CN105703391A - Generator system and related method for operating generation system - Google Patents
Generator system and related method for operating generation system Download PDFInfo
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- CN105703391A CN105703391A CN201510912458.9A CN201510912458A CN105703391A CN 105703391 A CN105703391 A CN 105703391A CN 201510912458 A CN201510912458 A CN 201510912458A CN 105703391 A CN105703391 A CN 105703391A
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- 230000006698 induction Effects 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 92
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 description 15
- 239000000446 fuel Substances 0.000 description 6
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Classifications
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- 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
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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H02J3/383—
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- 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
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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
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a generator system and a related method for operating a generation system. The invention discloses a generation system. The generation system comprises a double-feed induction generator coupled to a variable-speed generator (DFIG) and a photovoltaic (PV) power supply. The DFIG comprises a generator which generates first power which is at least partially based on the operation speed of the variable-speed generator; the PV power supply supplies second power to a DC chain between a rotor side converter and a circuit side converter; the generator and the circuit side converter are coupled to the power grid and/or the local electric load in order to supply at least part of the first power and second power to the local electric load.
Description
Technical field
Present application relates generally to the generation of electrical power, and more particularly to adopting the electricity generation system of adjustable engine and photovoltaic (PV) power supply。
Background technology
Generally, electricity generation system, such as electromotor use the fuel of such as diesel oil, gasoline etc. to generate electrical power, and it can be supplied to local electrical load。Reduce fuel consumption be realize low cost and environmentally friendly electricity generation system aspect just carry out effort。For this, various hybrid power systems are available, and the electromotor operated by constant speed engine is used as main power source by it, and some form of regenerative resource, such as wind turbine are used as accessory power supply。
In this kind of hybrid power system, along with the amount of the power generated by regenerative resource increases, the power that the electromotor operated by constant speed engine generates needs to reduce。For doing so, constant speed engine needs to operate with low-load。Generally, constant speed engine has poor efficiency under the load lower than certain threshold limit (such as 25%)。Additionally, constant speed engine is operated negatively affecting the health of whole maintenance period and constant speed engine with this kind of low-load。
Summary of the invention
According to embodiments of the invention, open a kind of electricity generation system。This electricity generation system comprises adjustable engine, double fed induction generators (DFIG) and photovoltaic (PV) power supply。DFIG comprises the speed of operation being at least partially based on adjustable engine and generates the electromotor of the first electrical power, the rotor-side converter being electrically coupled to electromotor and line side transducer, and wherein rotor-side converter and line side transducer are electrically coupled to one another via direct current (DC) link。PV power supply generates the second electrical power。PV power supply is electrically coupled to DC link to supply the second electrical power on DC link, wherein electromotor and line side transducer are additionally coupled at least one of local electrical load and electrical network, to supply at least some of of the first electrical power and the second electrical power to local electrical load。
According to embodiments of the invention, a kind of method for operating the electricity generation system adopting DFIG is disclosed。DFIG comprises the electromotor being electrically coupled to rotor-side converter and point of common coupling (PCC), and PCC is electrically coupled at least one of line side transducer and local electrical load and electrical network。At least one in amount that the method comprises the second electrical power that the DC link between based on PV power supply rotor-side converter and line side transducer at DFIG is supplied and the local load request of electrical load, the availability of grid power, rotor-side converter and the rated power of line side transducer, the efficiency of adjustable engine and the efficiency of rotor-side converter and line side transducer determines the expection speed of operation of the adjustable engine being mechanical coupling to electromotor。The method also comprises with determined speed of operation to operate adjustable engine, in order to generated the first electrical power by electromotor。Additionally, the method also comprise to PCC supply the first electrical power and the second electrical power at least one of at least one。
According to embodiments of the invention, open a kind of electricity generation system。This electricity generation system comprises adjustable engine and DFIG。DFIG comprises the speed of operation being at least partially based on adjustable engine and generates the electromotor of the first electrical power, the rotor-side converter being electrically coupled to electromotor and line side transducer, and wherein rotor-side converter and line side transducer are electrically coupled to one another via DC link。This electricity generation system also comprises at least one in the energy accumulating device of PV power supply and supply the 3rd electrical power supplying the second electrical power to DC link, and wherein the speed of operation of adjustable engine is determined based at least one in the second electrical power and the 3rd electrical power。Additionally, electromotor and line side transducer are coupled to local electrical load, to supply at least some of of the first electrical power and the second electrical power to local electrical load。
Technical scheme 1: a kind of electricity generation system, including:
Adjustable engine；
Double fed induction generators (DFIG), wherein said DFIG includes being at least partially based on the speed of operation of described adjustable engine and generates the electromotor of the first electrical power, the rotor-side converter being electrically coupled to described electromotor and line side transducer, and wherein said rotor-side converter and described line side transducer are electrically coupled to one another via direct current (DC) link；And
Photovoltaic (PV) power supply, generates the second electrical power, and is electrically coupled to described DC link, to supply described second electrical power to described DC link,
