Self-filtering based on the fault ride-through technique using a robust model predictive control for wind turbine rotor current




HIGHLIGHTS
  • What: This strategy works on fault mode which depends on fault ride-through technology, with the primary goal of protecting the WF from external influences stemming from the electrical grid (voltage drop).. The aim of this research is to introduce a novel model designed to mitigate electrical grid distortions arising from nonlinear loads, which, in turn, lead to mechanical fatigue in electric generators. The aim involves transmitting the Ps and Qs reference values to each WT. Validation and discussion This section of the research paper serves to confirm the validity and efficiency of the designed management technique.
  • Who: Abdelkader Achar from the Department Liabes University, Istanbul, Turkey have published the research work: Self-filtering based on the fault ride-through technique using a robust model predictive control for wind turbine rotor current, in the Journal: Scientific Reports Scientific Reports
  • How: This paper introduces a management and control approach with self-filtering capabilities taking into account fault ride-through considerations.
  • Future: A summary of the works carried out and the mention of future works are presented.
SUMMARY

    Non-linear loads absorb non-sinusoidal currents, acting as generators of reactive power (Qs) harmonics causing power factor (PF) degradation, which is undesirable. The d-q rotor currents are defined as follows: Irq_i=irq- reg1_i + irq- har_i ref ref ref ref ref ref Ird_i=ird- reg1_i + ird – har_i The following formula can be used to describe the voltage equation of the rotor in the synchronous rotation ­condition82: vrd_i=Rr ird_i + σ Lr dtd ird_i – gi ωs σ Lr irq_i vrq_i=Rr irq_i + σ Lr dtd irq_i + gi ωs σ Lr ird_i + gi LmLsVs Grid-side converter currents are synced with the grid voltage`s Park reference frame. Non-linear loads with low current values (2-50 A). | Vol:(1234567890) 14:1905 | Irq-meas Rotor currents (Ird and Irq) (A) Irq-ref Ird-meas Fault L-G Ird-ref Fault L-L-G Time (s) Fault (L-L-G) Fault (L-G) Rotor current Ir (A) Time (s) 2. FS-MPC technique increases performance compared ­to52,67,69,91-96, but its biggest benefit is the reduction of THD compared ­to52,67,69,91-96, which did not exceed 0.26-0.32%, indicating superior power quality. | 14:1905 | 27 Vol.:(0123456789) Isq-meas Stator currents (Isd and Isq) (A) Isq-ref Isd-meas Isd-ref Fault (L-L-G) Fault (L-G) -1500 -2000 Time (s) Fault (L-L-G) Fault (L-G) Stator current Is (A) Time (s) It successfully facilitates coordination among DFIG units, aligning with the require- | Vol:(1234567890) 14:1905 | Fault (L-G) Fault (L-L-G) Voltage (V) Time (s) ments of the electrical grid. THD (%) Times (s) Before harmonic current compensation After harmonic current compensation Ratios (%) After harmonic current compensation Ratios (%) After filtering @@

LAY DEFINITIONS
  • turbine: A turbine is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. A turbine is a turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached
  • Electrical grid: An electrical grid, electric grid or power grid, is an interconnected network for delivering electricity from producers to consumers. It consists of: * generating stations that produce electric power; * electrical substations for stepping electrical voltage up for transmission, or down for distribution; * high voltage transmission lines that carry power from distant sources to demand-centers; * distribution lines that connect individual customers
  • Power factor: In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of u22121 to 1. A power factor of less than one means that the voltage and current waveforms are not in phase, reducing the instantaneous product of the two waveforms
  • fault: In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movement. Large faults within the Earth`s crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults
  • Maximum power point tracking: Maximum power point tracking (MPPT) or sometimes just power point tracking (PPT) is a technique used commonly with wind turbines and photovoltaic solar systems to maximize power extraction under all conditions. Although it primarily applies to solar power, the principle applies generally to sources with variable power: for example, optical power transmission and thermophotovoltaics
  • Fundamental Frequency: The natural frequency, or fundamental frequency, often referred to simply as the fundamental, is defined as the lowest frequency of a periodic waveform. In music, the fundamental is the musical pitch of a note that is perceived as the lowest partial present
  • wind: Wind is the flow of gases on a large scale. On the surface of the Earth, wind consists of the bulk movement of air

Licence: cc-by

Site reference: https://www.nature.com/articles/s41598-023-51110-3.pdf

DOI reference: https://www.doi.org/10.1038/s41598-023-51110-3

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