CN104579120A - Control method during photovoltaic power generation off-grid operation - Google Patents
Control method during photovoltaic power generation off-grid operation Download PDFInfo
- Publication number
- CN104579120A CN104579120A CN201510000360.6A CN201510000360A CN104579120A CN 104579120 A CN104579120 A CN 104579120A CN 201510000360 A CN201510000360 A CN 201510000360A CN 104579120 A CN104579120 A CN 104579120A
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- photovoltaic
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- interface converter
- mppt
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010248 power generation Methods 0.000 title abstract 5
- 238000004146 energy storage Methods 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
-
- 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
Abstract
Provided is a control method during photovoltaic power generation off-grid operation. Through control over a photovoltaic interface converter, switching between an MPPT working state, a constant voltage output working state and a standby state can be achieved according to needs. During photovoltaic power generation system off-grid operation, when photovoltaic power generation power is smaller than power needed by a load, a photovoltaic interface inverter is switched to be in the MPPT working state, if power is still unbalanced, by storage battery energy saving converter discharging, direct-current bus voltage constancy is controlled, when photovoltaic power generation power is larger than power needed by the load, a direct-current bus charges a battery through DC/DC, if battery SOC exceeds 95%, charging is stopped, and by switching of the working state of the photovoltaic interface converter, a power balance point is subjected to searching. If load power is zero, the photovoltaic interface converter works at the MPPT state, DC/DC is started to charge the battery, after the battery is in a floating-charge state, only one photovoltaic interface converter needs to work at a constant-voltage-output state, direct-current bus voltage is stabilized, and other photovoltaic converters are in the standby state.
Description
Technical field
The present invention relates to a kind of photovoltaic generation from control method during network operation, belong to solar energy generation technology field.
Background technology
Along with a large amount of uses of traditional energy, coal, oil, natural gas equal energy source slowly will can move towards exhausted, and in order to tackle climate change and environmental pollution, development new forms of energy become inexorable trend, and solar energy is one of representational new forms of energy of current most.Bulk power grid is powered to remote districts difficulty, usually forms a set of independently micro-grid system in this locality, for the load of this locality provides electric energy.For independently photovoltaic generation from network operation system, generally be made up of many photovoltaic module connection in series-parallel, photovoltaic interface converter, energy-storage system, by controlling each photovoltaic interface converter (DC/AC) and energy storage inverter (DC/DC) separately, energy-storage system is made to meet local burden requirement at cooperation photovoltaic generation.Photovoltaic generating system generated output, with illumination, variations in temperature, in order to mate the power needed for power and local load that photovoltaic generation sends, proposes a kind of photovoltaic generation from control method during network operation.The method can realize the efficiency utilization of energy, and improves the reliability of photovoltaic generating system from network operation.
Summary of the invention
The object of the invention is, utilizing from the reliable realization energy efficient of network operation to improve photovoltaic generating system, proposing a kind of photovoltaic generation from control method during network operation.
Realizing technical scheme of the present invention is, a kind of photovoltaic generation is from control method during network operation, described method is by the control to photovoltaic interface converter, make photovoltaic interface converter in MPPT(MPPT maximum power point tracking) operating state, constant voltage output services state, to switch between holding state, and then realize photovoltaic generating system and be greater than between load power demand two kinds of mode of operations switch from load power demand and photovoltaic generation power can be less than in photovoltaic generation power during network operation, make energy obtain efficiency utilization.
Described photovoltaic interface converter control structure comprises photovoltaic cell, Boost circuit, DC bus and control section, and control section comprises MPPT and controls and constant voltage output control; Photovoltaic cell connects DC bus by Boost circuit;
When described MPPT controls, gather photovoltaic output voltage, electric current, after MPPT calculates, obtain reference value, export after PI by comparing the difference obtained with actual value be
;
When described constant voltage exports and controls, by gathering DC bus-bar voltage, be multiplied by a DC bus-bar voltage feedback factor
afterwards with from reference DC bus-bar voltage during network operation
relatively, the output after PI is
;
Get
,
in less and triangle wave, produce pwm signal and drive IGBT, thus achieve the real-time switching of the operating state of photovoltaic converter.
