CN106451534A - Photovoltaic grid-connected island detection algorithm based on abrupt phase change and active phase shifting - Google Patents
Photovoltaic grid-connected island detection algorithm based on abrupt phase change and active phase shifting Download PDFInfo
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- CN106451534A CN106451534A CN201610819514.9A CN201610819514A CN106451534A CN 106451534 A CN106451534 A CN 106451534A CN 201610819514 A CN201610819514 A CN 201610819514A CN 106451534 A CN106451534 A CN 106451534A
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 230000010363 phase shift Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H02J3/383—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Inverter Devices (AREA)
Abstract
Disclosed is a photovoltaic grid-connected island detection algorithm based on abrupt phase change and active phase shifting. The photovoltaic grid-connected island detection algorithm comprises the steps of (1) collecting a grid-connected current frequency value, a common point voltage phase and a grid-connected current phase through a phase-locked loop apparatus; (2) setting upper and lower threshold values of a frequency, a common point voltage and a phase deviation threshold value of a grid-connected current; according to national island detection standard, setting the frequency threshold valve |f-f0| to be less than or equal to 0.5Hz; and setting the phase difference |delta <phi>| to be less than or equal to 2 degrees; and (3) when the grid-connected current frequency, or the common point voltage and the phase deviation of the grid-connected current exceed the corresponding threshold values, starting island protection; and when the current frequency of the grid-connected point and the |delta <phi>| are not greater than the corresponding threshold values, applying phase perturbation, wherein theta<SMS> is equal to 5 degrees sin(pi/2*delta f/3), on an inverted output current until the current frequency of the grid-connected point or the |delta <phi>| is greater than the corresponding threshold value, starting island protection. By adoption of the photovoltaic grid-connected island detection algorithm, seamless switching of different algorithms can be realized; detection blind regions can be reduced while the detection speed can be accelerated when a passive method is adopted singly; and in addition, the power grid current THD can be lowered when an active phase shifting method is adopted singly.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation.
Background technology
Islet operation is referred to when electrical network is due to the reason interruption of power supply such as electric fault, maloperation or natural cause, light
Volt microgrid electric power system continues to electrical network output electric energy and to local load supplying, so as to form an electricity as independent power supply
Net uncontrollable self-energizing isolated island.When distributed photovoltaic power generation system is in island operation state, electricity may be affected
Energy quality even damages electrical equipment, the personal safety of possible entail dangers to attendant when serious.Therefore, either from secure side
Face should timely and effectively detect island operation state still from from the aspect of reliability, all, and by photovoltaic DC-to-AC converter from public affairs
Junction point (PCC) place disconnection altogether, here it is isolated island detection.
And apply more isolated island detection algorithm to have passive isolated island detection method, active isolated island detection method at present.Passive isolated island
Detection method does not apply to disturb to electrical network, direct measurement grid entry point power frequency, and whether the parameter such as grid-connected voltage current and phase difference accords with
Close national standard to detect whether island effect occur, the advantage of passive means is not impact the electrical network quality of power supply, shortcoming
It is the grid entry point power frequency when bearing power is mated, the parameter such as grid-connected voltage current and phase difference can all meet national standard, because
There is larger check frequency in this；Active method is constantly to add disturbance to electrical network, when grid-connected generation, disturbs due to bulk power grid
Clamp down on and grid entry point power frequency will not be caused, the parameter such as grid-connected voltage current and phase difference exceedes threshold value, after isolated island occurs, does not have
Clamping down on for bulk power grid, grid entry point power frequency, the parameter such as grid-connected voltage current and phase difference is because the reason for adding disturbance exceedes
Threshold value, the advantage of active method is that check frequency is little, and detection speed is fast, but has the disadvantage to disturb the THD that can increase grid-connected voltage electric current.
Content of the invention
The purpose of the present invention is to propose to a kind of grid-connected isolated island detection algorithm based on SPA sudden phase anomalies and active phase shift, with
Solve the problems, such as that active method causes grid entry point electric current THD to increase big with passive means check frequency.
The present invention is achieved by the following technical solutions.
A kind of grid-connected isolated island detection algorithm based on SPA sudden phase anomalies and active phase shift of the present invention, including as follows
Step.
(1) grid-connected isolated island detection platform is built, using phase-locked loop apparatus collection grid-connected current frequency values, common point electricity
Pressure phase place and grid-connected current phase place.
(2) the phase deviation threshold value of the upper lower threshold value, public point voltage and grid-connected current of frequency is set.According to national isolated island
Examination criteria, arranging frequency threshold is | f-f0|<=0.5Hz, in formula, f is frequency measured value, f0For frequency reference；Phase contrast
(3) when the frequency of grid-connected current or the phase deviation of public point voltage and grid-connected current exceed threshold value, start lonely
Island is protected, and grid-connected current reference current amplitude is set to 0, and frequency configuration is 0.
When grid entry point power frequency andDuring not less than threshold value, phase perturbation θ is applied to inverter output currentSMS=5 °
Sin (pi/2 × Δ f/3), until grid entry point power frequency orMore than threshold value, start isolated island protection, grid-connected current is joined
Examine current amplitude and 0 is set to, frequency configuration is 0.
The feature and beneficial effect of the present invention：(1) the no seaming and cutting of algorithms of different are realized according to the situation of inversion output parameter
Change.(2) SPA sudden phase anomalies are combined with active phase shift isolated island detection algorithm and can reduce the check frequency that passive means is used alone and add
Fast detection speed, can reduce the THD of the power network current that active phase-shifting method is used alone.
Description of the drawings
Accompanying drawing 1 is the system construction drawing of the present invention.
Accompanying drawing 2 is the algorithm flow chart of the present invention.
Accompanying drawing 3 is the blind Range Analysis figure of the isolated island detection algorithm of the present invention.
