CN104377729A - Reverse power protection method applicable to self-generation self-use grid-connection mode distributed photovoltaic power station - Google Patents
Reverse power protection method applicable to self-generation self-use grid-connection mode distributed photovoltaic power station Download PDFInfo
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- CN104377729A CN104377729A CN201410667182.8A CN201410667182A CN104377729A CN 104377729 A CN104377729 A CN 104377729A CN 201410667182 A CN201410667182 A CN 201410667182A CN 104377729 A CN104377729 A CN 104377729A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010248 power generation Methods 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 abstract description 13
- 238000009826 distribution Methods 0.000 abstract description 9
- 238000011160 research Methods 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000005457 optimization Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 208000033748 Device issues Diseases 0.000 description 1
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Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/003—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to reversal of power transmission direction
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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 a reverse power protection method applicable to a self-generation self-use grid-connection mode distributed photovoltaic power station. The reverse power protection method comprises the following steps that the value and direction of real-time power of grid-connection points of common coupling are monitored, the monitored real-time power magnitude is compared with the rated power of the photovoltaic power station, and if the reverse power exceeds the set value of the rated output power of the photovoltaic power station, the output power of inverters is reduced step by step and timekeeping is conducted; if the time exceeds the time threshold, grid-connection disconnectors of all slave photovoltaic power stations are removed step by step. The reverse power protection method reduces the impact on a power distribution network, prolongs the service time of photovoltaic power generation and reduces the power utilization cost of users, a power regulating system is scientific and reasonable, and therefore the requirements of scientific research and engineering application in the fields relevant to the self-generation self-use grid-connection mode distributed photovoltaic power generation can be met.
Description
Technical field
The invention belongs to photovoltaic generation control field, relate to a kind of reverse power protection method being suitable for grid-connect mode distributed photovoltaic power station of generating power for their own use.
Background technology
According to the development plan of country to distributed power source, the coming years, the distributed power source installed capacity of China can present large-scale growth.Generate power for their own use as a kind of grid-connect mode in distributed photovoltaic power station; generally be applied to that user side power load is comparatively large and power load continues, seldom have in 1 year stop production or half stops production when; this type systematic; if user power utilization cannot be dissolved; upper level electrical network can be delivered to by transformer is counter; and distribution transformer design is not allowed for anti-power transmission (to fall power transmission in short-term; when such as debugging; and do not allow for a long time); its initial direction of tide design is fixing, so need to take counterflow-preventing safeguard measure to send to avoid the counter of electric power.
At present; generate power for their own use grid-connect mode distributed photovoltaic power station in the urgent need to propose a kind of can according to the reverse power protection optimization system falling to send into power distribution network watt level and precise downregulation photovoltaic plant power output, thus the grid-connect mode distributed photovoltaic power station owner that realizes generating power for their own use under the prerequisite ensureing power grid security reliability is benefited and maximizes.
Summary of the invention
The object of this invention is to provide a kind of reverse power protection method of the grid-connect mode distributed photovoltaic power station that is applicable to generate power for their own use; in order to solve the impact reducing inverse probability supervising device frequent deciliter grid-connected circuit breaker and cause electrical network; improve electric power system security reliability, reduce user power utilization cost.
For achieving the above object, the solution of the present invention comprises:
Be suitable for the reverse power protection method in grid-connect mode distributed photovoltaic power station of generating power for their own use, step is as follows:
1) monitor value and the direction of the realtime power of grid-connected points of common connection, the realtime power value recorded and photovoltaic plant rated power compared,
2) if reverse power exceedes the set point of photovoltaic plant rated output power, then inverter output power is lowered step by step and timing;
3) if time overtime limit value, then the grid-connected circuit breaker of each sub-photo-voltaic power generation station is excised step by step.
After excising each sub-photo-voltaic power generation station step by step, through certain hour, again compare realtime power and the photovoltaic plant rated power of points of common connection, when within described set point, step by step by grid-connected for each sub-photo-voltaic power generation station.
Described set point is 5%.
Described time limit value is 2s.
The present invention is under the prerequisite ensureing power supply quality and reliability, by increasing power regulating system to traditional inverse probability supervising device, avoid Frequent trip and the reclosing of grid-connect mode distributed photovoltaic electric station grid connection circuit breaker of generating power for their own use, decrease the impact to power distribution network, add the service time of photovoltaic generation simultaneously, decrease user power utilization cost, power regulating system is scientific and reasonable, can meet the generate power for their own use scientific research of grid-connect mode distributed photovoltaic power generation association area and the demand of engineer applied.
