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The paper deals with a Second Order Variable Structure Control (VSC) for Wind Turbine PMSG-based and Generator-side Converter System. By means of the proposed control and the associated sliding observer, a vectorial control of PMSG generator is recognized while maximum power point tracking by the renewable source and DC voltage control of the generator-side converter are assured to maintain a high...
To achieve automatic generation control (AGC), the constant active power control is required for wind turbine generators (WTG). The accurate estimation of available wind power (AWP) is a prerequisite for WTGs to effectively participate in AGC and enhance the performance of AGC. In such a case, the maximum power point tracking (MPPT) control is not adopted and accordingly the MPPT principle cannot...
An adaptive HOSMC (higher order sliding mode control) scheme is proposed to achieve maximum power point tracking of DFIG wind turbine system. DFIG power generation system is firstly established. Adaptive second order SM (sliding mode) rotor voltage controller is then presented to track maximum wind energy and adjust reactive power. Finally, the system simulation is executed under random wind speed...
With the vigorous development of new energy sources, wind power generation technology has been developed rapidly. Due to the reverse distribution of wind energy resources and load centers, large-scale wind power transmission is inevitable. Using series capacitor compensation technology is an effective measure to complete large-scale wind power transmission, but may induce sub-synchronous oscillation...
Wind energy has many advantages, because it does not pollute and is an inexhaustible source of energy. The Double Fed Induction Generator (DFIG) is one of the most important generator used for Horizontal Axis Wind Turbine (HAWT). The DFIG stator is linked directly to the grid, whilst the DFIG rotor is coupled via an electronic converter. In this paper, a discrete-time Neural Sliding Mode (N-SM) Field...
In almost all European countries, the penetration of wind power systems and the wind turbines size continuously increases. Therefore, the grid code requirements are more and more restrictive concerning the necessity that the wind turbine to remain connected to the grid during a fault situation. This paper analyzes the possibilities to have more accurate wind generation transient stability models for...
In this paper a flux weakening method for a wind power permanent magnet generator is proposed. In a wind energy conversion system, the rotor speed increases with the wind speed, hence a flux weakening (FW) algorithm should be implemented as a part of the control structure in order to prevent generator voltage from exceeding the maximum permissive value. On the other hand, it is essential to provide...
In order to analyze interaction between wind farm and electric power system, research transient voltage characteristics of large-scale wind farm in system fault and after fault, and realize large-scale wind farm fault ride through, it is necessary to build wind turbine modeling suitable for large electric power system simulating calculation program. Various power system simulators are used in many...
This paper proposes a coordinated control of wind turbine and energy storage system (ESS). Because wind power (WP) is highly dependent on variable wind speed and could induce a severe stability problem to power system especially when the WP has high penetration level. To solve this problem, many power generation corporations or grid operators recently use the ESS. It has very quick response and good...
This paper deals with the problem of the yaw angle misalignment in a wind turbine of horizontal axis type and proposes a novel technique for indirectly estimating it. Thus, accurate yaw control can be attained because it is not affected by the inaccuracies that are caused by the vortex flow downstream of the blades which highly influences the wind direction measurement obtained by sensors located...
Wind power generation system based on four-port electromechanical converter (FPEC) is a new wind power system, which overcomes the shortcomings of many traditional wind power generation systems. According to its working mode and operating characteristics, this paper proposes an improved system control strategy as well as the concrete realization method based on fuzzy logic, which improves the energy...
This paper presents a novel approach of coordinating the droop controls between grid-connected variable speed wind turbine (VSWT) and associated energy storage system (ESS) for supporting the primary frequency control in power systems. Available power reserve from the deloaded VSWT, which is a function of average wind speed and turbine rotational speed, is estimated in an efficient manner. Based on...
This paper presents the comparison of power captured by vertical and horizontal axis wind turbine (VAWT and HAWT). According to Betz, the limit of maximum coefficient power (CP) is 0.59. In this case CP is important parameter that determines the power extracted by a wind turbine we made. This paper investigates the impact of wind speed variation of wind turbine to extract the power. For VAWT we used...
More accurate dynamic models of wind turbines are of great importance in validating simulation results of their interaction with the network (micro-grid), and thus the reliability of the network (micro-grid) is improved. The first of this paper is an overview of wind power and wind energy conversion system structures. In addition, network requirements in the presence of wind energy conversion systems...
In this paper, a hybrid topology of series-connected passive-active rectifiers is proposed for offshore wind energy conversion systems (WECSs). In particular a combined structure of a voltage-source converter (VSC) and a diode rectifier (DR) is connected to a double-star permanent magnet synchronous generator (2S-PMSG) reducing cost and losses. Nonetheless, the current harmonics due to diodes behavior...
In recent years, wind power has been developing rapidly. As the wind power penetration from large scale wind turbines has been increasing rapidly in the transmission system, there is a higher requirement for the frequency stability and power generation efficiency of the wind power generation system, and the power grid puts forward higher continuous operation requirements for the grid connected wind...
In this paper, wind generator modeling is presented including the algorithm for maximizing the extracted power. The DFIG stator winding is directly connected to the utility grid and the rotor winding is connected via a back to back converter. The oriented flux control allows the machine to follow the set points of active and reactive power.
This paper presents the development of the dynamic modeling and transient stability analysis of Doubly Fed Induction Generator (DFIG) based wind energy conversion system (WECS). In this, the space phasor theory with alternate reference frame is used for machine modeling. The dq modelling of the DFIG machine has been developed. The per phase equivalent circuit of the DFIG in dq reference frame is obtained...
Power sector are moving towards to renewable energy sources for meeting the ever increasing power requirement. Therefore, wind power installed capacity has reached a substantial level which make essential to provide frequency support to the grid by using wind turbines. The inertial control and droop control techniques are utilized for participation of wind turbines in grid frequency regulation. Present...
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