CN108777547B - A kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube - Google Patents
A kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube Download PDFInfo
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- CN108777547B CN108777547B CN201810519879.9A CN201810519879A CN108777547B CN 108777547 B CN108777547 B CN 108777547B CN 201810519879 A CN201810519879 A CN 201810519879A CN 108777547 B CN108777547 B CN 108777547B
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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
- H02M5/40—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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of friendship-friendship power inverters of no DC bus energy-storage travelling wave tube, the the first three phase full bridge circuit to connect together including DC bus, second three phase full bridge circuit and third three phase full bridge circuit, the exchange input side of first three phase full bridge circuit inputs three phase mains, one end of first filter capacitor, one end of second filter capacitor and one end of third filter capacitor are connected, the other end of first filter capacitor connects the first phase power supply, the other end of second filter capacitor connects the second phase power supply, the other end of third filter capacitor connects third phase power supply, each phase power supply in three phase mains connects the exchange input side of each phase in third three phase full bridge circuit by filter inductance respectively.The present invention can reduce conduction loss and switching loss, be conducive to integrated.
Description
Technical field
The present invention relates to power inverter fields, more particularly to a kind of friendship-friendship power of no DC bus energy-storage travelling wave tube
Converter.
Background technique
In modern electrical energy production and consumptive link, friendship-friendship power inverter can play an important role.For example, wind-force
The electric voltage frequency that generator generates is usually to change, and generator is caused not to be connected with utility network directly.Friendship-friendship power becomes
Parallel operation can play the role of the interface between generator and power grid, voltage identical with mains frequency be generated, so that variable-frequency power generation
The electric energy that machine generates can be for transmission in electric system.
It using most friendships-friendship power inverter include in the industrial production at present cross-straight-intersection power inverter and double
Pwm converter.These two types of converters are required to install the storage capacitor of large capacity on DC bus, increase the volume of system
With weight, reduce the power density of system.In addition, the DC bus storage capacitor of large capacity generally uses electrolytic capacitor, it is
Whole system reliability link the weakest, failure rate accounting in entire power converter system reach 30%.Especially
In the application of certain working environment harshnesses, such as aviation built-in type starting/generator system, environment temperature be up to 300 DEG C with
On, electrolyte is volatile, and electrolytic capacitor is difficult to work normally.
To solve the problems, such as that these two types of converters exist, academia proposes matrix converter (MC), and MC includes direct-type
With two kinds of stage type typical topologys, it is not necessarily to high-capacity direct current bus energy-storage travelling wave tube, is easy to get efficient power conversion.So
And it is limited to the development level of power device, two-way switch needed for MC need to be made of discrete device, and there are the following problems:
1) discrete device is unfavorable for the system integration, limits further increasing for system power-density；2) what discrete device was constituted is two-way
Constant conduction load current is switched, conduction loss is larger, limits further increasing for transfer efficiency；3) two-way switch uses
PWM control, frequent switch motion generate a large amount of switching loss, also have an adverse effect to transfer efficiency.
Summary of the invention
Goal of the invention: the object of the present invention is to provide one kind can reduce conduction loss and switching loss, be conducive to it is integrated
The friendship without DC bus energy-storage travelling wave tube-friendship power inverter.
Technical solution: to reach this purpose, the invention adopts the following technical scheme:
Friendship-friendship power inverter of no DC bus energy-storage travelling wave tube of the present invention, including DC bus connect together
The first three phase full bridge circuit, the second three phase full bridge circuit and third three phase full bridge circuit, the exchange of the first three phase full bridge circuit
Input side inputs three phase mains, one end of the first filter capacitor, one end of the second filter capacitor and third filter capacitor one
End is connected, and the other end of the first filter capacitor connects the first phase power supply, and the other end of the second filter capacitor connects the second phase power supply,
The other end of third filter capacitor connects third phase power supply, and each phase power supply in three phase mains is connected by filter inductance respectively
The exchange input side of each phase in third three phase full bridge circuit.
Further, the first three phase full bridge circuit control method the following steps are included:
S1.1: acquisition three-phase mains voltage uA、uBAnd uC；
S1.2: according to uA、uBAnd uCSize relation determine that the switch state of the first three phase full bridge circuit, voltage are maximum
Bridge arm switch conduction in one phase, the smallest phase lower bridge arm switch conduction of voltage, rest switch are held off.
