Physical Sciences and Engineering

In this paper the output voltage regulation in response to the perturbation of input voltage by means of varying insolation condition with reference to the perturb and observe maximum power point tracking algorithm was presented and a battery charging for stand-alone photovoltaic (PV) applications was presented for varying illumination condition. The essential work of modeling, control and regulation of output voltage for battery application due to varying input voltage by means of varying insolation condition was carried out.

The general function of a multilevel inverter is to synthesize a desired output voltage from several levels of dc voltages as inputs. In order to increase the steps in the output voltage, a new H- bridge topology is recommended which benefits from a series connection of several sub-multilevel inverters. In addition, for producing an output voltage with a constant number of steps, there are different configurations with a different number of components.

Multilevel inverters (MLI) have been a suitable alternate to three level inverters in medium/high power applications due to reduced voltage distortion, lesser voltage stress, lower electromagnetic interference (EMI) and improved power quality. The MLI have the distinctive advantage of increased voltage level with reduced switching stress while it suffers from increased power components. In this paper, a new MLI is proposed to nurture the power component count while increasing the number of voltage levels.

Inverter is a power electronic circuit that converts DC supply into AC supply of desired frequency and voltage. Based on the voltage levels at the output, inverters are classified as two level voltage source inverter and multilevel inverter. Advantages of multilevel inverters over two level inverters are less harmonic distortion and reduced electromagnetic interference. Because of these advantages, multilevel inverters are widely employed for active power filtering, reactive power compensation and speed control of electrical machine drives.

In this paper various new hybrid PWM strategies for sine-trapezoidal reference with triangular carrier PWM signals are analyzed with the new symmetrical nine level inverter topology. This new multilevel level inverter uses only ten switches rather than conventional multilevel inverter uses sixteen switches for the same nine level output. The topology has many advantages of less switching losses, converter cost and installation cost.

This paper presents hybrid power generation systems which consist of following main components: photovoltaic arrays (pv), an electrolyzer system and proton exchange membrane fuel cells (PEMFC). The hybrid scheme inherently adapts to the changes in irradiation or load. An easy and accurate method of modeling photovoltaic arrays is proposed. The model and fuzzy based control strategies are combined to form intelligent controllers that are more accurate and robust.

In this paper, Photovoltaic (PV) array is connected to a Current Source Inverter (CSI) fed load. The application of solar PV panel output as input to CSI is plating industry. The advantage of the proposed micro-grid is the rumination of DC-DC converter of traditional PV systems. In addition to this, Maximum Power Point Tracking (MPPT) algorithm is also been implemented for generating constant current at the source of CSI.

Energy Management System Decentralized architecture that uses regional energy management, Information technology (IT). It is computer aided used for control, monitor performance optimization in transmission system. The control and monitoring uses advance application like SCADA PMU etc. This paper deals with a brief review on EMS and its development in smart grid system.

A design of dual mode fuzzy logic load frequency controller for interconnected two area thermal power systems with superconducting magnetic energy storage (SMES) unit is proposed in this paper. Nowadays due to increase in size, increased demand and complexity in interconnected power system, load frequency controller has become more significant. SMES technology has the potential to bring real power storage characteristics to the utility transmission and distribution systems.

This paper comprises of various Carrier overlapping PWM scheme with performance evaluation for Modified Cascaded H-Bridge Multilevel Inverter (M-CHB-MLI). This topology consists of a Half Bridge cells DC voltage sources. Instead of 16-controlled switches used in conventional topology for 9-level output voltage, only twelve controlled switches are required for Modified Cascaded H-Bridge Multilevel Inverter topology which in turn reduces the complexity and also improves its performance parameters.