When described photovoltaic generation power is less than load power demand mode of operation, photovoltaic interface converter is with MPPT operation, and storage battery is discharged by energy storage interface converter simultaneously, and controls DC bus voltage, makes it remain steady state value.
When described photovoltaic generation power is greater than load power demand mode of operation, first DC bus is charged to battery by DC/DC, if battery SOC is more than 95%, then stops charging, now busbar voltage starts to raise, and finds power-balance point by the operating state switching photovoltaic converter;
If bearing power is zero, photovoltaic photovoltaic interface converter is with MPPT operation, start DC/DC to charge to battery, after treating that battery is in floating charge state, a photovoltaic interface converter is only needed to be operated in constant voltage output state, stable DC bus voltage, all the other photovoltaic converters are in holding state.
The invention has the beneficial effects as follows, the method to the conversion of mode of operation by photovoltaic interface converter, can be realized the efficiency utilization of energy, and improve the reliability of photovoltaic generating system from network operation.
The present invention is applicable to photovoltaic generation from control during network operation.
Accompanying drawing explanation
Fig. 1 is that photovoltaic off-grid runs electricity generation system figure;
Fig. 2 photovoltaic interface converter control block diagram.
Embodiment
The specific embodiment of the present invention as depicted in figs. 1 and 2
When photovoltaic generation is from network operation, owing to affecting by the extraneous factor such as illumination, temperature, the power real-time change that photovoltaic DC-to-AC converter exports, by power match situation, can be divided into generated output to be greater than load power demand and (call mode of operation in the following text
) and generated output be less than load power demand and (call mode of operation in the following text
) two kinds of situations, in order to enable measuring utilizes and meet photovoltaic off-grid reliability of operation efficiently, a kind of photovoltaic generation proposed can according to the change of photovoltaic generation power from control method during network operation, by controlling each photovoltaic interface converter (DC/AC) and energy storage inverter (DC/DC) separately, it is made to be operated in different mode of operations.
The following describes the concrete grammar that photovoltaic interface converter is controlled:
When photovoltaic generating system is from network operation, when photovoltaic generation power is greater than local load power demand, DC bus is charged a battery by energy storage interface converter.When battery energy storage system is in saturation condition, DC bus voltage rises, photovoltaic interface converter constant voltage output controller
can exit at first, maintenance DC bus voltage is simultaneously
, photovoltaic interface converter is operated in constant voltage output state.When PV generated output continues to increase, and local load power demand is constant, then DC bus voltage rises further, and photovoltaic interface converter will be according to
value order from large to small, switch to holding state by constant voltage output services state successively and then reduce photovoltaic generation power, until only have a photovoltaic interface converter to be operated in constant voltage output state, control DC bus voltage is stablized, make photovoltaic power output equal load power demand, 2. photovoltaic off-grid electricity generation system is switched to mode of operation simultaneously.Therefore, when system be in operational mode 2. time, photovoltaic interface converter can basis
the difference of value, make only have a photovoltaic interface converter to be operated in and export constant voltage mode and control DC bus voltage, all the other are in MPPT or holding state.
When photovoltaic generation power is less than local load power demand, photovoltaic interface converter can foundation
value order from small to large switches to MPPT state by holding state gradually, increases photovoltaic generation power, makes photovoltaic power output equal load power demand.If all photovoltaic interface converter all work with MPPT, and photovoltaic generation power is still less than local load power demand, DC bus voltage continues to decline, and storage battery is discharged by energy storage interface converter and controls DC bus voltage, and 1. 2. system switch to mode of operation by mode of operation.
Claims (4)
1. a photovoltaic generation is from control method during network operation, it is characterized in that, described method is by the control to photovoltaic interface converter, photovoltaic interface converter is switched between MPPT operating state, constant voltage output services state, holding state, and then realize photovoltaic generating system and be greater than between load power demand two kinds of mode of operations switch from load power demand and photovoltaic generation power can be less than in photovoltaic generation power during network operation, make energy obtain efficiency utilization.