Further, the second three phase full bridge circuit control method the following steps are included:
S2.1: acquisition three-phase mains voltage uA、uBAnd uC；
S2.2: DC bus-bar voltage u is calculateddc；udcFor three-phase mains voltage uA、uBAnd uCMiddle maxima and minima it
Difference；
S2.3: the modulation ratio m of the second three phase full bridge circuit is calculated；M is desired output voltage amplitude uom *With DC bus
Voltage udcThe ratio between；
S2.4: believed using the switch that space vector modulation algorithm or carrier modulation algorithm generate the second three phase full bridge circuit
Number.
Further, the third three phase full bridge circuit control method the following steps are included:
S3.1: acquisition three-phase mains voltage uA、uBAnd uC；
S3.2: judge uA、uB、uCSize relation, bridge arm switch conduction in the maximum phase of voltage, lower bridge arm switch closes
It is disconnected；Bridge arm switch OFF in the smallest phase of voltage, lower bridge arm switch conduction；
S3.3: being intermediate phase for voltage swing, thereon, lower bridge arm use pulse width modulating technology.
It further, is intermediate phase for voltage swing in the step S3.3, thereon, the duty cycle signals of lower bridge arm
From in the closed-loop current control of filter inductance, the specific steps are as follows:
S3.3.1: the electric current for mutually exchanging side filter inductance, the feedback signal i as closed loop controller are acquiredy；
S3.3.2: the reference value i of the phase current is calculatedy *, steps are as follows:
S3.3.2.1: three-phase mains voltage u is calculated according to formula (1)A、uBAnd uCComponent under two-phase stationary coordinate system
uαAnd uβ:
S3.3.2.2: reference value of the three phase mains electric current under two-phase stationary coordinate system is calculated according to formula (2)With
In formula (2), P*For the active power of converter transmission, determined by load；Q*For desired power supply reactive power；
S3.3.2.3: further, the reference value i of three phase mains electric current is calculated according to formula (3)A *、iB *、iC *:
S3.3.2.4: in iA *、iB *、iC *It is middle to select to correspond to voltage swing for the electric current of interphase, in this, as electric current iy
Reference value iy *；
S3.3.3: by iy *And iyInput signal of the difference as closed loop controller, wherein closed loop controller is ratio-product
Sub-controller, the signal of generation are the desired value u of the phase filter inductance voltageL *；
S3.3.4: according to uL *Calculate the duty ratio d that bridge arm switchs in the phasePWith the duty ratio d of lower bridge arm switchN:
In formula (4), umaxFor three-phase mains voltage uA、uBAnd uCIn maximum value, umidFor three-phase mains voltage uA、uBAnd uC
In median, uminFor three-phase mains voltage uA、uBAnd uCIn minimum value.
The utility model has the advantages that having as follows the invention discloses a kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube
The utility model has the advantages that
1) it is not necessarily to DC bus energy-storage travelling wave tube, is conducive to the power density of raising system；
2) mature three phase full bridge power module building can be used, it is easy to accomplish, the integrated level of system can be improved；
3) switching frequency of the first three phase full bridge circuit is power frequency, has low-down switching loss；
4) at any time, only one bridge arm carries out chop control, switching loss in third three phase full bridge circuit
Very little；
5) load current, therefore the electric current that the two is total is connected in the first three phase full bridge circuit and third three phase full bridge circuit jointly
Stress does not increase, and due to flowing through lesser electric current, the conduction loss of system is smaller.
Detailed description of the invention
Fig. 1 is the topology diagram of power inverter in the specific embodiment of the invention；
Fig. 2 is three-phase mains voltage, DC bus-bar voltage and DC bus current low frequency in the specific embodiment of the invention
The example waveform of component；
Fig. 3 is that the first three phase full bridge circuit and third three phase full bridge circuit exchange input in the specific embodiment of the invention
The example waveform of side electric current and source current；
Fig. 4 is the example waveform of three-phase output voltage and electric current in the specific embodiment of the invention.
Specific embodiment
Technical solution of the present invention is further introduced With reference to embodiment.
