CN107340444A - A kind of voltage ride-through test system and method - Google Patents
A kind of voltage ride-through test system and method Download PDFInfo
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- CN107340444A CN107340444A CN201710639396.8A CN201710639396A CN107340444A CN 107340444 A CN107340444 A CN 107340444A CN 201710639396 A CN201710639396 A CN 201710639396A CN 107340444 A CN107340444 A CN 107340444A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
A kind of voltage ride-through test system, operating voltage is switched fast, tests service behaviour of the frequency converter in transient overvoltage and low-voltage, comprising：Adjustable transformer, output end set 5 taps, draw the voltage of 5 kinds of different amplitudes respectively；Shunting switch, comprising 8 inputs, an output end, described 8 inputs are connected with 5 taps of the output end of the adjustable transformer；Frequency converter, it is connected with the shunting switch；Tunable load, it is connected with the frequency converter, the size of tunable load is adjusted according to the different output voltages of frequency converter；Control recorder; it is connected respectively with adjustable transformer, shunting switch, frequency converter and tunable load; the working condition of recorder control adjustable transformer, shunting switch and frequency converter is controlled, and gathers frequency converter input, voltage, current waveform and the switch protection action signal of output.The present invention ensures the safe, reliable, efficient normal operation of power plant's frequency converter, avoids stopping accident.
Description
Technical field
The present invention relates to electric power network control field, and in particular to a kind of voltage ride-through test system and method.
Background technology
With vigorously implementing for national energy-saving policy, power station auxiliary system carries out a large amount of frequency converter transformations, to reduce machine
Group station service.But the subsidiary engine frequency converter low voltage ride-through capability of most of fired power generating units is non-verified at present, some is even
Do not possess low voltage ride-through capability, power network occur and the problem of instantaneous voltage fluctuation causes generating set chaser occurs；Due to becoming
Frequency device is tested without low voltage ride-through function, once there is Voltage Drop or too high, frequency converter can trigger low-voltage and excessively stream
Deng protection, frequency converter locking is caused to export, for high voltage converter, supply is all Important Auxiliary equipment, once frequency converter locking, important
The stoppage in transit of subsidiary engine can ultimately result in the generation of unit tripping accident.
At present, thermal power plant's coal-powder boiler is most as application of frequency converter to coal, machine supplying powder, preheater, air cooling blower fan system
Equipment, particularly control the frequency converter contributed to coal machine supplying powder, preheater, air cooling blower fan, once low-voltage occurs, protection is dynamic
Make, often result in the failures such as Important Auxiliary equipment shutdown, unit tripping.In actual use, because grid collapses or standby
When hauling oneself willingly into switching, service power voltage is instantaneous or is less than frequency converter under-voltage protection setting valve in short-term（It is different according to frequency converter model
The value is also different）When, frequency converter under-voltage protection can also act, and station service and frequency converter bus under-voltage protection setting valve lead to
Often be less than frequency converter under-voltage protection setting valve, the miscellaneous equipment in station service electrical system is also in normal work, and once frequency converter is guarantor
Locking is protected, subsidiary engine work out of service, may cause to shut down blowing out failure, very big economic loss is brought to power plant, is also turned into
One of power plant's chaser Frequent Accidents reason, at the same be also current power plant face it is bigger the problem of, only well solve should
Problem, power plant safety, reliable, efficient normal operation are just can guarantee that, avoid shutting down blowing out accident and occur.
The content of the invention
It is an object of the invention to provide a kind of voltage ride-through test system and method, applied to frequency converter low voltage crossing
Ability.
A kind of voltage ride-through test system, is switched fast operating voltage, and test frequency converter is in overvoltage and low-voltage
Service behaviour, comprising：
Adjustable transformer, output end set 5 taps, draw the voltage of 5 kinds of different amplitudes respectively；
Shunting switch, comprising 8 inputs, an output end, controlled by artificial or programmed controller, among 8 inputs
Selection one is connected to output end, and described 8 inputs are connected with 5 taps of the output end of the adjustable transformer；
Frequency converter, it is connected with the adjustable transformer and shunting switch output end；
Tunable load, it is connected with the frequency converter, the size of tunable load is adjusted according to the different output valves of frequency converter；
Recorder is controlled, is connected respectively with adjustable transformer, shunting switch and frequency converter, control recorder controls adjustable transformation
The working condition of device, shunting switch and frequency converter, and gather frequency converter（3）Input, the voltage of output, current waveform and switch are protected
Protect action signal.
