CN113300614A - Novel ultra-sparse matrix converter topological structure containing gamma source circuit - Google Patents
Novel ultra-sparse matrix converter topological structure containing gamma source circuit Download PDFInfo
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- CN113300614A CN113300614A CN202110595928.9A CN202110595928A CN113300614A CN 113300614 A CN113300614 A CN 113300614A CN 202110595928 A CN202110595928 A CN 202110595928A CN 113300614 A CN113300614 A CN 113300614A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
Abstract
The invention discloses a topological structure of a novel ultra-sparse matrix converter containing a gamma source circuit, which comprises the following components: the input filter circuit, the rectifier stage circuit, the gamma source circuit and the inverter stage circuit; the input filter circuit is used for connecting an alternating current power supply, and outputting filter voltage to the rectifier circuit; the rectifier stage circuit receives the filtering voltage, outputs a rectifying voltage and transmits the rectifying voltage to the gamma source circuit; the gamma source circuit receives the rectified voltage, outputs a boosted voltage and transmits the boosted voltage to the inverter stage circuit; the inverter stage circuit receives the boosted voltage and outputs an inverted voltage; the gamma source circuit comprises a diode, a transformer and a capacitor; the rectified voltage is transmitted to a transformer through the diode, the transformer is connected with a capacitor, and the transformer outputs boosted voltage and transmits the boosted voltage to the inverter stage circuit. A gamma source booster circuit is added in a direct current link of the traditional USMC, the output voltage of the direct current link is improved, and an inverter stage can output higher voltage, so that the voltage transmission ratio range is widened.
Description
Technical Field
The invention relates to the technical field of power electronic alternating current conversion, in particular to a novel ultra-sparse matrix converter topological structure containing a gamma source circuit.
Background
In order to reduce the number of power switches and the number of commutation times, many researchers improve and innovate an Indirect Matrix Converter (IMC) topology, and obtain an ultra-sparse Matrix Converter (USMC) with only 9 power switches. In order to improve the voltage transmission ratio of the matrix converter, only two ways of improving the modulation strategy and adjusting the topological structure exist at present.
An Overmodulation strategy of space vector modulation is proposed in 'Complex of Two over modulation structures in an index Matrix Converter' in 'IEEE Trans. on Industrial Electronics' of 60 th year 2012, although the voltage transmission ratio of the USMC can be improved within a certain range, the algorithm is complex to realize and the output harmonic is large. Detailed analysis is carried out on USMC modeling simulation in a text of control strategy and simulation analysis of ultra-sparse matrix converter in 'electric power science and technology academy' of 33 th in 2018, output voltage waveforms under different output frequencies are obtained, but the voltage transmission ratio is limited by the topological structure and the modulation algorithm. In the 51 st stage of power electronic technology in 2017, the Trans-quasi-Z source two-stage matrix converter improves the voltage transmission ratio of the traditional bipolar matrix converter by introducing a traditional Z source, but the adjusting range of the converter has certain limitation.
Therefore, how to reduce the number of switches of the matrix converter and improve the voltage transmission ratio is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a novel ultra-sparse matrix converter topology structure with a gamma source circuit, and the gamma source circuit is added in a direct current link of the USMC to improve the output voltage of the direct current link, so that the inverter stage can output higher voltage, and the voltage transmission ratio range is widened. Furthermore, by combining with an SVPWM (space vector pulse width modulation) strategy, the voltage transmission ratio of the novel USMC topological structure is deduced, and the capacitance parameter in the gamma source circuit is improved and designed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel ultra-sparse matrix converter topology containing a gamma source circuit comprises: the input filter circuit, the rectifier stage circuit, the gamma source circuit and the inverter stage circuit;
the input filter circuit is used for connecting an alternating current power supply, and outputting filter voltage to the rectifier stage circuit; the rectification stage circuit receives the filtering voltage, outputs a rectification voltage and transmits the rectification voltage to the gamma source circuit;
the gamma source circuit receives the rectified voltage, outputs a boosted voltage and transmits the boosted voltage to the inverter stage circuit; the inverter stage circuit receives the boosted voltage and outputs an inverted voltage;
the gamma source circuit comprises a diode, a transformer and a capacitor;
the rectified voltage is transmitted to a transformer through the diode, the transformer is connected with a capacitor, and the transformer outputs boosted voltage and transmits the boosted voltage to the inverter stage circuit.
Further, the transformer is formed by coupling a first inductor and a second inductor;
the rectified voltage is transmitted to the dotted terminals of the first inductor and the second inductor respectively through the diode;
the marking end of the first inductor outputs boosted voltage and transmits the boosted voltage to the inverter stage circuit;
and the marking end of the second inductor is connected with the capacitor.
