CN104158417A - Control system and method for reducing switching loss of photovoltaic grid-connected inverter - Google Patents
Control system and method for reducing switching loss of photovoltaic grid-connected inverter Download PDFInfo
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- CN104158417A CN104158417A CN201410360387.1A CN201410360387A CN104158417A CN 104158417 A CN104158417 A CN 104158417A CN 201410360387 A CN201410360387 A CN 201410360387A CN 104158417 A CN104158417 A CN 104158417A
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Abstract
The invention relates to a control system and method for reducing switching loss of a photovoltaic grid-connected inverter. The system comprises a photovoltaic grid-connected inverter, wherein the input end of the photovoltaic grid-connected inverter is connected with the output end of a photovoltaic component; the output end of the photovoltaic grid-connected inverter is connected with a power network through an LC filter circuit; the output end of the photovoltaic grid-connected inverter is simultaneously connected with a detection circuit to detect the output power value of the photovoltaic grid-connected inverter; the output end of the detection circuit is connected with the input end of a control unit; the output end of the control unit is connected with the photovoltaic grid-connected inverter; the detection circuit is used for transferring the detected output power value to the control unit for processing, and outputting a control signal to control the switching condition of a switch tube of the photovoltaic grid-connected inverter. The invention further provides a control method for the system. By detecting the output power of the photovoltaic grid-connected inverter, the switching frequency of a switch device is controlled, the switching loss is reduced, the inductance utilization rate is improved, and the purpose for improving the total harmonic distortion when overall efficiency and light loading are improved is achieved.
Description
Technical field
The present invention relates to photovoltaic combining inverter technical field, be specifically related to a kind of control system and method that reduces switching loss in photovoltaic combining inverter.
Background technology
The control of existing photovoltaic DC-to-AC converter generally adopts SPWM modulation strategy, SVPWM modulation strategy or reduces the VSVPWM modulation strategy of switching loss.Wherein in SPWM modulation strategy and SVPWM modulation strategy, the switch carrier frequency of inverter in whole service do not change, so in the time of inverter light load, under these two kinds of modulation strategies, switching loss is larger when inverter light load.Inductance in inverter generally uses ferrocart core class, and the inductance value of such inductance is inversely proportional to the size of the electric current of flowing through, and inductance value can reduce along with the increase of electric current, or increases along with reducing of electric current.In the time carrying out inverter design, for the full-load current rate of change that makes inverter reaches standard-required, the design of inductance value generally designs according to the fully loaded situation of inverter.And at inverter during in underloading, the inductance value in the relative inverter light load situation of inductance settings is larger, so the inductance value of inverter under undercapacity operating mode is larger, the utilance of inductance is lower.And the VSVPWM modulation strategy of reduction switching loss, in inverter whole service process, switching tube only in a period of time section switch remain unchanged, in section, the frequency of switching tube changes At All Other Times, thereby reach the object reducing the wastage, but this modulation strategy makes the low-order harmonic amount of inverter output current larger, exports total percent harmonic distortion variation.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the invention provides a kind of control system and method that reduces switching loss in photovoltaic combining inverter, by the switching frequency of the detection control switch device to photovoltaic DC-to-AC converter power output, reduce switching loss and improve inductance utilance, in the situation that not affecting the total percent harmonic distortion of output, reach the object that improves overall efficiency.
For reaching above object, the present invention adopts following technical scheme:
A kind of control system that reduces switching loss in photovoltaic combining inverter, comprise photovoltaic combining inverter, the input of described photovoltaic combining inverter is connected with the output of photovoltaic module, the output of described photovoltaic combining inverter is connected with electrical network by LC filter circuit, the output of described photovoltaic combining inverter is connected with testing circuit simultaneously, for detection of the output power value of photovoltaic combining inverter, the output of described testing circuit is connected with the input of control unit, and the output of described control unit connects photovoltaic combining inverter; Described testing circuit sends the output power value detecting to control unit, is processed by control unit, then exports control signal and control the on off state of switching tube in photovoltaic combining inverter.
