Inactive capacity compensation device in frequency converters in the composition of electric power systems of marine vehicles

2021 ◽  
pp. 118-123
Author(s):  
Б.Ф. Дмитриев ◽  
С.Я. Галушин ◽  
А.С. Корнев ◽  
К.В. Балицкая
Keyword(s):  
Power Systems ◽  
Power Factor ◽  
Reactive Power ◽  
Autonomous Underwater Vehicles ◽  
Negative Consequences ◽  
Higher Harmonics ◽  
Frequency Converters ◽  
Operating Modes ◽  
Active Filtering

Управление режимами работы гребного электрического двигателя осуществляется полупроводниковыми преобразователями частоты, применение которых значительно ухудшает качество электроэнергии на общих шинах судовых электроэнергетических систем. Основными причинами являются уменьшение коэффициента мощности и появление высших гармоник в потребляемом токе. В результате этого снижается надежность работы потребителей, и увеличиваются потери электроэнергии. Поэтому уменьшение указанных негативных последствий является актуальной задачей. В связи с этим, большое внимание уделяется вопросам, связанным с изучением и разработкой различных методов и устройств обеспечения качества электроэнергии, увеличения коэффициента мощности и фильтрации высших гармоник. В настоящее время, перспективным методов улучшения качества электроэнергии, является применение устройств управления реактивной мощностью и активной фильтрации, т.е. компенсаторов неактивной мощности. Подобные системы можно применять не только для надводных судов, но и в автономных подводных транспортных средствах, в качестве энергетической установки которых выступает батарея топливных элементов. The control of the operating modes of the propulsion electric motor is carried out by semiconductor frequency converters, the use of which significantly degrades the quality of electricity on the common buses of the ship power systems. The main reasons are a decrease in the power factor and the appearance of higher harmonics in the current consumption. As a result, the reliability of the consumers is reduced, and the losses of electricity increase. Therefore, the reduction of these negative consequences is an urgent task. In this regard, much attention is paid to issues related to the study and development of various methods and devices for ensuring the quality of electricity, increasing the power factor and filtering higher harmonics. Currently, a promising method for improving the quality of electricity is the use of reactive power control devices and active filtering, i.e. compensators of inactive power. Such systems can be used not only for surface crafts, but also in autonomous underwater vehicles, the power plant of which is a fuel-cell stack.

scholarly journals Hybrid Reference Current Generation Theory for Solar Fed UPFC System

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1527
Author(s):  
R. Senthil Kumar ◽  
K. Mohana Sundaram ◽  
K. S. Tamilselvan
Keyword(s):  
Neural Network ◽  
Power Factor ◽  
Reactive Power ◽  
Voltage Source ◽  
Unity Power Factor ◽  
Current Generation ◽  
Load Voltage ◽  
Reference Current Generation ◽  
Source Current

The extensive usage of power electronic components creates harmonics in the voltage and current, because of which, the quality of delivered power gets affected. Therefore, it is essential to improve the quality of power, as we reveal in this paper. The problems of load voltage, source current, and power factors are mitigated by utilizing the unified power flow controller (UPFC), in which a combination of series and shunt converters are combined through a DC-link capacitor. To retain the link voltage and to maximize the delivered power, a PV module is introduced with a high gain converter, named the switched clamped diode boost (SCDB) converter, in which the grey wolf optimization (GWO) algorithm is instigated for tracking the maximum power. To retain the link-voltage of the capacitor, the artificial neural network (ANN) is implemented. A proper control of UPFC is highly essential, which is achieved by the reference current generation with the aid of a hybrid algorithm. A genetic algorithm, hybridized with the radial basis function neural network (RBFNN), is utilized for the generation of a switching sequence, and the generated pulse has been given to both the series and shunt converters through the PWM generator. Thus, the source current and load voltage harmonics are mitigated with reactive power compensation, which results in attaining a unity power factor. The projected methodology is simulated by MATLAB and it is perceived that the total harmonic distortion (THD) of 0.84% is attained, with almost a unity power factor, and this is validated with FPGA Spartan 6E hardware.

