CN113381632B - Non-bridge type modular inverter and control method thereof - Google Patents
Non-bridge type modular inverter and control method thereof Download PDFInfo
- Publication number
- CN113381632B CN113381632B CN202110602924.9A CN202110602924A CN113381632B CN 113381632 B CN113381632 B CN 113381632B CN 202110602924 A CN202110602924 A CN 202110602924A CN 113381632 B CN113381632 B CN 113381632B
- Authority
- CN
- China
- Prior art keywords
- switch
- switch tube
- tube
- module
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides a non-bridge moduleThe non-bridge type modularized inverter comprises a middle switch capacitor module, a basic switch capacitor module I, a basic switch capacitor module II, a left half-bridge module and a right half-bridge module, wherein the middle switch capacitor module comprises a switch tube S 0 Switch tube S 1 Switch tube S 1 ', an electrolytic capacitor C and a diode D, wherein the circuit structures of the basic switch capacitor module I and the basic switch capacitor module II are the same; the basic switch capacitor module I comprises a switch tube S L11 Switch tube S L12 Switch tube S L13 Switch tube S L14 Switch tube S L15 And an electrolytic capacitor C L1 (ii) a Different from other topologies which adopt a tail end H bridge to obtain the bipolar output level, the non-bridge type modularized inverter realizes the bipolar level output by respectively placing the same number of BSCCs on two sides of the ISCC module, effectively reduces the voltage stress of a semiconductor device, and has huge application potential in medium-high voltage engineering.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to a non-bridge modular inverter and a control method thereof.
Background
In recent years, with the large-scale deployment of distributed generators, the DC-AC link has attracted much attention in the field of distributed power generation as an energy conversion interface between distributed energy resources and a power grid or an alternating current load. Particularly in the field of photovoltaic power generation, photovoltaic cells are low-voltage direct current sources, in practical engineering, a plurality of photovoltaic cells are often connected in series or in parallel to form a photovoltaic array, electric energy is output to a load or a power grid through a combiner box, a controller, a direct current distribution box, an inverter and an alternating current distribution box, the inverter plays a very important role in the photovoltaic array, and the performance of the inverter directly affects the stability of a power grid system.
The traditional multi-level inverter has three typical structures of a diode clamping type, a flying capacitor type and an H-bridge cascade type. Among them, the problem of balancing the capacitor voltage of the diode-clamped and flying capacitor-type multilevel inverters is the most concerned, which makes the modulation work of the inverters complicated; the H-bridge cascaded multilevel inverter requires a large number of isolated dc voltage sources, which limits its use in many single power application scenarios.
In order to adapt to the development requirement in the field of new energy and overcome the defects of the traditional multi-level inverter, the switched capacitor technology with the advantages of independent boosting, self-balancing of capacitor voltage and the like is applied to the multi-level inverter.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a non-bridge modular inverter and a control method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a non-bridge modular inverter disposed in a DC power source V dc The circuit structure of the basic switched capacitor module I is the same as that of the basic switched capacitor module II;
the middle switch capacitor module comprises a switch tube S 0 Switch tube S 1 Switch tube S 1 ', an electrolytic capacitor C, and a diode D, wherein,
the switch tube S 1 Drain electrodes of the two are respectively connected with a direct current power supply V dc And the anode of the diode D and the cathode of the diode D are connected withSwitch tube S 0 Source electrode of, the switching tube S 0 The drain electrode of the capacitor C is connected with the anode of an electrolytic capacitor C, and the cathode of the electrolytic capacitor C is respectively connected with the switch tube S 1 Source electrode of and the switching tube S 1 ' of said switching tube S 1 ' the source of the transistor is connected with a DC power supply V dc The negative electrode of (1);
the basic switch capacitor module I comprises a switch tube S L11 Switch tube S L12 Switch tube S L13 And a switch tube S L14 Switch tube S L15 And an electrolytic capacitor C L1 ，
The switch tube S L11 Are respectively connected with the switch tube S L13 And the switching tube S L14 Source electrode of, the switching tube S L11 Is connected with the electrolytic capacitor C L1 The anode of (1); the switch tube S L12 Is connected with the electrolytic capacitor C L1 The switching tube S L12 Are respectively connected with the switch tube S L15 And the switching tube S L13 A source electrode of (a); the switch tube S L14 Is respectively connected with the cathode of a diode D in the middle switch capacitor module and the switch tube S 0 A source electrode of (a); the switch tube S L15 Are respectively connected with a direct current power supply V dc And a switching tube S in the intermediate switch capacitor module 1 ' the source electrode;