Further, the transformer turns ratio ranges from 1 to 2.
Further, the voltage transfer ratio M of the ultra-sparse matrix converter is specifically represented as:
wherein the content of the first and second substances,
b is the transformation ratio of the gamma source circuit and satisfies the condition that B is (gamma)Γ-1)/[γΓ(1-DST)-1]
Wherein U isomFor input voltage amplitude, UdcIs a direct-current voltage, and the voltage is,
for input current displacement factor, DSTIs the switching duty ratio of the gamma source circuitΓIs the transformation ratio of the gamma source circuit, is composed ofThis improves the ultra-sparse matrix converter voltage transfer ratio.
Further, capacitance parameters in the Γ source circuit are designed:
wherein D isSTIs the switching duty ratio of the gamma source circuit, ILIs the average current of the inductor, gammaΓIs the transformation ratio of the gamma source circuit, fSAnd r is the output voltage ripple coefficient.
According to the technical scheme, compared with the existing topological structure, the invention discloses the novel ultra-sparse matrix converter topological structure containing the gamma source circuit, the gamma source circuit is added through the direct current link of the USMC, the output voltage of the direct current link is improved, the inverter stage can output higher voltage, and the voltage transmission ratio range is widened.
Furthermore, by combining with an SVPWM (space vector pulse width modulation) strategy, the voltage transmission ratio of the novel USMC topological structure is deduced, and capacitance parameters in the gamma source circuit are designed.
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 diagram showing a topological structure of a novel ultra-sparse matrix converter with a gamma source circuit according to the present invention;
FIG. 2a is a schematic diagram of an equivalent topology of a gamma source circuit;
FIG. 2b is a schematic diagram of a direct-current mode equivalent structure of a gamma source circuit;
FIG. 2c is a schematic diagram of a non-through mode equivalent structure of a gamma source circuit;
FIG. 3 illustrates current vector modulation at rectifier stage;
FIG. 4 is a schematic representation of inverter stage voltage vector modulation;
FIG. 5 illustrates novel USMC switch coordination control;
FIG. 6 is a schematic diagram of a rectifier stage input three-phase voltage;
FIG. 7a illustrates the output waveform of a novel USMC rectification stage;
FIG. 7b is a diagram of a novel USMC inverter stage input waveform;
FIG. 8a illustrates a conventional USMC output line voltage;
FIG. 8b illustrates the novel USMC output line voltage;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a novel ultra-sparse matrix converter topological structure containing a gamma source circuit, and the technical scheme is further explained by combining with a specific technical background.
Referring to fig. 1, fig. 1 is a topological structure of a novel ultra-sparse matrix converter, which is divided into four parts: the input filter circuit, rectifier stage circuit, gamma source circuit, inverter stage circuit. The input filter circuit is used for connecting an alternating current power supply, and the output filter voltage is transmitted to the rectifier circuit; the input filter circuit comprises three filter branches, each filter branch is composed of an inductor L and a capacitor, and the inductor L is connected with the capacitor C in series; three groups of branches are connected in parallel, and the series nodes of the inductor L and the capacitor C respectively output voltage ua，ub，ucCurrents input to the rectifier stages correspond to i, respectivelya，ib，ic；
The rectifier stage circuit comprises three-phase bridge arms, and each phase of bridge arm is connected to each filtering branch; each phase leg consists of an IGBT and four diodes, and converts three-phase alternating voltage (filter voltage) into direct voltage, that is: the voltage is rectified.
In fig. 1, the booster circuit is a gamma source circuit, which is composed of a diode, a transformer and a capacitor, and is represented by a topological structure for convenience, and is equivalent to two inductors, and the output voltage of the booster circuit is reduced with the increase of the transformation ratio of the transformer, so that the turn ratio of the transformer is set to be 1 < NΓ≤2。
The gamma source circuit boosting link plays a role in boosting the amplitude of direct-current voltage, the gamma source topology replaces two inductors in the traditional Z source network with a transformer, and energy transfer is realized through the magnetic coupling effect, so that a capacitor is reduced, and the gamma source network structure is more compact. The transformer is added in the gamma source, so as to conveniently analyze the topological structure, the transformer is equivalent in circuit and is represented as being formed by coupling two inductors and composed of a first inductor n1And a second inductance n2Coupling to form;
the DC voltages are respectively transmitted to the first inductors n through the diodes D1And a second inductance n2The same name end of (1); first inductance n1The marking end outputs boosted voltage and transmits the boosted voltage to the inverter stage circuit; second inductance n2The marking end of the capacitor C is connected with the capacitor C.