The inverter current oscillogram that accompanying drawing 4 is gathered for the present invention.
Specific embodiment
The present invention is further illustrated with operation principle below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention is the grid-connected isolated island detection algorithm based on SPA sudden phase anomalies with active phase shift.Mainly
In grid-connected model, real-time sampling inverter output voltage electric current, inverter output current frequency is obtained by phase-locked loop apparatus
And phase place, output voltage phase place, whether different isolated islands are switched according to frequency and output current voltage phase difference more than threshold value
Detection algorithm, obtains reference current output, through PI controller, is the output of actual output current track reference, and control inversion is defeated
Go out the frequency of electric current or phase contrast deviates threshold value, and then inversion output is disconnected, realize the purpose of isolated island detection.
As shown in Fig. 2 the control method of the present invention comprises the steps：
(1) collection inverter output voltage, electric current, inverter output current frequency f is obtained by phase-locked loop apparatus, inversion is defeated
Go out voltage transient phase placeInverter output current instantaneous phaseReference frequency is f0=50Hz.
(2) judge | f-f0 |>0.5 HeIf two conditions, there is a satisfaction, start at once lonely
Island is protected, and it is 0 to arrange with reference to output current amplitude, and frequency is 0.
(3) if two conditions are all unsatisfactory for, apply phase perturbation,Then with reference to defeated
Go out electric currentIn formula, ts is the sampling interval, will be with reference to output current iref
Comparing with actual output current i, the output of reality output track reference is caused through PI control.
As shown in figure 3, the quality factor for arranging load are 2.5, and low-quality factor, 0.02s inverter after electrical network disconnects
Quit work, system detectio goes out isolated island, waveform is inverter output current waveform.
As shown in figure 4, the quality factor for arranging load are 5, and high quality factor, after electrical network disconnects, 0.02s inverter stops
Only work, system detectio goes out isolated island, waveform is inverter output current waveform.
Claims (1)
1. a kind of based on SPA sudden phase anomalies and the grid-connected isolated island detection algorithm of active phase shift, it is characterized in that comprising the steps：
(1) grid-connected isolated island detection platform is built, using phase-locked loop apparatus collection grid-connected current frequency values, public point voltage phase
Position and grid-connected current phase place；
(2) the phase deviation threshold value of the upper lower threshold value, public point voltage and grid-connected current of frequency is set；Detected according to national isolated island
Standard, arranging frequency threshold is | f-f0|<=0.5Hz, in formula, f is frequency measured value, f0For frequency reference；Phase contrast
(3) when the frequency of grid-connected current or the phase deviation of public point voltage and grid-connected current exceed threshold value, start isolated island guarantor
Shield, grid-connected current reference current amplitude is set to 0, and frequency configuration is 0；
When grid entry point power frequency andDuring not less than threshold value, phase perturbation θ is applied to inverter output currentSMS=5 ° of sin
(pi/2 × Δ f/3), until grid entry point power frequency orMore than threshold value, start isolated island protection, grid-connected current is referred to
Current amplitude is set to 0, and frequency configuration is 0.
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| CN201610819514.9A CN106451534A (en) | 2016-09-13 | 2016-09-13 | Photovoltaic grid-connected island detection algorithm based on abrupt phase change and active phase shifting |
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| CN201610819514.9A CN106451534A (en) | 2016-09-13 | 2016-09-13 | Photovoltaic grid-connected island detection algorithm based on abrupt phase change and active phase shifting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344902A (en) * | 2017-10-24 | 2018-07-31 | 广东电网有限责任公司汕头供电局 | Dead electricity judgment method and device in face of the flexible DC power transmission device for transporting inspection personnel |
| CN109193759A (en) * | 2018-09-07 | 2019-01-11 | 中国南方电网有限责任公司 | Photovoltaic generating system isolated island based on comprehensive detection protects control method |
| CN109217673A (en) * | 2018-11-06 | 2019-01-15 | 西安交通大学 | A kind of energy accumulation current converter and its control method |
| CN110247433A (en) * | 2019-07-10 | 2019-09-17 | 国网河南省电力公司焦作供电公司 | A kind of grid-connected island detection method based on improvement sliding formwork shift frequency method |
| CN110632413A (en) * | 2019-09-02 | 2019-12-31 | 国网吉林省电力有限公司 | Reactive power disturbance island detection method triggered in delayed mode |
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| CN103207335A (en) * | 2013-03-21 | 2013-07-17 | 中国农业大学 | Island detection method based on phase-frequency positive feedback |
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Cited By (7)
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| CN108344902A (en) * | 2017-10-24 | 2018-07-31 | 广东电网有限责任公司汕头供电局 | Dead electricity judgment method and device in face of the flexible DC power transmission device for transporting inspection personnel |
| CN108344902B (en) * | 2017-10-24 | 2021-06-29 | 广东电网有限责任公司汕头供电局 | Power loss judgment method and device for flexible direct current power transmission device facing inspection personnel |
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| CN109217673A (en) * | 2018-11-06 | 2019-01-15 | 西安交通大学 | A kind of energy accumulation current converter and its control method |
| CN110247433A (en) * | 2019-07-10 | 2019-09-17 | 国网河南省电力公司焦作供电公司 | A kind of grid-connected island detection method based on improvement sliding formwork shift frequency method |
| CN110247433B (en) * | 2019-07-10 | 2023-02-17 | 国网河南省电力公司焦作供电公司 | Photovoltaic grid-connected island detection method based on improved sliding mode frequency shift method |
| CN110632413A (en) * | 2019-09-02 | 2019-12-31 | 国网吉林省电力有限公司 | Reactive power disturbance island detection method triggered in delayed mode |
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Application publication date: 20170222 |