CN110011308A - A kind of modularization power grid background harmonics simulator and its control method - Google Patents
A kind of modularization power grid background harmonics simulator and its control method Download PDFInfo
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- CN110011308A CN110011308A CN201910335255.6A CN201910335255A CN110011308A CN 110011308 A CN110011308 A CN 110011308A CN 201910335255 A CN201910335255 A CN 201910335255A CN 110011308 A CN110011308 A CN 110011308A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of modularization power grid background harmonics simulator and its control methods, comprising: main control unit, full-controlled rectifier unit, harmonic voltage generating unit and host computer；The main control unit is separately connected with full-controlled rectifier unit, harmonic voltage generating unit and host computer；Ac input end is sequentially connected in series full-controlled rectifier unit and harmonic voltage generating unit；Main control unit receives the power grid background harmonic voltage data parameters information that host computer is sent, and according to the delivering control instruction received, controls harmonic voltage generating unit and generate corresponding background harmonic voltage；To main control unit, main control unit is adjusted control instruction according to the feedback signal received the Hall voltage sampled signal feedback that the output of harmonic voltage generating unit is surveyed.The present invention provides high-precision, intelligentized power grid background harmonic voltage for simulating partial electric grid background harmonic voltage, for tested equipment dynamic detection.
Description
Technical field
The present invention relates to power grid background characteristics analogue technique fields, more particularly to a kind of modularization power grid background harmonics mould
Quasi- device and its control method.
Background technique
Only there is provided background technical informations related to the present invention for the statement of this part, it is not necessary to so constitute first skill
Art.
It is higher and higher to electrical equipment performance, reliability requirement with the development of power technology, electrical equipment can be held
Corresponding standard requirements are proposed by the tolerance degree of background power quality situation；Wherein, power grid background harmonic voltage is power grid
In an important feature parameter, be directly related to equipment to the ability to bear of harmonic wave, equipment is to economic technologies such as the tolerances of harmonic wave
Problem.
Under normal circumstances, power grid provides the sinusoidal voltage source of three-phase symmetrical, therefore power grid the case where all kinds of failures occurs simultaneously
It is uncommon.Therefore when test equipment is grid-connected, it would be desirable to be able to which simulation generates the device of all kinds of failures of power grid.
Inventors have found that conventional voltage fluctuation, high-low pressure test, it can be to test equipment voltage amplitude using regulator
Value variation is simulated, by adjusting outlet side voltage magnitude, simulating grid scope range of the fluctuation of voltage, but to the background of supply voltage
Harmonic content size cannot be simulated.
When carrying out dynamic detection to various power quality equipments, need to simulate actual power grid background voltage harmonic wave；Using
Normal grid simulator passes through the frequency and phase of control output voltage, although it is humorous to simulate the specific background of power grid
Wave, still, topological structure generally use device for high-power power electronic, and control precision is lower, exist simultaneously equipment failure rate
The problems such as height, volume are big, and flexibility is poor.
Summary of the invention
To solve the deficiencies in the prior art, the present invention proposes a kind of modularization power grid background harmonics simulator and its control
Method can simulate partial electric grid background harmonic voltage, provide high-precision, intelligentized electricity for power quality equipment dynamic detection
Net background harmonic voltage meets the testing requirement of distinct device.
In some embodiments, it adopts the following technical scheme that
A kind of modularization power grid background harmonics simulator, comprising: main control unit, full-controlled rectifier unit, harmonic voltage hair
Raw unit and host computer；The main control unit is separately connected with full-controlled rectifier unit, harmonic voltage generating unit and host computer；It hands over
Stream input terminal is sequentially connected in series full-controlled rectifier unit and harmonic voltage generating unit；
Main control unit receives the power grid background harmonic voltage data parameters information that host computer is sent, and according to the letter received
Breath issues control instruction, and control harmonic voltage generating unit generates corresponding background harmonic voltage；Harmonic voltage generating unit is defeated
The Hall voltage sampled signal feedback surveyed out to main control unit, main control unit according to the feedback signal received to control instruction into
Row adjustment.
Further, the host computer is connect with remote monitoring platform, sends electricity to host computer by remote monitoring platform
The information received is sent to main control unit by net background harmonic voltage data parameters information, host computer；Alternatively, long-range monitoring is flat
Platform directly sends power grid background harmonic voltage data parameters information to main control unit.
