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Precise and fast estimation of system frequency during distorted voltage has become the main challenge for phase locked loop (PLL) for wind energy conversion system (WECS). In this paper, moving av...

Smart materials find vital applications in the aerospace industry due to their ability to adapt to surrounding conditions according to design requirements and applicability. Piezoelectric materials are commonly used under the category of smart materials for transducer applications. Among piezoelectric materials, piezo polymer polyvinylidene fluoride (PVDF) is widely used for structural health monitoring (SHM) applications of composite structures, acoustic emission (AE) sensor, accelerometer, strain gauge, pressure sensor, and so on because of its outstanding piezo stress constant ( g 33), piezo strain constant ( d 33), flexibility, and lightweight. In this article, glass fiber-reinforced polymer (GFRP) laminates have been prepared by embedding the PVDF sensor into GFRP for the first time. A detailed study has been done on the behavior and characterization of the PVDF sensor embedded in GFRP. The PVDF sensors embedded in laminates were subjected to impact test, where a constant weight of 5.5 kg was dropped from a height of 10–60 mm in the interval of 10 mm, and the voltage response of the PVDF sensor was recorded. Sensitivity analysis and AE test of the PVDF sensor in GFRP were also carried out. This is useful for various aerospace applications especially for SHM of aircraft.

Polyvinylidene fluoride (PVDF) films possess superior piezoelectric properties due to the β-phase obtained by methods, such as addition of nanofillers, application of high electric field, use of polar solvents and mechanical stretching. Simultaneous stretching and heating of the films can reduce porosity, increase transformation from α-phase to β-phase, and hence, improve their piezoelectric properties. This article presents the effects of stretching PVDF films on the β-phase formation and the resulting mechanical properties. A custom-designed stretching unit with roller mechanism and heating provision was employed for the purpose. The 200% stretched films at 100°C showed 86.79% β-phase, which is in correlation with X-ray diffraction peaks at 2 θ = 20.3–20.6°. Transmission electron microscopy and scanning electron microscopy of the stretched films revealed spherulitic to lamellar transformation and decrease in porosity. Stretching increased crystallinity from 32.99% to 44.84%. Nanoindentation results showed increase in hardness and Young’s modulus from 23.33 MPa to 93.3 MPa and 0.483 GPa to 1.816 GPa, respectively. Tensile strength increased from 4.72 MPa to 21.02 MPa. The experiments were conducted using L9 orthogonal array and the results were analyzed using analysis of variance and gray relational analysis.

One of the emerging optimization techniques formulating on the interest of conflict or cooperation for achieving maximum outcome on the bases of prediction is the Game Theory. From the last two decades, it has gradually been used in wireless communication and slowly stepped into wireless sensor networks. Wireless sensor networks are made up of wireless nodes working on batteries and so the life of the networks depends on the life of the battery. Applying the best cluster-based routing protocol with appropriate game has increased network lifetime, and enhanced its energy efficiencies. Present paper summarizes the literature and the research carried out for the cluster-based routing protocol in wireless sensor network using game theory.

Harmonic-distortion is a serious problem in power systems involving linear and non-linear loads. Adding a passive-filter to the system is the most popular choice to reduce issues due to harmonic distortion. Passive-filter cannot eliminate all the harmonic components. A hybrid-filter, in which shunt active filter is serially integrated with shunt passive filter can provide better solution to the problems causing due to harmonic distortions. The paper proposes a hybrid filter with Artificial Neural Network (ANN) based control scheme. A detailed study is done by developing a Simulink model for the proposed. Here in this paper, % Total-Harmonic-Distortion (THD) of compensated load-current is referred as a performance measure of the system. Also, a controller based on ANN is fabricated for the proposed scheme and through analysis in depth is carried out, this controller performance is found comparatively satisfactory.

Polyvinylidene fluoride (PVDF) receives an increasing amount of attention because of its strong piezoelectric response. PVDF is a highly non-reactive thermoplastic fluoropolymer with high piezoelectric voltage coefficient, wide frequency response, and excellent mechanical properties. A PVDF piezoelectric sensor is very sensitive to dynamic stress and suitable for detecting weak physiological signals. PVDF sensors with varying dimensions and electroding patterns, specific to an application are not easily available commercially. In this paper, the indigenously developed PVDF sensor has been appropriately designed as a sensing element to function as a security alarm for the first time. This sensor can be used at various critical locations of aircraft and for military and industrial areas against theft, damage as well as personal protection, where unwanted or untimely intrusions are to be arrested. The piezoelectric sensor responds immediately to any dynamic stimulus, which may be due to any unwanted episodes, and alerts the authorities. An electronic circuit is designed to support the sensing element, and the output is displayed in the form of glowing of light emission diode (LED) and an audio buzzer.

