CN210405078U - Three-phase multiple power frequency isolation type photovoltaic grid-connected inverter - Google Patents
Three-phase multiple power frequency isolation type photovoltaic grid-connected inverter Download PDFInfo
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- CN210405078U CN210405078U CN201921662977.4U CN201921662977U CN210405078U CN 210405078 U CN210405078 U CN 210405078U CN 201921662977 U CN201921662977 U CN 201921662977U CN 210405078 U CN210405078 U CN 210405078U
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Abstract
The embodiment of the utility model discloses multiple power frequency isolated form photovoltaic grid-connected inverter of three-phase, including first photovoltaic array, second photovoltaic array, first direct current side steady voltage electric capacity, second direct current side steady voltage electric capacity, first three-phase voltage type inverter bridge, second three-phase voltage type inverter bridge, novel isolated transformer based on inductive filtering technique, first direct current side steady voltage electric capacity links to each other with the direct current side of first photovoltaic array and first three-phase voltage type inverter bridge, and second direct current side steady voltage electric capacity links to each other with the direct current side of second photovoltaic array and second three-phase voltage type inverter bridge. The utility model not only can replace the function of LC filter, but also can effectively eliminate the harmonic flux in the transformer core compared with the traditional system scheme of adding LC filter device; therefore, the quality of the electric energy of the secondary grid-connected side of the transformer can be improved, and the adverse effect of harmonic waves on the transformer can be restrained.
Description
Technical Field
The utility model relates to a power electronic control technical field especially relates to a multiple power frequency isolated form photovoltaic grid-connected inverter of three-phase.
Background
With the rapid development of the economy of China, the consumption structures of urban and rural residents are continuously upgraded, and the resource contradiction is outstanding, so that the development of new energy and the improvement of the energy structure are very important for the stable economic development. In order to solve the energy crisis and protect the environment on which human beings live, the search for new energy becomes the present first problem. Such as solar energy, wind energy, tidal energy, etc., are renewable clean energy sources. Solar energy has the advantages of inexhaustibility, cleanness, easiness in maintenance and the like, so that the three-phase multiple power frequency isolation type photovoltaic grid-connected inverter becomes a hotspot of current research.
However, due to the nonlinearity of the inverter device, the reliability and the service life of the three-phase multiple power frequency isolation type photovoltaic grid-connected inverter can be reduced by harmonic pollution generated after the direct current of the photovoltaic array passes through the DC/AC converter. The conventional approach is to connect an LC filter after the DC/AC inverter to suppress harmonic pollution generated by the inverter. The filter can inhibit various harmonic waves in the photovoltaic inverter, and can effectively solve the problem of harmonic pollution of the photovoltaic inverter with different power levels from low power to high power. In many cases, however, the filter has a large capacity, which increases the cost and size of the system and also introduces additional energy loss.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve lies in, provides a multiple power frequency isolated form photovoltaic grid-connected inverter of three-phase to make reduce cost, volume and energy consumption.
In order to solve the above technical problem, an embodiment of the present invention provides a three-phase multiple power frequency isolated photovoltaic grid-connected inverter, which includes a first photovoltaic array, a second photovoltaic array, a first dc-side voltage-stabilizing capacitor, a second dc-side voltage-stabilizing capacitor, the novel isolation type transformer comprises a first three-phase voltage type inverter bridge, a second three-phase voltage type inverter bridge and a novel isolation type transformer based on an induction filtering technology, wherein a first direct current side voltage stabilizing capacitor is connected with a first photovoltaic array and the direct current side of the first three-phase voltage type inverter bridge, a second direct current side voltage stabilizing capacitor is connected with a second photovoltaic array and the direct current side of the second three-phase voltage type inverter bridge, the alternating current side of the first three-phase voltage type inverter bridge and the alternating current side of the second three-phase voltage type inverter bridge are respectively connected with a first group of primary windings and a second group of primary windings of the novel isolation type transformer based on the induction filtering technology, and a secondary winding of the novel isolation type transformer based on the induction filtering technology is externally connected with a three-phase power frequency alternating current power grid.
