Abstract
Several control strategies of the finite control set model predictive controls (FCS-MPC) have been proposed for power converters, such as predictive current control (PCC), direct predictive power control (DPPC), and predictive voltage control (PVC). However, for microgrid (MG) applications, the control strategy of the FCS-MPC for a power converter might be changed according to the operation mode of the MG system, which results in a transient response in the system voltage or current during the mode transition. This study proposes a new control strategy of FCS-MPC for use in both islanded and grid-connected operation modes of an MG system. Considering the characteristic of a synchronous generator, a direct phase angle and voltage amplitude model predictive control (PAC) of a power converter is proposed in this study for MG applications. In the islanded mode, the system frequency is directly controlled through the phase angle of the output voltage. In the grid-connected mode, a proportional-integral (PI) regulator is used to compensate for the phase angle and voltage amplitude of the power converter for constant power control. The phase angle of the system voltage can be easily adjusted for the synchronization process of an MG system. A comparison study on the proposed PAC method and existing predictive methods is carried out to show the effectiveness of the proposed method. The feasibility of the proposed PAC strategy is evaluated in a simulation-based system by using the MATLAB/Simulink environment.
Highlights
In recent years, the penetration of distributed generations (DGs), such as renewable energy resources (RESs) and energy storage systems (ESSs), in a microgrid (MG) system has increased rapidly [1]
predictive voltage control (PVC), a large transient voltage and between the cost function current might occur in theof system. and PVC, a large transient voltage and current might occur in theTo system. these problems, this study proposes a new finite control set model predictive controls (FCS-MPC) that has a similar cost overcome
A simple MG system shown in Figure 8 is considered to evaluate the performance of the consists of a converter-based distributed generation and a local load
Summary
The penetration of distributed generations (DGs), such as renewable energy resources (RESs) and energy storage systems (ESSs), in a microgrid (MG) system has increased rapidly [1]. By designing a suitable cost function, the FCS-MPC allows for controlling the current, voltage, power, and other variables [33,34]. Predictive current control (PCC), which was proposed in [35,36], can be used for a grid-feeding converter in grid-connected mode. It can be used in islanded mode if the MG system has a grid-forming converter. Predictive voltage control (PVC) for power converters with an output inductor-capacitor (LC) filter, which has been proposed in [38,39], can be used for grid-forming converters in the islanded mode.
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