Impedance modeling of wind turbine-variable speed pumped storage combined operation system

Abstract

In the combined operation system of variable speed pumped storage and direct drive wind turbine, multiple power electronic devices are coupled with each other, and the operating conditions are complex, it is necessary to conduct deep research on the stability of the system. In the synchronously rotating coordinate d-q-0 system, this paper introduces the speed of the doubly-fed machine as a variable, and adds the small signal model of the pump turbine, and establishes a joint operation system suitable for 0.1 Hz–200 Hz stability analysis broadband impedance model. Based on the generalized Nyquist theory, the corresponding stability analysis of the system under different working conditions and different parameters can be carried out.

Keywords

• Variable speed pumped storage
• Direct drive wind turbine
• AC grid connection
• Impedance method