Furthermore, the novel isolation transformer based on the induction filtering technology is composed of three core columns, and each core column is provided with three primary windings and one secondary winding; each winding is independent of the other, and the turn ratio of each winding is N1:N2:N3:N4=1k 1:1.73k 1:1.73k 21, wherein N1、N2、N3、N4The number of turns of a first group of primary windings, the number of turns of a second group of primary windings, the number of turns of a third group of primary windings and the number of turns of a secondary winding of the isolation transformer based on the induction filtering technology are respectively,k 1the turn ratio of primary and secondary windings of the isolated transformer,k 2the turn ratio of the induction filter winding to the secondary winding is; novel isolated voltage transformation based on inductive filtering technologyThe first group of three primary windings of the device are connected in a star shape, the second group of three primary windings are connected in a triangle shape, the third group of three primary windings are connected in a triangle shape, the three secondary windings form the star connection, each phase of the third group of primary windings is connected with a group of filter capacitors and filter inductors which are connected in series, and the three groups of filter capacitors and filter inductors which are connected in series are connected in a star shape to form the induction filter device.
Further, the first dc-side voltage-stabilizing capacitor and the second dc-side voltage-stabilizing capacitor are both composed of two large capacitors with the same size.
Furthermore, the first three-phase voltage type inverter bridge and the second three-phase voltage type inverter bridge are formed by connecting three bridge arms in parallel, each bridge arm is formed by connecting two controllable devices in series, each controllable device is provided with an uncontrollable device in inverse parallel connection, and the three-phase voltage output by the first three-phase voltage type inverter bridge and the second three-phase voltage type inverter bridge is 30 in phase voltageoThe phase difference of (1).
Furthermore, the first photovoltaic array and the second photovoltaic array are the same in shape and size and have the same capacity.
The utility model has the advantages that: the utility model not only can replace the function of LC filter, but also can effectively eliminate the harmonic flux in the transformer core compared with the traditional system scheme of adding LC filter device; therefore, the quality of the electric energy of the secondary grid-connected side of the transformer can be improved, and the adverse effect of harmonic waves on the transformer can be restrained.
Drawings
Fig. 1 is the circuit structure diagram of the utility model discloses multiple power frequency isolated form photovoltaic grid-connected inverter of three-phase.
Fig. 2 is a winding structure diagram of a novel isolated transformer based on an inductive filtering technology according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a first operating mode of a three-phase voltage-mode inverter bridge according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a second operation mode of the three-phase voltage-mode inverter bridge according to the embodiment of the present invention.
Fig. 5 is a circuit diagram of a third operating mode of a three-phase voltage-mode inverter bridge according to an embodiment of the present invention.
Fig. 6 is a circuit diagram of a fourth operating mode of the three-phase voltage-mode inverter bridge according to the embodiment of the present invention.
Fig. 7 is a circuit diagram of a fifth operation mode of the three-phase voltage-mode inverter bridge according to the embodiment of the present invention.
Fig. 8 is a circuit diagram of a sixth operating mode of a three-phase voltage-mode inverter bridge according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1-2, the utility model discloses a multiple power frequency isolated photovoltaic grid-connected inverter of three-phase includes first photovoltaic array 1, second photovoltaic array 2, first direct current side voltage-stabilizing capacitor 3, second direct current side voltage-stabilizing capacitor 4, first three-phase voltage type inverter bridge 5, second three-phase voltage type inverter bridge 6, novel isolated transformer 7 based on induction filtering technique.
The first direct current side voltage-stabilizing capacitor 3 is connected with the first photovoltaic array 1 and the direct current side of the first three-phase voltage type inverter bridge 5, the second direct current side voltage-stabilizing capacitor 4 is connected with the second photovoltaic array 2 and the direct current side of the second three-phase voltage type inverter bridge 6, the alternating current side of the first three-phase voltage type inverter bridge 5 and the alternating current side of the second three-phase voltage type inverter bridge 6 are respectively connected with the first group and the second group of primary windings of the novel isolation type transformer 7 based on the induction filtering technology, and the secondary windings of the novel isolation type transformer 7 based on the induction filtering technology are externally connected with a three-phase power frequency alternating current power grid.
