CN213243557U - Grid-connected inverter circuit with reactive power compensator and inverter - Google Patents

Grid-connected inverter circuit with reactive power compensator and inverter Download PDF

Info

Publication number
CN213243557U
CN213243557U CN202020649076.8U CN202020649076U CN213243557U CN 213243557 U CN213243557 U CN 213243557U CN 202020649076 U CN202020649076 U CN 202020649076U CN 213243557 U CN213243557 U CN 213243557U
Authority
CN
China
Prior art keywords
switch tube
tube
switching tube
phase output
output end
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.)
Expired - Fee Related
Application number
CN202020649076.8U
Other languages
Chinese (zh)
Inventor
陈景文
张文倩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi University of Science and Technology
Original Assignee
Shaanxi University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shaanxi University of Science and Technology filed Critical Shaanxi University of Science and Technology
Priority to CN202020649076.8U priority Critical patent/CN213243557U/en
Application granted granted Critical
Publication of CN213243557U publication Critical patent/CN213243557U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The utility model belongs to the technical field of micro-grid, and discloses a grid-connected inverter circuit with a reactive compensator and an inverter, wherein the inverter circuit comprises a reactive compensator and a three-phase grid-connected inverter unit; the three-phase grid-connected inversion unit is connected with a direct current source, and a first phase output end, a second phase output end and a third phase output end are arranged on the output side; the first phase output end, the second phase output end and the third phase output end are connected with a reactive compensator in parallel and then connected with a power grid; the inverter comprises a voltage sensor, a DSP chip, a PWM controller and a grid-connected inverter circuit, one end of the voltage sensor is connected with a first phase output end, a second phase output end and a third phase output end, the other end of the voltage sensor is connected with the DSP chip and the PWM controller in sequence, and the PWM controller is connected with the reactive power compensator. Direct current is converted into rectangular current through a three-phase grid-connected inversion unit, harmonic waves of the rectangular current are eliminated through a reactive compensator, and finally switching operation is carried out under the frequency of a power grid, so that grid-connected inversion is completed, switching loss is reduced, and the volume of alternating current inductance is reduced.