Further, the full-controlled rectifier unit includes several full-controlled rectifier subelements being connected in parallel, the harmonic wave electricity
Pressure generating unit includes that subelement occurs for several harmonic voltages, each full-controlled rectifier subelement connects a harmonic voltage and occurs
Subelement forms a power grid background harmonics analog module, and the output end of all power grid background harmonics analog modules passes through branch
Breaker is connected in parallel, and accesses the input terminal of different test equipments.
Further, main control unit controls each power grid background harmonics analog module according to the capacity of test equipment
Output.
Further, main control unit and each power grid background harmonics analog module carry out two-way communication, when single power grid
After background harmonics analog module breaks down, operation is automatically exited from, remaining power grid background harmonics analog module is according to load capacity
It is automatic to divide equally output.
Further, the full-controlled rectifier unit and harmonic voltage generating unit are using isolated PWM rectification and PWM inversion
Two Stages structure module structure, by the cascade number of extended power module come expansion instrument capacity.
Further, each described full-controlled rectifier subelement is connect by breaker with ac input end；The full control
The input terminal parallel connection RC high-frequency absorber for rectifying subelement, is then sequentially connected in series buffer resistance and input reactance device is followed by
Enter active rectification feedback current transformer, alternating voltage is converted into controllable DC voltage by active rectification feedback current transformer；Institute
State the output end connection harmonic voltage generating unit of active rectification feedback current transformer.
Further, the output end DC bus of each full-controlled rectifier subelement is mutually indepedent；DC bus electricity
Pressure is maintained by the energy-storage capacitor that DC bus supports, and two energy-storage capacitor series connection are followed by the both ends of DC bus.
Further, the storage capacitor that subelement input terminal connects two series connections occurs for each described harmonic voltage
Device is connected to the both ends of DC bus after the energy-storage capacitor series connection；Then DC bus access simulation inverter, the mould
After the output end of quasi- inverter is sequentially connected in series reactor and buffer resistance, RC high-frequency absorber in parallel.
In further embodiments, it adopts the following technical scheme that
A kind of control method of modularization power grid background harmonics simulator, comprising:
Main control unit sets power grid background harmonic voltage data parameters information based on the received and generates background harmonic voltage control
System instruction, and it is sent to harmonic voltage generating unit；Harmonic voltage generating unit generates corresponding according to the control instruction received
Background harmonic voltage；
Command and control unit receives the output signal of harmonic voltage generating unit feedback, and the power grid background harmonic voltage with setting
Data parameters information is compared, and is adjusted according to the difference of the two to background harmonic voltage control instruction.
Compared with prior art, the beneficial effects of the present invention are:
1) present invention is for simulating partial electric grid background harmonic voltage, for tested equipment dynamic detection provide in high precision,
Intelligentized power grid background harmonic voltage.
2) multiple power grid background harmonics analog module parallel redundancy designs, rated capacity is up to MW class.It is set according to detection
Standby capacity rationally controls the output of each module, and output capacity is adjustable online, improves detection accuracy, reality output and setting
Error≤1% between output；Unit module failure does not influence system operation.
3) harmonic voltage generating unit output is adjusted using closed-loop feed-back type, can accurately correct harmonic voltage generating unit
Input parameter, active accommodation DC bus operating voltage, Protection parameters setting and monitoring control harmonic wave of output voltage content, humorous
Wave characteristic number.
4) parameter is arranged by host computer in Digital Control, and it is (common humorous containing laboratory to may be programmed 0~51 any harmonic wave
Involve atypical harmonic wave), harmonic wave range difference is adjustable.
5) using the Two Stages framework of isolated PWM rectification and PWM inversion, output is isolated with power grid, prevents high frequency from infusing
Enter to influence power grid, harmonic pollution not will cause to power grid.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the modularization power grid background harmonics simulator structural schematic diagram in embodiment one；
Fig. 2 is the modularization power grid background harmonics simulator circuit diagram in embodiment one；
Fig. 3 is the voltage magnitude and control method for frequency flow chart in embodiment one；
Fig. 4 is the display power grid background harmonics programming interface in embodiment one；
Fig. 5 is the programmable power grid background harmonic voltage preview waveform in embodiment one；
Fig. 6 is the output power grid background harmonic voltage waveform in embodiment one；
Fig. 7 is the typical 20% voltage distortion rate waveform of programmable three-phase in embodiment one；
Fig. 8 is the power cell parallel redundancy output waveform in embodiment one.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms that the present invention uses have logical with the application person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Embodiment one
In one or more embodiments, a kind of modularization power grid background harmonics simulator is proposed, such as Fig. 1 institute
Show, including main control unit, full-controlled rectifier unit, harmonic voltage generating unit, host computer and auxiliary power unit are constituted.
