CN112039362A - Inversion control method and system, controller, inverter and readable storage medium - Google Patents
Inversion control method and system, controller, inverter and readable storage medium Download PDFInfo
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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
- 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
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Abstract
The invention discloses an inversion control method and system, a controller, an inverter and a readable storage medium, wherein the method comprises the following steps: calculating to obtain the midpoint voltage of the three-phase bridge arm based on the newly calculated current correction given value of the three-phase output inductor and the newly detected capacitance voltage of the three-phase filter capacitor; converting the midpoint voltage of the three-phase bridge arm into three-phase output voltage based on SVPWM control; calculating to obtain zero-sequence voltage based on the three-phase output voltage, and further calculating zero-sequence current; correcting a current given value based on the zero sequence current to obtain a current correction given value; the current correction given value is compared with the detected inductive current of the three-phase output inductor to obtain a current difference value, a PWM instruction is output based on hysteresis control, and a PWM signal for controlling the three-phase bridge arm switch is generated based on the PWM instruction.
Description
Technical Field
The invention relates to the technical field of inversion, in particular to an inversion control method and system, a controller, an inverter and a readable storage medium.
Background
With the rapid development of science and technology, the requirements of people's life and production on power supply quality are higher and higher, and an inverter is the core part of power supply equipment such as an Uninterruptible Power Supply (UPS), a variable frequency power supply, a new energy power supply system and the like. Therefore, the research on the inverter, especially the research on the digitization thereof, is of great significance to the development of modern industry.
The direct current bus capacitor, the controllable switch and the output inductance capacitor are all important components in the topological structure of the inverter, and the direct current bus voltage of the inverter is selected by comprehensively considering the output capacity of the bridge arm voltage of a main circuit, the voltage withstanding capacity of a switch device, the system cost and other factors. On one hand, the voltage output capacity of a main circuit bridge arm is as large as possible so as to ensure that the design requirement is met; on the other hand, it should be as small as possible to meet the voltage withstand requirements of the switching device and to reduce the design difficulty of the machine. For an inverter applied to different grid voltage levels, for example, an inverter applied to a 380V/400V grid voltage level, if the inverter is applied to a 440V/480V grid voltage level, a direct-current side bus capacitor, a switching tube and a grid side filter capacitor are always redesigned according to different grid voltages. With the increase of the power grid voltage, the higher the voltage of the direct-current side bus capacitor is, the higher the voltage withstanding requirement of the device is, and the higher the cost of the machine is.
Disclosure of Invention
The present invention provides an inversion control method and system, a controller, an inverter, and a readable storage medium, which are used to solve the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, an inversion control method is configured to improve inverter dc bus utilization, the method comprising:
calculating to obtain the midpoint voltage of the three-phase bridge arm based on the newly calculated current correction given value of the three-phase output inductor and the newly detected capacitance voltage of the three-phase filter capacitor;
converting the midpoint voltage of the three-phase bridge arm into three-phase output voltage based on SVPWM control;
calculating to obtain zero-sequence voltage based on the three-phase output voltage, and calculating to obtain zero-sequence current based on the zero-sequence voltage;
correcting a current given value based on the zero sequence current to obtain a current correction given value;
comparing the current correction given value with the inductance current of the newly detected three-phase output inductor to obtain a current difference value;
outputting a PWM instruction required for generating a PWM signal based on hysteresis control according to the current difference;
and generating a PWM signal for controlling the three-phase bridge arm switch based on the PWM instruction.
Further, the calculating of the current correction given value based on the three-phase output inductor obtained by the latest calculation and the capacitance voltage of the three-phase filter capacitor obtained by the latest detection to obtain the midpoint voltage of the three-phase bridge arm includes:
calculating the inductance voltage of the three-phase output inductor based on the newly calculated current correction given value of the three-phase output inductor;
and superposing the calculated inductive voltage of the three-phase output inductor to the newly detected capacitive voltage of the three-phase filter capacitor to obtain the midpoint voltage of the three-phase bridge arm.
Further, the calculating the inductance voltage of the three-phase output inductor based on the newly calculated current correction set value of the three-phase output inductor includes:
and calculating the inductance voltage of the three-phase output inductor based on the following calculation formula:
wherein L represents the inductance of the output inductor,
the current representing the three-phase output inductance is corrected to a given value,
representative calculationAnd obtaining the inductance voltage of the three-phase output inductor.