The control method of control system described above, comprises the steps:
Step 1: the power output of photovoltaic combining inverter is divided into N power section according to the requirement of photovoltaic combining inverter efficiency and total percent harmonic distortion, set corresponding switch carrier frequency value to each power section simultaneously, make power output and switch carrier frequency and be worth corresponding allocation list, as shown in table 1 below;
Table 1
The explanation of his-and-hers watches 1:
When the power output of photovoltaic combining inverter is divided into two power sections, i.e. (0,1/2P
n) and (1/2P
n, P
n), the frequency of opening the corresponding each power section of carrier frequency of inverter is respectively 1/2f
nand f
n, work as the power output 0≤P<1/2P of inverter
ntime, the switch carrier frequency of photovoltaic combining inverter is 1/2f
n, as the power output 1/2P of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
When the power output of photovoltaic combining inverter is divided into three power sections, i.e. (0,1/3P
n), (1/3P
n, 2/3P
n) (2/3P
n, P
n) time, the frequency of opening the corresponding each power section of carrier frequency of photovoltaic combining inverter is respectively 1/3f
n, 2/3f
n, f
n, work as the power output 0≤P<1/3P of inverter
ntime, the switch carrier frequency of inverter is 1/3f
n, as the power output 1/3P of inverter
n≤ P<2/3P
ntime, the switch carrier frequency of inverter is 2/3f
n, as the power output 2/3P of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
When photovoltaic combining inverter power output is divided into n power section, i.e. (0,1/nP
n), (1/nP
n, 2/nP
n) ... ((n-1)/nP
n, P
n), the frequency of opening the corresponding each power section of carrier frequency of inverter is respectively 1/nf
n, 2/nf
n..., (n-1)/nf
n, f
n, work as the power output 0≤P<1/nP of inverter
ntime, the switch carrier frequency of inverter is 1/nf
n, as the power output 1/nP of inverter
n≤ P<2/nP
ntime, the switch carrier frequency of inverter is 2/nf
n, after the switching frequency of each power section, until as power output (the n-1)/nP of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
Step 2: testing circuit detects the power output of photovoltaic combining inverter;
Step 3: testing circuit sends the output power value detecting to control unit, control unit, according to the allocation list in step 1, is selected corresponding switch carrier frequency value according to performance number;
Step 4: the driving signal that control unit sends corresponding frequency according to selected switch carrier frequency value to switching tube carrys out the conducting of control switch pipe.
The present invention mainly utilizes the relation between inductance value and load, loss and switching frequency, changes and sends out ripple modulation strategy.Photovoltaic DC-to-AC converter power output is detected, select corresponding switch carrier frequency value according to inverter output power value, make inverter under different power outputs, the switch carrier frequency of inverter matches with it, finally reaches the object that reduces switching tube loss; In addition, according to the characteristic of the inverse relation of inductance value and electric current, in the time of the power reduction of inverter, the switch carrier frequency of inverter and then reduces accordingly, and this adjustment makes the voltage on inductance
remain unchanged, thereby inductance all can be fully used in different power output situations.
Brief description of the drawings
Fig. 1 is control system structural representation of the present invention.
Fig. 2 is control method flow chart of the present invention.
Fig. 3 is the waveform of embodiment 1 inverter switching tube drive waveforms and inductive current in different output power situation.
Fig. 4 is the waveform of embodiment 2 inverters switching tube drive waveforms and inductive current in different output power situation.
Fig. 5 is the waveform of embodiment 3 inverters switching tube drive waveforms and inductive current in different output power situation.
Fig. 6 is the graph of relation of inverter inductor amount and output current.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of control system that reduces switching loss in photovoltaic combining inverter of the present invention, comprise photovoltaic combining inverter, the input of described photovoltaic combining inverter is connected with the output of photovoltaic module, the output of described photovoltaic combining inverter is connected with electrical network by LC filter circuit, the output of described photovoltaic combining inverter is connected with testing circuit simultaneously, for detection of the output power value of photovoltaic combining inverter, the output of described testing circuit is connected with the input of control unit, the output of described control unit connects photovoltaic combining inverter, described testing circuit sends the output power value detecting to control unit, is processed by control unit, then exports control signal and control the on off state of switching tube in photovoltaic combining inverter.