Wherein said electromotor and described line side transducer are additionally coupled at least one in local electrical load and electrical network, to supply at least some of of described first electrical power and described second electrical power to described local electrical load。
Technical scheme 2: the electricity generation system as described in technical scheme 1, wherein, described adjustable engine can by utilizing diesel oil, natural gas, recycling waste heat, producer gas, biogas or its combination to operate。
Technical scheme 3: the electricity generation system as described in technical scheme 1, wherein, described PV power supply is coupled to described DC link via dc-dc。
Technical scheme 4: the electricity generation system as described in technical scheme 1, it is additionally included in and is operatively coupled to described adjustable engine, one or more central controller in described DFIG and described PV power supply, wherein said central controller is configured to the load request based on described local electrical load, the availability of grid power, the rated power of described rotor-side converter and described line side transducer, the amount of described second electrical power generated by described PV power supply, at least one in the efficiency of the efficiency of described adjustable engine and described rotor-side converter and described line side transducer controls the one or more operation in described adjustable engine and described DFIG。
Technical scheme 5: the electricity generation system as described in technical scheme 4, wherein, the described rated power of described rotor-side converter and described line side transducer selects based on by the maximum of producible described second electrical power of described PV power supply。
Technical scheme 6: the electricity generation system as described in technical scheme 5, wherein, each described rated power of described rotor-side converter and described line side transducer is equal to by the described the maximum amount of half of producible described second electrical power of described PV power supply。
Technical scheme 7: the electricity generation system as described in technical scheme 4, wherein, if to be configured to described grid power available for described central controller, is reduced to zero or substantially near zero by the described speed of operation of described adjustable engine。
Technical scheme 8: the electricity generation system as described in technical scheme 4, wherein, if it is available that described central controller is configured to described grid power, the described rated power according to the described amount of described second electrical power and described rotor-side converter and described line side transducer, supply at least some of of described second electrical power by least one in described rotor-side converter and described line side transducer to described local electrical load。
Technical scheme 9: the electricity generation system as described in technical scheme 4, wherein, if it is disabled that described central controller is configured to described grid power, the described amount of described second electrical power is less than described load request, and described adjustable engine is not reaching to expection speed of operation, then control to constitute the electric device set of described local electrical load, to reduce described load request。
Technical scheme 10: the electricity generation system as described in technical scheme 4, also includes the one or more energy accumulating devices being coupled to described PV power supply or described DC link。
Technical scheme 11: the electricity generation system as described in technical scheme 10, wherein, if it is disabled that described central controller is configured to described grid power, the described amount of described second electrical power is less than described load request, and described adjustable engine is not reaching to expection speed of operation, then to described local electrical load supply from the 3rd electrical power of the one or more energy storing device, to meet described load request。
Technical scheme 12: the electricity generation system as described in technical scheme 10, wherein, if described central controller is configured to described line side, transducer breaks down, then being stored in described second electrical power at least partially in the one or more energy accumulating device。
Technical scheme 13: the electricity generation system as described in technical scheme 10, wherein, if described central controller is configured to the requirement of described first electrical power lower than threshold value, then realize the part to described local electrical load supply from described 3rd electrical power of the one or more energy accumulating device。
Technical scheme 14: the electricity generation system as described in technical scheme 10, wherein, the one or more energy accumulating device is electrically coupled to described adjustable engine, to supply the power starting described adjustable engine。
Technical scheme 15: the electricity generation system as described in technical scheme 4, wherein, if it is disabled that described central controller is configured to described grid power, then the determined described speed of operation of described amount of described second electrical power to generate based on described load request and described PV power supply operates described adjustable engine。
Technical scheme 16: a kind of operation adopts the method for the electricity generation system of double fed induction generators (DFIG), wherein, described DFIG includes the electromotor being electrically coupled to rotor-side converter and point of common coupling (PCC), described PCC is electrically coupled at least one in line side transducer and local electrical load and electrical network, and described method includes:
Load request based on amount and the described local electrical load of the second electrical power supplied by direct current (DC) link between photovoltaic (PV) power supply described rotor-side converter and described line side transducer at described DFIG, the availability of grid power, the rated power of described rotor-side converter and described line side transducer, at least one in the efficiency of the efficiency of described adjustable engine and described rotor-side converter and described line side transducer determines the expection speed of operation of the adjustable engine being mechanical coupling to described electromotor；
Described adjustable engine is operated, in order to generated the first electrical power by described electromotor with determined speed of operation；And
To described PCC supply described first electrical power and described second electrical power at least some of at least one。
Technical scheme 17: the method as described in technical scheme 16, also include: if described grid power is disabled, the described amount of described second electrical power is less than described load request, and described adjustable engine is not reaching to expection speed of operation, then control to constitute the electric device set of described local electrical load, to reduce described load request。
Technical scheme 18: the method as described in technical scheme 16, also include: if described grid power is disabled, then determine the described speed of operation of described adjustable engine based on described load request and the described amount of described second electrical power that generated by described PV power supply。