Soft computing techniques play a basic role in our life from a medical facility to weather forecasting and with the growing up of technology, the importance of soft computing techniques also increases in every field like Artificial intelligence, machine learning, etc. There are different methods to implement soft computing techniques. The use of Soft computing algorithms is one of the best methods to execute soft computing techniques but as speed is the important parameter this issue can be overcome by FPGA. Nowadays FPGA uses to achieve high speed. Due to pipelining concept in FPGA no of parameters of output can be verified simultaneously.

The world is becoming smart as IoT is now an integral part of individuals' routine lives. To control any devices at any place and at anytime from anywhere is now just a matter of access. The goal of this work is to provide simple, efficient, cost-effective, and reliable communication system for traffic management. Keeping in view the aim of smart city, after cleanliness, traffic is the major concern nowadays. A case study is presented through proposed model in this work that will help in improving traffic condition of the city. The available data is analyzed and processed through Raspberry-pi. This data is simultaneously being updated at the web server through cloud. Based on the data available in real time, the system enables controlling traffic system dynamically. This helps in reducing congestion and provides fast going way for heavy vehicular traffic. The system can be clubbed with existing centralized traffic control system in the Indore city to manage traffic conditions in a better way.

In the proposed work, the problem of stabilizing coalition along with optimizing transmission cost for mode selection in D2D communication is considered. We considered a scenario of multiple D2D and cellular links in a single cell, and the D2D link can communicate through any of the three modes of transmission: cellular, reuse and dedicated modes. The proposed solution is based on a coalition game among D2D links for selecting the transmission modes. The joining or leaving of a coalition of a D2D link will be done based on individual transmission costs. The transmission cost is the function of transmission power and the cost of sub-channel occupancy. For stabilizing this coalition game and to get optimized transmission cost, a matching game is implemented between the coalitions and D2D links. A stable coalition means no D2D link can change its transmission mode and have lower transmission cost without making others worse off. We have also presented two cases along with one challenging study case, where we have performed our study with five D2D links and three modes of transmission in a single cell and showed the stable matching with optimized transmission cost.

Modern error controlling codes, like a Low-Density Parity Check (LDPC) codes, assume a significant job in a next-generation wireless system like 5G for improved channel error controlling ability. Execution of Turbo codes(3G), Polar codes(4G) and LDPC (5G) codes are near to Shannon’s limit channel codes and in this manner are being utilized in next-generation wireless communication systems. This paper emphasis around modern cellular cell network, LDPC codes and their performance using EXIT chart is presented. Likewise, a similar exhibition assessment of LDPC codes and the decisions of error controlling codes for the future generation cell systems are talked about in the paper. Such an investigation will be helpful in the choice of legitimate LDPC codes for the next-generation wireless communication system.

Millions of Americans suffer from nervous system injuries. Hydrogels have been investigated to (1) bridge nerve gaps; (2) act as scaffolds for bioactive molecule delivery or cell transplantation; and/or (3) promote axonal outgrowth. In this study, we use a rapid, one-step Michael addition click chemistry reaction to fabricate a hyaluronic acid (HA) scaffold for neural repair. Briefly, some of the primary hydroxyl groups on the HA backbone were modified with vinyl sulfone functional groups for (1) conjugation of thiol based bioactive molecules and (2) hydrogel crosslinking, which was confirmed by proton nuclear magnetic resonance (1H-NMR) and Fourier transform infrared spectroscopy (FTIR). The degree of crosslinking creates a mechanically tunable hydrogel. Rheology confirmed that the storage modulus was within the order of magnitude to that of nervous tissue. Primary human dermal fibroblasts and primary mouse neural stem cells (NSCs) seeded in the HA hydrogel were viable and proliferative, thus demonstrating that the HA hydrogel is suitable as a scaffold for cell transplantation. The range of pore size demonstrated that the scaffold supports cell migration and neurite extension. Neurite outgrowth of cultured whole embryonic day 9 chick dorsal root ganglions signifies that the hydrogel supports axonal outgrowth. Reduction in immune and inflammatory cell viability was observed in the anti-Fas conjugated HA hydrogel, whereas the NSCs maintained viability in the anti-Fas HA hydrogel. Therefore, this one-step, rapid, controllable reaction is an efficient method for fabrication of tunable, biomolecule conjugated hydrogels for neural engineering applications.

