that powered on can carry out over current trip protection in the time of self circular loop current anomaly.
For the closure of grid-connected switch 4, also can be by inputting electrical network via timing relay control closure or automatically controlling closure by frequency converter output relay node.
Input, the output number of phases of tested frequency converter 2 are identical, can be single-phase or three phase converter.In this example, be three phase converter, three-phase alternating current input, three-phase alternating current output.This frequency converter mainly comprises three-phase commutation bridge, three phase inverter bridge, control circuit and manipulater, and three-phase commutation bridge forms the rectification input end of frequency converter, and its input rectifying mode is that diode is not controlled rectification; Three phase inverter bridge connects three-phase commutation bridge, forms the ac output end of frequency converter; Control circuit is the control center of frequency converter, control linkage three phase inverter bridge; And the external operating unit that manipulater is frequency converter, it connects control circuit.
In this test macro, also embedded grid-connected control module in the control circuit of tested frequency converter 2, completes grid-connected self-loopa ageing process automatically by this grid-connected control module control, without external control, easy to operate.
The test environment that grid-connected control module control is made up of AC network, step-up transformer 1, tested frequency converter 2, grid-connected reactor 3 and grid-connected switch 4 forms self-loopa burn-in test loop, carry out self-loopa total power grid-connected aging, wherein electrical network only provides reactive-load compensation and system loss, efficient energy-saving.
The aging testing system that this example provides can carry out total power burn-in test, and aging more powerful under identical output current condition, test condition is more harsh.
Example 2
Referring to Fig. 1 b, the test macro for frequency converter self-loopa burn-in test in this example shown in it.As seen from the figure, this test macro is equally main by an AC network with the test macro in example 1, and the grid-connected switch 4 of the grid-connected reactor 3, of the tested frequency converter 2, of a step-up transformer 1, connects and composes.
In native system, the rectification input end of tested frequency converter 2 is directly connected to AC network, and ac output end is connected to AC network by grid-connected reactor 3, step-up transformer 1 and grid-connected switch 4 successively, forms thus corresponding test environment.
In addition, all the other are all identical with scheme in example 1, are not repeated herein.
In this example, the test environment that grid-connected control module control is made up of AC network, step-up transformer 1, tested frequency converter 2, grid-connected reactor 3 and grid-connected switch 4 forms self-loopa burn-in test loop, making tested frequency converter output current is sinusoidal current, input current is actual grid-connected commutated current, thereby form real simulated conditions, carry out self-loopa total power grid-connected aging, wherein electrical network only provides reactive-load compensation and system loss, efficient energy-saving.
The aging testing system Reality simulation loading condition that this example provides is carried out burn-in test, and input side electric current, DC bus-bar voltage and output voltage more approach real load operating mode.
The frequency converter self-loopa aging testing system providing based on above-mentioned example, grid-connected control module control associated components carries out the grid-connected aging detailed process of self-loopa total power following (referring to Fig. 2):
First, the tested frequency converter ac output end of grid-connected control module control active output detections pulse train before being incorporated into the power networks;
The current-responsive that flows through grid-connected reactor by detection is again identified current line voltage phase sequence and phase place;
Then carry out line voltage tracking and carry out the grid-connected output of Current Vector Control by Converter Without Voltage Sensor control technology, because of the existence of step-up transformer in test macro, grid-connected output electric energy is fed back to the rectification input end of tested frequency converter by step-up transformer, the self-loopa that realizes energy is flowed.
Finally, realize frequency converter self-loopa total power burn-in test by controlling grid-connected output current amplitude.
Wherein, the detection pulse train of initiatively exporting before tested frequency converter is incorporated into the power networks is that two of 1/2nd electrical network cycles of the time interval detect pulses, and detecting pulse is bridge conducting simultaneously the lasting PWM cycle on three phase inverter bridge.
For the tested frequency converter of single-phase input, its detection pulse of initiatively exporting before being incorporated into the power networks is output no-voltage; The tested frequency converter of inputting for three-phase, its detection pulse of initiatively exporting before being incorporated into the power networks is bridge conducting simultaneously or the conducting simultaneously of lower bridge or two kinds of each lasting equal times of conducting state on three phase inverter bridge.
Grid-connected control module is in the time of the current line voltage phase sequence of identification and phase place, first grid-connected control module initiatively detects three-phase current peak value after output detections pulse each, convert the current component obtaining under α β coordinate system by Clark, be proportional to line voltage based on current-responsive, utilize trigonometric function relation to go out current electrical network phase place by solving arctangent computation; Then detect pulse place at second and judge electrical network phase sequence by comparing twice detection position electrical network phase changing capacity, enter and be incorporated into the power networks with current electrical network phase place and phase sequence direction immediately.
When grid-connected control module is carried out line voltage tracking by Converter Without Voltage Sensor control technology, it uses electric network voltage phase observer as shown in Figure 3 to carry out line voltage tracking, this observer is realized the grid-connected control of frequency converter Converter Without Voltage Sensor together with Current Vector Control device, line voltage amplitude e
g, electrical network angular frequency
g, grid-connected inductance value L
s, by manipulater, setup parameter is given in advance.Electric network voltage phase observer is by output voltage and output current and electric network model estimation electrical network angular frequency and phase place.
Thus, actual while carrying out frequency converter self-loopa burn-in test, first in test macro, set line voltage amplitude (inductance rear class), frequency, inductance value and output current amplitude.
