Abstract
As the requirements of economical operation and reliability on power grid are enhanced gradually nowadays, the existing under frequency load shedding (UFLS) scheme is not quite fit for the modern power system that integrates high wind power. In this paper, the impacts of high wind power penetration on the UFLS are discussed thoroughly. A novel adaptive load shedding (LS) scheme is presented taking the high wind power penetration into account. In the proposed scheme, the equivalent inertia constant (EIC) is calculated accurately to improve the power deficit accuracy so as to reduce the error of LS. The dynamic correction of power deficit is able to solve the negative effects of the wind power output random reduction/the wind generator tripping. Besides, the locking criterion is capable of avoiding the influences of the wind power output random increase on the LS, thus cutting down the LS costs and even preventing the frequency overshoot. Moreover, in terms of the LS parameters setting, the coordination of the low frequency protection of the wind generator and the frequency threshold is addressed. The location and capacity model of LS, which is based on the load characteristics, can ameliorate the frequency recovery process. Finally, the validity and robustness of the proposed scheme are verified in the simulations on the IEEE-39 bus system with high wind power penetration.
Highlights
The penetration of wind power is growing rapidly in the modern power system in recent years around the world [1]
For the system with high wind power penetration, there is a high probability of the random decrease of wind power output and the wind generator tripping under the serious fault
The IEEE-39 bus system integrated with high wind power penetration is applied for simulation and its simulation and its structure is shown as Figure 4
Summary
The penetration of wind power is growing rapidly in the modern power system in recent years around the world [1]. Large-scale wind power penetration will greatly change the system frequency dynamics and increase significant issues in operation and control of the power system, such as the UFLS [4]. Those negative effects on the UFLS scheme have rarely been considered or researched in the available literature. The frequency dynamic response of a realistic power system with reasonable integration of wind power was studied in [21] Few of these schemes above analyze the improvement direction of UFLS from the perspective of high wind power penetration.
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