Technical scheme 19: the method as described in technical scheme 16, also includes: if described rotor-side converter breaks down, then operate described electromotor according to autoexcitation pattern。
Technical scheme 20: a kind of electricity generation system, including:
Adjustable engine；
Double fed induction generators (DFIG), wherein said DFIG includes being at least partially based on the speed of operation of described adjustable engine and generates the electromotor of the first electrical power, the rotor-side converter being electrically coupled to described electromotor and line side transducer, and described rotor-side converter and described line side transducer are electrically coupled to one another via direct current (DC) link；And
At least one in photovoltaic (PV) power supply of the second electrical power and the energy accumulating device of supply the 3rd electrical power is supplied to described DC link, the described speed of operation of wherein said adjustable engine is determined based at least one in described second electrical power and described 3rd electrical power, and
Wherein said electromotor and described line side transducer are additionally coupled to local electrical load, to supply at least some of of described first electrical power and described second electrical power to described local electrical load。
Accompanying drawing explanation
Detailed description below is being read, it will being more fully understood that these and other feature of the present invention, aspect and advantage, in accompanying drawing, similar label represents similar component in the accompanying drawings in the whole text, and accompanying drawing includes with reference to accompanying drawing:
Fig. 1 is the block diagram of the distribution system according to embodiments of the invention；
Fig. 2 be describe according to embodiments of the invention, adjustable engine speed of operation and the corresponding power generated between the figure of example relationship represent；And
Fig. 3 (a) and Fig. 3 (b) is collectively as the flow chart illustrated according to embodiments of the invention, the exemplary method of operation electricity generation system。
Detailed description of the invention
With reference to drawings in detail described in this paper and description, this specification can be understood best。Hereinafter with reference to accompanying drawing, various embodiment is described。But, it will be clear to a person skilled in the art that and be merely for purposes of illustration herein for the detailed description given by these accompanying drawings, because method and system exceedes the scope of described embodiment。
Being described below in book and claims, singulative " ", " one ", " being somebody's turn to do " comprise plural reference, are explicitly indicated unless context separately adds。As used herein term "or" is not intended to exclusive, and indicates that the situation that at least one of cited assembly exists and the combination comprising wherein cited assembly can exist, and is explicitly indicated unless context separately adds。
Approximating language used herein can be applicable to modify any quantity that can permit changing in the present specification and claims in the whole text and represents, without the change causing relative basic function。Correspondingly, by such as " about " and the value modified of one or more terms of " substantially " be not limited to specified exact value。Here and in entire disclosure and claims, scope restriction can be passed through combination and/or exchange；This kind of scope is identified, and is included in all subranges comprised, unless context or language separately add instruction。
Term as used herein "available" and " can be " indicate the probability occurred in one group of situation；Have specified character, characteristic or function；And/or limit another verb by expressing the one or more of ability, capacity or probability associated with finite verb。Correspondingly, "available" and " can be " use instruction to modify term indicated capacity, function or use to be substantially suitably, can or be suitable for, considers to modify term there may come a time when it is not suitably, can or be suitable in some cases simultaneously。
Fig. 1 is the block diagram of the distribution system 100 according to embodiments of the invention。Distribution system 100 comprises electricity generation system 101, and it is coupled at least one in electrical network 102 and local electrical load 104 at point of common coupling (PCC) 105 place。In one embodiment of the invention, electricity generation system 101 can be coupled to PCC105 via transformator (not shown)。
Electrical network 102 can comprise the network of interconnection, for electric power being delivered to client (such as electrical load 104) from one or more electric station (different from electricity generation system 101) by high pressure/middle pressure power transmission line。Electrical load 104 can be made up of multiple electric devices (it consumes from electrical network 102 or the electric power carrying out self-generating system 101)。In some embodiments of the invention, for instance when islanding operation pattern (will be described after a while), electrical network 102 can be disabled。In certain embodiments of the present invention, although electricity generation system 101 is coupled to electrical network 102, but is likely to, due to fault or the power-off of electrical network 102, the power being absent from carrying from electrical network 102 in distribution system 100。
Electricity generation system 101 can comprise one or more adjustable engine, for instance adjustable engine 106, double fed induction generators (DFIG) 108 and photovoltaic (PV) power supply 110 and/or energy accumulating device 122。DFIG108 can comprise electromotor 112, rotor-side converter 114 and line side transducer 116。Additionally, electricity generation system 101 can comprise dc-dc 120 alternatively。In one embodiment of the invention, electricity generation system 101 can comprise any one of PV power supply 110 or energy accumulating device 122, and it is coupled to direct current (DC) link 118 between rotor-side converter 114 and line side transducer 116。And in certain embodiments, electricity generation system 101 can comprise both PV power supply 110 and energy accumulating device 122, it is coupled to the DC link 118 between rotor-side converter 114 and line side transducer 116。Additionally, electricity generation system 101 also can comprise central controller 124, it is operatively coupled at least one in adjustable engine 106, DFIG108, PV power supply 110, dc-dc 120 and energy accumulating device 122, to control its corresponding operating。
Adjustable engine 106 can represent that can help to rotate element (such as rotor) to (one or more) of electromotor 112 gives any system of controllable rotating motion。Such as, adjustable engine 106 can be internal combustion engine, and its speed of operation can change under the control of central controller 124。More particularly, adjustable engine 106 can be speed change reciprocating engine, and wherein the convert reciprocating motion of piston is the rotary speed of connected crank axle。Adjustable engine 106 can be operated by the burning of various fuel (including but not limited to diesel oil, natural gas, gasoline, LPG, biogas, producer gas etc.)。Adjustable engine 106 it be also possible to use recycling waste heat and operates。It should be noted that the scope of this specification limits for the adjustable engine 106 adopted in electricity generation system 101 and fuel type。
