1 HIGH-PENETRATION, WITHOUT STORAGE, PV SOLAR-DIESEL GENERATOR IN ISOLATED SYSTEM Mazin Mustafa Sustainable Energy & Power Electronics Research Cluster (SuPER), FKEE University Malaysia Pahang Email: alqasimustafa4@gmail.com Abu Zaharin Bin Ahmad Sustainable Energy & Power Electronics Research Cluster (SuPER), FKEE University Malaysia Pahang Email: azahrin78@gmail.com Ekhlas Mhawi Sustainable Energy & Power Electronics Research Cluster (SuPER), FKEE University Malaysia Pahang Email: ekhlasmhawi@gmail.com ABSTRACT The aim of this paper is to reduce the cost of supplying electricity in remote area and to get optimal operation of the distribution network including renewable energy sources. In actual power system operations, the load is changing continuously and randomly, as the ability of the generation to track the changing load is limited due to physical/technical considerations, to maintain the desired active output power of a generator matching with the changing load, there results an imbalance between the actual and the scheduled generation quantities. In recent years, many facilities all over the world the move towards renewable energy uses. For example, wind or photovoltaic power (PV) is an alternative, a source of clean energy and sustainable electricity production. PV certainly does not need to be tall and strong tower, as well as lacking of any vibration or noise, and does not need to be refrigerated. On the other hand volatility and rising fuel prices with considerations of greenhouse gas emission, and carbon footprint reduction therefore, certain features make PV generation worthwhile to consider in planning and electricity network operations now and in the future. The simulation system model and tested using MATLAB/ Simulink and the results are presented. Keywords: Diesel Generator, PV Solar, Frequency Regulator INTRODUCTION Power system can be considered in actual power system operations is a generator supplied with different load ,containing active and reactive power and constant frequency value during the steady-state situation through transmission and distribution stations down to demand. Generation capacity to track the load changes is limited because of the physical / technical reasons, to maintain the desired active output power generator according to the changing load, there is an imbalance between the actual and planned values of generation, this imbalance leads to a frequency error, the difference between the actual and the synchronous frequency. Power system structure and operation of the distribution system based on alternative energy sources, renewable units (solar, wind) is changing with the integration. The main task of the distribution network while maintaining the voltage level of the appropriate limits is to supply electricity loads. Falls into a major problem with the stability constant conserved in all variables that occur during the flow of energy to power the loads demand. In the network the stability of the distribution systems with a large penetration PV solar generation, voltage stability becomes an important issue, especially in the case of involving the borders of the possibility of loads. Penetration levels of PV may affect the stability of the system is to improve or worsen the stability of the system. Due assortment of renewable technologies and the complexity of the power system, modeling of PV units becomes decisive to obtain a correct reaction of the impact on the power system stability. Profile of voltage drop along the power supply because of the impedances of the line and the load level is supplied, the load conditions of the grid is changed after photovoltaic connected to the distribution network in the points in which they are connected, namely, the points of common coupling (PCC). The application of PV systems in power systems can be divided into two broad areas: off-grid or stand-alone applications and on-grid or grid-connected applications. Stand-alone PV systems can be used to provide power to distant loads that have no access to electricity grids as grid connected applications are used to provide energy for local loads and exchange power with utility grids. Photovoltaic systems can improve operation of power systems by improving the voltage profile and reduction of energy loss distribution feeders, the expenditures for maintenance and loading of transformer tap changers at peak hours (Farhoodnea et al,2013). The diesel engine must be able to follow the variation of loads and PV power. The size of frequency variation indicates how well the diesel and its governor maintain the balance of active power in the system, and the size of voltage variation indicates how well the gen- set and its voltage regulator maintain the balance of reactive power through the generator excitation. Under transient conditions, the frequency and the voltage will not be absolutely constant because PV power and load variations change constantly. Several studies have been carried out to minimize the harmful effects of connecting PV generators to the isolated utility. The most common practice is to use energy storage systems (ESSs) as smoothing devices for a PV system’s output (Park, J. S et al, 2001). However, the capital and maintenance cost of large capacity ESS is a barrier to the large-scale installation of PV systems. Besides, these methods cannot control PV output power considering the power utility condition like load variation. Therefore, they are not into providing any frequency control. All of these methods tried to smooth the fluctuating PV power. However, none of them gave emphasis on controlling the PV brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by UMP Institutional Repository