CN107863889B - A kind of grid disturbance device - Google Patents
A kind of grid disturbance device Download PDFInfo
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- CN107863889B CN107863889B CN201711226916.9A CN201711226916A CN107863889B CN 107863889 B CN107863889 B CN 107863889B CN 201711226916 A CN201711226916 A CN 201711226916A CN 107863889 B CN107863889 B CN 107863889B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000013519 translation Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
-
- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of grid disturbance devices, including three bridge arms, each bridge arm respectively corresponds the wherein phase in three-phase alternating current, cascade is provided at least two AC/AC conversion modules on each bridge arm, one end star-like connection for being used to connect external equipment of first AC/AC conversion module on each bridge arm, the first port for constituting grid disturbance device, for connecting three phase network；One end star-like connection for being used to connect external equipment of the last one AC/AC conversion module on each bridge arm, constitutes the second port of grid disturbance device, for connecting distributed generation system.The voltage at all AC/AC conversion module shared bridge arm both ends on bridge arm, therefore, the receiving voltage of the power device in each AC/AC conversion module is very low, does not need the higher power device of voltage class, and the operational reliability of power device is higher.Also, Industrial Frequency Transformer is eliminated, therefore, grid disturbance device has the characteristics that small in size and high-efficient.
Description
Technical field
The present invention relates to a kind of grid disturbance devices.
Background technique
In recent years, due to wind-power electricity generation fast development, the measuring technology of wind-power electricity generation is paid more and more attention.Grid disturbance dress
Setting is important one kind in wind-power electricity generation test device, is occupied an important position in wind-powered electricity generation testing field.Existing grid disturbance dress
Set and multi-winding isolation transformer mostly used to be isolated, be mainly characterized by being isolated using multiwinding transformer, split-phase it is defeated
Out, input side uses LC filter and output boostering transformer, and power grid connects the primary side winding of multiwinding transformer, and Multiple coil becomes
Depressor has multiple vice-side windings, exports for split-phase, is then exported by output boostering transformer.Since input side Multiple coil becomes
Depressor volume is big, low efficiency, and filter and upgrading transformer is needed just to can be attached to power grid, therefore, all in all, this power grid
There is low efficiencys, bulky disadvantage for disturbance device.
A kind of grid disturbances are disclosed in the Chinese patent document that Authorization Notice No. is CN103078316B to fill
It sets, including three-phase bridge PWM rectifier and H bridge three-phase four-wire system PWM inverter, the exchange side of rectifier is connected with power grid, whole
The DC side of stream side is connect with inverter direct-flow side, and LC filter terminates one in inverter ac side, the output of LC filter
Isolating transformer, the secondary side of isolating transformer and load connect.The device can be realized grid voltage amplitude and frequency disturbance
And the simulation of mains by harmonics phenomenon, and can be realized the two-way flow of energy, accurate simulation grid disturbance.But the power grid
In voltage disturbance generating device rectifier and inverter only one, then, the receiving voltage of rectifier and inverter is larger, phase
Ying Di, the voltage that the power device in rectifier and inverter is born is also larger, not only needs the higher power device of voltage class
Part, and high voltage will affect the normal operation of power device, reduce the operational reliability of power device.
Summary of the invention
The object of the present invention is to provide a kind of grid disturbance devices, will affect the normal of power device to solve high voltage
Operation, the problem for causing its operational reliability low.
To achieve the above object, the present invention includes following technical scheme.
Device scheme one: this programme provides a kind of grid disturbance device, including three bridge arms, and each bridge arm respectively corresponds three
A wherein phase in phase alternating current, cascade is provided at least two AC/AC conversion modules on each bridge arm, and first on each bridge arm
One of connection side is sequentially connected in three phase network respectively on one end for connecting external equipment of a AC/AC conversion module
Different phases, another connection side constitutes star-like connection between each other, the first port of grid disturbance device constituted, for connecting
Three phase network；One of them connects on one end for connecting external equipment of the last one AC/AC conversion module on each bridge arm
Line side is sequentially connected the different phases in distributed generation system respectively, another connection side constitutes star-like connection, structure between each other
At the second port of grid disturbance device, for connecting distributed generation system.