Main control unit is connected with host computer, and host computer can connect remote monitoring platform, and main control unit receives host computer or remote
The data parameters for the power grid background harmonic voltage waveform that the experiment that range monitoring platform issues needs.Host computer and remote monitoring platform
It can mutual switch operating；The upper direct transmitting order to lower levels of function；Remote monitoring platform also can transmitting order to lower levels to host computer, host computer is again
Transmitting order to lower levels is to main control unit.
Main control unit connects full-controlled rectifier unit and harmonic voltage generating unit, harmonious by optical fiber and full-controlled rectifier unit
The communication of wave voltage generating unit.
The controller of full-controlled rectifier unit is connect by optical fiber with main control unit, controls each full-controlled rectifier by main control unit
The working condition of unit, adjusts stable DC bus operating voltage, the working condition of real-time monitoring rectification unit, and input side uses
SPWM rectifier system reduces pollution of the harmonic wave to power grid.
Main control unit controls harmonic voltage generating unit by optical fiber, instructs voltage operational in main control unit digital processing unit
Command signal is formed, is issued to each harmonic voltage generating unit controller, harmonic voltage generating unit controller is according to master control
The command signal that device processed issues, by calculating the harmonic wave electricity for generating driving instruction and controlling harmonic voltage generating unit generation needs
Pressure.Outlet side is fed back by Hall voltage sampled signal to main control unit, forms closed loop feedback, while main control unit passes signal
It is defeated by host computer or remote monitoring platform, is finely adjusted according to setup parameter and reality output parameter difference, guarantees output accuracy
It is required that.Voltage harmonics number 0-51 times of main control unit generation, low-frequency harmonics and m-Acetyl chlorophosphonazo can be added arbitrarily, and harmonic content is
Arbitrary proportion in 0% to 100%.
As shown in Fig. 2, full-controlled rectifier unit and harmonic voltage generating unit are using isolated PWM rectification and PWM inversion
Two Stages structure module structure, by the cascade number of extended power module come expansion instrument capacity.
PWM, which is rectified, to be connected between outlet side and PWM inversion input side by DC voltage, and whole device input is three intersections
Galvanic electricity pressure, output are three-phase alternating voltage, when any background harmonic voltage is simulated in device output, due to inputting, exporting by straight
Stream separates, and will not influence input side voltage waveform, and rectification side and inversion Chengdu use Modular Structure Design.It therefore is isolated two
Grade transform framework modular construction.
Modularization power grid background harmonics simulator different capacity capacity is made of the power cell parallel connection of different groups of numbers, is lifted
Example: 100kVA device is made of the Two Stages structure module of 1 group of isolated PWM rectification and PWM inversion, and 300kVA device is by 3
The Two Stages structure module of group isolated PWM rectification and PWM inversion is constituted, and realizes increase-volume by parallel module, every group straight
It is mutually indepedent to flow bus, is independent of each other between group and group；Capacity distribution is controlled by main control unit.
Full-controlled rectifier unit includes several full-controlled rectifier subelements being connected in parallel, and harmonic voltage generating unit includes several
Subelement occurs for harmonic voltage, each full-controlled rectifier subelement connects a harmonic voltage and subelement one power grid of composition occurs
The output end of background harmonics analog module, all power grid background harmonics analog modules is connected in parallel by branch circuit breaker,
Access the input terminal of different test equipments.
Main control unit controls the output of each power grid background harmonics analog module according to the capacity of test equipment.Master control
Unit and each power grid background harmonics analog module carry out two-way communication, when event occurs in single power grid background harmonics analog module
After barrier, operation is automatically exited from, remaining power grid background harmonics analog module is divided equally automatically according to load capacity to be exported.
Power grid background harmonics analog module is run using multiple module paralleling mode, needs detection device capacity when according to test
Size, host computer or remote monitoring platform issue instruction, provide actual act signal by main control unit, control every group of harmonic wave electricity
Generating unit output is pressed, different capabilities demand is met.Using independent auxiliary power supply system, provided for main control unit and host computer
Reliable power supply.
