CN104821597A - Method for suppressing grid connection oscillation of photovoltaic power station system - Google Patents
Method for suppressing grid connection oscillation of photovoltaic power station system Download PDFInfo
- Publication number
- CN104821597A CN104821597A CN201510231125.XA CN201510231125A CN104821597A CN 104821597 A CN104821597 A CN 104821597A CN 201510231125 A CN201510231125 A CN 201510231125A CN 104821597 A CN104821597 A CN 104821597A
- Authority
- CN
- China
- Prior art keywords
- grid
- power station
- station system
- photovoltaic power
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000010355 oscillation Effects 0.000 title claims abstract description 8
- 230000001629 suppression Effects 0.000 claims description 21
- 230000000452 restraining effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 12
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- H02J3/383—
-
- 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
-
- 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 provides a method for suppressing grid connection oscillation of a photovoltaic power station system. The resonance frequency of the system and the equivalent reactance of each harmonic voltage are changed by changing the reactance at an output port of each grid-connected inverter or changing the reactance on a parallel bus, thereby suppressing the resonance occurring when multiple inverters are connected to a grid. The method is simple to implement, and can be used in all multi-machine grid-connection photovoltaic systems.
Description
Technical field
The present invention relates to a kind of method suppressing the grid-connected vibration of photovoltaic power station system, belong to field of photovoltaic power generation.
Background technology
Solar grid-connected inverter is a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT) photovoltaic panel direct current energy being converted to AC energy.In recent years, along with the contradiction of the energy demand increasingly increased and environmental problem is increasingly sharpened, and solar energy is as the important member in clean energy resource, is subject to the extensive concern of countries in the world.China's solar grid-connected installed capacity in recent years rapidly increases, power-assisted economic growth, allows everyone can enjoy green energy resource to the enhancement of environment brought of living.
Photovoltaic plant divides from scale and is generally divided into large-scale ground power station and two kinds, distributed power station, and the former is grid-connected larger, generally from a few MW to hundreds of MW not etc., generally adopts centralized inverter; Although the grid-connected small scale of the latter, because the inverter single-machine capacity forming distributed power station is little, so the inverter quantity in a system may be more.So many inverter composition system, be easy to, in grid-connected side, resonance occurs, finally causing cannot be normally grid-connected, or grid-connected harmonic excess, affects the quality of power supply.
Typical case's large-scale ground electric power station system composition schematic diagram is as Fig. 1.The distributed power station system composition schematic diagram of typical case's band transformer is as Fig. 2.The distributed power station system composition schematic diagram of typical case not with transformer is as Fig. 3.
Above three kinds of canonical systems, the number of units of inverter parallel is more, and system is more easily vibrated, reason is grid-connected transformer equivalent reactance, the output port equivalent reactance generation series resonance of inverter, affects the quality of power supply, serious resonance can allow whole photovoltaic system due to overcurrent off-grid.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method suppressing the grid-connected vibration of photovoltaic power station system is provided.
According to technical scheme provided by the invention, the method of the described grid-connected vibration of suppression photovoltaic power station system is: serial oscillation restraining device on inverter output end mouth or grid-connected bus, change the reactance composition in series loop, the equivalent reactance produced by described vibration suppression device is added in the former equivalent reactance of system, make the resonance frequency of series loop be the frequency range that in even or system, probability of occurrence is not high, suppress system generation resonance.
Described vibration suppression device can adopt inductance, or the string of inductance and electric capacity the reactance network formed.
Concrete, in large-scale ground electric power station system, described vibration suppression device of connecting between centralized inverter with grid-connected transformer.
In the distributed power station system that band transformer is grid-connected, described vibration suppression device of can connecting in the AC bus of each interchange header box, or described vibration suppression device of connecting on the former limit or secondary of total grid-connected transformer.
In not grid-connected with transformer distributed power station system, described vibration suppression device that the AC bus of each interchange header box is connected.
Advantage of the present invention is: by changing the reactance of combining inverter output port, or changing the reactance on bus in parallel, changing the resonance frequency of system and the equivalent reactance of each harmonic voltage, and then reach the object suppressing the grid-connected generation resonance of multi-inverter.The method realizes simple, can apply all multimachine grid-connected photovoltaic systems.
Accompanying drawing explanation
Fig. 1 is typical large-scale ground electric power station system composition schematic diagram.
Fig. 2 is the distributed power station system composition schematic diagram of typical case's band transformer.
Fig. 3 is the distributed power station system composition schematic diagram of typical case not with transformer.
Fig. 4 is the schematic diagram that large-scale ground power station increases vibration suppression device.
Fig. 5 is the schematic diagram that the distributed power station of being with transformer grid-connected increases vibration suppression device, comprise two kinds of modes, Fig. 5 (a) is serial oscillation restraining device in the AC bus of each interchange header box, and Fig. 5 (b) is serial oscillation restraining device on the former limit or secondary of total grid-connected transformer.
