CN107607885A - A kind of variable-frequency power sources pilot system and its experimental control method - Google Patents
A kind of variable-frequency power sources pilot system and its experimental control method Download PDFInfo
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Abstract
The present invention discloses a kind of variable-frequency power sources pilot system and its experimental control method, and pilot system includes transformer, the first variable-frequency power sources and the second variable-frequency power sources, wherein the first variable-frequency power sources, as measurand, the second variable-frequency power sources is as simulation load；First variable-frequency power sources and the second variable-frequency power sources include power network side converter and load side converter respectively；First variable-frequency power sources connects power network, the DC side of DC side connected load side converter by transformer respectively with the AC of the power network side converter of the second variable-frequency power sources；The AC of the load side converter of first variable-frequency power sources is connected with the AC of the load side converter of the second variable-frequency power sources.The present invention utilizes variable-frequency power sources simulated frequency conversion power supply institute on-load, realizes the experiment respectively to two variable-frequency power sources in system by the adjustment of control method, can simplify flow during variable-frequency power sources experiment how to be measured, improve testing efficiency, and cost is relatively low.
Description
Technical field
The present invention relates to applied power electronics experimental technique field, particularly a kind of change that can be applied to bank electricity variable-frequency power sources
Frequency power pilot system and its experimental control method.
Background technology
Variable-frequency power sources is widely used in the fields such as bank electricity, high-power electric and electronic analog power, due to its output services frequency
Rate is different from domestic power network 50HZ frequencies, when carrying out verification experimental verification to it, directly can not be connected with power network.
Experiment to variable-frequency power sources needs to meet several test purposes simultaneously, comprising frequency conversion output accuracy and stability,
The load capacity of variable-frequency power sources, and the dynamic response characteristic of variable-frequency power sources.
It is more complicated system architecture to be also present in existing test method and pilot system when stating test purpose in realization, examination
Test the defects of less efficient.
The content of the invention
It is an object of the invention to provide a kind of variable-frequency power sources pilot system and its experimental control method, variable-frequency power sources mould is utilized
Intend variable-frequency power sources institute on-load, and then variable-frequency power sources is tested, testing efficiency can be improved.
The technical scheme that the present invention takes is：A kind of variable-frequency power sources pilot system, including transformer, the first variable-frequency power sources and
Second variable-frequency power sources, wherein the first variable-frequency power sources, as measurand, the second variable-frequency power sources is as simulation load；
First variable-frequency power sources and the second variable-frequency power sources include power network side converter and load side converter respectively；First variable-frequency power sources
Power network is connected by transformer respectively with the AC of the power network side converter of the second variable-frequency power sources, DC side connected load side becomes
Flow the DC side of device；The AC of the load side converter of first variable-frequency power sources and the load side converter of the second variable-frequency power sources
AC is connected.
Further, in the first variable-frequency power sources and the second variable-frequency power sources, the AC of power network side converter and transformer it
Between, and between the AC of the load side converter of two variable-frequency power sources, it is respectively equipped with gate-controlled switch.When event occurs in pilot system
During barrier, failure can be cut off immediately by gate-controlled switch, avoid influence caused by failure.
Preferably, the transformer is three-winding transformer, and three-winding transformer includes high-pressure side winding, the first low-pressure side
Winding and the second low-pressure side winding, high-pressure side winding connection power network, the first low-pressure side winding and the second low-pressure side winding connect respectively
Connect the AC of the power network side converter of the first variable-frequency power sources and the second variable-frequency power sources.
Preferably, the transformer includes the electricity of two two-winding transformers, the first variable-frequency power sources and the second variable-frequency power sources
The AC of net side current transformer connects power network by a two-winding transformer respectively.
The role of two variable-frequency power sources equipment in variable-frequency power sources pilot system of the present invention is interchangeable, becomes so as to realize to two
The experiment respectively of frequency power equipment.The present invention is using two existing variable-frequency power sources, it is only necessary to increases a three-winding transformer
Or two two-winding transformers, the adjustment of combination controlling method and control strategy, you can realize test function.