Further, the calculating based on the three-phase output voltage to obtain a zero-sequence voltage and calculating based on the zero-sequence voltage to obtain a zero-sequence current includes:
and calculating to obtain zero-sequence voltage based on the following calculation formula:
calculating to obtain zero-sequence current based on the following calculation formula:
wherein, U0Represents zero sequence voltage, I0Represents zero sequence current, Ua、Ub、UcRepresents the midpoint voltage of the three-phase bridge arm, and C represents the capacitance value of the filter capacitor.
Further, the correcting the given current value based on the zero sequence current to obtain the corrected given current value includes: and superposing the zero sequence current to the current given value to obtain the current correction given value.
Further, the PWM command required for generating the PWM signal based on the hysteresis control output according to the current difference includes: and sending the current difference value into a current hysteresis control model, and outputting a PWM instruction required by generating a PWM signal by using the current hysteresis control model.
In a second aspect, an inverter control system is configured for improving inverter dc bus utilization, the system comprising:
the three-phase bridge arm midpoint voltage calculation module is used for calculating the inductance voltage of the three-phase output inductor based on the current correction given value of the three-phase output inductor obtained by latest calculation, and calculating the three-phase bridge arm midpoint voltage based on the inductance voltage obtained by calculation and the capacitance voltage of the three-phase filter capacitor detected latest;
the SVPWM control module is used for converting the midpoint voltage of the three-phase bridge arm into three-phase output voltage based on SVPWM control;
the zero-sequence current calculation module is used for calculating to obtain zero-sequence voltage based on the three-phase output voltage and calculating to obtain zero-sequence current based on the zero-sequence voltage;
the current given value correcting module corrects a current given value based on the zero sequence current to obtain the current corrected given value;
the current comparison module is used for comparing the current correction given value with the newly detected inductance current of the three-phase output inductor to obtain a current difference value;
the current hysteresis control module is used for outputting a PWM instruction required by the generation of the PWM signal based on hysteresis control according to the current difference value;
and the PWM signal generator is used for generating PWM signals for controlling the three-phase bridge arm switches based on the PWM instruction.
In three aspects, a controller is constructed comprising a processor and a memory, the memory storing a computer program which, when executed by the processor, carries out the steps of the method as set out above.
In a fourth aspect, an inverter is provided, which includes an inverter module and the inverter control system or the controller.
In a fifth aspect, a readable storage medium is constructed, storing a computer program which, when executed by a processor, implements the steps of the method as described above.
The inversion control method and system, the controller, the inverter and the readable storage medium have the following beneficial effects: in order to enable the inverter to be suitable for different power grid voltage levels, SVPWM is added into a system based on hysteresis current control, three-phase bridge arm midpoint voltage is obtained through calculation based on a current correction given value of a three-phase output inductor obtained through latest calculation and capacitance voltage of a three-phase filter capacitor detected latest, the three-phase bridge arm midpoint voltage is converted into three-phase output voltage based on SVPWM control, zero sequence voltage is obtained through calculation according to the three-phase output voltage, zero sequence current is further obtained, the current given value is corrected based on the zero sequence current and then compared with feedback inductance current, and the compared current difference value is used for outputting a PWM instruction through hysteresis control.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a simplified diagram of an inverter system topology;
FIG. 2 is a schematic diagram of an inversion control method of the present invention;
fig. 3 is a schematic diagram of the voltage waveforms across the filter capacitor.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments and specific features in the embodiments of the present invention are described in detail in the present application, but not limited to the present application, and the features in the embodiments and specific features in the embodiments of the present invention may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "connected" or "connecting" as used herein includes not only the direct connection of two entities but also the indirect connection via other entities having beneficial and improving effects.
Because the inverter requires that the actual output current of the inverter has high tracking capability on the instruction current, under the condition that a main loop and a control object are determined, the control method of the output current of the inverter has important influence on the performance and efficiency of the inverter, and hysteresis control in the control methods is one of the most common methods. In order to make the inverter suitable for different power grid voltage grades, the invention adds space vector control (SVPWM) into a control system based on hysteresis loop current, calculates a three-phase bridge arm midpoint voltage based on a current correction given value of a three-phase output inductor obtained by latest calculation and a capacitance voltage of a three-phase filter capacitor detected latest, converts the three-phase bridge arm midpoint voltage into a three-phase output voltage based on SVPWM control, calculates a zero sequence voltage according to the three-phase output voltage to further obtain a zero sequence current, compares the current correction given value with a feedback inductance current based on the zero sequence current, and uses the compared current difference value for the hysteresis loop control to output a PWM command. The inverter can be applied to higher power grid voltage only by improving the withstand voltage level of the filter capacitor in hardware.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
Referring to fig. 1, the topology of the inverter generally includes twoBus capacitor, inverter bridge and three-phase output inductor La、Lb、LcThree-phase filter capacitor Ca、Cb、Cc. The two bus capacitors are connected in series between the direct current buses, and the inverter bridge inverts direct current of the direct current buses into three-phase alternating current for output. The inverter bridge, the three-phase output inductor and the three-phase filter capacitor are all conventional structures in the inverter, and therefore, the details are not repeated here.
