International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Implementation of an 11 level inverter with FACTS capability for Distribution Energy Systems Jerila J, Mr. Almond D Souza ME Scholar, Dept. of Electrical Engineering, St. Xavier’s Catholic College of Engineering, Tamil Nadu, India Asst. Professor, Dept. of Electrical Engineering, St. Xavier’s Catholic College of Engineering, Tamil Nadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This paper introduces a new single phase
multilevel inverter which has FACTS capability (Flexible AC Transmission system) so that the use of FACTS devices can be reduced. This new single phase multilevel inverter is placed between the wind plant and the distribution system to regulate the active power and reactive power to the grid. This designed inverter itself acts as a FACTS device to regulate the power factor of the feeder lines. This proposed inverter will eliminate the use of capacitor banks and FACTS devices and it itself provides reactive power compensation and can be used for small wind applications. Thus it reduces the cost of the system and increases the penetration of renewable energy system into the distribution system. In this paper a new single phase half bridge eleven level inverter is designed to meet all the IEEE standards. This proposed eleven level inverter regulates the active and reactive power to the grid and is cost effective. This implemented eleven level inverter is designed and its simulation are done in MATLAB/Simulink. Key Words: Multilevel Inverter, eleven level, cascaded, wind, sinusoidal pulse width modulation ,FACTS devices, capacitor banks
1. INTRODUCTION The power electronics plays a major role in our day to day life. There is not even a device running in our homes without power converter devices encrypted in them. Thus the use of power converter devices is greatly increased. These power converter devices can be used for converting any non conventional source of energy in to voltage and frequency which is suitable for the distribution system. In case of wind applications a back to back converter is used for connecting the generator to the grid. The wind plant consists of a rectifier and MPPT(Maximum Power Point Tracking). Here the rectifier equipped with MPPT converts the ac output power of the wind turbine into dc. Now an inverter can be used which is used for converting the dc output into ac suitable for the grid. Now a days the need for using wind energy inverter with greater efficiency has become a great deal. For a lossless and a high efficiency system .high power factor is necessary. A high power factor decreases the power losses and increases the voltage regulation to the load. The work of the reactive © 2017, IRJET
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power elements is to supply or absorb the reactive power so that the harmonics and losses are reduced. This also reduces the apparent power. If the reactive power compensation is performed then voltage regulation can be improved. For small wind applications normally permanent magnet synchronous motors are used. The doubly fed induction generators can also be used for large wind applications. The permanent magnet synchronous motor works on the principle of magnetic locking. The output of the generator is given to the wind turbine. Here it is connected to the rectifier with MPPT. Traditionally capacitor banks are used to compensate the power factor and to provide reactive power compensation .But these capacitor banks increase the cost of the system. Also FACTS devices like DSTATCOM (Distribution Static Synchronous Compensators) are used for reactive power compensation. These devices are placed in parallel with the distribution system and operates as a source or sink of reactive power. These FACTS devices increases the cost of the system. So we opt for the new wind energy inverter with FACTS capability for being cost effective and to meet IEEE standards.
2. PROPOSED SYSTEM For use in distribution energy systems an 11 level inverter is introduced. This inverter which is a combination of inverter and DSTATCOM is placed between the wind turbine and the grid. This inverter regulates the active power and the reactive power to the grid and is cost effective. MODE 1 •
When there is wind ,the active power is generated from the turbine so inverter + DSTATCOM mode
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In this mode, the device is works as a regular inverter to transfer active power from the renewable energy source to the grid as well as it works as a normal DSTATCOM to regulate the reactive power of the grid in order to control the PF of the grid.
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