The present invention also provides a kind of experimental control method of above-mentioned variable-frequency power sources pilot system, including step：
S1, starts the power network side converter of the first variable-frequency power sources as measurand, and control causes the straight of power network side converter
Flow side voltage stabilization；
S2, starts the load side converter of the first variable-frequency power sources, and control causes the AC voltage and frequency of load side converter
It is stable；
S3, starts the power network side converter of the second variable-frequency power sources as simulation load, and control causes the straight of power network side converter
Flow side voltage stabilization；
S4, starts the load side converter of the second variable-frequency power sources, and control causes the friendship of the load side converter of the second variable-frequency power sources
Side voltage is flowed, tracks the AC voltage of the load side converter of the first variable-frequency power sources；
S5, control make it that the second variable-frequency power sources and the first variable-frequency power sources are grid-connected, then control the load side of the second variable-frequency power sources to become
The ac-side current for flowing device is 0；
S6, the load-carrying capability value of the first variable-frequency power sources institute in power instruction, including setting power instruction is set；
The ac-side current of the load side converter of the second variable-frequency power sources is adjusted according to power instruction so that the second variable-frequency power sources
The load-carrying capability value of first variable-frequency power sources institute in the AC power output tracking power instruction of load side converter；
S7, tested variable-frequency power sources is tested, including：
S71, output stability experiment：
S711, the parameter value in power instruction is changed at least once, change all perform step S6 every time；Detect different work(
The output voltage of first variable-frequency power sources load side AC side of converter in the case of rate order parameter, and calculate different capacity instruction ginseng
The difference in magnitude of output voltage in the case of number；
S712, the threshold value of output voltage amplitude difference is set, judges that the difference in magnitude of output voltage is calculated whether more than defeated in S711
Go out the threshold value of voltage amplitude value difference：If being not more than, judge that tested variable-frequency power sources output stability meets to require；
S72, load capacity experiment：
S721, the parameter in power instruction is adjusted, perform step S6, controlled the AC power output of the second variable-frequency power sources, make
Obtain the first variable-frequency power sources and be operated in rated load；
S722, the first variable-frequency power sources is set to maintain to be operated in rated load in setting time length；The time span of setting terminates
Afterwards, the first variable-frequency power sources temperature and building block are detected；Sentenced according to the damaged condition of temperature variations and building block
Whether disconnected tested variable-frequency power sources meets load capacity；
S73, the experiment of variable-frequency power sources dynamic response characteristic：
S731, change the AC power output of the second variable-frequency power sources using the change of power instruction parameter, simulate sudden load change
Situation；
S732, the amplitude of variation of the first variable-frequency power sources AC output voltage when detection load is mutated, and output voltage change
Recover afterwards to the time of normal value；
Whether S733, the dynamic characteristic for judging tested variable-frequency power sources according to S732 testing result meet to require.
Control of the test method of the present invention to the first variable-frequency power sources and the second variable-frequency power sources, all by two variable-frequency power sources
Control software is filled under existing control module or issues control instruction simultaneously to realize, the various output controls to variable-frequency power sources are existing
There is technology.When the experiment of variable-frequency power sources is finished, it is necessary to when being tested for another variable-frequency power sources of simulation load original work, then
The control software and control instruction filled is exchanged under two variable-frequency power sources, to exchange the role of two variable-frequency power sources in test（Tested pair
As-simulation load）, tested again according to the method for the present invention, you can complete two variable-frequency power sources using same experiment framework
Experiment.
In step S5, control make it that the second variable-frequency power sources and the first variable-frequency power sources are grid-connected, i.e., exchanges the first variable-frequency power sources
Side output voltage and the second variable-frequency power sources AC output voltage are grid-connected, specifically, in two variable-frequency power sources AC output voltages
On the premise of equal, by releasing the blocking of electronic power switch in the second variable-frequency power sources load side converter, reach simultaneously
Mesh.Specific and net operation is prior art.
Further, in step S6, the load-carrying capability value of the first variable-frequency power sources institute in power instruction, including setting are set
Active power value and reactive power value.It is that variable-frequency power sources is carried out to the load capacity value in the power instruction of the second variable-frequency power sources
When band carries experiment, the capability value of fictitious load.Such as make the first variable-frequency power sources band purely resistive load, you can set in power instruction
Active power is certain certain value, and reactive power instruction is arranged to 0, such as makes the first pure inductive load of variable-frequency power sources band, you can sets
Reactive power in power instruction is certain certain value, and active power instruction is arranged to 0.
