In the most recent heuristic methods, the high potential buses for capacitor placement are initially identified and ranked using loss sensitivity factors (LSFs) or power loss index (PLI). These factors or indices help to reduce the search space of the optimization procedure, but they may not always indicate the appropriate placement of capacitors. This paper proposes an efficient approach for t...

This paper presents the design and application of an efficient hybrid algorithm for solving Optimal Reactive Power Flow (ORPF) problem. The ORPF is formulated as a nonlinear constrained optimization problem where active power losses must be minimized. proposed approach based on hybridization Particle Swarm Optimization (PSO) Tabu-Search (TS) technique. PSO-TS used to find settings control varia...

Title of Document: RELIABILITY EVALUATION OF LIQUID AND POLYMER ALUMINUM ELECTROLYTIC CAPACITORS 45BAnshul Shrivastava, Doctor of Philosophy (Ph.D.), 2014 Directed By: Professor Michael Pecht, Department of Mechanical Engineering Liquid aluminum electrolytic capacitors are known for their reliability problems. They are considered as the weakest link in the power electronics system. The liquid e...

this paper presents a comprehensive case study on electro-mechanical analysis of mems[1] variable capacitors. using the fundamental mechanical and electrical equations, static and dynamic behaviors of the device are studied. the analysis is done for three different modes, namely: dc (static mode), small signal ac and large signal regime. a complete set of equations defining dynamic behavior of ...

Electrolytic and metallized polypropylene film (MPPF) capacitors are among the most popular capacitors used in electronic equipments. The choice of capacitors is of major importance because one of the most frequent causes of the equipment breakdowns results from the failure of capacitors, and will therefore determine the overall lifetime of the system. Electrolytic capacitors present higher cap...

This paper presents a novel 13-level switched capacitor multilevel inverter, which uses less devices to achieve six-fold voltage gain. The proposed topology structure consists of twelve transistors, two diodes, and three capacitors. It is worth mentioning that characteristics as having five complementary switch pairs self-balanced electric capacity voltages are conducive simplifying the control...

This article presents a discontinuous modulation (DM) strategy for static compensators (StatComs) based on cascaded H-bridge (CHB) converter with star configuration. The proposed DM considers the capacitor voltage oscillations at twice fundamental frequency and effect of zero-sequence injection voltages. Considering these effects is especially important in CHB-StatComs large ripples (low-capaci...

This paper presents the concept and results of a novel resonant DC-DC converter which achieves high voltage gain at low number utilized switches, stress on transistors, ZVS ZCS operation, efficiency variable gain. The uses switched-capacitors (SC) circuits with five switches allows it to reach six-fold By application adequate switching patterns, seven levels adjustment can be achieved. basic op...

Assigning gate supply voltage and transistor threshold voltages to a range of discrete values is a combinatorial problem. The optimization computational difficulty grows exponentially with the netlist size. Whereas, if the range of values is continuous, we show that the global optimum can be found in polynomial time. We show that posynomials can model variable supply and threshold voltages, wit...

We propose a modular multilevel converter (MMC) based three-phase four-wire (3P4W) split capacitor distribution static synchronous compensator (DSTATCOM), aiming at compensating unbalanced and reactive load currents. Due to the zero-sequence current compensation, circulating characteristics of 3P4W MMC-DSTATCOM are different from conventional MMCs. Moreover, distinct working principle MMC would...