Referring to fig. 2, the inversion control method of the present invention is used to improve the utilization rate of the dc bus of the inverter, and the method includes:
1) current correction set value of three-phase output inductor based on latest calculation
Calculating the inductive voltage of a three-phase output inductor
In FIG. 1, the following description is made with reference to
In (1)
Represents
Specifically, the inductance voltage is calculated based on the following calculation formula
Wherein L represents the inductance of the output inductor, and the three-phase output inductor L in this embodimenta、Lb、LcThe inductance values are the same and are all L.
Referring to FIG. 1, this embodiment is a feedback control process, with current corrected set point
Actually calculated in step 6).
2) Inductance voltage based on calculation
And the latest detected capacitor voltage U of the three-phase filter capacitorCa、UCb、UCcAnd calculating to obtain the neutral point voltage U of the three-phase bridge arma、Ub、Uc；
Specifically, Ua、Ub、UcAre respectively composed of
And UCa、UCb、UCcThe superposition results, namely:
3) based on SVPWM control, the midpoint voltage U of the three-phase bridge arma、Ub、UcConvert to three-phase output Voltage U'a、U′b、U′c；
Specifically, an SVPWM module can be selected to obtain U'a、U′b、U′cHere, the SVPWM module is a standard SVPWM.
4) Based on the three-phase output voltage U'a、U′b、U′cCalculating to obtain a zero sequence voltage U0；
Specifically, the zero-sequence voltage is calculated based on the following calculation formula:
5) based onThe zero sequence voltage U0Calculating to obtain zero sequence current I0；
Specifically, the zero-sequence current is calculated based on the following calculation formula:
wherein C represents the capacitance of the filter capacitor, and the three-phase filter capacitor C in this embodimenta、Cb、CcThe capacitance values of all the capacitors are C.
6) Based on the zero sequence current I0For given value of current Irefa、Irefb、IrefcCorrecting to obtain the current correction set value
In particular, the current setpoint value Irefa、Irefb、IrefcThe current correction set value is set by a user, and in the embodiment, the current correction set value is obtained by superposing the zero-sequence current on the current set value, namely:
7) correcting the current by a given value
And the newly detected inductive current I of the three-phase output inductorLa、ILb、ILcComparing to obtain a current difference value delta ILa、ΔILb、ΔILc；
In particular, the current is corrected to a given value
Subtract I respectivelyLa、ILb、ILcNamely to obtain Delta ILa、ΔILb、ΔILcNamely:
8) according to the current difference value delta ILa、ΔILb、ΔILcAnd outputting a PWM instruction required for generating a PWM signal based on the hysteresis control, and generating a PWM signal for controlling the three-phase bridge arm switch based on the PWM instruction.
It is also mentioned above that hysteresis control is one of the most common methods, each phase has a hysteresis comparator, the loop width of the hysteresis comparator is H, and the present embodiment directly compares the current difference Δ ILa、ΔILb、ΔILcIs fed into an abc three-phase hysteresis comparator, and the input of the a phase hysteresis comparator is delta ILaThe input to the phase-b hysteretic comparator is Δ ILbThe input to the phase-c hysteretic comparator is Δ ILc。
Taking a phase hysteresis loop comparator as an example, when Δ ILaIf the current is more than H, the phase-a hysteresis comparator outputs a PWM instruction, and the PWM signal generator receives the PWM instruction and generates a PWM signal to enable the upper tube of the bridge arm corresponding to the phase a to be switched on and the lower tube to be switched off, so that the current is increased; on the contrary, when the current increases, Δ I is satisfiedLaWhen the current is less than-H, the phase-a hysteresis comparator outputs a PWM instruction, the PWM signal generator receives the PWM instruction and generates a PWM signal to enable the upper tube of the bridge arm corresponding to the phase a to be switched off and the lower tube to be switched on, and the current is reduced until the current is reduced to delta ILaIf the voltage is higher than H, the tube is connected again, the tube is disconnected again, and the process is repeated.
Referring to fig. 3, which is a voltage waveform of a grid phase voltage 220V, a port filter capacitor voltage waveform after a zero sequence voltage U0 is added, and it can be seen from the waveform that, compared with a sinusoidal waveform, a top peak value of the waveform in this embodiment is reduced due to the addition of the zero sequence voltage U0, and the machine is applicable to a higher grid voltage under the condition that a bus voltage is not changed.
