CN106786535B - Grid stimulating device and its control method - Google Patents
Grid stimulating device and its control method Download PDFInfo
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- CN106786535B CN106786535B CN201611243301.2A CN201611243301A CN106786535B CN 106786535 B CN106786535 B CN 106786535B CN 201611243301 A CN201611243301 A CN 201611243301A CN 106786535 B CN106786535 B CN 106786535B
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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
- 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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Abstract
The present invention relates to power grid analogue technique field, a kind of grid stimulating device and its control method are disclosed.The grid stimulating device includes: the modular multilevel matrix converter and filter being connected；The input side of modular multilevel matrix converter is used to connect the input terminal of filter for connecting mains supply, outlet side；Mains supply of the modular multilevel matrix converter for being M to the number of phases is converted and is exported the voltage of transformation that the number of phases is L；Modular multilevel matrix converter includes: the bridge arm for the product that topological structure is identical and number is M and L, and each bridge arm is connected between the input side and outlet side of modular multilevel matrix converter with the matrix form that M multiplies L；Each bridge arm includes: the bridge arm inductance and N number of modularization level converter unit of concatenation.Present embodiment can not only control the high-power power grid of output voltage simulated high-pressure of grid stimulating device by adjusting the quantity of electric level conversion modular, and can effectively control its overall volume.
Description
Technical field
The present invention relates to power grid analogue technique field, in particular to a kind of grid stimulating device and its control method.
Background technique
Since grid stimulating device can simulate voltage dip, voltage flicker, voltage distortion and the voltage of actual electric network not
The abnormal operations such as balance, thus it can be in the case where not influencing actual electric network operation, for equipment of generating electricity by way of merging two or more grid systems, electric power
Energy storage device, power transmitting device and Electric Drive equipment etc. carry out relevant research and test provides convenience.
With increasing for power grid analog study, some grid stimulating devices are proposed.The prior art one discloses one
Kind of high-power energy can feedback type grid stimulating device comprising PWM (the Pulse Width of general DC busbar
Modulation, pulse width modulation, abbreviation PWM) rectifying part and power grid analog part point.PWM rectifying part includes input filter
Wave unit, three-phase bridge rectification unit, power grid analog part point are single including three single-phase inverters, output filter unit and isolation
Member.The prior art two discloses a kind of AC power source of simulating grid characteristic, is by G fairing, three-phase H bridge structure unsteady flow
Device, three-phase transformer are sequentially connected composition.
The present inventor has found in the implementation of the present invention: the simulation dress of the power grid as disclosed in the prior art one
The output power set depends on the input power of PWM rectifying part, and the three-phase bridge rectification unit of PWM rectifying part makes
The input power of PWM rectifying part is smaller, therefore the output power of the grid stimulating device is smaller.Due to the grid stimulating device
Output voltage be equal to the output voltage of power grid analog part point, and the single-phase inverter of power grid analog part point makes power grid analog part
The output voltage divided is smaller, therefore the output voltage of the grid stimulating device is also smaller.So in terms of voltage and power two
It measures, which is merely able to simulation low pressure small-power power grid.And AC power source disclosed in the prior art two is defeated
Power depends on three-phase transformer out, and with the increase of output power, the volume and weight of three-phase transformer is also significantly increased,
Therefore, the more difficult high-power power grid of easily simulated high-pressure of the grid stimulating device of the prior art.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of grid stimulating device and its control method, can not only lead to
The high-power power grid of output voltage simulated high-pressure of the quantity control grid stimulating device of adjustment electric level conversion modular is crossed, and can
Effectively control its overall volume.
In order to solve the above technical problems, embodiments of the present invention provide a kind of grid stimulating device, comprising: be connected
Modular multilevel matrix converter and filter；The input side of the modular multilevel matrix converter is for connecting
Mains supply, outlet side are used to connect the input terminal of the filter；The modular multilevel matrix converter is used for phase
Number is that the mains supply of M is converted and exported the voltage of transformation that the number of phases is L；The modular multilevel matrix converter packet
Include: the bridge arm for the product that topological structure is identical and number is M and L, each bridge arm are connected to institute with the matrix form that M multiplies L
It states between the input side and outlet side of modular multilevel matrix converter；Each bridge arm includes: the bridge arm inductance and N number of mould of concatenation
Block level translation unit；Wherein, the size of the output voltage of the grid stimulating device and the N are positively correlated, and the N is positive
Integer.
