US 12,424,850 B2
Generator control for oscillation damping
Javier Moriano Martin, Alcalá de Henares Madrid (ES); Mario Rizo Morente, Alcala de Henares (ES); and Mireia Barenys Espadaler, Alcalá de Henares (ES)
Assigned to Siemens Gamesa Renewable Energy Innovation & Technology S. L., Sarriguren (ES)
Appl. No. 18/265,995
Filed by Siemens Gamesa Renewable Energy Innovation & Technology S.L., Sarriguren (ES)
PCT Filed Nov. 25, 2021, PCT No. PCT/EP2021/082940
§ 371(c)(1), (2) Date Jun. 8, 2023,
PCT Pub. No. WO2022/122396, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 20383077 (EP), filed on Dec. 10, 2020.
Prior Publication US 2024/0055860 A1, Feb. 15, 2024
Int. Cl. H02J 3/24 (2006.01); F03D 7/02 (2006.01); F03D 7/04 (2006.01)
CPC H02J 3/241 (2020.01) [F03D 7/0272 (2013.01); F03D 7/044 (2013.01); H02J 2300/28 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A control system for controlling the operation of a doubly fed induction generator, DFIG, of an electrical power system, wherein the electrical power system is configured to provide electrical power to a power grid and comprises a rotor side converter coupled to a rotor of the DFIG to control operation of the DFIG, the control system being coupled to the rotor side converter to control the rotor side converter, wherein the control system comprises:
an outer controller that is configured to generate a reference value for a control variable in accordance with which the operation of the DFIG is to be controlled,
an inner controller that is configured to provide an inner control loop and to receive from the outer controller the reference value for the control variable, wherein the inner controller is configured to provide feedback control of the rotor side converter so as to operate the DFIG at the reference value,
wherein the inner controller is a state feedback controller that is configured to obtain at least two states of the power system or the grid that are different from the control variable,
wherein the state feedback controller is configured to control the rotor side converter based on the received reference value for the control variable, a feedback value for the control variable and the at least two states, wherein a control structure of the state feedback controller is configured to provide one or more poles of a closed loop transfer function of the electrical power system at pole positions selected such that the control of the rotor side converter causes the electrical power system to act as a passive system at least in a predefined frequency range to thereby provide damping of oscillations in the frequency range, and
wherein the control structure comprises feedback parameters that determine the feedback gain for an error signal determined based on the reference value for the control variable and the feedback value for the control variable, the feedback gain for the error signal being determined by the pole positions of the one or more poles of the closed loop transfer function.