This paper presents a study of ultrasonic guided wave sensing performance of poly (vinylidene fluoride–trifluoroethylene) P(VDF–TrFE) thin film sensors. P(VDF–TrFE) thin films show sensitivity to ultrasonic Lamb waves modes similar to conventional PZT wafers. We present a novel guided wave technique to estimate the piezoelectric coefficient e31 of a bonded thin film in situ over ultrasonic frequency band. The technique is very simple that involves the use of the response of thin film and a guided wave propagation model to determine the piezoelectric coefficient at room temperature of 24 °C. The P(VDF–TrFE) thin films show an average e31 values of around 0.0906 C/m2 at various frequencies (60–400 kHz). At various strain levels (0.01–0.02 μe) these films show a constant e31 of 0.0972 C/m2. The proposed technique is capable of characterizing the thin film sensors in a non-destructive way and in situ, which helps in their calibration procedure. The study also provides an important insight towards optimized frequency range and sensitivity of newly developed P(VDF–TrFE) thin film for ultrasonic applications.

This paper presents the loss in piezoelectric performance of piezopolymer film sensors like PVDF and P(VDF-TrFE) and P(VDF-TrFE)/ZnO nanocomposite thin films due to thermal exposure. Changes in the material structure through XRD diffraction analysis reveal the high stability of P(VDF-TrFE) and P(VDF-TrFE)/ZnO nanocomposites films after subjecting to thermal exposure above 120 °C. Loss in the crystalline β-phase of PVDF film was observed after thermal exposure above 80 °C accompanied by shrinkage. Loss of crystalline β-phase is lesser in constrained films as compared to free films. Next, the piezoelectric coefficient d33 measured using dynamic force method suggests highest stability of PVDF film at higher temperature as compared to P(VDF-TrFE) and P(VDF-TrFE)/ZnO nanocomposite thin film. In addition, the constrained PVDF film shows better stability of piezoelectric coefficient d33 than the unconstrained PVDF films. Using the guided wave the piezoelectric coefficient d31 of these films was measured. Among these films, PVDF films show excellent stability in the piezoelectric coefficient d31 when subjected to thermal exposure. P(VDF-TrFE) and P(VDF-TrFE)/ZnO thin films retain piezoelectricity up to 90 °C, whereas PVDF films retain piezoelectricity up to 120 °C.

Nanocomposites of piezoelectric PVDF doped with Cd0.99Eu0.01SiO3 of varying concentration was prepared by spin coating technique. The prepared nanocomposites were investigated by X-ray diffraction technique and it showed an α to β transformation compared to pristine PVDF. This phase exhibits piezoelectric property employed in the design of Sensors and Actuators. SEM micrographs indicated a modification in surface morphology of the nanocomposites. Results of EDX indicate the incorporation of the elements of the nanodopant in PVDF. Differential Scanning Calorimetry showed an increase in degree of crystallinity. Optical bandgap energy of the nanocomposites increased with increase in concentration of nanodopant. Dielectric studies showed an enhancement in Dielectric permittivity and AC conductivity of the nanocomposites which can be employed in the design of energy storage devices

This paper reviews the potential of polymer and ceramic matrix composites for aerospace/space vehicle applications. Special, unique and multifunctional properties arising due to the dispersion of nanoparticles in ceramic and metal matrix are briefly discussed followed by a classification of resulting aerospace applications. The paper presents polymer matrix composites comprising majority of aerospace applications in structures, coating, tribology, structural health monitoring, electromagnetic shielding and shape memory applications. The capabilities of the ceramic matrix nanocomposites to providing the electromagnetic shielding for aircrafts and better tribological properties to suit space environments are discussed. Structural health monitoring capability of ceramic matrix nanocomposite is also discussed. The properties of resulting nanocomposite material with its disadvantages like cost and processing difficulties are discussed. The paper concludes after the discussion of the possible future perspectives and challenges in implementation and further development of polymer and ceramic nanocomposite materials.

