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To reduce the impact of large output power fluctuations of a wind turbine generator (WTG) integrated in a power system, a battery energy storage system (BESS) is installed with the WTG. However, if a large battery is installed, the capital cost of the wind turbine system will increase. Hence, the smaller size of battery is preferable to reduce the capital cost and the battery should be utilized effectively...
This paper deals with an isolated wind-hydro hybrid generation system employing a Squirrel Cage Induction Generator (SCIG) driven by hydro turbine and a Permanent Magnet Synchronous Generator (PMSG) driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors...
Two control schemes for active and reactive power of a double-fed induction generator with the stator connected direct to the constant frequency, three phase grid are described. First the direct and quadrature rotor current components are generated based on the mathematical model of the machine. The second scheme used a PI controller to generate the rotor current reference components. The principles...
Increased awareness of environmental concerns has caused greater interest in developing power sources based on renewable technologies, such as wind. Due to the intermittent nature of the wind speed, output voltage and frequency of the direct driven permanent magnet synchronous generators (PMSG) are normally unsteady. Recently proposed Z-source inverter has been considered as a potential solution for...
The objective of this paper is to propose a simple emulator of variable speed wind turbine generator, which consists of two inverters control two squirrel cage induction motors. One acts as prime mover and other acts as variable speed generator. As prime mover, the manual speed command is used to simulate as close as possible of wind turbine. As generator, the variable speed self excited induction...
Because of the renewable energy generation (for example wind and photovoltaic) becomes a new research hotspot, people pays more attention to the problem of power fluctuation of wind/PV (photovoltaic) generation as the wind velocity and solar insolation intensity are intermittent and unpredictable. To solve the problem, this paper introduced superconducting magnetic energy storage (SMES). Compared...
The paper proposes an adaptive sliding observer to accurately estimate the rotor position for a direct-drive permanent magnet synchronous generator (PMSG). Without any position sensor, the generator torque and flux responses retain high performance both in the steady state and during transients. The problem on the shaft encoder installation difficulty, reliability and disturbance in encoder cable...
In this paper the use of the permanent magnet induction generator (PMIG) as a direct drive, direct online solution for wind energy conversion is considered. A wind farm system with several PMIGs connected to a single voltage source converter (VSC) is proposed. This VSC forms part of a utility grid-connected HVDC transmission system. A PMIG model and control strategies for the VSCs are derived. A 3...
Wind power generation as one of the most popular renewable energy applications is absorbing more and more attention all over the world. However, output power fluctuations of wind farm due to random variations of wind speed can cause network frequency and voltage flicker in power systems. The power quality consequently declines, particularly in an isolated power system such as the power system in a...
The usual dual-stator winding induction generator (DWIG) is composed of three-phase power windings and three-phase control windings, named as 3/3-phase DWIG. The power winding has only three phases, and also connects to a rectifier load, which results in larger harmonic magnetomotive force (MMF) in the generator. In order to overcome these problems, the power winding of 3/3-phase DWIG is converted...
In this paper a modified-forward multi-input converter (MFMIC) for renewable energy is proposed, which can not only process solar energy but deal with wind power. The proposed converter is derived from series forward structure to step down voltage for charger systems or dc distribution applications. The MFMIC mainly contains an upper forward, a lower forward, a common output inductor, and a DSP-based...
Wind energy conversion systems have become important in the research of renewable energy sources. This is not a small part due to the rapid advances in the size of wind generators as well as the development of power electronics and their applicability in wind energy extraction. However, wind energy has a drawback of having only 1/800 density as compared to that of water energy, and it does not remain...
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