Description

Grid-connected inverter circuit with reactive power compensator and inverter
Technical Field
The utility model belongs to the technical field of the little electric wire netting, a inverter circuit and dc-to-ac converter that are incorporated into the power networks with reactive power compensator is related to.
Background
Photovoltaic power generation technology is mature more and widely applied to various occasions, in order to fully utilize energy, the photovoltaic power generation technology needs to be connected to a power grid in parallel, in cities, commercial-scale photovoltaic systems comprise enterprise office buildings, hospitals, and other places, the systems usually adopt a plurality of strings of inverters, rated power is different from 10KW to 60KW, and therefore the inverters on the occasions are required to meet the requirements of high power density, high efficiency, low cost, small volume and the like.
Currently, one of the methods to reduce the volume of the passive devices is to increase the switching frequency of the inverter. Since high frequency switching leads to increased switching power loss, various soft switching techniques have been proposed. Such as the zero voltage switching method, by adjusting the switching frequency to force the converter current to have a zero crossing in each switching cycle without any additional resonant circuit; however, in this case, a large current is swept in the converter and its filter capacitor, and the peak current may be twice or more as large as the gate current, which is disadvantageous to the converter. There has also been proposed a high frequency switch using SiC devices, which has improved switching performance, but as the switching frequency is further increased, core loss occurs in the inductor, and the inductor loss limits the applicable switching frequency.
Meanwhile, the size of an alternating current inductor is also required to be reduced when the multi-level inverter is applied, under the condition of the same equivalent switching frequency and current ripple, the size of the inductor required by the two-level inverter is half of that of a single level, but larger active loss can be caused in low-voltage application.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome among the above-mentioned prior art shortcoming that switching loss is big, the dc-to-ac converter is bulky, provide a inverter circuit and dc-to-ac converter that are incorporated into the power networks with reactive power compensator.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
the utility model discloses an aspect, a grid-connected inverter circuit with reactive compensator, including reactive compensator and three-phase grid-connected inverter unit; the input side of the three-phase grid-connected inversion unit is connected with a direct current source, and the output side is provided with a first phase output end, a second phase output end and a third phase output end; the first phase output end, the second phase output end and the third phase output end are all connected with the reactive power compensator in parallel.
The utility model discloses the further improvement of inverter circuit that is incorporated into the power networks lies in:
the reactive compensator comprises a capacitor C1A first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4The fifth switch tube S5And a sixth switching tube S6Inductor L1Inductor L2And an inductance L3(ii) a One end of the capacitor C1 is connected with the first switch tube S1The other end of the drain electrode is connected with a second switch tube S2A source electrode of (a); first switch tube S1The drain electrode of the first switch tube is connected with the third switch tube S3The first switch tube S1Is connected with the second switch tube S2The drain electrode of the third switching tube S3Source electrode of the first switch tube S is connected with the fourth switch tube S4Drain electrode of (1), fourth switching tube S4Source electrode of and the second switch tube S2Source electrode of (1) and sixth switching tube S6Are all connected, a fifth switching tube S5The drain electrode of the first switch tube is connected with the third switch tube S3The drain electrode of the fifth switching tube S5Is connected with a sixth switching tube S6Drain electrode of (1), inductor L1One end of the first switch tube S is connected with1Source electrode, inductor L1One end of the first switch tube S is connected with1And a second switch tube S2The other end of the connecting wire is connected with the first phase output end and the inductor L2One end is connected with a third switch tube S3And a fourth switching tube S4The other end of the connecting wire is connected with the second phase output end and the inductor L3One end of the first switch tube is connected with the second switch tube5And a sixth switching tube S6The other end of the connecting wire is connected with the third phase output end.
The first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4The fifth switch tube S5And a firstSix switch tubes S6Are all MOSFET switching tubes.
