Analytical expression for LVRT of BDFIG with enhanced current control to CW and reactive power support from GSC

Huang, Jiejie; Li, Shenghu

doi:10.1016/j.ijepes.2017.12.005

Cited by 24 publications

(18 citation statements)

References 27 publications

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“…In steady state, the differential and resistance terms can be removed, from (4) and (5), ψ pd ≈ 0, ψ cq ≈ 0. Then according to (3)- (14), the generator's vector diagram in the rotating coordinate system can be depicted as follows:…”

Section: Operation Analysis Of Internal Variables Of Generator With Amentioning

confidence: 99%

Dynamic analysis and oscillation elimination of brushless doubly fed wind power generation system during symmetrical voltage dips

Nie

Wang

Kong

2021

IET Renewable Power Gen

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In the dynamics of grid‐connected operation of brushless doubly‐fed generators, grid voltage dips can cause the extreme imbalance between the voltage and the back electromotive forces in power winding. When these imbalances are combined with the influence of the inertia link composed of converter and generator, a serious over‐current and current oscillation forms in power winding and control winding. This paper gives a process analysis and proposes an improved control to the system during the low voltage ride through event. According to the mathematical model of the generators, the correlation between the power winding and control winding currents is established and then a fully equivalent simplified model is obtained accordingly. When the voltage suddenly drops to zero, the analytic expressions of power winding and control winding are calculated in the complex frequency domain and the influence factors of overshoot and oscillations are analyzed. The conventional control method relies on limited PI regulation that cannot eliminate the oscillations completely. It is found that after adjusting a proportional coefficient and eliminating the integral link of the control winding current controller, the order of the control system reduces. Therefore, the generation system can quickly recover to a steady state without oscillations. Finally, the analysis and improvement are verified by the simulation model and experimental results.

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Section: Operation Analysis Of Internal Variables Of Generator With Amentioning

confidence: 99%

Dynamic analysis and oscillation elimination of brushless doubly fed wind power generation system during symmetrical voltage dips

Nie

Wang

Kong

2021

IET Renewable Power Gen

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“…To date, the crowbarless LVRT control schemes for BDFIGs developed in [63]- [67] are all essentially implemented in the rotating reference frame. LVRT The control strategies proposed in [63] and [64] can compensate for the couplings between the two axes of the CW current, with different compensation terms. The simulation results in [63] and [64] show that the BDFIG cannot ride through severe low-voltage dips with the proposed control strategies.…”

Section: B Lvrtmentioning

confidence: 99%

Recent Advances of Control Technologies for Brushless Doubly-Fed Generators

Liu

Hussien

Shao³

et al. 2021

IEEE Access

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The brushless doubly-fed generator (BDFG) is a kind of dual-electrical-port field-modulated electrical machine containing two sets of stator windings with different pole pairs. The stator power winding undertakes most of the power inflow and outflow, and the stator control winding connected to the power converter can be utilized to regulate the machine operation status. Consequently, the rotor no longer needs to be supplied by the power converter, so that the brushes and slip rings can be removed. The BDFG can be used for grid-connected power generation as well as standalone power generation. This paper reviews recent advances of control technologies for BDFGs under different operation conditions, e.g., gridconnected ac power generation with normal and faulty grids, standalone ac power generation with normal and special loads, and dc power generation. The progresses of sensorless control technologies for BDFGbased power generation systems are also discussed. The classification and comparison are carried out to discover the similarities and differences between theses control technologies. This paper is in the hope of inspiring new, ground breakings and progresses for high-performance BDFG power generator applications.

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“…These energy conversion types utilize numerous gearbox stages, which can work in a limited range around the synchronous speed and require separate capacitor banks to provide essential reactive power 9 . This methodology is currently moving toward the variable speed wind turbines such as DFIG with wounded windings, while the back‐to‐back power converter controls the torque, speed, and partial power via wide operating speed range within ±30% of the synchronous speed 10–12 …”

Section: Introductionmentioning

confidence: 99%

Synchronization and frequency control strategy for doubly fed induction generator based on adaptive high‐order sliding mode controller

Zare

2021

Int J Numerical Modelling

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Since the DFIGs have been widely used in the modern electric power system, they must participate in the frequency regulation and active power generation during different internal and external disturbance conditions. The amassed kinetic energy in the rotating components due to acceleration and deceleration operating conditions can appropriately support the active power generation. Loss of the rotor speed equilibrium leads to overspeed of the DFIG's rotor and accordingly instability condition. An imbalance between power generation and demand can create a significant deviation in the frequency of the power system, that is, the speed and frequency of the generator increase due to reduced load and increased power, and vice versa. Hence, the frequency of the power system is basically considered a prominent measure for maintaining the balance of active power, while various frequency regulation strategies such as inertial response and frequency control have been widely used for DFIG. On the other hand, the synchronization control‐based power generation by DFIG can cause an instability condition during the severe disturbances. This paper proposes ASCS‐AHSMC to accurately regulate the system frequency and maintain the synchronization. To appraise the performance of the proposed controller, it has been compared with the conventional SMC and Fuzzy‐based SMC. Furthermore, DFIG experiences less stable conditions under different wind variation models and short circuit to validate the controllability of ASCS‐AHSMC. Finally, the performance of the ASCS‐AHSMC has been well approved under different disturbance conditions as compared with the conventional SMC and the Fuzzy‐based SMC.

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Analytical expression for LVRT of BDFIG with enhanced current control to CW and reactive power support from GSC

Cited by 24 publications

References 27 publications

Dynamic analysis and oscillation elimination of brushless doubly fed wind power generation system during symmetrical voltage dips

Dynamic analysis and oscillation elimination of brushless doubly fed wind power generation system during symmetrical voltage dips

Recent Advances of Control Technologies for Brushless Doubly-Fed Generators

Synchronization and frequency control strategy for doubly fed induction generator based on adaptive high‐order sliding mode controller

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