Piezoelectric polymer nanocomposites are prepared to improve the dielectric properties of polyvinylidene fluoride (PVDF) as micropower generators. Polyaniline (PANI) was chosen as a filler material to prepare the nanocomposites. PVDF-PANI nanocomposite films were prepared using the solvent cast method with different volume fractions of PANI varying from 0.04 to 0.06%. The films were then characterised for structural, mechanical and surface morphological properties using X-ray diffraction, differential scanning calorimeter, Raman spectra, Infrared spectra, tensile testing and scanning electron microscopy. X-ray diffraction analysis shows that the prepared PVDF-PANI films were in beta-phase. DSC scans indicate that the degree of crystallinity in PVDF-PANI has improved. Raman and Infrared spectrum further confirm the presence of beta-phase in PVDF-PANI film. Tensile properties of PVDF-PANI films show good mechanical properties. The surface feature shows that PANI is uniformly distributed in PVDF and also results in the disappearance of spherulites. The influence of volume fractions of PANI in PVDF on the dielectric properties were analysed. The results showed that the dielectric permittivity of PVDF-PANI (137.36) was much higher than that of PVDF (12). The sensitivity of these films were studied by the application of pressure, and it was observed that the voltage response of the film sensor is 12.4 V pk–pk, which is steady with the constant application of 1.85 kg weight. PVDF-PANI film sensor shows higher sensitivity with a longer period of time. These films were tested to use as micropower generators when coupled with supercapacitors.

Sewing cuffs incorporated within tissue-engineered blood vessels (TEBVs) enable graft anastomosis in vivo, and secure TEBVs to bioreactors in vitro. Alternative approaches to cuff design are required to achieve cuff integration with scaffold-free TEBVs during tissue maturation. To create porous materials that promote tissue integration, we used electrospinning to fabricate cuffs from polycaprolactone (PCL), PCL blended with gelatin, and PCL coated with gelatin, and evaluated cuff mechanical properties, porosity, and cellular attachment and infiltration. Gelatin blending significantly decreased cuff ultimate tensile stress and failure strain over PCL alone, but no significant differences were observed in elastic modulus or failure load. Interestingly, gelatin incorporation by blending or coating did not produce significant differences in cellular attachment or pore size. We then created tissue tubes by fusing self-assembled smooth muscle cell rings together with electrospun cuffs on either end. After 7 days, rings and cuffs fused seamlessly, and the resulting tubes were harvested for pull-to-failure tests to measure the strength of cuff-tissue integration. Tubes with gelatin-coated PCL cuffs failed more frequently at the cuff-tissue interface compared to PCL and PCL:gelatin blended groups. This work demonstrates that electrospun cuffs integrated successfully with scaffold-free TEBVs, and that the addition of gelatin did not significantly improve cuff integration over PCL alone for this application. Electrospun cuffs may aid cannulation for dynamic culture and testing of tubular constructs during engineered tissue maturation. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 817-826, 2018.

The rapid advancement in communication systems and Internet of Things (IOT) has increased the demand for high data rates, reliability, better Quality of Service (QoS), and reduced interference. As the upcoming 5G aims to accommodate more number of users in the limited available spectrum, Non-Orthogonal Multiple Access (NOMA) outperforms the accommodation of users on the channels. In this paper, an algorithm to optimize the uplink power allocation of the user pairs in NOMA for the two-user system model is discussed. Typically, NOMA uses same frequency slot, same time slot, but different power levels to transmit user’s data, resulting in higher spectral efficiency. Successive interference cancellation is the major challenge in this scheme, which is enhanced with proper selection of power levels at which the users transmit the data. The optimum power allocation in NOMA can be modeled as a game in which Evolutionary Game Theory (EGT) helps the Base Station (BS) to provide the best optimal power level for the user pair to transmit their message signals simultaneously on the same channel under the profound channel conditions and position of that user pair in the cell. It is shown that EGT is a successful tool in deciding power levels of participating mobile stations.

DC Electric motors convert nearly half of the worldwide electric energy into mechanical energy. In many industrial applications DC motor finds a good place for variable speed and versatile operations due to its easy controllability. This paper deals with the energy conservation for a separately excited DC motor by applying speed control technique. The experimental setup is established for the system and speed control is carried out through variable armature input voltage using firing angle control.

