CN203219200U - Three-phase high power factor grid-connected inverter - Google Patents
Three-phase high power factor grid-connected inverter Download PDFInfo
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- CN203219200U CN203219200U CN 201320214336 CN201320214336U CN203219200U CN 203219200 U CN203219200 U CN 203219200U CN 201320214336 CN201320214336 CN 201320214336 CN 201320214336 U CN201320214336 U CN 201320214336U CN 203219200 U CN203219200 U CN 203219200U
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- current
- power factor
- filter
- grid
- high power
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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
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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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The utility model discloses a three-phase high power factor grid-connected inverter. The utility model aims at providing a three-phase high power factor grid-connected inverter. The three-phase high power factor grid-connected inverter comprises a filter and is characterized in that one end of the filter is connected with a power grid through a three-phase transformer, the other end of the filter is connected with an inversion controller through a variable flow unit, and the filter is also directly connected with the variable flow controller. The three-phase high power factor grid-connected inverter mainly is used for the grid-connected operation of a four-quadrant operation inverter, wind power generation, photovoltaic generation and other distributed power generation.
Description
Technical field
The utility model relates to a kind of grid-connected converter, relates in particular to a kind of three-phase high power factor grid-connected converter.
Background technology
At present; continuous development and maturation along with power electronic device; especially large-scale application IGBT(insulated gate bipolar transistor); make large power all-controlled full-bridge type current transformer be able to fast development, emerging distributed power generations such as four-quadrant frequency converter, wind power generation, photovoltaic generation also are able to scale and use.But IGBT is a kind of HF switch element, in its commutation course because the high-frequency high order harmonic component that turns on and off generation has caused the serious distortion of voltage on line side and current waveform, simultaneously along with the phase deviation of the variation voltage on line side of current transformer load and electric current also along with change.The voltage and current that has distorted can cause fatal danger to other power consumption equipment owing to contain serious pollution (high order harmonic component), so the three phase mains that the current transformer inversion goes out can not directly be incorporated into the power networks.In addition, because the voltage on line side that the work of current transformer causes and the phase deviation of electric current can cause very big reactive power, net side power factor is descended, can cause the serious heating of other power consumption equipment.So current transformer is if be incorporated into the power networks also necessary control and the compensation of considering its power factor.
Generally, between current transformer and electrical network, install inductance formation passive filter additional and come the humorous power factor of improving current transformer that involves of filtering current on line side.But this mode is feasible for the small-power current transformer, in case the power of current transformer increases, the volume of required inductance also increases thereupon, and filtering simultaneously and power-factor improvement performance also descend thereupon.
Summary of the invention
The purpose of this utility model is to provide a kind of three-phase high power factor grid-connected converter, to solve the above-mentioned problem that exists.
For achieving the above object, technical solution of the present invention is: a kind of three-phase high power factor grid-connected converter, comprise filter, it is characterized in that: an end of described filter links to each other with electrical network by three-phase transformer, the other end links to each other with current-variable controller by current transforming unit, and filter also directly links to each other with current-variable controller.
The beneficial effects of the utility model are: by the redesign of grid-connected converter, not only realized reliably being incorporated into the power networks of current transformer, improved the power factor of current transformer greatly simultaneously, and it is minimum that side harmonics content is dropped to.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is electrical schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model and embodiment thereof are described in further detail.
Referring to Fig. 1-2, the utility model comprises filter, it is characterized in that: an end of described filter links to each other with electrical network by three-phase transformer, and the other end links to each other with current-variable controller by current transforming unit, and filter also directly links to each other with current-variable controller.
The input of three-phase transformer TC1 connects electrical network, and the output of transformer links to each other with the input of filter (LCL filter).Three-phase transformer plays the function of current transformer and electrical network isolation, flowing through the residue harmonic wave that carries in the electric current of LCL filter and the voltage isolates with electrical network again, because there is inductance in transformer itself, through behind the transformer, make the current waveform sineization that exchanges to electrical network simultaneously.
Three pole reactor L1, L2 and three-phase capacitance-resistance device Cr have constituted three-phase LCL filter, the input of filter links to each other with the output of three-phase transformer TC1, output links to each other with the three phase full bridge current transforming unit by Hall element CT1-CT3, and the output of filter also links to each other with current-variable controller simultaneously.
Three-phase LCL filter is the key equipment that current transformer is incorporated into the power networks, L2 and current transforming unit, current-variable controller form the filtering of single order L type together, filtering the high order harmonic component in the current transformer current on line side, play the function that the current transformer DC bus-bar voltage of keeping and raise, electric current are followed the tracks of fast simultaneously.Cr is parallel to the input end of output and the L2 of L1, forms second order LCL filter, the voltage and current high order harmonic component of filtering current transformer net side with L1, L2.The resistance R 1-R3 that respectively connects on the capacitor C 1-C3 simultaneously, the damping action when playing LCL and producing vibration.
Current transforming unit is made of dc capacitor Cd and IGBT V1-V3, and the net side of current transforming unit links to each other with the output of filter, and the IGBT module of current transforming unit links to each other with current-variable controller simultaneously.
Current transforming unit is the key equipment that current transformer carries out the alternating current-direct current change of current, by IGBT according to certain open the shutoff order with AC rectification be direct current or with dc inversion for exchanging.Dc capacitor Cd plays energy storage and reduces the function of busbar voltage ripple.
Current-variable controller AP1 is the control centre of current transformer, and it is connected with the three-phase input end of LCL filter, the Hall element of current transforming unit and the IGBT of current transforming unit.
Current-variable controller is gathered voltage magnitude and the phase place of LCL filter three-phase input end, gather current on line side value and the phase place of current transforming unit simultaneously by Hall element, in controller inside by the phase deviation of circuit and program comparative voltage and electric current, utilize this departure to adjust the PWM(pulse-width modulation waveform of controller) output, thereby control IGBT turns on and off, and then realize the synchronous of voltage on line side and current on line side phase place, reach the purpose of current transforming unit unity power factor control.By the unity power factor control of current-variable controller, can adjust the power factor of current transformer in real time according to the load variations situation of current transforming unit, the final purpose that realizes dynamically improving the current transformer power factor.
Claims (1)
1. three-phase high power factor grid-connected converter, comprise filter, it is characterized in that: an end of described filter links to each other with electrical network by three-phase transformer, and the other end links to each other with current-variable controller by current transforming unit, and filter also directly links to each other with current-variable controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214336 CN203219200U (en) | 2013-04-25 | 2013-04-25 | Three-phase high power factor grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214336 CN203219200U (en) | 2013-04-25 | 2013-04-25 | Three-phase high power factor grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203219200U true CN203219200U (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320214336 Expired - Lifetime CN203219200U (en) | 2013-04-25 | 2013-04-25 | Three-phase high power factor grid-connected inverter |
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| Country | Link |
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| CN (1) | CN203219200U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672343A (en) * | 2018-12-17 | 2019-04-23 | 华为技术有限公司 | A kind of phase calibration circuitry of receiving end, method and receiving end |
-
2013
- 2013-04-25 CN CN 201320214336 patent/CN203219200U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672343A (en) * | 2018-12-17 | 2019-04-23 | 华为技术有限公司 | A kind of phase calibration circuitry of receiving end, method and receiving end |
| US11038433B2 (en) | 2018-12-17 | 2021-06-15 | Huawei Technologies Co., Ltd. | Phase alignment circuit and method of receive end, and receive end |
| US11482941B2 (en) | 2018-12-17 | 2022-10-25 | Huawei Technologies Co., Ltd. | Phase alignment circuit and method of receive end, and receive end |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130925 |
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| CX01 | Expiry of patent term |