the basic switch capacitor module II comprises a switch tube S R11 Switch tube S R12 And a switch tube S R13 Switch tube S R14 And a switch tube S R15 And an electrolytic capacitor C R1 ，
The switch tube S R11 Are respectively connected with the switch tube S R13 And the switching tube S R14 Source electrode of, the switching tube S R11 Is connected with the electrolytic capacitor C R1 The anode of (1); the switch tube S R12 Is connected with the electrolytic capacitor C R1 The switching tube S R12 Are respectively connected with the switch tube S R15 And the switching tube S R13 Source electrode of(ii) a The switch tube S R14 Is respectively connected with the anode of the electrolytic capacitor C in the middle switch capacitor module and the switch tube S 0 A drain electrode of (1); the switch tube S R15 Are respectively connected with a direct current power supply V dc And a switching tube S in the intermediate switch capacitor module 1 ' the source electrode;
the left half-bridge module comprises a switch tube S 01 And a switching tube S 02 ，
The switch tube S 01 Drain electrodes of the two switches are respectively connected with a switch tube S in the middle switch capacitor module L11 Drain electrode and electrolytic capacitor C L1 The switching tube S 01 Is connected with the switching tube S 02 Of the switching tube S 02 The source electrodes of the intermediate switch capacitor modules are respectively connected with a switch tube S in the intermediate switch capacitor module L12 Source electrode and electrolytic capacitor C L1 A cathode of (a);
the right half bridge module comprises a switch tube S 03 And a switching tube S 04 ，
The switch tube S 03 The drain electrodes of the intermediate switch capacitor modules are respectively connected with a switch tube S in the intermediate switch capacitor module R11 Drain electrode and electrolytic capacitor C R1 The switching tube S, the switching tube S 03 Is connected with the switching tube S 04 A drain electrode of (1); the switch tube S 04 The source electrodes of the two-way switch are respectively connected with a switch tube S in the middle switch capacitor module R12 Source electrode and electrolytic capacitor C R1 A cathode of (a);
and the middle point of the left half-bridge module and the right half-bridge module is used as an alternating current voltage output end of the non-bridge modular inverter.
A second aspect of the present invention provides a method of controlling a non-bridge modular inverter, the method comprising the steps of:
generating a drive signal by which to control the operation of the non-bridge modular inverter of any of claims 1 or 2 at 2 n+3 -3 working modes, output 2 n+3 -3 levels and the non-bridge modular inverter output voltage gain G-2 n+2 -2, wherein n represents a basic switchThe total number of the capacitor modules I.
The invention provides a non-bridge modular inverter system, which comprises an inverter and a controller, wherein the inverter is the non-bridge modular inverter.
The invention provides a non-bridge modular inverter system, which comprises an inverter and a controller, wherein the controller executes the steps of the control method of the non-bridge modular inverter when controlling the action of a switching tube in the inverter.
A fifth aspect of the invention provides a readable storage medium having stored thereon instructions which, when executed by a processor, carry out the steps of the method of controlling a non-bridge modular inverter as described above.
Compared with the prior art, the invention has prominent substantive characteristics and remarkable progress, particularly:
1) the invention provides a non-bridge type modular inverter and a control method thereof, which are different from other topologies which adopt a tail end H bridge to obtain bipolar output level, the non-bridge type modular inverter realizes bipolar level output by respectively placing the same number of basic switch capacitor modules at two sides of a middle switch capacitor module, thereby effectively reducing the voltage stress of a semiconductor device and having huge application potential in medium-high voltage engineering;
2) the non-bridge modular inverter is expandable, the number of output voltage levels is increased by adding the same number of basic switch capacitor modules on two sides of the middle switch capacitor module, and the output gain of the inverter is improved;
3) the expansion module circuit of the non-bridge type modular inverter is simple in structure, can output more levels with fewer devices, effectively reduces the use of the devices and reduces the cost of a system; the capacitor voltage of the non-bridge type modularized inverter can be self-balanced, an additional capacitor voltage control loop is avoided, and a modulation strategy is simplified.
