An overview of numerical and mathematical modelling-based distributed generation (DG) system optimisation techniques is presented in this review paper. The objective is to compare different aspects of these two broad classes of DG optimisation techniques, explore their applications, and identify potential research directions from reviewed studies. Introductory descriptions of general electrical power system and DG system are first provided, followed by reviews on renewable resource assessment, load demand analysis, model formulation, and optimisation techniques. In renewable resource assessment model review, uncertain solar and wind energy resources are emphasised whereas applications of forecasting models have been highlighted based on their prediction horizons, computational power requirement, and training data intensity. For DG optimisation framework, (solar, wind and tidal) power generator, energy storage and energy balance models are discussed; in optimisation technique section, both numerical and mathematical modelling optimisation methods are reviewed, analysed and criticised with recommendations for their improvements. In overall, this review provides preliminary guidelines, research gaps and recommendations for developing a better and more user-friendly DG energy planning optimisation tool.

Review of distributed generation (DG) system planning and optimisation techniques: Comparison of numerical and mathematical modelling methods

Mathematical models are proposed, and on their basis, software is developed. Methods of the risk theory are used to minimize the risks. Risk is a consequence of the impact of uncertainty on the achievement of goals. A consequence of influence in the paper refers to the deviation from the goal, expressed in the expected results and the deviation of certain criteria indicators. In this case, we mean any measure of quality. In its turn, risk factors reduce criteria indicators. These factors are divided into categories: general transportation risks and risks of transporting ground. In these categories, one may derive the following risks: incidents at transport resulting from the impact of a set of random factors, including the human one. Furthermore, it should be noted that the occurrence of a risk situation could determine and have a direct impact on the other. As a result, you may experience a chain of risks connected to each other.

Mathematical Models for Solving Problems of Reliability Maritime System

The paper describes the process of creating of BLDC's digital control system. The BLDC has no speed sensor, so back-EMF method is used for commutation control. Authors show how to model the control system in MatLab/Simulink and to test it onboard STM32F4 microcontroller.

Designing of sensoreless control system for brushless direct current motor

Most projects of similar research are applied and become known mainly due to their commercial implementation. Undoubtedly, in the modern realities, it is more and more difficult to conduct scientific research regardless of the urgent production problems. Thus, cooperation of commercial structures, research institutions, military departments, etc. is required for the successful implementation of most projects. Certainly, the results of such projects can be effectively used by all the organizations listed above. For example, almost any innovation in the surveillance and search, under-ice and other studies in one form or another can be used for strategic or tactical military purposes.

https://www.jvejournals.com/article/17335/pdf

The study of the process of the development of marine robotics

Picture fuzzy model is a generalized structure of intuitionistic fuzzy model in the sense that it not only assigns the membership and nonmembership values in the form of orthopair ( μ , ν ) to an element, but it assigns a triplet ( μ , η , ν ) , where η denotes the neutral degree and the difference π = 1 − ( μ + η + ν ) indicates the degree of refusal The q-rung picture fuzzy set( q -RPFS) provides a wide formal mathematical sketch in which uncertain and vague conceptual phenomenon can be precisely and rigorously studied because of its distinctive quality of vast representation space of acceptable triplets This paper discusses some properties including edge regularity, total edge regularity and perfect edge regularity of q-rung picture fuzzy graphs (q-RPFGs) The work introduces and investigates these properties for square q-RPFGs and q-RPF line graphs Furthermore, this study characterizes how regularity and edge regularity of q-RPFGs structurally relate In addition, it presents the concept of ego-networks to extract knowledge from large social networks under q-rung picture fuzzy environment with algorithm

https://www.mdpi.com/2073-8994/11/4/489/pdf

A Novel Description on Edge-Regular q -Rung Picture Fuzzy Graphs with Application

