MODEL AND ALGORITHM OF OPERATION OF THE ORIGINAL ELECTROMECHANICAL SYSTEM FOR ACCUMULATING KINETIC ENERGY FOR ELECTRIC CAR

2021 ◽  
Vol 3 (55) ◽  
pp. 41-48
Author(s):  
M. Matkovsky ◽  
◽  
K. Semenov ◽  

Purpose. The further introduction of electric transport is largely constrained by the insufficient energy capacity of existing energy storage devices. One of the possible replacements for the chemical accumulator is the flywheel energy storage, which has important advantages. This advantage is its potentially huge storage capacity. One of the disadvantages of flywheel drives is the presence of a gyroscopic moment, which leads to a deterioration in vehicle handling. Methodology. The authors of the work in their development of the flywheel drive have eliminated a number of shortcomings, but to use the drive, it is necessary to develop an operation algorithm and a mathematical model. A mathematical model of electrical and mechanical processes in the author’s electromechanical energy storage system is presented. It is shown that the charging and discharging currents of a storage device change exponentially with time, which should be taken into account when developing a specific implementation of drivers for storage motors. The algorithm of operation of the proposed electromechanical energy storage system in the modes of energy storage and energy withdrawal has been developed. Results. The verbal and graphical form of the algorithm is presented. It is noted that in the presence of an electromechanical transmission on a vehicle, the advantages of such a drive increase even more, which prompted the authors of this work to develop a new electromechanical transmission, which the authors plan to combine in the future with the developed drive based on one vehicle. Originality. In the direction of further increasing the efficiency of using the proposed storage device, as well as, incidentally, of their other types, it is also planned to use the electromechanical system for transmitting electricity to the vehicle, developed by the authors. Practical value. In the future, it is also planned to expand and clarify the algorithm of the drive, in order to take into account the types of charger, energy source, the presence of batteries on board the car, depending on the characteristics of the vehicle, road conditions, driver qualities, weather conditions, etc. (at the limit, go to an intelligent control system). It is planned to create a more detailed model of the drive. Figures 4, references 21.

2021 ◽  
Vol 69 (2) ◽  
pp. 5-12
Author(s):  
Zheng Li ◽  
Yan Qin ◽  
Xin Cao ◽  
Shaodong Hou ◽  
Hexu Sun

In order to meet the load demand of power system, BP based on genetic algorithm is applied to the typical daily load forecasting in summer. The demand change of summer load is analysed. Simulation results show the accuracy of the algorithm. In terms of power supply, the reserves of fossil energy are drying up. According to the prediction of authoritative organizations, the world's coal can be mined for 216 years. As a renewable energy, wind power has no carbon emissions compared with traditional fossil energy. At present, it is generally believed that wind energy and solar energy are green power in the full sense, and they are inexhaustible clean power. The model of wind power solar hydrogen hybrid energy system is established. The control strategy of battery power compensation for delayed power of hydrogen production is adopted, and different operation modes are divided. The simulation results show that the system considering the control strategy can well meet the load demand. Battery energy storage system is difficult to respond to short-term peak power fluctuations. Super capacitor is used to suppress it. This paper studies the battery supercapacitor complementary energy storage system and its control strategy. When the line impedance of each generation unit in power grid is not equal, its output reactive power will be affected by the line impedance and distributed unevenly. A droop coefficient selection method of reactive power sharing is proposed. Energy storage device is needed to balance power and maintain DC voltage stability in the DC side of microgrid. Therefore, a new droop control strategy is proposed. By detecting the DC voltage, dynamically translating the droop characteristic curve, adjusting the output power, maintaining the DC voltage in a reasonable range, reducing the capacity of the DC side energy storage device. Photovoltaic grid connected inverter chooses the new droop control strategy.


2018 ◽  
Vol 180 ◽  
pp. 02005 ◽  
Author(s):  
Włodzimierz Jefimowski ◽  
Anatolii Nikitenko

The paper presents the results of economic study of energy storage system (ESS) implemented in 3 kV DC power supply system. Two conceptions of ESS have been investigated: ESS with supercapacitor (SC) and hybrid ESS (HESS) with SC and LFP battery. The investigated locations of energy storage systems are considered among existing traction substations in two railway lines with different density of train operation. The considered aims of energy storage system implementation are decreasing of energy consumption by maximum regenerative energy utilization and reduction of peak 15- min power demand of traction substation. The paper presents a method of regenerative power estimation depending on the location of the considered ESS implementation point. Also the method of optimal location selection of ESS in terms of minimization of Simple Payback Time (SPBT) of investment is presented. Besides the influence of initial cost value as well as energy price on the SPBT value are investigated. The results are compared between two railway lines with different number of trains operating.


