CN203522212U - Photovoltaic power station system possessing low voltage ride through and anti-island protection functions - Google Patents
Photovoltaic power station system possessing low voltage ride through and anti-island protection functions Download PDFInfo
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- CN203522212U CN203522212U CN201320555018.9U CN201320555018U CN203522212U CN 203522212 U CN203522212 U CN 203522212U CN 201320555018 U CN201320555018 U CN 201320555018U CN 203522212 U CN203522212 U CN 203522212U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a photovoltaic power station system possessing low voltage ride through and anti-island protection functions. The photovoltaic power station system possessing the low voltage ride through and anti-island protection functions comprises a photovoltaic power generation system array, a first breaker, a three-phase inverter, a filter, a parameter detection module, a load, a second breaker, a transformer, a power grid and a controller. A current outputted by the photovoltaic power generation system array passes the first breaker, the three-phase inverter and the filter orderly to be inputted to the input end of the parameter detection module, one output of the parameter detection module is connected with the load, and the other output is connected with the power grid via the transformer and the second breaker. The parameter detection module detects a switch signal of the second breaker and a voltage V and a frequency f at the coupling point of the parameter detection module and the load, and outputs the switch signal, the voltage V and the frequency f to the input end of the controller. One output end of the controller is connected with the inverter to provide a PWM signal to the inverter, and the other output end is connected with the first breaker. The photovoltaic power station system of the utility model enables the low voltage ride through and anti-island protection functions to coexist, thereby realizing the advantage of enhancing the stability and security of the photovoltaic power station system.
Description
Technical field
The utility model relates to field of photovoltaic power generation, particularly, relates to a kind of photovoltaic power station system with low voltage crossing and anti-island protect function.
Background technology
Low voltage crossing technology (LVRT) puts forward the earliest in wind generator system, when referring to that for photovoltaic generating system grid-connected point voltage falls, it is grid-connected that photovoltaic apparatus can keep, even to electrical network, provide certain reactive power, support power system restoration, until power system restoration is normal, thus " passing through " this low-voltage time (region).Along with the quick increase of solar energy power generating installation ratio, electrical network has had higher requirement for the low voltage ride-through capability of grid-connected photovoltaic power station.Photovoltaic plant externally electric network fault, be particularly uninterruptedly incorporated into the power networks during line voltage rapid drawdown fault.Low voltage ride-through capability is considered to one of ultimate challenge in grid-connected equipment design and manufacturing technology, is directly connected to the large-scale application of photovoltaic generation.
Island effect is the problem that distributed generation system should be noted that, grid-connected photovoltaic system needs to consider equally.Island effect relates to a region in public power system, works as electric network fault, and while requiring distributed system to stop power supply, but the electric supply installation of distributed system is still in bringing onto load work, forms the uncontrollable electric power isolated island of Yi Ge Utilities Electric Co..In order to protect the stable and power grid maintenance personnel's of grid-connected photovoltaic system, electrical network safety, island protect function need to be set in photovoltaic parallel in system.
And isolated island detects, the isolated island being mainly divided into based on communication detects and local isolated island detects.Isolated island based on communication detects and mainly contains cascading trip and power line carrier communication.Local isolated island detects and is mainly divided into passive type and active, and what passive type generated electricity by way of merging two or more grid systems device and electrical network interface voltage or frequency by detection detects island effect extremely.
And photovoltaic plant only possesses low voltage ride-through function or a kind of function of anti-island protect now, photovoltaic plant is formed to very large threat.Because of the contradiction existing between photovoltaic plant low voltage crossing and anti-island protect, thereby island protect generation misoperation threatens power network safety operation in low voltage crossing process, during photovoltaic plant isolated island, the low voltage ride-through capability of inverter easily causes anti-island protect tripping, thereby cause equipment damage, threaten maintainer's personal safety; And isolated island detects, the isolated island being mainly divided into based on communication detects and local isolated island detects.Isolated island based on communication detects and mainly contains cascading trip and power line carrier communication.Local isolated island detects and is mainly divided into passive type and active, and what passive type generated electricity by way of merging two or more grid systems device and electrical network interface voltage or frequency by detection detects island effect extremely.