Drawings
FIG. 1 is a schematic diagram of an expanded non-bridge modular inverter;
FIG. 2 is a schematic diagram of a non-bridge modular inverter having 1 basic switched capacitor module I and 1 basic switched capacitor module II;
FIG. 3 is a schematic diagram of an operation mode I of the non-bridge type modular inverter shown in FIG. 2;
FIG. 4 is a schematic diagram of an operation mode II of the non-bridge type modular inverter shown in FIG. 2;
FIG. 5 is a schematic diagram of an operation mode III of the non-bridge type modular inverter shown in FIG. 2;
FIG. 6 is a schematic diagram of an operating mode IV of the unbridged modular inverter of FIG. 2;
fig. 7 is an operation schematic diagram of an operation mode v of the non-bridge modular inverter in fig. 2;
FIG. 8 is a schematic diagram of the operating mode VI of the unbridged modular inverter of FIG. 2;
FIG. 9 is a schematic diagram of an operation mode VII of the non-bridge modular inverter shown in FIG. 2;
FIG. 10 is a schematic diagram of carrier stack pulse width modulation of the non-bridge modular inverter of FIG. 2;
FIG. 11 is a graph of half-bridge voltage waveforms for the unbridged modular inverter of FIG. 2;
fig. 12 is a waveform diagram of the output voltage and load current when the non-bridge modular inverter of fig. 2 is connected to an inductive load.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Example 1
As shown in FIG. 2, a non-bridge type modular inverter is arranged on a DC power supply V dc The circuit structure of the basic switched capacitor module I is the same as that of the basic switched capacitor module II;
the middle switch capacitor module comprises a switch tube S 0 Switch tube S 1 Switch tube S 1 ', electrolytic capacitor C and diode DWherein, in the step (A),
the switch tube S 1 Drain electrodes of the two are respectively connected with a direct current power supply V dc And the cathode of the diode D is connected with the switching tube S 0 Source electrode of, the switching tube S 0 The drain electrode of the capacitor C is connected with the anode of an electrolytic capacitor C, and the cathode of the electrolytic capacitor C is respectively connected with the switch tube S 1 Source electrode of and the switching tube S 1 ' of the switching tube S 1 ' the source of the transistor is connected with a DC power supply V dc The negative electrode of (1);
the basic switch capacitor module I comprises a switch tube S L11 Switch tube S L12 And a switch tube S L13 Switch tube S L14 Switch tube S L15 And an electrolytic capacitor C L1 ，
The switch tube S L11 Are respectively connected with the switch tube S L13 And the switching tube S L14 Source electrode of, the switching tube S L11 Is connected with the electrolytic capacitor C L1 The anode of (1); the switch tube S L12 Is connected with the electrolytic capacitor C L1 The switching tube S L12 Drain electrodes of the first and second switches are respectively connected with the switch tube S L15 And the switching tube S L13 A source electrode of (a); the switch tube S L14 Is respectively connected with the cathode of a diode D in the middle switch capacitor module and the switch tube S 0 A source electrode of (a); the switch tube S L15 Are respectively connected with a direct current power supply V dc And a switching tube S in the intermediate switch capacitor module 1 ' the source electrode;
the basic switch capacitor module II comprises a switch tube S R11 Switch tube S R12 Switch tube S R13 Switch tube S R14 Switch tube S R15 And an electrolytic capacitor C R1 ，
The switch tube S R11 Are respectively connected with the switch tube S R13 And the switching tube S R14 Source electrode of, the switching tube S R11 Is connected with the electrolytic capacitor C R1 The anode of (1); the switch tube S R12 Is connected with the electrolytic capacitor C R1 The cathode of (2), the switching tube S R12 Are respectively connected with the switch tube S R15 And the switching tube S R13 A source electrode of (a); the switch tube S R14 Is respectively connected with the anode of the electrolytic capacitor C in the middle switch capacitor module and the switch tube S 0 A drain electrode of (1); the switch tube S R15 Are respectively connected with a direct current power supply V dc And a switching tube S in the intermediate switch capacitor module 1 ' the source electrode;
the left half-bridge module comprises a switch tube S 01 And a switching tube S 02 ，
The switch tube S 01 Drain electrodes of the two switches are respectively connected with a switch tube S in the middle switch capacitor module L11 Drain electrode and electrolytic capacitor C L1 The switching tube S 01 Is connected with the switching tube S 02 Of the switching tube S 02 The source electrodes of the intermediate switch capacitor modules are respectively connected with a switch tube S in the intermediate switch capacitor module L12 Source electrode and electrolytic capacitor C L1 A cathode of (a);
the right half bridge module comprises a switch tube S 03 And a switching tube S 04 ，
The switch tube S 03 Drain electrodes of the two switches are respectively connected with a switch tube S in the middle switch capacitor module R11 Drain electrode and electrolytic capacitor C R1 The switching tube S 03 Is connected with the switch tube S 04 A drain electrode of (1); the switch tube S 04 The source electrodes of the intermediate switch capacitor modules are respectively connected with a switch tube S in the intermediate switch capacitor module R12 Source electrode and electrolytic capacitor C R1 The cathode of (a);
and the middle point of the left half-bridge module and the right half-bridge module is used as an alternating current voltage output end of the non-bridge modular inverter.
It should be noted that the left half-bridge module, the basic switched capacitor module i, the middle switched capacitor module, the basic switched capacitor module ii and the right half-bridge module are connected in parallel in sequence; the inherent polarity conversion capacity of the basic switch capacitor module I and the basic switch capacitor module II achieves the purpose of polarity conversion of output level of the non-bridge type modular inverter; the left half-bridge module and the right half-bridge module are arranged on two sides of the inverter and used for finishing the output end control of the non-bridge type modularized inverter.
As shown in fig. 1, the basic switched capacitor module i and the basic switched capacitor module ii are scalable:
an expanded basic switched capacitor module I is further arranged between the left half-bridge module and the middle switched capacitor module, and an expanded basic switched capacitor module II is further arranged between the middle switched capacitor module and the right half-bridge module; the circuit structures of the expanded basic switch capacitor module I and the expanded basic switch capacitor module II are the same, and the number of the expanded basic switch capacitor modules I is equal to that of the expanded basic switch capacitor modules II.
