# US 2021/0242686 A1 · Integrated hybrid power plants for off-grid systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242686 A1 - Document ID: US20210242686A1 - Status: Published application - Kind: A1 - Application number: 17/052,710 - Filed: 2018-05-03 - Published: 2021-08-05 - Earliest claimed: 2018-05-03 - Assignees: Vestas Wind Systems A/S - Applicants: Vestas Wind Systems A/S - Inventors: Lennart PETERSEN - Web page: https://patentgrep.com/patent/US20210242686A1 ## CPC - H02J 3/381: {Dispersed generators} - H02J 3/32: using batteries or super capacitors with converting means - H02J 2101/10: Dispersed power generation using fossil fuels, e.g. diesel generators - H02J 2101/24: Photovoltaics - H02J 2101/28: Wind energy - H02J 2101/40: Hybrid power plants, i.e. a plurality of different generation technologies being operated at one power plant - H02J 2103/30: Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks - Y02E 10/56: Power conversion systems, e.g. maximum power point trackers - Y02E 40/70: Smart grids as climate change mitigation technology in the energy generation sector - Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation - Y02P 80/20: using renewable energy - Y04S 10/50: Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications - Y04S 40/20: Information technology specific aspects, e.g. CAD, simulation, modelling, system security - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS ## Abstract The present invention relates to a hybrid power plant comprising a plurality of power units being operatively connected to an internal power grid, wherein the power ratings of the plurality of power units of the hybrid power plant are determined in accordance with active and reactive power losses in the internal power grid in order to obtain optimal and cost efficient operation of the hybrid power plant. The present invention also relates to a method for determining the power ratings of a plurality of power units being operatively connected to an internal power grid of such a hybrid power plant. ## Claims ### Claim 1 A hybrid power plant, comprising: a plurality of power units being operatively connected to an internal power grid, wherein respective power ratings of the plurality of power units of the hybrid power plant are determined in accordance with active and reactive power losses in the internal power grid in order to obtain optimal operation of the hybrid power plant. ### Claim 2 (depends on 1) A hybrid power plant according to claim 1, wherein the internal power grid comprises a first voltage bus and a second voltage bus. ### Claim 3 (depends on 2) A hybrid power plant according to claim 2, wherein the first voltage bus comprises a low-voltage bus, and wherein the second voltage bus comprises a medium-voltage bus, said medium-voltage bus being operatively connected to the low-voltage bus via one or more transformer units. ### Claim 4 (depends on 3) A hybrid power plant according to claim 3, wherein the plurality of power units are selected from the group consisting of: wind turbine generators, photovoltaic systems, energy storage systems and engine driven generators. ### Claim 5 (depends on 4) A hybrid power plant according to claim 4, wherein one or more wind turbine generators and/or one or more photovoltaic systems are operationally connected to one or more medium-voltage buses via respective transformer units. ### Claim 6 (depends on 4) A hybrid power plant according to claim 4, wherein one or more energy storage systems and/or one or more engine driven generators are operationally connected to one or more low-voltage buses and/or one or more medium-voltage buses. ### Claim 7 (depends on 1) A hybrid power plant according to claim 1, wherein the total power rating of the plurality of power units is below 5 MW. ### Claim 8 A method for determining the power ratings of a plurality of power units being operatively connected to an internal power grid of a hybrid power plant, the method, comprising: determining respective power ratings of the plurality of power unit in accordance with active and reactive power losses in the internal power grid in order to obtain optimal operation of the hybrid power plant. ### Claim 9 (depends on 8) A method according to claim 8, wherein the internal power grid comprises a first voltage bus and a second voltage bus. ### Claim 10 (depends on 9) A method according to claim 9, wherein the first voltage bus comprises a low-voltage bus, and wherein the second voltage bus comprises a medium-voltage bus, said medium-voltage bus being operatively connected to the low-voltage bus via one or more transformer units. ### Claim 11 (depends on 10) A method according to claim 10, wherein the plurality of power units are selected from the group consisting of: wind turbine generators, photovoltaic systems, energy storage systems and engine driven generators. ### Claim 12 (depends on 11) A method according to claim 11, wherein one or more wind turbine generators and/or one or more photovoltaic systems are operationally connected to one or more medium-voltage buses via respective transformer units. ### Claim 13 (depends on 11) A method according to claim 11, wherein one or more energy storage systems and/or one or more engine driven generators are operationally connected to one or more low-voltage buses and/or one or more medium-voltage buses. ### Claim 14 (depends on 8) A method according to claim 8, wherein the determined total power rating of the plurality of power units is below 5 MW, such as below 4 MW, such as below 3 MW, such as below 2 MW, such as below 1.5 MW, such as below 1 MW. ### Claim 15 (depends on 7) A hybrid power plant according to claim 7, wherein the total power rating of the plurality of power units is below 2 MW. ### Claim 16 A hybrid power plant, comprising: a plurality of power units being operatively connected to an internal power grid, wherein respective power ratings of the plurality of power units of the hybrid power plant are determined in accordance with active and reactive power losses in the internal power grid in order to obtain optimal operation of the hybrid power plant; wherein the internal power grid comprises a first voltage bus and a second voltage bus; wherein the first voltage bus is configured for a lower voltage than the second voltage bus, the second voltage bus being operatively connected to the first voltage bus via one or more transformer units, wherein the total power rating of the plurality of power units is below 5 MW. ### Claim 17 (depends on 16) A hybrid power plant according to claim 16, wherein the plurality of power units are selected from the group consisting of: one or more energy storage systems and one or more engine driven generators; and wherein at least one of the one or more energy storage systems or the one or more engine driven generators are operationally connected to the second voltage bus. ### Claim 18 (depends on 16) A hybrid power plant according to claim 16, wherein the plurality of power units are selected from the group consisting of: wind turbine generators and photovoltaic systems. ### Claim 19 (depends on 18) A hybrid power plant according to claim 18, wherein at least one of one or more wind turbine generators or one or more photovoltaic systems are operationally connected to the second voltage bus via respective transformer units. ### Claim 20 (depends on 19) A hybrid power plant according to claim 19, wherein the total power rating of the plurality of power units is below 2 MW.