Embodiments of the present invention additionally provide a kind of control method of grid stimulating device, foregoing for controlling
The output voltage of grid stimulating device, comprising: according to the output reference voltage of the modular multilevel matrix converter, control
Obtain the bridge arm reference voltage of each bridge arm in the modular multilevel matrix converter；Obtain modular multilevel matrixing
The capacitance voltage of all modularization level converter units in device；According to the bridge arm reference voltage and modular multilevel of each bridge arm
The capacitance voltage of each modularization level converter unit in matrix converter, control obtain the module of each modularization level converter unit
Voltage reference value；By the reference electricity for modulating each modularization level converter unit in the modular multilevel matrix converter
Pressure, to control the output voltage of the simulating grid device.
Embodiment of the present invention in terms of existing technologies, using modular multilevel matrix converter to mains supply
It is converted, since each bridge arm in modular multilevel matrix converter includes N number of modularization level converter unit, and
And the number of the modularization level converter unit in the output voltage and bridge arm of grid stimulating device is positively correlated, it is possible to root
According to the quantity for the output voltage setting modularization level converter unit for needing power grid to be simulated, go out difference so as to flexible design
The grid stimulating device of output voltage, and then high-power grid stimulating device may be implemented, also, due to modularization level
Volume, the weight of converter unit are smaller, so for the three-phase transformer of relative volume large and bulky, additionally it is possible to effectively control
The overall volume of grid stimulating device.
In addition, the modularization level converter unit includes 4 full-control type devices of module capacitance and composition H bridge structural unit
Part；The module capacitance is connected to the H bridge structural unit.Since each modularization level converter unit is that single-phase full bridge becomes
Parallel operation, therefore the grid stimulating device can be realized four quadrant running, to realize energy feedback to power grid.
In addition, according to each modularization in the bridge arm reference voltage and modular multilevel matrix converter of each bridge arm
The capacitance voltage of level translation unit, control obtain the module voltage reference value of each modularization level converter unit, specifically include:
The average value of the bridge arm reference voltage of each bridge arm in the modular multilevel matrix converter is calculated；Respectively to modularization
The capacitance voltage of each modularization level converter unit carries out module capacitance voltage balancing control in multilevel matrix converter, obtains
The module voltage reference value of each modularization level converter unit；Wherein, the module capacitance voltage balancing control, so that modularization
The capacitance voltage of each modularization level converter unit in multilevel matrix converter is equal to where each modularization level converter unit
The capacitance voltage average value of bridge arm.
In addition, control obtains the modularization according to the output reference voltage of the modular multilevel matrix converter
The bridge arm reference voltage of each bridge arm in multilevel matrix converter, specifically includes: to the modular multilevel matrix converter
Input side electric current carry out input current control so that the input side electric current of modular multilevel matrix converter be equal to input electricity
Flow reference value；Output current control is carried out to the outlet side electric current of the modular multilevel matrix converter, so that modularization
The outlet side electric current of multilevel matrix converter is equal to output current reference value；To the modular multilevel matrix converter
Circulation carries out circulation control, so that the circulation inside modular multilevel matrix converter is equal to circulation reference value；By described
Input current control, output current control and circulation control, obtain the bridge arm voltage reference value of each bridge arm.
In addition, the acquisition of the input current reference value includes: that the first difference is calculated, wherein first difference is
All Modular electricals in the capacitance voltage reference value and modular multilevel matrix converter of modular multilevel matrix converter
The difference of the capacitance voltage average value of flat converter unit；Global capacitor voltage balance control is carried out to first difference, obtains mould
The input current reference value of block multilevel matrix converter；Wherein, the global capacitor voltage balance control, so that modularization
The capacitance voltage average value of all modularization level converter units is equal to modular multilevel matrix in multilevel matrix converter
The capacitance voltage reference value of converter.
