Grid-tied photovoltaic system with a storage battery to supply the local object own needs with multi-zone payment

2020 ◽  
Vol 23 (2) ◽  
pp. 6-15
Author(s):  
О. SHAVELKIN ◽  
◽  
І. SHVEDCHYKOVA ◽  
Keyword(s):  
Control System ◽  
Input Voltage ◽  
Photovoltaic System ◽  
Storage Battery ◽  
Active Rectifier ◽  
Autonomous Operation ◽  
Autonomous Mode ◽  
Storage Batteries ◽  
Energy Processes

The principles for the implementation of control and redistribution of energy in a photovoltaic system with a storage battery for a local object connected to a grid with multi-zone tariffication have been improved, with the exclusion of generating electricity to the grid. There is a synthesis of the structure of the control system and the control algorithm based on the analysis of processes in electrical circuits using computer modeling to substantiate the system parameters and check the proposed solutions. The possibility of ensuring the normal functioning of a local object for a possible violation of the quality of electricity during the most loaded peak hours and most of the daytime during the autonomous operation of the system is shown. Relationships are obtained for determining the values of the input voltage of the inverter, the inductance of the reactor and the PWM frequency when the inverter is operating in the active rectifier mode with the possibility of reducing the PWM frequency in the autonomous mode with a decrease in energy losses in the switches and an increase in efficiency. The structure of the control system has been improved to ensure that the battery operates in the active zone of charging characteristics in an autonomous mode and switching the load to the grid when the inverter charges the battery in the active rectifier mode. The simulation model of energy processes in the system has been improved, taking into account the charging and discharging characteristics of the battery. It has been established that the lowest costs for electricity consumed from the network are achieved at maximum loads during peak hours, the ratio of the capacities of photoelectric and storage batteries is justified. The performance of the proposed solutions is confirmed by modeling in Matlab and on an experimental setup based on a standard hybrid inverter. The solutions obtained are the basis for the design of new and modernization of existing photoelectric systems of local objects, including the use of software and hardware control systems.

scholarly journals Simulation of a hybrid photovoltaic system with a storage battery for a local object in the case of energy management using forecast.

2021 ◽  
Vol 24 (1) ◽  
pp. 6-13
Author(s):  
ШАВЬОЛКІН О.О. ◽  
◽  
ПІДГАЙНИЙ М.О. ◽  
СТАНОВСЬКИЙ Є.Ю. ◽  
◽  
...  
Keyword(s):  
Energy Management ◽  
Weather Conditions ◽  
Photovoltaic System ◽  
Storage Battery ◽  
Battery Charge ◽  
Sufficient Energy ◽  
Reducing Costs ◽  
Storage Batteries ◽  
The Cost ◽  
Energy Processes

The issues of increasing the efficiency of a hybrid photovoltaic system with a storage battery for a local object by improving energy management by forecasting with simulation of energy processes in the system are considered. It is proposed to combine the functions of ensuring the auxiliary needs of the object with the planned generation of energy to the grid for the day ahead during peak hours. In the absence of generation to the grid in the case of sufficient energy from the photovoltaic and storage batteries, the system operates in an autonomous mode. To reduce energy consumption from the network, it is proposed to switch to work with the grid with predicting the degree of battery charge and correcting the load power when the voltage decreases within acceptable limits. To study the efficiency of energy management according to the forecast, simulation modeling of energy processes in the daily cycle was used. The developed model with a block for predicting the degree of battery charge allows you to investigate the operation of the system under various weather conditions with an estimate of the cost of paying for electricity from the grid at multi- zone billing. In this case, the archived data of the forecast of the generation of a photovoltaic battery from open web resources were used. The simulation results confirm the efficiency of the proposed solutions and the possibility of reducing costs even in the absence of generation to the grid. The solutions obtained are the basis for the design of software control complexes for photovoltaic systems with batteries with improved energy efficiency.

On-Board Power Supply System for Electric Aircraft

Vestnik MEI ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 43-50
Author(s):  
Sergey I. Volskiy ◽  
◽  
Nikolay V. Kuznetsov ◽  
Marat V. Yuldashev ◽  
Dmitriy A. Sorokin ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Power Supply ◽  
Electric Propulsion ◽  
Power Supply System ◽  
Supply System ◽  
Storage Battery ◽  
Electric Motors ◽  
Active Rectifier ◽  
Electric Aircraft ◽  
Storage Batteries

The development of electric aircraft, the design of which will use, apart from doing away with pneumatic and hydraulic transmissions, electric propulsion, is one of promising lines in aviation technology. As an example, the project of the X-57 Maxwell electric aircraft developed by NASA, which is equipped with 14 propulsion electric motors, is given. In view of insufficient energy efficiency of existing storage batteries, a combined storage battery-and-generator power supply system for electric aircraft is considered. In the considered system, the aircraft propulsion is provided by electric motors, which are powered by storage batteries in combination with permanent magnet generators. The generator shaft is rotated by an auxiliary internal combustion engine, which operates in an economical mode. The power circuit of an active rectifier producing the +270 V DC bipolar output voltage is proposed, with which the permanent magnet generator operates with a sinusoidal phase current waveform and a close-to-unity power factor. The active rectifier control system uses an enhanced phase-locked loop, which eliminates the need to use generator rotor position sensors. For determining the stability domains and revealing undesirable hidden attractors in the considered storage battery-and-generator power supply system, it is proposed to use special analytical-numerical computation procedures based on modifications of Lyapunov's functions methods. The article will be of interest for developers of both aircraft and ground-based self-contained electric power supply systems with a bipolar 270 V DC voltage that must meet stringent requirements for improvement of their mass-and-dimensions and power performance characteristics.

