CN110148961A - Grid-connected system is pressed in the floating power generation of medium temperature geothermal energy magnetic based on five-level converter - Google Patents
Grid-connected system is pressed in the floating power generation of medium temperature geothermal energy magnetic based on five-level converter Download PDFInfo
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- CN110148961A CN110148961A CN201910329187.2A CN201910329187A CN110148961A CN 110148961 A CN110148961 A CN 110148961A CN 201910329187 A CN201910329187 A CN 201910329187A CN 110148961 A CN110148961 A CN 110148961A
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- 238000007667 floating Methods 0.000 title claims abstract description 46
- 238000010248 power generation Methods 0.000 title claims abstract description 22
- 230000003750 conditioning effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 241000132179 Eurotium medium Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007659 motor function Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H02J3/382—
-
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- 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
- H02M7/53871—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 with automatic control of output voltage or current
- H02M7/53873—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 with automatic control of output voltage or current with digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic based on five-level converter that the present invention provides a kind of, which includes NPC/H five-level converter, high-speed turbine pressurization magnetic bearing permanent magnet generator, DSP+FPGA control module, voltage and current acquisition module, PWM drive module.Using NPC/H five level topology, switching frequency is low, current harmonics is small, can be improved the sine degree of motor stator electric current；Magnetic bearing permanent magnet generator is pressurized using high-speed turbine, is consumed energy low, noise is small, and generating efficiency is high, is conducive to environmental protection.It is put forward for the first time to be pressurized in magnetic bearing permanent magnet generator system based on NPC/H five-level converter realization high-speed turbine and presses grid-connected, effective use medium temperature geothermal energy.
Description
Technical field
The present invention relates to technical field of power generation, and in particular, to a kind of medium temperature geothermal energy magnetic based on five-level converter
Grid-connected system is pressed in floating power generation.
Background technique
Geothermal energy resources are divided into high-temperature geothermal by temperature, and temperature is higher than 150 DEG C；Medium temperature underground heat, temperature is at 90~150 DEG C；It is low
Warm underground heat, temperature are lower than 90 DEG C.From total amount, China is mainly based on middle low-temperature geothermal resource, and geothermal energy resources are by storage
The form of depositing be divided into steam type hot-water type, die mould, lava type, xeothermic lithotype.Geothermal energy resources can be used to generate electricity, heating and refrigerating
Deng there is very big Exploitative potential.But the existing grid-connected system using geothermal energy resources, there is electricity under the conditions of low switching frequency
Stream harmonic wave is big, power quality is low.
Turbocharging is by way of compressed air come the flow for increasing high-temperature steam working medium, the rotation of impeller.
According to the similitude of magnetic bearing and conventional motors stator structure, magnetic bearing winding is repeatedly wound in conventional motors stator slot, is made
Suspension magnetic and conventional motors rotating excitation field share an iron circuit, integrate electromagnetic bearing and ordinary motor function.Magnetic
Floating axle is held suitable for high-speed motor, and high-speed permanent magnetic generator, is consumed energy low, and noise is small, and generating efficiency is high, is conducive to environmental protection.NPC/H
Five level topology, switching frequency is low, current harmonics is small, has broad prospect of application.
The prior art relevant to the application is patent document CN104037796B, is disclosed more than grid type multiloop low temperature
Heat collection is converted into mechanical energy by Organic Rankine Cycle mode and magneto alternator rotation is pushed to produce by heat generating system
Then raw AC energy is incorporated to bulk power grid or internal minor scale power net by grid-connected converter or powers for individual loads.Pass through
DSP floating-point controls the operation of chip TMS320F28335 control current transformer, is carried out by master system to whole system real-time
Monitoring and management, the failure problems in processing system, the output power for adjusting turbine are constant.When the grid fails, it remains to do
Corresponding processing out.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of based in NPC/H five-level converter
Grid-connected system is pressed in the floating power generation of warm geothermal energy magnetic.
Grid-connected system is pressed in a kind of floating power generation of the medium temperature geothermal energy magnetic based on five-level converter provided according to the present invention,
Including
Turbocharging magnetic floating generator group, NPC/H five-level converter, DSP+FPGA master control borad, voltage and current acquisition
Device；
Medium temperature underground heat generates three-phase alternating current by turbocharging magnetic floating generator group, then through five level translation of NPC/H
Device is incorporated in medium voltage network, after after voltage and current acquisition device collection voltages current signal, by DSP+FPGA master control borad into
The control of row signal.