Referring to fig. 1 to 2, as an embodiment, a novel isolation transformer 7 based on an inductive filtering technology is composed of three core columns, and each core column is provided with three primary windings and one secondary winding. As shown in fig. 1, the windings on the three core columns are respectively a1、a2、a3、a，b1、b2、b3、b，c1、c2、c3And c, the step (a) is carried out. Winding a1、a2、a3A, on the same core column, winding b1、b2、b3B, on the same core column, winding c1、c2、c3And c, the core column is positioned on the same core column. Each winding is independent of the other, and the turn ratio of each winding is N1:N2:N3:N4=1k 1:1.73k 1:1.73k 21, wherein N1、N2、N3、N4The number of turns of a first group of primary windings, the number of turns of a second group of primary windings, the number of turns of a third group of primary windings and the number of turns of a secondary winding (namely a, b and c in figure 1) of the isolation transformer based on the induction filtering technology are respectively,k 1the turn ratio of primary and secondary windings of the isolated transformer,k 2the turn ratio of the induction filter winding to the secondary winding is shown.
The first three primary windings (i.e. a in fig. 1) of the novel isolated transformer 7 based on the inductive filtering technology1、b1、c1) Wye-connected, second set of three primary windings (i.e. a in fig. 1)2、b2、c2) Delta-connected, third set of three primary windings (i.e. a in fig. 1)3、b3、c3) Delta connection, star connection formed by three secondary windings, and one group of each phase of the third group of primary windingsThe filter capacitors and the filter inductors which are connected in series are connected, and the three groups of filter capacitors and the filter inductors which are connected in series are connected in a star shape to form the induction filter device, so that the function of filtering characteristic subharmonics can be realized. I.e. the primary winding a1、b1、c1Form a star connection, the positive ends of which are respectively connected with the right ends of the first group of inverter bridges, and the primary winding a2、b2、c2Form an angular connection, the positive end of the angular connection is respectively connected with the right ends of a second group of inverter bridges, and a primary winding a3、b3、c3Form an angular connection, and the positive ends of the angular connections are respectively connected with an external filter device. The embodiment adopts the isolated transformer, and the primary side and the secondary side of the transformer are electrically isolated, so that the transformer has higher safety.
The utility model discloses utilize △ Y of transformer secondary winding to connect and eliminate low order harmonic current, the every looks of third group's primary winding links to each other with the filter capacitance and the filter inductance of establishing ties respectively, can realize the function of filtering characteristic subharmonic.
The embodiment of the utility model provides a restrain the specific principle of harmonic is;
the utility model discloses different with the conventional two split transformers that only contain two primary windings and a secondary winding, novel isolated transformer 7 based on induction filtering technology has additionally increased a filter winding, and it connects filter equipment specially. In the context of figure 1 of the drawings,C as，C bs，C csthree-phase capacitors of an additional filter of a third group of primary windings of the isolation transformer based on the induction filtering technology,L as，L bs，L csthe three-phase inductors are respectively the three-phase inductors of an additional filter of the third group of primary windings of the isolation transformer based on the induction filtering technology.L as，L bs，L csAndC as，C bs，C csthe winding connection mode is Y/△/△/Y, and the phase shift 30 is connected with the winding through the Y connection winding and △ connection windingoAnd 6n +/-1 harmonics generated by the inverter bridge are counteracted. The application of the simultaneous induction filtering technology enables a zero-impedance path to be formed inside the transformer12 n +/-1 subharmonics flowing into the transformer from the DC/AC converter can be converged and led out from the filter winding, and the function of filtering characteristic subharmonics is realized by matching with an external filter device.