Adjustable engine 106 can mechanically be coupled to DFIG108。More particularly, the crank axle of adjustable engine 106 can be coupled to the rotor of electromotor 112, thus the rotor of rotary generator 112。In some embodiments of the invention, the crank axle of adjustable engine 106 can be coupled to the armature spindle of electromotor 112 by one or more gears。As it will be appreciated that owing to adjustable engine 106 couples with this of electromotor 112, the speed of operation that the rotary speed of the rotor of electromotor 112 also is able to according to adjustable engine 106 changes。
In one embodiment of the invention, electromotor 112 can be phase-wound rotor influence generator。Electromotor 112 comprises stator (not shown) and rotor (not shown)。Stator comprises the first electricity winding arranged thereon。Similarly, rotor comprises the second electricity winding arranged thereon。As it was earlier mentioned, rotor is mechanically coupled to adjustable engine 106。Therefore, electromotor 112 can generate the first power (voltage and current) according to the speed of operation of adjustable engine 106 with at least one in the electrical activation being supplied to the first electricity winding and/or the second electricity winding。Additionally, electromotor 112 is electrically coupled to PCC105, to provide the first electrical power at PCC105 place。More particularly, the first electricity winding (directly or indirectly) on stator is coupled to PCC105。
Stator side transducer 114 is electrically coupled to the second electricity winding on the rotor of line side transducer 116 and electromotor 112。In one example, rotor-side converter 114 and line side transducer 116 are electrically coupled to one another via direct current (DC) link 118。Line side transducer 116 can directly or be coupled to PCC105 via transformator。Rotor-side converter 114 exchanges (AC)-DC transducer or DC-AC with each may act as under the control of central controller 124 of line side transducer。
Additionally, electricity generation system 101 also comprises the PV power supply 110 being electrically coupled to DFIG108。PV power supply 110 generally comprises one or more PV array (not shown), and wherein each PV array can comprise at least one PV module。PV module can comprise the suitable layout of multiple PV unit (diode and/or transistor)。PV power supply 110 generates, according to solar energy isolation, weather conditions and/or time, the D/C voltage constituting the second electrical power。In some embodiments of the invention, PV power supply 110 can be electrically coupled to DFIG108 at DC link 118, to supply, to DC link 118, the second electrical power that PV power supply 110 generates。Additionally, in some other embodiments of the present invention, PV power supply 110 can be electrically coupled to DFIG108 at DC link 118 via dc-dc 120, to supply the second electrical power。
Owing to PV power supply 110 can be electrically coupled to DC link 118 to supply the second electrical power, so the rated power of rotor-side converter 114 and line side transducer 116 needs suitably to select。The rated power of rotor-side converter 114 and line side transducer 116 can be called can by each maximum amount of power manipulated of rotor-side converter 114 and line side transducer 116。In one embodiment of the invention, the rated power of rotor-side converter 114 and line side transducer 116 selects based on by the maximum (below also referred to as " PV rated value ") of producible second electrical power of PV power supply 110。Such as, the value of each rated power of rotor-side converter 114 and line side transducer 116 may be selected to the half equal to PV rated value。Therefore selected rotor-side converter 114 and the rated power of line side transducer 116 can help under the control of central controller 124 with its corresponding maximal efficiency to operate rotor-side converter 114 and line side transducer 116。
It addition, in some embodiments of the invention, electricity generation system 101 also can comprise the energy accumulating device 122 being coupled to PV power supply 110。More particularly, energy accumulating device 122 is coupled to DC link 118。In one embodiment of the invention, energy accumulating device 122 is coupled to DC link 118 by dc-dc 120。Exemplarily, energy accumulating device 122 can comprise the layout of one or more battery, capacitor etc.。
In one embodiment of the invention, central controller 124 can run the programmed instruction of the operation for controlling adjustable engine 106, DFIG108, multiple electric devices of composition this locality electrical load 104 and/or dc-dc 120。Exemplarily, central controller 124 can be general purpose computer。Alternatively, central controller 124 can be embodied as hardware element (such as having the circuit board of processor) or be embodied as the software operated on processor (such as COTS personal computer (PC) or microcontroller)。In certain embodiments, adjustable engine 106, rotor-side converter 114, line side transducer 116, energy accumulating device 122 and/or dc-dc 120 can comprise controller/control unit/electronic device, in order to control its corresponding operating under the monitoring of central controller 124。
Various operating conditions will be described to the operation of electricity generation system 101 now。
Electricity generation system 101 is operable in the island mode of the Mains Connected Mode of operation, the turn model of operation or operation。The Mains Connected Mode of operation is defined as grid power power and supplies/be available situation at PCC105 place from electrical network 102。The turn model of operation is defined as the operator scheme that electricity generation system 101 will be transformed into the island mode of operation from the Mains Connected Mode of operation。More particularly, this situation occurs when grid power cuts off and electricity generation system 101 needs to control into the abundant electrical power of generation with the load request of satisfied local electrical load 104。Similarly, the pattern definition operating isolated island is that electricity generation system 101 is not connected to electrical network 102 and is configured to individually meet the situation of load request。
Electrical network in operation connects, changes and/or in island mode, and central controller 124 is configured to control one or more operation of adjustable engine 106, DFIG108 and dc-dc 120 based at least one in the local load request of electrical load 104, the availability of grid power, rotor-side converter 114 and the rated power of line side transducer 116, PV power supply 110 amount of the second electrical power generated, the efficiency of adjustable engine 106 and the efficiency of rotor-side converter 114 and line side transducer 116。The efficiency of adjustable engine 106 may be defined as the percentage ratio of the chemical energy (energy such as generated) of the mechanical output output being converted to adjustable engine 106 because of the burning of fuel。Similarly, the efficiency of rotor-side converter 114 and line side transducer 116 can represent the ratio of corresponding output and input power。