Accompanying drawing explanation
Fig. 1 is a kind of photovoltaic parallel in system;
Fig. 2 is the flow chart of a kind of execution mode of guard method of the present invention;
Fig. 3 is excision photovoltaic plant control logic;
Fig. 4 recovers photovoltaic generating system cutting-in control logic.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
The reverse power protection optimization system in a kind of grid-connect mode distributed photovoltaic power station that is applicable to generate power for their own use of the present invention as shown in Figure 1, be made up of inverse probability supervising device and power regulating system, emergent power adverse current can first utilize power regulating system to lower photovoltaic generating system inverter output power when falling to send into public electric wire net, if grid-connected requirement recycling inverse probability supervising device cut-out photovoltaic generating system cannot be met to generate electricity by way of merging two or more grid systems, after inverse probability phenomenon disappears, utilize inverse probability supervising device to realize photovoltaic generating system to generate electricity by way of merging two or more grid systems, automatic adjustment photovoltaic system electricity generation power, balance is reached with load consuming power, control photovoltaic power generation system output power and meet grid-connected requirement.
Be the reverse power protection optimization system flow chart in a kind of grid-connect mode distributed photovoltaic power station that is applicable to generate power for their own use of the present invention as shown in Figure 2, when the downward photovoltaic plant power output when power being mainly used in realizing input power distribution network is more than 5% and the power of input distribution meet grid-connected requirement, recover photovoltaic electric station grid connection two kinds of objects.
Inverse probability supervising device: for monitoring the realtime power of the points of common connection (measurement point) of garden and common line, and be uploaded to power regulating system by the realtime power value P recorded and to the divide-shut brake instruction that photovoltaic electric station grid connection circuit breaker sends.Power direction public electric wire net being flowed to garden is set to positive direction, when measurement point occur garden to public electric wire net outbound course power (i.e. inverse probability) and the value of inverse probability exceed photovoltaic plant rated power 5% and power regulating system in 2s, inverse probability value cannot be lowered to 5% of photovoltaic plant rated power time, send and jump the instruction of photovoltaic electric station grid connection circuit breaker, the grid-connected circuit breaker of each sub-photovoltaic plant of tripping is until inverse probability value meets grid-connected requirement (namely inverse probability value is less than 5% of photovoltaic plant rated power) step by step; Photovoltaic plant is after net 600s, and inverse probability supervising device continues to measure measurement point realtime power, if meet grid-connected requirement, closes each sub-photovoltaic electric station grid connection circuit breaker step by step, realizes photovoltaic electric station grid connection.
Power regulating system: frequently send for avoiding inverse probability supervising device to jump and close the instruction of photovoltaic electric station grid connection circuit breaker, reduce the impact that photovoltaic plant causes power distribution network because of frequent reclosing.When measurement point inverse probability value is greater than 5% of photovoltaic plant rated power, power regulating system starts rapidly, lowers the power output of each inverter of photovoltaic plant step by step, amplitude of accommodation Δ P=||P|-|0.04P
e||, photovoltaic plant is run with the power output of P-Δ P; When photovoltaic plant is by after grid-connected from network recovery, power regulating system starts rapidly, raises the power output of each inverter of photovoltaic plant, promotes photovoltaic power generation quantity as early as possible.
(1) photovoltaic plant power output is lowered
Adopt the closed loop control mode of hardware controls after first software adjustment, namely when the reverse power injecting power distribution network exceedes photovoltaic plant rated output power P
e5% time, first utilize photovoltaic generation power regulating system to lower the power output of photovoltaic DC-to-AC converter, if the reverse power injecting electrical network in 2s is lower than photovoltaic plant rated output power P
e5%, then do not need inverse probability supervising device executable operations; Otherwise according to Fig. 3 reverse power protection optimization system excision photovoltaic plant control logic, inverse probability supervising device issues trip command to the grid-connected circuit breaker of each sub-photovoltaic plant, excises each sub-photovoltaic plant step by step, until meet grid-connected requirement.
(2) photovoltaic electric station grid connection is recovered
Timing is started while each sub-photovoltaic plant of inverse probability supervising device excision, photovoltaic generating system cutting-in control logic is recovered according to Fig. 4 reverse power protection optimization system, after 600s, inverse probability supervising device continues the realtime power measuring points of common connection, when the reverse power injecting power distribution network is less than 5% of photovoltaic plant rated power, inverse probability supervising device sends reclosing command to the grid-connected circuit breaker of each sub-photo-voltaic power generation station, step by step by grid-connected for each sub-photo-voltaic power generation station, power regulating system raises inverter generated output, complete a reverse power protection, when photovoltaic plant is by after grid-connected from network recovery, power regulating system starts rapidly, raise the power output of each inverter of photovoltaic plant, promote photovoltaic power generation quantity as early as possible.
