Abstract
In this paper, we present a new control technique for sustaining dynamic voltage stability by effective reactive power control and coordination of distributed energy resources (DERs) in microgrids. The proposed control technique is based on model-free control (MFC), which has shown successful operation and improved performance in different domains and applications. This paper presents its first use in the voltage stability of a microgrid setting employing multiple synchronous generator (SG)-based and power electronic (PE)-based DERs. MFC is a computationally efficient, data-driven control technique that does not require modelling of the different components and disturbances in the power system. It is utilized as an online controller to achieve the dynamic voltage stability of a microgrid system under different disturbances and fault conditions. A 21-bus microgrid system fed by multiple DERs is considered as a case study and the overall dynamic voltage stability is investigated using time-domain dynamic simulations. Numerical results show that the proposed MFC provides improvements on the dynamic load bus voltage profiles and requires less computational time as compared to the traditional enhanced microgrid voltage stabilizer (EMGVS) scheme. Due to its simplicity and low computational requirement, MFC can be easily implemented in resource-constrained computing devices such as smart inverters.
Highlights
The voltage stability of distribution systems has a prominent position in smart grid research.Improvements in the currently overstressed electric power grid’s generation, transmission, and distribution capabilities, and their overall resiliency, have become increasingly important, and voltage stability, in particular, is one of the main problems concerning electric power utilities
A new control method for sustaining dynamic voltage stability by effective reactive power. This illustrates the light computational requirement of the proposed model-free control (MFC) strategy, which makes it a control and coordination of distributed energy resources (DERs) in microgrids was introduced in this paper
Voltage stability control strategy is applied to the IEEE 21-bus microgrid environment utilizing SGbased and power electronic (PE)-based
Summary
The voltage stability of distribution systems has a prominent position in smart grid research. To address the aforementioned challenges (the need for accurate system models and the computational complexity), we propose a model-free control (MFC)-based strategy for achieving an effective reactive power control and coordination of all available DERs to sustain the voltage stability phenomenon of distribution systems and microgrids. MFC strategy is a computationally efficient, data-driven control technique [25] These two features provide significant benefits for power system control since the dynamics of that does not require modelling of the different components and disturbances in the power system. It is worth mentioning that preliminary results for a SG-based microgrid network using the proposed model-free dynamic voltage control were initially presented in [26]
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