Abstract
The utilization of Flexible AC Transmission System (FACTS) devices in a power system can potentially overcome limitations of the present mechanically controlled transmission system. Also, the advanced technology makes it possible to include new energy storage devices in the electrical power system. The integration of Superconducting Magnetic Energy Storage (SMES) into Static Synchronous Compensator (STATCOM) can lead to increase their flexibility to improve power system dynamic behavior by exchanging both active and reactive powers with power grids. This paper describes structure and behavior of STATCOM/SMES compensator in power systems. A control strategy based on direct Lyapanov method for compensator is used. Moreover, the performance of the STATCOM/SMES compensator in a load variation condition is evaluated by PSCAD/EMTDC software in test system. Also, SMES capacity effects on integrated compensator are investigated.
Highlights
In recent years, by ongoing growth in electric power demand and deregulation in the electrical power industry, numerous changes have been introduced to modern electricity industry
The control of active and reactive powers was accomplished by controlling firing angles of the GTOs and the dc voltage that is determined by Structure preserving model (SPM) of power systems has been presented to improve the modeling of generators and load representations such that system parts represent more realistic behavior [9]
STATCOM controlling law that has been derived from Eq (16) will be as in Eq (17): d ud = k1 dt (−Vdi), (17) d ug = k2 dt (−Vgi), where k1 and k2 are positive coefficients and their value depends on oscillation damping time
Summary
By ongoing growth in electric power demand and deregulation in the electrical power industry, numerous changes have been introduced to modern electricity industry. This model consists main parts of the STATCOM controller, the SMES coil and the interface between both devices. The inclusion of a SMES in the dc bus of the STATCOM requires to adapt the voltage and current levels of both devices by utilizing an interface. In this case, a two-quadrant three-phase dc-dc converter is chosen as interface. When the SMES needs to be charged, the chopper connects the dc link voltage to the SMES so that the current inside the SMES increases and make a power flow from the dc link to the SMES coil. The control of charge/discharge process is accomplished by controlling the duty cycle [11]
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