# US 9,436,200 B2 · Use of distributed generator (DG) inverters as statcoms for decreasing line losses > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,436,200 B2 - Document ID: US9436200B2 - Status: Granted - Kind: B2 - Application number: 13/836,276 - Filed: 2013-03-15 - Published: 2014-02-13 - Granted: 2016-09-06 - Earliest claimed: 2012-08-09 - Applicants: Rajiv Kumar Varma - Inventors: Rajiv Kumar Varma - Web page: https://patentgrep.com/patent/US9436200B2 ## CPC - G05F 1/66: Regulating electric power - G05B 19/0426: {Programming the control sequence} - G05B 2219/40458: Grid adaptive optimization - G05B 2219/50083: Power loss, measures again loss of power - Y02E 10/56: Power conversion systems, e.g. maximum power point trackers - Y02E 10/76: Power conversion electric or electronic aspects - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The invention provides systems, methods, and devices relating to the provision of system-wide coordinated control voltage regulation support in power transmission and distribution networks using multiple inverter based power generation facilities, which are coupled to the power transmission and distribution networks for minimizing transmission and distribution line losses. The invention uses a novel control method of inverter based Distributed Generators as Static Synchronous Compensator (STATCOM) in a way that provides a dynamic voltage regulation/control with the inverter capacity remaining after real power generation, thereby decreasing system line losses. ## Claims ### Claim 1 A method for reducing line losses in a power transmission and distribution network, the method comprising: determining specific voltage setpoints for at least one inverter based power generation facility operatively coupled to said network based on an optimal load flow study performed at an energy control center, said specific voltage setpoints being voltages that minimize line losses on said network; communicating said specific voltage setpoints from said energy control center to said at least one inverter based power generation facility operatively coupled to said network via at least one bidirectional communication channel; and repeating said determining and said communicating at a set time interval determined by said energy control center to ensure that said line losses are continuously minimized, wherein an inverter of said at least one inverter based power generation facility operates as a static synchronous compensator (STATCOM), said inverter injecting or absorbing controlled reactive power with said network to regulate a voltage at a point of common coupling of said at least one inverter based power generation facility towards said specific voltage setpoint, wherein said energy control center coordinates said voltage regulation on said network; wherein said controlled reactive power provided to said network is based on an inverter capacity for said at least one inverter based power generation facility available after real power generation, and wherein a normal real power production function of the at least one inverter based power generation facility continues while said inverter injects or absorbs said controlled reactive power with said network. ### Claim 2 (depends on 1) A method according to claim 1, wherein said at least one power generation facility is a solar farm. ### Claim 3 (depends on 1) A method according to claim 1, wherein said at least one power generation facility is a wind farm. ### Claim 4 (depends on 1) A method according to claim 1, wherein said at least one power generation facility is fitted with an auxiliary voltage controller for minimizing line losses in the said power network. ### Claim 5 (depends on 1) A method according to claim 1, further including the step of coordinating voltage control support across said power transmission and distribution network such that different inverter-based power generation facilities operate as STATCOMs to provide specific levels of voltage control at their specific locations in said power network. ### Claim 6 Non-transitory computer-readable media having encoded thereon computer readable and computer executable instructions which, when executed, implements a method for reducing line losses in a power transmission and distribution network, the method comprising: determining a specific set of voltage setpoints for at least one inverter based power generation facility operatively coupled to said network based on an optimal load flow study performed at an energy control center, said specific voltage setpoints being voltages that minimize line losses on said network; communicating said specific voltage setpoints from said energy control center to said at least one inverter based power generation facility operatively coupled to said network via at least one bidirectional communication channel; and repeating said determining and said communicating at a set time interval determined by said energy control center to ensure that said line losses are continuously minimized, wherein an inverter of said at least one inverter based power generation facility operates as a static synchronous compensator (STATCOM), said inverter injecting or absorbing controlled reactive power with said network to regulate a voltage at a point of common coupling of said at least one inverter based power generation facility towards said specific voltage setpoint, wherein said energy control center coordinates said voltage regulation on said network; wherein said controlled reactive power provided to said network is based on an inverter capacity for said at least one power generation facility available after real power generation, and wherein a normal real power production function of the at least one inverter based power generation facility continues while said inverter injects or absorbs said controlled reactive power with said network. ### Claim 7 A method for reducing line losses in a power transmission and distribution network, the method comprising: a) at a specific inverter based power generation facility, receiving an indication that voltage control support is required for line loss minimization; b) determining a specific voltage for a specific location on said specific inverter based power generation facility operatively coupled to said network, said specific voltage being determined based on an optimal load flow study performed at an energy control center, said specific voltage being a voltage that minimizes line losses on said network; c) regulating a voltage at a point of common coupling for said specific inverter based power generation facility towards said specific voltage through injecting or absorbing controlled reactive power with said network, said controlled reactive power being based on an inverter capacity for said specific inverter based power generation facility available after real power generation, wherein a normal real power production function of said specific inverter based power generation facility continues while injecting or absorbing controlled reactive power with said network; d) repeating steps b) and c) at a set time interval determined by said energy control center to ensure that said line losses are continuously minimized, wherein an inverter of said specific inverter based power generation facility operates as a static synchronous compensator (STATCOM) to insect or absorb controlled reactive power with said network in step c); wherein said energy control center coordinates said voltage regulation on said network. ### Claim 8 (depends on 7) A method according to claim 7, wherein said power generation facility is a solar farm. ### Claim 9 (depends on 7) A method according to claim 7, wherein said power generation facility is a wind farm. ### Claim 10 (depends on 7) The method according to claim 7, wherein step c) comprises: c1) determining said voltage at said point of common coupling; c2) determining a difference between said specific voltage and said voltage at said point of common coupling; c3) regulating said voltage at said point of common coupling for said power generation facility to reduce said difference determined in step c2) through said injecting or absorbing of controlled reactive power with said network. ### Claim 11 Non-transitory computer readable media having encoded thereon computer readable and computer executable instructions which, when executed, implements a method for reducing line losses in a power transmission and distribution network, the method comprising: a) at a specific inverter based power generation facility, receiving an indication that voltage control support is required for line loss minimization; b) determining a specific voltage for a specific location on said specific inverter based power generation facility operatively coupled to said network, said specific voltage being determined based on an optimal load flow study performed at an energy control center, said specific voltage being a voltage that minimizes line losses on said network; c) regulating a voltage at a point of common coupling for said specific inverter based power generation facility towards said specific voltage through injecting or absorbing controlled reactive power with said network, said controlled reactive power being based on an inverter capacity for said specific inverter based power generation facility available after real power generation, wherein a normal real power production function of said specific inverter based power generation facility continues while said inverter infects or absorbs controlled reactive power with said network; d) repeating steps b) and c) at a set time interval determined by said energy control center to ensure that said line losses are continuously minimized, wherein the inverter of said specific inverter based power generation facility operates as a static synchronous compensator (STATCOM) to insect or absorb controlled reactive power with said network in step c); wherein said energy control center coordinates said voltage regulation on said network.