Signal Processing and Renewable Energy
Volume:5 Issue: 1, Winter 2021

In this paper, a novel application that uses the broadband noise from a ship-of-opportunity to estimate the scattering from underwater objects is reported. The propagation is based on the normal-mode model. The source localization (location of propeller) is initially realized using incoherent broadband matched-field processing. Then, by utilizing an estimator that relies on Normal-Modes, the target echo below the sea surface is calculated to evaluate the location of the target. The proposed idea is illustrated using simulation and then verified using the acoustic data from a 2019 underwater communication trial in Grand Passage, Nova Scotia in Canada. Experimental results show that the proposed technique can be a reliable signaling method and environmentally friendly that can be applied to the fields of underwater communication and ocean monitoring for a shallow water environment.

In this paper, a method is presented to maximize the revenue from price difference due to the presence of storage systems in the power system with a high penetration level of wind resources. To account for price changes due to the profitability of price differences, a two-level model is presented that maximizes the earnings from price differences and has been carried out at a low level of market-clearing procedure. The high level uses low-level production prices and adjusts the storage outputs that affect the low-level price. Conversion techniques have been used for single-line programming with respect to system balance constraints. In order to check the performance, the proposed method will be implemented on the IEEE 118 bus test network. Analyzing the results revealed that the proposed method has improved significantly compared with the traditional method and has been able to achieve higher arbitrage income. By applying a two-level model can soften clearly the marginal price by lowering the price at peak times and raising it at non-peak times and the storage’s charging power of the traditional model is much lower than that of the two-level model at low marginal hours. The results show that proposed algorithms can increase revenue from traditional to two-level models from $ 43280 to $ 65700, respectively.

This study was conducted according to the British Standard EN ISO 81060-2 guidelines. The aim was to validate the Saadat non-invasive blood pressure (NIBP) module accur a c y and reliability against manual auscultatory general practitioners (GP), read in g s. A total of 298 measurements and comparison proced ur es were performed on 95 adults without heart disease under the supervision of two GPs. In order to represent the relationships between the test device and the reference method, the Bland-Altman graphical plotting method was used. The mean differences and standard deviations (mean ± SD differences) between the readings of the Saadat NIBP module and determination of GPs as the reference method for systolic and diastolic were exceptionally close with: -2.22 ± 6.51 mmHg and -3.31±6.27 mmHg respectively. The Saadat NIBP module fulfilled the BS EN ISO 81060-2 requirements, which states that the mean ± SD of lower than 5±8 mmHg can be recommended for clinical use.

The application of sufficiently intense electric fields to insulators induces finite currents and then the insulators become conductive. This phenomenon is called dielectric breakdown and known as a fundamental non-equilibrium and nonlinear transport phenomenon in solids. Partial discharge (PD) is a small electrical avalanche caused by locally disrupted electric fields in dielectric materialsand is known to be one of the major factors which accelerates the degradation of electrical insulation. Pollution is the most important cause of external electrical failure of the insulator, fol-lowed by the operation of relays and the exit of transmission lines from the power grid. It is believed that the flashover and partial discharge phenomena are strongly related to environmental conditions such as temperature, humidity, pressure, pollution, and even space charges. In this review paper, we will identify the types of insulators associated with pollution sources and present laboratory results while defining partial discharge and its effects on equipment.

Load frequency control (LFC) is used as part of automatic generation control (AGC) in power systems. LFC with the automatic voltage regulator (AVR) plays an important role in maintaining the frequency and constant voltage. In this paper, a method for load frequency control in reconstructed electrical systems using high voltage direct current (HVDC) line is presented. An accurate and complete model based on the control circuit and equations with HVDC controller design is considered and its parameters are optimized using the harmony search algorithm (HAS). To test the method, the power system is simulated with three-area. The simulation results show the proper performance of the power system against sudden load changes and disturbances caused by other areas.

Multi-carrier microgrids integrated by multiple energies can provide high energy supply flexibility for not only electrical end-users but thermal or gas consumers. Thus, this paper inspects the technical and economic viability of multi-carrier microgrid expansions and helps investors decide whether to invest in multi-carrier microgrid installations. The proposed model's solution determines the optimal mixture of distributed energy resources and identifies potential customers' ideal demand response intensity within a real-life industrial multi-carrier microgrid. The developed model aims at minimizing the total planning cost comprising distributed energy resources' investment and replacement, demand response enabling technology, operation, maintenance, energy demand shifting, peak demand charge, CO2e emission, and load curtailment. The design problem is formulated as mixed-integer programming and solved by GAMS 24.1. Numerical simulations reveal the proposed model's efficacy and investigate the impact of various factors on multi-carrier microgrid planning results.