In addition, the acquisition of the output current reference value includes: that the second difference is calculated, wherein second difference is
The output voltage reference value of grid stimulating device and the difference of output voltage；Output voltage control is carried out to second difference, is obtained
To the output current reference value of modular multilevel matrix converter.
In addition, the acquisition of the circulation reference value includes: the module to each bridge arm of modular multilevel matrix converter
Capacitance voltage average value carries out the control of bridge arm capacitor voltage balance；And the input to the modular multilevel matrix converter
Side and outlet side electric current carry out module capacitance voltage fluctuation and inhibit control, obtain the modular multilevel matrix converter
Circulation reference value.
In addition, bridge arm capacitor voltage balance control so that in modular multilevel matrix converter each bridge arm mould
Block capacitance voltage average value is equal to the capacitance voltage of all modularization level converter units in modular multilevel matrix converter
Average value.
In addition, the module capacitance voltage fluctuation inhibits control, so that the mould that modular multilevel matrix converter occurs
Block voltage fluctuation of capacitor is inhibited.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of first embodiment grid stimulating device according to the present invention；
Fig. 2 is the structural schematic diagram of first embodiment bridge arm according to the present invention；
Fig. 3 is the structural schematic diagram of modularization level converter unit in first embodiment according to the present invention；
Fig. 4 is the flow chart of the control method of second embodiment grid stimulating device according to the present invention；
Fig. 5 is that second embodiment by global capacitor voltage balance controls to obtain input current reference according to the present invention
The flow chart of value；
Fig. 6 is the process for obtaining exporting current reference value by output voltage control of second embodiment according to the present invention
Figure；
Fig. 7 be according to the present invention second embodiment controlled by bridge arm capacitor voltage balance and module capacitance voltage
Fluctuation inhibits control to obtain the flow chart of circulation reference value；
Fig. 8 be according to the present invention second embodiment by bridge arm voltage reference value and module capacitance balance of voltage control
The flow chart of module voltage reference value is made.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to each reality of the invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order to make the reader understand this application better, many technical details are proposed.But even if without these technical details and base
In the various changes and modifications of following embodiment, the application technical solution claimed also may be implemented.
The first embodiment of the present invention is related to a kind of grid stimulating device, structure is as shown in Figure 1, power grid simulation dress
Setting includes: the modular multilevel matrix converter and filter being connected.The input of modular multilevel matrix converter
Side is for connecting mains supply (a, b, c), and outlet side is used to connect the input terminal of filter, and the output end of filter is for connecting
Equipment under test (not shown).Wherein, modular multilevel matrix converter is used to convert simultaneously the mains supply that the number of phases is M
Export the voltage of transformation that the number of phases is L.Mains supply is in present embodiment with three-phase mains power grid and output voltage is also with three-phase
Example is illustrated (i.e. M and L are equal to 3).By way of example and not limitation, the filter of present embodiment uses LC filter, should
Filter is made of three filter inductances and three filter capacitors, and LC filter is to modular multilevel matrix converter outlet side
Three-phase voltage be filtered respectively after export grid stimulating device three-phase output voltage (u, v, w).
Modular multilevel matrix converter includes: the bridge arm for the product that topological structure is identical and number is M and L, and
Each bridge arm is connected between the input side and outlet side of modular multilevel matrix converter with the matrix form of MXL.Wherein, right
For inputting three-phase, exporting the grid stimulating device of three-phase, every corresponding 3 bridge arms of three-phase electricity that is, will using 3 bridge arms
Every phase transformation of mains supply is changed to three-phase electricity, and transformed three-phase electricity is converged in the outlet side of modular multilevel matrix converter
It closes, so that transformed power supply is identical as the number of phases of mains supply.
As shown in Fig. 2, each bridge arm in present embodiment include: concatenation bridge arm inductance and N number of modularization level translation
Unit (abbreviation that the module in Fig. 2 is modularization level change unit).N number of modularization level converter unit in each bridge arm
Topological structure is identical, so that the design of grid stimulating device greatly simplifies.Appoint since each bridge arm can theoretically be added
It anticipates multiple modularization level converter units, so the input side and outlet side of modular multilevel matrix converter can be born
High pressure, therefore powerful power converter may be implemented in the grid stimulating device.
