CN107230975A - A kind of grid stimulating device - Google Patents
A kind of grid stimulating device Download PDFInfo
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- CN107230975A CN107230975A CN201610170440.0A CN201610170440A CN107230975A CN 107230975 A CN107230975 A CN 107230975A CN 201610170440 A CN201610170440 A CN 201610170440A CN 107230975 A CN107230975 A CN 107230975A
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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
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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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Abstract
The present invention relates to a kind of grid stimulating device, mainly it is made up of, has real-timedigital simulation module, signal modulator, power amplifier, wave filter and the part of sampling feedback module five：Amplification efficiency greatly improved, the problem of RTDS can not simulate Large Copacity power network is solved；Switching frequency greatly improved, effectively the harmonic wave in simulation actual electric network within 50kHz, frequency response range is wide, for falling, the simulation of higher hamonic wave power network form it is true to nature；The requirement of L, C parameter is reduced, the design of wave filter is simplified, the volume of wave filter is reduced；Three phase power amplifier is built to be more prone to；The device conveniently can improve output voltage by application step-up transformer, and power output is improved by power amplifier chips in parallel, effectively overcome limitation of the digital power amplifier chip to output voltage and power, the convenient various form power networks of simulation；Simulating grid special operation condition can be facilitated；Frequency response range is wide, for falling, the phenomena simulation such as higher hamonic wave it is true to nature.
Description
Technical field
The invention belongs to power condition simulation field, especially a kind of grid stimulating device.
Background technology
In research distributed power generation unit, current transformer and when influencing each other of power network, it is often necessary to which it is special that power network is in some
Under different operating mode, such as Voltage Drop, three-phase imbalance, frequency fluctuation, containing background harmonicses.For actual experiment system
System, is difficult often actual electric network above-mentioned situation is occurred, this just gives distributed power generation unit, unsteady flow due to the particularity of power network
The research that influences each other of device and power network brings inconvenience.
When research object include power network when, the selection power system simulation software that we can be accustomed to, such as matlab, RTDS,
PSASP etc..But the result that software emulation is obtained, tends not to enough accurate response actual conditions.Simulation result is commonly used for qualitative
Analysis, and can not quantitatively study a question.On the other hand, if we are tested with material object, this cost is huge.Especially
It is related to huge power system, unrealistic, the particularly simulation of power system special operation condition of experiment is done to power system.
The device, which is connected with actual loading and current transformer or is connected with hardware-in-the-loop simulation device, can simulate a variety of power network forms,
With influencing each other between quantitative study power network and grid-connected converter or load, software present in current research process is solved
The problem of simulation accuracy is poor, actual electric network experimentation cost is expensive.
The content of the invention
Such as the description in background technology, faced with this situation, a kind of grid stimulating device can be designed, by simulating grid with
Actual loading and current transformer are connected to together.Realize the simulation of various power network special operation conditions.The power system enriched in view of RTDS
Model library and real-time, can realize and be connected with extraneous material object, be adapted to do power network simulation.But actual experiment is confirmed, RTDS power
Fan-out capability is very low, it is impossible to meet the requirement of simulation Large Copacity power network.Need to amplify output signal using power amplifier.Can
To be considered as A class push-pull power amplifiers, but A class power amplifier caloric values are surprising, and in order to effectively handle heat dissipation problem, A class power amplifiers are necessary
Using big heat sink, and efficiency is low.D class power amplifications（Digital power amplifier）Operation principle somewhat similar switch voltage-stabilizing electricity
Source, it is by controlling the switch of power tube (on/off) to be changed to obtain power.Although switching tube conducting when electric current most
Greatly, but tube voltage drop is but very low.Although voltage is maximum in cut-off, electric current is equal to zero.The efficiency of usual D classes amplification is reachable
90%~95%.Digital power amplifier technology is widely used in stereo set, mainly carries out power amplification to audio signal.Digital work(
The switching frequency at least 200KHz of chip is put, is the audiorange that human ear is heard（20Hz~20KHz）More than 10 times.Can be with
Reappear harmonic wave within the 50kHz in power network well.