Based on the detection of grid power, central controller 124 can determine that electricity generation system 101 must be operated at the Mains Connected Mode of operation。In the Mains Connected Mode of operation, if sufficient second electrical power is generated to meet load request by PV power supply 110, although then grid power is available, but electricity generation system 101 is preferably by the second electrical power, thus causing the environment of more environmental protection。In the Mains Connected Mode of operation, if the second electrical power generated is insufficient for load request, then all the other electrical power can be supplied from electrical network 102, to meet load request。When grid power from electrical network 102 be available time, central controller 124 is configured to the speed of operation of adjustable engine 106 be reduced to zero or substantially near zero。In one embodiment of the invention, central controller 124 can send the first control signal to adjustable engine 106, to stop its operation。But, in certain embodiments of the present invention, in order to avoid start delay, for instance in the notable variable situation that there is the second electrical power that PV power supply 110 generates, adjustable engine 106 is operable in extremely low speed (substantially near zero)。
The second electrical power generated by PV power supply 110 can be supplied to local electrical load 104 via rotor-side converter 114 and/or line side transducer 116。Owing to operating rotor-side converter 114 and the purpose of line side transducer 116 with its corresponding optimum efficiency, central controller 124 is configured to the rated power of the amount of the second electrical power, rotor-side converter 114 and line side transducer 116 that generates according to PV power supply 110 and/or efficiency determines the needs of operation rotor-side converter 114 and/or line side transducer 116。
Such as, if the amount of the second electrical power is less than the rated power of line side transducer 116, then the second electrical power is supplied to PCC105 via line side transducer 116。In order to realize supplying the second electrical power via line side transducer 116, central controller 124 transmits the second control signal to line side transducer 116, is thus operated as DC-DC converter by line side transducer 116。But, if the amount of the second electrical power of generating of PV power supply 110 is more than the rated power of line side transducer 116, then supplied the amount of the rated power equal to line side transducer 116 by line side transducer 116 (as DC-DC converter)。And the part exceeding the second electrical power of the rated power of line side transducer 116 can via the combination of rotor-side converter 114 and electromotor 112 to be supplied to PCC105, wherein electromotor 112 can be used as transformator。In order to realize providing the excess electron excess fraction of the second electrical power via rotor-side converter 114, central controller 124 transmits the 3rd control signal to rotor-side converter 114, thus rotor-side converter 114 is operated as DC-DC converter。More particularly, the excess electron excess fraction of the second electrical power can be supplied to the second electricity winding on the rotor of electromotor 112, and extracts from the first electricity winding the stator of electromotor 112。
In some embodiments of the invention, when electrical network 102 is when the position that electricity generation system 101 is mounted to be operated is disabled, electricity generation system 101 is operable in island mode。Alternatively, central controller 124 can by detect grid power be absent from determine that electricity generation system 101 must be operated at island mode。In the island mode of operation, adjustable engine 106 and PV power supply 110 may each be exercisable。The amount of the second electrical power that central controller 124 can be configured to the load request based on local electrical load 104, generated by PV power supply 110, the one or more speed of operation determining adjustable engine 106 from the rated power and/or efficiency of the amount of available 3rd electrical power of energy accumulating device 122, rotor-side converter 114 and line side transducer 116。
In some embodiments of the invention, central controller 124 is configured to control electricity generation system 101 so that the whole amount of the second electrical power that PV power supply 110 generates is for meeting load request。Therefore, central controller 124 can be configured to determine whether the second electrical power is insufficient for load request。If being determined that the second electrical power is insufficient for load request by central controller 124, then central controller 124 can be configured to be identified by the amount of expection first electrical power of electromotor 112。In one embodiment of the invention, if the requirement of the first electrical power is lower than threshold value, then central controller 124 is configured to realize supplying a part for the 3rd electrical power from energy accumulating device 122 via rotor-side converter 114 and electromotor 112 to PCC, and wherein electromotor 112 can be used as transformator。In this case, adjustable engine 106 may remain off。
In another embodiment of the present invention, central controller 124 is configured to determine the expection speed of operation of the adjustable engine 106 corresponding with the surplus of the load request can not supplied from the second electrical power。Central controller 124 can determine the expection speed of operation of adjustable engine 106 based on the relation (referring to Fig. 2) between the speed of operation of adjustable engine 106 and the corresponding power generated。
Fig. 2 be describe according to embodiments of the invention, adjustable engine 106 speed of operation and the corresponding power generated between the figure of example relationship represent 200。Figure represents that the X-axis 202 of 200 represents the speed of operation of adjustable engine 106, and figure represents that the Y-axis 204 of 200 represents correspondence the first quantity of power that electromotor 112 generates。Curve 206 represents the relation between the power 204 that the speed of operation 202 of adjustable engine 106 and electromotor 112 generate。It should be noted that figure represents the purpose that value represented in 200 illustrates that, and the various combination for the adjustable engine adopted in electricity generation system 101 and DFIG can be different。
This relation between speed of operation 202 with power 204 is storable in the memorizer associated with central controller 124。Exemplarily, this data can take form of look to store。Alternatively, central controller 124 can develop mathematical model based on the relation between speed of operation 202 as depicted in Figure 2 and power 204。
Such as, if the load request of local electrical load 104 is 200kW, and the second electrical power generated by PV power supply 110 is 100kW, then central controller 124 can determine that all the other power of 100kW needs to be supplied by adjustable engine 106。Therefore, central controller 124 be configured to based on relation as depicted in Figure 2 determine adjustable engine 106 to it is contemplated that speed of operation。Such as, based on the relation between speed of operation 202 and power 204, central controller 124 can determine that the expection speed of operation of adjustable engine should be about 1160rpm to generate the power of 100kW。
