Arunava Chatterjee

Performance evaluation of single phase self excited wind generator using three phase machine

This paper presents performance evaluation of an improved low cost single phase self excited induction generator (SEIG) using a three phase machine. This machine can be used in grid isolated and remote areas as a portable source of power supply. The reactive power requirement for this type of generator is provided through a single capacitor of suitable value and a single phase inverter with a photovoltaic (PV) module which acts as a dc bus to the inverter. The inverter along with the PV module acts as a variable source of excitation during the variable load and wind speeds which aid in providing stable load voltage with fixed frequency. Performance of such a generation scheme is analyzed using suitable simulations and experiments. The scheme shows encouraging results and thus also validates the proposed strategy.

Photovoltaic assisted excitation control of 1-phase dual winding induction generator for wind-based microgeneration

Off-grid power generation from renewable source like wind has been a topic of recent research. This paper proposes a simple control strategy for single phase, dual stator winding induction generator for grid secluded, domestic application. The induction generator consists of a control winding fed from a Photovoltaic (PV) panel and single phase inverter. A storage battery is used which adds to the reliability of the scheme. The load is fed from the power winding. The two windings are decoupled from each other which make the control flexible. The proposed control accounts for steady load voltage with constant frequency operation with change in loads or rotor speeds. The proposed generation scheme along with the control is made uncomplicated keeping in mind the cost requirement and effectiveness. Suitable simulation and experimental analysis sums up the viability of the proposed concept.

Development of low cost single phase self excited wind generator using three phase machine

Conventional three phase induction generators connected to wind turbines are extensively used nowadays for providing grid connected as well as isolated loads. This paper presents an enhanced low cost single phase self excited induction generator (SEIG) using a three phase machine. Reactive power for such an induction generator is provided partially through a fixed capacitor and strategically through an inverter for constant voltage and frequency operation. This dc source is a photovoltaic (PV) module connected to the inverter input. Appropriate experimental and simulation results validate the proposed strategy.

Adaptive Fuzzy—Sliding Mode Control with Fixed Bias Compensator for an Electrohydraulic Actuation System with Hard Nonlinearities

An adaptive fuzzy sliding mode controller with fixed bias compensator is designed in this paper to address the issue of position control of an electrohydraulic actuation system. The adaptive fuzzy sliding mode controller approximately compensates for the system nonlinearities and minimizes the approximation errors. In order to attenuate the effects of discontinuous nonlinearities, the fixed bias compensator is introduced. The adaptation scheme is based on the Lyapunov function of the sliding function variable drawn up with Hurwitz coefficients, thereby ensuring the closed loop stability and convergence. Real time experiments conducted on an existing electrohydraulic laboratory set up comprising of a proportional valve and a single-rod cylinder evince that the proposed control method is robust for diverse range of demands.

A novel hybrid wind generation scheme suitable for varied speed grid isolated installations

Generation of electrical power from wind is much advantageous due to its clean nature and abundance. This paper presents a wind generation scheme which uses two wind generation sources. The first source is a permanent magnet synchronous generator (PMSG) operating in maximum power tracking mode. The other source is a single-phase dual stator winding induction generator (DWIG). The two machines are connected together with the help of rectifier and a common DC bus. The hybrid wind generation configuration thus obtained can harness wide range of wind speeds for generation purpose and can sustain single-phase isolated domestic loads. Provision of storage is kept using a suitable storage battery during surplus energy available. Additionally, photovoltaic (PV) panel can be added across the DC bus for generation and sustaining loads during no wind. The control of the two generators with PV panel is studied in the paper. The simulation results obtained, backed by the experimental findings validates the proposed concept.

Visual sensing based adaptive sliding mode control of position tracking in electrohydraulic systems

This study focuses on the issue of position tracking of a budgeted electrohydraulic system with the aid of marker based visual sensing of the actuator rod position using a single camera. The system comprises of a single-rod cylinder having non-linear friction characteristics and industry grade proportional valve possessing a large-deadband. A controller has been developed based on an input linearized system model involving the combination of a sliding mode and a deadband controller. An adaptive strategy for the controller parameters relying on a Lyapunov function has been introduced to handle the nonlinearities and uncertainties involved in the system. The controller demonstrated satisfactory performance for the realtime experiments conducted on the laboratory scale system.

A current signature based stator main winding fault detection technique for single-phase induction machine

This paper presents a simple, cost-effective technique of stator winding inter-turn fault detection that is applied to a single-phase induction machine while in operation. The technique emphasizes on sensing the stator current of the induction motor and analyzing the current for detecting the fault. The technique is minimalist and uses less number of sensors and thus cost-effective and can also be easily implemented. The technique is also non-invasive and thus less intricate. The proposed scheme can be used on-line for fault diagnosis. Experimental studies on a machine with main winding inter-turn fault and comparison of the findings with a healthy machine of similar ratings shows the effectiveness of the proposed method.

An economic microwind-generation scheme using single-winding induction machine

This paper presents an economic single-phase, microwind-generation scheme at low wind speeds mainly for grid-isolated, domestic applications. The generation scheme employs a single-phase induction machine to operate as an induction generator using only one stator winding with higher number of poles. Besides fixed capacitors, a closed loop excitation current control scheme for the single winding is provided through a dedicated inverter assisted from a photovoltaic source. A transformer is used to step up the voltage generated at the winding terminals. The scheme shows excellent performance providing constant voltage output with changing loads when simulated and practically experimented with a practical 200W, 230V, 12-pole machine.

A Photovoltaic-based Improved Excitation Control Strategy of Three-phase Self-excited Induction Generator Suitable for Wind Power Generation

Abstract—Self-excited induction generators are extensively used for wind power generation in remote and grid-isolated areas. It is challenging to maintain constant voltage and frequency under variable loads and variable wind speed conditions for such kinds of generators. This article proposes a hybrid reactive power control technique for induction generators through a fixed capacitor bank connected at the stator terminals and a strategically switched inverter source. The inverters DC bus is connected to a photovoltaic panel and a storage battery. This scheme provides stable voltage output with changing loads and widely varying wind speeds. The capacitor provides the bulk excitation current for the induction generator, while the inverter provides the additional reactive current desired to regulate the generator output voltage under variable wind speeds and variable loads. Suitable simulations and experiments validate the proposed concept.