EP3658769A1 - Système de génération d'énergie hybride et son procédé associé - Google Patents

Système de génération d'énergie hybride et son procédé associé

Info

Publication number
EP3658769A1
EP3658769A1 EP18838548.8A EP18838548A EP3658769A1 EP 3658769 A1 EP3658769 A1 EP 3658769A1 EP 18838548 A EP18838548 A EP 18838548A EP 3658769 A1 EP3658769 A1 EP 3658769A1
Authority
EP
European Patent Office
Prior art keywords
power generation
coupled
generation system
conversion
conversion units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18838548.8A
Other languages
German (de)
English (en)
Other versions
EP3658769A4 (fr
Inventor
Yashomani Y KOLHATKAR
Arvind Kumar Tiwari
John Leo BOLLENBECKER
Ravisekhar Nadimpalli RAJU
Rajini Kant BURRA
Govardhan Ganireddy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
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
Priority claimed from US15/663,603 external-priority patent/US10641245B2/en
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP3658769A1 publication Critical patent/EP3658769A1/fr
Publication of EP3658769A4 publication Critical patent/EP3658769A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4807—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having a high frequency intermediate AC stage
    • 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
    • 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
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • Embodiments of the present disclosure generally relate to integration of a wind power generation subsystem and a supplementary power generation subsystem using a direct current (DC) source and in particular, to integration of the wind power generation subsystem with other power generation subsystems, such as a solar power generation subsystem, an energy storage device based power generation subsystem, or both.
  • DC direct current
  • a power generation subsystem based on renewable energy sources such as solar and wind energy source
  • a power generation subsystem based on a non-renewable energy source is employed along with a power generation subsystem based on a non-renewable energy source.
  • renewable energy sources are widely available and environmental friendly, in some situations such sources are not reliable with respect to production of power. Reliability may be increased by using power generation subsystems based on two or more sources of renewable energy.
  • One such hybrid power generation system includes the wind power generation subsystem integrated to any DC source based power generation subsystem.
  • the hybrid power generation system typically, in the hybrid power generation system only one circuit element may be grounded. Grounding more than one circuit elements of the hybrid power generation system may result in a leakage current flow in the hybrid power generation system.
  • high capacity transformers may need to be employed for isolating different portions of the hybrid power generation system which have corresponding grounded circuit elements. Use of the high capacity transformers increases the footprint and cost of the hybrid power generation system.
  • the hybrid power generation system includes a first power generation subsystem.
  • the first power generation subsystem includes a prime mover driving a generator including a rotor and a stator, one or more first conversion units coupled to at least one of the rotor and the stator, a first direct current (DC) link, and one or more second conversion units coupled to a corresponding one or more first conversion units via the first DC link.
  • the hybrid power generation system includes one or more second power generation subsystems coupled to the first power generation subsystem.
  • the hybrid power generation system includes one or more power conversion subunits including one or more first bridge circuits coupled to a corresponding one or more second bridge circuits via one or more transformers, where at least one of the one or more second power generation subsystems and the first power generation subsystem includes the one or more power conversion subunits.
  • a power system in accordance with another aspect of the present specification, includes an electrical grid. Further, the power system includes a wind based power generation subsystem coupled to the electrical grid.
  • the wind based power generation subsystem includes a wind driven doubly fed induction generator having a rotor and a stator. Further, the wind based power generation subsystem includes one or more first conversion units coupled to the rotor, a first direct current (DC) link, and one or more second conversion units coupled to a corresponding one or more first conversion units via the first DC link.
  • the power system includes one or more DC source based power generation subsystems coupled to the wind based power generation subsystem.
  • the power system includes one or more power conversion subunits including one or more first bridge circuits coupled to a corresponding one or more second bridge circuits via one or more transformers, where at least one of the one or more DC source based power generation subsystems and the wind based power generation subsystem includes the one or more power conversion subunits.