Fig. 6 does not increase vibration suppression device schematic diagram with the distributed power station that transformer is grid-connected.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
System configuration as shown in Figures 1 to 3, from grid side, the equivalence value of reactance is:
Z
GRID＝Z
TX+Z
INV
Wherein Z
gRIDfor electrical network equivalent reactance,
Z
tXfor transformer equivalent reactance,
Z
iNVfor inverter equivalent reactance.
Calculate and work as Z
gRIDfrequency f r when equaling 0 is the resonance frequency of system, if now grid side have this resonance frequency or therewith resonance frequency close to the harmonic voltage of frequency, form very large resonance current by Cascade System loop.
The present invention proposes a kind of method suppressing the grid-connected vibration of photovoltaic power station system.A series connection vibration suppression device on inverter output end mouth or grid-connected bus, changes the reactance composition in series loop, and then changes the resonance frequency of series loop, reach the object suppressing to vibrate.Namely in above-mentioned equivalent reactance, add another equivalent reactance, make resonance frequency be the frequency range that in even or system, probability of occurrence is not high, suppress system generation resonance, namely now from grid side, equiva lent impedance is:
Z
GRID＝Z
TX+Z
INV+Z
INHI
Wherein Z
iNHIfor the equivalent reactance of restraining device.
If Fig. 4 is the schematic diagram that large-scale ground power station increases vibration suppression device, between centralized inverter and grid-connected transformer, increase this device.
If Fig. 5 is the schematic diagram that the distributed power station of being with transformer grid-connected increases vibration suppression device, comprise two kinds of modes, Fig. 5 (a) is serial oscillation restraining device in the AC bus of each interchange header box, and Fig. 5 (b) is serial oscillation restraining device on the former limit or secondary of total grid-connected transformer.
As Fig. 6 does not increase vibration suppression device schematic diagram, this device that the AC bus of each interchange header box is connected with the distributed power station that transformer is grid-connected.
In Fig. 4 ~ 6, vibration suppression device is using inductor symbol as signal, actual includes but not limited to inductance when using, or the string of inductance and electric capacity the reactance network formed.According to on-the-spot actual inverter equivalent reactance, and the equivalent reactance relation of transformer, select suitable parameter to form this device.
Claims (6)
1. suppress the method for the grid-connected vibration of photovoltaic power station system, it is characterized in that: serial oscillation restraining device on inverter output end mouth or grid-connected bus, change the reactance composition in series loop, the equivalent reactance produced by described vibration suppression device is added in the former equivalent reactance of system, make the resonance frequency of series loop be the frequency range that in even or system, probability of occurrence is not high, suppress system generation resonance.
2. the as claimed in claim 1 method suppressing the grid-connected vibration of photovoltaic power station system, is characterized in that, described vibration suppression device adopts inductance, or the string of inductance and electric capacity the reactance network formed.
3. the method suppressing the grid-connected vibration of photovoltaic power station system as claimed in claim 1, is characterized in that, in large-scale ground electric power station system, and described vibration suppression device of connecting between centralized inverter with grid-connected transformer.
4. the method suppressing the grid-connected vibration of photovoltaic power station system as claimed in claim 1, is characterized in that, in the distributed power station system that band transformer is grid-connected, and described vibration suppression device that the AC bus of each interchange header box is connected.
5. the method suppressing the grid-connected vibration of photovoltaic power station system as claimed in claim 1, is characterized in that, in the distributed power station system that band transformer is grid-connected, and described vibration suppression device of connecting in the former limit or secondary of total grid-connected transformer.
