CN103475022A - Photovoltaic power station system with low voltage ride through and anti-islanding protection functions - Google Patents
Photovoltaic power station system with low voltage ride through and anti-islanding protection functions Download PDFInfo
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- CN103475022A CN103475022A CN2013104041773A CN201310404177A CN103475022A CN 103475022 A CN103475022 A CN 103475022A CN 2013104041773 A CN2013104041773 A CN 2013104041773A CN 201310404177 A CN201310404177 A CN 201310404177A CN 103475022 A CN103475022 A CN 103475022A
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Abstract
The invention discloses a photovoltaic power station system with low voltage ride through and anti-islanding protection functions. The photovoltaic power station system comprises a photovoltaic power generation system array, a first breaker, a three-phase inverter, a filter, a parameter detecting module, a loader, a second breaker, a transformer, a power grid and a controller. The output current of the photovoltaic power generation system array sequentially passes through the first breaker, the three-phase inverter and the filter to be input into the input end of the parameter detecting module, one path of the parameter detecting module is connected with the loader, the other path of the parameter detecting module is connected with the power grid through the transformer and the second breaker, the parameter detecting module can detect switch signals of the second breaker and the voltage V and the frequency f of the coupled point between the parameter detecting module and the loader and input the switch signals, the voltage V and the frequency f to the input end of the controller, one path of the output end of the controller is connected with the inverter to provide PWM signals to the inverter, and the other path of the output end of the controller is connected with the first breaker. The photovoltaic power station system combines the low voltage ride through function and the anti-islanding protection function, so that the purpose of improving the stability and the safety of the photovoltaic power station system is achieved.
Description
Technical field
The present invention relates to field of photovoltaic power generation, particularly, relate 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 for photovoltaic generating system, referring to that 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 (zone).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, particularly uninterruptedly be incorporated into the power networks during line voltage rapid drawdown fault.Low voltage ride-through capability is considered to one of ultimate challenge on 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 zone in the 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 forms a uncontrollable electric power isolated island of Utilities Electric Co. still in bringing onto load work.Safety for the stable and power grid maintenance personnel that protect grid-connected photovoltaic system, electrical network need to arrange the island protect function in photovoltaic parallel in system.
And isolated island detects, the isolated island mainly be 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 mainly is 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 existed between photovoltaic plant low voltage crossing and anti-island protect, thereby island protect generation misoperation threatens power network safety operation in the low voltage crossing process, during the 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 mainly be 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 mainly is 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.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of photovoltaic power station system with low voltage crossing and anti-island protect function, low voltage crossing and anti-island protect are coexisted to realize strengthening to the advantage of photovoltaic power station system stability and fail safe.
For achieving the above object, the technical solution used in the present invention is:
A kind of photovoltaic power station system with low voltage crossing and anti-island protect function, comprise the 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, transformer is passed through on another road, 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 export it input of controller to, 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 a preferred embodiment of the invention, 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 a preferred embodiment of the invention, described Detection & Controling module adopts dsp processor.
According to a preferred embodiment of the invention, described parameter detection module at least comprises for the voltage transformer of detectable voltage signals V and is used for detecting the three-phase phase-locked loop circuit of frequency signal f.
According to a preferred embodiment of the invention, described parameter detection module detectable voltage signals v and frequency signal f, and the input signal using voltage signal v and frequency signal f as the Detection & Controling module;
Voltage signal v and frequency signal f that described Detection & Controling module reception number detection module transmits carry out the threshold values judgement, and produce pwm control signal by PWM generator;
Preset 5 cycles of threshold values as voltage and any one value of frequency have surpassed, send trip signal and control the first circuit breaker, thereby make whole electric power station system out of service.
According to a preferred embodiment of the invention, described 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, be judged as isolated island and occur;
2) do not collect the cut-off signal of the second circuit breaker as parameter detection module, but the voltage signal v detected and frequency signal f meets or, judge that isolated island occurs; When isolated island occurs, controller disconnects photovoltaic plant by controlling three-phase inverter within 5 cycles.
According to a preferred embodiment of the invention, it is characterized in that, the cycle of described parameter detection module collection is 0.02s.
Technical scheme of the present invention has following beneficial effect:
Technical scheme of the present invention; by checking the switching signal of electrical network circuit breaker; and voltage signal v and frequency signal f; judgement by controller; and, by controlling the first circuit breaker, realized the isolated island judgement and prevented the island protect function, and having realized the function of low voltage crossing by three-phase inverter is set; thereby low voltage crossing and anti-island protect function are coexisted, reached the purpose that strengthens photovoltaic power station system stability and fail safe.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The accompanying drawing explanation
Fig. 1 is the described theory diagram with photovoltaic power station system of low voltage crossing and anti-island protect function of the embodiment of the present invention;
Fig. 2 is the described course of work flow chart with photovoltaic power station system of low voltage crossing and anti-island protect function of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
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, transformer is passed through on another road, 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 export it input of controller to, 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.The 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 detected and frequency signal f, controller sends trip signal and controls the first circuit breaker and disconnect, and cuts off distributed generation system.When the 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 in circuit, due to certain fault, the second circuit breaker being disconnected, can the generation of this event be detected by several detection modules and controller, 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 the Detection & Controling module;
Voltage signal v and frequency signal f that Detection & Controling module reception number detection module transmits carry out the threshold values judgement, and produce pwm control signal by PWM generator;
Preset 5 cycles of threshold values as voltage and any one value of frequency have surpassed, 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) do not collect the cut-off signal of the second circuit breaker as parameter detection module, but the voltage signal v detected and frequency signal f meets 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 meaning normal operation, the rated voltage of photovoltaic plant, be the photovoltaic plant nominal parameter.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment, the present invention is had been described in detail, for a person skilled in the art, its technical scheme that still can put down in writing aforementioned each embodiment is modified, or part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the photovoltaic power station system with low voltage crossing and anti-island protect function, it is characterized in that, comprise the 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, transformer is passed through on another road, 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 export it input of controller to, 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.
5. the photovoltaic power station system with low voltage crossing and anti-island protect function according to claim 4, it is characterized in that, described parameter detection module detectable voltage signals v and frequency signal f, and the input signal using voltage signal v and frequency signal f as the Detection & Controling module;
Voltage signal v and frequency signal f that described Detection & Controling module reception number detection module transmits carry out the threshold values judgement, and produce pwm control signal by PWM generator, as having surpassed, voltage and any one value of frequency 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.
6. the photovoltaic power station system with low voltage crossing and anti-island protect function according to claim 5, it is characterized in that, described 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, be judged as isolated island and occur;
2) do not collect the cut-off signal of the second circuit breaker as parameter detection module, 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, wherein
while meaning normal operation, the rated voltage of photovoltaic plant, be the photovoltaic plant nominal parameter.
7. the photovoltaic power station system with low voltage crossing and anti-island protect function according to claim 5, is characterized in that, the cycle of described parameter detection module collection is 0.02s.
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| CN107706943A (en) * | 2017-11-10 | 2018-02-16 | 国家电网公司 | A kind of grid-connected open-circuit system of the lossless intelligent division of anti-isolated island with independent acquisition point and breaking method |
| CN111786412A (en) * | 2020-07-16 | 2020-10-16 | 北京诺飞新能源科技有限责任公司 | Crystalline silicon cell photovoltaic power generation system |
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