Feb 9, 2021 · Battery energy storage has gradually become a research hotspot in power system frequency modulation due to its quick response and flexible regulation. This article first
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Dec 1, 2022 · According to the output and compensation weights of the fuzzy controller, the state of charge for energy storage system can be adjusted adaptively to help thermal power units
Dec 15, 2023 · Hong Xiaowu [3] studied a large capacity thermal power unit to participate in a frequency modulation control strategy, and the results show that the digital electrohydraulic
The dynamic frequency modulation model of the whole regional power grid is composed of thermal power units, energy storage systems, nonlinear frequency difference signal decomposition, fire-storage cooperative fuzzy control power distribution, energy storage system output control and other components. Fig. 1.
Li Cuiping et al. used a battery energy storage system to assist in the frequency modulation of thermal power units, significantly improving the frequency modulation effect, smoothing the unit output power and reducing unit wear.
Under the four control strategies of A, B, C and D, the hybrid energy storage participating in the primary frequency modulation of the unit |Δ fm | is 0.00194 p.u.Hz, excluding the energy storage system when the frequency modulation |Δ fm | is 0.00316 p.u.Hz, compared to a decrease of 37.61 %.
In this strategy, part of the power commands are assigned to the energy storage system through fuzzy control, so as to establish the primary frequency modulation scheduling module of the thermal power unit coupling energy storage system, which can ensure the power generation revenue of thermal power units.
In summary, control scheme D is adopted when hybrid energy storage combined thermal power units are configured to participate in frequency modulation, namely, both flywheel energy storage and lithium battery energy storage adopt an adaptive variable coefficient control strategy to achieve the best effect.
The frequency modulation of thermal power unit has disadvantages such as long response time and slow climbing speed. Battery energy storage has gradually become a research hotspot in power system frequency modulation due to its quick response and flexible regulation.
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