Voltage Source Inverters (VSI) and Current Source Inverters (CSI) are very widely fit for industry. VSI have limited output AC voltage and requirement of a blanking time whereas Current Source Inverters always boost up the voltage and their use are restricted for drive applications. To overcome these limitations Impedance Network or Z-Source Inverters (ZSI) are utilized. Ideally Z-Source Inverters are the ones which have output voltage ranging from zero to infinity. This Buck-Boost capability along with regeneration in single stage configuration makes these inverters ideally suited for hybrid electric vehicles and drive applications. The rotor side power of an induction generator can be utilized by slip power recovery (SPR) controlled technique based on (ZSI). This paper presents the design of ZSI for improving the voltage level of SPR. The system of ZSI is simulated using MATLAB-Simulink platform and the pulse width modulation (PWM) for the inverter is generated using DSPIC microcontroller.

The presented work in the paper shows a comprehensive analysis of fractional-order PI (FOPI) controller based voltage and frequency (VF) control of variable speed hybrid-standalone wind-energy-conversion-system (WECS). The system comprises of two major components: (1) permanent-magnet-synchronous-generator (PMSG), (2) battery-energy-storage-system (BESS). For standalone operation, the frequency and magnitude of voltage need to be controlled at the load terminals. DSOGI-PLL (Dual-second-order-generalized-integral based phase-locked-loop) is designed to track the frequency of the system. Fractional-order (FO) controllers provide robustness to Voltage Source Converter (VSC) due to their fractional characteristic. FOPI (PIλ) controller has an extra degree-of-freedom λ (order of integral) with its proportional gain (Kp) and integral gain (Ki). Simulation analysis is carried out in MATLAB/Simulink for PMSG-BESS based WECS. Proposed controller’s performance is evaluated for varied conditions of operation. FOPI based controller is significantly minimizing the peak overshoot and settling time for the terminal voltage, also it improves the transient response of the system.

In order to extract the maximum volume of sun’s radiated energy maximum power point tracking has to be s elected. Due to the obstructions like clouds , ozone layer and on the other hand changes in the climatic conditions such as, water vapor, reflection, absorption and pollution makes the photo voltaic (PV) panel to generate less energy without the maximum power point (MPP) technique. So, in order to gain the highest power from the PV array, even in the extreme conditions, maximum power point incremental conductance (INC) algorithm, Fuzzy (FL) logic controller and Artificial neural network (ANN) techniques are implemented and their performance is analyzed in this paper. These techniques provide efficient power output when compared to ideal PV panel system. Their response is developed in MATLAB/Simulink environment.

Central nervous system (CNS) injuries and diseases result in neuronal damage and loss of function. Transplantation of neural stem cells (NSCs) has been shown to improve locomotor function after transplantation. However, due to the immune and inflammatory response at the injury site, the survival rate of the engrafted cells is low. Engrafted cell viability has been shown to increase when transplanted within a hydrogel. Hyaluronic acid (HA) hydrogels have natural anti-inflammatory properties and the backbone can be modified to introduce bioactive agents, such as anti-Fas, which we have previously shown to promote NSC survival while suppressing immune cell activity in bulk hydrogels in vitro. Although bulk HA hydrogels have shown to promote stem cell survival, microsphere gels for NSC encapsulation and delivery may have additional advantages. In this study, a flow-focusing microfluidic device was used to fabricate either vinyl sulfone-modified HA (VS-HA) or anti-Fas-conjugated HA (anti-Fas HA) microsphere gels encapsulated with NSCs. The majority of encapsulated NSCs remained viable for at least 24 h in the VS-HA and anti-Fas HA microsphere gels. Moreover, T-cells cultured in suspension with the anti-Fas HA microsphere gels had reduced viability after contact with the microsphere gels compared to the media control and soluble anti-Fas conditions. This approach can be adapted to encapsulate various cell types for therapeutic strategies in other physiological systems in order to increase survival by reducing the immune response. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 608-618, 2017.