The expanded Basic Switched Capacitor module (BSCC) i and the expanded Basic Switched Capacitor module (BSCC) ii are symmetrically arranged at two sides of the Intermediate Switched Capacitor module (ISCC).
In the expanded non-bridge type modular inverter, adjacent basic switch capacitor modules I are connected in parallel; preceding stage electrolytic capacitor C Li The anodes of the two are respectively connected with a switch tube S of a rear-stage basic switch capacitor module I L(i+1)4 Drain electrode of (2), preceding stage electrolytic capacitor C Li The cathode of the switch tube S is connected with a rear-stage basic switch capacitor module I L(i+1)5 A source electrode of (a); and the electrolytic capacitor C of the last stage basic switch capacitor module I Li Anode of the left half-bridge module is connected with a switching tube S of the left half-bridge module 01 The electrolytic capacitor C of the last stage basic switch capacitor module I Li The cathode of the left half-bridge module is connected with the switching tube S of the left half-bridge module 02 Of the substrate.
In the expanded non-bridge type modular inverter, the connection mode of the adjacent basic switched capacitor modules II is similar, and the description is omitted.
It should be noted that the same number of bases are respectively placed on both sides of the ISCC moduleBasic switched capacitor modules BSCC are used for enabling the non-bridge type modular inverter to output more levels, and the relation between the total number N of the basic switched capacitor modules I and the number N of the output levels of the non-bridge type modular inverter is as follows: n-2 n+3 -3；
The relation between the total number n of the basic switched capacitor modules I and the output voltage gain G of the non-bridge type modularized inverter is as follows: g-2 n+2 -2。
When the non-bridge type modularized inverter works, the switch tube S 1 And a switching tube S 1 ' complementary working states; switch tube S 01 And a switching tube S 02 The working states are complementary; switch tube S 03 And a switching tube S 04 The working states are complementary; switching tube SL 1n And a switching tube SR 1n Is consistent when the inverter output level is of opposite polarity.
It should be noted that the charging voltage of the electrolytic capacitor C in the intermediate switched capacitor module is the dc input voltage V dc The charging voltage of the capacitor in the basic switch capacitor module I or the basic switch capacitor module II is step voltage, the charging rated voltage of the rear-stage electrolytic capacitor is superposition of the rated voltage of the front-stage capacitor and the power supply, and the electrolytic capacitor C Ln And C Rn Having the same nominal charging voltage 2 n V dc 。
Example 2
On the basis of the non-bridge modular inverter in embodiment 1, the present embodiment provides a control method of the non-bridge modular inverter:
generating a driving signal by which to control the operation of the non-bridge modular inverter of any of claims 1 or 2 at 2 n+3 -3 working modes, output 2 n+3 -3 levels and the non-bridge modular inverter output voltage gain G-2 n+2 -2, wherein n represents the total number of basic switched-capacitor modules i.
Different from other topologies which adopt a tail end H bridge to obtain the bipolar output level, the non-bridge type modular inverter realizes the bipolar level output by respectively placing the same number of basic switch capacitor modules BSCC on two sides of the middle switch capacitor module ISCC; on the basis of the non-bridge type modular inverter in fig. 1, the number of output voltage levels and the output gain of the inverter can be increased by adding the same number of basic switched capacitor modules BSCC on both sides of the middle switched capacitor module.
When generating the drive signal, performing:
adopting a carrier wave laminated pulse width modulation technology, using a sine wave as a modulation wave and using a triangular wave as a carrier wave; modulating wave with 2 n+3 -4 carriers are compared, a high level is output in a portion where the modulated wave is larger than the carrier, and a low level is output in a portion where the modulated wave is smaller than the carrier, thereby obtaining 2 n+3 And 4 rectangular pulse signals, and logically combining the obtained rectangular pulse signals to obtain gate driving signals of the switching tubes.
Further, when the drive signal is generated, the modulation ratio M of the carrier wave to the modulation wave is determined by the modulation wave A ref And carrier A c Is determined jointly, namely:
M＝A ref /[(2 n+2 -2)×A c ]
the value range of the modulation ratio M is 0< M < 1:
when [ (j-1)/(2) n+2 -2)]≤M≤[j/(2 n+2 -2)]When j is equal to [1, 2, 3, … ], (2) n+2 -2)]The non-bridge modular inverter outputs (2 xj +1) levels.
In this embodiment, taking the non-bridge modular inverter with 1 basic switched capacitor module i and 1 basic switched capacitor module ii shown in fig. 2 as an example, the non-bridge modular inverter outputs 13 levels, which can be divided into 13 working modes in one cycle, and outputs 13 levels: +6V dc 、+5V dc 、+4V dc 、 +3V dc 、+2V dc 、+V dc 、0、-V dc 、-2V dc 、-3V dc 、-4V dc 、-5V dc 、-6V dc ；
The positive half cycle of the operation of the non-bridge modular inverter corresponds to the operation mode as shown in fig. 3 to 9.