Be illustrated in figure 2 the control method that adopts control system shown in Fig. 1, comprise the steps:
Step 1: the power output of photovoltaic combining inverter is divided into N power section according to the requirement of photovoltaic combining inverter efficiency and total percent harmonic distortion, set corresponding switch carrier frequency value to each power section simultaneously, make power output and switch carrier frequency and be worth corresponding allocation list, as shown in table 1 below;
Table 1
Step 2: testing circuit detects the power output of photovoltaic combining inverter;
Step 3: testing circuit sends the output power value detecting to control unit, control unit, according to the allocation list in step 1, is selected corresponding switch carrier frequency value according to performance number;
Step 4: the driving signal that control unit sends corresponding frequency according to selected switch carrier frequency value to switching tube carrys out the conducting of control switch pipe.
The relation of inverter power output and switch carrier frequency:
In the time that power output is P, carrier frequency f
sthe pass corresponding with power output is:
Wherein: P
n: output rated power, f
ncorresponding carrier switch frequency when rated power;
(1) formula has been described the linear relationship of inverter power output and inverter switching device pipe carrier frequency above, and in practice, digital circuit realizes for the convenience realizing can adopt the method for segmentation, can make like this to control to be simply convenient to realize; In the time that the carrier frequency of switching tube is divided into a lot of frequency bands, what can be similar to thinks linear change.For example:
Carrier frequency is divided into two sections: when the power output of inverter is 1/2P
n≤ P≤P
ntime, the carrier frequency of switching tube is f
n, when the power output of inverter is 0≤P < 1/2P
ntime, the carrier frequency of switching tube is 1/2f
n;
When the power output of inverter is divided into other quantity section, similar when the computational methods of the switch carrier frequency of each power section correspondence and two sections.
Three sections: (P
n2/3P
n1/3P
n) → (f
n2/3f
n1/3f
n)
Four sections: (P
n3/4P
n2/4P
n1/4P
n) → (f
n3/4f
n2/4f
n1/4f
n)
……
N section:
Embodiment 1
The power output of inverter is divided into two power sections, i.e. (0,1/2P
n) and (1/2P
n, P
n), the frequency of opening the corresponding each power section of carrier frequency of inverter is respectively 1/2f
nand f
n, work as the power output 0≤P<1/2P of inverter
ntime, the switch carrier frequency of inverter is 1/2f
n, as the power output 1/2P of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
As shown in Figure 3, be the waveform of inverter switching tube drive waveforms and inductive current in different output power situation.In figure:
I
1: for the power output of inverter is 1/2P
n≤ P<P
ntime, inductive current waveform
I
2: for the power output of inverter is 0≤P<1/2P
ntime, inductive current waveform
D
1: for the power output of inverter is 1/2P
n≤ P<P
ntime, the drive waveforms of switching tube in inverter
D
2: for the power output of inverter is 0≤P<1/2P
ntime, the drive waveforms of switching tube in inverter
As can be seen from Figure 3, when the power output of inverter is greater than 1/2P
ntime, the drive waveforms of switching tube is D
1, when the power output of inverter is less than 1/2P
ntime, the drive waveforms of switching tube is D
2, wherein the frequency of D2 waveform is D
1the half of waveform frequency, so the switching loss of inverter in the time of underloading is the half of full load, changes the carrier frequency of switching tube according to the difference of the power output of inverter, can effectively reduce switching loss.I
1and I
2for the waveform of the inductive current under different capacity, inductive current I
2frequency be inductive current I
1the half of frequency, but in two current waveforms, the variable quantity of electric current is identical, so the output ripple voltage of final inverter is identical, thereby inductance is fully used in the time of underloading.
