Developing a New SVPWM Control Strategy for Open-Winding Brushless Doubly Fed Reluctance Generators

Abstract

--In this paper, a new open-winding control strategy is proposed for a brushless doubly-fed reluctance generator (BDFRG) used for standalone wind turbine or ship generators. The BDFRG is characterized with two windings on the stator: a power winding and a control winding. The control winding is fed with dual two-level three-phase converters, and a vector control scheme based on space vector pulse width modulation (SVPWM) is designed. Compared to traditional three-level inverter systems, the dc-link voltage and the voltage rating of power devices in the proposed system are reduced by 50% while still greatly improving the reliability, redundancy and fault tolerance of the proposed system by increasing the switching modes. Its performance is evaluated by simulation in MATLAB/SIMULINK, and an experimental study on a 42-kW prototype machine.Index Terms--Brushless doubly-fed reluctance generator (BDFRG), dual two-level converters, open-winding, space vector pulse width modulation (SVPWM).

A novel direct power control for open-winding brushless doubly-fed reluctance generators fed by dual two-level converters using a common DC bus

“…To evaluate the performance of proposed DPC strategy, the simulation model is established in MATLAB/Simulink ® as shown in Fig. 2, and the BDFRG parameters as follows: PN = 42 kW, UNp = UNc = 380 V, pp = 3, Rp = 0.1662 Ω, Lp = 0.01737 H, Lpc = 0.01813 H, pc = 1, Rc = 0.1882 Ω, Lc = 0.02351 H, J = 0.3 kg m 2 [12].…”

“…Brushless doubly-fed machines (BDFMs) are the evolution of cascaded induction machine [1], which have been investigated as a probable alternative to the existing solutions in variable speed applications with limited speed ranges during the last decade [1]- [3], [5]- [12], [15], [16]. The main motivation for this increasing interest is due to its advantages of reasonable cost, high reliability of brushless structure and maintenance-free as well as competitive performance [1], [2].…”

“…In this paper, considering the rated capacity limits of traditional two-level converter systems [10] and advantages of traditional three-level converters systems [11], a novel DPC strategy applied to open-winding BDFRG is proposed [12]- [14] as shown in Fig. 2, where the control winding is open-circuited and fed by dual traditional two-level converters termed as MSC1, MSC2 (machine side converter, MSC) using a common DC bus (hence a single grid side converter, GSC), meanwhile, an optimized PWM scheme with common mode voltage (CMV) elimination has been implemented.…”

Optimized Power Error Comparison Strategy for Direct Power Control of the Open-Winding Brushless Doubly Fed Wind Power Generator

“…In this paper, a novel three-level converter topology is applied to the open-winding brushless doubly-fed reluctance generator (OW-BDFRG) with hybrid rotor consisting of magnetic barrier reluctance and cage rotor [22]. The control winding is open-circuited and fed by the dual two-level converters (D-TLCs) [23], [24] as shown in Fig. 1.…”

Encoderless flux vector oriented control of brushless doubly-fed reluctance generators

“…The BDFG can not only offer further cost cuts by the high reliability and maintenance-free operation of brushless construction [3], but the superior LVRT characteristics without a crowbar too due to the proportionally larger impedances, and hence reduced fault currents, than the equivalent DFIG [6], [9], [10]. Apart from the target WECS, stand-alone wind [11] and/or ship shaft power generation applications [12] are feasible.…”