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8 results on '"Elhassan, Zakieldeen"'

3. Proposed Control Method of Doubly Fed Induction Generator Rotor Side Converter Based on System Frequency Regulation

Author

Yi Tang, Yang Li, and Elhassan Zakieldeen

Subjects
Engineering, Wind power, Vector control, business.industry, Rotor (electric), General Medicine, Frequency deviation, AC power, law.invention, Electric power system, Control theory, law, Transient response, Transient (oscillation), business
Abstract

With the more penetration of wind power based on the DFIG wind turbine to the grid, there is increasing significance for controlling output power in order to meet power system requirements and to participate the frequency regulation in the power grid. This paper is presented proposed control method of DFIG implemented in the RSC using system frequency coordinated control. In this study, the GSC is controlled by using modified vector control method while the RSC is controlled by adjusting the rotor dq-axis currents. The quadrature axis current controls by using the active power generating from the frequency deviation and DFIG store kinetic energy, whereas the direct axis current is controlled by using grid reactive power. Moreover, this power is also used as a main parameter besides rotor speed to control the pitch angle blade in the turbine side. To confirm this method study, the system operation is conducted at steady state and transient modes, and the simulation results were carried out using PSCAD software program. The simulation results show that the voltage of DFIG is very stable, and the system frequency response has been improved. Furthermore, this study realized a full rated value of rotor speed and stable operation of DFIG active power at a steady state besides a good transient response. Moreover, the pitch angle control provided adequate control action at dynamic mode to decrease turbine torque hence to lead to safety transient mode operation.

Published
2014

8. Simplified voltage control of paralleling doubly fed induction generators connected to the network using SVC.

Author

Elhassan, Zakieldeen, Li, Yang, and Tang, Yi

Subjects
*VOLTAGE control, *STATIC VAR compensators
Abstract

This paper presents a simplified voltage control of paralleling doubly fed induction generators (DFIGs) connected to the grid by using static Var compensator (SVC). The DFIG converters are based on a voltage source converter in the grid side converter (GSC) and current source converter in the rotor side converter (RSC). The GSC is employed to work like static synchronous compensator (STATCOM) to provide precise control to maintain the DC link voltage under control. The RSC is oriented to control real and reactive powers of the DFIG. Instead of adding two SVCs in every DFIG bus it connects only one SVC in the point of common coupling of the generators to enhance the voltage stability at a steady state and dynamic operation by decreasing the reactive power hence to increase the voltage amplitude. The comprehensive simulations are carried out using PSCAD/EMTDC program. The results show that the SVC has improved voltage stability and promote the system transient response by compensating reactive power. Furthermore, this study has presented the possibility of using one SVC with low capacity based on the SVC characteristics adjusted only by choosing a suitable transformer rating. Moreover, the system model simulation was tested at steady state and dynamic mode during constant and random wind speeds. Using one SVC with low capacity leads to decrease power dissipation, and this directly reduced the power cost. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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