2. a kind of photovoltaic generation according to claim 1 is from control method during network operation, it is characterized in that, described photovoltaic interface converter control structure comprises photovoltaic cell, Boost circuit, DC bus and control section, and control section comprises MPPT and controls and constant voltage output control; Photovoltaic cell connects DC bus by Boost circuit;
When described MPPT controls, gather photovoltaic output voltage, electric current, after MPPT calculates, obtain reference value, export after PI by comparing the difference obtained with actual value be
;
When described constant voltage exports and controls, by gathering DC bus-bar voltage, be multiplied by a DC bus-bar voltage feedback factor
afterwards with from reference DC bus-bar voltage during network operation
relatively, the output after PI is
;
Get
,
in less and triangle wave, produce pwm signal and drive IGBT, thus achieve the real-time switching of the operating state of photovoltaic converter.
3. a kind of photovoltaic generation according to claim 1 is from control method during network operation, it is characterized in that, when described photovoltaic generation power is less than load power demand mode of operation, photovoltaic interface converter is with MPPT operation, storage battery is discharged by energy storage interface converter simultaneously, and control DC bus voltage, make it remain steady state value.
4. a kind of photovoltaic generation according to claim 1 is from control method during network operation, it is characterized in that, when described photovoltaic generation power is greater than load power demand mode of operation, first DC bus is charged to battery by DC/DC, if battery SOC is more than 95%, then stop charging, now busbar voltage starts to raise, and finds power-balance point by the operating state switching photovoltaic converter;
If bearing power is zero, photovoltaic photovoltaic interface converter is with MPPT operation, start DC/DC to charge to battery, after treating that battery is in floating charge state, a photovoltaic interface converter is only needed to be operated in constant voltage output state, stable DC bus voltage, all the other photovoltaic converters are in holding state.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868840A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter off-grid MPPT perturbation method |
| CN105552954A (en) * | 2015-12-17 | 2016-05-04 | 合肥日源电气信息技术有限公司 | Cascading photovoltaic inverter and grid-connection control method and controller for cascading photovoltaic inverter |
| CN106505600A (en) * | 2016-10-18 | 2017-03-15 | 江苏兆伏新能源有限公司 | A kind of energy management method of photovoltaic energy storage inversion system |
| CN108599136A (en) * | 2018-06-14 | 2018-09-28 | 浙江国际海运职业技术学院 | A kind of mode switching method of direct-current grid photovoltaic system |
| CN109560539A (en) * | 2018-10-26 | 2019-04-02 | 珠海瓦特电力设备有限公司 | A kind of method, circuit and the device of photovoltaic direct-furnish DC power system power distribution |
| CN109599934A (en) * | 2018-12-27 | 2019-04-09 | 哈尔滨工业大学（深圳） | Multiport power cell expandable type photovoltaic charger |
| CN109634349A (en) * | 2018-12-18 | 2019-04-16 | 珠海格力电器股份有限公司 | Power optimization method and its device, photovoltaic apparatus and photovoltaic system |
| CN110071497A (en) * | 2019-05-14 | 2019-07-30 | 电子科技大学 | A kind of photovoltaic DC electricity generation system and its control method with energy storage device |
| CN110719028A (en) * | 2018-07-13 | 2020-01-21 | 台达电子工业股份有限公司 | Compensation control system and method |
| CN110854920A (en) * | 2019-12-14 | 2020-02-28 | 大连海事大学 | Photovoltaic power generation parallel controller device |
| CN112366676A (en) * | 2020-09-15 | 2021-02-12 | 国网江苏省电力有限公司电力科学研究院 | Photovoltaic direct current direct-fed power generation method and device based on controllable power supply |