Preferably, in step S712, the threshold value of output voltage amplitude difference is the 5% of alternating voltage set-point.The alternating current
Pressure set-point is voltage control targe value, and when step S2 is controlled after the first variable-frequency power sources AC output voltage stabilization it is stable
Voltage-target.
Further, in step S6, power instruction is set also to include the power adjusting speed that the second variable-frequency power sources is set.
Preferably, when step S73 carries out the experiment of variable-frequency power sources dynamic response characteristic, power instruction described in step S731 is joined
Several changes include the first variable-frequency power sources load-carrying capability value change, power corresponding to the change set in step S6
Governing speed is 1000kW/s, i.e. each second can be used in by the load capacity value in power instruction from 0 regulation to 1000kW
The situation of sudden load change is simulated, so as to react performance of the variable-frequency power sources in sudden load change, for variable-frequency power sources dynamic characteristic
In experiment.
Beneficial effects of the present invention：
1）The present invention utilizes two variable-frequency power sources equipment, and by different function distributions, a control is variable-frequency power sources, and one controls
It is made as simulating load, and different control methods realizes the function of whole pilot system, increase only a transformer, if
Standby utilization rate is high；
2）The present invention two variable-frequency power sources it is identical on hardware configuration, change two variable-frequency power sources control software program or
The purpose mutually tested can be reached after instruction, improve testing efficiency；
3）Control targe of the present invention by adjustment to the second variable-frequency power sources of simulation load, it is possible to achieve various load conditions
Simulation, can simulate four-quadrant limited load, and the mutation etc. of load, and test function is more complete.
Brief description of the drawings
Fig. 1 show test system architecture principle schematic of the present invention.
Embodiment
Further described below in conjunction with the drawings and specific embodiments.
Embodiment 1
As shown in figure 1, the variable-frequency power sources pilot system of the present invention, including transformer, the first variable-frequency power sources and the second variable-frequency power sources,
Wherein the first variable-frequency power sources is as measurand, and the second variable-frequency power sources is as simulation load；
First variable-frequency power sources and the second variable-frequency power sources include power network side converter and load side converter respectively；First variable-frequency power sources
Power network is connected by transformer respectively with the AC of the power network side converter of the second variable-frequency power sources, DC side connected load side becomes
Flow the DC side of device；The AC of the load side converter of first variable-frequency power sources and the load side converter of the second variable-frequency power sources
AC is connected.
In embodiment shown in Fig. 1, in the first variable-frequency power sources and the second variable-frequency power sources, the AC of power network side converter with
Between transformer, and between the AC of the load side converter of two variable-frequency power sources, it is respectively equipped with gate-controlled switch.When experiment is
When system breaks down, failure can be cut off immediately by gate-controlled switch, avoid influence caused by failure.
Transformer is three-winding transformer, and three-winding transformer includes high-pressure side winding, the first low-pressure side winding and second
Low-pressure side winding, high-pressure side winding connection power network, the first low-pressure side winding and the second low-pressure side winding connect the first frequency conversion respectively
The AC of power supply and the power network side converter of the second variable-frequency power sources.
Embodiment 2
Three-winding transformer in embodiment 1 is replaced with two two-winding transformers, the first variable-frequency power sources and by the present embodiment
The AC of the power network side converter of two variable-frequency power sources connects power network by a two-winding transformer respectively.
In embodiment 1 and embodiment 2, the role of two variable-frequency power sources equipment in variable-frequency power sources pilot system of the present invention can
Exchange, so as to realize the experiment respectively to two variable-frequency power sources equipment.The present invention is using two existing variable-frequency power sources, it is only necessary to increases
Add a three-winding transformer or two two-winding transformers, the adjustment of combination controlling method and control strategy, you can realize
Test function.