The specific working principle analysis is as follows:
working mode I: the switch tube S L12 、S L15 、S R12 、S R15 、S 1 ′、S 02 And S 04 The other switch tubes are switched on, and at the moment, the inverter outputs bus voltage V bus Is 0:
as shown in fig. 3, in the current loop (discharge loop), the switch tube S in the basic switch capacitor module i L11 、S L12 、S L15 And a switching tube S of the left half-bridge module 01 And S 02 Are respectively subjected to gate-source voltage VGS L11 、VGS L12 、VGS L15 、VGS 01 And VGS 02 And driving, and keeping other switch tubes in a conducting or off state as shown in the figure 10. When switching tube S L11 、S L12 、S L15 、S 01 And S 02 In the alternate switching state, the inverter output states shown in fig. 3 and 4 are alternately switched.
And working mode II: the switch tube S L11 、S L14 、S R12 、S R15 、S 1 ′、S 01 And S 04 Conducting, and switching off the other switching tubes;
in the state shown in FIG. 4, the capacitor C is connected to the power supply V dc Charging in parallel, at this time, the inverter outputs bus voltage V bus Is + V dc 。
And working mode III: the switch tube S L12 、S L14 、S L15 、S R14 、S R15 、S 0 、S 1 、S 01 And S 04 Conducting, and turning off the other switching tubes; at this time, the inverter outputs a bus voltage V bus Is +2V dc ；
In the state shown in FIG. 5, the switching tube S in the inverter module circuit is in the current loop L11 、S L12 、S L15 、 S R12 、S 0 、S 1 And S 1 ' respectively subjected to gate-source voltages VGS L11 、VGS L12 、VGS L15 、VGS R12 、 VGS 0 、VGS 1 And VGS 1 ' drive, the other switching tubes remain in the on or off state as shown in fig. 10. When the switching tubes alternately switch states, the inverter output level switches between fig. 4 and fig. 5. In FIG. 5, the capacitor VC L1 And VC R1 Respectively charged by a series combination of a power supply and a capacitor C.
And working mode IV: the switch tube S L12 、S L13 、S L14 、S R12 、S R15 、S 1 ′、S 01 And S 04 The other switching tubes are switched off, and the diode D is cut off; at this time, the inverter outputs a bus voltage V bus Is +3V dc ；
As shown in fig. 6, in the current loop, the switch tube S in the inverter module circuit L13 、S L15 、 S R12 、S R14 、S 0 、S 1 And S 1 ' respectively subjected to gate-source voltages VGS L13 、VGS L15 、VGS R12 、VGS R14 、 VGS 0 、VGS 1 And VGS 1 ' drive, the other switch tube maintains the on or off state. When the switching tubes alternately switch states, the inverter output level switches between fig. 5 and fig. 6. In the state shown in FIG. 6, the capacitor C R1 And a power supply V dc Capacitor C in parallel charging and discharging circuit L1 Participating in the inverter output.
And a working mode V: the switch tube S L12 、S L14 、S L15 、S R11 、S R13 、S R15 、S 0 、S 1 、S 01 And S 04 The other switching tubes are switched off, and the diode D is cut off; inverter output bus voltage V bus Is +4V dc 。
As shown in fig. 7, in the current loop, the switch tube S in the inverter module circuit L13 、S L15 、 S R11 、S R12 、S R13 、S 0 、S 1 And S 1 ' respectively subjected to gate-source voltages VGS L13 、VGS L15 、VGS R11 、VGS R12 、VGS R13 、VGS 0 、VGS 1 And VGS 1 ' drive, the other switch tube maintains the on or off state. When the switching tubes switch states alternately, the inverter output level switches between fig. 6 and fig. 7. In the state shown in FIG. 7, the capacitor C L1 A capacitor C in the circuit charged and discharged by the series combination of the power supply and the capacitor C R1 Participating in the inverter output.
Working mode VI: the switch tube S L12 、S L13 、S L14 、S R11 、S R13 、S R15 、S 1 ′、S 01 And S 04 Conducting, and turning off the other switching tubes; inverter output bus voltage V bus Is +5V dc 。
As shown in fig. 8, in the current loop, the switch tube S in the inverter module circuit L13 、S L15 、 S 0 、S 1 And S 1 ' respectively subjected to gate-source voltages VGS L13 、VGS L15 、VGS 0 、VGS 1 And VGS 1 ' drive, the other switch tube maintains the on or off state. When the switching tubes alternately switch states, the inverter output level switches between fig. 7 and fig. 8. In the state shown in FIG. 8, the capacitor C is charged to V in parallel with the power supply dc Capacitor C in the discharge circuit L1 And C R1 Participating in the inverter output.