Present embodiment discloses a kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube, such as Fig. 1 institute
Show, the first three phase full bridge circuit 1, the second three phase full bridge circuit 2 and the third three phase full bridge electricity to connect together including DC bus
The exchange input side on road 3, the first three phase full bridge circuit 1 inputs three phase mains, one end of the first filter capacitor, the second filter capacitor
One end and one end of third filter capacitor be connected, the other end of the first filter capacitor connects the first phase power supply, the second filtering
The other end of capacitor connects the second phase power supply, and the other end of third filter capacitor connects third phase power supply, every in three phase mains
One phase power supply connects the exchange input side of each phase in third three phase full bridge circuit 3 by filter inductance respectively.Wherein, three filters
The three-phase filter inductance 5 of 4, three filter inductances of three-phase filter capacitor composition of wave capacitor composition is also as shown in Figure 1.
The control method of first three phase full bridge circuit 1 the following steps are included:
S1.1: acquisition three-phase mains voltage uA、uBAnd uC；
S1.2: according to uA、uBAnd uCSize relation determine that the switch state of the first three phase full bridge circuit 1, voltage are maximum
Bridge arm switch conduction in one phase, the smallest phase lower bridge arm switch conduction of voltage, rest switch are held off.
Under the control method of above-mentioned first three phase full bridge circuit, DC bus-bar voltage udcWaveform it is as shown in Figure 2.By
Figure is it is found that udcIt is always the maximum line voltage of supply voltage, is not steady state value.Therefore, the tune of second three phase full bridge circuit
The u of fluctuation is taken into account in algorithm processeddc.It only needs to use u in its modulation algorithmdcAmendment modulation ratio in real time, specifically does
Method are as follows: the control method of the second three phase full bridge circuit 2 the following steps are included:
S2.1: acquisition three-phase mains voltage uA、uBAnd uC；
S2.2: DC bus-bar voltage u is calculateddc；udcFor three-phase mains voltage uA、uBAnd uCMiddle maxima and minima it
Difference；
S2.3: the modulation ratio m of the second three phase full bridge circuit 2 is calculated；M is desired output voltage amplitude uom *With direct current mother
Line voltage udcThe ratio between；
S2.4: believed using the switch that space vector modulation algorithm or carrier modulation algorithm generate the second three phase full bridge circuit 2
Number.
Friendship-friendship power inverter is usually used in driving constant power load, and in this case, second three phase full bridge circuit generates
The low frequency component of DC bus current be also drawn in Fig. 2.
Since the end DC bus P is by first three phase full bridge circuit clamping in the maximum input phase of voltage, N-terminal is clamped
In the smallest input phase of voltage, therefore, the correspondence phase bridge arm of third three phase full bridge circuit should also be clamped, to prevent its exchange filter
The current run-away of wave inductance, specific practice are as follows: the control method of third three phase full bridge circuit 3 the following steps are included:
S3.1: acquisition three-phase mains voltage uA、uBAnd uC；
S3.2: judge uA、uB、uCSize relation, bridge arm switch conduction in the maximum phase of voltage, lower bridge arm switch closes
It is disconnected；Bridge arm switch OFF in the smallest phase of voltage, lower bridge arm switch conduction；
S3.3: being intermediate phase for voltage swing, thereon, lower bridge arm use pulse width modulating technology.
It is intermediate phase for voltage swing in step S3.3, thereon, the duty cycle signals of lower bridge arm are from filter inductance
Closed-loop current control, the specific steps are as follows:
S3.3.1: the electric current for mutually exchanging side filter inductance, the feedback signal i as closed loop controller are acquiredy；
S3.3.2: the reference value i of the phase current is calculatedy *, steps are as follows:
S3.3.2.1: three-phase mains voltage u is calculated according to formula (1)A、uBAnd uCComponent under two-phase stationary coordinate system
uαAnd uβ:
S3.3.2.2: reference value of the three phase mains electric current under two-phase stationary coordinate system is calculated according to formula (2)With
In formula (2), P*For the active power of converter transmission, determined by load；Q*For desired power supply reactive power；
S3.3.2.3: further, the reference value i of three phase mains electric current is calculated according to formula (3)A *、iB *、iC *:
S3.3.2.4: in iA *、iB *、iC *It is middle to select to correspond to voltage swing for the electric current of interphase, in this, as electric current iy
Reference value iy *；
S3.3.3: by iy *And iyInput signal of the difference as closed loop controller, wherein closed loop controller is ratio-product
Sub-controller, the signal of generation are the desired value u of the phase filter inductance voltageL *；
S3.3.4: according to uL *Calculate the duty ratio d that bridge arm switchs in the phasePWith the duty ratio d of lower bridge arm switchN:
In formula (4), umaxFor three-phase mains voltage uA、uBAnd uCIn maximum value, umidFor three-phase mains voltage uA、uBAnd uC
In median, uminFor three-phase mains voltage uA、uBAnd uCIn minimum value.