scholarly journals Stability Operation of Grid Connected Inverter

2019 ◽  
Vol 114 ◽  
pp. 04003
Author(s):  
Armeev Denis ◽  
Chuvashev Roman
Keyword(s):  
Power Systems ◽  
Renewable Energy Sources ◽  
Static Stability ◽  
Energy Sources ◽  
Electrical Grid ◽  
Operating Modes ◽  
Technical Requirements ◽  
Grid Connected Inverter ◽  
Sustainable Power

In the modern electric grid, there is an active penetration of distributed renewable energy sources and energy storage systems, which often require connection by means of electronic converter. Energy sources connected in the grid by means of electronic converter or inverter has large different parameters and operating modes compared to the generation of a traditional one. That leads to a different behavior of such sources in the network. With a large penetration of this kind of generation in the electrical grid, there is a need to revise the principles and methods of design and operation of both inverters and power systems. Otherwise there may be conditions in which it becomes impossible to ensure sustainable power supply and quality of power that satisfy the technical requirements. The goal of the paper is to study the operations of electricity sources connected in the power grid by means of inverter, analyzing the static stability of objects of this kind, as well as studying the possibility of creating algorithms that can successfully adapt such generation objects into a single power system.

Reducing Voltage Fluctuations in Wind Turbines by SVC Method

2016 ◽  
Vol 850 ◽  
pp. 166-171
Author(s):  
Amir Jahi ◽  
S.S. Tezcan
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Wind Turbines ◽  
Reactive Power ◽  
Voltage Characteristic ◽  
Wind Generation ◽  
Static Var Compensator ◽  
Voltage Fluctuations ◽  
Power Regulation

Today because of increasing wind generation in the power systems, voltage variations are critical in power quality of grid combination of wind energy. This paper presents a Static Var Compensator (SVC) as an efficient choice for the reactive power regulation of wind turbines to decrease voltage fluctuations, and the proposed modulation is performed for the cases with and without SVC. The simulation showed the effective influences of the SVC on the voltage characteristic with the unexpected changes in the voltage magnitude.

scholarly journals The influence of changes in the project on the reliability of heat power systems during construction and installation works

2019 ◽  
Vol 124 ◽  
pp. 05083
Author(s):  
T.G. Gorbunova ◽  
T.O. Politova ◽  
Sh.G. Ziganshin ◽  
E.V. Izmailova ◽  
V.V. Serov
Keyword(s):  
Power Systems ◽  
Heat Supply ◽  
Heat Supply System ◽  
Supply System ◽  
Negative Consequences ◽  
Regulatory Requirements ◽  
Heat Networks ◽  
Design Engineers ◽  
The Cost

However, during the construction and reconstruction of existing heat networks, cases that lead to unstable operation of newly laid or replaced areas arise. An important task is to minimize the reasons that can cause damage to replaced areas. Factors that negatively affect the reliability include: laying pipelines without design documentation, non-compliance of the regulatory requirements for their laying by installation organizations. The assumptions of design engineers developing the project and installers laying the heating main can lead to negative consequences, including a decrease in the reliability of the facilities functioning. Physical deterioration, coupled with the above factors, leads to a large number of failures of heat networks. Breakthroughs reduce the reliability of the entire heat supply system, worsen the quality of the supplied coolant and lead to an increase in the cost of maintenance of heat networks by operating organizations. The paper considers the influence of changes in the project during the construction and installation works on the reliability of the heat supply system.

scholarly journals A review on different control techniques using DSTATCOM for distribution system studies

2019 ◽  
Vol 10 (2) ◽  
pp. 813 ◽  
Author(s):  
K. Swetha ◽  
V. Sivachidambaranathan
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Power Factor ◽  
Distribution System ◽  
Reactive Power ◽  
Voltage Sag ◽  
Current Frequency ◽  
Control Techniques ◽  
Detailed Explanation ◽  
Harmonic Elimination

This paper focus on distribution system by applying different control techniques in order to improve the performance of the system. In the distribution system mainly concentrate on power quality issues like reactive power control, harmonic elimination, power factor correction, etc. Because of power quality problems voltage, current, frequency are continuously changing in power systems. These changes will effects the performance of power systems. Power quality problems can be compensated by placing DSTATCOM which is connected at PCC in parallel. It is shunt connected VSI along with the filters, with the help of DSTATCOM voltage sag, swell and THD can be controlled. This paper presents detailed explanation about performance and configuration of latest control techniques to control the DSTATCOM.

