CN111641335A - Household photovoltaic power generation power optimizer with high step-up ratio - Google Patents
Household photovoltaic power generation power optimizer with high step-up ratio Download PDFInfo
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- CN111641335A CN111641335A CN202010418084.6A CN202010418084A CN111641335A CN 111641335 A CN111641335 A CN 111641335A CN 202010418084 A CN202010418084 A CN 202010418084A CN 111641335 A CN111641335 A CN 111641335A
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- capacitor
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- positive polarity
- main control
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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
- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a household photovoltaic power generation power optimizer with a high step-up ratio, which comprises a main control switch S, a capacitor C1, a diode D2, a capacitor C2 and a diode D3; the anode of the diode D2 is connected with the positive polarity end of the capacitor C1; the cathode of the diode D2 is connected with the positive polarity end of the capacitor C2; the anode of the diode D3 is connected with the negative polarity end of the capacitor C1; the cathode of the diode D3 is connected with the negative polarity end of the capacitor C2; the drain electrode of the main control switch S is simultaneously connected with the anode of the diode D2 and the positive polarity end of the capacitor C1; the source electrode of the main control switch S is simultaneously connected with the cathode of the diode D3 and the negative polarity end of the capacitor C2; the freewheeling circuit formed by the capacitor C1 and the diode D3 is connected with the freewheeling circuit formed by the capacitor C2 and the diode D2 in an X-shaped network mode; and the output MN of the X-type network is respectively connected with the positive polarity end and the negative polarity end of the output side. The invention can realize higher voltage boosting ratio.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a household photovoltaic power generation power optimizer with a high step-up ratio.
Background
The shortage of traditional fossil fuel energy sources and their pollution of the ecological environment during use has led to an increasing research and development of renewable energy sources. Renewable primary energy sources such as solar, wind, tidal, etc. often power or incorporate electricity into local loads through high performance power conversion devices. In order to adapt to the types of power supplies with low output voltages and wide variation ranges, such as photovoltaic power supplies, fuel cells, and the like, a DC/DC converter with high boosting capability is generally required for boosting. The photovoltaic power generation power optimizer is a DC/DC converter with a maximum power point tracking function. In order to obtain the maximum energy for the later stage inversion part, the power optimizer generally needs to have a strong boosting capability, and convert the wide-range output low voltage of the photovoltaic array into a higher intermediate bus voltage (single-phase direct current 400V, three-phase direct current 800V). One approach is to BOOST using a conventional BOOST converter, but the BOOST range is limited due to the limitations of the maximum and minimum duty cycles of the actual control chip. Moreover, when the BOOST converter works under the condition of extreme duty ratio, the efficiency and the device stress are very bad, the electromagnetic interference caused to the outside and the internal noise of the circuit are very serious, and the overall performance is not satisfactory. Another common solution is to use a high frequency transformer for boosting, but the transformer increases the size and control difficulty, reduces the power density, and the leakage inductance of the transformer causes extra loss and device stress. The higher BOOST ratio can also be obtained by cascading multiple BOOST converters, but the overall efficiency is the product of the efficiencies of the converters at all stages, and is generally low, the number of circuit elements is large, the synchronization problem between the converters at all stages needs to be considered, and the control is relatively complex.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to disclose a household photovoltaic power generation power optimizer with a high boosting ratio to solve the problem of limited boosting capacity in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a household photovoltaic power generation power optimizer with a high step-up ratio comprises a master switch S, a capacitor C1, a diode D2, a capacitor C2 and a diode D3; the anode of the diode D2 is connected with the positive polarity end of the capacitor C1; the cathode of the diode D2 is connected with the positive polarity end of the capacitor C2; the anode of the diode D3 is connected with the negative polarity end of the capacitor C1; the cathode of the diode D3 is connected with the negative polarity end of the capacitor C2; the drain electrode of the main control switch S is simultaneously connected with the anode of the diode D2 and the positive polarity end of the capacitor C1; the source electrode of the main control switch S is simultaneously connected with the cathode of the diode D3 and the negative polarity end of the capacitor C2; the freewheeling circuit formed by the capacitor C1 and the diode D3 is connected with the freewheeling circuit formed by the capacitor C2 and the diode D2 in an X-shaped network mode; and the output MN of the X-type network is respectively connected with the positive polarity end and the negative polarity end of the output side.
Further, the source electrode of the main control switch S is simultaneously connected with the negative polarity end of the input side; and the drain electrode of the main control switch S is simultaneously connected with the positive polarity end of the input side.
Further, an inductor L1 is connected in series between the positive polarity end of the input side and the drain of the main control switch S.
Further, the main switch S includes a diode D1.