A kind of above-mentioned voltage ride-through test system, wherein, if resistive load of the tunable load comprising some series connection,
The inductive load and blower fan of dry series connection, some resistive loads and some inductive loads set some taps respectively, described to take out
The selection of head changes according to the voltage and frequency of the frequency converter, and permanent magnetic flux v/f control mode mode tunings are pressed in load；Institute
Fine tuning of the blower fan as inductive load is stated, makes up load regulation neutral；Blower fan also aids in radiating to the tunable load.
A kind of above-mentioned voltage ride-through test system, wherein, 5 taps of the adjustable transformer export respectively 20%U,
60%U, 90%U, 100%U and 130%U, wherein U represent the rated voltage of frequency converter.
A kind of above-mentioned voltage ride-through test system, wherein, 8 inputs of the shunting switch are sequentially connected magnitude of voltage
For 130%U, 100%U, 90%U, 100%U, 60%U, 100%U, 20%U and 100%U.
A kind of above-mentioned voltage ride-through test system, wherein, the control recorder also includes：
Central controller, the system-wide working condition of centralized Control；
Memory module is compressed, input is connected with central controller, exchanges the data of storage, preserve data in time；
Data acquisition module, output end are connected with central controller and compression memory module, voltage x current and frequency in acquisition system
Rate information；
Waveform analysis module, the information that real-time recorded data acquisition module collects, waveform is drawn, calculating measurement is carried out to waveform
And analysis；
Display module, it is connected with central controller, display waveform and instruction button；
Print module, it is connected with central controller, output papery report.
A kind of above-mentioned voltage ride-through test system, wherein, the data acquisition module uses 8 channel isolations, 16
High-speed a/d converter.
A kind of above-mentioned voltage ride-through test system, wherein, the compression memory module, which includes, is locally stored module and shifting
Dynamic memory module two parts, module is locally stored and is connected with data acquisition module and mobile memory module, mobile memory module bag
Containing 2 USB interfaces, for connecting outside movable storage device.
A kind of above-mentioned voltage ride-through test system, wherein, the waveform analysis module includes waveform recording module and ginseng
Number computing module two parts, waveform recording module are connected with central controller and parameter calculating module, and parameter calculating module is with
Entreat controller connection.
A kind of voltage ride-through method of testing, control recorder control the shunting switch to switch different voltages successively, and together
When record data, step is as follows：
S1, the shunting switch output end are arranged at the 8th input, and output voltage 100%U, wherein U represent frequency converter
Rated voltage；
S2, the shunting switch（2）Output end switches to the 1st input, output voltage 130%U, 0.5 second retention time；
S3, the shunting switch（2）Output end switches to the 2nd input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S4, the shunting switch（2）Output end switches to the 3rd input, output voltage 90%U, and the retention time is more than 5 seconds,
Treat frequency converter（3）Operation reads frequency converter to stabilization（3）Working condition；
S5, the shunting switch（2）Output end switches to the 4th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S6, the shunting switch（2）Output end switches to the 5th input, output voltage 60%U, and the retention time is 5 seconds；
S7, the shunting switch（2）Output end switches to the 6th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S8, the shunting switch（2）Output end switches to the 7th input, output voltage 20%U, is kept for 0.5 second；
S9, the shunting switch（2）Output end switches to the 8th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S10, the control recorder judge whether frequency converter normal operation and records all test parameters and waveform, experiment process
In such as a certain project test failure, then be directly entered next pilot project；
S11, the control recorder assess the low voltage ride-through capability of system under test (SUT), generate analysis report.
The advantages of the present invention are：
（1）Ensure power plant safety, reliable, efficient normal operation.
（2）Unit tripping or boiler extinguishment are prevented, causes non-programmed halt accident.
Brief description of the drawings
Fig. 1 is the device connection diagram of the present invention.
Fig. 2 is the block diagram that recorder is controlled in the present invention.
Fig. 3 is the control software flow chart that recorder is controlled in the present invention.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferable specific embodiment in detail, the present invention is further elaborated.
As shown in figure 1, in power plant's plant-grid connection adjustable transformer 1, supply voltage is switched to different electricity by adjustable transformer 1
Pressure value, selected and switched by shunting switch 2, the magnitude of voltage needed for output test is to frequency converter 3.Control the control switching of recorder 4
Process and record data and analytical performance, finally provide report.