The present invention provides a kind of grid stimulating device for being used to simulate variform, and the device can be with actual loading and change
Stream device is connected to together, can be also connected with hardware-in-the-loop simulation device, for studying the mutual of power network and grid-connected converter or load
Influence.
The present invention provides a kind of grid stimulating device, it is characterized in that, mainly by real-timedigital simulation module, signal modulation
Device, power amplifier, wave filter and the part of sampling feedback module five composition, real-timedigital simulation Module connection signal modulator,
Signal modulator connects power amplifier, power amplifier connection wave filter, wave filter connection sampling feedback module, sampling feedback
Module connects real-timedigital simulation module, wave filter output analog signal；Real-timedigital simulation module is used to setting up and emulating electricity
Pessimistic concurrency control, produces sinusoidal signal；Power amplifier uses the digital power amplifier chip of application digital power amplifier technology, is amplified using two-stage
Form, the first order, which is amplified, is converted into amplitude relatively low sinusoidal signal by signal modulator 5V pwm signal, second level amplification by
The PWM waveform of the first order is carried out amplitude and power amplification by power amplifier, and its mode signal output is used
Bridge-tied load BTL（Bridge Tied load）, with two power amplifier output ends, the output of a power amplifier is that another is defeated
Go out the mirror image at end, two output waveforms differ 180 ° in phase, and amplitude is twice of Single-end output waveform；Wave filter uses LCL
Topological structure, for filtering out higher hamonic wave, it is ensured that waveform is undistorted and does not introduce harmonic wave to power network；Sampling feedback module is used to adopt
Collect filter output signal, and fed back to the AD collection terminals of real-timedigital simulation module, system formation closed loop is eliminated and missed
Difference.
Grid stimulating device of the present invention is used for the power network for simulating variform, such as Voltage Drop, three-phase imbalance, frequency wave
Move.RTDS simulation softwares and material object are connected to together by it, with reliable HWIL simulation function；Utilize real-timedigital simulation
Module（RTDS）Set up and simulated grid model, export voltage, the current waveform of certain node, ripple is amplified through external power amplifier
The amplitude and power of shape, it is ensured that waveform is undistorted and does not introduce harmonic wave to power network, while can increase feedback element as needed.
Further, grid stimulating device mainly includes RTDS and power amplifier, and RTDS can be from the electricity approved in the industry
Force system simulation software or controller, the latter are the power amplifiers of independent development, and the power amplifier uses digital power amplifier
Technology, its core is digital power amplifier chip, and its switching frequency is up to 300kHz.
Further, power amplifier uses two-stage form, and the first order believes the PWM that the RTDS sine waves exported are changed into 5V
Number, the second level is using PWM waveform as drive signal, and the digital power amplifier chips of driving export PWM.The way of output uses bridge-tied load
BTL（Bridge Tied load）, the doubleway output that 180 ° of mutual deviation, the voltage finally given is twice of original Single-end output.
Further, the power amplifier is for actual electric network, it is considered to which the scope of mains by harmonics is general within 10KHz,
And the switching frequency of digital power amplifier chip is up to 300KHz, for the former 30 times；Therefore, the harmonic wave that the device is introduced can be neglected.
300kHz switching frequencies are relied on simultaneously, and the design of low pass filter is just very simple, and the requirement to LC parameters is very low, wave filter
Volume it is also smaller.Wave filter uses LCL structures, specifically refers to accompanying drawing 6.
Further, described power amplifier, factor word power amplifier chips dispersiveness very little, different digital power amplifier chip is defeated
Enter identical waveform, the waveform after filtering output is almost consistent, therefore, three uniphase amplifier parallel connections build three phase power amplification
Device, also can improve power grade by power amplifier chips in parallel.
