CN105186571A - Intelligent low-voltage ride through system of photovoltaic grid-connected inverter - Google Patents
Intelligent low-voltage ride through system of photovoltaic grid-connected inverter Download PDFInfo
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- CN105186571A CN105186571A CN201510697139.0A CN201510697139A CN105186571A CN 105186571 A CN105186571 A CN 105186571A CN 201510697139 A CN201510697139 A CN 201510697139A CN 105186571 A CN105186571 A CN 105186571A
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- combining inverter
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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 relates to an intelligent low-voltage ride through system of a photovoltaic grid-connected inverter. The intelligent low-voltage ride through system comprises a control device, a main grid-connected inverter, an auxiliary grid-connected inverter, a filtering device, a main alternating current contactor, a voltage regulation transformer, a middle relay, a switch control device and a voltage sensor, wherein the control device is electrically connected with the main grid-connected inverter, the auxiliary grid-connected inverter, the filtering device, the main alternating current contactor and the switch control device through the middle relay respectively; the main grid-connected inverter and the auxiliary grid-connected inverter are connected in parallel with each other, and are electrically connected with a photovoltaic power generation device and the voltage regulation transformer; the voltage regulation transformer is connected with a power supply grid through the main alternating current contactor; the filtering device is mounted at a position between the voltage regulation transformer and the main alternating current contactor. The intelligent low-voltage ride through system can effectively simplify the system structure, improve the running stability, and effectively improve the running efficiency of a photovoltaic power generation system, and the running control precision.
Description
Technical field
The present invention relates to a kind of photovoltaic power generation control system, is exactly a kind of intelligent low voltage ride through system of photovoltaic combining inverter.
Background technology
Current photovoltaic generating system obtains to be applied very widely, and in actual use, by rectification process such as inversions, effectively achieve photovoltaic generating system and power supply grid is incorporated into the power networks, thus improve the usability of photovoltaic generating system greatly, but find in running, when because of failure and other reasons, electrical network occurs that voltage falls suddenly, photovoltaic generating system is owing to lacking corresponding counter-measure, therefore often there is photovoltaic generating system obscission from power supply grid, thus cause the power supply environment generation big ups and downs of power supply grid, even cause power supply grid fault time serious and cause large area blackout to occur, in order to address this problem, the current main practice is for photovoltaic generating system is equipped with low-voltage crossing sub-control system, to tackle power supply grid Voltage Drop phenomenon, but current low-voltage crossing system operationally, often by power-supply devices such as ups powers as auxiliary power source, run power for low-voltage crossing system provides and run control signal, although this mode to a certain degree can meet the needs used, but due to the power-supply device volumes such as ups power larger, therefore result in low-voltage crossing sub-control system structure larger, and build and operating cost higher, operation control corresponding speed simultaneously also due to power-supply devices such as ups powers is lower, and be vulnerable to external environment condition interference, operation stability is poor, therefore the operation stability that also result in current low-voltage crossing control subsystem is not enough, for this present situation, in the urgent need to developing a kind of invention low-voltage crossing control subsystem, with the needs that satisfied reality uses.
Summary of the invention
For the deficiency that prior art exists, the invention provides a kind of intelligent low voltage ride through system of photovoltaic combining inverter, this invention system framework framework is simple, integration degree is high, run automaticity high and build and operating cost cheap, effectively avoid the secondary power systems such as ups power as the System's composition driven on the one hand, thus reach while simplied system structure, improve system run all right, the effective operational efficiency improving photovoltaic generating system on the other hand, and improve the precision run and control, thus greatly improve grid-connected reliability of operation and stability.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of intelligent low voltage ride through system of photovoltaic combining inverter, comprise control device, main combining inverter, subordinate inverter, filter, main A.C. contactor, voltage regulating transformer, auxiliary relay, switch controlling device and voltage sensor, wherein control device by auxiliary relay respectively with main combining inverter, subordinate inverter, filter, main A.C. contactor, switch controlling device is electrically connected, main combining inverter, subordinate inverter is parallel with one another, and be electrically connected with photovoltaic power generation apparatus and voltage regulating transformer respectively, voltage regulating transformer is connected with power supply grid by main A.C. contactor, voltage sensor is electrically connected with power supply grid and control device respectively, filter is arranged on the position between voltage regulating transformer and main A.C. contactor, and connect with voltage regulating transformer and main A.C. contactor.