  • FIG. 1 is a diagrammatical representation of a hybrid power generation system, according to aspects of the present specification
  • FIG. 2 is a diagrammatical representation of one embodiment of a hybrid power generation system, according to aspects of the present specification
  • FIG. 3 is a diagrammatical representation of yet another embodiment of a hybrid power generation system, according to aspects of the present specification
  • FIG.4 is a diagrammatical representation of an embodiment of a hybrid power generation system having modular first conversion units, according to aspects of the present specification.
  • FIG 5 is a diagrammatical representation of an embodiment of a hybrid power generation system having distributed DC source based power generation subsystems, according to aspects of the present specification.
  • circuit and circuitry and controller may include either a single component or a plurality of components, which are either active and/or passive and are connected or otherwise coupled together to provide the described function.
  • the hybrid power generation system includes a first power generation subsystem coupled to a second power generation subsystem.
  • the first power generation subsystem and the second power generation subsystem may be selectively electrically isolated to prevent flow of leakage current in the hybrid power generation system.
  • coupling of a second power generation subsystem and the first power generation subsystem is achieved without using a common mode filter. It may be noted that use of the common mode filter typically increases the footprint of the hybrid power generation system.
  • FIG. 1 presents a diagrammatical representation 100 of an example hybrid power generation system.
  • the hybrid power generation system 100 includes a first power generation subsystem coupled to a second power generation subsystem.
  • the first power generation subsystem includes a wind based power generation subsystem 102.
  • the second power generation subsystem includes a DC source based power generation subsystem 104.
  • the DC source based power generation subsystem 104 includes a solar based power generation subsystem, an energy storage device based power generation subsystem, or any other energy source based power generation subsystem.
  • the energy storage device based power generation subsystem is a battery bank based power generation subsystem.
  • any other energy source based power generation subsystem includes a thermal based power generation subsystem, a hydroelectric based power generation subsystem, and the like.
  • the wind based power generation subsystem 102 includes a generator 106, a first conversion unit 108, and a second conversion unit 110.
  • the first conversion unit 108 is coupled to the second conversion unit 1 10 via a first DC link 112.
  • the first conversion unit 108 may be referred to as a rotor side converter and the second conversion unit 1 10 may be referred to as a line side converter.
  • the first conversion unit 108 is an alternating current (AC) to DC converter.
  • the second conversion unit 110 is a DC to AC converter.
  • the first conversion unit 108 and the second conversion unit 110 may be a bidirectional converter.
  • each of the first conversion unit 108 and the second conversion unit 110 may be single stage converters.
  • each of the first conversion unit 108 and the second conversion unit 110 may include a plurality of bridge circuits coupled in parallel.
  • the generator 106 may be driven by a prime mover.
  • the generator 106 is a doubly fed induction generator.
  • the doubly fed induction generator may be a wind driven doubly fed induction generator.
  • the generator 106 includes a stator 114 and a rotor 116.
  • the first conversion unit 108 is coupled to the rotor 116. Further, the stator 114 and the second conversion unit 110 are coupled to a first transformer 118. Furthermore, the stator 114 is coupled to a grid 120 via the first transformer 118. The grid 120 may be alternatively referred to as an electrical grid. In one embodiment, the first transformer 118 is a star grounded transformer.
  • a sinusoidal multiphase (e. g. three-phase) AC power is provided to the first conversion unit 108 via the rotor bus 116a.
  • the sinusoidal multiphase AC power may be a low voltage (LV) AC power, in one embodiment.
  • the first conversion unit 108 converts the LV AC power provided from the rotor bus 116a into DC power and provides the DC power to the DC link 112.
  • the DC power provided to the DC link 112 may be a LV DC power.
  • the second conversion unit 110 converts the LV DC power on the DC link 112 into a low voltage (LV) AC power suitable for the grid 120.
  • the stator 114 is configured to provide a MV AC power on a stator bus 114a of the wind based power generation subsystem 102.
