A novel control strategy for a variable speed wind turbine with a permanent magnet synchronous generator

This paper presents a novel control strategy for the operation of a direct drive permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine. The control strategy for the generator side converter with maximum power extraction is discussed. The stand alone control is featured with output voltage and frequency controller capable of handling variable load. The potential excess of power is dissipated in the damp resistor with the chopper control and the dc link voltage is maintained. Dynamic representation of dc bus and small signal analysis are presented. Simulation results show that the controllers can extract maximum power and regulate the voltage and frequency under varying wind and load conditions. The controller shows very good dynamic and steady state performance

A simple maximum power point tracking based control strategy applied to a variable speed squirrel cage induction generator

This paper presents a comprehensive modelling and control study of a variable speed wind energy conversion system based on a squirrel-cage induction generator (SCIG). The mathematical model of the SCIG is derived in Park frame along with the indirect field oriented control (IFOC) scheme based on a proportional and integral speed controller. A simple maximum power point tracking strategy is used to determine the optimal speed under variable wind speed conditions which is then used as the reference in the IFOC scheme. Power flow between the supply and the inverter is regulated via simultaneous control of the active and reactive currents of the grid and the DC link voltage. The simulation results show that the proposed control technique is able to maximise the energy extracted from the wind during the simulation scenarios considered. The results also demonstrate good transient response characteristics in the decoupled real and reactive powers.Peer reviewedFinal Accepted Versio

Protection and energy management of zero net electric energy clusters of buildings

This paper proposes the protection and energy management schemes for a smart dc micro-grid capable of 100% autonomous zero net energy in the cluster of buildings to facilitate a low-carbon sustainable electricity supply system. The proposed model comprises of house clusters with an autonomous communication developed for the residential area. Voltage droops and slope compensation peak current mode control techniques are employed for the bidirectional synchronous boost converter stages for energy storage systems (ESSs). The zone relaying device pertaining to dc protection is incorporated under set of rules related to current differential and overt current relaying schemes. The bidirectional converter stage for house clusters plays a pivotal role in stand-alone operation. In case a battery pack is laid off from any house cluster, the dc bus voltage still be stabilized due to the proximity bidirectional converter stages of other house clusters or community battery bank. The houses in the cluster comprise of permanent magnet synchronous generator (PMSG), solar photovoltaic (PV), battery bank and variable load. The proposed model is simulated on MATLAB/ Simulink environment and suffices the real time stochastic nature of wind, solar and load

An Advanced Control Strategy for an IPM Synchronous Generator Based Wind Turbine

This work proposes an direct control procedure for an inside permanent magnet synchronous generator-based variable speed wind turbine. In this plan, the necessity of the constant rotor position is dispensed with as every one of the counts are done in the stator reference outline. This plan has favorable circumstances, for example, lesser parameter reliance and lessened number of controllers contrasted and the customary backhanded vector control conspire. The immediate control conspire is more straightforward and can dispose of a portion of the downsides of customary circuitous vector control plot. The proposed control plot is executed in MATLAB/SimPower Systems and the outcomes demonstrate that the controller can work under consistent and shifting breeze speeds. At long last, a sensor less speed estimator is actualized, which empowers the breeze turbine to work without the mechanical speed sensor. The recreation comes about for the sensor less speed estimator are exhibited

Fluctuations Mitigation of Variable Speed Wind Turbine through Optimized Centralized Controller

A wind energy conversion system (WECS) including a variable wind turbine in grid-connected mode is considered to control. In this paper, each component of WECS model is systematically presented and then the integrated overall model is validated.Regarding to nonlinear nature of WECS and the complex system structure as multiple-input multiple-output (MIMO), it is difficult to find a proper control strategy. To simplify the control design, a centralized controller, which is compatible with systematic modelling, is employed. In addition, to enhance the centralized controller performance, an optimization based on genetic algorithm (GA) is accomplished. Simulation results demonstate the effectivesness of the proposed control startegy to mitigation fluctuations

FREQUENCY CONTROL SCHEME USING INTEGRATED GRID INVERTER FOR WIND MILL

Wind is a copious vital source of energy which is complimentary and a fabulous gift of Mother Nature. The escalating levels of wind generation have resulted in an urgent appraisal of their impact on frequency control of power system. Despite the consequences of wind turbine technology, The main intention of this paper is to counterpart the generated frequency from the existing system along with the GRID side frequency which has an unremitting variation due to the loads connected besides the GRID. This frequency disparity is the major concern in today's renewable energy system and is particularly true in portable wind mill applications connected with the grid. So a frequency control scheme using integrated grid inverter for such wind mill applications is being discussed in this paper

Development of DC voltage control from wind turbines using proportions and integrals for three-phase grid-connected inverters

This research article presents the method to control the DC voltage of the boost converter by using a proportional-integral (PI) controller. With AC voltage from a wind turbine generator, converting to DC voltage level by rectifier, this DC voltage controlled by PI controller is to control boost converter that sends DC links to the inverter which converting alternating current voltage to direct current voltage through three-phase load and to the grid-connected system. For switching the IGBTs in the inverter, the PWM signal, on the hysteresis current control, is controlled by the signal from the detected reference voltage based on the grid-connected system and the voltage from a wind turbine generator. The tests made the comparison of results from the simulation with the MATLAB/Simulink program and result from the hardware on the prototype. The power quality results, such as harmonic, power factor, are in acceptable ranges