| CN113852061A (en) * | 2021-08-13 | 2021-12-28 | 国网江苏省电力有限公司盐城供电分公司 | Photovoltaic power generation-containing DC micro-grid work control method |
| CN114243872A (en) * | 2021-11-08 | 2022-03-25 | 深圳供电局有限公司 | Fill electric pile DC power supply unit and battery charging outfit |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868840B (en) * | 2015-05-12 | 2016-08-24 | 江苏固德威电源科技股份有限公司 | Photovoltaic energy storage inverter off-network MPPT perturbation motion method |
| CN104868840A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter off-grid MPPT perturbation method |
| CN105552954B (en) * | 2015-12-17 | 2018-04-10 | 合肥日源电气信息技术有限公司 | A kind of cascade connection type photovoltaic DC-to-AC converter and its grid-connected control method and controller |
| CN105552954A (en) * | 2015-12-17 | 2016-05-04 | 合肥日源电气信息技术有限公司 | Cascading photovoltaic inverter and grid-connection control method and controller for cascading photovoltaic inverter |
| CN106505600B (en) * | 2016-10-18 | 2019-05-03 | 爱士惟新能源技术(扬中)有限公司 | A kind of energy management method of photovoltaic energy storage inversion system |
| CN106505600A (en) * | 2016-10-18 | 2017-03-15 | 江苏兆伏新能源有限公司 | A kind of energy management method of photovoltaic energy storage inversion system |
| CN108599136A (en) * | 2018-06-14 | 2018-09-28 | 浙江国际海运职业技术学院 | A kind of mode switching method of direct-current grid photovoltaic system |
| US11139669B2 (en) | 2018-07-13 | 2021-10-05 | Delta Electronics, Inc. | Converter system and method |
| CN110719028B (en) * | 2018-07-13 | 2021-03-19 | 台达电子工业股份有限公司 | Compensation control system and method |
| CN110719028A (en) * | 2018-07-13 | 2020-01-21 | 台达电子工业股份有限公司 | Compensation control system and method |
| CN109560539B (en) * | 2018-10-26 | 2023-09-29 | 珠海瓦特电力设备有限公司 | Method, circuit and device for distributing power of photovoltaic direct-current power supply system |
| CN109560539A (en) * | 2018-10-26 | 2019-04-02 | 珠海瓦特电力设备有限公司 | A kind of method, circuit and the device of photovoltaic direct-furnish DC power system power distribution |
| CN109634349A (en) * | 2018-12-18 | 2019-04-16 | 珠海格力电器股份有限公司 | Power optimization method and its device, photovoltaic apparatus and photovoltaic system |
| WO2020124973A1 (en) * | 2018-12-18 | 2020-06-25 | 珠海格力电器股份有限公司 | Power optimization method and apparatus therefor, and photovoltaic device and photovoltaic system |
| CN109634349B (en) * | 2018-12-18 | 2020-06-30 | 珠海格力电器股份有限公司 | Power optimization method and device, photovoltaic equipment and photovoltaic system |
| US11710969B2 (en) | 2018-12-18 | 2023-07-25 | Gree Electric Appliances, Inc. Of Zhuhai | Power optimization method and apparatus therefor, and photovoltaic device and photovoltaic system |
| CN109599934A (en) * | 2018-12-27 | 2019-04-09 | 哈尔滨工业大学（深圳） | Multiport power cell expandable type photovoltaic charger |
| CN110071497A (en) * | 2019-05-14 | 2019-07-30 | 电子科技大学 | A kind of photovoltaic DC electricity generation system and its control method with energy storage device |
| CN110854920A (en) * | 2019-12-14 | 2020-02-28 | 大连海事大学 | Photovoltaic power generation parallel controller device |
| CN110854920B (en) * | 2019-12-14 | 2023-07-04 | 大连海事大学 | Parallel controller device for photovoltaic power generation |
| CN112366676B (en) * | 2020-09-15 | 2022-10-21 | 国网江苏省电力有限公司电力科学研究院 | Photovoltaic direct current direct-fed power generation method and device based on controllable power supply |
| CN112366676A (en) * | 2020-09-15 | 2021-02-12 | 国网江苏省电力有限公司电力科学研究院 | Photovoltaic direct current direct-fed power generation method and device based on controllable power supply |
| CN113852061A (en) * | 2021-08-13 | 2021-12-28 | 国网江苏省电力有限公司盐城供电分公司 | Photovoltaic power generation-containing DC micro-grid work control method |
| CN114243872A (en) * | 2021-11-08 | 2022-03-25 | 深圳供电局有限公司 | Fill electric pile DC power supply unit and battery charging outfit |
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Application publication date: 20150429 |