As shown in figure 3, each modularization level converter unit includes 4 full controls of module capacitance and composition H bridge structural unit
Type device, module capacitance are connected to H bridge structural unit.Therefore, each modularization level converter unit is a single-phase full bridge
Converter so that modular multilevel matrix converter can be realized four quadrant running, and then can be realized energy feedback.
In present embodiment, N is positive integer, and the output voltage of grid stimulating device and the size of N are positively correlated.That is, bridge arm
In modularization level converter unit quantity it is more, the output voltage that grid stimulating device is capable of providing is higher.Also, this reality
Mode is applied using modular construction, reduces the complexity of grid stimulating device design.In addition, present embodiment is improving output
Make the overall volume of grid stimulating device can be bright compared with the three-phase transformer for providing identical output power while voltage
It is aobvious to reduce.
It is more that present embodiment multiplies the L identical bridge arm comprising modules of topology in terms of existing technologies, by M
Level matrix converter converts mains supply, allows the output voltage of grid stimulating device with the mould in each bridge arm
The increase of the quantity of block level translation unit and improve.Therefore, present embodiment provides for the simulation of high-power power grid
A kind of preferable implementation.
Second embodiment of the present invention is related to a kind of control method of grid stimulating device, for controlling as first implements
The output voltage of grid stimulating device described in mode, process are as shown in Figure 4.
As shown in figure 4, the control method of the grid stimulating device of present embodiment includes:
Step 401: according to the output reference voltage of modular multilevel matrix converter, control obtains modular multilevel
The bridge arm reference voltage of each bridge arm in matrix converter.
Wherein, step 401 includes following sub-step:
Sub-step 4011: carrying out input current control to the input side electric current of modular multilevel matrix converter, so that
The input side electric current of modular multilevel matrix converter is equal to input current reference value.
As shown in figure 5, the acquisition of input current reference value includes: that the first difference is calculated, wherein the first difference is mould
All modularization level in the capacitance voltage reference value and modular multilevel matrix converter of block multilevel matrix converter
The difference of the capacitance voltage average value of converter unit.To the first difference carry out global capacitor voltage balance control to obtain modularization it is how electric
The input current reference value of flat matrix converter.Wherein, global capacitor voltage balance control, so that modular multilevel matrix becomes
The capacitance voltage average value of all modularization level converter units is equal to the capacitor of modular multilevel matrix converter in parallel operation
Voltage reference value.
Sub-step 4012: carrying out output current control to the outlet side electric current of modular multilevel matrix converter, so that
The outlet side electric current of modular multilevel matrix converter is equal to output current reference value.
As shown in fig. 6, the acquisition of output current reference value includes: that the second difference is calculated, the second difference is power grid mould
The output voltage reference value of quasi- device and the difference of output voltage.Second difference is carried out to obtain modularization after output voltage control
The output current reference value of multilevel matrix converter.
Sub-step 4013: circulation control is carried out to the circulation of modular multilevel matrix converter, so that how electric modularization is
Circulation inside flat matrix converter is equal to circulation reference value.
As shown in fig. 7, the acquisition of circulation reference value includes: the module to each bridge arm of modular multilevel matrix converter
Capacitance voltage average value carry out the control of bridge arm capacitor voltage balance, and to the input side of modular multilevel matrix converter with
And outlet side electric current carries out module capacitance voltage fluctuation and inhibits control, obtains the circulation reference of modular multilevel matrix converter
Value.Wherein, bridge arm capacitor voltage balance control so that in modular multilevel matrix converter each bridge arm module capacitance voltage
Average value is equal to the capacitance voltage average value of all modularization level converter units in modular multilevel matrix converter.Module
Voltage fluctuation of capacitor inhibits control, so that the module capacitance voltage fluctuation that modular multilevel matrix converter occurs is pressed down
System.