  • the MV AC power from the second conversion unit 110 is combined with the MV AC power from the stator 114 of the generator 106 and multiphase MV power having a frequency (e.g. 50 Hz/60 Hz) is provided to the grid 120.
  • the DC source based power generation subsystem 104 is coupled to the wind based power generation subsystem 102 at the DC link 112.
  • the DC source based power generation subsystem 104 includes a solar array /battery bank 124, a DC to DC converter 126, and a power conversion subunit 128.
  • a battery bank 124 use of any other energy storage device is anticipated.
  • the terms "solar array” and “battery bank,” may be used interchangeably for the reference numeral 124.
  • the term "solar array,” as used herein, refers to a combination of a plurality of photovoltaic modules. In one example, the solar array may be a solar panel.
  • the term “battery bank,” as used herein, refers to a combination of a plurality of battery modules or batteries.
  • the present specification describes a DC source based power generation subsystem 104 having a solar array 124 in great detail.
  • the solar array 124 is coupled to the DC link 112 via the DC to DC converter 126 and the power conversion subunit 128.
  • the power conversion subunit 128 includes a first bridge circuit 130 coupled to a second bridge circuit 132 via a second transformer 134.
  • the first bridge circuit 130 is coupled to a first winding 136 of the second transformer 134 and the second bridge circuit 132 is coupled to a second winding 138 of the second transformer 134.
  • the first winding 136 is a primary winding and the second winding 138 is a secondary winding.
  • the second transformer 134 is an isolation transformer.
  • the second transformer 134 may be configured to operate as a step-up transformer or a step-down transformer depending on direction of flow of power through the power conversion subunit 128.
  • the first bridge circuit 130 is a DC to AC converter and the second bridge circuit 132 is a AC to DC converter.
  • the second bridge circuit 132 is coupled to the DC to DC converter 126 via a corresponding DC link 140.
  • both the first bridge circuit 130 and the second bridge circuit 132 include single converters
  • the first bridge circuit 130 and the second bridge circuit 132 may include multiple converters coupled in series in another embodiment.
  • use of multiple first and second bridge circuits is envisaged.
  • use of a multiple winding transformer is envisioned.
  • the first conversion unit 108, the second conversion unit 1 10, the power conversion subunit 128, and the DC to DC converter 126 include a plurality of switches.
  • each of the first conversion unit 108 and the second conversion unit 110 may include at least a pair of switches of the plurality of switches coupled in series with one another.
  • the first conversion unit 108, the second conversion unit 1 10, the power conversion subunit 128, and the DC to DC converter may be controlled, using a gate control signal provided to the corresponding switches, to provide a desired output to the grid 120.
  • the plurality of switches may include semiconductor switches.
  • the semiconductor switches include an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, a field-effect transistor, an injection enhanced gate transistor, an integrated gate commutated thyristor, or the like.
  • the semiconductor switches include a gallium nitride based switch, a silicon carbide based switch, a gallium arsenide based switch, or the like.
  • the solar array 124 is coupled to a ground terminal 122.
  • a positive terminal, a negative terminal, or a mid-point terminal of the solar array 124 may be coupled to the ground terminal 122.
  • the mid-point terminal has a potential which is about half the value of the potential at the positive and the negative terminal of the solar array 124.
  • the first transformer 118 is coupled to the ground terminal 122.
  • the power conversion subunit 128 is disposed between the solar array 124 and the wind based power generation subsystem 102.
  • the power conversion subunit 128 aids in isolating the solar array 124 from the wind based power generation subsystem 102.
  • both the solar array 124 and the first transformer 118 are coupled to the ground terminal 122, any leakage current between the solar array 124 and the first transformer 1 18 is prevented.
  • the power conversion subunit 128 aids in isolating the solar array 124 from the wind based power generation subsystem 102, use of a common mode filter for minimizing leakage current is prevented.