2022 ◽  
Author(s):  
Fengfeng Han ◽  
Qi Jin ◽  
Junpeng Xiao ◽  
Lili Wu ◽  
Xitian Zhang

Lithium–sulfur batteries (LBSs) have potential to become the future energy storage system, yet they are plagued by the sluggish redox kinetics. Therefore, enhancing the redox kinetics of polysulfide is a...


2020 ◽  
Vol 10 (14) ◽  
pp. 1903930 ◽  
Author(s):  
Qiang Zeng ◽  
Yanqing Lai ◽  
Liangxing Jiang ◽  
Fangyang Liu ◽  
Xiaojing Hao ◽  
...  

The Nanogrid utilizes renewable energy sources, e.g. Solar PV, Wind, etc; which are stochastic in nature. Due to this nature, power reliability is the main issue. To increase the reliability of the power supply and proper utilization of the available resources, Nanogrid should either connected to the utility grid directly or it must have the proper energy storage system. Energy storage system fills the gap between consumers demand and renewable power generation; which is very important issue in technical and economical consideration. The Nanogrid gives new hope of ray to the people living in off grid areas. By using energy storage system we can increase their living standard and enhance socio-economical development. This paper proposes the selection of the proper energy storage device and its calculation, control strategy also suggested for protecting storage device from over voltage and deep discharge.


2019 ◽  
Author(s):  
Chen Liu ◽  
Shengdun Zhao ◽  
Peng Dong ◽  
Peng Zhang

Abstract Servo press is a manufacturing machine that usually works under impact loads. Flywheel battery is an energy storage device that has been widely studied in recent years. In this paper, a flywheel battery system for servo press energy compensation was put forward. In considering the efficiency and structure robustness, the flux switching permanent magnet (FSPM) motor is appropriate for flywheel battery as energy conversion device. In this study, the flywheel battery structure and working principle were first described. Then the motor characters were analyzed by FEM. After that, a simply initiative power control strategy was introduced for the flywheel battery. Finally, the prototype of flywheel battery with FSPM motor was made and connected to a servo press’s motor driver. The experiments were taken with and without the flywheel battery respectively. The experiment results proved that the flywheel battery could compensate a certain of DC link voltage loss during the press stamping process. That makes the servo press’s driven motor has a more stable power source and reduces the electrical shock to other equipment. In conclusion, the flywheel battery with FSPM motor is an effective energy storage system for servo press. It is believed that with the miniaturization and simplification of flywheel battery, the flywheel battery will be more general in impact load devices.


SIMULATION ◽  
1969 ◽  
Vol 13 (3) ◽  
pp. 155-164 ◽  
Author(s):  
Billy H. Easter

To harness the energy contained in such unconventional sources as winds, tides, and sunlight, a power system must incorporate an energy storage device to act as a buffer between the source and the load. Since the size of the energy storage device depends upon the relative timing of the availability of energy and the load demand, a system simulation is a logical approach to the study and design of power systems using these unconventional en ergy sources. GPSS is presented as an excellent simula tion vehicle. The physical properties to be simulated are discussed and the resulting GPSS programs are presented. Some proposed applications for these power systems are presented.


2014 ◽  
Vol 629 ◽  
pp. 310-317 ◽  
Author(s):  
Samira Eshghi ◽  
Renuganth Varatharajoo

Combined Energy and Attitude Control System (CEACS) is an optimization approach that combines the energy storage system and the attitude control system. With a double counter rotating flywheel simultaneously serving as energy storage device and as attitude control actuator, CEACS requires an accurate control strategy to obtain the mission requirements. In addition, it is important to design the control law to be invariant to uncertainties and disturbances, and guarantee robustness as CEACS inherits these in-orbit uncertainties. This paper presents a nonlinear control employing sliding mode to enhance the CEACS attitude control capability. The mathematical model for the conventional and boundary layer sliding mode controls are developed herein for CEACS. The controller provides enhancement in pointing accuracies, reasonable transient responses and a robustness against uncertainties and in-orbit disturbances.


Author(s):  
Varvara Guzhavina ◽  
Gleb Nesterenko ◽  
Gleb Prankevich ◽  
Dmitriy Gladkov ◽  
Vyacheslav Zyryanov ◽  
...  

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