Preferably, grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic based on five-level converter, further includes
The output end of PWM driving plate, DSP+FPGA master control borad is connected with the input terminal of PWM driving plate, the output end of PWM driving plate with
NPC/H five-level converter is connected, and PWM driving plate provides PWM drive signal for NPC/H five-level converter.
Preferably, separate unit turbocharging magnetic floating generator generates three intersections in the turbocharging magnetic floating generator group
Galvanic electricity, the three-phase alternating current are rectified into DC voltage through NPC three-level converter, the voltage string after more power generator rectifications
Straightening stream in connection formation, medium pressure direct current are incorporated in medium voltage network through NPC/H five-level converter again.
The turbocharging magnetic floating generator includes turbocharger, high-speed magnetic floating bearing permanent magnet motor；Underground heat enters
Evaporator, evaporator are connected with turbocharging, and turbocharger is connected with high-speed magnetic floating bearing permanent magnet motor.
Preferably, before the three-phase alternating current is through NPC/H five-level converter, first through NPC three-level converter, with reality
It now rectifies, the Voltage Series after more power generator rectifications form middle straightening stream；Turbocharging magnetic floating generator and NPC tri-
Level converter is connected, and NPC three-level converter is connected with capacitor, and capacitor is connected with NPC/H five-level converter.
Preferably, the voltage and current acquisition device samples conditioning plate using voltage and current, and voltage and current samples conditioning plate
It is connected with three phase network, to acquire three-phase voltage signal and three-phase current signal.
Preferably, the NPC/H five-level converter includes at least two NPC converters, and described two NPC converters are logical
It crosses single-phase bridge arm and connects and composes H bridge structure, the NPC converter is using FF300R17KE4 topology.
Preferably, the DSP+FPGA master control borad includes at least dsp processor, FPGA processor.
Preferably, the dsp processor uses TMS320F28335, and the FPGA processor uses A3P1000-
PQG208。
Preferably, the PWM driving plate includes at least active clamp circuit, miller capacitance circuit, Zener diode.
Preferably, the generation of the PWM drive signal is after being acquired by digital processing chip to voltage and current,
Carry out the double-closed-loop control operation of power outer ring current inner loop control.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, it is able to achieve the effective use of the energy using medium temperature underground heat, reduces environmental pollution；
2, using five level topology of NPC/H as grid connection topology, NPC/H five-level converter output waveform is closer to just
String wave, switching frequency is low, current harmonics is small, can be improved the sine degree of motor stator electric current；
3, magnetic bearing permanent magnet generator is pressurized using high-speed turbine, consumed energy low, noise is small, and generating efficiency is high, stability
It is good.
4, using more power generator cascades, high-power grid-connected system is pressed in building.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is system structure diagram of the invention；
Fig. 2 is five level topology schematic diagram of NPC/H of the invention；
Fig. 3 is five level circuit schematic diagram of NPC/H of the invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Grid-connected system is pressed in a kind of floating power generation of the medium temperature geothermal energy magnetic based on five-level converter provided according to the present invention,
Including turbocharging magnetic floating generator, NPC/H five-level converter, DSP+FPGA master control borad, voltage and current acquisition device；
Medium temperature underground heat generates three-phase alternating current, three-phase alternating current is through NPC tri- by separate unit turbocharging magnetic floating generator
Level converter is rectified into DC voltage.Voltage Series after more power generator rectifications form middle straightening stream, then through NPC/H
Five-level converter is incorporated in medium voltage network, after after voltage and current acquisition device collection voltages current signal, by DSP+
FPGA master control borad carries out signal control.Preferably, the underground heat is medium temperature underground heat, and the power grid is medium voltage network.
Specifically, grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic based on five-level converter, further includes
The output end of PWM driving plate, DSP+FPGA master control borad is connected with the input terminal of PWM driving plate, the output end of PWM driving plate with
NPC/H five-level converter is connected, and PWM driving plate provides PWM drive signal for NPC/H five-level converter.
Specifically, the turbocharging magnetic floating generator includes turbocharger, high-speed magnetic floating bearing permanent magnet motor；Ground
Heat enters evaporator, and evaporator is connected with turbocharging, and turbocharger is connected with high-speed magnetic floating bearing permanent magnet motor.
Specifically, grid-connected system, feature are pressed in the floating power generation of the medium temperature geothermal energy magnetic based on five-level converter
It is, it is more to realize rectification first through NPC three-level converter before the three-phase alternating current is through NPC/H five-level converter
Voltage Series after the rectification of platform power generator form middle straightening stream；Turbocharging magnetic floating generator and NPC three-level converter
It is connected, NPC three-level converter is connected with capacitor, and capacitor is connected with NPC/H five-level converter.
