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Mateo Bašić,Matija Bubalo,Dinko Vukadinović,Ivan Grgić 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
For the cost-eff ectiveness of variable-speed wind energy conversion systems (WECSs), it is extremely important to extract the maximum available power at diff erent wind speeds within the normal operating range. Furthermore, reduction of the electric generator losses additionally contributes to the effi ciency of the WECS, whereas reduction of the number of sensors is benefi cial in terms of reliability and cost. This paper presents sensorless control of a stand-alone WECS comprising a squirrel-cage induction generator (IG) and a battery system. An indirect rotor-fi eld-oriented control (IRFOC) algorithm including stray load and iron losses and online tuning of IG’s equivalent resistances and magnetising inductance is adopted for IG control to achieve high level of agreement with the actual machine. Fuzzy-logic-based optimisations of the wind turbine (WT) and IG are implemented to maximise the IG output power. The IG speed, which is required by the IRFOC algorithm, is estimated by using a model-reference-adaptive-system. The estimated IG speed is also utilised for online WT optimisation in combination with the IG torque obtained from the IRFOC equations. The performance of the proposed control strategy has been experimentally evaluated and compared with two competing sensorless control strategies for two 1.5 kW IGs of diff erent effi ciency class.
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Small-Size Induction Machine Equivalent Circuit Including Variable Stray Load and Iron Losses
Mateo Ba?i?,Dinko Vukadinovi? 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
The paper presents the equivalent circuit of an induction machine (IM) model which includes fundamental stray load and iron losses. The corresponding equivalent resistances are introduced and modeled as variable with respect to the stator frequency and flux. Their computation does not require any tests apart from those imposed by international standards, nor does it involve IM constructional details. In addition, by the convenient positioning of these resistances within the proposed equivalent circuit, the order of the conventional IM model is preserved, thus restraining the inevitable increase of the computational complexity. In this way, a compromise is achieved between the complexity of the analyzed phenomena on the one hand and the model’s practicability on the other. The proposed model has been experimentally verified using four IMs of different efficiency class and rotor cage material, all rated 1.5 kW. Besides enabling a quantitative insight into the impact of the stray load and iron losses on the operation of mains-supplied and vector-controlled IMs, the proposed model offers an opportunity to develop advanced vector control algorithms since vector control is based on the fundamental harmonic component of IM variables.
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