The three-phase grid-connected inversion unit comprises a DC-DC converter and a three-phase inverter; the input end of the DC-DC converter is connected with a direct current power supply, the output end of the DC-DC converter is connected with the input end of the three-phase inverter, and the first phase output end, the second phase output end and the third phase output end are arranged at the output end of the three-phase inverter.
The DC-DC converter comprises a thirteenth switching tube S13Fourteenth switching tube S14And an inductance Ldc(ii) a Inductor LdcOne end of the first switch tube is connected with the positive electrode of the direct current source, and the other end of the first switch tube is connected with the thirteenth switch tube13Source electrode of (1) and fourteenth switching tube S14Drain electrode of (1), thirteenth switching tube S13Drain electrode of (1) and a fourteenth switching tube S14The source electrodes of the first and second switching tubes S are connected with the input end of the three-phase inverter14Is connected with the cathode of the direct current source.
The three-phase inverter comprises a capacitor C2Inductor Lf1Inductor Lf2Inductor Lf3Seventh switching tube S7The eighth switching tube S8The ninth switch tube S9The tenth switch tube S10The eleventh switch tube S11And a twelfth switching tube S12(ii) a Capacitor C2One end of the first switch tube is connected with the seventh switch tube S7Drain electrode of (1) and ninth switching tube S9The other end of the drain electrode is connected with an eighth switching tube S8Source electrode of (1) and tenth switching tube S10A source electrode of (a); ninth switch tube S9Source electrode of the first switch tube S is connected with the tenth switch tube S10The ninth switching tube S9And a tenth switching tube S10The first phase output end is arranged on the connecting wire; eleventh switch tube S11Drain electrode of and the ninth switching tube S9And a seventh switching tube S7The drain electrodes of the two are all connected; eleventh switch tube S11Source electrode of and the twelfth switching tube S12Is connected to the drain of the eleventh switching tube S11And a twelfth switching tube S12The connecting wire is provided with a second phase output end; twelfth switching tube S12Source electrode of and tenth switching tube S10Source electrode and eighth switching tube S8The source electrodes of the first and second transistors are all connected; seventh switching tube S7Is connected with the eighth switching tube S8Of the seventh switching tube S7And an eighth switching tube S8The connecting wire is provided with a third phase output end and an inductor Lf1Inductor Lf2And an inductance Lf3Respectively connected with the seventh phase output end, the eighth phase output end and the ninth phase output end, and the other ends are all used for connecting a power grid.
The thirteenth switch tube S13Fourteenth switching tube S14Seventh switching tube S7The eighth switching tube S8The ninth switch tube S9The tenth switch tube S10The eleventh switch tube S11And a twelfth switching tube S12Are all MOSFET switching tubes.
And a capacitor C3Capacitor C4Capacitor C5Resistance R1Resistance R2And a resistance R3(ii) a Capacitor C3Capacitor C4And a capacitor C5One end of the first and second phase output terminals is connected to the first phase output terminal, the second phase output terminal and the third phase output terminal, and the other end is connected to the resistor R1Resistance R2And a resistance R3One terminal of (1), resistance R1Resistance R2And a resistance R3The other ends of the two are connected with each other pairwise.
The utility model discloses another aspect, a grid-connected inverter with reactive power compensator, including voltage sensor, DSP chip, PWM controller and foretell grid-connected inverter circuit; one end of the voltage sensor is connected with the first phase output end, the second phase output end and the third phase output end, the other end of the voltage sensor is connected with the DSP chip and the PWM controller in sequence, and the PWM controller is connected with the reactive power compensator.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a grid-connected inverter circuit with reactive power compensator converts the direct current of input into the rectangular current through setting up three-phase grid-connected inverter unit, sets up reactive power compensator, and the harmonic in the rectangular current can be eliminated to the reactive power compensator, avoids producing electric wire netting resonance overcurrent, and the equipment overvoltage scheduling problem that arouses by it; then, switching operation is carried out in the power grid to complete grid-connected inversion, and switching loss of the inverter circuit can be reduced due to the fact that the switching frequency of the inverter circuit is equal to the power grid frequency; in addition, since the amplitude of the compensation current is smaller than half of the gate current, the current flowing through the alternating current inductor is reduced, the inductance of the required alternating current inductor is also reduced, the volume of the alternating current inductor is reduced accordingly, and compared with the traditional grid-connected inverter circuit, the volume of the alternating current inductor is greatly reduced. To sum up, the utility model discloses inverter circuit that is incorporated into the power networks can show and reduce switching loss and reduce the AC inductance volume to simple structure is convenient for realize, and is with low costs.