Embodiment 2
Inverter power output is divided into three power sections, i.e. (0,1/3P
n), (1/3P
n, 2/3P
n) (2/3P
n, P
n) time, the frequency of opening the corresponding each power section of carrier frequency of photovoltaic combining inverter is respectively 1/3f
n, 2/3f
n, f
n, work as the power output 0≤P<1/3P of inverter
ntime, the switch carrier frequency of inverter is 1/3f
n, as the power output 1/3P of inverter
n≤ P<2/3P
ntime, the switch carrier frequency of inverter is 2/3f
n, as the power output 2/3P of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
As shown in Figure 4, be the waveform of inverter switching tube drive waveforms and inductive current in different output power situation.In figure:
I
1: for the power output of inverter is 2/3P
n≤ P<P
ntime, inductive current waveform
I
2: for the power output of inverter is 1/3P
n≤ P<2/3P
ntime, inductive current waveform
I
3: for the power output of inverter is 0≤P<1/3P
ntime, inductive current waveform
D
1: for the power output of inverter is 2/3P
n≤ P<P
ntime, the drive waveforms of switching tube in inverter
D
2: for the power output of inverter is 1/3P
n≤ P<2/3P
ntime, the drive waveforms of switching tube in inverter
D
2: for the power output of inverter is 0≤P<1/3P
ntime, the drive waveforms of switching tube in inverter
Embodiment 3
Inverter power output is divided into n power section, i.e. (0,1/nP
n), (1/nP
n, 2/nP
n) ... ((n-1)/nP
n, P
n), the frequency of opening the corresponding each power section of carrier frequency of inverter is respectively 1/nf
n, 2/nf
n..., (n-1)/nf
n, f
n, work as the power output 0≤P<1/nP of inverter
ntime, the switch carrier frequency of inverter is 1/nf
n, as the power output 1/nP of inverter
n≤ P<2/nP
ntime, the switch carrier frequency of inverter is 2/nf
n, after the switching frequency of each power section, until as power output (the n-1)/nP of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
As shown in Figure 5, be the waveform of inverter switching tube drive waveforms and inductive current in different output power situation.In figure:
I
1: for the power output of inverter is (n-1)/nP
n≤ P<P
ntime, inductive current waveform
I
2: for the power output of inverter is (n-2)/nP
n≤ P< (n-1)/nP
ntime, inductive current waveform
.................
I
n: for the power output of inverter is 0≤P<1/nP
ntime, inductive current waveform
D
1: for the power output of inverter is (n-1)/nP
n≤ P<P
ntime, the drive waveforms of switching tube in inverter
D
2: for the power output of inverter is (n-2)/nP
n≤ P< (n-1)/nP
ntime, the drive waveforms of switching tube in inverter
...................
Dn: for the power output of inverter is 0≤P<1/nP
ntime, the drive waveforms of switching tube in inverter
As shown in Figure 6, be the graph of relation of inverter inductor amount and output current.Inductance value reduces along with the increase of output current.Therefore, in the situation that output current is less, reactor sensibility reciprocal is larger, ensureing, under the condition that ripple current is constant, can to reduce switching frequency, improves inductance utilance, reduces switching loss, raises the efficiency.
Ex1. power being divided into two sections controls, if full-load power is 20kW, in the time of power output 10kW≤P<20kW, it is nominal operation frequency 16kHz that switching frequency is set, in the time of power output 0kW≤P<10kW, it is 8kHz that switching frequency is set.
Ex2. power being divided into four sections controls, if full-load power is 20kW, in the time that input power is greater than 15kW and is less than 20kW, it is nominal operation frequency 16kHz that switching frequency is set, in the time that input power is greater than 10kW and is less than 15kW, it is 12kHz that switching frequency is set, in the time that input power is greater than 5kW and is less than 10kW, it is 8kHz that switching frequency is set, in the time that input power is greater than 0kW and is less than 5kW, it is 4kHz that switching frequency is set
Ex3 is linear to be adjusted, if full-load power is 20kW, and nominal operation frequency 16kHz, the pass of switching frequency setting and power output is
in the time that power output changes, corresponding different switching frequencies.