Example two
Based on the same inventive concept, the embodiment discloses an inversion control system for improving the utilization rate of an inverter direct-current bus, and the system comprises:
the three-phase bridge arm midpoint voltage calculation module is used for calculating the inductance voltage of the three-phase output inductor based on the current correction given value of the three-phase output inductor obtained by latest calculation, and calculating the three-phase bridge arm midpoint voltage based on the inductance voltage obtained by calculation and the capacitance voltage of the three-phase filter capacitor detected latest;
the SVPWM control module is used for converting the midpoint voltage of the three-phase bridge arm into three-phase output voltage based on SVPWM control;
the zero-sequence current calculation module is used for calculating to obtain zero-sequence voltage based on the three-phase output voltage and calculating to obtain zero-sequence current based on the zero-sequence voltage;
the current given value correcting module corrects a current given value based on the zero sequence current to obtain the current corrected given value;
the current comparison module is used for comparing the current correction given value with the newly detected inductance current of the three-phase output inductor to obtain a current difference value;
the current hysteresis control module is used for outputting a PWM instruction required by the generation of the PWM signal based on hysteresis control according to the current difference value;
and the PWM signal generator is used for generating PWM signals for controlling the three-phase bridge arm switches based on the PWM instruction.
For more details, reference may be made to a part of the embodiments, which are not described herein again.
The above description relates to various modules. These modules typically include hardware and/or a combination of hardware and software (e.g., firmware). The modules may also include computer-readable media (e.g., non-transitory media) containing instructions (e.g., software instructions) that, when executed by a processor, perform various functional features of the present invention. Accordingly, the scope of the invention is not limited by the specific hardware and/or software characteristics of the modules explicitly mentioned in the embodiments, unless explicitly claimed. As a non-limiting example, the present invention may in embodiments be implemented by one or more processors executing software instructions. In addition, the present invention may also be implemented in an Application Specific Integrated Circuit (ASIC) and/or other hardware components. It should be noted that the above description of the various modules is divided into these modules for clarity of illustration. However, in actual implementation, the boundaries of the various modules may be fuzzy. For example, any or all of the functional modules herein may share various hardware and/or software elements. Also for example, any and/or all of the functional modules herein may be implemented in whole or in part by a common processor executing software instructions. Additionally, various software sub-modules executed by one or more processors may be shared among the various software modules. Accordingly, the scope of the present invention is not limited by the mandatory boundaries between the various hardware and/or software elements, unless explicitly claimed otherwise.
EXAMPLE III
Based on the same inventive concept, the present embodiment discloses a controller comprising a processor and a memory, the memory storing a computer program, which when executed by the processor, performs the steps of the method according to the first embodiment.
Example four
Based on the same inventive concept, the embodiment discloses an inverter, which comprises an inverter module and the control system or the controller described in the second embodiment.
EXAMPLE five
Based on the same inventive concept, the present embodiment discloses a readable storage medium storing a computer program which, when executed by a processor, performs the steps of the method according to the first embodiment.
In summary, the inversion control method and system, the controller, the inverter, and the readable storage medium of the present invention have the following advantages: in order to enable the inverter to be suitable for different power grid voltage levels, SVPWM is added into a system based on hysteresis current control, three-phase bridge arm midpoint voltage is obtained based on the SVPWM control, zero sequence voltage and zero sequence current are obtained through calculation, a current set value is corrected based on the zero sequence current and then is compared with feedback inductive current, and a compared current difference value is used for hysteresis control to output a PWM instruction.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An inversion control method is used for improving the utilization rate of a direct current bus of an inverter, and is characterized by comprising the following steps:
calculating to obtain the midpoint voltage of the three-phase bridge arm based on the newly calculated current correction given value of the three-phase output inductor and the newly detected capacitance voltage of the three-phase filter capacitor;
converting the midpoint voltage of the three-phase bridge arm into three-phase output voltage based on SVPWM control;
calculating to obtain zero-sequence voltage based on the three-phase output voltage, and calculating to obtain zero-sequence current based on the zero-sequence voltage;
correcting a current given value based on the zero sequence current to obtain a current correction given value;
comparing the current correction given value with the inductance current of the newly detected three-phase output inductor to obtain a current difference value;
outputting a PWM instruction required for generating a PWM signal based on hysteresis control according to the current difference;
and generating a PWM signal for controlling the three-phase bridge arm switch based on the PWM instruction.
