Abstract
This paper presents a new output power smoothing control strategy for a wind farm based on the allocation of wind turbines. The wind turbines in the wind farm are divided into control wind turbines (CWT) and power wind turbines (PWT), separately. The PWTs are expected to output as much power as possible and a maximum power point tracking (MPPT) control strategy combining the rotor inertia based power smoothing method is adopted. The CWTs are in charge of the output power smoothing for the whole wind farm by giving the calculated appropriate power. The battery energy storage system (BESS) with small capacity is installed to be the support and its charge and discharge times are greatly reduced comparing with the traditional ESSs based power smoothing strategies. The simulation model of the permanent magnet synchronous generators (PMSG) based wind farm by considering the wake effect is built in Matlab/Simulink to test the proposed power smoothing method. Three different working modes of the wind farm are given in the simulation and the simulation results verify the effectiveness of the proposed power smoothing control strategy.
Highlights
Wind energy is the most mature and promising renewable energy source in the world at present.The doubly-fed induction generator (DFIG) based and direct-drive permanent magnet synchronous generator (PMSG) based systems are the most popular wind energy conversion systems (WECS), which are widely used in wind farms [1]
The WTs of the wind farm are divided into two classes: control wind turbines (CWT) and power wind turbines (PWT)
This paper proposed a novel power smoothing control strategy for the wind farm by using the allocation of wind turbines
Summary
Wind energy is the most mature and promising renewable energy source in the world at present. The problems caused by the wind power fluctuations are listed as: frequency deviation, voltage flicker, low power quality, and harm to sensitive loads [3,4,5] To solve these problems, several methods are proposed to smooth the output power of the wind farm, which can be basically divided into two major categories: direct power control and indirect power control. The direct power control methods always focus on the output power smoothing of a single WT, which may lead to the poor effect for the entire wind farm. The flywheel ESS utilizes the kinetic energy of a rotating disc, which depends on the square of the rotational speed It has the advantages of long cycling life, large energy storage capacity, and high reliability [17,18]. The simulation model of the wind farm based on the proposed control strategies is built in Matlab/Simulink and the efficiency of the proposed strategy is verified by the simulation results
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