Embodiment 3
In embodiment 1 and embodiment 2, using the first variable-frequency power sources S1 as measurand, the second variable-frequency power sources S2 is negative as simulation
Lotus, the experimental control method of variable-frequency power sources pilot system, including step：
S1, starts the power network side converter of the first variable-frequency power sources S1 as measurand, and control causes power network side converter
DC-side Voltage Stabilization；
S2, starts the first variable-frequency power sources S1 load side converter, and control causes the AC voltage and frequency of load side converter
Rate is stable；
S3, starts the power network side converter of the second variable-frequency power sources S2 as simulation load, and control causes power network side converter
DC-side Voltage Stabilization；
S4, starts the second variable-frequency power sources S2 load side converter, and control causes the second variable-frequency power sources S2 load side converter
AC voltage, track the first variable-frequency power sources S1 load side converter AC voltage；
S5, control make it that the second variable-frequency power sources S2 and the first variable-frequency power sources S1 is grid-connected, then control bearing for the second variable-frequency power sources S2
The ac-side current of lotus side converter is 0；
S6, the load-carrying capability value of the first variable-frequency power sources institute in power instruction, including setting power instruction is set；
The ac-side current of the second variable-frequency power sources S2 load side converter is adjusted according to power instruction so that the second variable-frequency power sources
The first load-carrying capability value of variable-frequency power sources S1 institutes in the AC power output tracking power instruction of S2 load side converter；
S7, tested variable-frequency power sources is tested, including：
S71, output stability experiment：
S711, the parameter value in power instruction is changed at least once, change all perform step S6 every time；Detect different work(
The output voltage of first variable-frequency power sources load side AC side of converter in the case of rate order parameter, and calculate different capacity instruction ginseng
The difference in magnitude of output voltage in the case of number；
S712, the threshold value of output voltage amplitude difference is set, judges that the difference in magnitude of output voltage is calculated whether more than defeated in S711
Go out the threshold value of voltage amplitude value difference：If being not more than, judge that tested variable-frequency power sources output stability meets to require；
S72, load capacity experiment：
S721, the parameter in power instruction is adjusted, perform step S6, controlled the AC power output of the second variable-frequency power sources, make
Obtain the first variable-frequency power sources and be operated in rated load；
S722, the first variable-frequency power sources S1 is set to maintain to be operated in rated load in setting time length；The time span knot of setting
Shu Hou, detect the first variable-frequency power sources S1 temperature and building block；According to temperature variations and the damage feelings of building block
Condition judges whether tested variable-frequency power sources S1 meets load capacity；
S73, the experiment of variable-frequency power sources dynamic response characteristic：
S731, change the AC power output of the second variable-frequency power sources using the change of power instruction parameter, simulate sudden load change
Situation；
S732, the amplitude of variation of the first variable-frequency power sources S1 AC output voltages when detection load is mutated, and output voltage become
Recover after change to the time of normal value；
Whether S733, the dynamic characteristic for judging tested variable-frequency power sources according to S732 testing result meet to require.
Power instruction in the present invention, can real time modifying, and can be sent host computer in a manner of real-time communication to work
To simulate the second variable-frequency power sources control module of load.When being tested, host computer can be connected logical respectively with two variable-frequency power sources
News.
Control of the test method of the present invention to the first variable-frequency power sources and the second variable-frequency power sources, all by two variable-frequency power sources
Control software is filled under existing control module and issues control instruction simultaneously to realize, the various output controls to variable-frequency power sources are existing
Technology.Test and finished, it is necessary to when being tested for another variable-frequency power sources of simulation load original work when a variable-frequency power sources, then adjust
The control software and control instruction filled is changed under two variable-frequency power sources, to exchange the role of two variable-frequency power sources in test（Measurand-
Simulate load）, tested again according to the method for the present invention, you can the examination of two variable-frequency power sources is completed using same experiment framework
Test.
In step S5, control make it that the second variable-frequency power sources and the first variable-frequency power sources are grid-connected, i.e., exchanges the first variable-frequency power sources
Side output voltage and the second variable-frequency power sources AC output voltage are grid-connected, specifically, in two variable-frequency power sources AC output voltages
On the premise of equal, by releasing the blocking of electronic power switch in the second variable-frequency power sources load side converter, reach simultaneously
Mesh.Specific and net operation is prior art.
