Analysis of Flyback - PV Inverter to Enable Low Voltage Ride - Through ( LVRT ) Operation During Grid
نویسندگان
چکیده
KHAN, MOHAMMAD SAMEER. Analysis of Flyback-PV Inverter to Enable Low Voltage Ride-Through (LVRT) Operation During Grid Fault. (Under the direction of Dr. Subhashish Bhattacharya). Flyback based PV micro-inverter is a very popular low-cost solution for integrating the photovoltaic (PV) module to an AC grid. As the penetration level of these inverters in the grid is increasing, it may cause problems in the highly integrated PV distribution systems. In a conventional inverter system during low voltage sags on the grid the anti-islanding protection may trigger grid disturbances. The future grid connected systems are expected to perform like a conventional power plant and provide services like Low Voltage Ride-Through (LVRT) during grid faults. In this thesis, the flyback based PV inverters were analyzed for LVRT capability during the three known modes of their operation i.e. Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) and Boundary Conduction Mode (BCM). Also a simulation model of flyback based hbridge inverter model was developed to provide LVRT service during low voltage sags on the grid. The analysis was carried out by modeling the flyback-based PV inverter using PLECS standalone and MATLAB. © Copyright 2016 Mohammad Sameer Khan All Rights Reserved Analysis of Flyback-PV Inverter to Enable Low Voltage Ride-Through (LVRT) Operation During Grid Fault by Mohammad Sameer Khan A thesis submitted to the Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the Degree of Master of Science Electrical Engineering Raleigh, North Carolina 2016
منابع مشابه
Design of A Single-Phase Transformerless Grid-Connected PV Inverter Considering Reduced Leakage Current and LVRT Grid Codes
A new single-phase transformerless grid-connected PV inverter is presented in this paper. Investigations in transformerless grid-connected PV inverters indicate the existence of the leakage current is directly related to the variable common-mode voltage (CMV), which is presented in detail. On the other hand, in recent years it has become mandatory for the transformerless grid-connected PV inver...
متن کاملPerformance Improvement of Single-Phase Transformerless Grid-Connected PV Inverters Regarding Common-Mode Voltage (CMV) and LVRT
The single-phase transformerless grid-connected photovoltaic (PV) systems, mainly the low-power single-phase systems, require high efficiency, small size, lightweight, and low-cost grid-connected inverters. However, problems such as leakage current, the DC current injection and safety issues are incorporated with transformerless grid-connected PV inverters. Besides, the new standards such as Lo...
متن کاملEfficient low-voltage ride-through nonlinear backstepping control strategy for PMSG-based wind turbine during the grid faults
This paper presents a new nonlinear backstepping controller for a direct-driven permanent magnet synchronous generator-based wind turbine, which is connected to the power system via back-to-back converters. The proposed controller deals with maximum power point tracking (MPPT) in normal condition and enhances the low-voltage ride-through (LVRT) capability in fault conditions. In this method, to...
متن کاملLow-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System
This paper presents a low-voltage ride-through (LVRT) control strategy for grid-connected energy storage systems (ESSs). In the past, researchers have investigated the LVRT control strategies to apply them to wind power generation (WPG) and solar energy generation (SEG) systems. Regardless of the energy source, the main purpose of the LVRT control strategies is to inject reactive power into the...
متن کاملLow Voltage Ride-Through Capability Improvement of Doubly Fed Induction Generator using DVR and SMES
Abstract: With the growth of communities and the increasing need for electricity, and because of the many benefits of renewable energy sources, the wind turbine has become a completely commercial and inevitable process, with increasing penetration into the electricity grid. Distribution networks, on the other hand, are subject to fault that cause power fluctuations and outflow of wind units. In...
متن کامل