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This paper presents the voltage-controlled oscillator (VCO) less phase-locked loop (PLL)-based control of voltage source converter. It is used in the distributed power generation system for improved power quality. This control extracts the fundamental component from the sensed load current using three phases to alpha-beta transformation without using VCO, unlike synchronous reference frame-PLL, where fundamental component extraction needs two transformations with the use of VCO. Owing to the absence of VCO in the proposed method, the computational burden of trigonometric operations is very less that results in a faster dynamic response under variable conditions. This characteristic makes it suitable for the distributed power generation system, where fast changes occur frequently. In this study, wind-based distributed generation system has been taken for study, which comprises of self-excited induction generator feeding non-linear load with varying electrical conditions. Using the proposed control, the reactive power compensation, harmonics reduction and load balancing are carried out in the system. In addition to it, neutral current compensation is also accomplished with the help of star-delta transformer connected at the load end. The system performances are investigated under steady state as well as in transient state and results are found satisfactory.

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Summary The electric vehicle promotion in the backdrop of environment and climate issues is very important. In this paper, bidirectional converter for an electric vehicle battery charging along with features to mitigate the harmonics and reactive power in a residential installation is presented. It consists of adaptive transverse filter for the detection of fundamental component of the load current. The additional tasks are assigned to an electric vehicle charger for power quality improvement. This leads to reduction in cost for utility and a revenue generating scheme for the vehicle owner. Thus, the power quality indices are evaluated for the bidirectional interface (inherent to the on board power electronic equipment of the vehicle) in charging and discharging modes of the battery. The performance of the proposed converter is validated with the prototype system of same specifications. The performance results are obtained during charging and discharging modes with steady‐state and dynamic conditions.