2. The inversion control method according to claim 1, wherein the calculating of the three-phase bridge arm midpoint voltage based on the newly calculated current correction set value of the three-phase output inductor and the newly detected capacitance voltage of the three-phase filter capacitor includes:
calculating the inductance voltage of the three-phase output inductor based on the newly calculated current correction given value of the three-phase output inductor;
and superposing the calculated inductive voltage of the three-phase output inductor to the newly detected capacitive voltage of the three-phase filter capacitor to obtain the midpoint voltage of the three-phase bridge arm.
3. The inversion control method according to claim 2, wherein calculating the inductance voltage of the three-phase output inductor based on the current correction set value of the three-phase output inductor obtained by the latest calculation comprises:
and calculating the inductance voltage of the three-phase output inductor based on the following calculation formula:
wherein L represents the inductance of the output inductor,
the current representing the three-phase output inductance is corrected to a given value,
representing the calculated inductor voltage of the three-phase output inductor.
4. The inversion control method according to claim 1, wherein the calculating a zero-sequence voltage based on the three-phase output voltages and calculating a zero-sequence current based on the zero-sequence voltage comprises:
and calculating to obtain zero-sequence voltage based on the following calculation formula:
calculating to obtain zero-sequence current based on the following calculation formula:
wherein, U0Represents zero sequence voltage, I0Represents zero sequence current, Ua、Ub、UcRepresents the midpoint voltage of the three-phase bridge arm, and C represents the capacitance value of the filter capacitor.
5. The inversion control method according to claim 1, wherein the correcting a given current value based on the zero sequence current to obtain the corrected given current value comprises: and superposing the zero sequence current to the current given value to obtain the current correction given value.
6. An inverter control system for improving inverter dc bus utilization, the system comprising:
the three-phase bridge arm midpoint voltage calculation module is used for calculating to obtain three-phase bridge arm midpoint voltage based on the newly calculated current correction given value of the three-phase output inductor and the newly detected capacitance voltage of the three-phase filter capacitor;
the SVPWM control module is used for converting the midpoint voltage of the three-phase bridge arm into three-phase output voltage based on SVPWM control;
the zero-sequence current calculation module is used for calculating to obtain zero-sequence voltage based on the three-phase output voltage and calculating to obtain zero-sequence current based on the zero-sequence voltage;
the current given value correcting module corrects a current given value based on the zero sequence current to obtain the current corrected given value;
the current comparison module is used for comparing the current correction given value with the newly detected inductance current of the three-phase output inductor to obtain a current difference value;
the current hysteresis control module is used for outputting a PWM instruction required by the generation of the PWM signal based on hysteresis control according to the current difference value;
and the PWM signal generator is used for generating PWM signals for controlling the three-phase bridge arm switches based on the PWM instruction.
7. The inversion control system of claim 6, wherein the three-phase leg midpoint voltage calculation module comprises:
the inductance voltage calculation submodule is used for calculating the inductance voltage of the three-phase output inductor based on the current correction given value of the three-phase output inductor obtained by latest calculation;
and the three-phase bridge arm midpoint voltage calculation submodule is used for superposing the calculated inductive voltage of the three-phase output inductor to the newly detected capacitive voltage of the three-phase filter capacitor to obtain the three-phase bridge arm midpoint voltage.
8. A controller, characterized by comprising a processor and a memory, said memory storing a computer program which, when executed by the processor, carries out the steps of the method according to any one of claims 1-5.
9. An inverter comprising an inverter module and the inverter control system of claim 6 or the controller of claim 8.
10. A readable storage medium, characterized in that a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1-5.
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| CN101976967A (en) * | 2010-10-26 | 2011-02-16 | 深圳市盛弘电气有限公司 | Method for controlling balance of three-level inverter and direct current busbar voltage |
| CN106533231A (en) * | 2016-12-02 | 2017-03-22 | 中国船舶重工集团公司第七〇九研究所 | Control method for eliminating low-frequency ripple of mid-point voltage of DC of three-level inverter |
| EP3496257A1 (en) * | 2017-12-08 | 2019-06-12 | Delta Electronics (Shanghai) Co., Ltd. | Three-level circuit and control method for balancing neutral point voltage of the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976967A (en) * | 2010-10-26 | 2011-02-16 | 深圳市盛弘电气有限公司 | Method for controlling balance of three-level inverter and direct current busbar voltage |
| CN106533231A (en) * | 2016-12-02 | 2017-03-22 | 中国船舶重工集团公司第七〇九研究所 | Control method for eliminating low-frequency ripple of mid-point voltage of DC of three-level inverter |
| EP3496257A1 (en) * | 2017-12-08 | 2019-06-12 | Delta Electronics (Shanghai) Co., Ltd. | Three-level circuit and control method for balancing neutral point voltage of the same |
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