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Home appliances are responsible of a significant part of residential energy consumption and have a major impact in the overall energetic system efficiency. Most of them perform an indirect ac-dc-ac conversion in order to obtain the required output voltage level and frequency, depending on the applications. Thus, a high-efficiency and power density converter is required for this application where cost-effectiveness...
Three-phase voltage-source inverters are becoming widely used in grid applications, due to the increased utilization of renewable energy resources such as photovoltaic (PV) systems. The connection of the inverter to the grid must not deteriorate the voltage quality at the point of the common coupling (PCC). Therefore, the injected current harmonics must not exceed certain level. Reduction of the injected...
The switching frequency at which the inverter operates is an important parameter that significantly affects the operation of the inverter. In this paper, a new variable switching frequency algorithm is proposed in which the switching frequency is varied in response to the variation in the operating conditions. The proposed algorithm is based on multi-objective optimization problem formulation such...
This paper presents a maximum efficiency point tracking algorithm for Wireless Power Transfer (WPT) to match the load impedance to that of the source impedance. Conventionally, the load is considered only resistive in the literature. In most of the applications the battery is the end load and the equivalent circuit of battery consists of resistive and reactive elements. Therefore, to improve the overall...
This paper presents the carrier signal injection based sensorless control of permanent magnet synchronous machine (PMSM) drives with limited inverter switching frequency. Accounting for the influence of stator resistances, the amplitude of carrier current utilised for position tracking can be maximized under an optimized injection frequency, with which signal to noise (S/N) ratio of carrier signal...
This paper deals with issues of Contactless power converter (CLPC) including converter constitution, circuit model, power transmission and power regulation. Based on a newly developed equivalent load circuit, the influences of contactless transformer (CLT) and its spacing on the energy transmission of the CLPC are investigated. It is found that the relationship between the power transmission and the...
The increased demand for grid-connected inverters for connection of renewable energy sources raises the issue of harmonics injected to the grid. Such inverters must comply with the standards specification of current harmonics injected to the grid. Such regulations can be maintained using passive filters connected between the inverter and grid. Design of such filters is a challenging problem when considering...
This paper presents an electronic ballast to operate HO fluorescent lamps with power ratings of 24 W, 39 W and 49 W. The proposed circuit detects the lamp type by its operation voltage and sets duty cycle of the power factor correction circuit to adequate the output power. Experimental results are shown to demonstrate the feasibility of the proposed solution.
For longer life of alternating-current (ac) machines, it is desirable to feed them by sinusoidal voltages. This can be achieved by connecting an filter between the voltage source inverter and the motor. However, the filter creates unwanted oscillation at system resonant frequency. A resistance connected in series with the capacitor is a solution to damp out the resonant-frequency oscillation,...
The three basic nonisolated DC-DC converter topologies are here compared in a single phase grid tied photovoltaic application, from an efficiency and reliability perspective. A general design procedure which attempts to maximize the switching frequency has been established and followed for all the topologies. A MATLAB® model representing the sources of losses has been developed to evaluate the efficiency,...
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