Abstract
With the increasing installed capacity of the wind power, the power system has an obviously low inertia characteristic. It is of great significance to actively promote the virtual inertia frequency regulation technology of wind turbines (WTS) for improving the system frequency quality. The frequency regulation capability and frequency regulation effects of wind & thermal power units were analysed, and a variable inertia coordination frequency regulation strategy for different wind power penetration conditions was proposed in this paper. At the wind farm level, the dynamic frequency regulation participation coefficient of wind farms was fuzzily determined according to the operation conditions of WTS and the wind power penetration ratio. At the wind turbine level, the calculation method of the equivalent inertia constant of WTS was given based on the effective rotational kinetic energy. And the allowable range of frequency regulation parameters of WTS was determined by considering the incremental model of the system. Results indicated that the proposed coordinated frequency regulation strategy not only provided a reliable inertia support, but also maintained the stability of WTS. The frequency response performance of the high-penetration wind power system was improved.
Highlights
Wind power, as a relatively mature sustainable energy generation mode, has an increasing penetration proportion in the power system [1]
The frequency regulation ability of wind turbines (WTS) is stipulated in the latest grid guidelines issued at home and abroad to improve the frequency regulation capability of the highly penetrated wind power system [4]
At the wind turbine level, the active output of WTS or energy storage systems is changed to respond to the frequency fluctuation [5]
Summary
As a relatively mature sustainable energy generation mode, has an increasing penetration proportion in the power system [1]. A variable parameter frequency regulation control method was proposed in reference [17] according to the operation status of WTS. This method could avoid the secondary frequency drop and ensured the safe and stable operation of the system. The reference [20] further coordinated and optimized the short-term output of the wind and storage joint system by using the fuzzy control method and improved the frequency stability. To sum up, based on the analysis of the frequency regulation effect of wind farms and thermal power units, the variable inertia coordination frequency regulation strategy for different wind power penetration conditions is explored. The results show that the proposed strategy effectively improves the frequency quality and the stability of the system
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