In addition, rated power according to line side transducer 116, a part for second electrical power can be supplied to PCC105 by line side transducer 116, and the remainder of the second electrical power needs to be supplied by rotor-side converter 114 according to association rated power, or vice versa。Such as, if the rated power of line side transducer 116 is 77kw, then the remainder (23kw) of the second electrical power require over rotor-side converter 114 on the rotor being supplied to electromotor 112 second electricity winding。Therefore, electromotor 112 stator first electricity winding can total first electrical power be 123kW, it can be supplied to PCC105。Therefore, the general power supplied at PCC place is 200kW。
In another example, when the second electrical power is such as disabled during night or during the maintenance of PV power supply 110, central controller 124 is configured to higher speed of operation to run adjustable engine 106。Such as, be available without the second electrical power, and load request remains as 200KW, then adjustable engine 106 needs to operate in the speed of operation of about 2000rpm。A part for generated electrical power can be provided by rotor-side converter 114 (such as by rotor-side converter 114 being operated as AC-DC converter) and line side transducer 116 (such as by being operated as DC-DC converter by line side transducer 116) under the control of central controller 124。
Additionally, in certain embodiments, when load request reduction and adjustable engine 106 still to operate when reducing speed of operation, a part for the first electrical power can be stored in energy accumulating device 122 under the control of central controller 124。Such as, in order to by the section store of the first electrical power in energy accumulating device 122, central controller 124 can be configured to operate line side transducer 116 and rotor-side converter 114 at least one as AC-DC converter。
Additionally, as it was earlier mentioned, electricity generation system 101 is also operable in transition operation pattern。If central controller 124 determines that grid power is not connected to, then central controller 124 controls adjustable engine 106, DFIG108 and/or dc-dc 120 to meet load request。As it was earlier mentioned, in the Mains Connected Mode of operation, adjustable engine 106 can turn off or operate at extremely low speed。If adjustable engine 106 remains shutoff at the Mains Connected Mode of operation, then central controller 124 is configured to determine when central controller 124 and starts immediately when grid power is discontinuous (that is, connecting) adjustable engine 106。In some embodiments of the invention, in order to start adjustable engine 106, the operable rotor-side converter 114 of central controller 124 or line side transducer 116, to realize supplying a part for the 3rd electrical power from energy accumulating device 122 to electromotor 112, thus electromotor 112 is operated as motor。The rotation of the rotor of electromotor 112 can drive again adjustable engine 106, thereby turns on adjustable engine 106。Little by little, adjustable engine 106 to be operated, to be changed into island mode as described above。
In some embodiments of the invention, in the turn model of operation, if the amount of the second electrical power is not reaching to expection speed of operation less than load request and adjustable engine 106, then central controller 124 is configured to control the electric device set of multiple electric devices of the local electrical load 104 of composition, to reduce load request。In one embodiment of the invention, central controller 124 is configured through turning off electric device set or the supply by the discontinuous electric power to electric device set, controls electric device set。In another embodiment of the present invention, central controller 124 is configured to according to low-power mode to operate electric device set, thus reduces load request。
Additionally, as it was earlier mentioned, energy accumulating device 122 may also couple to DC link 118。Therefore, in some embodiments of the invention, if the amount of the second electrical power is less than load request, and adjustable engine 106 is not reaching to expection speed of operation, then central controller 124 is configured to a part for the 3rd electrical power from energy accumulating device 122 to be supplied to local electrical load, to meet load request。
Operation Mains Connected Mode or operation island mode any one in, in certain embodiments, PV power supply 110 is operable in maximum power point (MPP), so that the energy capture from solar energy is maximum。Central controller 124 can be configured to control whether PV power supply operates at MPP based on load request and the first electrical power。
Additionally, the Mains Connected Mode of operation or operation island mode any one in, central controller 124 may be additionally configured to determine the whether normal operating of rotor-side converter 114 and line side transducer 116。If being determined that rotor-side converter 114 breaks down by central controller 124, then central controller 124 functional arrangement side transducer 116, so that the second electrical power generated by PV power supply 110 is whole in wherein。In this case, the rated power of line side transducer 116 needs at least equal to PV rated value。Additionally, electromotor 112 is operable in autoexcitation pattern。In autoexcitation pattern, reactive power can be supplied by the one or more Capacitor banks (not shown) of at least one in the second electricity winding on the rotor of the first electricity winding being coupled on stator and electromotor 112。
But, in one embodiment of the invention, if being determined that line side transducer 116 breaks down by central controller 124, then central controller 124 operates rotor-side converter 114, so that can the first electricity winding on stator be the whole in wherein of the second electrical power available, that generated by PV power supply 110。In this case, the rated power of rotor-side converter 114 needs at least equal to PV rated value。In another embodiment of the present invention, if being determined that line side transducer 116 breaks down by central controller 124, then central controller 124 operates rotor-side converter 114, so that a part for the second electrical power generated according to the rated power of rotor-side converter 114 is through wherein。But, in this case, meet a part for load request only。In some embodiments of the invention, if line side transducer 116 breaks down, then central controller 124 is configured to being stored in the second electrical power at least partially in energy accumulating device 122。
In addition, if being determined that rotor-side converter 114 and line side transducer 116 all break down by central controller 124, then central controller 124 can be configured to according to autoexcitation pattern to operate electromotor 112, and a part for load request can be supplied according to by the producible peak power of electromotor 112。In autoexcitation pattern, reactive power can be supplied by the one or more Capacitor banks of at least one in the second electricity winding on the rotor of the first electricity winding being coupled on stator and electromotor 112。If additionally, rotor-side converter 114 and line side transducer 116 all break down, then central controller 124 can be configured to operation dc-dc 120, the generate second electrical power to be stored in energy accumulating device 122。