The working mode VII is as follows: the switch tube S L12 、S L13 、S L14 、S R11 、S R13 、S R15 、S 0 、S 1 、 S 01 And S 04 The other switching tubes are switched on, and the diode D is cut off; inverter output bus voltage V bus Is +6V dc ；
As shown in fig. 9, in the current loop, the switch tube S of the inverter module circuit 0 、S 1 And S 1 ' respectively subjected to gate-source voltages VGS 0 、VGS 1 And VGS 1 ' drive, the other switch tube maintains the on or off state. When the switch tubes are alternately switched, the output level of the inverter is switched between the output level in fig. 8 and the output level in fig. 8And (4) changing. The state shown in FIG. 9, the capacitors C, C in the discharge circuit L1 And C R1 Participating in the inverter output.
In the positive half working period, the non-bridge type modularized inverter sequentially changes from a working mode I, a working mode II, a working mode III, a working mode IV, a working mode V, a working mode VI, a working mode VII, a working mode VI, a working mode V, a working mode IV, a working mode III, a working mode II to a working mode I and outputs 0, + V dc 、+2V dc 、+3V dc 、+4V dc 、+5V dc 、+6V dc 、+5V dc 、+4V dc 、 +3V dc 、+2V dc 、+V dc 0; in order to reduce the switching frequency and reduce the loss, when the working mode is switched, the other switching tubes do not participate in the current loop except for the switching tube in the current loop which needs to be operated, so that the current state (the state in the previous working mode) can be maintained unchanged.
In a negative half working period, the non-bridge type modularized inverter sequentially changes from a working mode I, a working mode VIII, a working mode IX, a working mode X, a working mode XI, a working mode XII, a working mode XIII, a working mode XII, a working mode XI, a working mode X, a working mode IX and a working mode VIII to the working mode I, and the values are 0, -V dc 、-2V dc 、-3V dc 、-4V dc 、-5V dc 、-6V dc 、-5V dc 、-4V dc 、 -3V dc 、-2V dc 、-V dc 0; the switching states corresponding to the operating modes viii, ix, x, xi, xii, XIII are shown in the following table, and this embodiment is not described in detail.
On the basis of the non-bridge modular inverter circuit, the embodiment also provides a specific implementation mode of the driving signals of each switching tube in a carrier stacked pulse width modulation mode;
as shown in fig. 10, based on the non-bridge modular inverter in fig. 2, this embodiment further provides a specific implementation of the driving signals of the switching tubes in the carrier stacked pulse width modulation mode:
12 sets of rectangular pulse signals are obtained by comparing 12 triangular carrier waves with the same frequency (for example, 80 times the frequency of the modulation wave), the same phase and the same amplitude Ac with a sinusoidal modulation wave with the amplitude Aref, outputting a high level at a part of the modulation wave larger than the carrier wave and outputting a low level at a part of the modulation wave smaller than the carrier wave. And carrying out appropriate logic combination on the obtained rectangular pulse signals to obtain gate driving signals of each switching tube. The logical combination formula is shown in the following table:
S 1 ′＝S 1
in this embodiment, the modulation ratio M of the inverter is determined by the amplitude of the modulation wave and the amplitude of the carrier wave, that is: m ═ A ref /[6×A c ]；
The value range of the modulation ratio M is more than 0 and less than or equal to 1: when M is more than 1/6 and less than or equal to 2/6, the inverter outputs 3 levels; when M is greater than 2/6 and less than or equal to 3/6, the inverter outputs 5 levels; when M is greater than 2/6 and less than or equal to 3/6, the inverter outputs 7 levels; when M is greater than 3/6 and less than or equal to 4/6, the inverter outputs 9 levels; when M is more than 4/6 and less than or equal to 5/6, the inverter outputs 11 levels; when 5/6< M ≦ 1, the inverter outputs 13 levels.
In this embodiment, the 13-level inverter device was verified by simulation based on the modulation method, and fig. 11 and 12 are a half-bridge voltage waveform diagram and an output voltage and load current waveform diagram of the inverter resistive load, respectively. As can be seen from the simulation result, the peak voltage of the two half-bridges of the inverter is 100V, and the valley voltage is-50V, which is consistent with the theoretical analysis of the working principle of the inverter; as can be seen from the simulation result of FIG. 12, the inverter outputs 13-level voltage, the peak voltage is 150V, the inverter outputs the boost gain of 6, the load current is in a sine wave shape and lags behind the output voltage by a certain angle, and the capability of the proposed topology with inductive load is verified.
Example 3
The embodiment provides a non-bridge modular inverter system, which comprises an inverter and a controller, wherein the inverter is the non-bridge modular inverter.
The present embodiment further provides another specific implementation of the non-bridge modular inverter system, which includes an inverter and a controller, where the controller executes the steps of the control method of the non-bridge modular inverter when controlling the switching tubes in the inverter to operate.
