Optimal voltage regulator of power supply system for submersible processing equipment

The article considers the synthesis of the optimal voltage regulator for the electric power supply system of the electromechanical complex of the submersible apparatus with the power transmission through the cable line. Based on the reduced linearized model of the multidimensional nonlinear control object the regulator with adjustable parameters is synthesized, providing the DC voltage stabilization at the power supply system load. The variant of building proportional feedback on output state variables is used for the regulator in the system with parametric and external disturbances. Due to the technical impossibility of measuring the voltage on the load, a combined optimal regulator with negative feedback is organized, which makes it possible to stabilize the voltage at the payload within the specified limits when receiving data from the output filter of voltage source inverter

Mathematical simulation application for research of nonuniform distributed-parameter circuit transients

This paper considers the simulation capability of nonuniform distributed-parameter circuit transients by using MatLab Simulink. This approach is capable of determining currents and voltages of nodes for power networks of any configurations and modes. The paper contains results of nonuniform line simulations in idle, short-circuit and load modes

Effect of Distributed Photovoltaic Generation on the Voltage Magnitude in a Self-Contained Power Supply System

A promising way to increase the technical and economic characteristics of standalone power supply systems is to incorporate renewable energy installations in their structure. This saves fuel and extends the operational life of diesel power stations. The most common option is a hybrid system with photovoltaic power stations incorporated into the local network of the diesel power station. This paper deals with the dependence of the deflection voltage and power losses in the electric power transmission line on the graphs of electrical loads, the parameters of elements of the power supply system, connection points and the capacity of distributed photovoltaic power stations. Research has been carried out on the common low-voltage power supply systems of the radial type (0.4 kV) with an installed capacity of up to 100 kW. The studies have been conducted by simulating the operating modes of hybrid power systems of various configurations. As a result of these studies recommendations to reduce losses and voltage variations in the network by selecting the power and photovoltaic power connection points have been put forward

The power supply system model of the process submersible device with AC power transmission over the cable-rope

A practical problem of power supply system modeling for the process submersible device with AC power transmission over the cable-rope was considered. The problem is highly relevant in developing and operation of submersible centrifugal pumps and submersibles. The results of modeling a symmetrical three-phase power supply system and their compliance with the real data are given at the paper. The obtained results in the mathematical and simulation models were similar

Mathematical model for the power supply system of an autonomous object with an AC power transmission over a cable rope

A modeling problem of the power system, which provides an AC power transmission to a submersible device over the conducting rope, was considered. The power supply system units and their parameters are described. The system multi-dimensional mathematical model in the variables state space with regard to the nonlinear characteristic of system elements is proposed

Operation modes of a hydro-generator as a part of the inverter micro hydropower plant

The paper dwells on the selection problem of power equipment for a stand-alone inverter micro hydropower plant, in particular a hydro-generator, and evaluation of its operation modes. Numerical experiments included the modes calculation of hydroelectric units of the same type with various nominal power, supplied to the consumer according to the unchanged electric load curve. The studies developed requirements for a hydro-turbine and a synchronous generator in terms of a speed range and installed capacity, depending on the load curve. The possibility of using general industrial hydroelectric units with nominal power equal to half-maximum capacity of a typical daily load curve in rural areas was shown

Simulation and optimization of wind and diesel power supply systems

The paper proposes an algorithm to optimize the structure and the choice of capacity of wind and diesel power units of the combined power plant, depending on the wind energy potential and electricity consumption of electrified facility. The algorithm is based on mathematical models of technical and economic characteristics of wind and diesel power plants as well as an optimization method of coordinate descent. The algorithm takes into account the structure of the combined power plant, changing modes of its operation, construction and operation costs of the power facility. The objective function of the algorithm is to minimize the cost of electricity generated

Optimal voltage regulator of power supply system for submersible processing equipment

The article considers the synthesis of the optimal voltage regulator for the electric power supply system of the electromechanical complex of the submersible apparatus with the power transmission through the cable line. Based on the reduced linearized model of the multidimensional nonlinear control object the regulator with adjustable parameters is synthesized, providing the DC voltage stabilization at the power supply system load. The variant of building proportional feedback on output state variables is used for the regulator in the system with parametric and external disturbances. Due to the technical impossibility of measuring the voltage on the load, a combined optimal regulator with negative feedback is organized, which makes it possible to stabilize the voltage at the payload within the specified limits when receiving data from the output filter of voltage source inverter

