# US 2018/0323620 A1 · Electrical Power Systems and Methods Using Distortion Filters > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323620 A1 - Document ID: US20180323620A1 - Status: Published application - Kind: A1 - Application number: 15/588,902 - Filed: 2017-05-08 - Published: 2018-11-08 - Earliest claimed: 2017-05-08 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Govardhan Ganireddy; Saurabh Shukla; Rajni Burra; Robert Gregory Wagoner; Anthony Michael Klodowski; Yashomani Kolhatkar - Web page: https://patentgrep.com/patent/US20180323620A1 ## CPC - H02M 1/12: Arrangements for reducing harmonics from AC input or output - H02J 3/01: Arrangements for reducing harmonics or ripples - H02J 3/38: Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel - H02J 3/381: {Dispersed generators} - H02M 5/04: by static converters (controlling transformers, reactors or choke coils, e.g. by tap changing H02P13/00) - H02M 5/42: by static converters - H02J 2101/28: Wind energy - Y02E 40/40: Arrangements for reducing harmonics - 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 An electrical power system includes a cluster of electrical power subsystems, each of the electrical power subsystems including a power converter electrically coupled to a generator having a generator rotor and a generator stator. Each of the electrical power subsystems defines a stator power path and a converter power path for providing power to the power grid. The converter power path includes a partial power transformer. The electrical power system further includes a subsystem breaker configured with each of the electrical power subsystems, and a cluster transformer for connecting each cluster of electrical power subsystems to the power grid. The electrical power system further includes a cluster power path extending between each subsystem breaker and the cluster transformer, and a distortion filter electrically coupled to the cluster transformer. The distortion filter reduces harmonics in current flowing from the electrical power subsystems to the cluster transformer. ## Claims ### Claim 1 An electrical power system connectable to a power grid, comprising: a cluster of electrical power subsystems, each of the electrical power subsystems comprising a power converter electrically coupled to a generator having a generator rotor and a generator stator, each of the electrical power subsystems defining a stator power path and a converter power path for providing power to the power grid, the converter power path comprising a partial power transformer; a subsystem breaker configured with each of the electrical power subsystems; a cluster transformer for connecting each cluster of electrical power subsystems to the power grid; a cluster power path extending between each subsystem breaker and the cluster transformer; and a distortion filter electrically coupled to the cluster transformer, wherein the distortion filter reduces harmonics in current flowing from the electrical power subsystems to the cluster transformer. ### Claim 2 (depends on 1) The electrical power system of claim 1, wherein the distortion filter is electrically coupled to the cluster transformer at a location closer to the cluster transformer than to the subsystem breaker of any of the electrical power subsystems in the cluster. ### Claim 3 (depends on 1) The electrical power system of claim 1, wherein the distortion filter is a passive filter. ### Claim 4 (depends on 1) The electrical power system of claim 1, wherein the distortion filter is an active filter. ### Claim 5 (depends on 1) The electrical power system of claim 1, wherein the cluster transformer comprises a two-winding transformer. ### Claim 6 (depends on 5) The electrical power system of claim 5, wherein the distortion filter is directly electrically coupled to the cluster power path. ### Claim 7 (depends on 5) The electrical power system of claim 5, wherein the distortion filter is electrically coupled to the cluster power path by a filter transformer, the filter transformer comprising a two-winding transformer. ### Claim 8 (depends on 1) The electrical power system of claim 1, wherein the cluster transformer comprises a three-winding transformer and the distortion filter is electrically coupled to a winding of the three-winding transformer. ### Claim 9 (depends on 1) The electrical power system of claim 1, further comprising: a filter switch configured with the distortion filter; and a controller communicatively coupled to each of the electrical power subsystems and the distortion filter, the controller configured to determine a indicator level in the cluster power path and, when the indicator level exceeds a predetermined threshold, activating the filter switch to activate the distortion filter. ### Claim 10 A method for operating an electrical power system, the electrical power system having a cluster of electrical power subsystems with a cluster transformer connecting the cluster of electrical power subsystems to a power grid, each of the electrical power subsystems having a power converter electrically coupled to a generator with a generator rotor and a generator stator, each of the electrical power subsystems defining a stator power path and a converter power path for providing power to the power grid, the converter power path including a partial power transformer, the method comprising: determining a indicator level of a current flowing from the cluster of electrical power subsystems to the cluster transformer; comparing the indicator level to a predetermined threshold; and when the indicator level exceeds the predetermined threshold, activating a distortion filter, the distortion filter electrically coupled to the cluster transformer. ### Claim 11 (depends on 10) The method of claim 10, wherein the partial power transformer comprises a two-winding transformer. ### Claim 12 (depends on 10) The method of claim 10, wherein the distortion filter is electrically coupled to the cluster transformer at a location closer to the cluster transformer than to the subsystem breaker of any of the electrical power subsystems in the cluster. ### Claim 13 (depends on 10) The method of claim 10, wherein the distortion filter is a passive filter. ### Claim 14 (depends on 10) The method of claim 10, wherein the distortion filter is an active filter. ### Claim 15 (depends on 10) The method of claim 10, wherein the cluster transformer comprises a two-winding transformer. ### Claim 16 (depends on 15) The method of claim 15, wherein the distortion filter is directly electrically coupled to the cluster power path. ### Claim 17 (depends on 15) The method of claim 15, wherein the distortion filter is electrically coupled to the cluster power path by a filter transformer, the filter transformer comprising a two-winding transformer. ### Claim 18 (depends on 10) The method of claim 10, wherein the cluster transformer comprises a three-winding transformer and the distortion filter is electrically coupled to a winding of the three-winding transformer.