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This paper presents a single phase grid-connected PV system integrating energy storage system (ESS) using cascaded multilevel inverter. A Discrete Fourier Transform (DFT) Phase Locked Loop (PLL) method is proposed to improve system dynamic performance. A coordinated active and reactive power management (ARPM) strategy is developed based on the dual-stage DFT PLL method. The point of common coupling...
This paper presented a grid-connected inverter incorporating multiple technical concepts like “single-stage”, “multilevel” and “transformerless”, and thus attracting in cost and efficiency. Also energy storage (ES) was integrated to assist extensive power regulation. A complete control scheme was developed to achieve wide range real/reactive power management involving pure real power, pure reactive...
This paper presents a single-stage grid-connected inverter with energy storage system (ESS) for small distributed power generation (DG) system application. A reactive power allocation (RPA) strategy is developed so the proposed inverter can provide real and reactive power in wide range. In particular, the ESS can provide not only harmonic compensation but also reactive power to enhance the system...
This paper presented an ultracapacitor (UC)-based energy storage system (ESS) design for high power motor drive application. The ESS is cascaded with three-phase multilevel motor drive inverter to provide not only harmonic cancellation but also real power compensation during transients and steady states. An active power control strategy was developed to implement desired power flow modes during acceleration,...
This paper proposes two cascaded multilevel inverter topologies and corresponding control strategies applied to motor drive that interfaces single DC source and ultra-capacitor (UC) energy storage elements. In the first topology, a dynamic control method is developed, which allows the UC to provide reactive power to cancel lower order harmonics through a conditioning inverter both in steady state...
A pair of back-to-back power electronic inverters can control the real and reactive power flow in a transmission line. This configuration is called a unified power flow controller (UPFC). This paper presents a control strategy based on d-q axis theory for the operation of a UPFC. A new decoupling control strategy for the series converter and coordination control for the shunt converter is tested with...
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