Below with uA>uB>uCRelationship be further elaborated, the working principle of other voltage relationship downconverters
It is similar.At this point, bridge arm switch and C phase lower bridge arm switch are held in A phase, rest switch in the first three phase full bridge circuit 1
Shutdown.In third three phase full bridge circuit 3, bridge arm switch is held in A phase, and exchange side filter inductance is flowed by the switch
To the end DC bus P；C phase lower bridge arm switch is also held on, and is exchanged side filter inductance by the switch and is flowed to DC bus N
End；The upper bridge arm and lower bridge arm that B phase switchs carry out chop control.
According to the control method of above-mentioned the first three phase full bridge circuit 1 and third three phase full bridge circuit 3 it is found that A phase power supply
Bridge arm switching current forms in A phase of the electric current by flowing through the first three phase full bridge circuit 1 and third three phase full bridge circuit 3, C phase power supply
Electric current is made of the C phase lower bridge arm switching current for flowing through the first three phase full bridge circuit 1 and third three phase full bridge circuit 3.And B phase electricity
Ource electric current is only the electric current for flowing through the B phase bridge arm of third three phase full bridge circuit 3.Therefore, the sine to realize three phase mains electric current
Change, should ensure that the sineization of B phase source current first.According to instantaneous power theory, the source current under two-phase stationary coordinate system
Reference valueWithAre as follows:
In formula, P*For the active power of converter transmission, determined by load；Q*For desired power supply reactive power；uαAnd uβ
For three-phase mains voltage (uA, uB, uC) component under two-phase stationary coordinate system, calculation method are as follows:
According toWithThe reference value i of three phase mains electric current can be calculatedA *、iB *、iC *:
Acquire B phase inductance electric current iB, by iB *And iBDifference as the defeated of closed loop controller (such as proportional-plus-integral controller)
Enter signal, the output signal which generates is the voltage difference desired value u of B phase filter inductanceL *.According to Fig. 1, it is known that B
The voltage of circuitry phase meets:
Wherein, dPAnd dNFor the duty ratio that bridge arm in B phase and lower bridge arm switch, the sum of they should be 1, it may be assumed that
dP+dN=1 (9)
It can be solved by upper two formula:
Obtaining dPAnd dNAfterwards, that is, it can produce the switching signal of bridge arm and lower bridge arm in B phase.Using the closed loop control method,
It may make that B phase source current is identical as its desired value, when desired value is sinusoidal quantity, the sineization of source current can be realized.
When the size of three-phase mains voltage meets other relationships, the working principle of converter is similar.
Fig. 2 to Fig. 4 is some Vital Voltages and current waveform example of apparatus of the present invention.In Fig. 2, DC bus-bar voltage begins
It is eventually the difference of supply voltage maxima and minima, the low frequency component of DC bus current is then the power and direct current of desired output
The ratio between busbar voltage.In Fig. 3, the AC input current of the first three phase full bridge circuit 1 and exchanging for third three phase full bridge circuit 3 are defeated
Enter electric current and add up to three phase mains electric current, therefore two full-bridge circuit shared load currents, total device current stress is not
Increase.Higher harmonic current in source current can be filtered out by additional power supply side filter, and then obtain the electricity of sineization
Ource electric current.In Fig. 4, threephase load electric current height sine shows that apparatus of the present invention can be realized friendship-friendship power conversion.