Referring to Fig. 2, device input side is connected by breaker with power grid, is then followed successively by full-controlled rectifier unit, harmonic wave electricity
Generating unit is pressed to export breaker.Full-controlled rectifier unit input terminal parallel connection RC high-frequency absorber, by buffer resistance and input
Reactor is connected, and avoids contact with device band and carries impact of the on-off to device and equipment；Output end accesses active rectification feedback unsteady flow
Alternating voltage is converted into controllable DC voltage by device, active rectification feedback current transformer, and three-phase ac contactor control is actively
The connecting and disconnecting of the circuit of formula rectification feedback current transformer front end；Active rectification feedback current transformer output connects the mould of harmonic voltage generating unit
Quasi- inverter, DC bus-bar voltage are maintained by the energy-storage capacitor that DC bus supports, DC bus Support Capacitor two series connection,
Its midpoint of connecting is the middle line N that each group simulates inverter, and DC bus is positive and negative to be connected with simulation inverter assembly direct current input；Respectively
The DC bus of power grid background harmonics analog module is mutually indepedent, controls DC bus operating voltage, mould respectively by main control unit
Quasi- inverter exports individual RC High frequency filter absorbing circuit.Each power grid background harmonics analog module output end passes through branch's open circuit
Device is connected in parallel, and accesses the input terminal of different detection devices, and simulating grid background state realizes partial electric grid simulated environment,
Detection device is tested.
Harmonic voltage generating unit output voltage Hall detects signal and output current transformer detection signal feedback to master
The input terminal of the command voltage arithmetic element in unit is controlled, the accurate input parameter for correcting harmonic voltage generating unit is actively adjusted
Whole DC bus operating voltage, Protection parameters setting and monitoring control harmonic wave of output voltage content, harmonic characteristic number, master control list
The command signal of member is transferred in each harmonic voltage generating unit by optical fiber, and the instruction issued is occurred single by harmonic voltage
The controller of member generates driving signal control simulation inverter switching device, generates the background harmonic voltage of needs.
Need any power grid background harmonic voltage to be simulated can be edited with waveform customization by host computer, it is right
Three-phase voltage carries out data initialization, is programmed according to the voltage magnitude of test, phase, reference frequency to fundamental wave, then right
The harmonics needed are programmed.Waveform preview, the finger that main control unit is issued according to host computer can be carried out in host computer
It enables and carries out operation, obtain the power grid background harmonic voltage that SPWM voltage pulse width signal goes driving IGBT to generate setting.
Embodiment two
In one or more embodiments, a kind of controlling party of modularization power grid background harmonics simulator is proposed
Method, comprising the following steps:
(1) for network voltage successively by input breaker, full-controlled rectifier unit, full-controlled rectifier unit converts alternating voltage
At controllable DC voltage, it is connected with harmonic voltage generating unit DC side；
(2) harmonic characteristic of power grid background harmonics needed for main control unit connects the experiment that host computer or remote monitoring platform issue
The call parameters such as secondary and harmonic content；
(3) digital processing unit in main control unit forms command signal according to command voltage operation, is issued to each harmonic wave
Voltage generating unit controller, the command signal that harmonic voltage generating unit controller is issued according to master controller pass through calculating
It generates driving instruction control harmonic voltage generating unit and generates the harmonic voltage needed, generate synchronization signal by data processing,
To drive harmonic voltage generating unit to generate background harmonic voltage waveform；
(4) harmonic voltage generating unit outlet side voltage Hall detection signal and output current transformer detection signal feedback
The input terminal of command voltage arithmetic element into main control unit, the accurate input parameter for correcting harmonic voltage generating unit are main
Dynamic adjustment DC bus operating voltage, background harmonic voltage feature time, aberration rate size, Protection parameters setting and monitoring.
Various differences can produce by controlling the amplitude and phase of voltage for any power grid background harmonic voltage source
The voltage source of demand.It is made of at voltage fundamental voltage and each harmonic voltage analog-to-digital conversion.
Actual waveform is passed through into fast Fourier transform fft analysis,It can divide
Solution is at using reference frequency as the harmonic voltage of cardinal sum reference frequency integral multiple, n times of highest of harmonic voltage of composition.