In one embodiment, the first dc-side voltage stabilizing capacitor 3 and the second dc-side voltage stabilizing capacitor 4 are both composed of two large capacitors with the same size, so that the voltage at the left end of the first three-phase voltage type inverter bridge 5 and the voltage at the left end of the second three-phase voltage type inverter bridge 6 are substantially free of pulsation, and the first dc-side voltage stabilizing capacitor 3 and the second dc-side voltage stabilizing capacitor 4 can play a role in buffering reactive energy. As shown in FIG. 1, the first DC-side voltage stabilizing capacitor 3 is composed of a top capacitorC 11And a capacitor at the lower endC 12The second DC side voltage stabilizing capacitor 4 is composed of a capacitor at the upper endC 21And a capacitor at the lower endC 22And (4) forming. Capacitor with a capacitor elementC 11Capacitor and method for manufacturing the sameC 12Capacitor and method for manufacturing the sameC 21And a capacitorC 22Have the same volume value.
As an implementation mode, the first three-phase voltage type inverter bridge 5 and the second three-phase voltage type inverter bridge 6 are formed by connecting three bridge arms in parallel, each bridge arm is formed by connecting two controllable devices in series, each controllable device is provided with an anti-parallel uncontrollable device, and the PWM synchronous modulation control mode is adopted to enable the three-phase voltage output by the first three-phase voltage type inverter bridge 5 and the second three-phase voltage type inverter bridge 6 to have 30 degrees of three-phase voltageoThe phase difference of (1). The utility model discloses a three-phase voltage type inverter bridge circuit reliability is high, is applicable to high-power occasion. As shown in FIG. 1, three arms of the first three-phase voltage-type inverter bridge 5 are respectively composed of controllable devices V11And a controllable device V14Controllable device V13And a controllable device V16Controllable device V15And a controllable device V12Are connected in series. Controllable device V11Controllable device V14Controllable device V13Controllable device V16Controllable device V15And a controllable device V12On each of which is connected in anti-series with a diode D11Diode D14Diode D13Diode D16Diode D15And a diode D12. Three bridge arms of the second three-phase voltage type inverter bridge 6 are respectively composed of controllable devices V21And a controllable device V24Controllable device V23And a controllable device V26Controllable device V25And a controllable device V22Are connected in series. Controllable device V21Controllable device V24Controllable device V23Controllable device V26Controllable device V25And a controllable device V22On each of which is connected in anti-series with a diode D21Diode D24Diode D23Diode D26Diode D25And a diode D22. In the context of figure 1 of the drawings,i a1、i b1、i c1for a three-phase current flowing into the primary windings of the first set of the isolation transformer based on inductive filtering techniques,i a2、i b2、i c2for three-phase current flowing into the second set of primary windings of the isolation transformer based on inductive filtering techniques,i as、i bs、i csin order to flow the three-phase current of the primary windings of the third group of the isolation transformer based on the induction filtering technology,i a、i b、i cfor the three-phase current flowing into the three-phase power frequency power supply,u a，u b，u cand is a three-phase power supply voltage.
As an embodiment, the first photovoltaic array 1 and the second photovoltaic array 2 have the same shape and size and the same capacity, and can provide direct current electric energy to different degrees according to the change of solar irradiance. The first photovoltaic array 1 and the second photovoltaic array 2 are groups of photovoltaic power generation cells that convert solar radiation into direct current by parallel connection and series connection.
