The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Extracting as much as wind energy as possible and feeding the grid with high quality power are the two main targets for the grid connected wind turbine system. This paper proposes the design of an efficient controller for the 3.2KW wind turbine which grabs the maximum power from the available wind. The 3.2 KW wind turbine system provides a variable frequency AC voltage and this variable frequency...
The control for a switched reluctance generator (SRG) with three-level power converter to increase output power is presented in this paper. First, the operation conditions and key factors to enhance output power of SRG are proposed. Then a three-level power converter with intermediate freewheeling boosts the magnetizing current and the average current in generation freewheeling region. Accordingly,...
A high efficiency wind power converter, mainly constructed by the proposed duty boundary condition boost converter (DBC-BC) is proposed in this paper. It can work in the high efficiency duty cycle to effectively increase the efficiency of wind power converter. A 3kW prototype is designed and implemented to assess the performance of the proposed DBC-BC. Experimental results show that a wind power converter...
The use of wind energy in urban contexts, for a number of small power applications, is of greater and greater interest. The urban environment is characterised by multidirectional winds with a wide speed range, therefore it is necessary that the generation system is capable of delivering power in a wide range of operating conditions. For this reason it is of great interest to determine which power...
This paper presents the application of DC-DC converter for supplying DC load from the standalone wind turbine. Output obtained from the induction generator is not constant due to variation in the wind speed. To maintain the constant voltage at the output step up converter and sliding mode based step down converter is used.
This paper presents the emulation of grid-connected wind energy conversion system based on the 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. This system is composed by a three-phase permanent magnet generator, an AC to DC converter and a single phase Voltage Source Inverter (VSI). The inverter was driven using Space Vector Pulse Width Modulation (SVPWM) at a switching frequency of 18 kHz and...
An analysis and improvement of the direct power control method (DPC) for converter feeding generators in wind power applications under disturbed grid voltages is presented. An improved DPC method is derived and described, and its performance is analyzed as well. This improved DPC permits a robust and dynamic control of active and reactive power even under symmetrical and unsymmetrical voltage sags,...
This paper presents an enhanced direct power control (DPC) algorithm for doubly fed induction generators (DFIG) capable of reducing the common mode voltage (CMV). Nowadays the DFIG is often used in high power wind energy conversion systems (WECS). A common problem of converter fed induction machines are the bearing damages due to the bearing currents. The source of this problem is the common mode...
This paper deals with a voltage and frequency controller (VFC) of a stand-alone wind energy conversion system using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Two-leg reduced switch integrated voltage source converter (VSC) with a battery...
Offshore wind farms are facing challenges which call for redesigning the electrical drive train of future wind turbines. The turbines are expected to increase in power, and plans for 10-15 MW wind turbines have been reported. Hence will a medium-to high voltage converter solution be highly beneficial. Additionally, a DC-distribution grid is discussed for offshore applications. This indicates that...
As interest in renewable energy systems with various sources continues to grow, there is a strong need for integrated power converters that are capable of interfacing and concurrently controlling several power terminals. Meanwhile, energy storage is required to compensate for the mismatch between the sourcing and loading power patterns over a regular operational cycle. Therefore, different operational...
In the past, overhead lines, cables, transformers and circuit breakers represented the core components of electric power systems. However, in light of a considerable and still increasing share of renewable energy sources in grids, a change in electricity infrastructure can be observed. Over the last decades advances in power semiconductor devices have paved the way for innovative equipment such as...
This paper implements of a three phase grid synchronization for doubly-fed induction generators (DFIG) in wind generation system. A stator flux oriented vector is used to control the variable speed DFIG for the utility grid synchronization, active power and reactive power. Before synchronization, the stator voltage is adjusted equal to the amplitude of the grid voltage by controlling the d-axis rotor...
Present day power networks have become very complex with integration of various kinds of loads and distributed generations such as wind power, mini hydro, dendro and solar. Hence, research activities in the area of control strategies on sophisticated operation of complex power systems are abundant. These studies require sound mathematical and theoretical analysis, advanced simulation packages and...
This paper presents a new neutral point balancing strategy for the five-level diode clamped converter (DCC) which can be used in STATCOM (static synchronous compensator) of wind energy conversion systems (WECS), with lower switching frequency below 1 kHz. The proposed space vector modulation (SVM) strategy reduces voltage variations at the converter neutral point, with no need for additional controls...
In parallel converters applications, direct parallel topology was respected because of the advantages of small size, low cost, simple structure and easy to extend. However, the coupling effects maybe exist because the parallel converters are connected by non-isolated mode. In this paper the average model was proposed in the rotating coordinate system. As the entire system is a symmetric structure,...
Conceptually, a micro-grids can operate in parallel with the main grid system to support the grid voltage or as an isolated system to support customers isolated from the grid. In islanding operations, the micro-grid can continue to supply power to the customers thereby increasing the reliability of the power system. In a micro-grid with a significant percentage of wind power, a reactive power source...
A DC-UPS is proposed in this paper, the converter is applicable to photovoltaic/wind systems. The power can be demanded to a photovoltaic/wind system and from the battery set simultaneously or to each one independently. The operation of the converter is presented in detail. Simulation and experimental results are presented.
For the further improvement of today's full converter systems for windpower applications a 6 MVA converter prototype has been developed. It is utilizing the ANPC5L topology as inverter on the grid-side and the simple 2-quadrant ANPC3L topology as rectifier for a permanent magnet synchronous generator (PMG). ANPC stands for Active Neutral Point Clamped, which is the base for the derivation of multiple...
This paper is concerned with modeling and simulation of a wind energy system with different topologies for the power converters, namely a matrix converter and a multilevel converter. We use pulse modulation by space vector modulation associated with sliding mode for controlling the converters, and we introduce power factor control at the output of the converters. Finally, we present the electric behavior...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.