Furthermore, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor and a third resistor are further arranged to form an RC filter circuit, and ripple fluctuation influence is filtered.
The utility model discloses grid-connected inverter with reactive power compensator, detect first phase output end through voltage sensor, the analog voltage signal of second phase output and third phase output, convert analog voltage signal into digital voltage signal through the DSP chip, and carry out the digital voltage signal and filter the back and obtain control voltage signal and send to the PWM controller, the PWM controller generates control pulse signal and sends to reactive power compensator according to control voltage signal, can carry out opening and closing control of reactive power compensator internal switch pipe, whole device simple structure, and is easy to realize, and is low in cost.
Drawings
Fig. 1 is the topological structure diagram of the grid-connected inverter circuit of the present invention.
Wherein: 1-a reactive compensator; 2-three-phase grid-connected inversion unit; a 3-DC-DC converter; 4-a three-phase inverter; s1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13And S14Are all switch tubes; c1、C2、C3、C4And C5Are all capacitors; l is1、L2、L3、Lf1、Lf2、Lf3And LdcAre all inductors.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model discloses a grid-connected inverter circuit with reactive compensator, including reactive compensator 1 and three-phase grid-connected inverter unit 2; the input side of the three-phase grid-connected inversion unit 2 is connected with a direct current source, and the output side is provided with a first phase output end, a second phase output end and a third phase output end; the first phase output end, the second phase output end and the third phase output end are connected with the reactive power compensator 1 in parallel and then connected with a power grid. Direct current input by a direct current source is converted into rectangular current through the three-phase grid-connected inversion unit 2, harmonic waves in the rectangular current are eliminated through the reactive power compensator 1, and finally switching operation is carried out under the frequency of a power grid to complete grid-connected inversion.
Wherein, the reactive compensator 1 comprises six MOSFET switching tubes, respectively a first switching tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4The fifth switch tube S5And a sixth switching tube S6(ii) a Three energy storage inductors, L respectively1、L2And L3(ii) a And a capacitor C1。
Capacitor C1One end of the first switch tube S is connected with1The other end of the drain electrode is connected with a second switch tube S2A source electrode of (a); first switch tube S1The drain electrode of the first switch tube is connected with the third switch tube S3The first switch tube S1Is connected with the second switch tube S2The drain electrode of the third switching tube S3Source electrode of the first switch tube S is connected with the fourth switch tube S4Drain electrode of (1), fourth switching tube S4Source electrode of and the second switch tube S2Source electrode of (1) and sixth switching tube S6Are all connected, a fifth switching tube S5The drain electrode of the first switch tube is connected with the third switch tube S3The drain electrode of the fifth switching tube S5Is connected with a sixth switching tube S6Drain electrode of (1), inductor L1One end of the first switch tube S is connected with1Source electrode, inductor L1One end of the first switch tube S is connected with1And a second switch tube S2The other end of the connecting wire is connected with the first phase output end and the inductor L2One end is connected with a third switch tube S3And a fourth switching tube S4The other end of the connecting wire is connected with the second phase output end and the inductor L3One end of the first switch tube is connected with the second switch tube5And a sixth switching tube S6The other end of the connecting wire is connected with the third phase output end.
The three-phase grid-connected inversion unit 2 comprises a DC-DC converter 3 and a three-phase inverter 4; the input end of the DC-DC converter 3 is connected with a direct current power supply, the output end of the DC-DC converter is connected with the input end of the three-phase inverter 4, and the first phase output end, the second phase output end and the third phase output end are arranged at the output end of the three-phase inverter 4.
Three-phase inverterThe changer 4 comprises six MOSFET switching tubes, respectively a seventh switching tube S7The eighth switching tube S8The ninth switch tube S9The tenth switch tube S10The eleventh switch tube S11And a twelfth switching tube S12(ii) a Three energy-storage inductors, respectively inductor Lf1Inductor Lf2And an inductance Lf3(ii) a And a capacitor C2。