Claims (2)
1. one kind is reduced the control system of switching loss in photovoltaic combining inverter, comprise photovoltaic combining inverter, the input of described photovoltaic combining inverter is connected with the output of photovoltaic module, the output of described photovoltaic combining inverter is connected with electrical network by LC filter circuit, it is characterized in that: the output of described photovoltaic combining inverter is connected with testing circuit simultaneously, for detection of the output power value of photovoltaic combining inverter, the output of described testing circuit is connected with the input of control unit, the output of described control unit connects photovoltaic combining inverter, described testing circuit sends the output power value detecting to control unit, is processed by control unit, then exports control signal and control the on off state of switching tube in photovoltaic combining inverter.
2. the control method of control system described in employing claim 1, is characterized in that: comprise the steps:
Step 1: the power output of photovoltaic combining inverter is divided into N power section according to the requirement of photovoltaic combining inverter efficiency and total percent harmonic distortion, set corresponding switch carrier frequency value to each power section simultaneously, make power output and switch carrier frequency and be worth corresponding allocation list, as shown in table 1 below;
Table 1
The explanation of his-and-hers watches 1:
When the power output of photovoltaic combining inverter is divided into two power sections, i.e. (0,1/2P
n) and (1/2P
n, P
n), the frequency of opening the corresponding each power section of carrier frequency of inverter is respectively 1/2f
nand f
n, work as the power output 0≤P<1/2P of inverter
ntime, the switch carrier frequency of photovoltaic combining inverter is 1/2f
n, as the power output 1/2P of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
When the power output of photovoltaic combining inverter is divided into three power sections, i.e. (0,1/3P
n), (1/3P
n, 2/3P
n) (2/3P
n, P
n) time, the frequency of opening the corresponding each power section of carrier frequency of photovoltaic combining inverter is respectively 1/3f
n, 2/3f
n, f
n, work as the power output 0≤P<1/3P of inverter
ntime, the switch carrier frequency of inverter is 1/3f
n, as the power output 1/3P of inverter
n≤ P<2/3P
ntime, the switch carrier frequency of inverter is 2/3f
n, as the power output 2/3P of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
When photovoltaic combining inverter power output is divided into n power section, i.e. (0,1/nP
n), (1/nP
n, 2/nP
n) ... ((n-1)/nP
n, P
n), the frequency of opening the corresponding each power section of carrier frequency of inverter is respectively 1/nf
n, 2/nf
n..., (n-1)/nf
n, f
n, work as the power output 0≤P<1/nP of inverter
ntime, the switch carrier frequency of inverter is 1/nf
n, as the power output 1/nP of inverter
n≤ P<2/nP
ntime, the switch carrier frequency of inverter is 2/nf
n, after the switching frequency of each power section, until as power output (the n-1)/nP of inverter
n≤ P<P
ntime, the switch carrier frequency of inverter is f
n.
Step 2: testing circuit detects the power output of photovoltaic combining inverter;
Step 3: testing circuit sends the output power value detecting to control unit, control unit, according to the allocation list in step 1, is selected corresponding switch carrier frequency value according to performance number;
Step 4: the driving signal that control unit sends corresponding frequency according to selected switch carrier frequency value to switching tube carrys out the conducting of control switch pipe.
