Sliding mode control approach for voltage regulation in microgrids with DFIG based wind generations

This study proposes an improved direct power control (DPC) strategy based on sliding mode control (SMC) with dual closed loop for the Vienna-type rectifier to improve transient response during both start-up and load step-change periods and to guarantee stability in steady state. The inner power closed-loop utilises SMC-DPC controller to directly regulate the required rectifier's control voltage without transforming to synchronous rotating coordinate reference frame or tracking phase angle of the grid voltage, which simplifies the control system. In addition, the outer loop employs a novel sliding mode controller to improve the dynamic performance of the dc output voltage and the instantaneous power. Finally, the dynamic and steady-state performances of the grid current, dc output voltage, active/reactive power are experimentally investigated and compared with the conventional proportional-integral-DPC scheme, both the simulation and the experimental results demonstrated the dynamic performance and stability of the proposed control scheme.

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“…Substituting for P, Q, and their derivatives using (11) leads to the following equationṠ = F + DV ab (18) where F and D are calculated as follows…”

Section: Dpc Based On Smc For Inner Power Loopmentioning

confidence: 99%

“…Compared with the aforementioned control methods, direct power control (DPC) is an efficient control strategy for the voltage-soured rectifiers [17][18][19][20][21][22][23][24]. The classical lookup table (LUT) DPC has simple control structure without coordinate transformations, and it has excellent robustness and dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Improved direct power control for Vienna‐type rectifiers based on sliding mode control

Xie

Shi

2016

IET Power Electronics

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“…The switching surfaces are designed as integral forms [29] to track the predefined trajectories of the active and the reactive powers accurately and maintain the minimization of the steady-state error and the enhanced transient response. The surfaces can also be designed using the back-stepping and non-linear damping techniques [30].…”

Section: A Sliding Surface and Control Lawmentioning

confidence: 99%

Modeling and Direct Power Control Method of Vienna Rectifiers Using the Sliding Mode Control Approach

Ma¹,

Xie²,

Sun³

et al. 2015

Journal of Power Electronics

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This paper uses the switching function approach to present a simple state model of the Vienna-type rectifier. The approach introduces the relationship between the DC-link neutral point voltage and the AC side phase currents. A novel direct power control (DPC) strategy, which is based on the sliding mode control (SMC) for Vienna I rectifiers, is developed using the proposed power model in the stationary a b -reference frames. The SMC-based DPC methodology directly regulates instantaneous active and reactive powers without transforming to a synchronous rotating coordinate reference frame or a tracking phase angle of grid voltage. Moreover, the required rectifier control voltages are directly calculated by utilizing the non-linear SMC scheme. Theoretically, active and reactive power flows are controlled without ripple or cross coupling. Furthermore, the fixed-switching frequency is obtained by employing the simplified space vector modulation (SVM). SVM solves the complicated designing problem of the AC harmonic filter. The simplified SVM is based on the simplification of the space vector diagram of a three-level converter into that of a two-level converter. The dwelling time calculation and switching sequence selection are easily implemented like those in the conventional two-level rectifier. Replacing the current control loops with power control loops simplifies the system design and enhances the transient performance. The simulation models in MATLAB/Simulink and the digital signal processor-controlled 1.5 kW Vienna-type rectifier are used to verify the fast responses and robustness of the proposed control scheme.

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“…Further, it is reported that there also exist many other advanced control methods in the primary control. These methods include the sliding mode control [46], Lyapunov function-based control [47], model predictive control [48], robust control [49,50] and deadbeat control [51]. The main objective of all these methods is to regulate the voltage and current to track their desired values.…”

Section: Primary Controlmentioning

confidence: 99%

Distributed control of energy systems

Guo¹

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Sliding mode control approach for voltage regulation in microgrids with DFIG based wind generations

Cited by 16 publications

References 21 publications

Improved direct power control for Vienna‐type rectifiers based on sliding mode control

Improved direct power control for Vienna‐type rectifiers based on sliding mode control

Modeling and Direct Power Control Method of Vienna Rectifiers Using the Sliding Mode Control Approach

Distributed control of energy systems

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