A kind of voltage ride-through test system, is switched fast operating voltage, and test frequency converter 3 is in overvoltage and low-voltage
Service behaviour, include adjustable transformer 1, shunting switch 2, frequency converter 3, tunable load 5 and control recorder 4.Instrument it is each defeated
Enter, be mutually isolated between output channel, in case the connectivity problem of different potentials point causes system under test (SUT) to break down in experiment.
Adjustable transformer 1, output end set 5 taps, draw the voltage of 5 kinds of different amplitudes respectively；
Shunting switch 2, comprising 8 inputs, an output end, controlled by artificial or programmed controller, among 8 inputs
Selection one is connected to output end, and described 8 inputs are connected with 5 taps of the output end of the adjustable transformer 1；
Frequency converter 3, it is connected with the adjustable transformer 1, shunting switch 2；
Tunable load 5, is connected with the frequency converter 3, and the size of tunable load 5 is adjusted according to the different output valves of frequency converter 3；
Recorder 4 is controlled, is connected respectively with adjustable transformer 1, shunting switch 2 and frequency converter 3, control recorder 4 controls adjustable
The working condition of transformer 1, shunting switch 2 and frequency converter 3, and gather the output end of adjustable transformer 1 and the input of frequency converter 3
Voltage x current information.Voltage, electric current, frequency and the changed power situation of test product mains side and load-side are recorded after off-test,
And transient signal is recorded, the voltage waveform during food preservation test.According to the equipment operation condition during experiment and
The voltage waveform of preservation, the low voltage ride-through capability of this frequency conversion speed-adjusting system is assessed, automatically generates analysis report.
Further, the tunable load 5 includes the resistive load of some series connection, the inductive load and wind of some series connection
Machine, some resistive loads and some inductive loads set some taps respectively, and the selection of the tap is according to the frequency conversion
Voltage and the frequency of device 3 and change, load press permanent magnetic flux v/f control mode mode tunings；The blower fan is as inductive load
Fine tuning, make up load regulation neutral；Blower fan also aids in radiating to the tunable load 5.
The tunable load 5 is high-voltage large-capacity fictitious load, and it is 10kV that can bear highest load voltage.By changing
Resistive load and the connection in series-parallel state of inductive load are stated, simulates different types of load.It is 300kVA- for simulating capacity
3000kVA, the actual loading that power factor is 0.7 ~ 0.9.
The ohmic load module is formed by connecting by high temperature resistance super alloyage electric resistance of stainless.Electric resistance of stainless tube material is
Nickel chromium triangle aluminium resistance wire stainless steel heating wire, it is ensured that the stability of load resistance.
The blower fan uses 6kV blower fans, power 300kVar, as the fine tuning of inductive load, makes up between 0-300kVar
Adjust neutral；Load is radiated in blower fan also auxiliary chamber, prevents from loading hot function.
Blower fan sets defencive function to have：
Overvoltage protection：When load input voltage exceedes warning value, alarm and unload automatically；
Short circuit, overcurrent protection：Load circuit is furnished with breaker, and short circuit or electric current unload automatically when excessive；
Temperature protection：When load temperature exceedes warning value, alarm and manual or automatic unloading；
Fan pressure is protected：During the deficiency in draught of any Fans, unload and alarm automatically；
Fan safe is protected：Automatic unloading protecting is loaded when mechanically or electrically failure occurs for blower fan；
Emergent stopping：Can manual key forced unloading, can not load under jerk lock-out state；
Phase sequence：, can be with automatic conversion when loading phase sequence wrong.
Whole tunable load 5 is arranged in a container, casing high temperature resistant, cold, Exposure to Sunlight, is drenched with rain, moisture, anti-salt
Mist, dust-proof, anticorrosion, mould proof, tank surface coating is maritime affairs paint, reaches normal container application grade.
Further, 5 taps of the adjustable transformer 1 export 20%U, 60%U, 90%U, 100%U and 130%U respectively,
Wherein U represents the rated voltage of frequency converter 3.
Further, 8 inputs of the shunting switch 2 be sequentially connected magnitude of voltage for 130%U, 100%U, 90%U,
100%U, 60%U, 100%U, 20%U and 100%U.
Further, as shown in Fig. 2 it is described control recorder 4 also comprising central controller 41, compression memory module 42,
Data acquisition module 43, waveform analysis module 44 and print module 46.