In formula, ω1For the angular frequency of benchmark frequency, unit rad/s；H is overtone order；uhFor h subharmonic voltage
Root-mean-square value, unit A；βhGo out phase angle, unit rad for h subharmonic voltage；N is the harmonic wave highest number considered, root
It is determined according to power grid background harmonic voltage source highest number needed for testing.
Data are decomposed into Uxa0, Uya0, Uxal, Uya1......Uxan, Uyan；Uxb0, Uyb0, Uxb1,
Uyb1......Uxbn, Uybn；Uxc0, Uyc0, Uxc1, Uyc1......Uxcn, Uycn；Each harmonic frequency, amplitude, phase
Then position carries out amplitude normalization to its amplitude, phase and summarizes.It is set with mould Ran and phase angle α, needs to be converted to rectangular co-ordinate
Ux, Uy of system.Pass through following calculation formula:
A phase:
B phase:
C phase:
1 background harmonic voltage polar coordinates of table and the rectangular co-ordinate table of comparisons
According to n times of reference frequency (n is positive integer), the superposition of the sine wave of different frequency is split into, by fractionation
Each harmonic voltage carries out amplitude and phase change, and numerical value normalization carries out the reduction of N point data, N within a primitive period
For the natural number greater than 0, N is bigger, and calculated result is more accurate, changes reference voltage, each harmonic voltage magnitude, phase value respectively.
Each secondary voltage harmonic of table 2 programs table
| Overtone order | Amplitude | Angle | Radian | 0 | 1 | 2 | 3 | 4 | 5 | 6 | . | . | N |
| 1 | |||||||||||||
| 2 | |||||||||||||
| . | |||||||||||||
| . | |||||||||||||
| 5 |
By being configured to the adjustment of each harmonic voltage magnitude and each harmonic phase angle, it can satisfy different tests and want
The background harmonic voltage asked distorts, the secondary demand of feature.
As shown in figure 3, main control unit according to the power grid background harmonic voltage virtual value set in host computer man-machine interface and
The voltage effective value of systematic sampling feedback does subtraction, is then adjusted by PI and generates an amplitude signal；When setting output services
When frequency is consistent with input service frequency, output voltage is by phase locking unit and input voltage locking phase, by the work of instruction and setting
Frequency signal gives the sine wave generated in key player on a team's wave table together, and actual waveform is split by sine wave table, and U (t)=U ×
sin(2πf/n)；
The sine wave in a cycle is subjected to 2048 points of fractionation according to sine wave table；The instruction letter that sine wave table generates
Number and PI adjust the amplitude signal generated and carry out operation, the signal of operation result and voltage transient feedback does subtraction, then passes through
PI, which is adjusted, generates an amplitude signal, obtains SPWM voltage pulse width signal with the progress operation of the first preset ratio COEFFICIENT K and goes to drive
IGBT generates the power grid background harmonic voltage of setting.
As shown in figure 4, host computer can by waveform customization, to need any power grid background harmonic voltage to be simulated into
Edlin carries out data initialization to three-phase voltage, is compiled according to the voltage magnitude of test, phase, reference frequency to fundamental wave
Then journey is programmed the harmonics of needs, the control method that may be programmed power grid background harmonics simulator carries out width
Value normalization.As shown in figure 5, can carry out waveform preview in host computer, main control unit is carried out according to the instruction that host computer issues
Operation obtains SPWM voltage pulse width signal and driving IGBT is gone to generate the power grid background harmonic voltage of setting, is illustrated in figure 6 output
Power grid background harmonic voltage waveform, Fig. 7 are the typical 20% voltage distortion rate waveform of three-phase.
Main control unit and each harmonics generation unit both-way communication automatically exit from operation after single module breaks down,
Complementary modul root tuber is divided equally automatically according to load capacity, and guarantee test is unaffected.As shown in figure 8,1 is output voltage, 2 is defeated for single module
Electric current out, 3 be total output electric current, after single module failure is exited and put into operation, is not influenced for 1 and 3.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of modularization power grid background harmonics simulator characterized by comprising main control unit, full-controlled rectifier unit, humorous
Wave voltage generating unit and host computer；The main control unit and full-controlled rectifier unit, harmonic voltage generating unit and host computer point
It does not connect；Ac input end is sequentially connected in series full-controlled rectifier unit and harmonic voltage generating unit；
Main control unit receives the power grid background harmonic voltage data parameters information that host computer is sent, and is sent out according to the information received
Control instruction out, control harmonic voltage generating unit generate corresponding background harmonic voltage；The output of harmonic voltage generating unit is surveyed
Hall voltage sampled signal feedback to main control unit, main control unit adjusts control instruction according to the feedback signal received
It is whole.