The present embodiment presents a specific implementation of a readable storage medium, on which instructions are stored, which when executed by a processor, implement the steps of the control method of the non-bridge modular inverter as described above.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the above-described modules is only one logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated module may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the flow in the method of the embodiments described above may be implemented by a computer program, which may be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. The computer program includes computer program code, and the computer program code may be in a source code form, an object code form, an executable file or some intermediate form.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: modifications of the embodiments of the invention or equivalent substitutions for parts of the technical features are possible; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (7)
1. A non-bridge type modularized inverter arranged on a DC power supply V dc And the load, its characterized in that: the circuit comprises a middle switched capacitor module, a basic switched capacitor module I, a basic switched capacitor module II, a left half-bridge module and a right half-bridge module, wherein the basic switched capacitor module I and the basic switched capacitor module II have the same circuit structure;
the middle switch capacitor module comprises a switch tube S 0 Switch tube S 1 Switch tube S 1 ', an electrolytic capacitor C, and a diode D, wherein,
the switch tube S 1 Drain electrodes of the two are respectively connected with a direct current power supply V dc And the cathode of the diode D is connected with the switching tube S 0 Source electrode of, the switching tube S 0 The drain electrode of the capacitor C is connected with the anode of an electrolytic capacitor C, and the cathode of the electrolytic capacitor C is respectively connected with the switch tube S 1 Source electrode of and the switching tube S 1 ' of said switching tube S 1 ' Source electrode is connected with DC power supply V dc The negative electrode of (1);
the basic switch capacitor module I comprises a switch tube S L11 Switch tube S L12 Switch tube S L13 Switch tube S L14 Switch tube S L15 And an electrolytic capacitor C L1 ，
The switch tube S L11 Are respectively connected with the switch tube S L13 And the switching tube S L14 Source electrode of, the switching tube S L11 Is connected with the electrolytic capacitor C L1 The anode of (2); the switch tube S L12 Is connected with the electrolytic capacitor C L1 The cathode of (2), the switching tube S L12 Are respectively connected with the switch tube S L15 And the switching tube S L13 A source electrode of (a); the switch tube S L14 Is respectively connected with the cathode of a diode D in the middle switch capacitor module and the switch tube S 0 A source electrode of (a); the switch tube S L15 Are respectively connected with a direct current power supply V dc And a switching tube S in the intermediate switch capacitor module 1 ' the source electrode;
the basic switch capacitor module II comprises a switch tube S R11 Switch tube S R12 And a switch tube S R13 Switch tube S R14 And a switch tube S R15 And an electrolytic capacitor C R1 ，
The switch tube S R11 Respectively connected with the switch tube S R13 And the switching tube S R14 Source electrode of, the switching tube S R11 Is connected with the electrolytic capacitor C R1 The anode of (1); the switch tube S R12 Is connected with the electrolytic capacitor C R1 The switching tube S R12 Are respectively connected with the switch tube S R15 And the switching tube S R13 A source electrode of (a); the switch tube S R14 Is respectively connected with the anode of the electrolytic capacitor C in the middle switch capacitor module and the switch tube S 0 A drain electrode of (1); the switch tube S R15 Are respectively connected with a direct current power supply V dc And a switching tube S in the intermediate switch capacitor module 1 ' the source electrode;
the left half-bridge module comprises a switch tube S 01 And a switching tube S 02 ，
The switch tube S 01 The drain electrodes of the basic switch capacitor module I are respectively connected with a switch tube S L11 Drain electrode and electrolytic capacitor C L1 The switching tube S 01 Is connected with the switching tube S 02 Of the switching tube S 02 The source electrodes of the basic switch capacitor module I are respectively connected with a switch tube S L12 Source electrode and electrolytic capacitor C L1 The cathode of (a);
the right half bridge module comprises a switch tube S 03 And a switching tube S 04 ，
The switch tube S 03 Drain electrodes of the basic switch capacitor module II are respectively connected with a switch tube S in the basic switch capacitor module II R11 Drain electrode and electrolytic capacitor C R1 The switching tube S 03 Is connected with the switching tube S 04 A drain electrode of (1); the switch tube S 04 The source electrodes of the basic switch capacitor module II are respectively connected with a switch tube S R12 Source electrode and electrolytic capacitor C R1 A cathode of (a);
and the middle point of the left half-bridge module and the right half-bridge module is used as an alternating current voltage output end of the non-bridge modular inverter.
2. The non-bridge modular inverter of claim 1, wherein: an expanded basic switched capacitor module I is further arranged between the left half-bridge module and the middle switched capacitor module, and an expanded basic switched capacitor module II is further arranged between the middle switched capacitor module and the right half-bridge module;
the circuit structures of the expanded basic switch capacitor module I and the expanded basic switch capacitor module II are the same, and the number of the expanded basic switch capacitor modules I is equal to that of the expanded basic switch capacitor modules II.
3. A control method of a non-bridge modular inverter is characterized in that: generating a driving signal by which to control the operation of the non-bridge modular inverter of any of claims 1 or 2 at 2 n+3 -3 working modes, output 2 n+3 -3 levels and the non-bridge modular inverter output voltage gain G =2 n+2 -2, wherein n represents the total number of basic switched capacitor modules i.
