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This paper proposes a new control strategy using less number of sensors for variable speed wind energy conversion system (WECS). Maximum Power Point Tracking (MPPT) algorithm, and near unity power factor correction control (UPF) are achieved at the generator side using direct driven Permanent Magnet Synchronous Generator (PMSG). The PMSG operates at variable wind speed connected to a full controlled...
There are many loads such as remote villages, islands, etc. that are located far away from the main grid. These loads require stand-alone generating system, which can provide constant voltage and frequency for local electrification. Locally available wind power can be used in such off-grid systems. As the wind speed is variable, an AC-DC-AC conversion system is required to convert variable voltage...
This paper presents an optimized One-Power-Point method for maximum power tracking in a variable speed wind energy conversion system that uses a boost converter. For low-cost implementations, One-Power-Point maximum power tracking is preferable due to its ease of implementation and fast tracking ability. Its drawback is that power coefficient Cp deteriorates during wind speed drops. This means the...
Wind power is one of the common distributed generation in microgrid. According to the requirements of microgrid, permanent magnet synchronous wind generator (PMSWG) for wind energy distributed generation was designed in this paper and it has simple structure, easy control and low cost characteristics, non-controllable rectifier and grid-connected PWM convertor is adopted as the AC grid-connected circuit...
This paper is on wind energy conversion systems with full-power converter and permanent magnet synchronous generator. Different topologies for the power-electronic converters are considered, namely matrix and multilevel converters. Also, a new fractional-order control strategy is proposed for the variable-speed operation of the wind turbines. Simulation studies are carried out in order to adequately...
A high performance rectifier with a novel structural and wide speed range for direct-drive wind energy system has been investigated and design. The utilization rate and efficiency of low wind are critical focus for wind energy system, in the form of ultimate output dc voltage as the optimum object, a traditional full-bridge PWM rectifier and a boost circuit for the direct-drive permanent magnet synchronous...
This paper addresses the problem of frequency stability in an autonomous wind-diesel power system with energy storage. At high wind penetration levels and due to the lack of controlled rotating machines, wind fluctuation might cause unacceptable frequency excursions in the system and they need to be mitigated. A virtual synchronous machine control is designed to emulate a virtual inertia via power...
The modeling of wind power plants incorporating synchronous generator and full-converters for using in power system simulations is presented in this paper. In other words, all components of the above-mentioned power plant using typical values as well as their corresponding control systems are in details modeled and also simulated. The control strategy of the variable-speed wind turbine is the maximum...
The objective of this paper is to determine a suitable rotor structure for high-power performance for a large-scale direct-drive wind power permanent magnet synchronous generator (PMSG). The rotor structure generally uses a surface-mounted permanent magnet (SPM). Salient pole machines which use both magnet and reluctance torque are examined to obtain high-power performance in the PMSG. Four types...
This paper presents a novel control strategy for variable speed permanent magnet synchronous generator (PMSG) based wind-battery hybrid system in an isolated network. The proposed strategy comprises of chopper based speed control of generator for maximum power point tracking (MPPT) under varying wind conditions. A buck-boost converter is used to maintain constant DC-Link voltage and to interface an...
The purpose of this paper is to describe the design of a direct-drive, permanent magnet synchronous generator to be used in the addition of electrical generation capability to water-pumping windmills. A characterization of the existing turbine structure is given in order to determine the generator's nominal mechanical input parameters. Electric machine topologies currently used in wind energy conversion...
A maximum power point tracking (MPPT) controller for variable speed wind energy conversion system (WECS) is proposed. The proposed method, without requiring the knowledge of wind speed, air density or turbine parameters, generates at its output the optimum speed command for speed control loop of rotor flux oriented vector controlled machine side converter control system using only the instantaneous...
During recent years, the size of individual wind turbines has grown closer to 10 MW, and the size of wind power plants has increased significantly to 300 MW or more. This growing size of wind power generation requires that careful evaluation of transient stability of the overall grid should be undertaken. This paper attempts to investigate the impact of wind power plant penetration on the transient...
In the high power direct drive wind energy conversion systems, the power factors of both the generator-side converter and the grid-side converter are controlled to one in order to make full use of the capability of the power converters. In this paper, a novel sensorless unity power factor control method based on the reference coordinate system rotating synchronously with the voltage of the generator-side...
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