In step S712, the threshold value of output voltage amplitude difference is the 5% of alternating voltage set-point.The alternating voltage gives
Value is voltage control targe value, and burning voltage mesh when step S2 is controlled after the first variable-frequency power sources AC output voltage stabilization
Scale value.Such as by adjusting S2 power, variable-frequency power sources is operated in various typical load operating modes, as 200kW, 400kW,
600kW, 800kW, detection variable-frequency power sources S1 output voltage, if S1 output voltages change greatly during different capacity value, with control
Target processed（Alternating voltage set-point）480V has big difference, that is, thinks that variable-frequency power sources is unstable, for the present embodiment, variable-frequency power sources
Difference of the output voltage under each operating mode not should be greater than the 5% of 480V, i.e. 24V.
When carrying out the experiment of variable-frequency power sources load capacity, S2 is S1 load, adjusts S2 power, S1 is operated in volume
Constant load situation 800kW, the system is now allowed continuously to run a period of time, in this embodiment setting operation 72 hours, if in S1
The temperature stabilization of each synthesizer part, and no any parts damages, that is, think that the load capacity of variable-frequency power sources has reached 800kW,
Conversely, any device failure be present, that is, think that the load capacity of variable-frequency power sources does not reach 800kW.
In step S6, the load-carrying capability value of the first variable-frequency power sources institute in power instruction, including setting active power are set
Value and reactive power value.It is to carry out band to variable-frequency power sources to carry experiment to the load capacity value in the power instruction of the second variable-frequency power sources
When, the capability value of fictitious load.Such as make the first variable-frequency power sources band purely resistive load, you can the active power in power instruction is set
For certain certain value, reactive power instruction is arranged to 0, such as makes the first pure inductive load of variable-frequency power sources band, you can sets power instruction
In reactive power be certain certain value, active power instruction is arranged to 0.
In step S6, power instruction is set also to include the power adjusting speed that the second variable-frequency power sources is set.Enter in step S73
When row variable-frequency power sources dynamic response characteristic is tested, the change of power instruction parameter described in step S731 includes the first variable-frequency power sources institute
The change of load-carrying capability value, power adjusting speed corresponding to the change set in step S6 is 1000kW/s, i.e., per second
Clock can be used in simulating the situation of sudden load change, so as to anti-by the load capacity value in power instruction from 0 regulation to 1000kW
Performance of the variable-frequency power sources in sudden load change is answered, in the experiment for variable-frequency power sources dynamic characteristic.
In the case of sudden load change, the amplitude of variation of the dynamic characteristic of variable-frequency power sources, i.e. variable-frequency power sources output voltage is examined,
And the time of normal value is returned to after output voltage change, amplitude of variation is not to be exceeded ± 10% in the present embodiment, returns to
The time of normal value is no more than 1s, within the range, it is believed that the dynamic property of variable-frequency power sources meets to require, is otherwise unsatisfactory for
It is required that.
Above example is merely to illustrate technical scheme rather than its limitations, is carried out with reference to above-described embodiment
Various forms is changed or changed within protection scope of the present invention.
Claims (9)
1. a kind of variable-frequency power sources pilot system, it is characterized in that, including transformer, the first variable-frequency power sources and the second variable-frequency power sources, its
In the first variable-frequency power sources as measurand, the second variable-frequency power sources is as simulation load；
First variable-frequency power sources and the second variable-frequency power sources include power network side converter and load side converter respectively；First variable-frequency power sources
Power network is connected by transformer respectively with the AC of the power network side converter of the second variable-frequency power sources, DC side connected load side becomes
Flow the DC side of device；The AC of the load side converter of first variable-frequency power sources and the load side converter of the second variable-frequency power sources
AC is connected.
2. variable-frequency power sources pilot system according to claim 1, it is characterized in that, the first variable-frequency power sources and the second variable-frequency power sources
In, between the AC and transformer of power network side converter, and between the AC of the load side converter of two variable-frequency power sources,
It is respectively equipped with gate-controlled switch.
3. variable-frequency power sources pilot system according to claim 1 or 2, it is characterized in that, the transformer is three winding transformation
Device, three-winding transformer include high-pressure side winding, the first low-pressure side winding and the second low-pressure side winding, high-pressure side winding connection electricity
Net, the first low-pressure side winding and the second low-pressure side winding connect the first variable-frequency power sources respectively and the grid side of the second variable-frequency power sources becomes
Flow the AC of device.
4. variable-frequency power sources pilot system according to claim 1 or 2, it is characterized in that, the transformer includes two double wraps
The AC of the power network side converter of group transformer, the first variable-frequency power sources and the second variable-frequency power sources is become by a double winding respectively
Depressor connects power network.