6. the method suppressing the grid-connected vibration of photovoltaic power station system as claimed in claim 1, is characterized in that, in not grid-connected with transformer distributed power station system, and described vibration suppression device that the AC bus of each interchange header box is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510231125.XA CN104821597A (en) | 2015-05-08 | 2015-05-08 | Method for suppressing grid connection oscillation of photovoltaic power station system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510231125.XA CN104821597A (en) | 2015-05-08 | 2015-05-08 | Method for suppressing grid connection oscillation of photovoltaic power station system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104821597A true CN104821597A (en) | 2015-08-05 |
Family
ID=53731809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510231125.XA Pending CN104821597A (en) | 2015-05-08 | 2015-05-08 | Method for suppressing grid connection oscillation of photovoltaic power station system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104821597A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655251A (en) * | 2016-10-31 | 2017-05-10 | 国家电网公司 | Photovoltaic power station grid-connection point inverter resonance probability index prediction method |
| CN112350301A (en) * | 2019-08-06 | 2021-02-09 | 上海西门子医疗器械有限公司 | Power output circuit, equipment and method for preventing phase-breaking overvoltage |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516027A (en) * | 2013-10-15 | 2014-01-15 | 国家电网公司 | Method and system suppressing resonance of direct current power supply system |
| CN103595089A (en) * | 2013-10-15 | 2014-02-19 | 国家电网公司 | Method and system for restraining resonance of electric vehicle circuit |
| CN103715717A (en) * | 2013-12-31 | 2014-04-09 | 华北电力大学（保定） | Method for controlling three-phase photovoltaic grid-connected inverter when power grid voltage is unbalanced |
| CN103929052A (en) * | 2014-04-30 | 2014-07-16 | 阳光电源股份有限公司 | Output filter of grid-connected inverter |
| CN104201720A (en) * | 2014-09-12 | 2014-12-10 | 阳光电源股份有限公司 | Control method and control device for suppression of resonance of grid-connected power generation system |
| CN204230896U (en) * | 2014-10-17 | 2015-03-25 | 国网青海省电力公司经济技术研究院 | A kind of for suppressing the grid-connected additional controller devices of sub-synchronous oscillation |
-
2015
- 2015-05-08 CN CN201510231125.XA patent/CN104821597A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516027A (en) * | 2013-10-15 | 2014-01-15 | 国家电网公司 | Method and system suppressing resonance of direct current power supply system |
| CN103595089A (en) * | 2013-10-15 | 2014-02-19 | 国家电网公司 | Method and system for restraining resonance of electric vehicle circuit |
| CN103715717A (en) * | 2013-12-31 | 2014-04-09 | 华北电力大学（保定） | Method for controlling three-phase photovoltaic grid-connected inverter when power grid voltage is unbalanced |
| CN103929052A (en) * | 2014-04-30 | 2014-07-16 | 阳光电源股份有限公司 | Output filter of grid-connected inverter |
| CN104201720A (en) * | 2014-09-12 | 2014-12-10 | 阳光电源股份有限公司 | Control method and control device for suppression of resonance of grid-connected power generation system |
| CN204230896U (en) * | 2014-10-17 | 2015-03-25 | 国网青海省电力公司经济技术研究院 | A kind of for suppressing the grid-connected additional controller devices of sub-synchronous oscillation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655251A (en) * | 2016-10-31 | 2017-05-10 | 国家电网公司 | Photovoltaic power station grid-connection point inverter resonance probability index prediction method |
| CN112350301A (en) * | 2019-08-06 | 2021-02-09 | 上海西门子医疗器械有限公司 | Power output circuit, equipment and method for preventing phase-breaking overvoltage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105743113B (en) | A kind of determination method of Multi-infeed HVDC transmission system harmonic instability | |
| Kadir et al. | Harmonic impact of different distributed generation units on low voltage distribution system | |
| CN103746404B (en) | A kind of honourable fiery bundling direct current delivery system method for estimating stability | |
| CN106130038A (en) | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage | |
| CN103904681B (en) | High-power centralized parallel network power generation coordinated control system and method | |
| Xu et al. | Study on black start strategy of microgrid with PV and multiple energy storage systems | |
| CN105183999B (en) | Electric system maximum short circuit current computational methods containing photovoltaic plant | |
| CN103825486A (en) | Photovoltaic inverter control method under condition of asymmetrical voltage sag | |
| CN104037792B (en) | The control method of honourable power fluctuation is stabilized in a kind of water power and energy storage | |
| Bayhan et al. | Power electronic converters and control techniques in AC microgrids | |
| CN107046287A (en) | A kind of large-sized photovoltaic power station harmonic wave Over-voltage Analysis method | |
| CN204119150U (en) | A kind of photovoltaic generating system of high-efficiency and low-cost | |
| CN203589824U (en) | Renewable energy power generation, power transmission and transformation and power grid access integration system | |
| CN104821597A (en) | Method for suppressing grid connection oscillation of photovoltaic power station system | |
| CN104377729A (en) | Reverse power protection method applicable to self-generation self-use grid-connection mode distributed photovoltaic power station | |
| CN106849154B (en) | Photovoltaic power station node harmonic voltage and harmonic source sensitivity relation analysis method | |
| CN104242706A (en) | MW-level photovoltaic inverter system topological structure | |
| CN202633962U (en) | Photovoltaic grid connected and electric energy quality comprehensive control apparatus based on TMS320F2812 | |
| CN202524301U (en) | Grid-connected inverter of wind-driven generator | |
| CN201946990U (en) | Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter | |
| CN205753439U (en) | A kind of many level photovoltaic inverter without alterating and direct current flow sensor | |
| Li et al. | The realization of flexible photovoltaic power grid-connection μ-synthesis robust control in microgrid | |
| CN203747433U (en) | Wind power generation system | |
| CN108152619B (en) | Power grid fault simulation device and control method thereof | |
| Elgammal | Optimal Design of PID Controller for Doubly-Fed Induction Generator-Based Wave Energy Conversion System Using Multi Objective Particle Swarm Optimization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu city in Wuxi Province Economic Development Zone Huishan Wind Power Technology Industrial Park to create a road No. 1 room 3001 Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. |
|
| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150805 |