Utility model content
The purpose of this utility model is, for the problems referred to above, proposes a kind of photovoltaic power station system with low voltage crossing and anti-island protect function, and low voltage crossing and anti-island protect are coexisted to realize the advantage that strengthens photovoltaic power station system stability and fail safe.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of photovoltaic power station system with low voltage crossing and anti-island protect function, comprise photovoltaic generating system array, the first circuit breaker, three-phase inverter, filter, parameter detection module, load, the second circuit breaker, transformer, electrical network, controller, the electric current of described photovoltaic generating system array output is successively through the first circuit breaker, the input of three-phase inverter and filter input parameter detection module, described parameter detection module one tunnel is connected with load, separately lead up to transformer, the second circuit breaker is connected with electrical network, described parameter detection module detects the switching signal of the second circuit breaker, and voltage V and the frequency f at parameter detection module and load coupling point place, and exported to the input of controller, output one tunnel of described controller is connected with inverter, for inverter provides pwm signal, one tunnel is connected with the first circuit breaker.
According to preferred embodiment of the present utility model, described controller comprises Detection & Controling module and PWM generator, the input of described Detection & Controling module is connected with the output of above-mentioned parameter detection module, the output of described Detection & Controling module is connected with the first circuit breaker with PWM generator respectively, and the output of described PWM generator is connected with the input of above-mentioned three-phase inverter.
According to preferred embodiment of the present utility model, described Detection & Controling module adopts dsp processor.
According to preferred embodiment of the present utility model, described parameter detection module at least comprises the voltage transformer and the three-phase phase-locked loop circuit that is used for detecting frequency signal f for detectable voltage signals V.
The technical solution of the utility model has following beneficial effect:
The technical solution of the utility model; by checking the switching signal of electrical network circuit breaker; and voltage signal v and frequency signal f; by the judgement of controller; and by controlling the first circuit breaker, realized isolated island judgement and anti-island protect function, and by three-phase inverter is set, realized the function of low voltage crossing; thereby low voltage crossing and anti-island protect function are coexisted, reached the object that strengthens photovoltaic power station system stability and fail safe.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the photovoltaic power station system with low voltage crossing and anti-island protect function described in the utility model embodiment;
Fig. 2 is the course of work flow chart of the photovoltaic power station system with low voltage crossing and anti-island protect function described in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.
As shown in Figure 1, a kind of photovoltaic power station system with low voltage crossing and anti-island protect function, comprise photovoltaic (PV) electricity generation system array, the first circuit breaker, three-phase inverter, filter, parameter detection module, load, the second circuit breaker, transformer, electrical network, controller, the electric current of photovoltaic generating system array output is successively through the first circuit breaker, the input of three-phase inverter and filter input parameter detection module, parameter detection module one tunnel is connected with load, separately lead up to transformer, the second circuit breaker is connected with electrical network, parameter detection module detects the switching signal of the second circuit breaker, and voltage V and the frequency f at parameter detection module and load coupling point place, and exported to the input of controller, output one tunnel of controller is connected with inverter, for inverter provides pwm signal, one tunnel is connected with the first circuit breaker.Parameter detection module and load coupling are put the PCC place in i.e. figure, and the point of common coupling of distributed power source and electrical network.
Controller comprises Detection & Controling module and PWM generator, the input of Detection & Controling module is connected with the output of parameter detection module, the output of Detection & Controling module is connected with the first circuit breaker with PWM generator respectively, and the output of PWM generator is connected with the input of above-mentioned three-phase inverter.Detection & Controling module adopts dsp processor.Parameter detection module at least comprises the voltage transformer and the three-phase phase-locked loop circuit that is used for detecting frequency signal f for detectable voltage signals V.
To disconnect photovoltaic plant.When photovoltaic power station system receives the cut-off signal of the second circuit breaker, or meet and judge that isolated island occurs in conjunction with the local voltage signal V detecting and frequency signal f, controller sends trip signal and controls the first circuit breaker and disconnect, and cuts off distributed generation system.When photovoltaic plant device does not receive the cut-off signal of the second circuit breaker, and this locality when voltage signal v being detected and falling three-phase inverter realize low voltage crossing.
All conducting operations of the first circuit breaker, three-phase inverter, circuit breaker during normal operation.While the second circuit breaker being disconnected due to certain fault, the generation of this event can be detected by several detection modules and controller in circuit, and control the first circuit breaker disconnection.
As shown in Figure 2, the specific works process of photovoltaic power station system with low voltage crossing and anti-island protect function is as follows, parameter detection module detectable voltage signals v and frequency signal f, and the input signal using voltage signal v and frequency signal f as Detection & Controling module;
Voltage signal v and frequency signal f that Detection & Controling module reception number detection module transmits carry out threshold values judgement, and produce pwm control signal by PWM generator;
As voltage and any one value of frequency have surpassed, preset 5 cycles of threshold values, send trip signal and control the first circuit breaker, thereby make whole electric power station system out of service.