Central controller 41, the system-wide working condition of centralized Control；
Memory module 42 is compressed, input is connected with central controller 41, exchanges the data of storage, preserve data in time；
Data acquisition module 43, output end are connected with central controller 41 and compression memory module 42, voltage electricity in acquisition system
Stream and frequency information；
Waveform analysis module 44, the information that real-time recorded data acquisition module 43 collects, waveform is drawn, waveform is calculated
Measurement and analysis；
Display module 45, it is connected with central controller 41, from big color screen, the ripple of real-time display current voltage electric current and frequency
Shape, from touch-screen, facilitate experimenter's operational order button；
Print module 46, it is connected with central controller 41, output papery report.
Further, the data acquisition module 43 uses 8 passages, 16 high-speed a/d converters.Voltage signal acquisition is missed
Difference<0.2V；Current signal Acquisition Error<0.02mA；Frequency error measurement<0.01Hz.
Further, the compression memory module 42, which includes, is locally stored module and mobile memory module two parts, local
Memory module is connected with data acquisition module 43 and mobile memory module, and mobile memory module includes 2 USB interfaces, for even
Connect outside movable storage device.
Further, the waveform analysis module 44 includes waveform recording module and parameter calculating module two parts, waveform
Logging modle is connected with central controller 41 and parameter calculating module, and parameter calculating module is connected with central controller 41.
As shown in figure 3, the output voltage of adjustable transformer 1 is controlled temporarily to drop by shunting switch 2 by control recorder 4 during experiment
Value and time, by the gathered data of data acquisition module 43, the wave recording of waveform analysis module 44, central controller 41 judges experiment
State.After off-test operating personnel use waveform analysis module 44 in waveform analysis and statistical tool, graphic plotting instrument,
Waveform combination operational tool, virtual value calculating, power calculation, phasor diagram instrument are checked and analyzed to the data of record.Examination
WORD/EXCEL form test reports can be generated by testing data and analysis result, can also be exported by Software Create JPG pictures.Examination
Test report to indicate curve automatically, make test report and fully achieve automation.Instrument internal can also be preset for being somebody's turn to do
The template of experiment, experimenter is set to be readily achieved measurement and the record of test data, the automatic experiment ginseng calculated in experiment template
Number.
A kind of voltage ride-through method of testing, control recorder 4 control the shunting switch 2 to switch different voltages successively, and
Record data, step are as follows simultaneously：
S1, the output end of the shunting switch 2 are arranged at the 8th input, and output voltage 100%U, wherein U represent frequency converter 3
Rated voltage；
S2, the shunting switch（2）Output end switches to the 1st input, output voltage 130%U, 0.5 second retention time；
S3, the shunting switch（2）Output end switches to the 2nd input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S4, the shunting switch（2）Output end switches to the 3rd input, output voltage 90%U, and the retention time is more than 5 seconds,
Treat frequency converter（3）Operation reads frequency converter to stabilization（3）Working condition；
S5, the shunting switch（2）Output end switches to the 4th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S6, the shunting switch（2）Output end switches to the 5th input, output voltage 60%U, and the retention time is 5 seconds；
S7, the shunting switch（2）Output end switches to the 6th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S8, the shunting switch（2）Output end switches to the 7th input, output voltage 20%U, is kept for 0.5 second；
S9, the shunting switch（2）Output end switches to the 8th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S10, the control recorder 4 judge whether frequency converter normal operation and records all test parameters and waveform, test
Such as a certain project test failure in journey, then next pilot project is directly entered；
S11, the control recorder 4 assess the low voltage ride-through capability of system under test (SUT), generate analysis report.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. a kind of voltage ride-through test system, being switched fast operating voltage, frequency converter is tested（3）In instantaneous overvoltage and low-voltage
When service behaviour, it is characterised in that include：
Adjustable transformer（1）, output end sets 5 taps, draws the voltage of 5 kinds of different amplitudes respectively；
Shunting switch（2）, comprising 8 inputs, an output end, controlled by artificial or programmed controller, 8 inputs it
Middle selection one is connected to output end, described 8 inputs and the adjustable transformer（1）Output end 5 taps connect
Connect；
Frequency converter（3）, with the shunting switch（2）With adjustable transformation（1）Connection；
Tunable load（5）, with the frequency converter（3）Connection, according to frequency converter（3）Different output voltages and adjust tunable load
（5）Size；
Control recorder（4）, with adjustable transformer（1）, shunting switch（2）, frequency converter（3）, tunable load（5）Connect respectively,
Control recorder（4）Control adjustable transformer（1）, shunting switch（2）And frequency converter（3）Working condition, and gather frequency converter
（3）Input, voltage, current waveform and the switch protection action signal of output.