A Reactive Power Generator Based on Voltage Source Inverter

2012 ◽  
Vol 260-261 ◽  
pp. 432-437
Author(s):  
Tao Song
Keyword(s):  
Power Systems ◽  
Power Factor ◽  
Reactive Power ◽  
Voltage Source ◽  
Total Power ◽  
Good Effect ◽  
Voltage Source Inverter ◽  
Nonlinear Load ◽  
Power Generator ◽  
Reactive Compensation

With the application of large scale nonlinear load in power systems, lots of harmonic are produced, causing the total power factor to decrease. Therefore, it needs to compensate the reactive power of power systems. The disadvantages of the widely applied static var compensator are that the size of the compensator is too large, and the control ability is poor when the capacity of power systems is small. So a reactive power generator based on voltage source inverter is proposed in this paper. The reactive power generator takes series connection of IGBTs as the main circuit structure, the inverter as core and DSP as controller. The close loop framework consists of human-computer interaction, measurements and feedback control. The inverter is controlled by a digital PI close loop controller to feed a phase adjustable current to power systems to compensate reactive power. The system’s structure is simple, the control is flexible, and the size is small. The test results show that the response of this reactive power generator is quick, and it can compensate the power factor to be 1 which means that it has good effect of static reactive compensation.

scholarly journals Proposed Fuzzy Logic System for Voltage Regulation and Power Factor Improvement in Power Systems with High Infiltration of Distributed Generation

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4241 ◽  
Author(s):  
Ndamulelo Tshivhase ◽  
Ali N. Hasan ◽  
Thokozani Shongwe
Keyword(s):  
Power Generation ◽  
Control System ◽  
Power Systems ◽  
Power System ◽  
Power Factor ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Voltage Regulation ◽  
Active Power ◽  
Distributed Generators

Recently, the awareness of the severe consequences of greenhouse gases on the environment has escalated. This has encouraged the world to reduce the usage of fossil fuels for power generation and increase the use of cleaner sources, such as solar energy and wind energy. However, the conventional power system itself was designed as a passive power system, in which power generation is centralised, and power flows from substations towards the loads. Decentralised renewable energy sources, also called distributed generators, were introduced to create an active power system in which power generation can occur anywhere in the power system. Decentralised power generation creates challenges for the conventional power system, such as voltage fluctuations, high voltage magnitudes, reverse power flow, and low power factor. In this paper, an adaptive control system that coordinates different distributed generators for voltage regulation and power factor correction is introduced and designed. The control system will decrease the total reactive power that flows in the transmission network through a reactive power exchange between distributed generators. Therefore, power factor will improve, power system losses will reduce, and the total apparent power on lines will reduce, giving more room to active power to flow. The results obtained showed that the control system is effective in regulating voltage and improving the power factor when multiple distributed generators are connected.

scholarly journals A Systematic PVQV-Curves Approach for Investigating the Impact of Solar Photovoltaic-Generator in Power System Using PowerWorld Simulator

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2662 ◽  
Author(s):  
Abdullahi Oboh Muhammed ◽  
Muhyaddin Rawa
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Power System ◽  
Power Factor ◽  
Reactive Power ◽  
Power Grid ◽  
Percentage Change ◽  
Droop Control ◽  
Solar Photovoltaic ◽  
The Impact

With the recent growing interest in renewable energy integrated power systems across the globe for the various economic and environmental benefits, it is also significant to consider their influence on voltage stability in power systems. Therefore, this paper reports the static voltage stability impact of solar photovoltaic generation on power networks using PowerWorld simulator power-voltage (P–V)- and voltage-reactive power (V–Q)-curves to investigate the renewable energy generator model performance suitability. The impact of varying power factor control and static voltage droop control of a photovoltaic plant on the maximum generated power, threshold voltage profile and reactive power marginal loading has been examined. Besides, the concept of percentage change in voltage-power sensitivity has been systematically utilized to determine the optimal location for the solar photovoltaic generator on the power grid and the feasible penetrations have been defined for selected system buses. From the simulation results it can be concluded that in a steady-state analysis of the grid integrated power system the effects of power factor (pf) control and voltage droop control should be considered by power grid engineers for effective system operation and, equally, the application of percentage change in voltage-power sensitivity should be extended to real networks to determine the best positions for multiple installations of renewable energy resources.

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