  • the footprint and cost of the hybrid power generation system 100 is lower than that of a hybrid power generation system employing a common mode filter.
  • the first transformer 118 is shown to be coupled to the ground terminal 122, any circuit element of the wind based power generation subsystem 102 may be connected to the ground terminal 122.
  • the hybrid power generation system 100 of FIG. 1 is a three-phase system, use of a hybrid power generation system having any number of phases is envisioned.
  • FIG. 2 is a diagrammatical representation 200 of one embodiment of a hybrid power generation system, according to aspects of the present specification.
  • the embodiment of FIG.2 represents a hybrid power generation system using modular second conversion units.
  • the hybrid power generation system 200 is shown to have one or more second conversion units 202.
  • the hybrid power generation system 200 includes a wind based power generation subsystem 102 coupled to a DC source based power generation subsystem 104.
  • the wind based power generation subsystem 102 includes a generator 106, a first conversion unit 108 and the one or more second conversion units 202.
  • the first conversion unit 108 and the one or more second conversion units 202 are coupled to one another via a first DC link 112.
  • the generator 106 includes a stator 114 and a rotor 116.
  • the first conversion unit 108 is coupled to the rotor 116.
  • the stator 114 is coupled to the one or more second conversion unit 202 and further, the stator 114 is coupled to the grid (not shown in FIG. 2).
  • three second conversion units 202a, 202b, 202c correspond to a respective single phase. Although the present embodiment represents three phases, it may be noted that number of phases may vary depending on the type of application.
  • Each of the second conversion units 202a, 202b, 202c includes a plurality of power conversion subunits 128.
  • Each of the plurality of power conversion subunits 128 includes a first bridge circuit 130 coupled to a second bridge circuit 132 via a second transformer 134.
  • the first bridge circuit 130 is coupled to a first winding 136 of the second transformer 134 and the second bridge circuit 132 is coupled to a second winding 138 of the second transformer 134.
  • each of the second conversion units 202a, 202b, 202c includes a plurality of second DC to AC converters 203 and a plurality of second DC links 204.
  • each of the power conversion subunits 128 is coupled to a corresponding second DC to AC converter 203 via a corresponding second DC link 204.
  • each of the second DC to AC converters 203 are coupled to each other in a series connection to form an AC phase terminal 206 and a neutral terminal 208 corresponding to each of the second conversion units 202a, 202b, 202c.
  • each of the second conversion units 202a, 202b, 202c includes the corresponding AC phase terminal 206.
  • each of the second conversion units 202a, 202b, 202c includes the corresponding neutral terminal 208.
  • the AC phase terminal 206 of each of the second conversion units 202a, 202b, 202c is coupled to a corresponding phase of the stator bus 114a.
  • the DC source based power generation subsystem 104 includes a DC to DC converter 126, a differential mode filter 210, and a solar array 124.
  • the solar array 124 is coupled to the DC to DC converter 126 via the differential mode filter 210. Further, the DC to DC converter 126 is coupled to the first DC link 112. Accordingly, the DC source based power generation subsystem 104 is coupled to the first DC link 112.
  • each of second conversion units 202a, 202b, 202c include the plurality of power conversion subunits 128, a portion on a first winding side of the second transformer 134 is galvanically isolated from a second winding side of the second transformer 134.
  • a first path 212 and a second path 214 of the hybrid power generation system 200 may be defined. Accordingly, a portion of the hybrid power generation system 200 along the first path 212 is isolated from a portion of the hybrid power generation system 200 along the second path 214.
  • the first DC link 112 is a circuit element of a first path 212 and is coupled to a ground terminal 122.
  • the first transformer (not shown in FIG. 2), which is a circuit element of a second path 214 is coupled to the ground terminal 122. Since the first DC link 112 is the circuit element of the first path 212 and the first transformer is the circuit element of the second path 214, the grounded first DC link 112 is galvanically isolated from the grounded first transformer. Therefore, flow of leakage current in the hybrid power generation system 200 is prevented without using a common mode filter.