Further, the power amplifier, its output voltage and power are limited by digital power amplifier chip, except passing through
Power amplifier chips in parallel improve power grade, also can select step-up transformer and improve output voltage.
Real-timedigital simulation module english abbreviation of the present invention is RTDS.
What the present invention was brought has the technical effect that：
1st, the device uses the power amplifier of application digital power amplifier technology chip, and amplification efficiency greatly improved, solves
The problem of RTDS can not simulate Large Copacity power network.
2nd, the device uses the power amplifier of application digital power amplifier technology chip, and switching frequency greatly improved, can
Harmonic wave effectively in simulation actual electric network within 50kHz, frequency response range is wider, for falling, the power network shape such as higher hamonic wave
The simulation of state is more life-like.
3rd, the device uses the power amplifier of application digital power amplifier technology chip, reduces the requirement of L, C parameter, simplifies
The design of wave filter, reduces the volume of wave filter.
4th, the device uses the power amplifier of application digital power amplifier technology chip, because its consistency is good, builds three-phase
Power amplifier is more prone to.
5th, the device conveniently can improve output voltage by application step-up transformer, and output work is improved by power amplifier chips in parallel
Rate, effectively overcomes limitation of the digital power amplifier chip to output voltage and power, can conveniently simulate various form power networks.
6th, simulating grid special operation condition can be facilitated.
7th, frequency response range is wide, for falling, the phenomena simulation such as higher hamonic wave it is true to nature.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram；
Fig. 2 is TPA2000 circuit diagrams of the present invention；
Fig. 3 is TAS5261 circuit diagrams of the present invention；
Fig. 4 is TAS5261 power outputs of the present invention and load and the graph of a relation of voltage；
Fig. 5 is wave filter LCL topological structure circuit diagrams of the present invention；
Fig. 6 is the theory diagram of the embodiment of the present invention 2；
In figure：1 is real-timedigital simulation module；2 be signal modulator；3 be power amplifier；4 be wave filter；5 is anti-for sampling
Present module.
Embodiment
1-5, is described in more detail the implementation of the present invention referring to the drawings.
Embodiment 1
The present invention provides a kind of grid stimulating device, mainly by real-timedigital simulation module 1, signal modulator 2, power amplifier
3rd, wave filter 4 and the part of sampling feedback module 5 five composition, the connection signal modulator 2 of real-timedigital simulation module 1, signal modulation
Device 2 connects power amplifier 3, the connection wave filter 4 of power amplifier 3, the connection sampling feedback of wave filter 4 module 5, sampling feedback mould
The connection real-timedigital simulation of block 5 module 1, the output analog signal of wave filter 4；Real-timedigital simulation module 1 is used to set up and emulate
Electric network model, produces sinusoidal signal；Power amplifier 3 is using the digital power amplifier chip using digital power amplifier technology, using two-stage
Amplification form, the first order amplifies the pwm signal that the relatively low sinusoidal signal of amplitude is converted into 5V by signal modulator 2, the second level
Amplification carries out amplitude and power amplification, its output side signal by power amplifier 3 using the PWM waveform of the first order as drive signal
Formula uses bridge-tied load BTL（Bridge Tied load）, with two power amplifier output ends, the output of a power amplifier is in addition
The mirror image of one output end, two output waveforms differ 180 ° in phase, and amplitude is twice of Single-end output waveform；Wave filter 4
Using LCL topological structures, for filtering out higher hamonic wave, it is ensured that waveform is undistorted and does not introduce harmonic wave to power network；Sampling feedback mould
Block 5 is used to gather the output signal of wave filter 4, and is fed back to the AD collection terminals of real-timedigital simulation module 1, and system formation is closed
Ring, eliminates error.
Grid stimulating device of the present invention is used for the power network for simulating variform, such as Voltage Drop, three-phase imbalance, frequency wave
Move.RTDS simulation softwares and material object are connected to together by it, with reliable HWIL simulation function；Utilize real-timedigital simulation
Module（RTDS）Set up and simulated grid model, export voltage, the current waveform of certain node, ripple is amplified through external power amplifier
The amplitude and power of shape, it is ensured that waveform is undistorted and does not introduce harmonic wave to power network, while can increase feedback element as needed.
