Dynamic de-excitation-based doubly-fed wind turbine generator fault ride-through control method and system

• Main Authors: ZOU XUDONG, HU JIABING, ZHU HAIPENG, KANG YONG, ZHU DONGHAI, MA YUMEI
• Format: Patent
• Language: Chinese; English
• Published: 05.05.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a doubly-fed wind turbine generator fault ride-through control method and system based on dynamic field suppression, and belongs to the technical field of doubly-fed wind turbine generators. The de-excitation coefficient k is set as a dynamic value changing along with flux linkage attenuation, the absolute value of the de-excitation coefficient k is made as large as possible under the condition that voltage and current constraints are met at the same time, the dynamically changing de-excitation coefficient is used for controlling a rotor current instruction, attenuation of a stator flux linkage free component can be accelerated to the maximum extent, and the control precision is improved. The method is suitable for non-off-grid operation control of the doubly-fed wind turbine generator under the short-circuit fault of the power grid. Compared with a traditional fault ride-through control method, the current margin of the converter can be fully utilized, attenuation of stator transient