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|---|---|---|---|
| CN201410360387.1A CN104158417B (en) | 2014-07-25 | 2014-07-25 | A kind of control system reducing the loss of photovoltaic combining inverter breaker in middle and method |
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403182A (en) * | 2016-09-21 | 2017-02-15 | 珠海格力电器股份有限公司 | Control parameter determining method and device and control system for photovoltaic air-conditioning system |
| CN107834561A (en) * | 2017-11-24 | 2018-03-23 | 电子科技大学 | A kind of Harmonics Improving Methods of electricity generation system inverter |
| CN110943602A (en) * | 2018-09-25 | 2020-03-31 | 许继集团有限公司 | Converter switching frequency control method and control system |
| CN112019006A (en) * | 2020-08-25 | 2020-12-01 | 科华恒盛股份有限公司 | Harmonic compensation method and device of PFC circuit and terminal equipment |
| CN112737383A (en) * | 2020-12-29 | 2021-04-30 | 中国矿业大学 | Three-level NPC inverter carrier frequency ordered change inverted phase laminated pulse width modulation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851998A (en) * | 2006-05-08 | 2006-10-25 | 浙江大学 | Parallel-in inverter current control method adopting filter intermediate current feed-back |
| CN201623651U (en) * | 2010-01-22 | 2010-11-03 | 扬州晶旭电源有限公司 | Single-stage three-phase solar photovoltaic grid-connected inverter |
| JP2012010558A (en) * | 2010-06-28 | 2012-01-12 | Origin Electric Co Ltd | System interconnection power converter and method for controlling system interconnection power converter |
| CN102355003A (en) * | 2011-09-13 | 2012-02-15 | 辽宁力迅风电控制系统有限公司 | Control method and device for single-phase grid-connected photovoltaic power generation system |
| CN102751742A (en) * | 2012-07-25 | 2012-10-24 | 漳州科华技术有限责任公司 | Method for improving grid-connected performance by variable switching frequency |
| JP2014096899A (en) * | 2012-11-08 | 2014-05-22 | Mitsubishi Electric Corp | Power conversion device, and system interconnection system |
-
2014
- 2014-07-25 CN CN201410360387.1A patent/CN104158417B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851998A (en) * | 2006-05-08 | 2006-10-25 | 浙江大学 | Parallel-in inverter current control method adopting filter intermediate current feed-back |
| CN201623651U (en) * | 2010-01-22 | 2010-11-03 | 扬州晶旭电源有限公司 | Single-stage three-phase solar photovoltaic grid-connected inverter |
| JP2012010558A (en) * | 2010-06-28 | 2012-01-12 | Origin Electric Co Ltd | System interconnection power converter and method for controlling system interconnection power converter |
| CN102355003A (en) * | 2011-09-13 | 2012-02-15 | 辽宁力迅风电控制系统有限公司 | Control method and device for single-phase grid-connected photovoltaic power generation system |
| CN102751742A (en) * | 2012-07-25 | 2012-10-24 | 漳州科华技术有限责任公司 | Method for improving grid-connected performance by variable switching frequency |
| JP2014096899A (en) * | 2012-11-08 | 2014-05-22 | Mitsubishi Electric Corp | Power conversion device, and system interconnection system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403182A (en) * | 2016-09-21 | 2017-02-15 | 珠海格力电器股份有限公司 | Control parameter determining method and device and control system for photovoltaic air-conditioning system |
| WO2018054045A1 (en) * | 2016-09-21 | 2018-03-29 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system control parameter determining method and apparatus, and control system |
| CN106403182B (en) * | 2016-09-21 | 2018-11-30 | 珠海格力电器股份有限公司 | A kind of control parameter of PV air-conditioner system determines method, apparatus and control system |
| US11796194B2 (en) | 2016-09-21 | 2023-10-24 | Gree Electric Appliances, Inc. Of Zhuhai | Control parameter determining method and apparatus, and control system for photovoltaic air conditioning system |
| CN107834561A (en) * | 2017-11-24 | 2018-03-23 | 电子科技大学 | A kind of Harmonics Improving Methods of electricity generation system inverter |
| CN107834561B (en) * | 2017-11-24 | 2020-10-16 | 电子科技大学 | Harmonic wave improving method for power generation system inverter |
| CN110943602A (en) * | 2018-09-25 | 2020-03-31 | 许继集团有限公司 | Converter switching frequency control method and control system |
| CN112019006A (en) * | 2020-08-25 | 2020-12-01 | 科华恒盛股份有限公司 | Harmonic compensation method and device of PFC circuit and terminal equipment |
| CN112737383A (en) * | 2020-12-29 | 2021-04-30 | 中国矿业大学 | Three-level NPC inverter carrier frequency ordered change inverted phase laminated pulse width modulation method |
| CN112737383B (en) * | 2020-12-29 | 2022-06-07 | 中国矿业大学 | Three-level NPC inverter carrier frequency ordered change inverted phase laminated pulse width modulation method |
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