Capacitor C2One end of the first switch tube is connected with the seventh switch tube S7Drain electrode of (1) and ninth switching tube S9The other end of the drain electrode is connected with an eighth switching tube S8Source electrode of (1) and tenth switching tube S10A source electrode of (a); ninth switch tube S9Source electrode of the first switch tube S is connected with the tenth switch tube S10The ninth switching tube S9And a tenth switching tube S10The first phase output end is arranged on the connecting wire; eleventh switch tube S11Drain electrode of and the ninth switching tube S9And a seventh switching tube S7The drain electrodes of the two are all connected; eleventh switch tube S11Source electrode of and the twelfth switching tube S12Is connected to the drain of the eleventh switching tube S11And a twelfth switching tube S12The connecting wire is provided with a second phase output end; twelfth switching tube S12Source electrode of and tenth switching tube S10Source electrode and eighth switching tube S8The source electrodes of the first and second transistors are all connected; seventh switching tube S7Is connected with the eighth switching tube S8Of the seventh switching tube S7And an eighth switching tube S8The connecting wire is provided with a third phase output end and an inductor Lf1Inductor Lf2And an inductance Lf3One end of the first phase is connected with the seventh phase output end, the eighth phase output end and the ninth phase output end respectively, and the other end of the first phase is connected with the power grid.
The DC-DC converter 3 comprises two MOSFET switching tubes, a thirteenth switching tube S13And a fourteenth switching tube S14(ii) a And an inductance Ldc. Inductor LdcOne end of the first switch tube is connected with the positive electrode of the direct current source, and the other end of the first switch tube is connected with the thirteenth switch tube13Source electrode of (1) and fourteenth switching tube S14Drain electrode of (1), thirteenth switching tube S13Drain electrode of (1) and a fourteenth switching tube S14The source electrodes of the first and second switching tubes S are connected with the input end of the three-phase inverter14Is connected with the cathode of the direct current source.
In this embodiment, the dc bus voltage is 300V, and the capacitor C1Capacitor C2Capacitor C3Capacitor C4And a capacitor C5Are all 13 muf, inductance L1Inductor L2Inductor L3Inductor Lf1Inductor Lf2Inductor Lf3And an inductance LdcThe voltage is 0.5mH, the model IXFB110N60P3 is selected as the MOSFET switch tube, the working voltage is 600V, and the working current is 50A.
In a preferred embodiment, the grid-connected inverter with the reactive compensator may further include a capacitor C3Capacitor C4Capacitor C5Resistance R1Resistance R2And a resistance R3(ii) a Capacitor C3Capacitor C4And a capacitor C5One end of the first and second phase output terminals is connected to the first phase output terminal, the second phase output terminal and the third phase output terminal, and the other end is connected to the resistor R1Resistance R2And a resistance R3One terminal of (1), resistance R1Resistance R2And a resistance R3The other ends of the two capacitors are connected in pairs, and the resistor R and the capacitor C are connected in series to form a filter circuit for filtering out ripple fluctuation influence.
The utility model also provides a grid-connected inverter with reactive compensator, which comprises a voltage sensor, a DSP chip, a PWM controller and the grid-connected inverter circuit; one end of the voltage sensor is connected with the first phase output end, the second phase output end and the third phase output end, the other end of the voltage sensor is sequentially connected with the DSP chip and the PWM controller, and the PWM controller is connected with the reactive power compensator 1.
When the utility model is used, the input direct current is converted into rectangular current through the three-phase grid-connected inverter unit 2, the switching operation is carried out under the power grid frequency, the working frequency of the switch tube is equal to the power grid frequency, so that the switching loss is very small, the harmonic wave in the rectangular current is eliminated through the reactive power compensator 1, the on-off control of the switch tube in the reactive power compensator 1 can be realized through the PWM controller, the analog voltage signals output by the first phase output end, the second phase output end and the third phase output end are detected by the voltage sensor, the analog voltage signals are converted into digital voltage signals through the DSP chip, the digital voltage signals are filtered to obtain control voltage signals and are sent to the PWM controller, the PWM controller generates control pulse signals according to the control voltage signals and sends the control pulse signals to the switch tube, the on and off control of the switching tube can be performed. Meanwhile, the switching frequency of the inverter is equal to the grid frequency, so that the switching loss of the switching tube can be reduced. Since the amplitude of the compensation current is less than half of the gate current, the current flowing through the alternating current inductor is small, and therefore, compared with the conventional grid-connected inverter, the required inductance of the alternating current inductor is also reduced, namely, the volume of the alternating current inductor is reduced.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims (9)

