Grid Synchronization of Seven-Phase Wind Electric Generator Using d-q PLL

Abstract

Abstract:The evolving multiphase induction generators (MPIG) with more than three phases are receiving prominence in high power generation systems. This paper aims at the development of a comprehensive model of the wind turbine driven seven-phase induction generator (7PIG) along with necessary the power electronic converters and controller for grid interface. The dynamic model of the system is developed in Maltlab/Simulink. Synchronous reference frame phase-locked loop (SRFPLL) system is incorporated for grid synchronization. The modeling aspects are detailed and the system response is observed for various wind velocities. The effectiveness of seven phase induction generator is demonstrated with the fault tolerant capability and high output power with reduced phase current when compared to conventional 3-phase wind generation scheme. The response of the PLL is analyzed and the results are presented.

Postfault Operation of Five-Phase Induction Machine With Minimum Total Losses Under Single Open-Phase Fault

“…It is noted that under IRFOC, the core loss depends directly on the direct current component and indirectly on the torque producing component, where the stator frequency, ω , is a function of the quadrature current component, as indicated by (6). Therefore, at rated reference speed, the change in core loss with mechanical loading may be neglected, as will be shown in the results section.…”

“…In the proposed controller, the current components * and * , which represent the field and torque reference stator current components, respectively [34], are derived based on the required reference flux level and speed error. The stator fundamental current components, * , are then obtained from the reference dq current components through Park's transformation using the estimated slip (6) and the rotor angular speed. Based on the proposed optimization technique introduced in the subsequent subsections, the secondary subspace sequence current components, * are obtained from the reference current components, * , using an optimized gain matrix ensuring minimum total machine losses.…”

“…The global interest in sustainability has been a steady driver in the growth of wind energy. Today, wind energy possesses a significant share of the renewable energy mix [6]. Incorporating wind energy into distribution systems may have various benefits like minimizing power losses and increasing efficiency [7][8][9].…”

Assessment and control of a three-phase grid connected wind turbine

“…The proposed structure of PLL based on proportional integral (PI) is illustrated in Figure 4 (Chandramohan et al, 2017).…”