# US 12,191,666 B2 · Systems and methods for power system stabilization and oscillation damping control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,666 B2 - Document ID: US12191666B2 - Status: Granted - Kind: B2 - Application number: 17/602,143 - Filed: 2020-04-17 - Published: 2022-05-12 - Granted: 2025-01-07 - Earliest claimed: 2019-04-18 - Assignees: University of Washington - Applicants: University of Washington - Inventors: Daniel S. Kirschen; Payman Arabshahi; Ryan Elliott - Web page: https://patentgrep.com/patent/US12191666B2 ## CPC - H02J 3/00142: {Oscillations concerning frequency} - G05B 13/041: {in which a variable is automatically adjusted to optimise the performance} - H02J 3/00144: {using phasor measuring units [PMU]} - 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 - Y04S 10/22: Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - 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 - 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 Embodiments of the present disclosure provide systems and methods directed to improved power system stabilization and oscillation damping control. In operation, a computing device may receive frequency data from a plurality of sensors distributed within a power system. The computing device may calculate an estimate of a speed of a center of inertia signal based at least on the frequency data. A controller may calculate a control error signal for the power system based at least on the estimated speed of the center of inertia signal. The controller may further calculate an auxiliary output signal based at least on the calculated control error. An actuator may utilize the auxiliary output signal to provide an output configured to improve the stability of the power system. ## Claims ### Claim 1 A system comprising: a computing device configured to receive frequency data from a plurality of sensors within a power system; the computing device further configured to calculate an estimate of a speed of a center of inertia signal for the power system, based at least on the received frequency data; a controller configured to calculate a control error signal for the power system based at least on a difference between a rotor speed and the estimate of the speed of the center of inertia signal; the controller further configured to calculate an auxiliary input signal based at least on the control error signal; and an actuator configured to receive the auxiliary input signal and provide an output configured to improve a stability of the power system. ### Claim 2 (depends on 1) The system of claim 1, wherein calculating the estimate of the speed of the center of inertia signal for the power system is further based at least on a weighted average, wherein each sensor of the plurality of sensors within the power system has a corresponding weight. ### Claim 3 (depends on 2) The system of claim 2, wherein each corresponding weight for each sensor of the plurality of sensors within the power system is an inertia constant, wherein each inertia constant is specific to each corresponding sensor. ### Claim 4 (depends on 1) The system of claim 1, wherein calculating the auxiliary input signal is further based at least on applying a washout filter to the control error signal. ### Claim 5 (depends on 4) The system of claim 4, wherein the washout filter is a highpass filter. ### Claim 6 (depends on 4) The system of claim 4, wherein calculating the auxiliary input signal is further based at least on utilizing a lead-lag compensator, wherein the lead-lag compensator phase-adjusts the control error signal. ### Claim 7 (depends on 1) The system of claim 1, wherein improving the stability of the power system is based at least on the actuator utilizing the received auxiliary input signal to change a field current of the actuator. ### Claim 8 (depends on 1) The system of claim 1, wherein the power system comprises synchronous machinery. ### Claim 9 (depends on 8) The system of claim 8, wherein the controller is configured to calculate the control error signal further based on a speed of the synchronous machinery. ### Claim 10 (depends on 1) The system of claim 1, wherein the power system includes inverter-based resources. ### Claim 11 A method comprising: receiving, at a computing device, frequency data associated with a power system; calculating, by the computing device, an estimate of a speed of a center of inertia signal for the power system, based at least on the received frequency data; calculating, by a controller, a control error signal for the power system based at least on a difference between a rotor speed and the estimate of the speed of the center of inertia signal; calculating, by the controller, an auxiliary input signal based at least on the control error signal; and receiving, by an actuator, the auxiliary input signal and provide an output configured to improve a stability of the power system. ### Claim 12 (depends on 11) The method of claim 11, wherein the frequency data is associated with a plurality of sensors within the power system, and wherein calculating, by the computing device, the estimate of the speed of the center of inertia signal for the power system is further based at least on a weighted average, wherein each sensor of the plurality of sensors in the power system has a corresponding weight. ### Claim 13 (depends on 12) The method of claim 12, wherein each corresponding weight for each sensor of the plurality of sensors is an inertia constant, wherein each inertia constant is specific to each corresponding sensor. ### Claim 14 (depends on 11) The method of claim 11, wherein calculating, by the controller, the auxiliary input signal is further based at least on a combination of applying a washout filter to the control error and utilizing a lead-lag compensator, wherein the lead-lag compensator phase-adjusts the control error. ### Claim 15 (depends on 14) The method of claim 14, wherein the washout filter is a highpass filter. ### Claim 16 (depends on 11) The method of claim 11, wherein the power system comprises at least one of a synchronous machine, inverter-based resource, or a combination thereof. ### Claim 17 (depends on 16) The method of claim 16, wherein said calculating the control error signal is further based on a speed of the synchronous machinery. ### Claim 18 A non-transitory computer readable medium having executable computer-executable instructions stored thereon that, if executed by one or more processors of a computer device, cause the computing device to perform one or more steps comprising: receiving frequency data from a plurality of sensors within a power system; calculating an estimate of a speed of a center of inertia signal for the power system, based at least on the received frequency data; calculating a control error signal for the power system based at least on a difference between a rotor speed and the estimate of the speed of the center of inertia signal; calculating an auxiliary input signal based at least on the control error signal; and receiving the auxiliary input signal and providing an output configured to improve a stability of the power system. ### Claim 19 (depends on 18) The computer readable media of claim 18, wherein calculating the estimate of the speed of the center of inertia signal for the power system is further based at least on a weighted average, wherein each sensor of the plurality of sensors within the power system has a corresponding weight. ### Claim 20 (depends on 18) The computer readable media of claim 18, wherein calculating the auxiliary input signal is further based at least on a combination of applying a washout filter to the control error and utilizing a lead-lag compensator, wherein the lead-lag compensator phase-adjusts the control error.