Current control of grid-connected inverter using integral sliding mode control and resonant compensation

<p>To eliminate the adverse effect from parameter variations as well as distorted grid conditions, a current control scheme of an LCL-filtered grid-connected inverter using a discrete integral sliding mode control (ISMC) and resonant compensation is presented. The proposed scheme is constructed based on the cascaded multiloop structure, in which three control loops are composed of grid-side current control, capacitor voltage control, and inverter-side current control. An active damping to suppress the resonance caused by LCL filter can be effectively realized by means of the inverter-side feedback control loop. Furthermore, the seamless transfer operation between the grid-connected mode and islanded mode is achieved by the capacitor voltage control loop. To retain a high tracking performance and robustness of the ISMC as well as an excellent harmonic compensation capability of the resonant control (RC) scheme at the same time, two control methods are combined in the proposed current controller. As a result, the proposed scheme yields a high quality of the injected grid currents and fast dynamic response even under distorted grid conditions. Furthermore, to reduce the number of sensors, a discrete-time reduced-order state observer is introduced. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed scheme.</p>

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Integral Sliding Mode Control Based Deadbeat Predictive Current Control for PMSM Drives with Disturbance Rejection

IEEE Transactions on Power Electronics ◽

10.1109/tpel.2021.3115875 ◽

2021 ◽

pp. 1-1

Author(s):

Yongxiang Xu ◽

Shaobin Li ◽

Jibin Zou

Keyword(s):

Sliding Mode Control ◽

Disturbance Rejection ◽

Sliding Mode ◽

Current Control ◽

Integral Sliding Mode Control ◽

Integral Sliding Mode ◽

Mode Control

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Discrete–Time Integral Sliding Mode Control with Disturbances Compensation and Reduced Chattering for Pv Grid–Connected Inverter

Journal of Electrical Engineering ◽

10.1515/jee-2015-0010 ◽

2015 ◽

Vol 66 (2) ◽

pp. 61-69 ◽

Cited By ~ 6

Author(s):

Santolo Meo ◽

Vincenzo Sorrentino

Keyword(s):

Sliding Mode Control ◽

Discrete Time ◽

Control Algorithm ◽

Sliding Mode ◽

Integral Sliding Mode Control ◽

Integral Sliding Mode ◽

Mode Control ◽

Time Integral ◽

Grid Connected Inverter ◽

Disturbances Compensation

Abstract In the paper a new discrete-time integral sliding mode control (DISMC) with disturbances compensation and reduced chattering for grid-connected inverter is proposed for active and reactive power regulation. Differently by many SMC proposed in literature that have a time-continuous formulation in spite have been implemented with digital processor, the proposed DISMC is fully formulated in discrete-time, taking into account the effects introduced by a microprocessor-based implementation. As will be demonstrated such approach consents to reduce the chattering about the sliding manifold within a boundary layer of O(T2) thickness instead of O(T) (being T the sampling period of the control algorithm). Moreover it introduces a correction of the control vector which eliminates the influence of modeling error and external disturbances improving stability and robustness of the controlled system. Constant converter switching frequency is achieved by using space vector modulation, which eases the design of the ac harmonic filter. In the paper, after a detailed formalization of the proposed control algorithm, several numerical and experimental results on a three-phase grid-connected inverter prototype are shown, proving the effectiveness of the control strategy.

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