Abstract
The microgrid (MG) is an emerging technology for supplying energy from renewable energy sources (RES). Due to their intermittent nature, RES require an inverter and smooth operation control system when integrated into an MG. Conventional droop control is commonly used in microgrid control but cannot achieve adequate power-sharing when output impedances of inverters are different; thus, enhancing its performance is required. This paper’s main objective is to design a finite control set model predictive control (FSC-MPC) based arctan droop control and evaluate its performance against the conventional droop control strategy. The proposed control technique guarantees a strong transient response when there is a dynamic load change during MG operation. The results showed that the proposed control strategy ensures proportionate power-sharing of paralleled voltage source inverters with unequal line impedances than the traditional droop controller, which can vary.
Highlights
Distributed generation (DG) is increasing in many parts of the world
The MPC-based droop control strategy’s performance to regulate inverters for voltage and frequency stabilization in a microgrid is compared to the traditional droop control strategy
It has been found that the proportionate reactive powersharing using the proposed control strategy is achieved, and both DG units share the load approximatively at a percentage of 50% each. It is not the same case in traditional droop control, where DG1 delivered 66.33%, and DG2 supplied 33.64% of the total reactive power of the load. This better performance of the proposed method for power-sharing is explained by its capability to reduce the effect of line impedance mismatch among the DG units based inverters, tracking the reference voltage that boosts proportionate power-sharing among DGs in the microgrid
Summary
Distributed generation (DG) is increasing in many parts of the world. DG’s high penetration to the electric network gives rise to the microgrid (MG) concept. When its local generation provides the demand, it is called islanded or autonomous mode. Its main aim is to provide frequency, voltage control, and ensuring energy support in islanded mode. When there are no synchronous generators for balancing demand and supply for island service, the inverter must provide these controls, mainly frequency control. DGs boost service efficiency and eliminates the cost of generation growth planning It expands the probability of islanding microgrid sources in charge of local power generators’ quality factors, which is impossible for traditional controlled power production [3]. Droop controls assure power equitability for DG units in a microgrid network They showed some limitations like inadequacy in reactive power-sharing and poor voltage regulation
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