Performance Analysis of Self Excited Induction Generator Based Stand-Alone Wind Energy Conversion System

The wind energy system is rapidly developing as one of the most favourable renewable energy sources in the present scenario. Due to the constant research in the field of wind energy related technology and generic growth in power electronics system, wind power generation becomes simpler and economical. For low power wind energy system, SEIG is a good choice as a wind power generator. It has lower cost compared to other generator, lower maintenance demands and natural protection against short circuit. The project mainly focuses on the dynamic analysis and modelling of self-excited induction generator used for low power wind energy system. A wind turbine emulator model using torque imitation scheme is developed to drive the IG using MATLAB/Simulink environment. WTE gives the real characteristics as of a wind turbine for better analysis of SEIG under roof. The dynamic performance of SEIG is carried through Simulink and the validation of the Simulink results are established by experiment

Perancangan dan Pembuatan Generator Fluks Radial Tiga Fasa Magnet Permanen Kecepatan Rendah

Based on wind speed data from Meteorology and Geophysics Agency, Indonesia has an average wind speed of about 3-6 m / s. Wind speed can be categorized at low wind speed. So the power station needs a low-speed generator. One solution found from this problem is the development of low speed power plant technology. The wind power plant has an important component of which is a generator which is an electric machine that convert mechanical energy into electrical power. By utilizing a low speed and high torque of the direct drive system of the wind turbine. In designing this low-speed generator the magnetic field is made of neodynium magnets. The generator is designed with a speed of 750 rpm, frequency 50 Hz, induced voltage 15 V and 3 phase. Permanent magnet used with a diameter of 20mm and 3mm thick. The tests included zero load testing, load testing, anchor resistance testing, short-circuit testing and calculating voltage regulation. At the load-bearing load and weightless testing there is a decrease in stress due to the load, where the voltage regulation at the R phase is 16.1%, the S phase is 16.8% and the T phase is 13.2%. The yielded generator voltage phase S is 10.1 Vac, voltage phase R is 10.2 Vac, and then voltage phase T is 10.3 Vac

An Approach to the Design and the Interactions of a Fully Superconducting Synchronous Generator and Its Power Converter

The design of a fully superconducting wind power generator is influenced by several factors. Among them, a low number of pole pairs is desirable to achieve low AC losses in the superconducting stator winding, which greatly influences the cooling system design and, consecutively, the efficiency of the entire wind power plant. However, it has been identified that a low number of pole pairs in a superconducting generator tends to greatly increase its output voltage, which in turn creates challenging conditions for the necessary power electronic converter. This study highlights the interdependencies between the design of a fully superconducting 10 MW wind power generator and the corresponding design of its power electronic converter. © 2022 by the authors. Licensee MDPI, Basel, Switzerland

Design of a micro-scale wind turbine with horizontal axis using airfoil NACA 4412

The high demand for electrical energy leads to the depletion of fossil fuel reserves. Therefore, alternative energy is required to overcome the scarcity of fossil fuels. Regardless of the fact that natural resources are renewable as alternative energy such as wind, water, ocean waves, and sunlight. Wind on the south coast of Malang, Indonesia provides good potential as alternative energy. The design in this paper is focused on designing a horizontal axis wind turbine with 4 blades with a length of 50 cm utilizing the NACA 4412 Airfoil profile. The wind turbine is designed utilizing a low-speed permanent magnet generator around 500-1000 rpm to produce a design power of 100-125 Watt and the maximum power of the generator of 270 Watt. The wind turbine that has been designed has a tower-shaped support that uses iron pipes and is pulled by 4 steel ropes that are plugged in each pointing to the 4 cardinal directions

A novel optimum tip speed ratio control of low speed wind turbine generator based on type-2 fuzzy system

Variable speed control of wind turbine generator systems have been developed to get maximum output power at every wind speed variation, also called Maximum Power Points Tracking (MPPT). Generally, MPPT control system consists of MPPT algorithm to track the controller reference and generator speed controller. In this paper, MPPT control system is proposed for low speed wind turbine generator systems (WTGs) with MPPT algorithms based on optimum tip speed ratio (TSR) and generator speed controller based on field oriented control using type-2 fuzzy system (T2FS). The WTGs are designed using horizontal axis wind turbines to drive permanent magnet synchronous generators (PMSG). The simulation show that the MPPT system based optimum TSR has been able to control the generator output power around the maximum point at all wind speeds