Specifically, the voltage and current acquisition device samples conditioning plate using voltage and current, and voltage and current samples conditioning plate
It is connected with three phase network, to acquire three-phase voltage signal and three-phase current signal.
Specifically, the NPC/H five-level converter includes at least two NPC converters, and described two NPC converters are logical
It crosses single-phase bridge arm and connects and composes H bridge structure, the NPC converter is using FF300R17KE4 topology.
Specifically, the DSP+FPGA master control borad includes at least dsp processor, FPGA processor.
Specifically, the dsp processor uses TMS320F28335, and the FPGA processor uses A3P1000-
PQG208。
Specifically, the PWM driving plate includes at least active clamp circuit, miller capacitance circuit, Zener diode.
Specifically, the generation of the PWM drive signal is after being acquired by digital processing chip to voltage and current,
Carry out the double-closed-loop control operation of power outer ring current inner loop control.
The application being unique in that in terms of concrete scheme implementation: clear application scenarios, i.e. medium temperature geother-mal power generation,
And three-phase alternating current is generated using high-speed permanent magnetic magnetic suspension generator, three-phase alternating current is rectified into directly through NPC three-level converter
Galvanic electricity pressure.Voltage Series after more power generator rectifications form middle straightening stream, then are incorporated to middle pressure through NPC/H five-level converter
In power grid, and the normal operation of current transformer is controlled as digital processing element using DSP+FPGA.Become based on five level of NPC/H
Parallel operation, which is realized, presses grid-connected, effective use medium temperature geothermal energy, at present in state in high-speed turbine pressurization magnetic bearing permanent magnet generator system
Inside it is put forward for the first time.Separate unit power generator output voltage is low, and the direct current rectified forces down, and power is small.
In specific implementation, as shown in Figure 1, realizing that the middle specific connection type of pressure grid-connected system component of the invention is as follows:
Medium temperature geothermal vapour enters evaporator 1, and evaporator 1 is connected with turbocharger 2, and 1 middle and high temperature refrigerant fluid of evaporator enters whirlpool
Booster 2 is taken turns, cryogenic fluid fluid enters evaporator 1 in turbocharger 2.Turbocharger 2 and high-speed magnetic floating bearing permanent magnetism
Generator 3 is connected, and composition high-speed turbine pressurization magnetic bearing permanent magnet generator provides three-phase alternating voltage.High-speed magnetic floating bearing is forever
Magnetic generator 3 is connected with NPC three-level converter 4, and high-speed magnetic floating bearing permanent magnet generator 3 is that NPC three-level converter 4 mentions
For three-phase alternating voltage, NPC three-level converter 4 realizes rectification function.NPC three-level converter 4 is connected with capacitor 5, maintains
DC voltage stability.It is connected after more device series connection with NPC/H five-level converter 6, is provided for NPC/H five-level converter 6
Medium voltage DC pressure.Grid-connected reactor 7 is connected with NPC/H five-level converter 6, while piezoelectricity in grid-connected reactor 7 and three-phase
Net 8 is connected, and grid-connected reactor 7 realizes inversion function.Voltage and current sampling conditioning plate 9 is connected with three-phase medium voltage network 8, acquires phase
The three-phase voltage signal and three-phase current signal answered.DSP+FPGA master control borad 10 is connected with voltage and current sampling conditioning plate 9, will
The voltage and current signal of acquisition is transmitted to DSP+FPGA master control borad 10, completes related algorithm and calculates.DSP+FPGA master control borad 10 with
PWM driving plate 11 is connected, and PWM driving plate 11 is connected with five level 6 of NPC/H, and PWM driving plate 11 is that five level 6 of NPC/H provides
PWM drive signal.
In the description of the present application, it is to be understood that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description the application is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
1. pressing grid-connected system in a kind of floating power generation of medium temperature geothermal energy magnetic based on five-level converter, which is characterized in that including whirlpool
Wheel pressurization magnetic floating generator group, NPC/H five-level converter, DSP+FPGA master control borad, voltage and current acquisition device；
Medium temperature underground heat generates three-phase alternating current by turbocharging magnetic floating generator group, then simultaneously through NPC/H five-level converter
Enter in medium voltage network, after after voltage and current acquisition device collection voltages current signal, letter is carried out by DSP+FPGA master control borad
Number control.
2. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 1 based on five-level converter,
It is characterized in that, further includes PWM driving plate, the output end of DSP+FPGA master control borad is connected with the input terminal of PWM driving plate, and PWM drives
The output end of movable plate is connected with NPC/H five-level converter, and PWM driving plate provides PWM driving letter for NPC/H five-level converter
Number.
3. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 1 based on five-level converter,
It being characterized in that, separate unit turbocharging magnetic floating generator generates three-phase alternating current in the turbocharging magnetic floating generator group,
The three-phase alternating current is rectified into DC voltage through NPC three-level converter, the Voltage Series shape after more power generator rectifications
At middle straightening stream, medium pressure direct current is incorporated in medium voltage network through NPC/H five-level converter again.
4. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 3 based on five-level converter,
It is characterized in that, the turbocharging magnetic floating generator includes turbocharger, high-speed magnetic floating bearing permanent magnet motor；
Medium temperature underground heat enters evaporator, and evaporator is connected with turbocharging, turbocharger and high-speed magnetic floating bearing permanent magnet motor
It is connected.
5. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 3 based on five-level converter,
It is characterized in that, it is whole to realize first through NPC three-level converter before the three-phase alternating current is through NPC/H five-level converter
Stream；
Turbocharging magnetic floating generator is connected with NPC three-level converter, and NPC three-level converter is connected with capacitor, capacitor
It is connected with NPC/H five-level converter.
6. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 1 based on five-level converter,
It is characterized in that, the voltage and current acquisition device samples conditioning plate using voltage and current, and voltage and current samples conditioning plate and three-phase
Power grid is connected, to acquire three-phase voltage signal and three-phase current signal.
7. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 1 based on five-level converter,
It is characterized in that, the NPC/H five-level converter includes at least two NPC converters, and described two NPC converters pass through single-phase
Bridge arm connects and composes H bridge structure, and the NPC converter is using FF300R17KE4 topology.
8. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 1 based on five-level converter,
It is characterized in that, the DSP+FPGA master control borad includes at least dsp processor, embedded IC plate.
9. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 1 based on five-level converter,
It is characterized in that, the dsp processor uses TMS320F28335, and the FPGA processor uses A3P1000-PQG208.
10. grid-connected system is pressed in the floating power generation of the medium temperature geothermal energy magnetic according to claim 2 based on five-level converter,
It is characterized in that, the PWM driving plate includes at least active clamp circuit, miller capacitance circuit, Zener diode；The PWM drives
The generation of dynamic signal is to carry out power outer ring current inner loop control after being acquired by digital processing chip to voltage and current
Double-closed-loop control operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329187.2A CN110148961A (en) | 2019-04-23 | 2019-04-23 | Grid-connected system is pressed in the floating power generation of medium temperature geothermal energy magnetic based on five-level converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329187.2A CN110148961A (en) | 2019-04-23 | 2019-04-23 | Grid-connected system is pressed in the floating power generation of medium temperature geothermal energy magnetic based on five-level converter |
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| CN110148961A true CN110148961A (en) | 2019-08-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259286A (en) * | 2013-05-06 | 2013-08-21 | 安徽理工大学 | Three-level Z source wind power generation grid-connected system |
| CN104196585A (en) * | 2014-09-02 | 2014-12-10 | 叶金辉 | Magnetic-levitation ORC low-grade waste heat power generation system |
| CN104578816A (en) * | 2014-12-23 | 2015-04-29 | 西安交通大学 | Clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms |
| CN105587427A (en) * | 2016-03-18 | 2016-05-18 | 中国科学院工程热物理研究所 | Engine waste heat recovery power generation system based on organic Rankine cycle |
| CN108123612A (en) * | 2016-11-29 | 2018-06-05 | 杨晶 | A kind of five-level converter control system based on three-level topology circuit |
-
2019
- 2019-04-23 CN CN201910329187.2A patent/CN110148961A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259286A (en) * | 2013-05-06 | 2013-08-21 | 安徽理工大学 | Three-level Z source wind power generation grid-connected system |
| CN104196585A (en) * | 2014-09-02 | 2014-12-10 | 叶金辉 | Magnetic-levitation ORC low-grade waste heat power generation system |
| CN104578816A (en) * | 2014-12-23 | 2015-04-29 | 西安交通大学 | Clamp five-level back-to-back converter with flying capacitor auxiliary bridge arms |
| CN105587427A (en) * | 2016-03-18 | 2016-05-18 | 中国科学院工程热物理研究所 | Engine waste heat recovery power generation system based on organic Rankine cycle |
| CN108123612A (en) * | 2016-11-29 | 2018-06-05 | 杨晶 | A kind of five-level converter control system based on three-level topology circuit |
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