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Power quality is an important issue for wave energy developers, as the wave energy converters output power profile presents a lot of fluctuations due to the oscillatory nature of the waves. In order to emulate an operating direct drive wave energy converter, study power quality improvement and test different control strategies, a wave-to-wire model has been developed. Although control study for wave...
Generally, we can speed up fault location procedures and reduce the recovery time via installing telecontrolled and automated sectionalizers in distribution networks. Besides, circuit breakers can also be installed in the network to reduce the average number of users' outages. However, the number of circuit breakers (CBs) is limited by the time selectivity. In smart grid perspective, the usage of...
A single phase seven level inverter topology with fewer components using proportional integration controller is presented in this paper. The pulse width modulation is employed to generate gating signals for power switches. The proposed topology can be implemented for three phase application. The Separate dc sources can be replaced by solar PV arrays. The complete system is simulated using MATLAB/SIMULINK...
This paper gives a new approach for optimizing the total power output of a hydroelectric power station by analyzing the characteristics of efficiency function. It proofs the maximum total power supply. Under the constant head of the river, keeping each generator the same flow rate is the efficiency optimization, and the switch points are at the same efficiency points of different operating methods.
Many new cascaded multilevel inverter (MLI) topologies have recently been proposed and published in the literature. All proposed topologies demand significant amount of semiconductor components and input dc supplies, which is considered the main drawback for the implementation of three phase cascaded MLIs. This paper proposes a new generalized concept that could be employed within any existing cascaded...
In this paper, a new multilevel inverter topology which can be operated in both symmetrical and asymmetrical configurations has been proposed. In order to produce all steps of voltage at output, four different algorithms are proposed to find the value of DC sources. The proposed topology reduce switch count, gate driver circuits, total voltage blocking capability and isolated DC voltage sources which...
Random number generators are an essential part of cryptographic systems. For the highest level of security, true random number generators (TRNG) are needed instead of pseudorandom number generators. In this paper, the stochastic behavior of the spin transfer torque magnetic tunnel junction (STT-MTJ) is utilized to produce a TRNG design. A parallel structure with multiple MTJs is proposed that minimizes...
The dynamical economic dispatch problem is studied and reformulated by a distributed interior point method via a logarithmic barrier. By the facilitation of the graph Laplacian, a fully distributed primal-dual dynamical multiagent system is developed in a smart grid scenario to seek the saddle point of dynamical economic dispatch which coincides with the optimal solution. Specifically, to avoid high...
A novel, efficient multilevel inverter topology has been proposed which generates the seven level output voltage using seven power switches only along with simple and modern pulse width modulation technique. This inverter has offered the advantages of, less component count, reduced switching loss, high efficiency and low cost. Due to the less number of switch components the complexity in generation...
Integration of digital RF transmitters and digital power amplifiers (DPA) is becoming of great interest for systems-on-chip (SoCs) available in nanometer technologies [1]. Small and high-speed switching devices directly benefit switching power amplifiers in achieving peak power with high peak efficiency. However PA back-off efficiency remains a big challenge in high-data-rate systems with large peak-to-average...
Physically Unclonable Functions (PUFs) are among the most promising security primitives for low cost solutions of key storage, chip authentication, and supply chain protection. Two types of PUFs exist in literature [1–6], a “strong” PUF with a large challenge-response space [6] and a “weak” PUF providing a limited length key (chip ID) [1–5]. While the former provides better security theoretically,...
In this paper, a new three input ports generation system with open-winding generator for wind/solar hybrid generation system is proposed. By using an open-winding topology can save a set of full-controlled power electronic device, which simplifies the structure and increases the system reliability. In order to maintain the generating efficiency of PM generator, d axis current is set to zero, battery...
The switched reluctance type integrated starter generator (SRISG) has the potential to be applied in hybrid electric vehicles for its robust structure, and it does not feature a magnet. In this paper, a new double-gap SRISG design that can provide higher power is presented. Characteristics, such as torque ripple, charging ability, and efficiency, are investigated by both 2D and 3D finite element analysis...
Wind energy is one of the most promising and developed renewable energy resources. A power electronic interface is needed in order to connect a Wind Energy Conversion System (WECS) to the load or the utility grid. Control of this interface, which consists of generator- and grid-side converters, is a very important and demanding task. The main purpose of controlling the generator-side converter is...
Reliability models of doubled systems with hot and cold redundancy are suggested. The switching device can makes type I and II errors in these systems. Dynamic fault trees and Markov models are used for reliability characteristics determination.
This paper introduces a new transformerless converter topology for Multiphase-Based Wind Energy Conversion Systems (WECSs). In this topology, a twelve-phase induction generator is integrated to the grid using dual Nine-Switch Converters (NSCs) connected in series forming a high voltage cascaded dc-link. For this generator phase number, this topology reduces the total number of semiconductor devices...
In this paper, a new control strategy is proposed for the load frequency control in interconnected multi-area power systems. An unknown-input-observer based non-linear sliding mode controller is introduced to compensate the effect of unknown load disturbances and parameter uncertainties in the system. The non-linear sliding mode controller stabilizes the system dynamics by utilizing the estimated...
Due to increasing penetration of wind power generation, new challenges are originating from the intermittent nature of wind. Some of the challenges are maintaining frequency stability and output power smoothening. These will necessitate the control of wind turbines in order to maintain the stability rather than extracting the maximum power. This paper proposes a new control scheme for the output power...
The paper presents the laboratory based model of an “Energy Management Unit” for the optimum use of the electricity produced from alternative sources like biogas plant and solar photovoltaic system at an agriculture farm. The electrical energy produced at the farm is distributed among the loads according to the availability and requirement. A diesel generator is used as a backup at the farm. If the...
This paper analyzes a compensating control strategy for stable energy output of the novel direct drive wave energy generator. We propose a compensating control structure based on the unstable second-order linear dynamics for the direct drive wave energy generator, and the dynamics are derived by the on-line system identification method. In the control strategy, we design a servo compensator located...
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