Fig. 3 (a) and Fig. 3 (b) is collectively as the flow chart 300 illustrated according to embodiments of the invention, the exemplary method of the electricity generation system 101 of operation Fig. 1。Element in conjunction with Fig. 1 is described Fig. 3。As it was earlier mentioned, electricity generation system 101 is in distribution system 100, wherein electricity generation system 101 can be coupled to electrical network 102 and/or local electrical load 104。Additionally, electricity generation system 101 comprises coupled adjustable engine 106 as depicted in fig. 1, DFIG108, PV power supply 110 and/or dc-dc 120。It addition, DFIG108 comprises electromotor 112, rotor-side converter 114 and line side transducer 116。
In step 302 place, central controller 124 perform inspection, to determine whether grid power can be used。In step 302 place, if it is determined that grid power is available, then control to transfer to step 312 (being described after a while)。However, if it is determined that grid power is disabled, then central controller 124 can determine that electricity generation system 101 needs to operate in the island mode of operation。Alternatively, if electricity generation system 101 is mounted to when not having electrical network to operate at island mode when can be available, then to avoid step 302 especially。In the island mode of operation, the expection speed of operation of adjustable engine 106 can be determined by central controller 124, as shown in step 304。The expection speed of operation of adjustable engine 106 can be determined based at least one in the amount of the second electrical power supplied at DC link 118 by PV power supply 110 and the local load request of electrical load 104, rotor-side converter 114 and the rated power of line side transducer 116, the efficiency of adjustable engine 106 and the efficiency of rotor-side converter 114 and line side transducer 116。In certain embodiments, when energy device 122 is coupled to DC link 118, central controller 124 can determine the expection speed of operation of adjustable engine 106 based on the amount from available 3rd electrical power of energy accumulating device 122。
Additionally, adjustable engine 106 can operate (as shown at step 306) according to determined speed of operation, to be generated the first electrical power by electromotor 112。In step 308 place, supply the first electrical power to PCC105。It addition, as indicated in step 310, the second electrical power can be supplied to PCC105 by least one in rotor-side converter 114 and line side transducer 116, and its details has been described above in the above description。
Referring again to step 302, if it is determined that grid power is available, then controlling to transfer to step 312, wherein central controller 124 is configured to perform another and checks, with determine grid power whether discontinuous/lose。In step 312 place, if it is determined that grid power is discontinuous, then control to transfer to step 326 (being described after a while)。But, if it is determined that grid power exists (namely, it does not have discontinuous), then central controller 124 can determine that electricity generation system 101 needs to operate in the Mains Connected Mode of operation, wherein the expection speed of operation of adjustable engine 106 can be determined by central controller 124, as shown at step 314。More particularly, when grid power is available, the expection speed of operation of adjustable engine 106 can be zero or substantially near zero。Therefore, adjustable engine 106 can operate according to predetermined speed (such as zero or substantially near zero), as shown in step 316。
In step 318 place, inspection can be performed by central controller 124, to determine that the second electrical power generated by PV power supply 110 is sufficient for load request。If determining that the second electrical power is sufficient for load request in step 318, then supply the second electrical power at PCC105 place, as shown at step 320。Second electrical power is supplied by least one in rotor-side converter 114 and line side transducer 116 at PCC105 place under the control of central controller 124。But, if determining that the second electrical power is insufficient for load request in step 318 place, then in the second electrical power that the supply of PCC105 place is available, as denoted by step 322。Additionally, in step 324 place, its surplus of load request can be met by offer grid power, as depicted at step 324。
Referring again to step 312, if it is determined that grid power is discontinuous, then central controller 124 can determine that electricity generation system 101 must be operated at the turn model of operation, so that electricity generation system 101 to be changed into the island mode of operation。Therefore, in step 325 place, the expection speed of operation of adjustable engine can be determined by central controller 124。In some embodiments of the invention, because electricity generation system 101 must be turned into island mode, the determined expection in step 325 place speed of operation be identical in step 304 place determined expection speed of operation。
Additionally, in step 326 place, another inspection can be performed by central controller 124, whether the amount to determine the second electrical power is not reaching to the determined expection speed of operation in step 325 place less than load request and adjustable engine 106。In step 326 place, if it is determined that the second electrical power is not less than load request and adjustable engine 106 has reached the determined expection speed of operation in step 325 place, then control to transfer to step 306。But, in step 326 place, if it is determined that the second electrical power is not reaching to the determined expection speed of operation in step 325 place less than load request and adjustable engine 106, then another inspection can be performed by central controller 124, to determine whether one or more energy accumulating device, such as energy accumulating device 122 exist。
In step 328 place, if it is determined that energy accumulating device 122 exists, then to PCC105 supply from a part for the 3rd electrical power of energy accumulating device 122, to meet load request, as shown in step 330。In order to realize the supply of the part of the 3rd electrical power, central controller 124 can suitably operate dc-dc 120, rotor-side converter 114 and/or line side transducer 116。But, in step 328 place, if it is determined that energy accumulating device 122 is absent from, then can temporarily, at least control (such as turn off or operate according to low-power mode) and constitute the electric device set of local electrical load 104, to reduce load request, as shown in step 332。Subsequently, control to can be transferred to step 306。
Any one of above-mentioned steps and/or system element can be substituted as, reorder or remove, and additional step and/or system element can be inserted into, this depends on the needs of application-specific, and the system of above-described embodiment can use a large amount of suitably process and system element to realize, and it is not limited to any specific computer hardware, software, middleware, firmware, microcode etc.。
