Reducing greenhouse gas emissions becomes a top priority in the world with emergence of global warming and environmental problems. Various renewable energies appear during last decades. Ocean captures stores huge amounts energy, which could satisfy five times energy demand. Due to technology limitations economic considerations, marine current appears most attractive choice compared other ocean form. Although existing expertise offshore wind conversion system can be partially transferred due...

Around the world, development of electric vehicles is underway, including in maritime transportation. However, clean energy vessels still has a long way to go. Fuel cells (FCs) are relevant choice among many sources power vessels. due complex and drastic change shipload power, FCs need be equipped with dynamic fast-response storage equipment make up for it. For multiple devices connected parallel, state charge (SOC) not balanced, which affects their service life stability vessel microgrid,...

This paper analyzes a topology consisting of permanent-magnet synchronous generator and Vienna rectifier for wind energy conversion system. A control strategy leading to maximum efficiency is proposed. Simulation results reveal that this configuration advantageous with respect compared traditional six-switch two-level converter. Experimental are provided demonstrate the feasibility proposed

This paper provides a model and control of marine current energy conversion system. The modeled system is 10-kW generating with low-speed doubly salient permanent magnet generator 50rpm. First, the resource, turbine, dynamic analytical are developed. Second, due to variations speed, which may lead strong fluctuations in power extracted by strategies for at both low high speeds analyzed, assessed, compared. Finally, simulations proposed carried out, modeled, simulated on MATLAB/Simulink software.

This study mainly investigates the current and speed control strategies of a doubly-fed induction generator (DFIG), which is applied to tidal stream turbine (TST). Indeed, DFIG using integer-order PI (IOPI) controller has been widely proposed in applications with similar system, especially wind energy conversion system (WECS). However, these conventional controllers cannot deal problems caused by parameter variations satisfactorily under complex harsh operation conditions, may even...

Wave compensation technology is crucial to the safety of ship operation and accurate placement load. Its efficiency gentle change rope tension are particularly important. In this paper, we adopt permanent magnet synchronous machine (PMSM) as actuator construct basic wave system. Firstly, motion model load under action established, fractional-order PID (FOPID) controller for position loop PMSM introduced. Then, parameters FOPID optimized by genetic algorithm-particle swarm optimization...

High-voltage circuit breakers are the core equipment in power networks, and to a certain extent, related safe reliable operation of systems. However, their components prone mechanical faults. This study proposes component separation method detect multiple faults that can achieve online real-time monitoring. First, model strategy presented for obtaining voiceprint signals from breakers. Subsequently, was used decompose into individual signals. Based on this, recognition features single-fault...

<div class="section abstract"><div class="htmlview paragraph">The permanent magnet synchronous motor (PMSM) has become the preferred driving technology in robotic control engineering due to its high-power density and excellent dynamic response capability. However, traditional vector strategies, while widely used, reveal certain limitations their reliance on high-precision sensors complex coordinate transformation calculations. These affect performance of robots high-speed...

Short term wind forecasting is a very important work to the operation of farms and power systems. In this paper, ARCH (Autoregressive Conditional Heteroscedasticity) effects data series are analyzed with Eviews software. Firstly, an ARMA Moving Average) model speed time built. Secondly, effect residual tested by Lagrange Multiplier, corresponding ARMA-ARCH set up. Lastly, performances compared model. Validation proved. And results show that possesses higher accuracy.

Meminductor, a nonlinear device with memory ability and controllable meminductance, was generalized on the basis of conception memristor. Currently, meminductor is still unavailable market. Therefore, in order to investigate its properties potential application, designing electronic emulator significant importance. In this paper, flux-controlled memristive using ligh-dependent resistor (LDR) proposed mutator for transferring memristor into flux controlled described, which realization two...

The Ocean, which covers two-thirds of the world, captures and stores huge amounts energy. Several sources energy can be used. This paper presents a brief review state art on marine tidal current generation technology. purposes are as follow: first part concerns conversion into mechanical energy, synthesis existing methods modeling resource turbine presented. second is dedicated to electrical by taking account power converters for control grid connection. Some simulation results briefly shown...

Nowadays, Dynamic Positioning (DP) is applied to various tasks such as subsea pipeline laying and the requirements for positioning performance in marine operations are higher higher. The main objective of this paper design a DP controller based on Active Disturbance Rejection Control (ADRC) solve problems long response time, large overshoot low accuracy ship positioning. Firstly, mathematical models environmental disturbances established. Secondly, basic principle ADRC described. Meanwhile,...

Due to the harsh and changeable marine environment, one low speed stator-permanent magnet machine named doubly salient permanent with toothed pole is applied for current energy conversion system. Indeed, this has simple structure, intriguing fault tolerance, higher power density, which could adequately satisfy different complicated operation conditions. However, its flux-linkage same variation period as inductance leads a strong nonlinear coupling Moreover, torque ripple caused by special...

Modeling the volatility in load time series can contribute to improving performance of short-term forecasting (STLF). In this work, capture nonlinear characteristics volatility, regime switching is investigated. By combining regime-switching models with Generalized Auto-Regressive Conditional Heteroscedastic (GARCH) models, two types regime-swithcing GARCH Threshold (TAR-GARCH) and Logistic Smooth Transition (LSTAR-GARCH) are studied. addition, LSTAR effectively used handle discontinuity...

Considering the depletion of oil, coal, gas and other fossil energy, increasingly serious environmental pollution, all countries in world are developing clean renewable such as wind water solar etc., to alleviate current energy crisis. Tidal belongs marine energy. It is clean, pollution-free, abundant, with a good prospect development due its similarity This paper firstly analyses reserves distribution tidal China. Then early exploration Current Power Generation System (TCPGS) China briefly...

The wave compensation system can be very useful in several naval applications. It greatly reduce the relative irregular motion between two ships when replenishment operations are performed, or ship and offshore platform, which is caused by waves. widely used operations, cargo transfer, oil gas exploitation, deep-sea mining, hoisting recovery of submersibles, etc. However, a crane moving due to influence hull, load movement similar space ball pendulum, causes heave displacement show...

The efficient wind power forecasting is of great significance for the safety and stability grid. Analysis on high order moment time series play an important role in improving accuracy power. With rolling subsample generalized auto-regressive conditional heteroskedasticity with skewness kurtosis (GARCHSK) model sequence, analysis method proposed. dynamic curves parameter are presented by estimating characteristic parameters models. Moreover, time-varying structure analyzed. A Generalized News...

This paper sets forth a novel dc-based topology utilizing series-connected permanent-magnet synchronous generators for offshore wind farms, as an alternative to the common ac topology. The system's design, namely, individual turbine power electronics, collection system topology, and overall control is presented. An efficiency analysis suggests that proposed dc leads energy savings due reduced number different type of conversion stages, well variable-voltage strategy. stability operation...