Line-interactive uninterruptible power supply (UPS) systems are good candidates for providing energy storage within a micro-grid. Power can be imported from the grid by the UPS to charge its battery in grid-connected mode. The UPS supplies local distributed loads in parallel with other sources in stand-alone mode. In this paper, Power flow is controlled using the frequency and voltage drooping technique. It improves the reliability, economy and efficiency.
Remote monitoring has been implemented in many areas. This paper
introduces its specific application to air-conditioning plant control and
monitoring using PIC Microcontroller. Remote monitoring and intelligent
maintenance is one of the most important criteria for maximizing production
and process plant availability. Initially switching and monitoring were done
through manually and the control switches and level monitoring unit were
placed at separate places. Due to this, we cannot monitor all units at a time. In
our proposed system, remote switching and monitoring is done in the control
room itself. Majority of industries use distributed control system for high
reliability, improve response time, improved operator interface to plant,
improved accessibility of plant data.
The Grid connected PV system requires a proper voltage control controller.
In this paper an efficient voltage control by using slide mode controller with
Maximum Power Point Tracking (MPPT) is presented. The voltage
command is determined by the PV panel. Here the sliding mode controller is
designed so as to balance the power flow from PV panel to the grid and load
such that the PV power is utilized effectively. The design and simulation
using MATLAB is presented in this work.
Multilevel inverters (MLI) have the capability of producing less distorted ac voltages across its output terminals. The output available across any MLI is a stepped sine wave. Among the available configurations diode clamped topology has the ability of providing reverse recovery ability for the switches. So in this project a new converter topology based on Z-Source configuration combined with a diode clamped multilevel is proposed. Usually classical Z-Source inverters contain a diode, capacitors and inductors for boosting the voltage. The Z-Source inverters suffer with inrush currents and resonance. The disadvantages of these capacitors are eliminated with the help of a new circuit comprising of inductors and diodes. The Z-Source of the network contains only inductors. The Z-Source acts like a current source and is cascaded with a diode clamped multilevel inverter. The main advantage of this configuration is that size of the filter is minimized and has the ability of producing least distortion in output current when the system is operated with lagging power factor loads. The proposed circuit is modelled and simulated using MATLAB. Total harmonic distortion levels are estimated with and without filters when supplying resistive and combination of resistive and inductive loads.
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