A Control Topology for Regulating Power, Voltage and Frequency of PMSG based Wind Energy Conversion System

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A Control Topology for Regulating Power, Voltage and Frequency of PMSG based Wind Energy Conversion System

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Mrs. P. T. Supriya Assistant Professor Department of EEE

Gnanamani college of Engineering Namakkal, Tamilnadu.

Dr. R. Prakash Professor Department of EEE

Muthayammal Engineering college Rasipuram, Tamilnadu

Abstract:- The global need for cheap environment friendly energy generation has grown over recent decade due to the depletion of fossil sources. Considering the needs of future generation, renewable sources are the main focus of research work in recent decades. Compared to other sources wind energy is found to be one of the preferred alternative for many power corporation. But because of the random and erratic nature of wind some mean of control strategy must be developed in order to extract as much power as possible. Therefore in this paper a Hill-climb search (HCS) algorithm is implemented which can efficiently track the optimum power point at fast varying wind condition and also demonstrates battery connected operation for an independent wind energy conversion system (WECS). The hill-climb search algorithm is independent of the wind turbine power-speed characteristics and the wind speed hence it is a sensor less approach. Here the wind speed is changed in step wise manner and the maximum power is tracked using the HCS algorithm in SIMULINK based environment. Thus a variable speed operation is obtained from the permanent magnet synchronous generator (PMSG). Due to variable speed operation and variation of load (due to fault and overload condition) leads to huge oscillation and variation in the grid frequency and voltage waveform. Hence a voltage-frequency (VF) controller is designed to bring down the change in voltage and frequency into permissible limit. The VF controller is operated by a voltage source converter (VSC) and hybrid battery storage system. The VF controller regulates the active and reactive power supplied by battery and the generator and controls voltage and frequency fluctuation. In order to verify the proper working of the VF controller different load disturbances are introduced to the WECS and the voltage and frequency of the three-phase three- wire connection system are monitored regularly in a MATLAB based SIMULINK environment.

Keywords: MATLAB,WECS,HCS,VSC,VF controller

I. INTRODUCTION

Due to the increasing environmental concern the old ways of power generation by burning fossil fuel has been substituted by much suitable and environment friendly renewable sources. Scientists have predicted that there is only a limited amount of fossil fuels in the earths crust and it is going to deplete within 30-50 years. So, we need to come up with some other viable and more effective alternative which lead to increased focus on renewable sources. Wind energy is safe, inexhaustible, environment friendly and is capable of supplying growing energy

demand. But, due to the erratic nature of wind a smart control strategy have to be designed to capture power equivalent to the theoretical limit. Explorations in the field of maximum power from wind conversion system has been a crucial part in transforming wind energy a preferred alternative in energy industry.

Energy Conversion Principle for Wind TurbineMaximum Power Point Extraction ConceptVoltage and Frequency Control ActionII.a.Wind TurbineHorizontal Axis Wind TurbineVertical Axis Wind TurbineII.b.Synchronous GeneratorIII.a.SVPWM TheoryPWM InverterPulse Width Modulation (PWM) GeneratorIII.b. POWER OPTIMIZATION TECHNIQUE(i)Tip speed ratio (TSR)(ii) Power signal feedback (PSF)(iii) Hill climb search (HCS)(i) The Implemented MPPT technique(ii) MPPT Control Algorithmm=OVERALL WECS MODELVF CONTROLLER MODELMPPT CONTROL RESULTVOLTAGE FREQUENCY CONTROL RESULT

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