Research on Frequency Control of Islanded Microgrid with Multiple Distributed Power Sources

Abstract

At present, some achievements have been made in the research on the energy management of microgrid operation. However, the research is mainly on the operation of grid-connected microgrid, while the research on the energy management of islanded microgrid is still relatively few. Frequency is one of the characteristics that affects the reliability and power quality of the microgrid. The essence of controlling frequency stability is to maintain source-load balance and redistribution of active power. Therefore, this paper proposes a frequency control strategy based on dynamically cutting machine to reduce load by analyzing the use priority of different distributed power supply and the division of load importance degree, and combining the influence degree of different frequency variation range on microgrid. To coordinate and control distributed power supply, energy storage device, and load in different frequency change areas, this paper proposes different control strategies. The seed strategies of the control strategy are discussed one by one. Experimental results show that the frequency control strategy can significantly improve the frequency stability of the power supply system and reduce the operating cost of islanded microgrid.

State of Charge Control Integrated with Load Frequency Control for BESS in Islanded Microgrid

“…A variation in frequency value may occur as a result of the primary control in the microgrid control system. One of the primary controls that is often used is a droop control [9]. The droop control strategy is appropriate for systems that adopt multiple microsources that participate Energies 2020, 13, 4657 3 of 19 in the system frequency regulation.…”

“…The reduction in inertia increases frequency oscillations of the system, as discussed in [7][8][9][10][11][12][13][14]. A frequency control strategy based on dynamically high-power machines to reduce the load is proposed in [9]. Li et al discuss a control strategy of a virtual synchronous generator (VSG) by utilizing a self-adaptive damping control strategy [10].…”

Impact of Advanced Load-Frequency Control on Optimal Size of Battery Energy Storage in Islanded Microgrid System

“…Nevertheless, they may impose limitations such as reserve power that must be available and slow generator response. [6][7][8][9]. Other works regarding microgrid control have also been carried out [10,11].…”

Stand-Alone Hybrid Power Plant Based on SiC Solar PV and Wind Inverters with Smart Spinning Reserve Management

“…In [34], the frequency stability of the system was supported by the diesel generators, whereas a shedding control strategy for some loads was applied to obtain a more economical dispatching. In [35], a combination of BESS and an electrolyzer-fuel cell system allowed to design some complex power management strategies, minimizing the operational cost of the stand-alone power plant.…”