Each bridge arm respectively corresponds the wherein phase in three-phase alternating current, is provided at least moreover, cascading on each bridge arm
Two AC/AC conversion modules, the voltage at all AC/AC conversion module shared bridge arm both ends on bridge arm, therefore, each
AC/AC conversion module only shares a part of voltage, moreover, the number of the AC/AC conversion module on bridge arm is more, the voltage shared
Lower, therefore, the receiving voltage of the power device in each AC/AC conversion module is very low, correspondingly, there is no need to voltage class compared with
High power device, and at low voltage, the operational reliability of power device is higher.Also, utilize bridge arm structure and bridge
AC/AC conversion module in arm, eliminates the Industrial Frequency Transformer output and input, and therefore, grid disturbance device has small in size
With high-efficient feature, while transformer will be output and input and be changed to AC/AC conversion module, on basis small in size and high-efficient
On, additionally it is possible to realize the two-way flow of energy.
Device scheme two: at least one AC/AC conversion module on the basis of device scheme one, in grid disturbance device
For High Frequency Link AC/AC converter, the High Frequency Link AC/AC converter includes sequentially connected rectification unit, inversion unit, isolation
Transformer and AC/AC converter unit.
Device scheme three: on the basis of device scheme two, the inversion unit is full bridge inverter, the AC/AC
Converter unit is full-bridge type cycle translation circuit, and the full-bridge type cycle translation circuit includes the first bridge arm and the second bridge arm, institute
It is in series by the first power device group and the second power device group to state the first bridge arm, second bridge arm is by third power device
Group and the 4th power device group it is in series, the first power device group, the second power device group, third power device group and
4th power device group is made of the power device of two differential concatenations.
Device scheme four: on the basis of device scheme three, the separate isolation in the full-bridge type cycle translation circuit becomes
The side of depressor is connected with LC filter circuit.
Device scheme five: on the basis of device scheme two or three or four, the rectification unit is full bridge rectifier.
Device scheme six: it on the basis of device scheme two or three or four, is set between the rectification unit and inversion unit
It is equipped with bus capacitor.
Detailed description of the invention
Fig. 1 is grid disturbance device overall topology figure；
Fig. 2 is the circuit structure diagram of High Frequency Link AC/AC converter.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
As shown in Figure 1, grid disturbance device includes three bridge arms, each bridge arm is respectively corresponded in three-phase alternating current wherein
One phase, the first bridge arm of setting correspond to the U phase in three-phase alternating current, and the second bridge arm corresponds to the V phase in three-phase alternating current, third bridge arm
W phase in corresponding three-phase alternating current.
Cascade is provided with N number of AC/AC conversion module on each bridge arm, and the specific value of N is set according to actual needs.Each bridge
In AC/AC conversion module on arm, defining first AC/AC conversion module has both ends, and wherein one end is one end of corresponding bridge arm,
For connecting external other relevant devices, the other end is used to cascade with second AC/AC conversion module, similarly, defines n-th
AC/AC conversion module has both ends, and wherein one end is the other end of corresponding bridge arm, another for connecting external other relevant devices
End with the N-1 AC/AC conversion module for cascading.And second AC/AC conversion module is to the N-1 AC/AC conversion module
Both ends cascaded with adjacent AC/AC conversion module.So, the use of first AC/AC conversion module on this three bridge arms
In one end star-like connection for connecting external other relevant devices, the first port of grid disturbance device is constituted；On this three bridge arms
N-th AC/AC conversion module for connecting one end star-like connections of external other relevant devices, constitute grid disturbance device
Second port, as shown in Figure 1.In the present embodiment, the first port of grid disturbance device is for connecting three phase network, second end
Mouth disturbs side, i.e. distributed generation system for connecting, such as: wind generator system.
In the present embodiment, in grid disturbance device, at least one AC/AC conversion module is High Frequency Link AC/AC converter,
Further, all AC/AC conversion modules in grid disturbance device are High Frequency Link AC/AC converter.The present embodiment mentions
For a kind of particular circuit configurations of High Frequency Link AC/AC converter, as shown in Fig. 2, High Frequency Link AC/AC converter includes being sequentially connected
Rectification unit, bus capacitor, inversion unit, isolating transformer and AC/AC converter unit.
