# US 2013/0278308 A1 · Methods and systems for controlling a power converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278308 A1 - Document ID: US20130278308A1 - Status: Published application - Kind: A1 - Application number: 13/454,647 - Filed: 2012-04-24 - Published: 2013-10-24 - Earliest claimed: 2012-04-24 - Assignees: General Electric Company - Inventors: Einar Vaughn Larsen - Web page: https://patentgrep.com/patent/US20130278308A1 ## CPC - H02P 9/00: Arrangements for controlling electric generators for the purpose of obtaining a desired output - F03D 7/0284: {in relation to the state of the electric grid} - H02P 9/10: Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load - H02P 21/05: specially adapted for damping motor oscillations, e.g. for reducing hunting - Y02E 10/72: Wind turbines with rotation axis in wind direction - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - F03D: WIND MOTORS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A stabilizer system associated with a power converter controller is described. The stabilizer system includes a regulator stabilizer configured to receive a phase locked loop (PLL) error signal and to generate a regulator stabilization signal based at least partially on the PLL error signal. The stabilizer system also includes a regulator coupled to the regulator stabilizer and a converter interface controller. The regulator is configured to receive the regulator stabilization signal, generate a first command signal, based at least partially on the regulator stabilization signal, that reduces system oscillations, and transmit the first command signal to the converter interface controller. ## Claims ### Claim 1 A stabilizer system associated with a power converter controller, the stabilizer system comprising: a regulator stabilizer configured to receive a phase locked loop (PLL) error signal and to generate a regulator stabilization signal based at least partially on the PLL error signal; and, a regulator coupled to said regulator stabilizer and a converter interface controller, said regulator configured to: receive the regulator stabilization signal; generate a first command signal, based at least partially on the regulator stabilization signal, that reduces system oscillations; and, transmit the first command signal to the converter interface controller. ### Claim 2 (depends on 1) A system in accordance with claim 1, wherein said regulator stabilizer is further configured to apply a predefined transfer function to the PLL error signal, wherein the regulator stabilization signal is an output of the predefined transfer function. ### Claim 3 (depends on 2) A system in accordance with claim 2, wherein the predefined transfer function isolates a frequency range within the PLL error signal that includes an indication of system oscillations and applies a gain to positively dampen the system oscillations. ### Claim 4 (depends on 1) A system in accordance with claim 1, wherein oscillations within the PLL error signal correspond to system oscillations including at least one of oscillations of a terminal voltage at an output of a power converter associated with the power converter controller and electrical power output by the power converter, and wherein the system oscillations correspond to system instability. ### Claim 5 (depends on 4) A system in accordance with claim 4, wherein the first command signal, when provided to the converter interface controller and used to control operation of the power converter, dampens the system oscillations. ### Claim 6 (depends on 1) A system in accordance with claim 1, wherein said regulator comprises at least one of a voltage regulator and a power regulator, and wherein the first command signal comprises at least one of a reactive current command signal generated by said voltage regulator and a real current command signal generated by said power regulator. ### Claim 7 (depends on 6) A system in accordance with claim 6, wherein said voltage regulator is further configured to receive a voltage feedback signal, and wherein said voltage regulator generates the reactive current command signal based on the regulator stabilization signal and the voltage feedback signal. ### Claim 8 A converter controller for controlling operation of a power conversion assembly, said converter controller comprising: a stabilizer system configured to: receive a phase locked loop (PLL) error signal; and, generate a first command signal, based at least partially on the PLL error signal, that reduces system oscillations; and, a converter interface controller communicatively coupled to said stabilizer system and configured to generate control signals based at least partially on the first command signal and transmit the control signals to the power conversion assembly. ### Claim 9 (depends on 8) A converter controller in accordance with claim 8, wherein the PLL error signal is indicative of system oscillations including at least one of oscillations of terminal voltage and/or electrical power output by the power conversion assembly, and wherein the system oscillations correspond to system instability. ### Claim 10 (depends on 8) A converter controller in accordance with claim 8, wherein said stabilizer system comprises: a regulator stabilizer configured to receive the PLL error signal and to generate a regulator stabilization signal; and, a regulator coupled to said regulator stabilizer and configured to receive the regulator stabilization signal, generate the first command signal, based at least partially on the regulator stabilization signal, and provide the first command signal to said converter interface controller. ### Claim 11 (depends on 10) A converter controller in accordance with claim 10, wherein said regulator is further configured to receive a terminal voltage feedback signal, and wherein said regulator generates the first command signal based on the regulator stabilization signal and the terminal voltage feedback signal. ### Claim 12 (depends on 10) A converter controller in accordance with claim 10, wherein said regulator comprises at least one of a voltage regulator and a power regulator, and wherein the first command signal comprises at least one of a reactive current command signal generated by said voltage regulator and a real current command signal generated by said power regulator. ### Claim 13 (depends on 10) A converter controller in accordance with claim 10, wherein said regulator stabilizer is configured to apply a predefined transfer function to the PLL error signal, wherein the regulator stabilization signal is an output of the predefined transfer function, and wherein the predefined transfer function isolates a frequency range within the PLL error signal that includes an indication of system oscillations and applies a gain to positively dampen the system oscillations. ### Claim 14 A method for controlling a power generation and delivery system that includes an electrical generator, a power converter, and a controller, said method comprising: monitoring an output parameter of the power generation and delivery system indicative of system oscillations; generating, using the controller, a command signal based at least partially on the output parameter; and, controlling operation of the power converter based at least partially on the command signal to reduce system oscillations. ### Claim 15 (depends on 14) A method in accordance with claim 14, wherein monitoring an output parameter comprises receiving, at the controller, at least one of a phase locked loop (PLL) error signal and a terminal voltage feedback signal. ### Claim 16 (depends on 15) A method in accordance with claim 15, wherein generating the command signal comprises: applying a transfer function to the PLL error signal to generate a regulator stabilization signal; and, providing the regulator stabilization signal to a regulator configured to generate the command signal based at least partially on the regulator stabilization signal. ### Claim 17 (depends on 16) A method in accordance with claim 16, wherein providing the regulator stabilization signal to a regulator comprises providing the regulator stabilization signal to a voltage regulator configured to generate a reactive current command signal based at least partially on the regulator stabilization signal. ### Claim 18 (depends on 17) A method in accordance with claim 17, wherein generating the reactive current command signal comprises summing the regulator stabilization signal, a reference voltage signal, and an inverse of the terminal voltage feedback signal. ### Claim 19 (depends on 16) A method in accordance with claim 16, wherein providing the regulator stabilization signal to a regulator comprises providing the regulator stabilization signal to a power regulator configured to generate a real current command signal based at least partially on the regulator stabilization signal. ### Claim 20 (depends on 16) A method in accordance with claim 16, wherein applying the transfer function comprises applying a predefined transfer function to the PLL error signal that isolates a frequency range within the PLL error signal that includes an indication of system oscillations, wherein the predefined transfer function includes a predefined gain for positively dampening system oscillations.