Contribution to the Control Power of a Wind System with a Storage System

Here we present two techniques of commands: DTC (direct torque control) and DPC (direct power control), which are applied to the system for converting wind energy with storage. The wind generator used is based on a double-fed induction generator (DFIG), in which the stator is connected directly to the network and the rotor is connected to the network through the power converter. The Flywheel Energy Storage System (FESS), which is based on a flywheel, an induction machine (IM), and an electronic power converter, is associated with the wind generator via the DC bus. The two converters’ side DFIGs and the FESS are controlled by DTC. The three-level converter side electricity grid, which ensures constant DC bus voltage, is controlled by the DPC. The main goal of the direct control of these systems is to eliminate the block of pulse width modulation and loops by regulating internally controlled variables. The use of a switching table makes the system more efficient from a technical rather than an economic point of view.