A new type of generator, a transgenerator, is introduced, which integrates the wind turbine and flywheel into one system, aiming to make flywheel-distributed energy storage (FDES) more modular and scalable than the conventional FDES. The transgenerator is a three-member dual-mechanical-port (DMP) machine with two rotating members (inner and outer rotors) and one stationary member (stator). The transgenerator–flywheel system is introduced with its configuration, transgenerator overview, flywheel operation principle and power management strategies, and control system. Simulations are performed in MATLAB 2023b/Simulink to verify the system viability, including control system verification and flywheel storage performance evaluation. The results show that the inner and outer rotors can be controlled independently with an accurate and fast control response, and the grid-side control works properly. The flywheel performs well, with considerable charging power and storage capacity.

This paper designed a new type of generator, transgenerator, that integrates the wind turbine and flywheel into one system, aiming to make the flywheel distributed energy storage (FDES) more modular and scalable than the conventional FDES. The transgenerator is a three-member dual-mechanical-port (DMP) machine with two rotating members (inner and outer rotors) and one stationary member (stator). The transgenerator-flywheel system is introduced with the system configuration, transgenerator overview, flywheel operation principle and power management strategies, and control system. Simulations are performed in MATLAB/ Simulink to verify the system viability, including control system verification and the flywheel storage performance evaluation. Results show that the inner and outer rotors can be controlled independently with accurate and fast control response, and the grid-side control works properly. The flywheel performs well with considerable charging power and storage capacity.

The authors proposed a transgenerator-flywheel system for wind power generation and storage in a previous paper. The transgenerator is a three-member dual-mechanical-shaft (DMS) electric machine consisting of a wound stator, a permanent magnet (PM) rotor, and a wound rotor. Due to the structural and control complexity of the transgenerator, the double d-q axes-based field-oriented control (FOC) is applied to control the two rotors independently for different purposes. This paper reviews the proposed transgenerator-flywheel system and illustrates how the control references of the current components are calculated using double d-q axes. Simulations are performed in MATLAB/ Simulink to verify the independent control of the two rotors and evaluate the control performance. Results show that with the double d-q axes, the inner and outer rotors can be controlled independently with accurate and fast control response.