Further, grid stimulating device mainly includes RTDS and power amplifier, and RTDS can be from the electricity approved in the industry
Force system simulation software or controller, the latter are the power amplifiers of independent development, and the power amplifier uses digital power amplifier
Technology, its core is digital power amplifier chip, and its switching frequency is up to 300kHz.
Further, power amplifier uses two-stage form, and the first order believes the PWM that the RTDS sine waves exported are changed into 5V
Number, the second level is using PWM waveform as drive signal, and the digital power amplifier chips of driving export PWM.The way of output uses bridge-tied load
BTL（Bridge Tied load）, the doubleway output that 180 ° of mutual deviation, the voltage finally given is twice of original Single-end output.
Further, the power amplifier is for actual electric network, it is considered to which the scope of mains by harmonics is general within 10KHz,
And the switching frequency of digital power amplifier chip is up to 300KHz, for the former 30 times；Therefore, the harmonic wave that the device is introduced can be neglected.
300kHz switching frequencies are relied on simultaneously, and the design of low pass filter is just very simple, and the requirement to LC parameters is very low, wave filter
Volume it is also smaller.Wave filter uses LCL structures, specifically refers to accompanying drawing 6.
Further, described power amplifier, factor word power amplifier chips dispersiveness very little, different digital power amplifier chip is defeated
Enter identical waveform, the waveform after filtering output is almost consistent, therefore, three uniphase amplifier parallel connections build three phase power amplification
Device, also can improve power grade by power amplifier chips in parallel.
Further, the power amplifier, its output voltage and power are limited by digital power amplifier chip, except passing through
Power amplifier chips in parallel improve power grade, also can select step-up transformer and improve output voltage.
Real-timedigital simulation module（RTDS）For conventional power system simulation software, it has abundant power system mould
Type storehouse and real-time, can realize and be connected with extraneous material object, be adapted to do power network simulation.
Power amplifier one-level power amplifier（Power amplifier is modulated）From TPA20000 chips, the chip can become sinusoidal signal
Pwm signal, output amplitude is 5V, and power is 2W.Compared with former product, the product supply voltage is lower, and noise is smaller, efficiency
It is higher.
Power amplifier second level power amplifier（Power amplifier amplifies）Using the TAS5261 digital power amplifier chips of independent development, the core
Piece is a kind of high-performance, integrated, low harmony wave loss monophonic digital power amplifier chips, and its size is only 16 × 11 × 3.5mm,
Its circuit design is simple, it is only necessary to which a simple demodulator filter circuit can be achieved with high-quality, efficient sound amplification, energy
Realize in single-phase 300W output, output single-phase voltage peak 50V and can adjust, peak-to-peak value is 100V, and frequency can in audiorange
Regulation.Power switch frequency uses 300KHz, and high-quality three-phase electricity is can be obtained by using less inductance, capacitor filtering
Source.Amplification efficiency and switching frequency greatly improved in this chip, solves the problem of RTDS can not simulate Large Copacity power network, can be square
Just various power network forms are simulated.
In the hardware system of analog amplifier, first order power amplifier modulator zone selects TPA20000, and the chip can be by sinusoidal signal
Become pwm signal, output amplitude is 5V power 2W.Second level power amplifier amplification region uses TAS5261 digital power amplifier chips, it big
It is small be only 16X11X3.5mm, but can realize in single-phase 300W output, output single-phase voltage peak 50V can adjust, peak-to-peak value is
100V, frequency is adjustable in audiorange.Power switch frequency uses 300KHz, can using less inductance, capacitor filtering
To obtain high-quality three phase mains.
