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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...
With the increasing capacity of wind farms, the system stability problems caused by output loss of large-scale wind farms become the focus. In fact, the reality indicates that the reclosing failures take place frequently after the wind farms' outgoing circuit faults. Meanwhile, even reclosing the outgoing line successfully, the wind farm output may have a big difference before and after the circuit...
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...
Wind energy installed power worldwide reached 350.000 MW in 2015 with strong prospects to grow notably in the next 20 years. The cases of E.U. and of Denmark are illustrated. Electric generators and their power electronics control represent an important part of any wind energy conversion system, besides the turbine, tower and auxiliary electrical equipment. Large wind generator transmission stages...
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...
In recent years, environmental problems are becoming serious and renewable energy systems, especially wind power generation, have attracted much attention and been introduced into power systems. However, wind power generator output is intermittent, resulting frequency fluctuations in the connected power system. A doubly fed induction generator (DFIG) based diesel generation system is proposed in this...
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...
Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis...
After years of rapid development, wind energy has become one of the three major energy sources in China. Due to the rapid development of wind power industry, wind energy has become one of the most important energy sources in the world, the demand for wind turbines is also growing. Therefore, investigations of the wind turbines are particularly important. Dual-stator brushless doubly-fed generator...
The eddy current loss of permanent magnet will result in the increase of permanent magnet temperature and the change of the magnetic properties, the efficiency of the generator will be reduced and the performance will become poor. In this paper, the permanent magnet eddy current loss of the finite element model of two degree of freedom permanent magnet synchronous generator is calculated and analyzed...
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...
A hybrid predictive control strategy is proposed which can efficiently deal with the speed regulation control of permanent magnet synchronous generator (PMSG) in wind-energy conversion system. A single linear MPC controller is designed with a simpler linearization model. Model predictive controller generates control voltages which are iuput into PWM controller. Thus PMSG can be controlled by three-phase...
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