www.ijecs.in International Journal Of Engineering And Computer Science ISSN:2319-7242 Volume – 5 Issue -02 February, 2016 Page No. 15805-15809 P. Velmurugan, IJECS Volume 05 Issue 2 February 2016 Page No.15805-15809 Page 15805 Analysis of PV Cell-based DG involving Improved Power Quality Converter for voltage control P. Velmurugan *1 , B. Baskaran 2 and G. Irusapparajan 3 1 Research Scholar, Dept. of EEE, Annamalai University, Annamalai Nagar – 608002, Tamil Nadu, India velmuruganpqphd@gmail.com 2 Professor, Dept. of EEE, Annamalai University, Annamalai Nagar – 608002, Tamil Nadu, India baskarancdm@gmail.com 3 Professor, Dept. of EEE, Mailam Engineering College, Villupuram – 604 704, Tamil Nadu, India irusgkm@gmail.com Abstract: The research investigated the impact on the power system with an extensive penetration of photovoltaic (PV) generation. A model of PV generation suitable for studying its interactions with the power system was developed. The dynamic response of a PV generation system to rapid changes in irradiance was investigated. An aggregated model of grid-connected PV generation was built, and it was used for simulating the integration of PV generation on a large-scale. Voltage control technique was investigated by simulation. Distributed Generation (DG) units are connected to the grid increasing nowadays for several reasons. Most DG units are relatively small and connected to the distribution network. A large part of the DG units connected to the grid via power electronic converters. The main task of the converters is to convert the power that is available from the prime source to the correct voltage and frequency of the grid. The general objective of this paper is to investigate how the power electronic converters can support the grid and solve power quality problems. An IEEE-5 bus system considered for this work to validate the power electronic converter using MATLAB/ Simulink. Keywords: Distributed Generation, PV Cell, IEEE – 5 bus system, Voltage control, Zeta converter, power Quality. 1. Introduction The Over the last years an increasing number of Distributed Generation (DG) units are connected to the grid. This development is driven by governmental policy to reduce greenhouse gas emissions and conserve fossil fuels, as agreed in the Kyoto protocol, by economic developments such as the liberalization and deregulation of the electricity markets, and by technical developments. Most DG units are relatively small and connected to the distribution network (DN). A large percentage of the sources are connected to the grid via power electronic converters. The introduction of DG results in a different operation of the electrical power system. The conventional power system is characterized by a power flow from a relatively small number of large power plants to a large number of dispersed end-users. Electrical networks transport the electrical energy using a hierarchical structure of transmission and distribution networks. In a limited number of control centers the system is continuously monitored and controlled [1-2]. The changes due to the introduction of DG are mainly caused by the differences in location and operation principle between the DG units and the conventional generators and loads. The most important differences are: 1) The DG units are mostly connected to the DN; this introduces generators in the DN, which historically only contained loads [3-4]. 2) A large percentage of the DG units are connected to the grid via power electronic converters, which have a behaviour that is fundamentally different from the behaviour of the conventional synchronous machine based generators [5-6]. 3) Several types of DG unit are based on renewable energy sources like sun and wind, which are uncontrollable and have a recurring character [7-8]. 4) Most DG units behave as „negative loads‟ and do not participate in the conventional control of the network [9]. The introduction of DG causes several problems. The four problems that will be investigated in this thesis are described in this section. They are all caused by the differences in location and operation principle between DG units and the conventional generators and loads, outlined in the previous section. First three problems with a local impact are considered. The fourth issue has a global impact, meaning that the system as a whole is affected [10]. This article focuses voltage control of DG with power electronics converters application. The objective of voltage control is to maintain the RMS value of the voltage within specified limits, independent of the generation and consumption [11-12]. Conventional voltage control in the high-voltage transmission network is mainly performed by the large power plants. In Distribution Networks (DN) voltage control is done by tap changers on distribution transformers. This control is relatively slow and compensates for the current depending voltage drop along the line, based on the assumption that only loads are connected to the network. The introduction of DG units in the DN will change the power flow in a part of the network. Also, some DG units have a primary energy source that fluctuates [9], especially those that are based on renewable energies such as the wind and the sun.