Opportunities for and challenges to further reductions in the “specific power” rating of wind turbines installed in the United States

A wind turbine’s “specific power” rating relates its capacity to the swept area of its rotor in terms of Watt per square meter. For a given generator capacity, specific power declines as rotor size increases. In land-rich but capacity-constrained wind power markets, such as the United States, developers have an economic incentive to maximize megawatt-hours per constrained megawatt, and so have favored turbines with ever-lower specific power. To date, this trend toward lower specific power has pushed capacity factors higher while reducing the levelized cost of energy. We employ geospatial levelized cost of energy analysis across the United States to explore whether this trend is likely to continue. We find that under reasonable cost scenarios (i.e. presuming that logistical challenges from very large blades are surmountable), low-specific-power turbines could continue to be in demand going forward. Beyond levelized cost of energy, the boost in market value that low-specific-power turbines provide could become increasingly important as wind penetration grows

Effective capture of wind gusts in small wind turbines by using a full active rectifier

Small wind turbines have difficulties to start rotating at low wind speeds due to their relatively large rotor inertia and small starting torque. In case a permanent magnet generator is used, the rotor magnets will cause an additional cogging torque which makes starting even more difficult. By using the generator as motor from the moment a wind gust is detected, the turbine is able to accelerate much faster to reach the maximum power point. A maximum power point tracking algorithm is used to locate the optimal working point. At sufficiently large rotor speeds, the controller switches to the generator mode where the energy used for acceleration is recuperated, together with the additional energy captured from the wind gust. To control the generator power in both directions, an active rectifier is used in a back-to-back converter topology. In this paper, this wind capture strategy is simulated. The results show that the power output during a wind gust can be largely increased compared to common MPP-tracking

Design of a Small Scale Wind Generator for Low Wind Speed Areas

Most small scale level wind turbine generators are directly driven system, variable speed, and partially connected power electronic converter system. Choice of such system is to avoid costs associated with gearbox. However, due to low wind speed in most of the tropical countries, synchronous generators with smaller or medium speed Permanent Magnet (PM) generator design found to be important and given high performance efficiency. In order to be able to harvest wind energy in off-grid population efficiently, there was a need to design a synchronous generator that can be able to operate under low wind speed, directly connected to the end user. Hence, the study designed a six pole pair wind turbine generator using permanent magnet (PM) model, using Maxwell two dimensions (2D) and Rotational Machine Expert (RMxrpt) software. The designed PM AC wind turbine generator worked with efficiency of 93% at rotational speed (rpm) range from 50 to 350 with maximum power output of 980 watts.Keywords: Pole Pairs, Performance Characteristics, Permanent Magnet Wind Generato

Power Quality in Wind Power Systems

Wind power generation systems influence power quality in a specific way making important the need for detailed and accurate evaluation of disturbances caused by wind generators. Wind power system can cause sub- and interharmonic components to appear in the spectrum of voltages and currents. The paper shows different aspects of spectrum estimation in power systems, including the doubly fed induction generator (DFIG) connected to low voltage distribution grid. Harmonic distortions caused by wind generator under various operational conditions regarding wind speed, active and reactive power are shown and discussed. Advanced spectral methods (like ESPRIT) are applied to overcome the drawbacks of Fourier based techniques

Small Wind Power Machine for Rural and Farm Use in the State of Missouri

This paper describes work in progress to develop a prototype wind power generator for use by small farms, rural and isolated homes. It is anticipated that the wind power generator may supply power (1 to 10 kw) as base electric power (including energy storage), supplemental power, or in other forms (e.g. water pumping, nitrogen or hydrogen manufacture, and direct mechanical drive). The objective of this study is to produce a system(s) of high efficiency, low construction cost, and minimum maintenance requirement. Preliminary wind tunnel tests have been completed on several blade designs. A tower system is under construction on campus that will provide size prototype wind power generators