  • the solar array 124 instead of grounding the first DC link 112, the solar array 124 may be coupled to the ground terminal 122. In yet another embodiment, the first DC link 112 and the solar array 124 may not be grounded and accordingly, the hybrid power generation system 200 may be a floating system. In such an embodiment, the flow of leakage current may be prevented.
  • the hybrid power generation system 300 includes a wind based power generation subsystem 102 coupled to a DC source based power generation subsystem 104 at a first DC link 112.
  • the wind based power generation subsystem 102 includes a generator 106, a first conversion unit 108, and three second conversion units 202.
  • the first conversion unit 108 is coupled to the three second conversion units 202 via a first DC link 112.
  • Each of the second conversion units 202a, 202b, 202c includes a plurality of power conversion subunits 128.
  • Each of the plurality of power conversion subunits 128 includes a first bridge circuit 130 coupled to a second bridge circuit 132 via a second transformer 134.
  • each of the power conversion subunits 128 is coupled to a corresponding second DC to AC converter 203 via a corresponding second DC link 204.
  • the DC source based power generation subsystem 104 includes a power conversion subunit 128, a DC to DC converter 126, and a solar array 124.
  • the solar array 124 is coupled to the first DC link 112 via the DC to DC converter 126 and the power conversion subunits 128.
  • the power conversion subunit 128 includes a first bridge circuit 130 coupled to a second bridge circuit 132 via a second transformer 134.
  • each of second conversion units 202a, 202b, 202c include a power conversion subunits 128, a portion on a first winding side of the second transformer 134 is galvanically isolated from a second winding side of the second transformer 134.
  • the DC source based power generation subsystem 104 includes a power conversion subunits 128, a portion on a first winding side of the second transformer 134 is galvanically isolated from a second winding side of the second transformer 134.
  • a first, second, and third paths 302, 304, 306 may be defined.
  • the first path 302 includes a portion from the second winding side of the second transformer 134 of each of the second conversion units 202a, 202b, 202c towards a grid side (not shown in FIG. 3). Particularly, the first path 302 includes a plurality of second DC to AC converters 203 and second bridge circuits 132 of each of the second conversion units 202a, 202b, 202c.
  • the second path 304 includes the first bridge circuit 130 of the DC source based power generation subsystem 104, first bridge circuits 130 of each of the second conversion units 202a, 202b, 202c, the first DC link 112, and the generator 106.
  • the third path 306 includes the second bridge circuit 132, the DC to DC converter 126, and the solar array 124 of the DC source based power generation subsystem 104.
  • a portion of the hybrid power generation system 300 along the first path 302 is isolated from a portion of the hybrid power generation system 300 along the second path 304 and a portion of the hybrid power generation system 300 along the third path 306. Therefore, any circuit element in the first path 302 may be grounded together with any circuit element of the second path 304 and the third path 306 to prevent flow of any leakage current. Accordingly, use of a common mode filter may not be required.
  • a mid-point of the first DC link 112 is coupled to a ground terminal 122.
  • the solar array 124 is coupled to the ground terminal 122.
  • the first transformer (not shown in FIG. 3) may be coupled to the ground terminal.
  • the first DC link 112, the solar array 124, and the first transformer are circuit elements corresponding to the first, second, and third paths 302, 304, 306, respectively. Accordingly flow of any leakage current and use of common mode filter to prevent flow of leakage current in the hybrid power generation system 300 is prevented.
  • FIG.4 is a diagrammatical representation 400 of an embodiment of a hybrid power generation system having modular first conversion units. Accordingly, the embodiment of FIG. 4 represents a hybrid power generation system 400 having a plurality of first conversion units 108. Particularly, FIG. 4 represents a portion of FIG. 3. Also, the embodiment of FIG. 4 represents an embodiment of a hybrid power generation system having distributed DC source based power generation subsystems.