Software Defined Networks (SDN) provides central control over the network and the commands can be applied on its controller and switches through the interfaces. It has a central element, called as controller that maintains records and controls over the entire network activities. Hence, it is necessary to protect the controller, from being unreachable to the hosts that are connected to it. The unavailability of the controller can result in Denial of Service (DoS)/ Distributed Denial of Service (DDoS) attack. This paper presents the utility of the central controlling facilities to detect attacks and to mitigate them using an easy approach which can be implemented on the controller. The approach is based on the concept of entropy which is an important statistic of an SDN is its entropy. By observing the variation in the entropy, the attack on the controller can be detected before the controller becomes unreachable. Simulations and numerical results show the effectiveness of the proposed method in detecting and preventing DDoS attacks at an early stage.

The mobile communication industry around the globe is striving for new technologies as future wireless cellular systems are necessary to provide higher user data rates and offer smooth user access to the backbone communication network. The efficient data compression methods and error correcting codes are two of the most prominent approaches that ease applications in the overhead-mentioned systems and services. The major focus of this paper is on the performance analysis of turbo compressive codes using EXIT charts. The major advantages of the EXIT chart technique are the fact that they can be computed quickly, making it much more convenient than the traditionally simulated BER performance curves. Furthermore, the EXIT charts are a powerful technique which allows analyzing the constituent decoders in an iterative decoder separately.

The variable-speed Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion System (WECS) attracts the maximum power from wind, but voltage-regulation and frequency-control of the system in standalone operation is a challenging task A modern-control-based-tracking of power from wind for its best utilization is proposed in this paper for standalone PMSG based hybrid-WECS comprising Battery Energy Storage System (BESS). An Adaptive Synchronous Reference Frame Phase-Locked-Loop (SRF-PLL) based control scheme for load side bi-directional voltage source converter (VSC) is presented for the system. MATLAB/Simulink model is developed for simulation study for the proposed system and the effectiveness of the controller for bi-directional-converter is discussed under different operating conditions: like variable wind-velocity, sudden load variation, and load unbalancing. Converter control scheme enhances the power smoothening, supply-load power-matching. Also it is able to regulate the active & reactive power from PMSG-BESS hybrid system with control of fluctuations in voltage & frequency with respect to varying operating conditions. Proposed controller successfully offers reactive-power-compensation, harmonics-reduction, and power-balancing. The proposed scheme is based on proportional & integral (PI) controller. Also system is experimentally validated in the laboratory-environment and results are presented here.

3-phase PLL (phase-locked-loop) are the key elements for frequency & phase estimation of a balanced/disturbance voltage of the power system subjected to disturbances. Accurate measurement of generator speed in wind energy conversion system (WECS) is the most crucial task and it is worsening in disturbed voltage states. A dual-second-order-generalized-integrator (DSOGI)-PLL based control for load side bidirectional voltage source converter (VSC) is discussed in this paper for standalone hybrid variable speed WECS comprising of permanent magnet synchronous generator (PMSG) and & battery energy storage system (BESS). DSOGI-PLL based control scheme is presented here for voltage and frequency control. A MATLAB/Simulink-model is prepared for the system under study and a detailed simulation is performed. The effectiveness of the controller under study is checked by comparing it with Adaptive frequency loop-PLL based controller for different working conditions; like variable wind velocity, load variation, load disturbances, and faults. It is concluded from the simulation study that DSOGI-PLL gives comparative better performance during transient like: fault and unbalanced/disturbed voltage conditions. DSOGI-PLL removes the harmonics and disturbances from the signal (dq-axis component generation) as compared to Adaptive frequency loop-PLL. Proposed controller provides excellent control for VSC. BESS is able to perform load balancing during variations in wind-velocity and load.

The wind turbine efficiency increases by controlling the rotor speed to its optimal value. A nonlinear controller, which is robust towards uncertainties in the dynamic plant model and unknown disturbances, is designed for better capture of rotor speed. This paper focuses on an effective wind speed based complementary sliding mode controller (CSMC) designed for wind turbine. The main objective of the controller is to extract the maximum power from wind at region 2 (below rated wind speed) with minimum oscillation on the drive train. The controller stability is validated by Lyapunov function. The proposed and existing control algorithms are validated using a FAST 600kW model which is developed by NREL (National Renewable Energy Laboratory). The efficacy of the proposed controller is validated by comparing it with typical nonlinear controller such as sliding mode and integral sliding mode controller. A detailed simulation is performed for typical and proposed control strategies for different mean wind speed profiles. The simulations results shows that, complementary sliding mode controller gives better performance than typical control strategies.