International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 07 | July 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 3021 Modelling and Analysis of Dickson Converter for PV Connected Micro- Grid System using Hysteresis Current Control Technique T. V. Viknesh 1 , V. Manikandan 2 1,2 Department of Electrical and Electronics Engineering, Coimbatore Institute of Technology, Coimbatore-641014, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - This paper proposes a hybrid system consisting of a photovoltaic (PV) array and rechargeable battery integrated to the distribution grid with the scope to perform load sharing and reducing demand with the distribution grid. The PV array, charge controller and the lead acid battery are connected to the dc-side of the voltage source inverter (VSI) through improved Dickson converter. Further incremental conductance MPPT control algorithm is developed for 1 Soltech 230-WP solar PV array and checked for different irradiance and temperature. Meanwhile Hysteresis current control method, the most important current control strategy is applied for VSI in this paper. The performance of system is analyzed using Matlab/Simulink to verify the output efficiency of the proposed system. Key Words: Modelling, Dickson converter, Photovoltaics, micro grid, Hysteresis current 1. INTRODUCTION Nowadays electricity power network has becoming critical issue on maintaining its reliability, sustainability and power quality [1]. The current electric power grids are growing old in this developing world. As a result of this aging grid and old infrastructures become more prominent as the power to demand ratio increases. These former equipment’s are prone to failures, and sometimes the old power planning fails to satisfy necessities [2]. So currently the researchers of all country are working for the update called micro grid and smart grid to overcome the current challenges of existing power grid. So in recent years the concept of distributed generation (DG) have increased rapidly due to driving forces such as fuel prices, reducing carbon emission and advancement in technology [4]. When the distributed energy resources (DER), which usually have power rating are of few kilowatts, are connected to the medium or low voltage distribution levels of the power networks, consumers are able to benefit from the increased reliability and reduction in total energy loss [5]. Solar photovoltaic (PV) power has pulled out a greater attention among other DER sources because of its advantages. PV enables clean, renewable, zero-emission electricity production which is completely fighting against future raise in fossil fuel price, which is unlike other DER such as fuel cells and micro-turbines. PV arrays can either be designed as stand-alone and grid-connected systems. Stand-alone systems are equipped with energy storage devices such as batteries to store electricity for sunless hours and act as energy buffers between the input power from the solar cell and the output power to the load. In grid-connected operation, the PV system supplements the grid power and it represents the fastest growing sector today [3]. This paper proposes integration of improved Dickson converter within micro grid comprising of PV array, charge controller, lead acid battery. The main advantage of Dickson converter is they can be used in high power applications [12]. Hysteresis current control technique is used as controller for inverter output. Meanwhile novel INC-mppt technique is used as a closed loop control with PV array for power converter. Load of 1.5 kVar is used and simulation is done using Matlab 2014a and results are shown under section E. The rest of paper is organized as follow under section I the sub-categories are Section A is modelling of PV array, Section B is modelling of charge controller, section C is of novel Incremental conductance MPPT, section D is modelling of Dickson converter, section E is Inverter current control and section II contains all necessary simulation results of proposed method and section III and IV are conclusion and references respectively. 2. STRUCTURE OF PROPOSED GRID CONNECTED PV SYSTEM Fig 1 shows the block diagram of proposed PV connected grid system. The system composes of PV array, charge controller, MPPT control, Rechargeable batteries connected with charge controller, DC-DC boost converter i.e. Dickson converter and finally DC side of power converter connected voltage source inverter. The Mppt block shown in fig.5 controls Dickson converter while inverter is controlled using hysteresis control method with the reference current I * abc as shown in fig 16. The output of the VSI is linked with LC filter represented by Lf and Cf as in fig 9 to eliminate the high switching frequency harmonics generated by the VSI. When the grid is required to be isolated from the whole system, which can occur unintentionally due to a fault or intentionally due to a scheduled maintenance, the circuit breaker operates to disconnect the distribution grid from the whole system.