A kind of 2. voltage ride-through test system as claimed in claim 1, it is characterised in that the tunable load（5）If comprising
The resistive load of dry series connection, the inductive load and blower fan of some series connection, some resistive loads and some inductive loads difference
Some taps are set, and the selection of the tap is according to the frequency converter（3）Voltage and frequency and change, load press permanent magnetic flux
V/f control mode mode tunings；Fine tuning of the blower fan as inductive load, makes up load regulation neutral；Blower fan also aids in pair
The tunable load（5）Radiated.
A kind of 3. voltage ride-through test system as claimed in claim 1, it is characterised in that the adjustable transformer（1）5
Tap exports 20%U, 60%U, 90%U, 100%U and 130%U respectively, and wherein U represents frequency converter（3）Rated voltage.
A kind of 4. voltage ride-through test system as claimed in claim 3, it is characterised in that the shunting switch（2）8 it is defeated
It is 130%U, 100%U, 90%U, 100%U, 60%U, 100%U, 20%U and 100%U to enter the magnitude of voltage that end is sequentially connected.
A kind of 5. voltage ride-through test system as claimed in claim 1, it is characterised in that the control recorder（4）Also wrap
Contain：
Central controller（41）, the system-wide working condition of centralized Control；
Compress memory module（42）, input and central controller（41）Connection, exchanges the data of storage, preserves data in time；
Data acquisition module（43）, output end and central controller（41）With compression memory module（42）Connect, in acquisition system
Voltage x current and frequency information；
Waveform analysis module（44）, real-time recorded data acquisition module（43）The information collected, waveform is drawn, waveform is carried out
Calculate measurement and analysis；
Display module（45）, with central controller（41）Connection, display waveform and instruction button；
Print module（46）, with central controller（41）Connection, output papery report.
A kind of 6. voltage ride-through test system as claimed in claim 5, it is characterised in that the data acquisition module（43）Adopt
With 8 channel isolations, 16 high-speed a/d converters.
A kind of 7. voltage ride-through test system as claimed in claim 5, it is characterised in that the compression memory module（42）Bag
Containing module and mobile memory module two parts is locally stored, module and data acquisition module is locally stored（43）Mould is stored with mobile
Block connects, and mobile memory module includes 2 USB interfaces, for connecting outside movable storage device.
A kind of 8. voltage ride-through test system as claimed in claim 5, it is characterised in that the waveform analysis module（44）Bag
Module containing waveform recording and parameter calculating module two parts, waveform recording module and central controller（41）And parameter calculating module
Connection, parameter calculating module and central controller（41）Connection.
A kind of 9. voltage ride-through method of testing, it is characterised in that control recorder（4）Control the shunting switch（2）Cut successively
Different voltages are changed, and record data simultaneously, step are as follows：
S1, the shunting switch（2）Output end is arranged at the 8th input, and output voltage 100%U, wherein U represent frequency converter
（3）Rated voltage；
S2, the shunting switch（2）Output end switches to the 1st input, output voltage 130%U, 0.5 second retention time；
S3, the shunting switch（2）Output end switches to the 2nd input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S4, the shunting switch（2）Output end switches to the 3rd input, output voltage 90%U, and the retention time is more than 5 seconds,
Treat frequency converter（3）Operation reads frequency converter to stabilization（3）Working condition；
S5, the shunting switch（2）Output end switches to the 4th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S6, the shunting switch（2）Output end switches to the 5th input, output voltage 60%U, and the retention time is 5 seconds；
S7, the shunting switch（2）Output end switches to the 6th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S8, the shunting switch（2）Output end switches to the 7th input, output voltage 20%U, is kept for 0.5 second；
S9, the shunting switch（2）Output end switches to the 8th input, output voltage 100%U, treats frequency converter（3）Operation
To stable, reading frequency converter（3）Working condition；
S10, the control recorder（4）Judge whether frequency converter normal operation and records all test parameters and waveform, test
During such as a certain project test failure, then be directly entered next pilot project；
S11, the control recorder（4）The low voltage ride-through capability of system under test (SUT) is assessed, generates analysis report.
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| CN201710639396.8A CN107340444B (en) | 2017-07-31 | 2017-07-31 | Voltage ride-through test system and method |
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Cited By (1)
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| CN108051670A (en) * | 2017-12-05 | 2018-05-18 | 深圳国创名厨商用设备制造有限公司南海分公司 | A kind of transformer testing frock |
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| Publication number | Publication date |
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| CN107340444B (en) | 2023-08-01 |
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