In this paper, dynamic performance of a transformerless cascaded PWM static synchronous shunt compensator (STATCOM) based on a novel control scheme is investigated for bus voltage regulation in a 6.6kV distribution system. The transformerless STATCOM consists of a thirteen-level cascaded H-bridge inverter, in which each voltage source H-bridge inverter should be equipped with a floating and iso...

i Corresponding Author, M. R. Tousi is PhD student in Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran (e-mail: [email protected]). ii S. H. Hosseininan is with the Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran (e-mail: [email protected]). iii M. B. Menhaj is with the Department of Electrical Engineering, Amirk...

The integration of unpredictable renewable energy sources into the low voltage (LV) power grid results in new challenges when it comes to ensuring power quality in the power grid. Addressing this problem requires control of not only the secondary substation but also control of flexible assets inside the LV grid. In this paper we investigate how the flexibility information of such assets can be ...

The rapid growth of photovoltaics (PV) over the last few years has introduced many new challenges for power system operators. Most PV is integrated into the low-voltage network, where they can cause voltage and line constraint violations if generation exceeds local demand. This thesis explores the capabilities of using demand response to aid the integration of photovoltaic capacity into low vol...

Airport ground lighting (AGL) systems provide visual reference to aircrafts during airport operations. In AGL systems, constant current regulators feed a beacon circuit supplied through isolation transformers. Component modeling is necessary to simulate AGL systems, and thus characterize and predict their behavior. This paper presents an isolation transformer model including transformer core sa...

microgrids are nowadays used to produce electric energy with more efficiency and advantage. however, the use of microgrids presents some challenges. one of the main problems of the microgrids widely used in electrical power systems is the control of voltage, frequency and load sharing balance among inverter- based distributed generators (dgs) in islanded mode. droop method performance degrades ...

This paper proposes an improved direct active and reactive power control (DPC) strategy for a grid-connected doubly fed induction generator (DFIG) based wind-turbine system under unbalanced grid voltage condition. The method produces required rotor voltage references based on the sliding mode control (SMC) approach in stationary reference frame, without the requirement of synchronous coordinate...