Claims (1)
1. a kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube, it is characterised in that: connect together including DC bus
The first three phase full bridge circuit (1), the second three phase full bridge circuit (2) and third three phase full bridge circuit (3), the first three phase full bridge electricity
The exchange input side on road (1) inputs three phase mains, one end of the first filter capacitor, one end of the second filter capacitor and third filter
One end of wave capacitor is connected, and the other end of the first filter capacitor connects the first phase power supply, the other end connection of the second filter capacitor
Second phase power supply, the other end of third filter capacitor connect third phase power supply, and each phase power supply in three phase mains passes through respectively
Filter inductance connects the exchange input side of each phase in third three phase full bridge circuit (3)；The direct current of first three phase full bridge circuit (1)
Bus anode, the DC bus anode of the second three phase full bridge circuit (2), third three phase full bridge circuit (3) DC bus anode
It is both connected to together, the DC bus of the DC bus negative terminal of the first three phase full bridge circuit (1), the second three phase full bridge circuit (2)
Negative terminal, third three phase full bridge circuit (3) DC bus negative terminal be both connected to together, the exchange of the second three phase full bridge circuit (2)
End is exported as three-phase；
The control method of the first three phase full bridge circuit (1) the following steps are included:
S1.1: acquisition three-phase mains voltage uA、uBAnd uC；
S1.2: according to uA、uBAnd uCSize relation determine the switch state of the first three phase full bridge circuit (1), voltage maximum one
Bridge arm switch conduction in phase, the smallest phase lower bridge arm switch conduction of voltage, rest switch are held off；
The control method of the second three phase full bridge circuit (2) the following steps are included:
S2.1: acquisition three-phase mains voltage uA、uBAnd uC；
S2.2: DC bus-bar voltage u is calculateddc；udcFor three-phase mains voltage uA、uBAnd uCThe difference of middle maxima and minima；
S2.3: the modulation ratio m of the second three phase full bridge circuit (2) is calculated；M is desired output voltage amplitude uom *With DC bus
Voltage udcThe ratio between；
S2.4: the switching signal of the second three phase full bridge circuit (2) is generated using space vector modulation algorithm or carrier modulation algorithm；
The control method of the third three phase full bridge circuit (3) the following steps are included:
S3.1: acquisition three-phase mains voltage uA、uBAnd uC；
S3.2: judge uA、uB、uCSize relation, bridge arm switch conduction in the maximum phase of voltage, lower bridge arm switch OFF；Electricity
Press bridge arm switch OFF in a smallest phase, lower bridge arm switch conduction；
S3.3: being intermediate phase for voltage swing, thereon, lower bridge arm use pulse width modulating technology；
It is intermediate phase for voltage swing in the step S3.3, thereon, the duty cycle signals of lower bridge arm are from filter inductance
Closed-loop current control, the specific steps are as follows:
S3.3.1: the electric current for mutually exchanging side filter inductance, the feedback signal i as closed loop controller are acquiredy；
S3.3.2: the reference value i of the phase current is calculatedy *, steps are as follows:
S3.3.2.1: three-phase mains voltage u is calculated according to formula (1)A、uBAnd uCComponent u under two-phase stationary coordinate systemαWith
uβ:
S3.3.2.2: reference value of the three phase mains electric current under two-phase stationary coordinate system is calculated according to formula (2)With
In formula (2), P*For the active power of converter transmission, determined by load；Q*For desired power supply reactive power；
S3.3.2.3: the reference value i of three phase mains electric current is calculated according to formula (3)A *、iB *、iC *:
S3.3.2.4: in iA *、iB *、iC *It is middle to select to correspond to voltage swing for the electric current of interphase, in this, as electric current iyGinseng
Examine value iy *；
S3.3.3: by iy *And iyInput signal of the difference as closed loop controller, wherein closed loop controller is proportional, integral control
Device processed, the signal of generation are the desired value u of the phase filter inductance voltageL *；
S3.3.4: according to uL *Calculate the duty ratio d that bridge arm switchs in the phasePWith the duty ratio d of lower bridge arm switchN:
In formula (4), umaxFor three-phase mains voltage uA、uBAnd uCIn maximum value, umidFor three-phase mains voltage uA、uBAnd uCIn
Median, uminFor three-phase mains voltage uA、uBAnd uCIn minimum value.
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| CN206743142U (en) * | 2017-05-19 | 2017-12-12 | 广东上水能源科技有限公司 | Brushless dual-feed motor arrangements for speed regulation with three full-control type current transformers |
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| EP2911287A1 (en) * | 2014-02-24 | 2015-08-26 | Danfoss Power Electronics A/S | Apparatus and method for reducing harmonics |
| CN104883069B (en) * | 2015-06-03 | 2017-10-27 | 南京航空航天大学 | The progress control method of matrix converter when input voltage is uneven |
| CN106208735A (en) * | 2016-08-24 | 2016-12-07 | 中南大学 | The matrix converter of a kind of third-harmonic zero-sequence voltage and control method |
| CN107888096B (en) * | 2017-12-25 | 2023-12-19 | 三峡大学 | Three-phase two-bridge arm three-level hybrid rectifier |
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| CN206743142U (en) * | 2017-05-19 | 2017-12-12 | 广东上水能源科技有限公司 | Brushless dual-feed motor arrangements for speed regulation with three full-control type current transformers |
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