Used in Fig. 2 because TPA2000 chips are designed as single supply low-voltage, efferent duct uses BTL connections.Control signal
Make two output ends OUT+ and OUT- --- phase difference 180.Using dutycycle mode modulating audio frequency, dutycycle is during no signal
50%, the highest amplitude of each waveform is 5V.BTL is output as both differences, therefore output voltage can rise to V_pp=10V.But
The average current and average voltage of output are all zero, are not exported still.If the output signal dutycycle of two output ends is differed,
Both, which subtract each other, just has component of signal appearance.It follows that the difference of output signal pwm signal known to us.
Wave filter shown in Fig. 5 uses LCL topological structures, is mainly used in filtering out higher hamonic wave, it is ensured that waveform is undistorted and not
Harmonic wave is introduced to power network.
TPA2000 is the low power supply class-D amplifier of the third generation that American TI Company is released.The supply voltage compared with former product
It is lower, background noise is lower, efficiency is higher.TPA2000 is powered using 5V single supplies, in R_L=3 Ω, is output as 2W, now
THD≤0.4%.When using 4 Ω loads instead, when 1W is exported, THD+N during 1kHz input signals is less than 0.08%.In order to improve low electricity
Switch power output during pressure, circuit uses BTL connections, thus input can be directly accessed balanced input signal.The chip
Output low pass filter can not be connect, and using, this not only facilitates user, also reduces the cost of whole amplifier.Here we will be defeated
The pwm signal gone out will not take filtering as the drive signal of subordinate.
TAS5261 is high-performance, integrated, low harmony wave loss monophonic digital power amplifier, can be used to drive 4 Ω to 8 Ω
Loudspeaker.Circuit design is simple, it is only necessary to which a simple demodulator filter circuit can be achieved with high-quality, efficient sound
Amplification.TAS5261 is integrated with perfect protection circuit, comes protection equipment and loudspeaker damage.Protection feature includes short circuit
Protection, overcurrent protection, voltage protection and input signal PWM lose protection.These protections can be selected as needed.Its output
Power：8 Ω are loaded, when harmonic wave total amount is less than 0.09%, 50V DC voltages, export 125W；6 Ω are loaded, during harmonic wave total amount 10%,
During 50V DC voltages, 220W is exported；4 Ω are loaded, during harmonic wave total amount 10%, during 50V DC voltages, export 315W.
In order to simplify system design, TAS5261 only needs 12V and 50V power supply.Internal voltage regulator is
Digital circuit and low-voltage simulation circuit with stable power supply.Note, all circuits need the power supply on a floating ground.The gate pole of flash
Driving, is provided by the boostrap circuit built by a small amount of peripheral components.
To show the characteristic of outstanding electricity and sound, the pwm signal comprising gate-drive and output stage is designed to allusion quotation
Two isolated half-bridges of type.Therefore, each half-bridge has independent gate-drive power supply, boostrap circuit and external power source.Further, it is attached
Plus pin VDD be used as the power supply of inner most circuit.Although power supply both is from identical 12V power supplys, pass through RC
Wave filter preferably separates GVDD_X and VDD.These RC wave filters provide good isolation.It is specifically intended that will go
Coupling electric capacity is as close to the pin being connected with it.The distributed inductance between power pin and decoupling capacitor must be avoided.
12V power supply should select low noise, the power supply of low input impedance.Equally, 50V power supply also should be as
This.Internal electrification reset circuit eliminates the electric sequence of power supply.Further, TAS5261 can be protected due to the parasitic electricity of gate pole
Failure caused by lotus.Therefore, the rate of change of voltage need not consider in a specific range.
Sampling feedback module 5 is mainly used in gathering output signal, and signal is fed back to RTDS AD collection terminals, system shape
Into closed loop, to eliminate error.
