Optimal power extraction control schemes for five-phase PMSG based wind generation systems

Youssef

Int Trans Electr Energ Syst

et al. 2019

Summary To eliminate problems of traditional perturb and observe (TPO) maximum power point tracking (MPPT) relying on large scale variable speed wind energy conversion system (VS‐WECS), this paper suggests a variable step size perturb and observe (VS‐PO) MPPT algorithm. The VS‐PO technique is performed to split the power‐speed (P‐ω) curve with four segments every with a particular step size. A large step size is chosen for the two segments distant from the MPP. Otherwise, a smaller step size can be implemented. The proposed algorithm can achieve the maximum power without large oscillations and reduce the settling time under different wind speed conditions, which means high tracking efficiency. Moreover, the model reference adaptive control (MRC) is applied instead of a PI controller to regulate the rotor speed, which maximizes the extracted power. Also, the MRC successful for reducing the large oscillation and settling time compared with the PI controller. The suggested control technique is tested over a 1.5 MW DFIG WECS by MATLAB/Simulink software.

Section: Simulation Results and Discussionmentioning

confidence: 99%

Variable step size PO MPPT algorithm using model reference adaptive control for optimal power extraction

Youssef

Int Trans Electr Energ Syst

et al. 2019

“…results of the proposed four-sector technique are compared with the conventional P&O, using the small and large fixed step size under climate conditions to reveal the effectiveness of the proposed algorithm. To validate the performance of the proposed MPO algorithm, the theoretical average output power ( P th ) overall time is compared with the actual grid power integration ( P g ) expressed as [41]:…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…To investigate the dynamic model of the multi-phase PMSG and the d-q components of stator voltages in the synchronous reference frame, the extended Park's transformation are used [36,41]:…”

Section: Multi-phase Pmsg Dynamic Modelmentioning

confidence: 99%

Modified P&O MPPT algorithm for optimal power extraction of five-phase PMSG based wind generation system

2019

Self Cite

In this study, the maximum power point tracking (MPPT) performance is investigated based on variable-speed wind energy conversion system below the rated wind speed. The proposed modified perturb and observe (MPO) MPPT enhances the initial speed-tracking accuracy and eliminates the oscillations level. The MPO employs four sectors operation using a variable-speed step sizes by comparing the new suggesting curve with the P-ω curve. The system is described as a large-scale five-phase permanent magnet synchronous generator (PMSG) which is grid connected through a backto-back converter (BTBC) and Dc-link capacitor. The field-oriented control (FOC) is applied in the machine-side converter (MSC) to extract the optimal generated power using the proposed MPPT algorithm. Moreover, the voltage-oriented control (VOC) is applied in the grid-side converter (GSC) to regulate the Dc-link voltage and inject active power with unity power factor. The simulation results depict the superior performance of the MPO over the conventional P&O. The performance of the proposed control scheme is validated using MATLAB/SIMULINK program.

“…In WECS, the wind kinetic power is converted to mechanical power using WT. Input wind power P w to the WT can be expressed as [45][46][47]:…”

Section: Wind Turbine Modelmentioning

confidence: 99%

An efficient variable-step P&O maximum power point tracking technique for grid-connected wind energy conversion system

et al. 2019

Self Cite

This paper proposes an efficient modular sector variable-step perturb and observe (VSPO) maximum power point tracking algorithm. The proposed algorithm enhances the speed tracking and minimizes oscillations level problems associated with traditional P&O methods. The routine of generating the variable step sizes depends on splitting the (P-ω) characteristic curve of wind turbines into modular sectors, in which the perturbation step size for each sector is selected by comparing a suggested ratio with another specified ratio designed according to the required accuracy. By continuously observing the distance between the actual rotor speed and the optimal rotor speed, the VSPO technique applies variable perturbation step sizes according to the current operating sector. Moreover, a wind speed estimation technique is used as a replacement of distributed anemometers for tracking the optimal rotor speed at different wind speeds. The studied system configuration includes three-phase back-to-back converter which is used to connect a 1.5 MW permanent magnet synchronous generator into the utility grid. Furthermore, the model predictive control is used for current control loop in the machine-side converter. To demonstrate the performance of the proposed algorithm, its simulation results are compared with the simulation results of conventional P&O technique under step and random wind variations. In addition, the algorithm performance is studied with real wind data (Hokkaido Island, Japan) using MATLAB/SIMULINK environment. Simulation results show that the VSPO ensures the high tracking speed of maximum power point, while the steady-state oscillation is significantly reduced. The proposed algorithm enhances the system efficiency by 3.5% over the conventional one.