Adaptive Under-Frequency Load Shedding Scheme in System Integrated with High Wind Power Penetration: Impacts and Improvements

Shun Li, Fei Tang, Youguo Shao and Qingfen Liao
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Shun Li: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Fei Tang: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Youguo Shao: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Qingfen Liao: School of Electrical Engineering, Wuhan University, Wuhan 430072, China

Energies, 2017, vol. 10, issue 9, 1-16

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.

Keywords: equivalent inertia constant (EIC); high wind power penetration; load shedding locking criterion; power deficit dynamic correction; under frequency load shedding (UFLS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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