A brushless generation system for microgrid operation utilizing dual stator induction generator

Abstract

Modern micro-grid needs to integrate all possible and economically attractive renewable energy resources. In many cases these generations are not smooth in nature and are situated in remote locations where regular maintenance is difficult. This paper proposes a brushless generation system using a dual stator winding induction generator (DSWIG). The power winding of the DSWIG is connected to the grid by rectifier-inverter system, whereas, the excitation winding is fed from an inverter. The generator is controlled in a way to enable terminal voltage regulation of the main winding by controlling the rotor flux through the excitation winding. Preliminary results show the capability of the system to regulate voltage and maintain constant frequency at the micro-grid. Simulations results show usefulness of such systems for micro-grid operation.

Control and performance analysis of grid‐connected variable speed wind turbine with dual stator‐winding induction generator for the contribution of both stator windings in active power transmission

“…Hence, by using (17) and setting I cQ ω = ω reted = I m , the magnetising capacitor ω exc (in pu) is obtained as (see (19)) . According to Section 3, since SEC and CW carry a portion of the generator power, the active power transmitted by the SEC at the nominal wind speed is P SEC = k (in pu), and thus, the rated capacity of the SEC, in pu, is obtained as For example, in the system under study with parameters of Table 2 (L lp = 0.09241 pu, L lr = 0.09955 pu and L m = 3.95 pu) and under conditions that the PW transmits about 50% of the generator power to the grid (k = 0.5), we have I cQ = 0.25 pu, I pp = 0.5 pu, and from (19) and (20), S SEC and ω exc are obtained as S SEC = 0.5 2 + 0.25 2 = 0.56 pu and ω exc ≃ 0.08 pu.…”

“…In [17][18][19], the DSWIG is used as the generation system for supplying AC stand-alone loads. In [20], the DSWIG is used for operation in ac microgrid. Also, in [8,21], DSWIG is employed in a grid-connected wind energy conversion system.…”

Dual Stator Winding Induction Machine: Problems, Progress, and Future Scope

“…Dual Stator Winding Induction Generator can be a potential candidate for micro-grid systems as it is a brushless and permanent magnetless system. One such topology is shown in Fig.5 [36]. Here, the two windings are on the stator which are electrically isolated but magnetically coupled.…”

“…Smoother control over voltage and frequency is expected as shown in [36]. A control algorithm to maintain DC Bus Voltage for a wind-driven DC Microgrid system under wind speed drop is proposed in [24].…”

“…DSWIG is expected to find wide-spread applications for remote area power supply system where economic and maintenance-free solutions are highly recommended [24], [36].…”