The transformer turns ratio ranges from 1 to 2, and the smaller the turns ratio is, the stronger the boosting capacity is; and an inverter stage inversion link for inverting and outputting the boosted direct-current voltage, wherein the structure of the inverter stage is the same as that of the traditional two-level inverter.
Specifically, fig. 2a is an equivalent topology structure of a Γ -source circuit, and a diagram of a direct-mode equivalent circuit is shown in fig. 2b, at this time, upper and lower switching tubes of a certain bridge arm or a plurality of bridge arms of the USMC inverter stage are simultaneously turned on, the output direct current of the rectifier stage is 0, and a diode D in the Γ -source is in a disconnected state.
The non-direct mode is shown in fig. 2c, at this time, the upper and lower switching tubes of any bridge arm of the USMC cannot be conducted simultaneously, the output direct current of the rectifier stage is not 0, the diode D in the Γ source is in a conducting state, the inverter stage can be equivalently a voltage source, the inductor n is connected to the output direct current of the rectifier stage, and the output direct current of the rectifier stage is not 02And the DC voltage forms a loop.
The current vector modulation of the rectifier stage is shown in fig. 3, the voltage vector modulation of the inverter stage is shown in fig. 4, the turn-on sequence of the novel USMC switch coordination control switch shown in fig. 1 in one period is shown in fig. 5, namely, the double-space effective vector and zero vector synthesis diagram of the double-space effective vector synthesis inverter stage of the rectifier stage, the SVPWM modulation strategy is combined, and the capacitance parameter design of the Γ source circuit:
C≥DSTIL{1-[1+1/(γΓ-1)]DST}/[6fSrUdc(1-DST)]；
wherein DSTIs the switching duty ratio of the gamma source circuit, ILIs the average current of the inductor, gammaΓThe transformation ratio of the gamma source circuit is set; f. ofSAnd r is the output voltage ripple coefficient.
Novel super sparse matrix converter voltage transmission ratio:
wherein the content of the first and second substances,
b is the transformation ratio of the gamma source circuit and satisfies
B＝(γΓ-1)/[γΓ(1-DST)-1]
Wherein U isomFor input voltage amplitude, UdcIs a direct-current voltage, and the voltage is,
for input current displacement factor, DSTIs the switching duty ratio of the gamma source circuitΓThe transformation ratio of the gamma source circuit is set; thereby improving the voltage transmission ratio of the ultra-sparse matrix converter.
In order to verify the correctness of the proposed topology, simulation verification is performed by using Matlab/Simulik. The simulation parameters are as follows: the input voltage amplitude is 311V, the power frequency f is 50Hz, and the switching frequency fsAt 20kHz, through duty cycle DST0.1, load R of 20 omega, L of 10mH, transformation ratio gammaΓIs 1.25, capacitanceC is 470. mu.F. Under the condition of same parameter setting, the output waveforms of the traditional USMC and the novel USMC are compared, and simulation results are shown as follows. FIG. 6 shows three-phase voltage input waveforms of two topologies, which are not affected by the topology and have consistent input voltages; the abscissa represents time, the ordinate represents voltage values, the three curves are Usa, Usb and Usc respectively, and the input voltage is unchanged under the simulation of the two converters.
FIG. 7a shows the waveform of the DC voltage output from the rectifier stage of the novel USMC with a gamma source, which fluctuates between half the input line voltage and its amplitude, resulting in a good waveform; the abscissa represents time and the ordinate represents voltage values. Fig. 7b is a voltage waveform diagram of the inverter stage input via the Γ source, and the voltage amplitude is significantly increased compared to the output of the rectifier stage.
Fig. 8a shows a voltage waveform of a common USMC output line, the abscissa shows time, the ordinate shows a voltage value, the amplitude of the fundamental wave is 465.64V, and fig. 8b shows a voltage waveform of a novel USMC output line with a Γ source, the amplitude of the fundamental wave is 580.05V, so that the voltage transmission ratio of the USMC can be effectively improved by changing the transformation ratio of a transformer in the Γ source.
