Abstract
When a large amount of wind power is connected to the power grid, certain control methods need to be taken for wind turbines (WTs) so that WTs can respond to system frequency changes and maintain system frequency stability. Based on the frequency control method of a single doubly fed induction generator, a deloading power coordinated distribution method for frequency regulation by wind farms considering wind speed differences is proposed to better utilize the wind farm frequency regulation ability. A reasonable distribution of the deloading power of a wind farm for participation in grid frequency regulation to better utilize the wind farm frequency regulation ability. A quantitative calculation formula for the wind speed, total deloading power and single WT deloading power is established by using a variable parameter deloading power coordinated distribution coefficient based on the wind speed. The deloading power is distributed according to the wind speed of the WT units to adapt to the wind speed distribution differences between WTs in cluster wind farms and fully utilize the wind farm frequency regulation ability. A typical doubly fed induction generator (DFIG) wind farm is used as a simulation case. The experimental results show that the control strategy can distribute the output of each WT, improve the frequency response of the wind farm and enhance the frequency stability of the system.
Highlights
According to the 14th Global Wind Power Development Report released by the Global Wind Energy Council (GWEC), the global installed capacity of wind power will be approximately 51.3 GW in 2018, with a total installed capacity for electricity generation of 591.55 GW
On the basis of reference [18], a frequencyregulated power weighting coefficient proportional to the wind speed is added in [19], allowing high wind speed wind turbines (WTs) to release more rotor kinetic energy to participate in frequency regulation, which further improves the frequency stability of the system
The innovation of this paper is to propose a coordinated distribution method for frequency regulation by wind farms considering wind speed differences, which is mainly used to receive the deloading power of the wind farm from the dispatching center, and assign the deloading power to each WT according to the different wind speeds in the wind farm
Summary
According to the 14th Global Wind Power Development Report released by the Global Wind Energy Council (GWEC), the global installed capacity of wind power will be approximately 51.3 GW in 2018, with a total installed capacity for electricity generation of 591.55 GW. On the basis of reference [18], a frequencyregulated power weighting coefficient proportional to the wind speed is added in [19], allowing high wind speed WTs to release more rotor kinetic energy to participate in frequency regulation, which further improves the frequency stability of the system. This method is simple and easy, but it linearizes the complex nonlinear relationship between the wind speed and active output.
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