5. the experimental control method of variable-frequency power sources pilot system described in a kind of Claims 1-4, it is characterized in that, including step：
S1, starts the power network side converter of the first variable-frequency power sources as measurand, and control causes the straight of power network side converter
Flow side voltage stabilization；
S2, starts the load side converter of the first variable-frequency power sources, and control causes the AC voltage and frequency of load side converter
It is stable；
S3, starts the power network side converter of the second variable-frequency power sources as simulation load, and control causes the straight of power network side converter
Flow side voltage stabilization；
S4, starts the load side converter of the second variable-frequency power sources, and control causes the friendship of the load side converter of the second variable-frequency power sources
Side voltage is flowed, tracks the AC voltage of the load side converter of the first variable-frequency power sources；
S5, control make it that the second variable-frequency power sources and the first variable-frequency power sources are grid-connected, then control the load side of the second variable-frequency power sources to become
The ac-side current for flowing device is 0；
S6, the load-carrying capability value of the first variable-frequency power sources institute in power instruction, including setting power instruction is set；
The ac-side current of the load side converter of the second variable-frequency power sources is adjusted according to power instruction so that the second variable-frequency power sources
The load-carrying capability value of first variable-frequency power sources institute in the AC power output tracking power instruction of load side converter；
S7, tested variable-frequency power sources is tested, including：
S71, output stability experiment：
S711, the parameter value in power instruction is changed at least once, change all perform step S6 every time；Detect different work(
The output voltage of first variable-frequency power sources load side AC side of converter in the case of rate order parameter, and calculate different capacity instruction ginseng
The difference in magnitude of output voltage in the case of number；
S712, the threshold value of output voltage amplitude difference is set, judges that the difference in magnitude of output voltage is calculated whether more than defeated in S711
Go out the threshold value of voltage amplitude value difference：If being not more than, judge that tested variable-frequency power sources output stability meets to require；
S72, load capacity experiment：
S721, the parameter in power instruction is adjusted, perform step S6, controlled the AC power output of the second variable-frequency power sources, make
Obtain the first variable-frequency power sources and be operated in rated load；
S722, the first variable-frequency power sources is set to maintain to be operated in rated load in setting time length；The time span of setting terminates
Afterwards, the first variable-frequency power sources temperature and building block are detected；Sentenced according to the damaged condition of temperature variations and building block
Whether disconnected tested variable-frequency power sources meets load capacity；
S73, the experiment of variable-frequency power sources dynamic response characteristic：
S731, change the AC power output of the second variable-frequency power sources using the change of power instruction parameter, simulate sudden load change
Situation；
S732, the amplitude of variation of the first variable-frequency power sources AC output voltage when detection load is mutated, and output voltage change
Recover afterwards to the time of normal value；
Whether S733, the dynamic characteristic for judging tested variable-frequency power sources according to S732 testing result meet to require.
6. according to the method for claim 5, it is characterized in that, in step S6, set the first variable-frequency power sources institute in power instruction
Load-carrying capability value, including setting active power value and reactive power value.
7. according to the method for claim 5, it is characterized in that, in step S712, the threshold value of output voltage amplitude difference is exchange
The 5% of voltage set-point.
8. according to the method for claim 5, it is characterized in that, in step S6, power instruction is set also to include setting second to become
The power adjusting speed of frequency power.
9. according to the method for claim 8, it is characterized in that, variable-frequency power sources dynamic response characteristic experiment is carried out in step S73
When, the change of power instruction parameter described in step S731 include the first variable-frequency power sources load-carrying capability value change, step
Power adjusting speed corresponding to the change set in S6 is 1000kW/s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111736024A (en) * | 2020-06-29 | 2020-10-02 | 南京南瑞继保电气有限公司 | Test system of power equipment and control method thereof |
| CN112924863A (en) * | 2021-01-27 | 2021-06-08 | 臻驱科技（上海）有限公司 | System and method for testing load shedding of motor under test platform |
| CN113640693A (en) * | 2020-04-24 | 2021-11-12 | 国网江苏省电力有限公司电力科学研究院 | Power electronic transformer operation system and control method |
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