  • the hybrid power generation system 400 includes a wind based power generation subsystem 102 and a plurality of DC source based power generation subsystems 104.
  • the wind based power generation subsystem 102 includes a plurality of first conversion units 108 and a second conversion unit 202a.
  • the plurality of first conversion units 108 are coupled to one another and further coupled to the rotor 116 via a rotor bus 116a corresponding to one phase of a plurality of AC phases.
  • each of the plurality of first conversion units 108 are coupled to the rotor (not shown in FIG. 4) via an inductor 404.
  • each of the plurality of first conversion units 108 are coupled to a neutral terminal 402.
  • the second conversion unit 202a includes a plurality of power conversion subunits 128 and a plurality of second DC to AC converters 203.
  • each of the first conversion unit 108 is further coupled to the corresponding power conversion subunit 128 via a corresponding first DC link 112.
  • the second conversion unit 202a includes a plurality of second DC links 204.
  • Each of the power conversion subunit 128 is coupled to a corresponding second DC to AC converter 203 via a second DC link 204.
  • the plurality of second DC to AC converters 203 are coupled to each other in a series connection to form a AC phase terminal 206 and a neutral terminal 208.
  • the second conversion unit 202a includes the AC phase terminal 206 and the neutral terminal 208.
  • each of the DC source based power generation subsystem 104 includes a solar array 124 coupled to the corresponding first DC link 112 via a corresponding DC to DC converter 126, a corresponding differential mode filter 210, and a corresponding common mode filter 406. Accordingly, a plurality of strings of power generation 408, 410, 412 may be formed. Each of the plurality of strings of power generation 408, 410, 412 include one DC source based power generation subsystem 104, a corresponding first conversion units 108, a corresponding power conversion subunit 128, and a corresponding second DC to AC converters 203.
  • Each of the solar array 124 includes a plurality of photovoltaic modules/battery modules.
  • Various photovoltaic modules/ battery modules employed in the hybrid power generation system 400 are distributed among the solar array /battery banks 124 corresponding to each of the plurality of DC source based power generation subsystems 104.
  • the solar array 124 corresponding to each of the plurality of DC source based power generation subsystems 104 may include 25 photovoltaic modules each.
  • the total number of photovoltaic modules is distributed among the plurality of DC source based power generation subsystems 104.
  • each of the plurality of power conversion subunits 128 includes a first bridge circuit 130 coupled to a second bridge circuit 132 via a second transformer 134. Therefore, a portion on a first winding side of the second transformer 134 is galvanically isolated from a second winding side of the second transformer 134. As a result of isolation of the portion on the first winding side of the second transformer 134 from the second winding side of the second transformer 134, a first path 414 and a second path 416 for each of the strings of power generation 408, 410, 412 is defined.
  • the first path 414 of each of the strings of power generation 408, 410, 412 includes the first conversion unit 108, a corresponding first DC link 112, a corresponding DC source based power generation subsystems 104, and a corresponding first bridge circuit 130.
  • the first path 414 includes the generator (not shown in FIG. 4), the rotor bus 116a.
  • the second path 416 of each of the strings of power generation 408, 410, 412 includes a second bridge circuit 132 and a second DC to AC converter 203.
  • a portion of the hybrid power generation system 400 along the first path 414 is isolated from a portion of the hybrid power generation system 400 along the second path 416. Therefore, for each of the strings of power generation 408, 410, 412, any circuit element in the first path 414 may be grounded together with any circuit element of the second path 416 of the corresponding string of power generation without causing a flow of leakage current. Accordingly, use of a common mode filter is avoided.
  • the neutral terminal 402 is coupled to the ground terminal 122 and the solar array 124 is coupled to the ground terminal 122.