2. a kind of modularization power grid background harmonics simulator as described in claim 1, which is characterized in that the host computer with
Remote monitoring platform connection sends power grid background harmonic voltage data parameters information to host computer by remote monitoring platform, on
The information received is sent to main control unit by position machine；Alternatively, remote monitoring platform directly sends power grid background to main control unit
Harmonic voltage data parameters information.
3. a kind of modularization power grid background harmonics simulator as described in claim 1, which is characterized in that the full-controlled rectifier
Unit includes several full-controlled rectifier subelements being connected in parallel, and the harmonic voltage generating unit includes that several harmonic voltages occur
Subelement, each full-controlled rectifier subelement connect a harmonic voltage and the one power grid background harmonics simulation of subelement composition occur
The output end of module, all power grid background harmonics analog modules is connected in parallel by branch circuit breaker, accesses different tests
The input terminal of equipment.
4. a kind of modularization power grid background harmonics simulator as claimed in claim 3, which is characterized in that main control unit according to
The capacity of test equipment controls the output of each power grid background harmonics analog module.
5. a kind of modularization power grid background harmonics simulator as claimed in claim 3, which is characterized in that main control unit and every
One power grid background harmonics analog module carries out two-way communication, after single power grid background harmonics analog module breaks down, from
Move it is out of service, remaining power grid background harmonics analog module according to load capacity automatically divide equally export.
6. a kind of modularization power grid background harmonics simulator as described in claim 1, which is characterized in that the full-controlled rectifier
Unit and harmonic voltage generating unit are passed through using the Two Stages structure module structure of isolated PWM rectification and PWM inversion
The cascade number of extended power module carrys out expansion instrument capacity.
7. a kind of modularization power grid background harmonics simulator as described in claim 1, which is characterized in that each is described complete
Control rectification subelement is connect by breaker with ac input end；The input terminal parallel connection RC high frequency of the full-controlled rectifier subelement is inhaled
Receiving apparatus, is then sequentially connected in series buffer resistance and input reactance device is followed by into active rectification feedback current transformer, active
Alternating voltage is converted into controllable DC voltage by rectification feedback current transformer；The output end of the active rectification feedback current transformer
Connect harmonic voltage generating unit.
8. a kind of modularization power grid background harmonics simulator as claimed in claim 7, which is characterized in that each is described complete
The output end DC bus of control rectification subelement is mutually indepedent；DC bus-bar voltage is tieed up by the energy-storage capacitor that DC bus supports
It holds, two energy-storage capacitor series connection are followed by the both ends of DC bus.
9. a kind of modularization power grid background harmonics simulator as claimed in claim 7, which is characterized in that described each is humorous
The energy-storage capacitor that subelement input terminal connects two series connections occurs for wave voltage, is connected to after the energy-storage capacitor series connection
The both ends of DC bus；Then the output end of DC bus access simulation inverter, the simulation inverter is sequentially connected in series reactance
After device and buffer resistance, RC high-frequency absorber in parallel.
10. a kind of control method of modularization power grid background harmonics simulator characterized by comprising
Main control unit, which sets power grid background harmonic voltage data parameters information based on the received and generates background harmonic voltage and control, to be referred to
It enables, and is sent to harmonic voltage generating unit；Harmonic voltage generating unit generates corresponding back according to the control instruction received
Scape harmonic voltage；
Command and control unit receives the output signal of harmonic voltage generating unit feedback, and the power grid background harmonic voltage data with setting
Parameter information is compared, and is adjusted according to the difference of the two to background harmonic voltage control instruction.
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| CN110829412A (en) * | 2019-10-25 | 2020-02-21 | 山东华天电气有限公司 | Modularized programmable power grid line impedance simulation device and control method thereof |
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| CN110829412B (en) * | 2019-10-25 | 2021-03-23 | 山东华天电气有限公司 | Modularized programmable power grid line impedance simulation device and control method thereof |
| CN117783757A (en) * | 2024-02-23 | 2024-03-29 | 山东华天电气有限公司 | Modularized simulation device and control method thereof |
| CN117783757B (en) * | 2024-02-23 | 2024-05-14 | 山东华天电气有限公司 | Modularized simulation device and control method thereof |
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