The large-scale grid-forming wind turbine generators(WTGs)will change the frequency response characteristics of the power system,while the traditional low-frequency load shedding strategy has not taken into account the impact of grid-forming wind power,which may lead to unreasonable system load shedding after high power shortage.This paper proposes a low-frequency load shedding strategy for power systems that considers the frequency response of grid-forming wind power.Firstly,based on the virtual inertia of grid-forming wind power and the primary frequency control model,a simplified system frequency response model is established that takes into account the frequency response of grid-forming wind power.Secondly,the impact of the active power response characteristics of grid-forming wind power on the unbalanced power amount of the system is analyzed,and then the unbalanced power amount used to guide multiple rounds of load shedding in the power grid is finely estimated,thus proposing an adaptive low-frequency load shedding implementation strategy.Finally,the feasibility and effectiveness of the low-frequency load shedding strategy proposed in this paper were verified through numerical analysis.
关键词
构网型风电机组/虚拟惯量/一次调频/功率缺额/低频减载
Key words
grid-forming wind turbine generators/virtual inertia/primary frequency regulation/power deficiency/under-frequency load shedding
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