  • the neutral terminal 402 and the solar array/ 124 both form a circuit element of the first path 414 and are therefore, not isolated from one another. Therefore, the common mode filter 406 is used in the DC source based power generation subsystem 104 to isolate the grounded neutral terminal 402 from the grounded solar array 124.
  • the neutral terminal 402 is galvanically isolated from the solar array 124. In this embodiment, even if both the neutral terminal 402 and the solar array 124 are grounded, the flow of leakage current is prevented. Accordingly, the use of the common mode filter 406 in each of the DC source based power generation subsystem 104 is avoided. In yet another embodiment, if the neutral terminal is not grounded and is a floating system, the use of the common mode filter 406 in each of the DC source based power generation subsystem 104 may be avoided.
  • each of the plurality of first conversion units 108 are coupled to both the rotor bus 116a and the neutral terminal 402 via corresponding inductors.
  • the use of inductors aids in preventing circulating current in hybrid power generation system 400.
  • the solar array 124 may be grounded along with a grounded neutral terminal 402 without use of a common mode filter and a power conversion subunit, such as the power conversion subunit 128, in the corresponding DC source based power generation subsystems 104.
  • the value of inductance of the inductors may vary based on a mode of operation of the first conversion units 108.
  • the mode of operation of the first conversion units 108 may include an interleaved mode of operation or a non-interleaved mode of operation.
  • interleaved mode of operation refers to a mode of operation in which carrier signals for each of the first conversion units have same frequency and amplitude, but the carrier signals are phase shifted relative to each other over a carrier signal cycle.
  • carrier signal of one first conversion unit may be spaced apart by 360/n degrees with respect to the carrier signal of another first conversion unit, where n is the number of first conversion units.
  • FIG 5 is a diagrammatical representation 500 of an embodiment of a hybrid power generation system having distributed DC source based power generation subsystems.
  • the hybrid power generation system 500 includes one or more DC source based power generation subsystems coupled to corresponding DC links of the one or more second conversion.
  • FIG. 5 is another embodiment of the hybrid power generation system 400 of FIG. 4.
  • the hybrid power generation system 500 includes a wind based power generation subsystem 102 and a plurality of DC source based power generation subsystems 104.
  • the wind based power generation subsystem 102 includes the plurality of first conversion units 108 and a second conversion unit 202a.
  • the second conversion unit 202a includes a plurality of power conversion subunits 128 and a plurality of second DC to AC converters 203.
  • Each of the first conversion units 108 is coupled to the corresponding power conversion subunit 128 of the second conversion unit 202a via a corresponding first DC link 112.
  • Each of the plurality of power conversion subunits 128 is coupled to a corresponding second DC to AC converter 203 via a second DC link 204.
  • each of the DC source based power generation subsystem 104 includes a solar array 124 coupled to a corresponding second DC link 204 via a corresponding DC to DC converter 126 and a corresponding power conversion subunit 128.
  • a plurality of strings of power generation 502, 504, 506 may be formed.
  • each of the plurality of strings of power generation 502, 504, 506 may include a DC source based power generation subsystem 104, a corresponding first conversion unit 108, a corresponding power conversion subunit 128 of the second conversion unit 202a, and a corresponding second DC to AC converter 203 of the second conversion unit 202a.
  • each of the plurality of power conversion subunits 128 includes a first bridge circuit 130 coupled to a second bridge circuit 132 via a second transformer 134.
  • a portion on a first winding side of the second transformer 134 is galvanically isolated from a second winding side of the second transformer 134.
  • a first path 508, a second path 510, and a third path 512 of the hybrid power generation system 500 may be defined.
  • the first, second, and third paths 508, 510, and 512 are isolated from one another.
  • the first path 508 of each of the plurality of strings of power generation 502, 504, 506 includes one first conversion unit 108, a corresponding first DC link 112, and a corresponding first bridge circuit 130 of the second conversion unit 202a.