Wherein, inversion unit is high-frequency inverter, can use push-pull type, semibridge system or full-bridge type, and AC/AC transformation is single
Member is full-bridge type cycle translation circuit, can use full wave type or full-bridge type.In view of the design of output voltage and power is wanted
It asks, finally determining circuit structure is as shown in Fig. 2, inversion unit is full bridge inverter.In Fig. 2, the DC voltage at the both ends Ci
For input direct-current voltage, Q1, Q2, Q3 and Q4 form full bridge inverter, TRFor high-frequency isolation transformer.
Full-bridge type cycle translation circuit includes the first bridge arm and the second bridge arm, and the first bridge arm is by the first power device group and the
Two power device groups are in series, and the second bridge arm is in series by third power device group and the 4th power device group, and this four
Power device group is made of the power device of two differential concatenations, in the present embodiment, these power devices by taking MOSFET as an example,
Wherein, the first power device group by differential concatenation MOSFET element Q5And Q5' constitute, form two-way switch；Second power device
Group by differential concatenation MOSFET element Q6And Q6' constitute, form two-way switch；Third power device group is by differential concatenation
MOSFET element Q7And Q7' constitute, form two-way switch；4th power device group by differential concatenation MOSFET element Q8And Q8’
It constitutes, forms two-way switch.Also, the side of the separate isolating transformer in the full-bridge type cycle translation circuit is connected with by Lo
The LC filter circuit constituted with Co.
The High Frequency Link cycle changing type of this paper uses phase shifting control scheme (Q1, Q2, Q3 and Q4 switching tube), phase shifting control
Basic functional principle is that two switching tube complementations conducting of each bridge arm of full-bridge circuit, the switching tube of two bridge arms is led
A phase is differed between logical, i.e., so-called phase shifting angle is wide to adjust output voltage pulse by adjusting the size of this phase shifting angle
Degree achievees the purpose that adjust corresponding output voltage.Therefore, input direct-current voltage is after the high-frequency inversion of full-bridge inverter
SPWPM (Sine pulse width and position modulation) wave of high frequency adjacent pulse reversed polarity each other is exported, which contains the whole of SPWM wave
Information is suitable for high frequency transformer transmission.It is same by full-bridge type cycle translation circuit after SPWPM wave is isolated by high frequency transformer
Negative pulse in the positive half cycle time, is turned into positive pulse, the positive pulse in the negative half period time is turned into negative pulse by step rectification
Later, exchange Unipolar SPWM wave will be obtained, SPWM wave is by exporting smooth sinusoidal voltage after LC filtering.Due to complete
Bridge-type cycle translation circuit belongs to the prior art, and the present embodiment carries out specifically with regard to the working principle no longer to the translation circuit
It is bright.
In addition, rectification unit is full-bridge circuit in the present embodiment.
So, the one of port of exchange side and one of port of AC/AC converter unit of rectification unit are constituted
Wherein one end of AC/AC conversion module defined above；Another port of the exchange side of rectification unit and AC/AC converter unit
Another port constitute the other end of AC/AC conversion module defined above.So, first height in any one bridge arm
In frequency chain AC/AC converter, one of port of the exchange side of rectification unit and one of port of AC/AC converter unit
For one end of the bridge arm；Another port of the exchange side of rectification unit and another port of AC/AC converter unit are used to connect
Connect second High Frequency Link AC/AC converter.In n-th High Frequency Link AC/AC converter in any one bridge arm, rectification unit
One of port of the one of port and AC/AC converter unit that exchange side becomes for connecting the N-1 High Frequency Link AC/AC
Parallel operation；Another port of exchange side and another port of AC/AC converter unit of rectification unit are the other end of the bridge arm.
For first High Frequency Link AC/AC converter in these three bridge arms, wherein the one of the exchange side of corresponding three rectification units
A port is correspondingly connected with three phase network, one of port star-like connection of corresponding three AC/AC converter units；For this three
N-th High Frequency Link AC/AC converter in a bridge arm, the star-like company in another port of the exchange side of corresponding three rectification units
It connects, another port of corresponding three AC/AC converter units is correspondingly connected with wind generator system.
The working principle of High Frequency Link inverse cascade in High Frequency Link AC/AC converter is phase shift high-frequency chain inverter, wherein
D1-D4 uses phase shift SPWM control model, and D5-D8 is modulated using cycle.