Sub-step 4014: it controls to obtain the bridge arm of each bridge arm by input current control, output current control and circulation
Voltage reference value.
Step 402: obtaining the capacitance voltage of all modularization level converter units in modular multilevel matrix converter.
Wherein, the capacitance voltage of each modularization level converter unit can be collected by voltage sensor.
Step 403: according to each modularization in the bridge arm reference voltage and modular multilevel matrix converter of each bridge arm
The capacitance voltage of level translation unit, control obtain the module voltage reference value of each modularization level converter unit.
Wherein, step 403 includes:
Sub-step 4031: being averaged for the bridge arm reference voltage of each bridge arm in modular multilevel matrix converter is calculated
Value.
Sub-step 4032: respectively to the capacitor electricity of modularization level converter unit each in modular multilevel matrix converter
Pressure carries out module capacitance voltage balancing control, obtains the module voltage reference value of each modularization level converter unit.
Wherein, module capacitance voltage balancing control, so that each modularization level becomes in modular multilevel matrix converter
The capacitance voltage for changing unit is equal to the capacitance voltage average value of each modularization level converter unit place bridge arm.
Step 404: passing through the reference electricity of modularization level converter unit each in modulation module multilevel matrix converter
Pressure is to control the output voltage of simulating grid device.
Present embodiment by control grid stimulating device in each modularization level converter unit output voltage to
The output voltage of grid stimulating device is controlled, therefore can be with the voltage dip, voltage flicker, voltage of the high-power power grid of simulated high-pressure
The various power grid abnormal operations such as distortion and Voltage unbalance, set for equipment of generating electricity by way of merging two or more grid systems, power energy storage equipment, power transmission
The research and test of standby and Electric Drive equipment etc. are provided convenience.
The step of various methods divide above, be intended merely to describe it is clear, when realization can be merged into a step or
Certain steps are split, multiple steps are decomposed into, as long as comprising identical logical relation, all in the protection scope of this patent
It is interior；To adding inessential modification in algorithm or in process or introducing inessential design, but its algorithm is not changed
Core design with process is all in the protection scope of the patent.
It will be appreciated by those skilled in the art that implementing the method for the above embodiments is that can pass through
Program is completed to instruct relevant hardware, which is stored in a storage medium, including some instructions are used so that one
A equipment (can be single-chip microcontroller, chip etc.) or processor (processor) execute each embodiment the method for the application
All or part of the steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (8)
1. a kind of control method of grid stimulating device, which is characterized in that the grid stimulating device includes: the module being connected
Change multilevel matrix converter and filter；
The input side of the modular multilevel matrix converter is for connecting mains supply, and outlet side is for connecting the filtering
The input terminal of device；
It is L's that the modular multilevel matrix converter, which is used to be converted to the mains supply that the number of phases is M and export the number of phases,
Voltage of transformation；
The modular multilevel matrix converter includes: the bridge arm for the product that topological structure is identical and number is M and L, respectively
The bridge arm is connected between the input side and outlet side of the modular multilevel matrix converter with the matrix form that M multiplies L；
Each bridge arm includes: the bridge arm inductance and N number of modularization level converter unit of concatenation；Wherein, the grid stimulating device
The size of output voltage and the N are positively correlated, and the N is positive integer；
The control method is used to control the output voltage of the grid stimulating device, and the control method includes:
According to the output reference voltage of the modular multilevel matrix converter, control obtains the modular multilevel matrix
The bridge arm reference voltage of each bridge arm in converter；
Obtain the capacitance voltage of each modularization level converter unit in modular multilevel matrix converter；
According to each modularization level converter unit in the bridge arm reference voltage and modular multilevel matrix converter of each bridge arm
Capacitance voltage, control obtain the reference voltage of each modularization level converter unit；
By modulating the reference voltage of each modularization level converter unit in the modular multilevel matrix converter, to control
Make the output voltage of the grid stimulating device；
According to the output reference voltage of the modular multilevel matrix converter, control obtains the modular multilevel matrix
The bridge arm reference voltage of each bridge arm in converter, specifically includes:
Input current control is carried out to the input side electric current of the modular multilevel matrix converter, so that modular multilevel
The input side electric current of matrix converter is equal to input current reference value；
Output current control is carried out to the outlet side electric current of the modular multilevel matrix converter, so that modular multilevel
The outlet side electric current of matrix converter is equal to output current reference value；
Circulation control is carried out to the circulation of the modular multilevel matrix converter, so that modular multilevel matrix converter
Internal circulation is equal to circulation reference value；
By input current control, output current control and circulation control, the bridge arm reference voltage of each bridge arm is obtained.