  • the second path 510 of each of the plurality of strings of power generation 502, 504, 506 includes the second bridge circuit 132 of the second conversion unit 202a, a corresponding second DC to AC converter 203 and a second bridge circuit 132 of a corresponding DC source based power generation subsystem 104.
  • the third path 512 of each of the plurality of strings of power generation 502, 504, 506 includes one solar array 124, a corresponding DC to DC converter 126, and a corresponding first bridge circuit 130 of a DC source based power generation subsystem 104.
  • any circuit element in the first path 508 may be grounded together with any other circuit element of the second path 510 and the third path 512 of the corresponding string of power generation without using a common mode filter.
  • the neutral terminal 402 is coupled to the ground terminal 122 and the solar array 124 is also coupled to the ground terminal 122.
  • the neutral terminal 402 is a circuit element of the first path 508 and the solar array 124 is a circuit element of the third path 512 and are isolated from one another to prevent flow of a leakage current in the hybrid power generation system 500. Therefore, a common mode filter need not be employed in the hybrid power generation system 500 and particularly, in the DC source based power generation subsystems 104.
  • FIG. 4 and 5 represent a single-phase hybrid power generation system, based on the type of application, the number of phases of the hybrid power generation system may vary.
  • use of the power conversion subunit 128 aids in isolating two portions of the hybrid power generation system.
  • the DC source based power generation subsystems are isolated from the wind based power generation subsystem.
  • the use of the power conversion subunit 128 aids in preventing flow of leakage current in the hybrid power generation system.
  • use of a common mode filter is avoided. Any power generation system which do not employ a common mode filter have a better footprint, higher reliability, and cost saving when compared to the hybrid power generation systems employing the common mode filter.
  • presence of multiple DC links in the hybrid power generation system aids in distribution of the energy sources, such as photovoltaic modules and battery modules. Distribution of the energy sources in the hybrid power generation system aids in enhanced maximum power point tracking in the case of photovoltaic modules and enhanced state of charge management in the case of battery modules.
  • the hybrid power generation systems of the present disclosure may find application in wind solar hybrid power generation system and any other system employing the wind based power generation subsystem.
  • the wind based power generation subsystem may be either doubly fed induction generator based or full power conversion based wind turbines.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Eletrric Generators (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

L'invention concerne un système de génération d'énergie hybride. Le système comprend un premier sous-système de génération d'énergie comprenant un moteur entraînant un générateur comprenant un rotor et un stator, une ou plusieurs premières unités de conversion couplées à au moins l'un du rotor et du stator, une première liaison en courant continu (c.c.), et une ou plusieurs secondes unités de conversion couplées à une ou plusieurs premières unités de conversion correspondantes par l'intermédiaire de la première liaison en courant continu. Le système comprend un ou plusieurs seconds sous-systèmes de génération d'énergie couplés au premier sous-système de génération d'énergie et une ou plusieurs sous-unités de conversion d'énergie comprenant un ou plusieurs premiers circuits de pont couplés à un ou plusieurs seconds circuits de pont correspondants par l'intermédiaire d'un ou de plusieurs transformateurs, au moins l'un du ou des seconds sous-systèmes de génération d'énergie et du premier sous-système de génération d'énergie comprenant la ou les sous-unités de conversion d'énergie.
EP18838548.8A 2017-07-28 2018-07-18 Système de génération d'énergie hybride et son procédé associé Withdrawn EP3658769A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/663,603 US10641245B2 (en) 2017-01-05 2017-07-28 Hybrid power generation system and an associated method thereof
PCT/US2018/042716 WO2019023023A1 (fr) 2017-07-28 2018-07-18 Système de génération d'énergie hybride et son procédé associé

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EP3658769A1 true EP3658769A1 (fr) 2020-06-03
EP3658769A4 EP3658769A4 (fr) 2021-04-21

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EP3658769A4 (fr) 2021-04-21
CN111108290A (zh) 2020-05-05
WO2019023023A1 (fr) 2019-01-31

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