Embodiment 2
Grid stimulating device as described in Example 1, RTDS is replaced using controller, and controller produces three-phase by the program of writing
Pwm signal, control inverter bridge conducting, produce amplitude be 0V to the PWM ripple signals of supply voltage, filtered out by LC low pass filters
Higher harmonic components.Now, controller needs to write SPWM algorithms or SVPWM algorithm routines.If to obtain voltage and frequency
Rate can flexible modulation three phase mains, controller programming complexity may proceed to increase.The device is opened by power tube
The limitation of frequency is closed, frequency can not be very high, such as IGBT highest frequencies requirement is in 50KHz or so, but its voltage class and work(
Rate grade can be very high.Therefore, the topology is used primarily in the less demanding occasion of the quality of power supply, and the application requirements high voltage is big
Power, such as electric machine speed regulation, combining inverter.
The topology 2 of accompanying drawing 6 is compared with topology 1, and controller be able to can also be programmed with program curing, controller, controller programming
Amount greatly reduces, and controller need not write the program of complexity, it is only necessary to produce the sinusoidal signal of voltage and frequency-adjustable section, this
For the controller with supporting C language exploitation, it is only necessary to which A sin (Bt) just can realize, wherein A adjusting amplitudes, B regulations
Frequency.The sinusoidal signal of controller output, the signal produces PWM ripple by digital power amplifier chip, then again through rear class work(
Put the amplification of chip power.Microcontroller and digital power amplifier chips can produce the signal of high frequency, produce in this way
PWM frequency can be very high.Due to using metal-oxide-semiconductor digital power amplifier chip material, therefore its voltage endurance capability is low, the output of power more
Suffer from limitation.If it is intended to output HIGH voltage, can use transformer boost.
In grid stimulating device, from sinusoidal signal to power amplification after PWM waveform, using two-stage form, the first order will
Relatively low sinusoidal signal is converted into 5V pwm signal；The second level as drive signal, then carries out the PWM waveform of the first order
Power amplification, the way of output uses bridge-tied load BTL（Bridge Tied load）, two power amplifier output ends, power amplifier it is defeated
It is the mirror image of another output end to go out, that is to say, that the signal being added in load differs 180 ° in phase, so finally
Obtained waveform is the double voltage of original Single-end output.The waveform of final output, after modulate circuit, RTDS AD collections
End collection output signal, is used as feedback signal, system one closed loop of formation, so as to eliminate error.
Claims (7)
1. a kind of grid stimulating device, it is characterized in that, mainly by real-timedigital simulation module, signal modulator, power amplifier,
Wave filter and the part of sampling feedback module five composition, real-timedigital simulation Module connection signal modulator, signal modulator connection
Power amplifier, power amplifier connection wave filter, wave filter connection sampling feedback module, the real-time number of sampling feedback module connection
Word emulation module, wave filter output analog signal；Real-timedigital simulation module is used to set up and simulated grid model, produces sinusoidal
Signal；Power amplifier uses the digital power amplifier chip of application digital power amplifier technology, and form, first order amplification are amplified using two-stage
The relatively low sinusoidal signal of amplitude is converted into 5V pwm signal by signal modulator, second level amplification is by power amplifier by the
The PWM waveform of one-level carries out amplitude and power amplification as drive signal, and its mode signal output uses bridge-tied load BTL
（Bridge Tied load）, with two power amplifier output ends, the output of a power amplifier is the mirror image of another output end, two
Output waveform differs 180 ° in phase, and amplitude is twice of Single-end output waveform；Wave filter uses LCL topological structures, is used for
Filter out higher hamonic wave, it is ensured that waveform is undistorted and does not introduce harmonic wave to power network；Sampling feedback module is used to gather wave filter output
Signal, and the AD collection terminals of real-timedigital simulation module are fed back to, system formation closed loop eliminates error.
2. grid stimulating device as claimed in claim 1, it is characterized in that, the grid stimulating device falls for analog voltage,
Three-phase imbalance, frequency fluctuation；RTDS simulation softwares and material object are connected to together by it, with reliable HWIL simulation function；
Utilize real-timedigital simulation module（RTDS）Set up and simulated grid model, voltage, the current waveform of certain node are exported, through outside
The amplitude and power of power amplifier waveform amplification, it is ensured that waveform is undistorted and does not introduce harmonic wave to power network, while can be according to need
Increase feedback element.