The following description of the present embodiment is provided with reference to fig. 1, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, and fig. 8, and the circuit operation modes of the two sets of three-phase voltage type inverter bridges of the three-phase multiple-power-frequency isolation type photovoltaic grid-connected inverter of the present invention are as follows:
when in useωt∈(0o-60o) The working mode of the circuit is shown in FIG. 3;
when in useωt∈(60o-120o) The working mode of the circuit is shown in FIG. 4;
when in useωt∈(120o-180o) The working mode of the circuit is shown in FIG. 5;
when in useωt∈(180o-240o) The working mode of the circuit is shown in FIG. 6;
when in useωt∈(240o-300o) The working mode of the circuit is shown in FIG. 7;
when in useωt∈(300o-360o) The operation mode of the circuit is shown in fig. 8.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A three-phase multiple power frequency isolation type photovoltaic grid-connected inverter is characterized by comprising a first photovoltaic array, a second photovoltaic array, a first direct current side voltage-stabilizing capacitor and a second direct current side voltage-stabilizing capacitor, the novel isolation type transformer comprises a first three-phase voltage type inverter bridge, a second three-phase voltage type inverter bridge and a novel isolation type transformer based on an induction filtering technology, wherein a first direct current side voltage stabilizing capacitor is connected with a first photovoltaic array and the direct current side of the first three-phase voltage type inverter bridge, a second direct current side voltage stabilizing capacitor is connected with a second photovoltaic array and the direct current side of the second three-phase voltage type inverter bridge, the alternating current side of the first three-phase voltage type inverter bridge and the alternating current side of the second three-phase voltage type inverter bridge are respectively connected with a first group of primary windings and a second group of primary windings of the novel isolation type transformer based on the induction filtering technology, and a secondary winding of the novel isolation type transformer based on the induction filtering technology is externally connected with a three-phase power frequency alternating current power grid.
2. The three-phase multiple power frequency isolated photovoltaic grid-connected inverter of claim 1, wherein the induction-based grid-connected inverterThe novel isolation type transformer of the filtering technology consists of three core columns, wherein each core column is provided with three primary windings and one secondary winding; each winding is independent of the other, and the turn ratio of each winding is N1:N2:N3:N4=1k 1:1.73k 1:1.73k 21, wherein N1、N2、N3、N4The number of turns of a first group of primary windings, the number of turns of a second group of primary windings, the number of turns of a third group of primary windings and the number of turns of a secondary winding of the isolation transformer based on the induction filtering technology are respectively,k 1the turn ratio of primary and secondary windings of the isolated transformer,k 2the turn ratio of the induction filter winding to the secondary winding is; the novel isolation type transformer based on the induction filtering technology is characterized in that a first group of three primary windings are connected in a star shape, a second group of three primary windings are connected in a triangle shape, a third group of three primary windings are connected in a triangle shape, three secondary windings form the star connection, each phase of the third group of primary windings is connected with a group of filter capacitors and filter inductors which are connected in series, and the three groups of filter capacitors and filter inductors which are connected in series are connected in the star shape to form an induction filtering device.
3. The three-phase multiple power frequency isolated photovoltaic grid-connected inverter according to claim 1, wherein the first and second dc-side voltage stabilizing capacitors are each composed of two large capacitors having the same size.
4. The three-phase multiple power frequency isolated photovoltaic grid-connected inverter as claimed in claim 1, wherein the first and second three-phase voltage type inverter bridges are formed by connecting three bridge arms in parallel, each bridge arm is formed by connecting two controllable devices in series, each controllable device is provided with an uncontrollable device in anti-parallel connection, and the three-phase voltage output by the first and second three-phase voltage type inverter bridges has a voltage of 30%oThe phase difference of (1).
5. The three-phase multiple power frequency isolated photovoltaic grid-connected inverter of claim 1, wherein the first photovoltaic array and the second photovoltaic array are the same in shape and size and have the same capacity.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116566232A (en) * | 2023-06-27 | 2023-08-08 | 深圳市首航新能源股份有限公司 | Level conversion circuit, inverter and energy storage system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116566232A (en) * | 2023-06-27 | 2023-08-08 | 深圳市首航新能源股份有限公司 | Level conversion circuit, inverter and energy storage system thereof |
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Effective date of registration: 20210128 Address after: 518101 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. Address before: 518000 Guangdong Province Shenzhen Baoan District Shiyan Street Longteng community Guanghui road 28 Jiayu Industrial Zone office building a, first floor East, third floor, factory building B Patentee before: GROWATT NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Address after: 518101 floor a401, 4-13, building a, Sino German European Industrial Demonstration Park, Hangcheng Avenue, guxing community, Xixiang street, Bao'an District, Shenzhen, Guangdong Patentee after: Shenzhen Growatt New Energy Technology Co.,Ltd. Address before: 518101 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. |