Detection & Controling module testing process is specific as follows: the 1) switching signal of the second circuit breaker of parameter detection module collection judge whether the second circuit breaker disconnects, when collecting the second circuit breaker cut-off signal, is judged as isolated island and occurs;
2) as parameter detection module, do not collect the cut-off signal of the second circuit breaker, but the voltage signal v and the frequency signal f that detect meet
,
or
, judge that isolated island occurs; When isolated island occurs, controller disconnects photovoltaic plant by controlling three-phase inverter within 5 cycles.The cycle of parameter detection module collection is 0.02s, wherein
while representing normal operation, the rated voltage of photovoltaic plant, is photovoltaic plant nominal parameter.
Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. a photovoltaic power station system with low voltage crossing and anti-island protect function, it is characterized in that, comprise photovoltaic generating system array, the first circuit breaker, three-phase inverter, filter, parameter detection module, load, the second circuit breaker, transformer, electrical network, controller, the electric current of described photovoltaic generating system array output is successively through the first circuit breaker, the input of three-phase inverter and filter input parameter detection module, described parameter detection module one tunnel is connected with load, separately lead up to transformer, the second circuit breaker is connected with electrical network, described parameter detection module detects the switching signal of the second circuit breaker, and voltage V and the frequency f at parameter detection module and load coupling point place, and exported to the input of controller, output one tunnel of described controller is connected with inverter, for inverter provides pwm signal, one tunnel is connected with the first circuit breaker.
2. the photovoltaic power station system with low voltage crossing and anti-island protect function according to claim 1; it is characterized in that; described controller comprises Detection & Controling module and PWM generator; the input of described Detection & Controling module is connected with the output of above-mentioned parameter detection module; the output of described Detection & Controling module is connected with the first circuit breaker with PWM generator respectively, and the output of described PWM generator is connected with the input of above-mentioned three-phase inverter.
3. the photovoltaic power station system with low voltage crossing and anti-island protect function according to claim 2, is characterized in that, described Detection & Controling module adopts dsp processor.
4. according to the arbitrary described photovoltaic power station system with low voltage crossing and anti-island protect function of claims 1 to 3; it is characterized in that, described parameter detection module at least comprises the voltage transformer and the three-phase phase-locked loop circuit that is used for detecting frequency signal f for detectable voltage signals V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320555018.9U CN203522212U (en) | 2013-09-09 | 2013-09-09 | Photovoltaic power station system possessing low voltage ride through and anti-island protection functions |
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| CN201320555018.9U CN203522212U (en) | 2013-09-09 | 2013-09-09 | Photovoltaic power station system possessing low voltage ride through and anti-island protection functions |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475022A (en) * | 2013-09-09 | 2013-12-25 | 国家电网公司 | Photovoltaic power station system with low voltage ride through and anti-islanding protection functions |
| CN103887811A (en) * | 2013-11-04 | 2014-06-25 | 汤奕 | Distributed power supply system and control method with low voltage ride through and anti-islanding protective functions |
| CN108603907A (en) * | 2016-02-03 | 2018-09-28 | 通用电气公司 | System and method for monitoring and diagnosing transformer health |
| US10782360B2 (en) | 2015-05-04 | 2020-09-22 | General Electric Company | Systems and methods for monitoring and diagnosing transformer health |
-
2013
- 2013-09-09 CN CN201320555018.9U patent/CN203522212U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475022A (en) * | 2013-09-09 | 2013-12-25 | 国家电网公司 | Photovoltaic power station system with low voltage ride through and anti-islanding protection functions |
| CN103475022B (en) * | 2013-09-09 | 2018-09-21 | 国家电网公司 | Photovoltaic power station system with low voltage crossing and anti-isolated island defencive function |
| CN103887811A (en) * | 2013-11-04 | 2014-06-25 | 汤奕 | Distributed power supply system and control method with low voltage ride through and anti-islanding protective functions |
| US10782360B2 (en) | 2015-05-04 | 2020-09-22 | General Electric Company | Systems and methods for monitoring and diagnosing transformer health |
| CN108603907A (en) * | 2016-02-03 | 2018-09-28 | 通用电气公司 | System and method for monitoring and diagnosing transformer health |
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| C14 | Grant of patent or utility model | ||
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Effective date of registration: 20171128 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: GANSU ELECTRIC POWER Corp. Patentee after: State Grid Corporation of China Co-patentee after: NARI TECHNOLOGY Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: GANSU ELECTRIC POWER Corp. Patentee before: State Grid Corporation of China Co-patentee before: NANJING NARI Group Corp. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140402 |
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| CX01 | Expiry of patent term |