Further, the diode D1, the diode D2 and the diode D3 are ordinary silicon-based diodes or silicon carbide diodes.
Further, an output MN of the X-type network is connected with a low-pass filter; the low-pass filter comprises an inductor L2 and a capacitor C3; one end of the inductor L2 is connected with the cathode of the diode D2 and the positive polarity end of the capacitor C2, and the other end is connected with the positive polarity end of the capacitor C3 and the positive polarity end of the output side; the negative polarity end of the capacitor C3 is connected with the negative polarity end of the capacitor C1, the anode of the diode D3 and the negative polarity end of the output side respectively.
Further, the main control switch S is a silicon-based MOSFET, a silicon carbide MOSFET, a gallium nitride MOSFET, an IGBT, or an IPM.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a follow current loop consisting of a capacitor C1 and a diode D3 is connected with a follow current loop consisting of a capacitor C2 and a diode D2 in an X-type network mode, the whole converter circuit only comprises a main control active switch, and when the main control switch S is conducted, the capacitor C1 in the follow current loop is connected with the capacitor C2 in the original follow current loop in series; when the main control switch S is turned off, the capacitor C1 in the freewheeling circuit is connected in parallel with the capacitor C2 in the original freewheeling circuit. The branch circuits of the capacitor C1 and the capacitor C2 have no electrical cross-connection nodes, so that the load can obtain the sum of the voltages of the two capacitors, and a higher voltage boosting ratio can be realized.
Drawings
Fig. 1 is a schematic circuit diagram of a household photovoltaic power generation power optimizer with a high step-up ratio according to the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
As shown in fig. 1, a household photovoltaic power generation power optimizer with a high step-up ratio comprises a master switch S, a capacitor C1, a diode D2, a capacitor C2, a diode D3 and a diode D1; the anode and the cathode of the diode D2 are respectively connected with the positive polarity end of the capacitor C1 and the positive polarity end of the capacitor C2; the anode and the cathode of the diode D3 are connected to the negative terminal of the capacitor C1 and the negative terminal of the capacitor C2, respectively. The drain of the main control switch S is connected to the anode of the diode D2 and the positive terminal of the capacitor C1, an inductor L1 is connected in series between the positive terminal of the input side and the drain of the main control switch S, and the diode D1 is a parasitic body diode of the main control switch S. The source of the master switch S is connected to the cathode of the diode D3 and to the negative terminal of the input side. The freewheeling circuit formed by capacitor C1 and diode D3 together with the freewheeling circuit formed by capacitor C2 and diode D2 provide energy to the output. The two freewheel loops are connected in an X-type fashion, the output MN of the X-type network being followed by a low-pass filter consisting of L2 and C3. The anode of the diode D3 is connected to the output side negative polarity terminal.
The passive power devices in the converter, such as diode D1, diode D2, and diode D3, may be conventional silicon-based diodes or silicon carbide diodes. The master active switch in the converter, e.g. the master switch S, may be a silicon based MOSFET, a silicon carbide MOSFET, a gallium nitride MOSFET, an IGBT or an IPM (intelligent power module).
When the master switch S is turned on, the voltage across the inductor L1 is the input voltage Vi, the diodes D2 and D3 are reversely biased off, and the capacitors C1 and C2 are connected in series to supply power to the load. When the master switch S is turned off, the capacitors C1, C2 are changed from series to parallel, receiving the energy supplement of the input Vi and the inductor L1. The variable connection relationship of the inductors C1 and C2 enables the load to obtain the sum of the voltages of the two capacitors in a part of time period, so that higher voltage boosting ratio can be realized.
Since the diode D3 is connected across the input side ground and the output side ground, the input side and the output side are not grounded in common, and the common mode noise of the entire converter needs to be of particular concern. Corresponding noise suppression measures are to increase the inductance of the common mode inductor when designing the input side electromagnetic interference filter or to adopt a multi-stage filter to increase the noise attenuation rate. And the noise of a high-frequency part is suppressed by matching with the use of a Y capacitor and good layout. In this converter, the source of the main control switch S is directly connected to the input-side ground. However, since the input side and the output side are not commonly grounded, a voltage variation between the source and the output side ground should be considered when designing the driving circuit of the main control switch S. One approach is to use an isolated drive transformer for the drive. Under the condition of the same duty ratio, the gain of the novel high step-up ratio DC/DC converter is far larger than that of the traditional BOOST converter
The invention utilizes a follow current loop composed of a capacitor C1 and a diode D3 and a low-pass filter composed of an inductor L2 and a capacitor C3, wherein the filter is used for filtering high-frequency harmonic contained in the voltage of a port MN so as to enable the output voltage Vo to be relatively straight direct-current voltage. The whole converter circuit only contains one master active switch. When the main control switch S is conducted, the capacitor C1 in the follow current loop is connected with the capacitor C2 in the original follow current loop in series; when the main control switch S is turned off, the capacitor C1 in the freewheeling circuit is connected in parallel with the capacitor C2 in the original freewheeling circuit. The branch of each of the capacitor C1 and the capacitor C2 has no electrical cross-connection node.
