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This review focuses on inverter technologies for connecting photovoltaic (PV) modules to a single-phase grid. The inverters are categorized into four classifications: 1) the number of power processing stages in cascade; 2) the type of power decoupling between the PV module(s) and the single-phase grid; 3) whether they utilizes a transformer (either line or(More)
This review-paper focuses on the latest development of inverters for photovoltaic AC-modules. The power range for these inverters is usually within 90 Watt to 500 Watt, which covers the most commercial photovoltaic-modules. Self-commutated inverters have replaced the grid-commutated ones. The same is true for the bulky low-frequency transformers versus the(More)
the drive under test. Fig. 3: Dynamometer torque-speed region shown for the first quadrant, for a 100 (K) temperature rise. Abstract-A dynamometer capable of emulating linear, non-linear and discontinuous loads for rotating systems is described. The controllable load is produced by a servo drive system. Applications for the dynamometer are steady state load(More)
This paper discusses the calorimetric measuring system. The calorimetric principle is one of the most promising methods for accurate power measurements. A calorimetric wattmeter provides a useful tool for use in the developments of new, energy-efficient, electrical components for industrial and consumer products. Power measurements can be performed with an(More)
This article gives an introduction to optimised design of power electronic circuits. The use of mathematical optimisation routines in connection with general purpose circuit simulators is discussed. A tool which connects the circuit simulator SABER with optimisation routines in MATLAB is developed. A detailed description of the optimisation of a gate-drive(More)
A novel PWM technique for voltage-source inverters, based on the idea of space vectors of switching integrals is presented. In contrast to most existing PWM methods, no explicit timing is required, smooth transition from the PWM mode to the square-wave mode is ensured, and minimum allowable widths of pulses and notches are guaranteed. The control algorithm(More)
A new control strategy for a ground power unit (GPU) is proposed, which is used for airplanes on the ground. In such a system, the ratio between the switching frequency and the fundamental frequency is low and in order to obtain high output performance, the controller has to be digital. The control is performed by a PWM-modulator and a voltage controller in(More)
High frequency power losses in power electronic components and systems are very difficult to measure. The same applies to the efficiency of high-efficiency systems and components. An important method to measure losses with high accuracy is the calorimetric measuring system. This paper describes two different calorimetric measuring systems, one for power(More)
An arrangement of a large current-source inverter and a small voltage-source inverter is proposed as the so-called tandem inverter. The tandem inverter combines technical advantages of the constituent power converters, making it an excellent choice for high-performance AC motor drive applications. In particular, it is characterized by a fast response to(More)
A three-phase inverter with four switches and four free-wheeling diodes (B4) is an alternative to the classical B6-inverter in order to reduce cost and complexity. This paper proposes a method to reduce the number of current sensors in a B4-inverter to one but still keep the knowledge of the three output currents. Different current sensing topologies are(More)
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