1. A grid-connected inverter circuit with a reactive compensator is characterized by comprising a reactive compensator (1) and a three-phase grid-connected inverter unit (2);
the input side of the three-phase grid-connected inversion unit (2) is connected with a direct current source, and the output side is provided with a first phase output end, a second phase output end and a third phase output end; the first phase output end, the second phase output end and the third phase output end are all connected with the reactive power compensator (1) in parallel.
2. Grid-connected inverter circuit with reactive power compensator according to claim 1, characterized in that the reactive power compensator (1) comprises a capacitor C1A first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4The fifth switch tube S5And a sixth switching tube S6Inductor L1Inductor L2And an inductance L3；
Capacitor C1One end of the first switch tube S is connected with1The other end of the drain electrode is connected with a second switch tube S2A source electrode of (a); first switch tube S1The drain electrode of the first switch tube is connected with the third switch tube S3The first switch tube S1Is connected with the second switch tube S2The drain electrode of the third switching tube S3Source electrode of the first switch tube S is connected with the fourth switch tube S4Drain electrode of (1), fourth switching tube S4Source electrode of and the second switch tube S2Source electrode of (1) and sixth switching tube S6Are all connected, a fifth switching tube S5The drain electrode of the first switch tube is connected with the third switch tube S3The drain electrode of the fifth switching tube S5Is connected with a sixth switching tube S6Drain electrode of (1), inductor L1One end of the first switch tube S is connected with1Source electrode, inductor L1One end of the first switch tube S is connected with1And a second switch tube S2The other end of the connecting wire is connected with the first phase output end and the inductor L2One end is connected with a third switch tube S3And a fourth switching tube S4The other end of the connecting wire is connected with the second phase output end and the inductor L3One end of the first switch tube is connected with the second switch tube5And a sixth switching tube S6The other end of the connecting wire is connected with the third phase output end.
3. The grid-connected inverter circuit with reactive power compensator of claim 2, wherein the first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4The fifth switch tube S5And a sixth switching tube S6Are all MOSFET switching tubes.
4. The grid-connected inverter circuit with reactive power compensator according to claim 1, characterized in that the three-phase grid-connected inverter unit (2) comprises a DC-DC converter (3) and a three-phase inverter (4);
the input end of the DC-DC converter (3) is connected with a direct current power supply, the output end of the DC-DC converter is connected with the input end of the three-phase inverter (4), and the first phase output end, the second phase output end and the third phase output end are arranged at the output end of the three-phase inverter (4).
5. Grid-connected inverter circuit with reactive power compensator according to claim 4, characterized in that the DC-DC converter (3) comprises a thirteenth switching tube S13Fourteenth switching tube S14And an inductance Ldc；
Inductor LdcOne end of the first switch tube is connected with the positive electrode of the direct current source, and the other end of the first switch tube is connected with the thirteenth switch tube13Source electrode of (1) and fourteenth switching tube S14Drain electrode of (1), thirteenth switching tube S13Drain electrode of (1) and a fourteenth switching tube S14The source electrodes of the first and second switching tubes S are connected with the input end of the three-phase inverter14Is connected with the cathode of the direct current source.
6. Grid-connected inverter circuit with reactive power compensator according to claim 5, characterized in that the three-phase inverter (4) comprises a capacitor C2Inductor Lf1Inductor Lf2Inductor Lf3Seventh switching tube S7The eighth switching tube S8The ninth switch tube S9The tenth switch tube S10The eleventh switch tube S11And a twelfth switching tube S12；
Capacitor C2One end of the first switch tube is connected with the seventh switch tube S7Drain electrode of (1) and ninth switching tube S9The other end of the drain electrode is connected with an eighth switching tube S8Source electrode of (1) and tenth switching tube S10A source electrode of (a); ninth switch tube S9Source electrode of the first switch tube S is connected with the tenth switch tube S10The ninth switching tube S9And a tenth switching tube S10The first phase output end is arranged on the connecting wire; eleventh switch tube S11Drain electrode of and the ninth switching tube S9And a seventh switching tube S7The drain electrodes of the two are all connected; eleventh switch tube S11Source electrode of and the twelfth switching tube S12Is connected to the drain of the eleventh switching tube S11And a twelfth switching tube S12The connecting wire is provided with a second phase output end; twelfth switching tube S12Source electrode of and tenth switching tube S10Source electrode and eighth switching tube S8The source electrodes of the first and second transistors are all connected; seventh switching tube S7Is connected with the eighth switching tube S8Of the seventh switching tube S7And an eighth switching tube S8The connecting wire is provided with a third phase output end and an inductor Lf1Inductor Lf2And an inductance Lf3Respectively connected with the seventh phase output end, the eighth phase output end and the ninth phase output end, and the other ends are all used for connecting a power grid.
7. The grid-connected inverter circuit with reactive power compensator of claim 6, wherein the thirteenth switching tube S13Fourteenth switching tube S14Seventh switching tube S7The eighth switching tube S8The ninth switch tube S9The tenth switch tube S10The eleventh switch tube S11And a twelfth switching tube S12Are all MOSFET switching tubes.
8. The grid-connected inverter circuit with reactive power compensator of claim 1, further comprising a capacitor C3Capacitor C4Capacitor C5Resistance R1Resistance R2And a resistance R3；
Capacitor C3Capacitor C4And a capacitor C5One end of the first and second phase output terminals is connected to the first phase output terminal, the second phase output terminal and the third phase output terminal, and the other end is connected to the resistor R1Resistance R2And a resistance R3One terminal of (1), resistance R1Resistance R2And a resistance R3The other ends of the two are connected with each other pairwise.
9. An inverter with a reactive compensator, characterized by comprising a voltage sensor, a DSP chip, a PWM controller and the grid-connected inverter circuit of any one of claims 1 to 8;
one end of the voltage sensor is connected with the first phase output end, the second phase output end and the third phase output end, the other end of the voltage sensor is sequentially connected with the DSP chip and the PWM controller, and the PWM controller is connected with the reactive power compensator (1).
CN202020649076.8U 2020-04-24 2020-04-24 Grid-connected inverter circuit with reactive power compensator and inverter Expired - Fee Related CN213243557U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020649076.8U CN213243557U (en) 2020-04-24 2020-04-24 Grid-connected inverter circuit with reactive power compensator and inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020649076.8U CN213243557U (en) 2020-04-24 2020-04-24 Grid-connected inverter circuit with reactive power compensator and inverter

