Abstract
With the aim to solve the problem related to the power chattering and anti-disturbance performance of a photovoltaic (PV) inverter in master–slave-organized islanded microgrid, an anti-disturbance finite-time adaptive sliding mode backstepping (DFA-SMB) controller is designed in this paper. First, the topology and the second-order dynamic model of PV inverter are established based on constant DC voltage and constant reactive power control method. Subsequently, the backstepping method is adopted to perform the control of a high-order system. Moreover, a second-order sliding mode differentiator is used to realize the function of command-filter, solving the differential expansion problem caused by the derivation of virtual controller. Besides, the terminal sliding mode control (TSMC) is introduced into the q-axis controller and d-axis inner loop controller, increasing the robustness and reducing the convergence time of the system. Adaptive control and disturbance-observer (DO) are used to perform the adaptive estimation of model parameters and the observation of lumped disturbances, respectively, enhancing the dynamic characteristics of the controller. Finally, a master–slave-organized islanded microgrid with 100 kW PV array is established in MATLAB/Simulink. The results demonstrate that the proposed control method can effectively reduce power chattering and improve the anti-disturbance ability of the PV system.
Highlights
In recent years, distributed energy resources (DERs) have gained more and more attention because of their excellent economy and cleanliness
The islanded mode refers to the mode in which the microgrid is not connected with the external grid, and the electric energy produced by the PV system is transmitted to loads or a distribution network directly [5]
The fractional-order sliding mode control method was applied on an islanded DER system to realize the system output voltage tracking of the reference voltage [12]; a DC source was used instead of DER, and there was no energy storage unit
Summary
In recent years, distributed energy resources (DERs) have gained more and more attention because of their excellent economy and cleanliness. The fractional-order sliding mode control method was applied on an islanded DER system to realize the system output voltage tracking of the reference voltage [12]; a DC source was used instead of DER, and there was no energy storage unit. Reference [14] proposed a two-layer model predictive control in islanded PV microgrid, reducing the operational cost and increasing the robustness of the system. The effectiveness of this method in real-time control of the microgrid was verified by simulation. Controller is designed for PV inverter in master–slave-organized islanded microgrid, which enhances the anti-disturbance capability of PV system and reduces the power chattering.
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