IJSRSET1844224 | Received : 20 March | Accepted : 31 March 2018 | March-April-2018 [(4) 4 : 962-966] © 2018 IJSRSET | Volume 4 | Issue 4 | Print ISSN: 2395-1990 | Online ISSN : 2394-4099 Themed Section : Engineering and Technology 109 Harmonic Compensation using Coordinated Control of Dual Interfacing Converters at Microgrid D. Agila, D. Anbukkarasi, A. Barathi, M. Sujith* Department of EEE, IFET College of Engineering, Villupuram, Tamilnadu, India ABSTRACT In distribution systems, there will be sudden increase or decreases in the load similar to nonlinear load .The load draws non-sinusoidal currents from the AC mains and these causes the load harmonics and reactive power, and excessive neutral currents that pollute power systems. Most of the power quality issues are created by nonlinear characteristics and fast switching of power electronic devices. A single distribution generation interfacing converters are generally used for harmonic compensation in DG but this may cause amplification of supply voltage harmonics when the system is connected to a sensitive load. In this paper we proposed a compensation strategy in which to shunt interfacing converters are used, first one for voltage harmonic suppression and the second one for current harmonic suppression that resulted due to the interaction between the first interfacing converter and the local nonlinear load Keywords: Voltage Disturbances, Nonlinear Loads, PCC, Power Quality, Shunt Active Power Filter. I. INTRODUCTION The usage of renewable energy resources has popularized due to the increased advantages. The advantages of renewable energy include the low or nil cost of fuel, pollution free, improved efficiency. The great potential of such resources for green energy production has led the technological society to the implementation of a new type of distribution system, the microgrid. There is one major challenge in implementation of distributed generation. For the interfacing of Renewable Energy Resources (RES) to the distributed system requires power electronics devices. Therefore power electronics devices play a vital role in the integration of the Renewable Energy system to the Distributed System which has the advantages of fast voltage and frequency regulation. The major disadvantage of using power electronics devices is that the switching operation of the semiconductors employed in the inverters causes voltage and current harmonic distortion to the grid. This distortion is increased by the nonlinear loads such as transformers, computers, saturated coils and switching operation of the power electronic devices. It is necessary to overcome these issues such as low power efficiency and low power factor. The commonly used harmonic compensation technique includes the passive filters and active power conditioning equipment. The shunt passive filters consist of tuned LC filters and high passive filters are used to suppress the harmonics. It has the disadvantages such as the possibility of resonance, and requirement of tuning, and it can compensate only particular order harmonics for which it is tuned. In order to overcome this, Active power filters are generally used to compensate harmonics. There are various topologies of active power filters has been developed. The active power conditioning equipment such as active power filter, unified power quality conditioner, dynamic voltage regulators are generally used. When a single DG shunt interfacing converter is used for the harmonic compensation there is