A Rotor-Sync Signal-Based Control System of a Doubly-Fed Induction Generator in the Shaft Generation of a Ship

Abstract

A doubly-fed induction machine in generator-mode is popularly used for energy generation, particularly in the case of a variable speed, such as in the wind generator, the shaft generator of a ship, because the doubly-fed induction generator is able to maintain a stable frequency when changing the rotor speed. This paper aims to propose a novel method for controlling the shaft generation system of a ship using a doubly-fed induction generator. This method uses the rotor signals of a small doubly-fed induction machine as base components to create the control signal for the doubly-fed induction generators. The proposed method will be proven by both theory and a simulation model. The advantage of the proposed method is that the control system of the generator can be simply built, but it functions effectively. The generator voltage always coincides with the grid voltage, even when the grid voltage and the rotor speed are changed, and the reactive and active power of the generator fed into the grid can be separately controlled.

Improved Rotor Flux and Torque Control Based on the Third-Order Sliding Mode Scheme Applied to the Asynchronous Generator for the Single-Rotor Wind Turbine

“…The asynchronous generator is one of the most popular and widely used in the field of wind energy due to its low maintenance, reduced cost, robustness, efficiency, ease of control, minimum energy losses, and ability to work at a speed that varies by ±33% around the synchronous speed [35]. On the other hand, this is evident in the number of papers published on AG, where several controls have been developed in order to improve the characteristics of this generator [36][37][38][39][40]. In order to obtain the mathematical form of the generator, the Park transform was used.…”

The Power-Sharing System of DFIG-Based Shaft Generator Connected to a Grid of the Ship

“…The following requirement is to control the active and reactive power fed into the ship grid independently according to the consumption load of the ship. In the shaft power generator systems using DFIG with rotor-sync signal technique, the first condition is always satisfied [12]. Therefore, the remaining problem is setting up the control system for controlling the power components emitted to the ship grid according to the desired values.…”

“…The author has proposed a new method that does not need the transmission stage of coordinates [12]. Instead, the rotor signals of the small DFIM are an initial signal for controlling the rotor current fed into the DFIG.…”

The cascade methods of doubly-fed induction machine for generator system

“…The research [25], [26] has analyzed the mathematical model of this system, then pointed out the advantages of applying this system in the generator connected to the grid. To show more detail the operating principle and the characteristics of the signals at all stages, we will build and simulate the system model on Matlab Simulink.…”