Abstract
This paper focuses on a second order sliding mode based direct power controller (SOSM-DPC) of a three-phase grid-connected voltage source converter (VSC). The proposed control scheme combined with fuzzy logic aims at regulating the DC-link voltage of the converter and precisely tracking arbitrary power references, in order to easily control the system’s power factor. Therefore measures are proposed to reduce the chattering effects inherent to sliding-mode control (SMC). Simulations performed under Matlab/Simulink validate the feasibility of the designed Fuzzy-SOSM. Simulation results on a 1kVA grid-connected VSC under normal and faulted grid voltage conditions demonstrate good performance of the proposed control law in terms of robustness, stability and precision.
Highlights
Voltage source converter (VSC) is a very useful device
The VSC is a key element in power electronics-based equipment for flexible AC transmission systems (FACTS), high-voltage direct current (HVDC) systems and active power filters (APFs)
The power generated by the wind system is transmitted to the grid via the stator of the doubly fed induction generator (DFIG) (Fig.1)
Summary
Voltage source converter (VSC) is a very useful device. Among many desirable characteristics [1], the VSC permit the independent control of active and reactive power, what makes it very attractive for power conditioning and transmission. With the development of smart grids involving distributed generation and the interconnection of renewable power generation systems [2], such as wind farms, photovoltaic, solar thermal plants, etc., the need for power flow steering increases In this context, efficient control strategies for grid connected VSCs are relevant more than ever. Sliding-mode control (SMC) is a variable structure control strategy that uses a special version of on-off control, or high frequency switching, to achieve robust control of non-linear systems [4,5]. This paper aims at combining the advantages of FLC and SMC for robust control electronic power converter. This approach has been successful applied in wide area.
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