Abstract
In general, the integral sliding mode control (ISMC) with an integral sliding surface would lead to tracking errors under unbalanced and harmonic grid voltage conditions. In order to eliminate tracking errors under these conditions, multi-resonant items are added to the conventional integral sliding surface in the proposed strategy, which can be called multi-resonant-based sliding mode control (MRSMC). A comparison of tracking precision on the ISMC and MRSMC is analyzed. In order to regulate the system powers directly, the errors of instantaneous active and reactive powers are selected as the state variables. Finally, the output current harmonics and a majority of the doubly-fed induction generator’s (DFIG) electromagnetic torque pulsations can be removed under unbalanced and harmonic grid voltage conditions. Simulation and experimental results are presented to verify the correctness and effectiveness of the proposed strategy.
Highlights
The growing capacity of the wind power generation system has led to increasing concerns about the output power quality, and operating reliability to satisfy the demand of accessing the network [1,2]
The most widely used wind power generation system is the doubly fed induction generator (DFIG) based wind power system, in which stator windings are directly connected to the grid
Many reports have indicated that unbalanced and harmonic grid voltages will introduce the harmonic components in the stator, rotor and grid side converter current, which leads to the distortion of the system’s total currents and pulsations of the DFIG’s electromagnetic torque [5,6]
Summary
The growing capacity of the wind power generation system has led to increasing concerns about the output power quality, and operating reliability to satisfy the demand of accessing the network [1,2]. In order to remove the pulsations of the DFIG’s torque and stator active/reactive power with unbalanced grid voltage, reference [21] proposed the integral sliding mode direct torque control (ISMC-DTC). Reference [23] proposed the ISMC-based DPC under both unbalanced and harmonically distorted grid voltage conditions, in which the pulsations of active power and reactive power were suppressed. In order to eliminate the tracking errors under unbalanced and harmonic distorted grid voltage conditions, this paper presents a MRSMC strategy for a DFIG-based wind power system. In this strategy, multi-resonant items are added to the conventional integral sliding surface to provide sufficient tracking precision on ac references.
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