3. grid stimulating device as claimed in claim 1, it is characterized in that, the grid stimulating device mainly includes RTDS and power
Amplifier, RTDS can be from the power system simulation software or controller approved in the industry, and the latter is the power of independent development
Amplifier, the power amplifier uses digital power amplifier technology, and its core is digital power amplifier chip, and its switching frequency is reachable
300kHz。
4. grid stimulating device as claimed in claim 1, it is characterized in that, the power amplifier uses two-stage form, the first order
The RTDS sine waves exported are changed into 5V pwm signal, PWM waveform as drive signal, is driven digital power amplifier by the second level
Chip exports PWM；The way of output uses bridge-tied load BTL（Bridge Tied load）, the doubleway output that 180 ° of mutual deviation, most
The voltage obtained eventually is twice of original Single-end output.
5. grid stimulating device as claimed in claim 1, it is characterized in that, the power amplifier is examined for actual electric network
The scope of mains by harmonics is considered probably within 10KHz, and the switching frequency of digital power amplifier chip is up to 300KHz, for the former 30
Times；Therefore, the harmonic wave that the device is introduced can be neglected；300kHz switching frequencies are relied on simultaneously, and the design of low pass filter is just very simple
It is single, and the requirement to LC parameters is very low, and the volume of wave filter is also smaller；Wave filter uses LCL structures.
6. grid stimulating device as claimed in claim 1, it is characterized in that, described power amplifier, because of digital power amplifier core
Piece dispersiveness very little, different digital power amplifier chip input identical waveforms, the waveform after filtering output is almost consistent, therefore,
Three uniphase amplifier parallel connections build three phase power amplifier, also can improve power grade by power amplifier chips in parallel.
7. grid stimulating device as claimed in claim 1, it is characterized in that, the power amplifier, its output voltage and work(
Rate is limited by digital power amplifier chip, except improving power grade by power amplifier chips in parallel, also can select boosting transformation
Device improves output voltage.
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| CN201610170440.0A CN107230975A (en) | 2016-03-24 | 2016-03-24 | A kind of grid stimulating device |
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| CN201610170440.0A CN107230975A (en) | 2016-03-24 | 2016-03-24 | A kind of grid stimulating device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429588A (en) * | 2019-07-22 | 2019-11-08 | 上海交通大学 | Power electronic system Work condition analogue device with output compensation |
| CN110632532A (en) * | 2018-06-21 | 2019-12-31 | 中国电力科学研究院有限公司 | Test system and method for meeting parallel operation of multiple groups of string-type photovoltaic inverters |
| CN111624895A (en) * | 2020-05-07 | 2020-09-04 | 中国科学院电工研究所 | Real-time power grid simulation system |
| CN113779917A (en) * | 2021-09-15 | 2021-12-10 | 臻驱科技（上海）有限公司 | Automatic EMC filter design method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110632532A (en) * | 2018-06-21 | 2019-12-31 | 中国电力科学研究院有限公司 | Test system and method for meeting parallel operation of multiple groups of string-type photovoltaic inverters |
| CN110429588A (en) * | 2019-07-22 | 2019-11-08 | 上海交通大学 | Power electronic system Work condition analogue device with output compensation |
| CN110429588B (en) * | 2019-07-22 | 2021-06-29 | 上海交通大学 | Power electronic system working condition simulation device with output compensation |
| CN111624895A (en) * | 2020-05-07 | 2020-09-04 | 中国科学院电工研究所 | Real-time power grid simulation system |
| CN111624895B (en) * | 2020-05-07 | 2023-10-03 | 中国科学院电工研究所 | Real-time power grid simulation system |
| CN113779917A (en) * | 2021-09-15 | 2021-12-10 | 臻驱科技（上海）有限公司 | Automatic EMC filter design method |
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