Then, trigger and be embedded in the grid-connected control module in control circuit on tested frequency converter by controller on tested frequency converter, carry out aging control.
Follow, first grid-connected control module calculates electrical network phase place according to tested frequency converter output detections pulse in 1/2nd electrical network cycles again.
Follow, grid-connected control module is judged electrical network phase sequence according to the change direction of detection of grid phase place again.
Finally, enter grid-connected aging operation according to definite electrical network phase place and phase sequence direction.
As from the foregoing, in concrete test process, the triggering of aging operation, by the contained manipulater of tested frequency converter, can directly be controlled aging power by the grid-connected output current amplitude of setting parameter, easy to operate.
By scheme provided by the invention, make tested frequency converter output current for sinusoidal wave, its power factor can regulate arbitrarily by programming, be set to 1 by power factor, output current amplitude is set as output-current rating, can control ageing system and carry out the aging operation of total power self-loopa, and tested frequency converter input side electric current is not for controlling rectification pulsating current, identical with actual service condition, simulate actual operating mode completely.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (15)
1. a frequency converter self-loopa aging testing system, described aging testing system comprises: an AC network, a step-up transformer, a tested frequency converter, a grid-connected reactor; It is characterized in that,
Described aging testing system also comprises a grid-connected switch and is arranged on the grid-connected control module in tested transducer control circuit, described step-up transformer, grid-connected reactor and grid-connected switch are interconnected to form peripheral test circuit, the tested frequency converter that is provided with grid-connected control module is connected to AC network by this peripheral test circuit, and forms self-loopa burn-in test loop by grid-connected control module control.
2. a kind of frequency converter self-loopa aging testing system according to claim 1, it is characterized in that, in the preferred version of this test macro, in described aging testing system, AC network is connected to the rectification input end of tested frequency converter via step-up transformer, and the ac output end of tested frequency converter is connected to AC network via grid-connected reactor and grid-connected switch successively.
3. a kind of frequency converter self-loopa aging testing system according to claim 1, it is characterized in that, in described aging testing system, AC network is connected directly to the rectification input end of tested frequency converter, and the ac output end of tested frequency converter is connected to AC network via grid-connected reactor, step-up transformer and grid-connected switch successively.
4. according to a kind of frequency converter self-loopa aging testing system described in any one in claims 1 to 3, it is characterized in that, described step-up transformer is isolation boosting transformer or self coupling step-up transformer.
5. according to a kind of frequency converter self-loopa aging testing system described in any one in claims 1 to 3, it is characterized in that, described grid-connected reactor is the filter reactor of L or LC or LCL structure.
6. according to a kind of frequency converter self-loopa aging testing system described in any one in claims 1 to 3, it is characterized in that, described grid-connected switch is grid-connected switch closure after having powered at frequency converter.
7. a kind of frequency converter self-loopa aging testing system according to claim 6, is characterized in that, the closure of described grid-connected switch, by operating personnel's manual closing after frequency converter has powered on, completes defensive position dynamic circuit breaker in test and opens.
8. a kind of frequency converter self-loopa aging testing system according to claim 6, is characterized in that, described grid-connected switch is by inputting electrical network via timing relay control closure.
9. a kind of frequency converter self-loopa aging testing system according to claim 6, is characterized in that, described grid-connected switch is controlled closure automatically by frequency converter output relay node.
10. a frequency converter self-loopa ageing testing method, it is characterized in that, in described method, first control tested frequency converter ac output end active output detections pulse train before being incorporated into the power networks by grid-connected control module, the current-responsive that flows through grid-connected reactor by detection is identified current line voltage phase sequence and phase place;
Then, then carry out line voltage tracking and carry out the grid-connected output of Current Vector Control, grid-connected output electric energy is fed back to the rectification input end of tested frequency converter by step-up transformer, and the self-loopa that realizes energy is flowed;
Finally, realize frequency converter self-loopa total power burn-in test by controlling grid-connected output current amplitude.
11. a kind of frequency converter self-loopa ageing testing methods according to claim 10, is characterized in that, before described tested frequency converter is incorporated into the power networks, initiatively the detection pulse train of output is the detection pulse that is less than the electrical network cycle at least two time intervals.
12. a kind of frequency converter self-loopa ageing testing methods according to claim 10, is characterized in that, for the tested frequency converter of single-phase input, its detection pulse of initiatively exporting before being incorporated into the power networks is output no-voltage.
13. a kind of frequency converter self-loopa ageing testing methods according to claim 10, it is characterized in that, the tested frequency converter of inputting for three-phase, its detection pulse of initiatively exporting before being incorporated into the power networks is bridge conducting simultaneously or the conducting simultaneously of lower bridge or two kinds of each lasting equal times of conducting state on three phase inverter bridge.
14. a kind of frequency converter self-loopa ageing testing methods according to claim 10, it is characterized in that, in described method, be first proportional to line voltage based on current-responsive, calculate current electrical network phase place, then obtain the phase sequence of current electrical network according to the change direction judgement that detects pulse train detected phase.
15. a kind of frequency converter self-loopa ageing testing methods according to claim 10, it is characterized in that, described grid-connected control module is used electric network model reference adaptive observer to carry out line voltage tracking, and this observer is realized the grid-connected control of frequency converter Converter Without Voltage Sensor together with Current Vector Control device.
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