High voltage gain DC-DC converter is a prime requirement for renewable applications, in particular for PV. Though numerous DC-DC converter is available for increasing the voltage gain, the passive elements requirement is higher which reduces the compactness, consequently, increases the cost of the system. To address this issue, a high gain DC-DC converter is reported recently. However, the number of passive elements is quite high which increases the size. To reduce the number of passive elements and maintain the same number of semiconductor devices, in this paper, a new switched inductor arrangement is proposed which is named as switched inductor double switch DC-DC converter (SL-DS-DC). Moreover, the proposed converter has a higher gain as compared to the recently reported converter. The proposed converter is analyzed in steady state and a comparative analysis is presented to prove the suitability. Finally, the proposed converter is validated experimentally. INDEX TERMS High voltage gain, non isolated, DC-DC converter, switched inductor, CCM.

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In the research of the high-speed sensorless control strategy of an interior permanent-magnet synchronous motor (IPMSM), considering the harmonic influence of inverter nonlinearity on traditional sliding mode observer method, a full-order sliding mode observer (SMO) method based on synchronous frequency tracking filtering is proposed. This method avoids the phase delay defects caused by the use of filters in traditional second-order SMO. Then, the observed extended electromotive force (EMF) signal is filtered using a synchronous frequency tracking (SFT) function. It tracks the changing stator current and filters out harmonics that are not part of the tracking signal to achieve static tracking of the stator current. Then, the rotor speed can be estimated by a Luenberger-based observer. Experimental results verify the effectiveness and feasibility of the proposed method.

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The motivation of this paper is to bring into notice the establishment of two topologies: enhanced boost-quasi Z source inverter (EB-QZSI) and enhanced boost QZSI with an active switched network (EB/ASN-QZSI) which have poor performance than Extended switched capacitor quasi switched boost inverter (ESC-qSBI). However, ESC-qSBI has been developed before the EB-QZSI and EB/ASN-QZSI. The ESC-qSBI utilizes lesser number of inductors than the enhanced boost-quasi Z source inverter (EB-QZSI) and enhanced boost QZSI with an active switched network (EB/ASN-QZSI). In the presence of parasitics, ESC-qSBI has higher voltage gain than the EB-QZSI and EB/ASN-QZSI. Additionally, EB/ASC-QZSI has lower total voltage stress across diodes and capacitors as compared to EB-QZSI and EB/ASN-QZSI. The operation, steady state analysis, comparison and experimental analysis are discussed to prove the superorrity of ESC-qSBI over EB-QZSI and EB/ASN-QZSI.

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For high-power and high-performance speed control system, speed feedback signals are generally required. The employment of sensorless control technology makes the installation of the system easier and lower-cost, while its reliability needs to be improved. The robustness of the improved instantaneous reactive power based on the quadrature model reference adaptive system (MRAS) with respect to the variation of the motor inductance parameter is improved by selecting the appropriate reference model and adjustable model. The improved instantaneous reactive power (Q) based on model reference adaptive system (Q-MRAS) algorithm is studied by small signal analysis, and the stability of the control system is verified by the Routh Stability Criterion. The simulation models and experimental platform for the proposed control are built in the laboratory. The feasibility and superiority are verified by the corresponding simulation and experimental results.Keywords: improved instantaneous reactive power (Q) based on model reference adaptive system (Q-MRAS); sensorless control; small signal analysis, induction motor drives