Power supply system model of remote processing equipment

Nowadays, the relevant and challenging research areas are survey of crustal structure, natural environment of the world ocean, and oil and gas resource potential. To perform such studies, various submersible equipment with remote energy source is often applied. This equipment includes electrotechnical equipment of tethered submersibles and electric motors of submersible centrifugal pumps. Longterm operation of such processing equipment requires continuous electric power supply over a cable-rope. This problem can be solved using specialized power supply systems that provide the necessary voltage conversion of the primary energy source, most often of limited power. The main aim of the research is to solve the problem of approximating a nonlinear mathematical model of the power supply system of processing equipment by a simpler model in the state space. This problem is rather important when designing voltage regulators of the power supply systems for submersible centrifugal pumps of oil-production equipment and tethered submersibles. The methods: state variable method, methods of mathematical modeling. The results. The authors have developed the algorithm for approximating a nonlinear mathematical model of the power supply system of process equipment over a cable-rope. The resulting simplified model was represented in the state space and allows us to use well-proven methods of the linear control theory to synthesize a voltage regulator. Conclusion. The paper describes the simpler model in the state space of the power supply system of processing equipment with an AC power transmission over a cable-rope. A comparative assessment of the simulation results introduced in the paper shows the validity of the model of a reduced order in relation to the initial, more complex mathematical model

Energy efficient algorithm for controlling photovoltaic power plant with electrochemical and thermal energy storage

Актуальность работы определяется возрастающим спросом на энергию, особенно на экологически чистую. В настоящее время большое внимание уделяется исследованию и совершенствованию возобновляемых энергоисточников. Производство электроэнергии с использованием фотоэлектростанций весьма перспективно в районах с высокой инсоляцией, где централизованные энергетические системы недоступны, или в случае, когда доступная электроэнергия обходится дорого. Однако высокая стоимость оборудования фотоэлектростанций ограничивает возможности их широкого применения. Одним из способов снизить стоимость фотоэлектрической установки является аккумулирование электрической энергии не только в электрохимических батареях, но и в виде нагретой воды в менее дорогих водонагревательных установках, что позволит уменьшить стоимость фотоэлектрической установки за счет уменьшения емкости батарей при одновременном обеспечении потребителя горячей водой. Одной из актуальных задач является разработка алгоритмов управления фотоэлектростанций с гибридной электрохимической и электротепловой системой аккумулирования фотоэлектричества. Цель: разработка интеллектуального алгоритма управления энергетическим балансом автономной фотоэлектростанции с электрохимическим и электротермическим аккумулированием фотоэлектричества. Методы: аналитические методы исследования фотоэлектрических станций с агрегатным способом аккумулирования солнечной энергии: в электрохимических и электротермических батареях, методы компьютерного моделирования, метод сравнений с предыдущими научными исследованиями. Результаты. Разработана структура системы управления энергетическим балансом фотоэлектростанции с электрохимическим и электротепловым аккумулированием фотоэлектричества; предложен алгоритм функционирования системы управления с использованием МРРТ технологий; структура и алгоритм функционирования протестированы на примере оптимизации энергетического баланса социального объекта на территории Ирака путём моделирования в программном комплексе Matlab.The relevance of the work is determined by the growing demand for energy, especially for environmentally friendly. Photovoltaic power generation is very promising in areas with high insolation, where centralized power systems are not available or where available electricity is expensive. However, the high cost of photovoltaic power plant equipment limits its wide application. One way to reduce the cost of a photovoltaic installation is to store electrical energy not only in electrochemical batteries, but also in the form of heated water in less expensive water heating installations, which will reduce the cost of a photovoltaic installation by reducing the battery capacity while providing the consumer with hot water. One of the urgent tasks is the development of control algorithms for photovoltaic power plants with a hybrid electrochemical and thermal system for storing electricity. The main aim of the work is to develop the algorithm for controlling the energy balance of an autonomous photovoltaic power plant with electrochemical and thermal energy storage. Methods: analytical methods for studying photovoltaic power plants with an aggregate method of solar energy storage: in electrochemical and thermal batteries, computer simulation methods, method of comparison with previous scientific studies. Results. The authors developed the structure of the control system for energy balance of a photovoltaic power plant with electrochemical and thermal storage of electricity and proposed the algorithm for functioning of the control system using MPPT technologies. The structure and functioning algorithm were tested on the example of optimizing the energy balance of a social facility in Iraq by modeling in the Matlab software package