Publications (1)

Publication Number Publication Date
CN213243557U true CN213243557U (en) 2021-05-18

Family

ID=75868272

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020649076.8U Expired - Fee Related CN213243557U (en) 2020-04-24 2020-04-24 Grid-connected inverter circuit with reactive power compensator and inverter

Country Status (1)

Country Link
CN (1) CN213243557U (en)

Similar Documents

Publication Publication Date Title
CN104009666B (en) Method and apparatus for producing three-phase current
CN101980409B (en) Grid-connected photovoltaic inverter
CN103001523B (en) Zero-voltage switching energy storage bridge-type inverter without additional voltage and modulation method for inverter
CN102158072B (en) Power inverter of parallel-connected electric bridge type impedance network
CN104638971B (en) A kind of photovoltaic combining inverter and its control method
CN103078522A (en) Control device and control method for AC-DC (Alternating Current-Direct Current) series resonant matrix converter for capacitor charging
CN105939126B (en) A kind of quasi- Z-source inverter of switched inductors type mixing
CN105978376A (en) Grid-connected inverter circuit and control method thereof
CN102361408A (en) Non-isolated photovoltaic grid-connected inverter and switching control time sequence thereof
CN102291019A (en) Full-bridge rectification-direct-current push-pull inversion AC-DC (alternating current-to-direct current) converter
Liu et al. A modified single-phase transformerless Y-source PV grid-connected inverter
CN103956927A (en) Voltage-active-clamping non-transformer-type single-phase photovoltaic inverter
CN110086360A (en) A kind of five level high efficiency rectifiers
CN202495887U (en) Inverter used in photovoltaic power generation
CN102983767B (en) Low auxiliary voltage zero voltage switch Stockbridge vibration inverter and modulator approach
CN106169885A (en) A kind of tandem type six switchs multi-electrical level inverter
CN113765346B (en) Current source grid-connected inverter based on transformer filtering and dual-carrier modulation method thereof
CN102611347A (en) Single-phase non-isolated solar grid-connected inverter
CN107565814A (en) A kind of quasi- Z source switch boosting inverters of high-gain suitable for fuel cell power generation
CN206790354U (en) The two-way charging device of the more level of high-frequency isolation series resonance
CN106899203B (en) Forward five-level inverter
CN102969885B (en) Without auxiliary voltage zero voltage switch Bridgeless Power Factor Corrector and modulator approach
CN206117540U (en) Switch accurate Z source dc -to -ac converter of type high -gain that steps up
CN107834888A (en) A kind of Transformer-free single-phase photovoltaic inverter of voltage hybrid clamp
CN104201717A (en) Permanent magnet direct-driven wind power system

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20210518

CF01 Termination of patent right due to non-payment of annual fee