# US 2014/0153302 A1 · Automatic ac bus voltage regulation for power distribution grids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153302 A1 - Document ID: US20140153302A1 - Status: Published application - Kind: A1 - Application number: 14/172,419 - Filed: 2014-02-04 - Published: 2014-06-05 - Earliest claimed: 2010-10-27 - Assignees: Perfect Galaxy International Limited - Applicants: Perfect Galaxy International Limited - Inventors: Colin David Schauder; Leo F. Casey - Web page: https://patentgrep.com/patent/US20140153302A1 ## CPC - H02M 1/42: Circuits or arrangements for compensating for or adjusting power factor in converters or inverters - H02J 3/16: by adjustment of reactive power - Y02E 40/30: Reactive power compensation - 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 (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - 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 ## Abstract A system for automatically regulating voltage on a distribution-level AC bus having an actual voltage and a nominal voltage includes an electronic power converter connected to the distribution-level AC bus. The system generates a feedback signal representative of the actual voltage of the distribution-level AC bus and produces an input control signal in response to the feedback signal. The input control signal is representative of a commanded level of reactive power. The electronic power converter is responsive to the input control signal to deliver a commanded reactive power output to the distribution-level AC bus, and the commanded reactive power output pushes the actual voltage towards the nominal voltage. ## Claims ### Claim 1 A system for automatically regulating voltage comprising: an AC bus voltage controller in communication with a distribution-level AC bus connected to a power distribution grid and having an actual voltage and a nominal voltage, the AC bus voltage controller being configured to generate an input control signal based on a feedback signal representative of said actual voltage of said distribution-level AC bus, a droop signal and a reference signal representative of said nominal voltage, said input control signal being representative of a commanded level of reactive power; and an electronic power converter connected to said distribution-level AC bus, wherein said electronic power converter is responsive to said input control signal to deliver a commanded reactive power output to said distribution level AC bus and said commanded reactive power output pushes said actual voltage towards said nominal voltage. ### Claim 2 (depends on 1) The system of claim 1 further comprising one or more sensors for measuring a 3-phase AC bus voltage of said distribution-level AC bus. ### Claim 3 (depends on 1) The system of claim 1 wherein said electronic power converter comprises an inverter and a control system that controls said inverter in response to said input control signal. ### Claim 4 (depends on 1) The system of claim 1 wherein said commanded reactive power output has the correct polarity to move said actual voltage towards said nominal voltage and its magnitude is in proportion to the deviation of said actual voltage from said nominal voltage. ### Claim 5 (depends on 1) The system of claim 1 wherein said automatic AC bus voltage controller has a response time on the order of one cycle or faster. ### Claim 6 A system for automatically regulating voltage comprising: an AC bus voltage controller in communication with a distribution-level AC bus connected to a power distribution grid and having an actual voltage and a nominal voltage, the AC bus voltage controller being configured to generate an input control signal based on the actual voltage and the nominal voltage of the distribution-level AC bus, the input signal being representative of a commanded level of reactive power; an electronic power converter in communication with said distribution-level AC bus, wherein said electronic power converter is responsive to said input control signal to deliver a commanded reactive power output to said distribution level AC bus and said commanded reactive power output pushes said actual voltage towards said nominal voltage; and an apparent power management system in communication with the power converter and configured to manage an apparent power of said electronic power converter. ### Claim 7 (depends on 6) The system of claim 6 wherein the AC bus voltage controller generates said input control signal based on a feedback signal representative of said actual voltage of said distribution-level AC bus, a droop signal and a reference signal representative of said nominal voltage. ### Claim 8 (depends on 6) The system of claim 6 further comprising one or more sensors for measuring a 3-phase AC bus voltage of said distribution-level AC bus. ### Claim 9 (depends on 6) The system of claim 6 wherein said electronic power converter comprises an inverter and a control system that controls said inverter in response to said input control signal. ### Claim 10 (depends on 6) The system of claim 6 wherein said commanded reactive power output is of the correct polarity to move said actual voltage towards said nominal voltage and its magnitude is in proportion to the deviation of said actual voltage from said nominal voltage. ### Claim 11 (depends on 6) The system of claim 6 wherein said automatic AC bus voltage controller has a response time on the order of one cycle or faster. ### Claim 12 A system for automatically regulating voltage comprising: an AC bus voltage controller in communication with a distribution-level AC bus connected to a power distribution grid and having an actual voltage and a nominal voltage, the AC bus voltage controller being configured to generate an input control signal based on the actual voltage and the nominal voltage of the distribution-level AC bus, the input signal being representative of a commanded level of reactive power; an electronic power converter in communication with said distribution-level AC bus, wherein said electronic power converter is responsive to said input control signal to deliver a commanded reactive power output to said distribution level AC bus and said commanded reactive power output pushes said actual voltage towards said nominal voltage; and a real power feed-forward system configured to lower said commanded reactive power output in proportion to a measured instantaneous real power output. ### Claim 13 (depends on 12) The system of claim 12 wherein the AC bus voltage controller generates said input control signal based on a feedback signal representative of said actual voltage of said distribution-level AC bus, a droop signal and a reference signal representative of said nominal voltage. ### Claim 14 (depends on 12) The system of claim 12 further comprising an apparent power management system in communication with the power converter and configured to manage an apparent power of said electronic power converter. ### Claim 15 (depends on 12) The system of claim 12 further comprising one or more sensors for measuring a 3-phase AC bus voltage of said distribution-level AC bus. ### Claim 16 (depends on 12) The system of claim 12 wherein said electronic power converter comprises an inverter and a control system that controls said inverter in response to said input control signal. ### Claim 17 (depends on 12) The system of claim 12 wherein said commanded reactive power output is of the correct polarity to move said actual voltage towards said nominal voltage and its magnitude is in proportion to the deviation of said actual voltage from said nominal voltage. ### Claim 18 (depends on 12) The system of claim 12 wherein said automatic AC bus voltage controller has a response time on the order of one cycle or faster.