This paper deals with the methods for investigating the nonlinear dynamics of discrete chaotic systems (DCS) applied to piecewise linear systems of the third order. The paper proposes an approach to the analysis of the systems under research and their improvement. Thus, effective and mathematically sound methods for the analysis of nonlinear motions in the models under consideration are proposed. It makes it possible to obtain simple calculated relations for determining the basic dynamic characteristics of systems. Based on these methods, the authors developed algorithms for calculating the dynamic characteristics of discrete systems, i.e. areas of the existence of steady-state motion, areas of stability, capture band, and parameters of transients. By virtue of the developed methods and algorithms, the dynamic modes of several models of discrete phase synchronization systems can be analyzed. They are as follows: Pulsed and digital different orders, dual-ring systems of various types, including combined ones, and systems with cyclic interruption of auto-tuning. The efficiency of various devices for information processing, generation and stabilization could be increased by using the mentioned discrete synchronization systems on the grounds of the results of the analysis. We are now developing original software for analyzing the dynamic characteristics of various classes of discrete phase synchronization systems, based on the developed methods and algorithms.

https://www.mdpi.com/2073-8994/11/2/236/pdf

Dynamics Models of Synchronized Piecewise Linear Discrete Chaotic Systems of High Order

The authors consider an issue of reliable and efficient performance of offshore drilling platforms. It was found that one of the reasons for degrading the factors under review was poor quality of the electric energy generated by a local power-constrained plant when operating for heavy energy converters as well as imperfection of the actuating system controlling quality factors. In order to develop new methods or upgrade known ones and ways of improving quality of performance of the systems under examination, it is required to solve the qualimetry problems. In its turn, this requires solving the problem of identification of the structure of this system and on-line monitoring of changes in its parameters and signals. The modern drilling platform's electric power systems are characterized by the presence in its composition of a great number of the load that has a negative impact on the supplying network of the alternating current, generating into it highest harmonic components of currents and voltages. A great deal of drilling platform's automation systems apply the line currents and voltages to form the reference signal. It is known that filter-compensating devices are the most efficient means to increase the quality of electric energy in the autonomous power supply systems at the moment. Their efficiency in higher harmonic suppression and compensation of their volt-ampere reactive may be provided only with the high accuracy of the calculation of parameters in the target harmonics of the line currents and voltages. And as harmonic composition periodically varies depending on the regime of operation and the composition of load of the electric power station, the settings of filtering devices should be changed constantly, that can be done by means of identification and on-line monitoring processes. The authors have proposed a candidate solution for such a problem through the example of identification and synthesis of the system of measuring system performance indicators required to appraise the electric power quality in this system and, as consequence, performance quality.

http://ieeexplore.ieee.org/iel7/7442935/7448099/07448265.pdf

Identification and tracking problems in qualimetry inspections in distributed control systems of drilling platforms

The article deals with various aspects of using information technologies in dredging. The possibilities of modern information technology in the framework of improving the efficiency of dredging.

/pdf/using-information-technologies-in-dredging-27n74d8byp.pdf

Using Information Technologies In Dredging

Abstract There are a lot of models and algorithms to minimize risks during dredging operations and they are not without drawbacks. The paper describes the authors’ approach to solving this problem. Mathematical models are proposed and on their basis software is developed. Methods of the risk theory are used to minimize the risks. In this paper a consequence of influence refers to the deviation from the goal expressed in the expected results and the deviation of certain criterion factors. In this case, we mean any measure of quality. In its turn, risk factors reduce criterion factors. These factors are divided into categories - general transportation risks and risks of transporting ground. In these categories, one may derive the following risks - incidents at transport resulting from the impact of a set of random factors including the human one. For risk analysis and management, in addition to identifying critical chains of risk situations, the stochastic model for evaluating the chains is set forth. In order to implement this algorithm, the mathematical package Maple is used, which allows for conducting the required calculations with a software package including the Graph Theory. The paper presents fragments of the code listing.

/pdf/models-and-algorithms-for-estimation-and-minimization-of-the-2n3r2pq83n.pdf

D. Mamunts

Papers

Dynamics Models of Synchronized Piecewise Linear Discrete Chaotic Systems of High Order

Identification and tracking problems in qualimetry inspections in distributed control systems of drilling platforms

Using Information Technologies In Dredging

Models and Algorithms for Estimation and Minimization of the Risks Associated with Dredging

Robust Method for Protecting Electronic Document on Waterway Transport with Steganographic Means by Embedding Digital Watermarks into Images