Power Quality Enhancement For Real And Reactive Power Coordination Essay

A Power system is an connection of generators to load centres. Through H.V. electrical lines & in general is controlled mechanically. It can be divided into 3 subsystems: Generation, X’mission and Distribution-systems. The electric power demand is Growing and building of new generating units & transmission circuits is becoming difficult because of environmental & economic reasons. So, power utilities are forced to depend on utilization of existing generating units and to load existing lines close to their heating limits.

Fig. 5.12. Control of the dc–dc converter with FLC to produce less power under voltage sag: grid voltages, related grid currents, related dc-link

So, the above issues can be applied to distributed power systems similarly, and the recent research focuses are summarized as follows:

Indiscriminant application of individual distributed generators can cause as many problems as it may solve. better way to realize emerging potential of distributed generation is to take system approach which views generation, associated loads as subsystem or “microgrid”. This approach allows for local control of distributed generation thereby reducing or eliminating need for central dispatch. During disturbances, generation, corresponding loads can separate from distribution system to isolate

The significant increase in penetration of renewable energygeneration is expected to affect the operational aspects of powersystems and more specifically isolated micro grids that mainly relyon renewable energy sources. Indeed, the issue of UC schedulesand real-time dispatch of a micro grid with controllable DGs is morecomplicated in the presence of high wind and solar generation pen-etration. To address these operational challenges, it is necessaryto manage the variability and uncertainty associated with theseenergy sources. It has become clearer than ever that a flexiblemicro grid is vital. In this paper, a comprehensive stochastic mathe-matical model has been developed to enable operation interactionof DERs under uncertainty in islanded micro grids. Hence prob-abilistic coordination of DERs on micro grid operations has beenexamined with respect to their independent presence and withconsideration of the hourly interruption cost for residential, com-mercial, and industrial customers in order to determine the optimalprobabilistic interruptible load, if required. The simulation resultsshow that

D. Card et al.(2007)[33] This paper presents a review on distributed generation planning in the distribution power system networks from different power system performances such as minimization of real and reactive power loss

In the past two decades, the problem of optimal power flow (OPF) has received much attention. It is of current interest of many utilities and it has been marked as one of the most operational needs. The OPF problem solution aims to optimize a selected objective function via optimal adjustment of the power system control variables, while at the same time satisfying various equality and inequality constraints.

If the power quality is poor, it will have drastic effect on the appliances associated with the power distribution network. A micro grid is a local grid that has the ability to operate by itself even when it gets disconnected from the main grid. It provides backup in case of emergencies that render the main grid nonfunctional. This paper provides a detailed study of the changes in power quality for a grid connected micro grid in the various scenarios. MATLAB/Simulink is used to integrate the power sources with the loads. The variable nature of power with distributed generators is examined.

The power flow analysis involves the calculations of power flows and voltages of a transmission network for specified terminal or bus condition. Such calculations are required for the analysis of steady-state as well as dynamic performance of power systems [1].

BACKGROUND: The power system, built on century-old technology and approaches, was designed to deliver electricity from large, remote power plants across significant distances to the cities and towns where electricity is used. For that reason, there is great need for an effective Protection and Control of the System to complete the chain of Generation, Transmission and Distribution to the users.

This paper deals with a Cuk Topology for Power Factor Correction (PFC). Most of the front-end PFC converters are designed using diode bridge and has lower efficiency due to losses with reduced power factor.The current flow, during each intervals of the switching cycle reduces the conduction losses compared to the conventional Cuk PFC Rectifier. The converter also provides protection against inrush current occurring at start-up, decreases input current ripple and reduces Electromagnetic Interference (EMI).It works in the Discontinuous Conduction Mode (DCM) to provide almost unity power factor and low distortions in the input current. To analyse the performance of this converter, a model based on the CUK topology has been designed by using MATLAB/ SIMULINK software and implemented with Proportional-Integral (PI) and Fuzzy logic controller.

This paper deals with the staging the evaluation of a three- phase Shunt Active Power Filter for Power Quality improvement. Power Quality problems can be take up using Shunt Active Power Filters. A simulation model based on mathematical model of a three-phase shunt active power filter has been developed. The results show an inherent power quality improvement in terms of reduced Total Harmonic distortion (THD) of source current. It also betrays power factor correction (PFC) properties to a large extent as the source current and source voltage are in phase. Keywords- shunt active power filter (SAPFs), Total harmonic distortion (THD), Proportional integral (PI) and Hysteresis current controller (HCC).

However, there is a factor that limits the present implementation of existing hierarchical control in smart grid. Because the voltage in each DG’s terminal is different, the accuracy of reactive power sharing is low [2]. Based on this problem, this project

Automatic Power factor correction device reads the power factor from voltage and current, calculating the compensation requirement switch on different capacitor banks. So in our work we are going to design a control panel which will provide a nearer unity Power Factor When Plant

This project has been carried out at the department of the electrical engineering at S.V.I.T. Vasad. It has been great opportunity to work with this project and get knowledge about this area of the power electronics.