When energy is flowed from power grid side direction perturbation side, input side work exports level work in high frequency in SPWM rectification mode
Chain inverter mode outputs and inputs to form cascade structure, intermediate to be isolated by high frequency transformer.Save the work output and input
Frequency power transformer is isolated using high frequency transformer, is had the characteristics that small in size and high-efficient.It will output and input and be changed to simultaneously
MMC rectification and inversion topological, realize the two-way flow of energy.
Specific embodiment of the present invention is presented above, but the present invention is not limited to described embodiment.
Under the thinking that the present invention provides, to the skill in above-described embodiment by the way of being readily apparent that those skilled in the art
Art means are converted, are replaced, are modified, and play the role of with the present invention in relevant art means it is essentially identical, realize
Goal of the invention it is also essentially identical, the technical solution formed in this way is to be finely adjusted to be formed to above-described embodiment, this technology
Scheme is still fallen in protection scope of the present invention.
Claims (6)
1. a kind of grid disturbance device, which is characterized in that including three bridge arms, each bridge arm is respectively corresponded in three-phase alternating current
A wherein phase, cascade is provided at least two AC/AC conversion modules on each bridge arm, first AC/AC transformation on each bridge arm
One of connection side is sequentially connected the different phases in three phase network respectively on one end for connecting external equipment of module, separately
One connection side constitutes star-like connection between each other, the first port of grid disturbance device is constituted, for connecting three phase network；Respectively
One of connection side is distinguished successively on one end for connecting external equipment of the last one AC/AC conversion module on bridge arm
The different phases in distributed generation system are connected, another connection side constitutes star-like connection between each other, constitutes grid disturbance dress
The second port set, for connecting distributed generation system.
2. grid disturbance device according to claim 1, which is characterized in that at least one AC/ in grid disturbance device
AC conversion module is High Frequency Link AC/AC converter, and the High Frequency Link AC/AC converter includes sequentially connected rectification unit, inverse
Become unit, isolating transformer and AC/AC converter unit.
3. grid disturbance device according to claim 2, which is characterized in that the inversion unit is full bridge inverter,
The AC/AC converter unit is full-bridge type cycle translation circuit, and the full-bridge type cycle translation circuit includes the first bridge arm and the
Two bridge arms, first bridge arm is in series by the first power device group and the second power device group, and second bridge arm is by
Three power device groups and the 4th power device group are in series, the first power device group, the second power device group, third function
Rate device group and the 4th power device group are made of the power device of two differential concatenations.
4. grid disturbance device according to claim 3, which is characterized in that remote in the full-bridge type cycle translation circuit
Side from isolating transformer is connected with LC filter circuit.
5. according to grid disturbance device described in Claims 2 or 3 or 4, which is characterized in that the rectification unit is full-bridge rectification
Circuit.
6. according to grid disturbance device described in Claims 2 or 3 or 4, which is characterized in that the rectification unit and inversion unit
Between be provided with bus capacitor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711226916.9A CN107863889B (en) | 2017-11-29 | 2017-11-29 | A kind of grid disturbance device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711226916.9A CN107863889B (en) | 2017-11-29 | 2017-11-29 | A kind of grid disturbance device |
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| CN107863889B true CN107863889B (en) | 2019-11-22 |
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| US11899067B2 (en) * | 2019-07-23 | 2024-02-13 | Shanghai Jiao Tong University | Testing circuit, system and control method for multiple submodules of cascaded converter |
| CN111211697A (en) * | 2020-01-15 | 2020-05-29 | 西安交通大学 | Modular multi-level high-power AC-AC converter based on high-frequency transformer |
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| CN103078316A (en) * | 2013-01-06 | 2013-05-01 | 湖北省电力公司电力科学研究院 | Network voltage disturbance generating device and control method thereof |
| CN104953582A (en) * | 2015-06-25 | 2015-09-30 | 深圳市禾望电气股份有限公司 | Three-phase power grid disturbance generating device and control method thereof |
| CN106972759A (en) * | 2017-05-26 | 2017-07-21 | 云南电网有限责任公司电力科学研究院 | A kind of power supply of simulating grid disturbance |
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| CN107863889A (en) | 2018-03-30 |
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