(3) circulation performs above-mentioned flow process.
Be presented above concrete execution mode, but the present invention is not limited to described execution mode.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out execution mode without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (4)
1. be suitable for the reverse power protection method in grid-connect mode distributed photovoltaic power station of generating power for their own use, it is characterized in that, step is as follows:
1) monitor value and the direction of the realtime power of grid-connected points of common connection, the realtime power value recorded and photovoltaic plant rated power compared,
2) if reverse power exceedes the set point of photovoltaic plant rated output power, then inverter output power is lowered step by step and timing;
3) if time overtime limit value, then the grid-connected circuit breaker of each sub-photo-voltaic power generation station is excised step by step.
2. a kind of reverse power protection method being suitable for grid-connect mode distributed photovoltaic power station of generating power for their own use according to claim 1; it is characterized in that; after excising each sub-photo-voltaic power generation station step by step; through certain hour; again compare realtime power and the photovoltaic plant rated power of points of common connection; when within described set point, step by step by grid-connected for each sub-photo-voltaic power generation station.
3. a kind of reverse power protection method being suitable for grid-connect mode distributed photovoltaic power station of generating power for their own use according to claim 1, it is characterized in that, described set point is 5%.
4. a kind of reverse power protection method being suitable for grid-connect mode distributed photovoltaic power station of generating power for their own use according to claim 1, it is characterized in that, described time limit value is 2s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667182.8A CN104377729B (en) | 2014-11-20 | 2014-11-20 | It is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410667182.8A CN104377729B (en) | 2014-11-20 | 2014-11-20 | It is applicable in the reverse-power protection method for grid-connect mode photovoltaic power station of generating power for their own use |
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| CN104377729A true CN104377729A (en) | 2015-02-25 |
| CN104377729B CN104377729B (en) | 2018-06-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099858B (en) * | 2016-05-23 | 2018-06-29 | 国电南瑞科技股份有限公司 | A kind of method for improving reverse-power in the generator protection precision |
| CN108919106A (en) * | 2018-05-30 | 2018-11-30 | 厦门科华恒盛股份有限公司 | A kind of fault detection means and method of the static switch for UPS |
| CN109339941A (en) * | 2018-10-19 | 2019-02-15 | 国网上海市电力公司 | A kind of distributing-supplying-energy system of energy-saving and emission-reduction |
| CN113241789A (en) * | 2021-04-16 | 2021-08-10 | 江苏固德威电源科技股份有限公司 | High-voltage grid-connected anti-reflux method and system for photovoltaic power station |
| CN113300406A (en) * | 2021-06-28 | 2021-08-24 | 上海电机学院 | Unidirectional distributed grid-connected photovoltaic power generation system and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368203A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Photovoltaic reverse-power closed loop control system and method |
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2014
- 2014-11-20 CN CN201410667182.8A patent/CN104377729B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368203A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Photovoltaic reverse-power closed loop control system and method |
Non-Patent Citations (2)
| Title |
|---|
| 郑雪驹: "光伏电站无逆流并网接入系统设计与控制策略", 《中国科技纵横》 * |
| 黄海: "光伏电站中的逆功率保护功能", 《机械制造与自动化》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099858B (en) * | 2016-05-23 | 2018-06-29 | 国电南瑞科技股份有限公司 | A kind of method for improving reverse-power in the generator protection precision |
| CN108919106A (en) * | 2018-05-30 | 2018-11-30 | 厦门科华恒盛股份有限公司 | A kind of fault detection means and method of the static switch for UPS |
| CN109339941A (en) * | 2018-10-19 | 2019-02-15 | 国网上海市电力公司 | A kind of distributing-supplying-energy system of energy-saving and emission-reduction |
| CN113241789A (en) * | 2021-04-16 | 2021-08-10 | 江苏固德威电源科技股份有限公司 | High-voltage grid-connected anti-reflux method and system for photovoltaic power station |
| CN113300406A (en) * | 2021-06-28 | 2021-08-24 | 上海电机学院 | Unidirectional distributed grid-connected photovoltaic power generation system and control method thereof |
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| CN104377729B (en) | 2018-06-26 |
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