The optimal reactive-power compensation problem solving consists of finding the optimal combinations of the capacitors and their locations in a network in a way that technical requirements are satisfied and maximum economical effects are achieved. An approach to the optimal reactive-power compensation in distribution networks based on simulated annealing method and deterministic initialization ...

In this paper, the authors propose a new three-phase, nine-level inverter with self-balancing of capacitors voltages. The proposed is result serial connection SPUC topology and NPC converter. A single DC source used, each phase made up nine power switches three capacitors. Two control techniques are to maintain voltages at desired values, first which PWM technique ensures in open loop without u...

This paper presents multi-step capacitor switching methods for SAR ADCs based on precharge with floating capacitors and charge sharing. The proposed switching methods further reduce the transient power of the split monotonic switching method (an improved version of the monotonic switching method). Compared to the split monotonic switching, adding charge sharing achieves around 50% reduction in ...

A Modular Multilevel Converter (MMC) is an attractive solution for power conversion without transformers. As MMC consists of cascade connections and floating dc capacitors, it requires continuous voltage monitoring. An adaptive observer design has been presented to estimate the capacitor voltages from the measurement of arm currents. This work introduces a capacitance value of the cell capacito...

We consider two electric RLC resonance networks that are equivalent to quantum billiards. In a network of inductors grounded by capacitors, the eigenvalues of the quantum billiard correspond to the squared resonant frequencies. In a network of capacitors grounded by inductors, the eigenvalues of the billiard are given by the inverse of the squared resonant frequencies. In both cases, the local ...

This paper is a licentiate compilation-thesis that aims to bring clarity to the dimensioning aspects and limiting factors of modular multilevel converters. The dc-capacitor in each submodule is a driving factor for the size and weight of the converter. This means that it is important to distribute the stored energy evenly among all submodule capacitors. Typically, an increased switching frequen...

This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract—In this paper, SHM (Selective Harmonic Mitigation) and SHE (Selective Harmonic Elimination) modulation techniques have been combined to produce appropriate pulses for four-leg three-level NPC (Neutral Point Clamped) inverter. In...

We present a simple, high-sensitivity, array-based capacitive sensor for biological applications. The circuit can accurately sense ungrounded coupling capacitances, while strongly attenuating the effect of unwanted parasitics. It can also perform capacitance-voltage profiling of nonlinear biological capacitances at very low voltages. We implement a dual input frequency ∆Σ modulator to perform i...

-This paper presents a comprehensive on-line electrical characterization technique addressing the emerging Si/SiGe MOS technology. It demonstrates that the experimental high frequency and low frequency C V characteristics of Si/SiGe heterostructure MOS capacitors can provide accurate material-, process-, and device-related information such as: the valence band offset, Si cap layer thickness, su...