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This paper presents an alternate iterative method to perform AC/DC optimal power flow (AC/DC OPF) calculation considering wind farm integration. Firstly, an original AC/DC OPF model considering wind farm integration is constructed. Then, according to the decoupling theory in the alternate iterative method, the decoupling optimization model of AC/DC OPF model is derived, where the high voltage direct...
The control system is a key technology to extract maximum energy from the incident wind. By regulating aerodynamic control, it is possible to adapt the changes in wind speed by controlling shaft speed. Thus, the turbine generator can track maximum power extracted from wind. In this paper, we propose a Lyapunov based switching control under quasi-linear ARX neural network (QARXNN) model to track maximum...
With increasing integrations of large-scale systems based on permanent magnet synchronous generator wind turbine generators (PMSG-WTGs), the overall inertial response of a power system will tend to deteriorate as a result of the decoupling of rotor speed and grid frequency through the power converter as well as the scheduled retirement of conventional synchronous generators. Thus, PMSG-WTGs can provide...
In this paper we propose a method for dispatching a fleet of wind doubly-fed induction generators (DFIGs) in a fair fashion according to a prespecified total power reference. In our context fair means that wind generators (WGs) are required to reach the same utilization levels after dispatched. We pose the problem as a constrained consensus problem on the utilization levels among the rotor-side converters...
Fault Ride-Through (FRT) is a common requirement to abide by grid code all over the world. In this work, to enhance the fault ride-through capability of fixed speed wind generator system, a modified configuration of Bridge-Type Fault Current Limiter (BFCL) is proposed. To check the effectiveness of the proposed BFCL, its performance is compared with that of the Series Dynamic Braking Resistor (SDBR)...
Uncertainty and variability are the inherent factors in modern power systems with increasing number of intermittent power resources such as wind and solar integration. This paper presents a novel probabilistic approach to evaluate the power grid with Fault Ride-Through consideration of the wind generation. Low Voltage Ride-Through regulation applied in China grid is investigated in this paper. Critical...
This paper proposes a multi-objective optimal control and switching strategy for floating offshore wind turbines when the wind speed can be approximately predicted. The system is modeled as a hybrid automaton with two modes corresponding to the turbine operation in low- and high-speed wind profiles. The main control objective in the low-speed wind mode is to maximize the total captured power in a...
Gain scheduling for the widely-used NREL 5-MW proportional-integral blade pitch controller can be implemented either by the original documented method (Integrate First): integrate the generator speed error before multiplying by the gain-scheduling correction factor, or the Multiply First method: multiply the generator speed error by the gain-scheduling correction factor, then integrate. The results...
Current advances in lidar-technology provide the possibility of including wind preview information in the control design. Lidar-assisted collective pitch control is a simple, but promising approach to reduce the rotor speed variation and structural loads for full load operation. This work extends this approach to the transition between partial and full load operations. A multivariable controller is...
This paper summarizes current research and applications of wind turbine individual pitch control, reviews the basic concepts and working principles of individual pitch control methods, analyses the individual pitch control strategies for reducing the load, and mitigating grid voltage fluctuations, finally, the possible development prospects of wind turbine individual pitch control are discussed.
At present, haze has been raging over main cities in China. As a clean, contaminant free and regenerative energy, wind power has received wide acknowledgement and rapid development. Wind power generation has been developing with a tendency for big capacity, variable rotation speed, direct driving and intelligent control. On the basis of control target for wind power generation system, this document...
The stochastic nature of wind speed, time-varying of system parameters, system lagging and nonlinearities can lead to instability of the power generated by wind turbines. In order to improve the dynamic performance in the operation region of constant power output, multivariable control strategy using a sliding mode control technique is proposed based on analysis of the pitch-controlled system research...
Wind power does not pollute and is recyclable. The speed of the blades of a wind turbine speeds considerably affect the measured output power of the turbine. The speed of the tip of the blade must be set to maximize power output. The speed of the blade also significantly affects energy losses and the power coefficients. The former should be minimized and the latter maximized. Various loads on a turbine...
This paper presents an energetic and economic analysis of grid-connected renewable sources with storage. The goal is to increase the self-production of a hybrid photovoltaic (PV) and wind system, avoiding a large usage of the grid to supply the loads of commercial users. Simulations are performed for one year, starting from hourly consumption data and solar irradiance and wind speed measurements updated...
This paper deals with the modeling and control of a Wind Energy Conversion System (WECS) based on a Permanent Magnet Synchronous Generator (PMSG). The WECS operate at variable speed and the control algorithm is based on Direct Power Control (DPC) with an AC/DC conversion system with a PI controller for the DC bus output. The laboratory test system is developed with an emulator of a wind turbine and...
This paper solves an optimization problem to minimize the emission due to carbon oxides, nitrogen oxides and sulfur oxides with cost as a constraint for a wind-solar-thermal power system. Wind and solar energy can reach significant penetration in modern power system and they will introduce additional uncertainties. Market price is mainly influenced by the generating fuel cost, as the wind and solar...
The paper presents a prototype of a microsystem for the integration and the optimal management of renewable energy sources in order to attain a reduction of the total energy consumption of a not residential building. The system composed by the building and the prototype is an energy sustainable microsystem and is located in Italy in the city of Valderice. The microsystem has been conceived in the...
The paper main issue is the evaluation of the influence of the air density value on the electricity production capability of a wind generator. Two different density air mathematical models, where the density has not a constant value, are here taken into account and compared in terms of reliability, accuracy and computational burden. Evaluations are carried out thanks to a horizontal axis wind generator...
In modern era, producing green electrical energy has been a striking issue which coerced many scientists to focus on renewable energy systems (RES). Permanent Magnet Synchronous Generator (PMSG) based wind turbine is one of the most substantiating kinds of RES. Stochastic nature of wind speed complicates grid integration of wind turbines due to many reasons such as, voltage flicker, injecting variant...
If grid integration concerns have come to the fore in recent years as an issue that may impede the widespread deployment of wind generators into power systems, available scheduling algorithms to allow their seamless penetration to grid has lagged its explosive growth. This paper proposes a model to optimally commit generating units while simultaneously determining the geographical allocation of the...
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