The paper presents a modified active and reactive power based control of a solar PV array integrated unified power quality conditioner (PV-UPQC-S) with three level neutral point clamping inverter (NPCI). The system achieves improvement in power quality and generation of clean energy and this in turn improves feature of the system. The fundamental-frequency positive-sequence (FFPS) of voltage components at the point of common-coupling (PCC) are obtained using the generalized cascaded delay signal cancellation technique (GCDSC), and are used in reactive power based control to approximate reference signal for the PV-UPQC-S. This alteration in reactive power based theory allows its implementation for control of PV-UPQC-S for distorted state of PCC voltage. The voltage source converter of series type for PV-UPQC-S gives a portion of VAR(reactive power) to load even during any condition of grid. The photovoltaic array is unified at UPQC dc bus which contributes a proportion of load active power and this reduces the demand on supply. Simulation using MATLAB-Simulink is done to verify the system performance for steady state and dynamic conditions.

The purpose of this research is to find the loading limit of a power system before hitting voltage instability and to assess the margin to voltage instability of a system consisting of a wind farm. An index called Bus Apparent Power Difference Criterion (BSDC) is used to find maximum loadable point. The measure depends on the way that in the region of the voltage collapse no extra apparent power can be delivered to the affected bus. The analysis is performed combination of wind power injection at different wind speeds and line outages in the network. In the feasibility and siting studies of wind farms the steady state analysis with network contingencies give the utility or the developer a sense of network condition upon the injection of power in the network. However, the extent of voltage stability impacted due to load growth in the system is not assessed. The research paper makes way to assess the impact on voltage stability margin with obtaining the maximum loadable point of the system and assessing the best suited bus to integrate a wind farm into the system.

The growing energy demand in developing nations has triggered the issue of energy security. This hasmade essential to utilize the potential of renewable resources. Grid connected PV systemsis the best alternatives in renewable energy at large scale. Analysis of these gridconnected plants could help in designing, operating and maintenance of new grid connected systems.The objective of this paper is to model the design and simulation of grid connected 10MW solarphotovoltaicpower plant by using the specifications of equipment's provided based on the availability of the component in Shivanasamudram,Karnataka,India. The PV generation system behaves well in different conditions of solar radiance and temperature of PV panels, preserving its stability and succeeding in extracting the maximum power from the PV panels by MPPT technique.

In this paper a new reference signal generation control technique is proposed for integration of Unified Power Quality Conditioner (UPQC) with Plug-in Hybrid Electric Vehicle (PHEV) for overcoming voltage sag and other voltage fault conditions on wind farms which is connected to grid. The interaction of wind generators and grid causes increased short circuit current which leads to instability during fault conditions. The new control technique which generate reference signals for series active power filter (Series APF) and shunt active power filter (Shunt APF) of UPQC by using PHEV as an Energy Storage System (ESS) which will take care of all types of voltage faults occurred in the system and provide energy storage to DC link between Series APF and Shunt APF parts of UPQC. The control scheme proposed also maintains transaction of active and reactive power of Wind Energy Conversion System based on Squirrel Cage Induction Generators (WECS-SCIG) and grid. The fuzzy logic provides fast and dynamic response to clear faults occurred in the system.

-Electrical Power systems are designed to meet the continuous variation of power demand. The objective of modern electric power utility system is to deliver reliable power to the customer at low cost without violating the operational constraints. This formulates the Economic Load Dispatch (ELD) problem. So Economic dispatch & Interruptible Load Management is formulated by using Particle Swarm Optimization (PSO). Integrating wind energy into bulk power system will leads to operational challenges like non-dispatch ability and variability. By considering the wind power along with Economic Load Dispatch and Interruptible Load Management is investigated by PSO. In this paper, six unit systems are considered and the conventional method like Lambda-Iteration is compared with PSO method with cost. IEEE 30 bus system is used for checking the effectiveness. At the end, the costs of both methods are compared to examine the best one among them.