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Reliability is an essential requirement for a grid-connected Photovoltaic (PV) system, especially in remote military secured areas, which are difficult to access for the purpose of maintenance. However, the reliability of inverters used in the PV system is mainly affected due to the vulnerability of power semiconductor devices to failure. To improve the reliability of inverters, several fault-tolerant...
The rooftop solar power generation systems with Solar Energy Meter (SEM) is implemented to satisfy the increasing demand for electricity. Gross Energy Meter (GEM) and Net Energy Meter (NEM) are the two types of solar meter where unidirectional Gross Energy Meter is already in use. This paper highlights the design of bidirectional Net Energy Meter which is programmed in FPGA for Microgrid with multiple...
Cascaded H-bridge multilevel inverters (CHB-MLIs) are well accepted for medium and high power grid connected photovoltaic (PV) applications. Independent MPPT and modularity are the advantages of these converters over the diode clamped and capacitor clamped MLIs. However, CHB-MLIs are associated with inter-module leakage current through the parasitic capacitor of PV panels even though an isolation...
In this paper, a cascaded sliding mode control strategy is proposed for a grid-connected inverter system to simultaneously improve the power quality of the local load voltage and the injected grid current. This control scheme also enables a novel seamless transfer operation between grid-connected and stand-alone mode. The controller comprises of an inner voltage loop with proportional controller and...
This paper presents modeling and control for a single-phase grid-connected two-stage micro-inverter system. An average signal model has been developed for a single-phase bridge inverter. The proposed controller has three cascaded control loops. The inner current loop consists of a variable frequency hysteric current mode control which regulates output filter inductor current thereby improved system...
Bulk electrolytic capacitors are used in single phase inverters to reduce the ripple in dc link voltage which is due to the pulsating nature of the instantaneous power. The reliability of an inverter is limited by the lower lifetime of these capacitors. In addition, the switching devices also deteriorate the reliability, due to their significant failure rate. In order to improve the overall reliability...
This paper presents a fault-tolerant two-level single phase voltage source inverter (VSI). The proposed topology requires four additional bidirectional switches and it can continue to operate at rated power under both open circuit and short circuit faults of any switching device. Fault tolerant operation is achieved by swapping the inverter output terminals using the additional switches. Furthermore,...
Maintaining good voltage regulation and achieving fast dynamic response under sudden load fluctuation are extremely important in distributed generation (DG) as well as uninterrupted power supply (UPS) systems. This paper presents a fixed frequency hysteresis current (FFHC) controller, which is implemented on the basis of sliding mode control (SMC) technique and fixed frequency current controller with...
The performance of modern integrated circuits is significantly influenced by coupling effects of interconnects. Crosstalk noise must therefore be analyzed in the early stage of design to develop reliable VLSI interconnects. In this paper, we present a closed form crosstalk noise estimation technique to coupled RLC interconnects based on coupled transmission line theory and Fourier series analysis...
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