The circuit structure adopts a topological form based on a dual follow current loop, and meanwhile, the whole circuit has the characteristics of a single active switch and a single-stage framework. With the rapid development of power semiconductor device technology, new semiconductor materials are continuously applied. In order to improve the conversion efficiency and power density of the converter and reduce electromagnetic interference, silicon carbide power devices can be used as the active switch and the passive switch. The novel power device has the characteristics of high switching frequency, high temperature resistance, radiation resistance, almost no reverse recovery and the like, and greatly reduces the switching loss and electromagnetic emission of the converter.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The household photovoltaic power generation power optimizer with the high step-up ratio is characterized by comprising a main control switch S, a capacitor C1, a diode D2, a capacitor C2 and a diode D3; the anode of the diode D2 is connected with the positive polarity end of the capacitor C1; the cathode of the diode D2 is connected with the positive polarity end of the capacitor C2; the anode of the diode D3 is connected with the negative polarity end of the capacitor C1; the cathode of the diode D3 is connected with the negative polarity end of the capacitor C2; the drain electrode of the main control switch S is simultaneously connected with the anode of the diode D2 and the positive polarity end of the capacitor C1; the source electrode of the main control switch S is simultaneously connected with the cathode of the diode D3 and the negative polarity end of the capacitor C2; the freewheeling circuit formed by the capacitor C1 and the diode D3 is connected with the freewheeling circuit formed by the capacitor C2 and the diode D2 in an X-shaped network mode; and the output MN of the X-type network is respectively connected with the positive polarity end and the negative polarity end of the output side.
2. The household photovoltaic power generation power optimizer with high step-up ratio as claimed in claim 1, wherein the source of the master switch S is connected to the negative terminal of the input side at the same time; and the drain electrode of the main control switch S is simultaneously connected with the positive polarity end of the input side.
3. The household photovoltaic power generation power optimizer as claimed in claim 2, wherein an inductor L1 is connected in series between the positive polarity terminal of the input side and the drain of the main control switch S.
4. The household photovoltaic power generation power optimizer as claimed in claim 2, wherein the master switch S comprises a diode D1.
5. The household photovoltaic power generation power optimizer of high step-up ratio as claimed in claim 4, wherein the diodes D1, D2 and D3 are ordinary silicon-based diodes or silicon carbide diodes.
6. The household photovoltaic power generation power optimizer with high step-up ratio as claimed in claim 1, wherein the output MN of the X-type network is connected with a low pass filter; the low-pass filter comprises an inductor L2 and a capacitor C3; one end of the inductor L2 is connected with the cathode of the diode D2 and the positive polarity end of the capacitor C2, and the other end is connected with the positive polarity end of the capacitor C3 and the positive polarity end of the output side; the negative polarity end of the capacitor C3 is connected with the negative polarity end of the capacitor C1, the anode of the diode D3 and the negative polarity end of the output side respectively.
7. The household photovoltaic power generation power optimizer of claim 1, wherein the master switch S is a silicon-based MOSFET, a silicon carbide MOSFET, a gallium nitride MOSFET, an IGBT or an IPM.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010418084.6A CN111641335A (en) | 2020-05-18 | 2020-05-18 | Household photovoltaic power generation power optimizer with high step-up ratio |
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| CN202010418084.6A CN111641335A (en) | 2020-05-18 | 2020-05-18 | Household photovoltaic power generation power optimizer with high step-up ratio |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183609A (en) * | 2018-01-04 | 2018-06-19 | 东南大学 | A kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system |
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- 2020-05-18 CN CN202010418084.6A patent/CN111641335A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183609A (en) * | 2018-01-04 | 2018-06-19 | 东南大学 | A kind of cascade connection type DC/DC converters of the asymmetric boosting unit of photovoltaic system |
Non-Patent Citations (2)
| Title |
|---|
| B. AXELROD ET AL.: ""Transformerless DC-DC converters with a very high DC line-to-load voltage ratio"", 《PROCEEDINGS OF THE 2003 INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, 2003. ISCAS "03.》《PROCEEDINGS OF THE 2003 INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, 2003. ISCAS "03.》 * |
| 蔡春伟: ""串联型高增益 Z 源逆变器及其应用研究"", 《中国博士学位论文全文数据库（电子期刊） 工程科技II辑》 * |
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Application publication date: 20200908 |