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A three-channel interleaved Power Factor Correction (PFC) based on a new digital controller STNRGPF01 [7] operating in Continuous Conduction Mode (CCM) is presented in this paper. The control structure is based on a mixed signal concept where the time critical functions such as input current control and fast over current protections are performed using analog parts. All the non-time critical functions,...
With the aim to improve the energy management of battery packs in stand-alone power supply applications, a simple but effective model-based algorithm for battery state estimation has been developed. The method can be classified into the category of PI-based observers and exploits a Thevenin-based equivalent circuit to model the battery behavior associated with a simple start-up identification process...
A two-stage converter working in dual mode time sharing is proposed for single-phase photovoltaic applications. The converter encompasses a dual boost front end and a single-phase three-level Neutral Point Clamped grid inverter. According to the time sharing strategy, the boost stage is by-passed and only the Neutral Point Clamped inverter is operated when the input voltage is greater than the actual...
An over-voltage mitigation technique for open-end winding electrical drives with long power cables is proposed in this paper. In particular, a suitable dwell time is included in the switching patterns of the two inverters to minimize the over-voltage occurring at the stator terminals of this kind of systems. No passive RLC networks are required, thus avoiding additional costs and extra power losses...
In open-end winding AC motor drives, terminals of stator phases are normally connected between two inverters, normally, of the same type and size. In the present paper, an alternative configuration is studied where the machine is supplied exploiting two different converters: a main multi-level inverter and an auxiliary two-level inverter. The last operates as active power filter in order to eliminate...
The paper deals with a robust grid synchronization method for single phase highly distorted power grids. Basically, Phase Looked Loops (PLLs) are able to estimate the phase angle of the fundamental harmonic of the grid voltage used in converter control algorithm to correctly set the power transfer between the energy resource and AC grid. Moreover, PLLs also provide αβ voltage components of the grid...
This paper presents a novel control strategy translating to scalar control some energy saving control laws proposed for vector control, and forces the induction motor drive to operate at a suitable slip angular frequency, assuring loss reduction of the drive. Energy saving capability, parameter variation effects, and dynamic behavior of the scalar control technique are analyzed and experimentally...
This paper proposes a low-cost implementation of energy saving strategies in scalar control IM Drives including high speeds in a wide working range. This loss reduction control algorithm approximates and adapts to scalar control some optimized analytical relationships, proposed in vector control, for low cost implementation. Basically an “optimal” slip from the energetic point of view is calculated...
In grid-connected application of distributed generation sets, accurate estimation of the phase of the grid voltage is a fundamental task for developing reliable control algorithms, especially in single-phase systems. Many algorithms have been proposed for estimation of the phase of the voltage grid based on Phased-Locked Loop (PLL) techniques. In this paper, in order to evaluate the performance in...
Addressing high speed drives for home appliances, a new converter topology is presented for switched reluctance motor drives. Such a converter exploits high speed motor operations, high efficiency, one switch per phase and the capability to increase the system power factor. The proposed topology is based on a modified C-dump converter configuration, where the energy recovery stage acts as an active...
Unipolar current inverters generally use extra switches, or special motor requirements, to control the voltage across the freewheeling capacitor. This paper proposes two different three switches - three phases inverter topologies able to control the voltage of the free-wheeling capacitor only exploiting the phase switches. A key feature of the proposed topologies is that the free wheeling energy of...
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