Abstract
In this paper, a droop washout filter controller (DWC), composed of a conventional droop controller and a washout filter controller, is proposed. The droop controller is used to ensure the “plug-and-play” capability, and the droop gain is set small. The washout filter is introduced to compensate the active power dynamic performance (APDP). Compared to the droop controller, the DWC can achieve accurate active power sharing and smaller frequency difference without losing the APDP. Additionally, a novel modeling technology is proposed, using which a small-signal model for an island microgrid (MG) is constructed as a singular system. The system’s stability is analyzed and the DWC is verified using real-time (RT-LAB) simulation with hardware in the loop (HIL).
Highlights
Due to the environmental pollution of fossil energy, distributed generators (DGs), such as photovoltaic panels, have attracted great attention and their use is increasing rapidly
To improve the active power dynamic performance (APDP) of a DG embedded with the droop strategy, various control strategies have been put forward [5,6,7,8,9]
Compared with the controller that only contains droop controller, the droop coefficient could be set smaller, which results in a smaller frequency difference in the steady state, and the APDP can be compensated by the washout filter control loop
Summary
Due to the environmental pollution of fossil energy, distributed generators (DGs), such as photovoltaic panels, have attracted great attention and their use is increasing rapidly. To improve the active power dynamic performance (APDP) of a DG embedded with the droop strategy, various control strategies have been put forward [5,6,7,8,9]. In [9], the angle and frequency droop control strategies are combined to improve the performance of active power output. A washout, i.e., the lack of low-frequency component of output power, filter control strategy is proposed in [10]. Compared with the controller that only contains droop controller, the droop coefficient could be set smaller, which results in a smaller frequency difference in the steady state, and the APDP can be compensated by the washout filter control loop.
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