Additionally, above-mentioned example, excess syndrome and method step (those steps that such as can be performed by central controller 124) can by realizing based on the suitable code in the system of processor, such as universal or special computer。System and method different realize can according to different order, perform the part or all of of steps described herein parallel or substantially concurrently。Additionally, function can be realized by the various programming languages including but not limited to C++ or Java。This code can store or be adapted for storage in can access on the one or more tangible or nonvolatile computer-readable media to run stored code by the system based on processor, such as data bank chip, Local or Remote hard disk, CD are (namely, CD or DVD), memorizer or on other media。Noting, tangible medium may be included in the paper printing instruction on it or another kind of suitably medium。Such as, instruction electronically can be caught via the optical scanning of paper or other media, is then passed through compiling, explains or process in a suitable manner as required, and is then store in data bank or memorizer。
According to some embodiments of the present invention, by assuring that given load request is operated in optimum efficiency by transducer (rotor-side converter and line side transducer) and adjustable engine, electricity generation system can operate according to higher efficiency。Additionally, the abrasion of adjustable engine also can reduce, because lower speed of operation increases the service life of the internal mechanical components of adjustable engine。Fault tolerant mechanism can help completely or at least partially to realize load request as discussed above, and it is unrelated to break down with transducer。Additionally, PV power supply can be used as main power source, thus causing more eco-friendly electricity generation system。Additionally, in various embodiments described above, the first electrical power generated by the operation of adjustable engine can be used for the second electrical power from PV power supply and/or the 3rd electrical power from energy accumulating device is unavailable or is insufficient in the situation of load request。This controlled utilization from the power of adjustable engine helps to reduce total fuel consumption of adjustable engine, thus causes saving cost and eco-friendly electricity generation system。
The present invention is described according to some specific embodiments。Estimate that they are merely to illustrate, and be understood not to limit by any way。It will thus be appreciated that can it be modified, this is within the present invention and the scope of the appended claims。
It will be appreciated that disclosed above and other features and function variant or its alternative can be combined, to create many other different systems or application。Various unforeseen alternative, amendment, change or improvement wherein can be undertaken by those skilled in the art subsequently, and it is also contemplated that be comprised by claims below。
Claims (10)
1. an electricity generation system, including:
Adjustable engine；
Double fed induction generators (DFIG), wherein said DFIG includes being at least partially based on the speed of operation of described adjustable engine and generates the electromotor of the first electrical power, the rotor-side converter being electrically coupled to described electromotor and line side transducer, and wherein said rotor-side converter and described line side transducer are electrically coupled to one another via direct current (DC) link；And
Photovoltaic (PV) power supply, generates the second electrical power, and is electrically coupled to described DC link, to supply described second electrical power to described DC link,
Wherein said electromotor and described line side transducer are additionally coupled at least one in local electrical load and electrical network, to supply at least some of of described first electrical power and described second electrical power to described local electrical load。
2. electricity generation system as claimed in claim 1, wherein, described adjustable engine can by utilizing diesel oil, natural gas, recycling waste heat, producer gas, biogas or its combination to operate。
3. electricity generation system as claimed in claim 1, wherein, described PV power supply is coupled to described DC link via dc-dc。
4. electricity generation system as claimed in claim 1, it is additionally included in and is operatively coupled to described adjustable engine, one or more central controller in described DFIG and described PV power supply, wherein said central controller is configured to the load request based on described local electrical load, the availability of grid power, the rated power of described rotor-side converter and described line side transducer, the amount of described second electrical power generated by described PV power supply, at least one in the efficiency of the efficiency of described adjustable engine and described rotor-side converter and described line side transducer controls the one or more operation in described adjustable engine and described DFIG。
5. electricity generation system as claimed in claim 4, wherein, the described rated power of described rotor-side converter and described line side transducer selects based on by the maximum of producible described second electrical power of described PV power supply。
6. electricity generation system as claimed in claim 5, wherein, each described rated power of described rotor-side converter and described line side transducer is equal to by the described the maximum amount of half of producible described second electrical power of described PV power supply。
7. electricity generation system as claimed in claim 4, wherein, if to be configured to described grid power available for described central controller, is reduced to zero or substantially near zero by the described speed of operation of described adjustable engine。
8. electricity generation system as claimed in claim 4, wherein, if it is available that described central controller is configured to described grid power, the described rated power according to the described amount of described second electrical power and described rotor-side converter and described line side transducer, supply at least some of of described second electrical power by least one in described rotor-side converter and described line side transducer to described local electrical load。
9. electricity generation system as claimed in claim 4, wherein, if it is disabled that described central controller is configured to described grid power, the described amount of described second electrical power is less than described load request, and described adjustable engine is not reaching to expection speed of operation, then control to constitute the electric device set of described local electrical load, to reduce described load request。
10. electricity generation system as claimed in claim 4, also includes the one or more energy accumulating devices being coupled to described PV power supply or described DC link。
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| IN6289/CHE/2014 | 2014-12-12 | ||
| IN6289CH2014 | 2014-12-12 |
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| CN105703391A true CN105703391A (en) | 2016-06-22 |
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| CN201510912458.9A Pending CN105703391A (en) | 2014-12-12 | 2015-12-11 | Generator system and related method for operating generation system |
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| CN110296005B (en) * | 2019-06-28 | 2022-04-15 | 潍柴重机股份有限公司 | Natural gas engine double-output mode control system and control method |
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Application publication date: 20160622 |