In summary, in the present document, a topological structure of the conventional USMC is innovated for the problem of low voltage transmission of the USMC, and on the basis that a rectification stage and an inversion stage of the USMC respectively pass through an SVPWM modulation strategy, an Γ source circuit is added in a dc link to increase an output voltage value at a dc side, and then a higher output voltage is obtained after inversion by an inversion electrode. Matlab/Simulink simulation results show that the improved USMC can simply and effectively improve the voltage transmission ratio on the basis of not adopting a complex overmodulation strategy, and can meet more high-power and high-voltage working conditions.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A novel ultra-sparse matrix converter topological structure containing a gamma source circuit is characterized by comprising: the input filter circuit, the rectifier stage circuit, the gamma source circuit and the inverter stage circuit;
the input filter circuit is used for connecting an alternating current power supply, and outputting filter voltage to the rectifier stage circuit; the rectification stage circuit receives the filtering voltage, outputs a rectification voltage and transmits the rectification voltage to the gamma source circuit;
the gamma source circuit receives the rectified voltage, outputs a boosted voltage and transmits the boosted voltage to the inverter stage circuit; the inverter stage circuit receives the boosted voltage and outputs an inverted voltage;
the gamma source circuit comprises a diode, a transformer and a capacitor;
the rectified voltage is transmitted to a transformer through the diode, the transformer is connected with a capacitor, and the transformer outputs boosted voltage and transmits the boosted voltage to the inverter stage circuit.
2. The novel ultra-sparse matrix converter topology structure comprising the gamma source circuit as claimed in claim 1, wherein the transformer is formed by coupling a first inductor and a second inductor;
the rectified voltage is transmitted to the dotted terminals of the first inductor and the second inductor respectively through the diode;
the marking end of the first inductor outputs boosted voltage and transmits the boosted voltage to the inverter stage circuit;
and the marking end of the second inductor is connected with the capacitor.
3. The novel ultra-sparse matrix converter topology structure comprising the gamma source circuit as claimed in claim 1 or 2, wherein the transformer turns ratio is in the range of 1-2.
4. The novel ultra-sparse matrix converter topology structure with the gamma source circuit as claimed in claim 3, wherein the voltage transmission ratio M of the ultra-sparse matrix converter is specifically represented as:
wherein the content of the first and second substances,
b is the transformation ratio of the gamma source circuit and satisfies the condition that B is (gamma)Γ-1)/[γΓ(1-DST)-1]
Wherein U isomFor input voltage amplitude, UdcIs a direct-current voltage, and the voltage is,
for input current displacement factor, DSTIs the switching duty ratio of the gamma source circuitΓIs the transformation ratio of the gamma source circuit.
5. The novel ultra-sparse matrix converter topology structure containing the gamma source circuit, according to claim 4, is characterized in that capacitance parameters in the gamma source circuit are designed as follows:
C≥DSTIL{1-[1+1/(γΓ-1)]DST}/[6fSrudc(1-DST)]；
wherein D isSTIs the switching duty ratio of the gamma source circuit, ILIs the average current of the inductor, gammaΓIs the transformation ratio of the gamma source circuit, fSAnd r is the output voltage ripple coefficient.
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Citations (5)
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| CN104601002A (en) * | 2014-12-29 | 2015-05-06 | 南京航空航天大学 | Novel topological structure of sparse two-stage matrix converter |
| EP2871761A1 (en) * | 2013-08-21 | 2015-05-13 | Huawei Technologies Co., Ltd. | Voltage converter and common-mode noise impedance adjusting method |
| CN107612404A (en) * | 2017-10-09 | 2018-01-19 | 哈尔滨工业大学 | Γ source inventers and modulator approach based on switching capacity |
| CN111213311A (en) * | 2017-10-13 | 2020-05-29 | 纳博特斯克有限公司 | AC-AC converter circuit |
| CN111342678A (en) * | 2020-03-13 | 2020-06-26 | 湖南工业大学 | Ultra-sparse matrix converter with Boost circuit |
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- 2021-05-29 CN CN202110595928.9A patent/CN113300614A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2871761A1 (en) * | 2013-08-21 | 2015-05-13 | Huawei Technologies Co., Ltd. | Voltage converter and common-mode noise impedance adjusting method |
| CN104601002A (en) * | 2014-12-29 | 2015-05-06 | 南京航空航天大学 | Novel topological structure of sparse two-stage matrix converter |
| CN107612404A (en) * | 2017-10-09 | 2018-01-19 | 哈尔滨工业大学 | Γ source inventers and modulator approach based on switching capacity |
| CN111213311A (en) * | 2017-10-13 | 2020-05-29 | 纳博特斯克有限公司 | AC-AC converter circuit |
| CN111342678A (en) * | 2020-03-13 | 2020-06-26 | 湖南工业大学 | Ultra-sparse matrix converter with Boost circuit |
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