Further, described control device comprises data processing circuit, communicating circuit, drive circuit and expansion I/O port circuit, and drive circuit is electrically connected with data processing circuit, communicating circuit, expansion I/O port circuit and auxiliary relay respectively.
Further, described I/O port circuit is separately electrically connected with manipulation keyboard and display unit respectively.
Further, described communicating circuit comprises wireless communication module and online communication module.
Further, described main combining inverter and subordinate inverter include power bridge circuit, switch short device, control diode, regulate adjustable load circuits and control circuit, control circuit is electrically connected with power bridge circuit, switch short device respectively, and switch short device is another and control diode, regulate adjustable load circuits to be electrically connected.
Further, described switch short device at least two, and parallel with one another between each switch short device.
Further, described switch controlling device is igbt.
Present system framework framework is simple, integration degree is high, run automaticity high and build and operating cost cheap, effectively avoid the secondary power systems such as ups power as the System's composition driven on the one hand, thus reach while simplied system structure, improve system run all right, the effective operational efficiency improving photovoltaic generating system on the other hand, and improve the precision run and control, thus greatly improve grid-connected reliability of operation and stability.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is structural representation of the present invention.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
The intelligent low voltage ride through system of a kind of photovoltaic combining inverter as described in Figure 1, comprise control device 1, main combining inverter 2, subordinate inverter 3, filter 4, main A.C. contactor 5, voltage regulating transformer 6, auxiliary relay 7, switch controlling device 8 and voltage sensor 9, wherein control device 1 by auxiliary relay 7 respectively with main combining inverter 2, subordinate inverter 3, filter 4, main A.C. contactor 5, switch controlling device 8 is electrically connected, main combining inverter 2, subordinate inverter 3 is parallel with one another, and be electrically connected with photovoltaic power generation apparatus 10 and voltage regulating transformer 6 respectively, voltage regulating transformer 6 is connected with power supply grid 11 by main A.C. contactor 5, voltage sensor 9 is electrically connected with power supply grid 11 and control device 1 respectively, filter 4 is arranged on the position between voltage regulating transformer 6 and main A.C. contactor 5, and connect with voltage regulating transformer 6 and main A.C. contactor 5.
In the present embodiment, described control device 1 comprises data processing circuit, communicating circuit, drive circuit and expansion I/O port circuit, and drive circuit is electrically connected with data processing circuit, communicating circuit, expansion I/O port circuit and auxiliary relay respectively.
In the present embodiment, described I/O port circuit is separately electrically connected with manipulation keyboard and display unit respectively.
In the present embodiment, described communicating circuit comprises wireless communication module and online communication module.
In the present embodiment, described main combining inverter 2 and subordinate inverter 3 include power bridge circuit, switch short device, control diode, regulate adjustable load circuits and control circuit, control circuit is electrically connected with power bridge circuit, switch short device respectively, and switch short device is another and control diode, regulate adjustable load circuits to be electrically connected.
In the present embodiment, described switch short device 8 at least two, and parallel with one another between each switch short device.
In the present embodiment, described switch controlling device 8 is igbt.
Present system framework framework is simple, integration degree is high, run automaticity high and build and operating cost cheap, effectively avoid the secondary power systems such as ups power as the System's composition driven on the one hand, thus reach while simplied system structure, improve system run all right, the effective operational efficiency improving photovoltaic generating system on the other hand, and improve the precision run and control, thus greatly improve grid-connected reliability of operation and stability.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (7)
1. the intelligent low voltage ride through system of a photovoltaic combining inverter, it is characterized in that: the intelligent low voltage ride through system of described photovoltaic combining inverter comprises control device, main combining inverter, subordinate inverter, filter, main A.C. contactor, voltage regulating transformer, auxiliary relay, switch controlling device and voltage sensor, wherein said control device by auxiliary relay respectively with main combining inverter, subordinate inverter, filter, main A.C. contactor, switch controlling device is electrically connected, described main combining inverter, subordinate inverter is parallel with one another, and be electrically connected with photovoltaic power generation apparatus and voltage regulating transformer respectively, described voltage regulating transformer is connected with power supply grid by main A.C. contactor, described voltage sensor is electrically connected with power supply grid and control device respectively, described filter is arranged on the position between voltage regulating transformer and main A.C. contactor, and connect with voltage regulating transformer and main A.C. contactor.
2. the intelligent low voltage ride through system of a kind of photovoltaic combining inverter according to claim 1, it is characterized in that, described control device comprises data processing circuit, communicating circuit, drive circuit and expansion I/O port circuit, and drive circuit is electrically connected with data processing circuit, communicating circuit, expansion I/O port circuit and auxiliary relay respectively.
3. the intelligent low voltage ride through system of a kind of photovoltaic combining inverter according to claim 2, is characterized in that, described I/O port circuit is separately electrically connected with manipulation keyboard and display unit respectively.
4. the intelligent low voltage ride through system of a kind of photovoltaic combining inverter according to claim 2, is characterized in that, described communicating circuit comprises wireless communication module and online communication module.
5. the intelligent low voltage ride through system of a kind of photovoltaic combining inverter according to claim 1, it is characterized in that, described main combining inverter and subordinate inverter include power bridge circuit, switch short device, control diode, regulate adjustable load circuits and control circuit, control circuit is electrically connected with power bridge circuit, switch short device respectively, and switch short device is another and control diode, regulate adjustable load circuits to be electrically connected.
6. the intelligent low voltage ride through system of a kind of photovoltaic combining inverter according to claim 1, is characterized in that, described switch short device at least two, and parallel with one another between each switch short device.
7. the intelligent low voltage ride through system of a kind of photovoltaic combining inverter according to claim 1, is characterized in that, described switch controlling device is igbt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510697139.0A CN105186571B (en) | 2015-10-23 | 2015-10-23 | A kind of intelligent low voltage ride through system of photovoltaic combining inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510697139.0A CN105186571B (en) | 2015-10-23 | 2015-10-23 | A kind of intelligent low voltage ride through system of photovoltaic combining inverter |
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| CN105186571A true CN105186571A (en) | 2015-12-23 |
| CN105186571B CN105186571B (en) | 2018-08-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060227579A1 (en) * | 2005-04-12 | 2006-10-12 | Det International Holding Limited | Power supply arrangement |
| CN202749834U (en) * | 2012-06-21 | 2013-02-20 | 天宝电子（惠州）有限公司 | Low-voltage ride through device of photovoltaic grid-connected inverter |
| CN103250319A (en) * | 2010-10-12 | 2013-08-14 | 施耐德电气太阳能逆变器美国股份有限公司 | Photovoltaic inverter with control for performing low voltage ride through |
| CN205029352U (en) * | 2015-10-23 | 2016-02-10 | 苏州华安普电力科技股份有限公司 | Photovoltaic grid -connected inverter's intelligent low voltage ride through system |
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2015
- 2015-10-23 CN CN201510697139.0A patent/CN105186571B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060227579A1 (en) * | 2005-04-12 | 2006-10-12 | Det International Holding Limited | Power supply arrangement |
| CN103250319A (en) * | 2010-10-12 | 2013-08-14 | 施耐德电气太阳能逆变器美国股份有限公司 | Photovoltaic inverter with control for performing low voltage ride through |
| CN202749834U (en) * | 2012-06-21 | 2013-02-20 | 天宝电子（惠州）有限公司 | Low-voltage ride through device of photovoltaic grid-connected inverter |
| CN205029352U (en) * | 2015-10-23 | 2016-02-10 | 苏州华安普电力科技股份有限公司 | Photovoltaic grid -connected inverter's intelligent low voltage ride through system |
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| CN105186571B (en) | 2018-08-24 |
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