Active and Reactive Power Control for PV based Water Pumping System

The scarcity of fossil fuels and lack of electrification of several rural areas in developing countries like India has encouraged the use of renewable energy sources in recent times. The solar photovoltaic power is of great relevance in areas where electric lines are not yet laid. Since agriculture is generally the main source of income in most of rural India, irrigation is one of the biggest challenges. PV powered pumping systems have gained popularity in the past few decades. The nature of the load demands an active and reactive power control in standalone systems powered by renewable sources. There are several techniques to achieve active and reactive power control in a microgrid. In this paper a technique to control PQ is employed to a PV powered composite load and results are evaluated using MATLAB/SIMULINK

Optimal controllers design for voltage control in Off-grid hybrid power system

Generally, for remote places extension of grid is uneconomical and difficult. Off-grid hybrid power systems (OGHPS) has  renewable energy sources integrated with conventional sources. OGHPS is very significant as it is the only source of electric supply for remote areas. OGHPS under study  has Induction generator (IG) for wind power generation, Photo-Voltaic source with inverter, Synchronous generator (SG) for Diesel Engine (DE) and load. Over-rated PV-inverter has capacity to supply reactive power.  SG of  DE  has Automatic voltage regulator for excitation control to regulate terminal voltage. Load and IG demands reactive power, causes reactive power imbalance hence voltage fluctuations in OGHPS. To manage reactive power for voltage control, two control structures with Proportional–Integral controller(PI), to control  inverter reactive power and  SG excitation by automatic voltage regulator are incorporated.  Improper tuning of controllers lead  to oscillatory and sluggish response. Hence in this test system both controllers need to be tune optimally. This paper proposes novel intelligent computing algorithm , Enhanced Bacterial forging algorithm (EBFA) for optimal reactive power controller for voltage control in OGHPS. Small signal model of OGHPS with proposed controller is  tested for different disturbances. simulation results  are compared  with conventional  method , proved the effectiveness of EBFA

EFFECT OF STATIC VAR COMPENSATOR ON VOLTAGE STABILITY UNDER NETWORK CONTINGENCIES

This paper focuses on enhancement of system performance under network contingencies through an optimal placement and optimal setting of static var compensator (SVC). The goal of the methodology developed is to identify the weakest bus using an index called Line Flow Index (LFI) and to maintain the voltages at all load buses within their specified limits through an optimal placement and optimal setting of SVC under contingency Condition. This premise is attested on 6- bus and 30 bus systems and the simulation results are presented to show the effectiveness of the method

EFFECT OF UPFC ON SYSTEM PERFORMANCE UNDER NORMAL AND FAULT CONDITION

This paper deals with the effect of Unified Power Flow Controller (UPFC) on the system performance under normal and fault conditions. Simulink models are developed for 7 bus system with and without UPFC. Digital simulation using MATLAB/SIMULINK is done with these models and the results are presented. The effect of UPFC on real power, reactive power and the voltage is also presented