2. the control method of grid stimulating device according to claim 1, which is characterized in that the modularization level translation
Unit includes 4 wholly-controled devices of module capacitance and composition H bridge structural unit；
The module capacitance is connected to the H bridge structural unit.
3. the control method of grid stimulating device according to claim 1, which is characterized in that according to the bridge of each bridge arm
The capacitance voltage of each modularization level converter unit, control obtain in arm reference voltage and modular multilevel matrix converter
The reference voltage of each modularization level converter unit, specifically includes:
The average value of the bridge arm reference voltage of each bridge arm in the modular multilevel matrix converter is calculated；
Module capacitance is carried out to the capacitance voltage of modularization level converter unit each in modular multilevel matrix converter respectively
Voltage balancing control obtains the reference voltage of each modularization level converter unit；
Wherein, the module capacitance voltage balancing control, so that each modularization level becomes in modular multilevel matrix converter
The capacitance voltage for changing unit, equal to the capacitance voltage average value of bridge arm where each modularization level converter unit.
4. the control method of grid stimulating device according to claim 1, which is characterized in that the input current reference value
Acquisition include:
The first difference is calculated, wherein first difference is the capacitance voltage reference value of modular multilevel matrix converter
With the difference of the capacitance voltage average value of modularization level converter units all in modular multilevel matrix converter；
Global capacitor voltage balance control is carried out to first difference, obtains the input electricity of modular multilevel matrix converter
Flow reference value；
Wherein, the global capacitor voltage balance control, so that all modularization level in modular multilevel matrix converter
The capacitance voltage average value of converter unit is equal to the capacitance voltage reference value of modular multilevel matrix converter.
5. the control method of grid stimulating device according to claim 4, which is characterized in that the output current reference value
Acquisition include:
The second difference is calculated, wherein second difference is the output voltage reference value and output voltage of grid stimulating device
Difference；
Output voltage control is carried out to second difference, obtains the output current reference of modular multilevel matrix converter
Value.
6. the control method of grid stimulating device according to claim 4, which is characterized in that the circulation reference value obtains
It takes and includes:
Bridge arm capacitor voltage balance is carried out to the module capacitance average voltage of each bridge arm of modular multilevel matrix converter
Control；
And the input side and outlet side electric current to the modular multilevel matrix converter carry out module capacitance voltage wave
It is dynamic to inhibit control, obtain the circulation reference value of the modular multilevel matrix converter.
7. the control method of grid stimulating device according to claim 6, which is characterized in that
Bridge arm capacitor voltage balance control so that in modular multilevel matrix converter each bridge arm module capacitance voltage
Average value is equal to the capacitance voltage average value of all modularization level converter units in modular multilevel matrix converter.
8. the control method of grid stimulating device according to claim 6, which is characterized in that
The module capacitance voltage fluctuation inhibits control, so that the module capacitance voltage that modular multilevel matrix converter occurs
Fluctuation is inhibited.
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| CN111293894B (en) * | 2020-03-09 | 2021-04-06 | 南京师范大学 | Capacitor voltage balance control method for modular multilevel matrix converter |
| CN112671249A (en) * | 2020-12-30 | 2021-04-16 | 国网河北省电力有限公司沧州供电分公司 | M3C control method and terminal equipment |
| CN113572382B (en) * | 2021-07-26 | 2023-01-24 | 杭州电子科技大学 | Capacitor voltage fluctuation suppression method of modular multilevel matrix converter |
| CN113676074B (en) * | 2021-08-27 | 2023-01-31 | 中南大学 | Unified control method for m x n type modular multilevel matrix converter |
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