4. The method of claim 3, wherein the generating the driving signal comprises:
adopting a carrier wave laminated pulse width modulation technology, using a sine wave as a modulation wave and using a triangular wave as a carrier wave; modulating wave with 2 n+3 -4 carriers are compared, a high level is output in a portion where the modulated wave is larger than the carrier, and a low level is output in a portion where the modulated wave is smaller than the carrier, thereby obtaining 2 n+3 And 4 rectangular pulse signals, and logically combining the obtained rectangular pulse signals to obtain gate driving signals of the switching tubes.
5. The method of claim 3, wherein the modulation ratio M of the carrier wave to the modulation wave is determined by the modulation wave A when the driving signal is generated ref And carrier A c Is determined jointly, namely:
M=A ref /[(2 n+2 -2)×A c ]
the value range of the modulation ratio M is 0< M < 1:
when [ (j-1)/(2) n+2 -2)]≤M≤[j/(2 n+2 -2)]When j is equal to [1, 2, 3, … ], (2) n+2 -2) ]The non-bridge modular inverter outputs (2 xj +1) levels.
6. A non-bridge type modularization inverter system comprises an inverter and a controller, and is characterized in that: the inverter is the non-bridge modular inverter of any of claims 1 or 2.
7. A non-bridge type modularization inverter system comprises an inverter and a controller, and is characterized in that: the steps of the method for controlling a non-bridge modular inverter according to any of claims 3-5 are performed when the controller controls the operation of the switching tubes in the inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602924.9A CN113381632B (en) | 2021-05-31 | 2021-05-31 | Non-bridge type modular inverter and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602924.9A CN113381632B (en) | 2021-05-31 | 2021-05-31 | Non-bridge type modular inverter and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113381632A CN113381632A (en) | 2021-09-10 |
| CN113381632B true CN113381632B (en) | 2022-08-26 |
Family
ID=77575098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110602924.9A Active CN113381632B (en) | 2021-05-31 | 2021-05-31 | Non-bridge type modular inverter and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113381632B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115765510A (en) * | 2022-12-15 | 2023-03-07 | 南京理工大学 | Control method of dual-port multi-level inverter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017157271A1 (en) * | 2016-03-14 | 2017-09-21 | The Hong Kong Polytechnic University | Multilevel inverters |
| CN108566108B (en) * | 2018-04-20 | 2019-10-22 | 厦门大学 | A kind of nine electrical level inverter of two-stage type based on bridge type multi-electrical level switching capacity module |
| CN109194170A (en) * | 2018-09-28 | 2019-01-11 | 华东交通大学 | A kind of seven electrical level inverters using switched-capacitor circuit |
| CN111740627B (en) * | 2020-05-30 | 2022-07-05 | 郑州大学 | Non-bridge multi-level conversion device and control method thereof |
-
2021
- 2021-05-31 CN CN202110602924.9A patent/CN113381632B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113381632A (en) | 2021-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111740625B (en) | Expansion multi-level boosting inversion topology and modulation method | |
| CN112290817B (en) | Expanded T-shaped multi-level converter topology and modulation method | |
| CN112039340B (en) | Voltage balancing topology and control method adopting bidirectional buck-boost and series LC | |
| CN108599604B (en) | Single-phase seven-level inverter and PWM signal modulation method thereof | |
| CN110572064B (en) | Composite multi-level power conversion circuit and method | |
| CN110572061B (en) | Hybrid T-type multi-level inverter and control method thereof | |
| CN113381632B (en) | Non-bridge type modular inverter and control method thereof | |
| Wang et al. | An X-type boost multilevel inverter based on switched capacitor cells with low-voltage stress and high-frequency applications | |
| CN111740624B (en) | High-gain multi-level DC/AC (direct current/alternating current) conversion topology and method | |
| Niu et al. | A novel switched-capacitor five-level T-type inverter | |
| Kim et al. | Hybrid switched-capacitor multi-level inverter for renewable energy systems | |
| CN114070108A (en) | Novel switched capacitor quasi-resonance multi-level inverter | |
| CN113258814A (en) | High-gain low-stress photovoltaic multi-level inverter and control method | |
| Jakkula et al. | A New Quadruple Boost Nine Level Inverter with Self-Voltage Balancing of Capacitors | |
| CN112290818B (en) | Cascade multilevel converter and implementation method thereof | |
| Kedika et al. | Single-phase seven-level inverter with multilevel boost converter for solar photovoltaic systems | |
| Zhu et al. | Buck-Boost type high voltage DC auxiliary power supply for medium voltage DC system | |
| CN114944776B (en) | High-gain DC-AC converter for new energy access | |
| CN114553038B (en) | Space type DC/AC converter and fault-tolerant operation method thereof | |
| JP3243978U (en) | Interconnected power grid high gain inverter for distributed energy access | |
| CN113258812B (en) | Low-stress boost inverter and implementation method thereof | |
| Babu et al. | Solar Powered Nine-Level Inverter with Reduced Switches | |
| CN114567196B (en) | DC/AC converter capable of expanding power level and method | |
| Elahi et al. | A new double boost single DC source single-phase multilevel inverter | |
| CN111740628B (en) | Distributed power generation multilevel converter and modulation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |