WO2014054987A1 - Server for controlling photovoltaic power generation system - Google Patents

Server for controlling photovoltaic power generation system Download PDF

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Publication number
WO2014054987A1
WO2014054987A1 PCT/SE2012/051056 SE2012051056W WO2014054987A1 WO 2014054987 A1 WO2014054987 A1 WO 2014054987A1 SE 2012051056 W SE2012051056 W SE 2012051056W WO 2014054987 A1 WO2014054987 A1 WO 2014054987A1
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WO
WIPO (PCT)
Prior art keywords
power generation
photovoltaic panel
photovoltaic
amount
information
Prior art date
Application number
PCT/SE2012/051056
Other languages
French (fr)
Inventor
Johan Hjelm
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2012/051056 priority Critical patent/WO2014054987A1/en
Publication of WO2014054987A1 publication Critical patent/WO2014054987A1/en

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Classifications

    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Aserver for controlling a photovoltaic power generation system including a plurality of photovoltaic panels is provided. The server includes a database unit configured to store performance information indicating power generation performance of each photovoltaic panel; a receive unit configured to receive weather information and demand information from one or more servers; and a determination unit configured to determine a required power amount from the demand information and a power generation amount of each photovoltaic panel to generate the required power amount by the photovoltaic power generation system based on the weather information and the performance information.

Description

SERVER FOR CONTROLLING PHOTOVOLTAIC POWER GENERATION
SYSTEM
TECHNICAL FIELD
[0001] The present invention relates to a control of a photovoltaic power generation system.
BACKGROUND
[0002] An electric power generation system that generates electric power from natural energy such as solar light has been widely deployed as disclosed in US2011/0172835A1. According to US2011/0172835A1, the electricity being transmitted from a power generation site to a transmission line is reduced based on pricing data and curtailment probability data. Further,
US2011/0307101A1 discloses an energy management server, which controls energy consumption, based on information from an energy generation site.
[0003] Solar light is still considered to be a secondary energy source for power generation, and the most work has been done for increasing power generation. If the solar light is used as the primary energy source, the electric power generation system using solar energy must have a power generation capacity equal to a
required power amount by consumers regardless of the weather condition. Thus, the photovoltaic power
generation system using solar energy needs to have enough photovoltaic cells to generate required power even in the cloudy condition. This means, in sunny conditions, the photovoltaic power generation system must generate power more than required.
[0004] An imbalance between a power generation amount and a power demand amount may cause a problem in the power generation and distribution systems.
SUMMARY
[0005] The present invention provides a control server and control method for controlling a
photovoltaic power generation system to balance the power generation amount and the power demand amount.
[0006] In accordance with a first aspect of the present invention, a server for controlling a
photovoltaic power generation system including a plurality of photovoltaic panels is provided. The server includes a database unit configured to store performance information indicating power generation performance of each photovoltaic panel; a receive unit configured to receive weather information and demand information from one or more servers; and a
determination unit configured to determine a required power amount from the demand information and a power generation amount of each photovoltaic panel to generate the required power amount by the photovoltaic power generation system based on the weather information and the performance information.
[0007] The receive unit may be further configured to receive status information including a current power generation amount and a direction of each photovoltaic panel from the photovoltaic power generation system, and the determination unit may be further configured to use the status information to determine the power generation amount of each photovoltaic panel.
[0008] The database unit may be further configured to store use period information of each photovoltaic panel, and the determination unit may be further configured to use the use period information to
determine the power generation amount of each
photovoltaic panel.
[0009] The database unit may be further configured to store policy information providing criteria to select one combination of power generation amount of each photovoltaic panel if a plurality of combinations of power generation amount of each photovoltaic panel are available to generate the required power amount by the photovoltaic power generation system, and the determination unit may be further configured to use the policy information to determine the power generation amount of each photovoltaic panel.
[0010] A direction of a photovoltaic panel may be adjusted by a motor, and the policy information may include a total amount of rotation of each motor, and the determination unit may be further configured to use the total amount of rotation of each motor to determine the power generation amount of each photovoltaic panel.
[0011] The server may include a control unit configured to send a control message to the
photovoltaic power generation system. The control message may indicate an absolute value of the power generation amount for each photovoltaic panel. Further, the control message may indicate a change amount of the power generation amount for each photovoltaic panel.
[0012] In accordance with a second aspect of the present invention, a method in a server having
performance information indicating power generation performance of each photovoltaic panel included in a photovoltaic power generation system for controlling the photovoltaic power generation system is provided.
[0013] The method includes the steps of: receiving weather information and demand information from one or more servers; and determining a required power amount from the demand information and a power generation amount of each photovoltaic panel to generate the required power amount by the photovoltaic power
generation system based on the weather information and the performance information.
[0014] In accordance with a third aspect of the present invention, a computer program for controlling a photovoltaic power generation system including a plurality of photovoltaic panels stored in a computer readable medium is provided.
[0015] The computer program causes a computer to function as: a database unit configured to store performance information indicating power generation performance of each photovoltaic panel; a receive unit configured to receive weather information and demand information from one or more servers; and a
determination unit configured to determine a required power amount from the demand information and a power generation amount of each photovoltaic panel to generate the required power amount by the photovoltaic power generation system based on the weather
information and the performance information.
[0016] Further objects and advantages of the present invention will be apparent from the following description of the exemplary embodiments of the invention as illustrated in the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 shows a system according to an embodiment of the present invention;
[0018] Fig. 2 is a block diagram of a control server according to an embodiment of the present invention;
[0019] Fig. 3 is a block diagram of a power generation system according to an embodiment of the present invention;
[0020] Fig. 4 shows a sequence diagram for
controlling the power generation system according to an embodiment of the present invention;
[0021] Figs. 5A and 5B respectively show a front view and a rear view of a photovoltaic panel according to an embodiment of the present invention;
[0022] Fig. 6 shows the photovoltaic panel in the folded condition according to an embodiment of the present invention; and
[0023] Fig. 7 shows a movement of the photovoltaic panel according to an embodiment of the present
invention. DETAILED DESCRIPTION
[0024] Fig. 1 shows an exemplary system according to an embodiment of the present invention. According to Fig. 1, a control server 1 can communicate with a power generation system 2, power demand servers 4 and a weather server 5 via a network 3. The power demand servers 4 includes, for example, a Home Electric
Control System (HEMS) and a server operated by an electric provider, and has demand information about a power amount required by consumers. In the present embodiment, the power demand servers 4 are indicated as a plurality of apparatuses. However, it may be
realized as a single computer. [0025] The weather server 5 provides weather information about the place where the power generation system 2 is deployed. The power generation system 2 according to the present embodiment is a photovoltaic power generation system using solar energy and includes a plurality of photovoltaic panels having a plurality of photovoltaic cells. According to the preset
embodiment, each photovoltaic panel in the power generation system 2 is configurable to adjust a power generation amount. More specifically, each
photovoltaic panel can be tilted, rotated and/or folded to adjust the power generation amount.
[0026] The control server 1 gathers the demand information from the power demand servers 4, and determines a required power amount by consumer based on the demand information. Further, the control server 1 gathers the weather information from the weather server 5, and determines a power generation amount of each photovoltaic panel to generate the required power amount based on the weather information and performance of each photovoltaic panel in the power generation system 2. The control server 1 informs the power generation system 2 of the power generation amount of each photovoltaic panel.
[0027] Fig. 2 shows an exemplary block diagram of the control server 1. The server 1 is realized by one or more computers and has a database unit 11, a determination unit 12, a control unit 13 and a receive unit 14. The database unit 11, the determination unit 12, the control unit 13 and the receive unit 14 may be realized by one or more programs executed by the one or more computers.
[0028] The database unit 11 of the control server
1 has performance information, use period information and policy information. The performance information indicates, for each photovoltaic panel, a relation between a power generation amount and an amount of solar-ray. Thus, the performance information is used to determine the power generation amount of each photovoltaic panel under the condition of the current weather obtained from the weather information.
[0029] The use period information indicates, for each photovoltaic panel, a used period. Since the performance of each photovoltaic panel may degrade with age, the use period information may be used to
determine the power generation amount of each
photovoltaic panel. Further, use period information indicates a used period of its supporting and driving members, such as motors.
[0030] The policy information provide criteria to select one combination of power generation amount of each photovoltaic panel if a plurality of combination of power generation amount of each photovoltaic panel are available to generate the required power amount. [0031] For example, there are 3 photovoltaic panels A, B and C, and photovoltaic panels A, B and C can respectively generate the maximum lOkW, lOkW and 5kW under the current weather conditions. If the required power amount is 18kW, the one possible
combination is that photovoltaic panels A, B and C respectively generate lOkW, 8kW and OkW. Another possible combination is that photovoltaic panels A, B and C respectively generate 6kW, 6kW and 6kW. Of course, there are a lot of other possible combinations.
[0032] The server 1 selects one combination if a plurality of combinations is available. For example, the policy information may indicate that each
photovoltaic panel should generate equal amounts as much as possible. In this case, the serve 1 determines the power generation amounts of photovoltaic panels A, B and C are 6kW, 6kW and 6kW. Alternatively the policy information may indicate that a newer photovoltaic panel should generate more than an older one as far as possible.
[0033] Further, the policy information according to the present embodiment may include a total amount of rotation for a motor associated with a photovoltaic panel for adjusting a direction of the photovoltaic panel. Here, the motor associated with the
photovoltaic panel is used to adjust the power
generation amount of the photovoltaic panel by rotating, tilting and/or folding the photovoltaic panel. If the same motor is driven for a long duration of time or for short periods but frequently, it may shorten the lifetime of the motor. Thus, the server 1 may use the total amount of rotation of each motor for determining the power generation amount of each photovoltaic panel such that the total amount of rotation of each motor is kept at a similar level.
[0034] The determination unit 12 of the control server 1 determines the power generation amount of each photovoltaic panel in the power generation system 2 to generate the required power amount determined by the demand information based on the weather information from the weather server 5 and information stored in the database unit 11.
[0035] Further, the determination unit 12 may use the status information received from the power
generation system 2. The status information includes information of a current power generation amount and a current configuration of each photovoltaic panel. The current configuration information of each photovoltaic panel indicates a current elevation angle and
horizontal angle with reference to a reference
direction and/or the angle of folding of each
photovoltaic panel.
[0036] The control unit 13 of the control server 1 sends a control message to the power generation system 2 to inform power generation system 2 of the power generation amount of each photovoltaic panel. The receive unit 14 of the control server 1 receives the demand information from the power demand servers 4, the weather information from the weather server 5 and the status information from the poser generation system 2.
[0037] Fig. 4 shows a sequence diagram for
controlling the power generation system 2. The
sequence in Fig. 4 may be repeated at regular intervals.
[0038] In step S301, the power generation system 2 sends the status information to inform the control server 1 of current output from each photovoltaic panel, a current configuration of each photovoltaic panel and the like. The step S301 may be performed when the status changes, at regular intervals, or triggered by other events.
[0039] In step S302, the receive unit 14 of the control server 1 receives the demand information from the demand servers 4 and the weather information from the weather server 5. In step S303, the determination unit 12 of the control server 1 determines a required power based on the demand information and a power generation amount of each photovoltaic panel such that the power generation system 2 generates the required amount.
[0040] For example, based on the performance information and the weather information, the determination unit 12 can determine the maximum power generation amount of each photovoltaic panel. The determination unit 12 may use the use period
information to determine the maximum power generation of each photovoltaic panel. Further, the determination unit 12 may use a current power generation amount and a current configuration of a photovoltaic panel obtained from the status information to determine the maximum power generation of the photovoltaic panel.
[0041] Then, the determination unit 12 may
determine possible combinations of the power generation amount of each photovoltaic panel to generate the required power, and select one combination using the policy information.
[0042] In step S304, the control unit 13 sends a control message to the power generation system 2 to inform the power generation system 2 of the power generation amount of each photovoltaic panel. The control message may include the absolute value of the power generation amount for each photovoltaic panel such as "3kW" or a change amount with reference to the current power generation amount for each photovoltaic panel such as "decrease or increase by 30%."
[0043] Fig. 3 shows a block diagram of the power generation system 2 according to the present embodiment. According to Fig. 3, the power generation system 2 includes a measurement unit 21, a reporting unit 22, an actuation control unit 23 and a photovoltaic panel 24.
[0044] The measurement unit 21 measures a current power generation amount of the photovoltaic panel 24, and the actuation control unit 23 controls the
photovoltaic panel 24 in response to a reception of the control message from the control server 1. The
actuation control unit 23 controls the photovoltaic panel 24 such that the photovoltaic panel 24 generates the power amount indicated in the control message by monitoring the power generation amount of the
photovoltaic panel 24 obtained by the measurement unit 21.
[0045] For example, if it is required to increase the power generation amount of the photovoltaic panel 24 by lkW, the actuation control unit 23 obtains the current power generation amount of the photovoltaic panel 24, and adjusts an elevation angle and horizontal angle or folds the photovoltaic panel 24 to increase the power generation amount by lkW.
[0046] Fig. 5A is a front view of the photovoltaic panel 24, and Fig. 5B is a rear view of the
photovoltaic panel 24 according to the present
exemplary embodiment. The photovoltaic panel 24 has a plurality of photovoltaic cells 25 on the front surface. On the rear surface, a plurality of actuators 29, a control IC 27, a memory 28 and the measurement unit 21 are provided. The control IC 27 executes programs stored in the memory 28, and act as the reporting unit 22 and the actuation control unit 23. The measurement unit 21 monitors the power generation amount of the photovoltaic panel 24.
[0047] According to the present embodiment, the photovoltaic panel 24 has the on-board actuators 29, and by driving the actuators 29, the photovoltaic panel 24 can be folded as shown in Fig. 6 along a folding line 26 for increasing or decreasing the power
generation amount. The actuators 29 may be small motors or piezoelectric devices. Further, as shown in Fig. 7, the photovoltaic panel 24 is installed such that the photovoltaic panel 24 is rotated and tilted by using one or more motors, which is not shown, to adjust a direction of the photovoltaic panel 24 for increasing or decreasing the power generation amount. The
direction of a photovoltaic panel 24 may be defined as a normal direction of the photovoltaic panel 24. The actuation control unit 23 controls the actuators 29 and/or the motor for tilting and rotating the
photovoltaic panel 25.
[0048] As described above, the server 1 can balance the power generation amount with the demand. According to the above described embodiment, the server 1 informs the power generation system 2 of the power generation amount for each photovoltaic panel 24.
However, the server 1 may inform of a configuration of each photovoltaic panel 24, i.e. an elevation angle, a horizontal angle and a folding angle in addition to the power generation amount. In this case, the actuation control unit 23 of the power generation system 2 uses the informed elevation angle, horizontal angle and folding angle as a reference, and adjusts them to generate the power amount informed from the server 1.
[0049] Further, in case the batteries are provided in the power generation system 2, the server 1 may determine the required power such that the power generation system 2 charges the batteries in case the demand is small, and use the batteries for providing power to consumers in case the demand is large.
Further, the server 1 may control some of electric devices such that the electric device is turned on in case the possible generation amount is larger than the current required power.
[0050] The invention may be achieved by a program, which realizes the functions of the above embodiments. Programs defining functions on the invention can be delivered to the control server 1 using non-transitory computer-readable storage media or via a network. It should be understood the invention may be implemented by software, hardware or a combination of software and hardware.
[0051] Many modifications and variations will be apparent to those of ordinary skill in the art. The present embodiments were chosen and described in order to best explain the principles of the invention. It should be understood that the present invention is not limited to the specific embodiments described in the specification.

Claims

1. A server (1) for controlling a photovoltaic power generation system (2) including a plurality of
photovoltaic panels (24), comprising:
a database unit (11) configured to store
performance information indicating power generation performance of each photovoltaic panel (24);
a receive unit (14) configured to receive weather information and demand information from one or more servers (4, 5); and
a determination unit (12) configured to determine a required power amount from the demand information and a power generation amount of each photovoltaic panel (24) to generate the required power amount by the photovoltaic power generation system (2) based on the weather information and the performance information.
2. The server (1) according to claim 1,
wherein the receive unit (14) is further
configured to receive status information including a current power generation amount and a direction of each photovoltaic panel (24) from the photovoltaic power generation system (2), and
wherein the determination unit (12) is further configured to use the status information to determine the power generation amount of each photovoltaic panel (24) .
3. The server (1) according to claim 1 or 2, wherein the database unit (11) is further configured to store use period information of each photovoltaic panel (24), and
wherein the determination unit (12) is further configured to use the use period information to determine the power generation amount of each
photovoltaic panel (24).
4. The server (1) according to any one of claims 1 to 3,
wherein the database unit (11) is further configured to store policy information providing criteria to select one combination of power generation amount of each photovoltaic panel (24) if a plurality of combinations of power generation amount of each photovoltaic panel (24) are available to generate the required power amount by the photovoltaic power generation system (2), and
wherein the determination unit (12) is further configured to use the policy information to determine the power generation amount of each photovoltaic panel (24) .
5. The server (1) according to claim 4,
wherein a direction of a photovoltaic panel (24) is adjusted by a motor,
wherein the policy information includes a total amount of rotation of each motor, and
wherein the determination unit (12) is further configured to use the total amount of rotation of each motor to determine the power generation amount of each photovoltaic panel (24).
6. The server (1) according to any one of claims 1 to 5, further comprising a control unit (13) configured to send a control message to the photovoltaic power generation system (2),
wherein the control message indicates an absolute value of the power generation amount for each
photovoltaic panel (24).
7. The server (1) according to any one of claims 1 to 5, further comprising a control unit (13) configured to send a control message to the photovoltaic power generation system (2),
wherein the control message indicates a change amount of the power generation amount for each
photovoltaic panel (24).
8. A method in a server (1) having performance information indicating power generation performance of each photovoltaic panel (24) included in a photovoltaic power generation system (2) for controlling the
photovoltaic power generation system (2), comprising the steps of:
receiving (S302) weather information and demand information from one or more servers (4, 5); and
determining (S303) a required power amount from the demand information and a power generation amount of each photovoltaic panel (24) to generate the required power amount by the photovoltaic power generation system (2) based on the weather information and the performance information.
9. The method according to claim 8,
wherein the receiving step (S302) includes
receiving (S301) status information from the
photovoltaic power generation system including a
current power generation amount and a direction of each photovoltaic panel (24), and
wherein the determining step (S303) further includes using the status information to determine the power generation amount of each photovoltaic panel (24).
10. The method according to claim 8 or 9,
wherein the server (1) has use period information of each photovoltaic panel (24), and
wherein the determining step (S303) further includes using the use period information to determine the power generation amount of each photovoltaic panel (24) .
11. The method according to any one of claims 8 to 10,
wherein the server (1) has policy information providing criteria to select one combination of power generation amount of each photovoltaic panel (24) if a plurality of combinations of power generation amount of each photovoltaic panel (24) are available to generate the required power amount by the photovoltaic power generation system (2), and
wherein the determining step (S303) further includes using the policy information to determine the power generation amount of each photovoltaic panel (24).
12. The method according to claim 11,
wherein a direction of a photovoltaic panel (24) is adjusted by a motor,
wherein the policy information includes a total amount of rotation of each motor, and
wherein the determining step (S303) further includes using the total amount of rotation of each motor to determine the power generation amount of each photovoltaic panel (24).
13. The method according to any one of claims 8 to 12, further comprising the step of sending (S304) a control message to the photovoltaic power generation system ( 2 ) ,
wherein the control message indicates an absolute value of the power generation amount for each
photovoltaic panel (24).
14. The method according to any one of claims 8 to 12, further comprising the step of sending (S304) a control message to the photovoltaic power generation system ( 2 ) ,
wherein the control message indicates a change amount of the power generation amount for each
photovoltaic panel (24).
15. A computer program for controlling a photovoltaic power generation system (2) including a plurality of photovoltaic panels (24) and stored in a computer readable medium, the computer program for causing a computer to function as:
a database unit (11) configured to store
performance information indicating power generation performance of each photovoltaic panel (24);
a receive unit (14) configured to receive weather information and demand information from one or more servers (4, 5); and
a determination unit (12) configured to determine a required power amount from the demand information and a power generation amount of each photovoltaic panel (24) to generate the required power amount by the photovoltaic power generation system (2) based on the weather information and the performance information.
PCT/SE2012/051056 2012-10-04 2012-10-04 Server for controlling photovoltaic power generation system WO2014054987A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636931A (en) * 1985-06-28 1987-01-13 Shikoku Denryoku Kabushiki Kaisha Photovoltaic power control system
US20080097655A1 (en) * 2006-10-19 2008-04-24 Tigo Energy, Inc. Method and system to provide a distributed local energy production system with high-voltage DC bus
US20110172835A1 (en) 2008-09-25 2011-07-14 Imes Kevin R System and method of curtailing energy production within congestive grid operating environments
US20110224831A1 (en) * 2010-03-10 2011-09-15 Greg Beardsworth Photovoltaic system with managed output and method of managing variability of output from a photovoltaic system
US20110307101A1 (en) 2009-08-21 2011-12-15 Imes Kevin R Energy management system and method
DE102010043611A1 (en) * 2010-11-09 2012-05-10 Raimund Feuchtgruber Method for controlling distribution of electrical power to consumer network in e.g. office building, involves controlling operation of consumers until amount of power-deployable photovoltaic plant exceeds amount of power threshold value

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636931A (en) * 1985-06-28 1987-01-13 Shikoku Denryoku Kabushiki Kaisha Photovoltaic power control system
US20080097655A1 (en) * 2006-10-19 2008-04-24 Tigo Energy, Inc. Method and system to provide a distributed local energy production system with high-voltage DC bus
US20110172835A1 (en) 2008-09-25 2011-07-14 Imes Kevin R System and method of curtailing energy production within congestive grid operating environments
US20110307101A1 (en) 2009-08-21 2011-12-15 Imes Kevin R Energy management system and method
US20110224831A1 (en) * 2010-03-10 2011-09-15 Greg Beardsworth Photovoltaic system with managed output and method of managing variability of output from a photovoltaic system
DE102010043611A1 (en) * 2010-11-09 2012-05-10 Raimund Feuchtgruber Method for controlling distribution of electrical power to consumer network in e.g. office building, involves controlling operation of consumers until amount of power-deployable photovoltaic plant exceeds amount of power threshold value

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