Abstract
It is important to reduce the impact of the high penetration of wind power into the electricity supply for the purposes of the security and stability of the power grid. As such, the inertia capability of wind farms has become an observation index. The existing control modes cannot guarantee the wind turbine to respond to the frequency variation of the grid, hence, it may lead to frequency instability as the penetration of wind power gets much higher. For the stability of the power grid, a simple and applicable method is to realize inertia response by controlling wind farms based on a high-speed communication network. Thus, with the consideration of the inertia released by a wind turbine at its different operating points, the inertia control mechanism of a doubly-fed wind turbine is analyzed firstly in this paper. The optimal exit point of inertia control is discussed. Then, an active power control strategy for wind farms is proposed to reserve the maximum inertia under a given power output constraint. Furthermore, turbines in a wind farm are grouped depending on their inertia capabilities, and a wind farm inertia control strategy for reasonable extraction of inertia is then presented. Finally, the effectiveness of the proposed control strategy is verified by simulation on the RT-LAB (11.3.3, OPAL-RT TECHNOLOGIES, Montreal, Quebec, Canada) platform with detailed models of the wind farm.
Highlights
With the advance of renewable energy technologies, wind power has developed rapidly in the world
Based on high speed communication system, a wind farm active power control strategy which can realize both wind farm active power reference tracking and wind farm inertia reverse maximization is operate in the state of maximum inertia reserve before faults occur in the power system, it will provide a better support in transient for the grid
According to thediscussion relationship kinetic energy released by the rotor and and the the inertia release and lacked onbetween the exitthe point of wind turbine inertia control
Summary
With the advance of renewable energy technologies, wind power has developed rapidly in the world. Many investigations have been done on active control strategies, such as active power instruction equalization control [8], instruction distribution with the optimum target of reducing the number of wind turbine starts and stops [9] and clustering control based on wind turbine power trend [10] These studies all take tracking grid dispatching instructions as an active control objective of the wind farm and do not consider the system frequency regulation and inertia response; [8,9,10,11,12] proposed an principle of active power control in the wind farm based on generation plan tracking and supplemented by system frequency regulation, but its discussion seems quite simple. A phased wind farm inertia control strategy is proposed to improve the stability and safety of wind farm inertia support in the case of sudden changes in grid frequency
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