scholarly journals THE INFLUENCE OF THE INPUT INDUCTANCE ON THE QUALITATIVE INDICATORS OF ACTIVE CONTROLLED RECTIFIER

2021 ◽  
pp. 18-23
Author(s):  
Denis Krylov ◽  
Olga Kholod
Keyword(s):  
Control System ◽  
Electromagnetic Compatibility ◽  
Modulation Frequency ◽  
Frequency Converter ◽  
Voltage Source ◽  
Stable Operation ◽  
Active Rectifier ◽  
Semiconductor Converters ◽  
Three Phase

The main part of electricity is used by industrial plants in a converted form and the use of semiconductor converters is growing rapidly. The requirements for the quality of semiconductor converters are increased. And their impact on the power supply, load and related consumers is increased too. One of the most popular converters in the segment of low and medium power drives is a frequency converter made on the basis of a three-phase stand-alone voltage inverter. A significant disadvantage of such converters is the use of a diode rectifier at the input of the circuit, which has disadvantages as the inability to recover electricity to the mains in the mode of dynamic braking of an induction motor and significant distortions of the mains current. These disadvantages can be eliminated by using an active rectifier instead of a diode rectifier, which provides a sinusoidal shape of the mains current in phase with the mains voltage and the possibility of bidirectional energy exchange with the load. The efficiency of the active rectifier-voltage source is determined by the selected control algorithm of the circuit switches and the correct task of the inductance of the input choke. A mathematical model of a three-phase active rectifier-voltage source, working with a fixed modulation frequency with a vector algorithm for building a control system and analysis of the influence of the input inductance on the quality of its work was created. From the simulation results it became obvious that the proposed structure of the control system provides stable operation of the converter and acceptable standards for electromagnetic compatibility with the mains at a fixed modulation frequency; the proposed algorithm for calculating the value of the input inductances allows you to correctly select their allowable value, and obtained in the simulation of the dependence allows you to most accurately determine the value of the input inductances on the allowable level of distortion of mains current and supply voltage.

scholarly journals Improving of the vector control system structure of the active controlled rectifier

2021 ◽  
pp. 43-48
Author(s):  
Denis Krylov ◽  
Olga Kholod
Keyword(s):  
Control System ◽  
Vector Control ◽  
Power Supply ◽  
Frequency Converter ◽  
System Structure ◽  
Voltage Source ◽  
Active Rectifier ◽  
Semiconductor Converters ◽  
Vector Control System

The vast majority of electricity is used by industrial facilities in a converted form. At the same time, the use of semiconductor converters to obtain the required load parameters is intensively increasing. Current trends in the development and improvement of semiconductor converters are aimed at energy saving by improving their quality of work and reducing the impact on the power supply, load, and related consumers. Frequency converter with DC insert has become widespread and widely used. Its scheme is mainly based on an uncontrolled diode rectifier and an autonomous voltage inverter. Uncontrolled rectifiers are simple and reliable, but have two main disadvantages: the impossibility to recover electricity to the supply network and distortions of the source current shape. We can get rid of these disadvantages by using an active rectifier made according to the voltage source scheme instead of an uncontrolled rectifier. The operation of an active rectifier significantly depends on the type of its control system structure. This article aims to to improve the structure of the switches control system of the active rectifier scheme – voltage source built using a vector calculation algorithm; creation of a MatLab model of a three-phase active-controlled rectifier operating with a fixed modulation frequency and analysis of the influence of the input inductance value on the quality of its operation. The simulation results confirm that the improved structure of the vector control system proposed by the authors ensures high-quality operation of the active rectifier and electromagnetic compatibility of the frequency converter with the power supply network at the level allowed by the standards; simplification of the representation mathematical apparatus of the generalized vectors of currents and voltages at the construction of a vector control system of the active rectifier – voltage source practically did not influence qualitative indicators of the converter work in any way; a network filter must be used to eliminate the final distortions introduced into the source voltage by an additional nonlinear load.

scholarly journals Management of power consumption in a photovoltaic system with a storage battery connected to the network with multi-zone electricity pricing to supply the local facility own needs

2021 ◽  
pp. 36-42
Author(s):  
A. A. Shavelkin ◽  
J. Gerlici ◽  
I. O. Shvedchykova ◽  
K. Kravchenko ◽  
H. V. Kruhliak
Keyword(s):  
Power Consumption ◽  
Simulation Model ◽  
Photovoltaic System ◽  
Storage Battery ◽  
Electricity Pricing ◽  
Modeling And Analysis ◽  
Local Facility ◽  
Load Schedule ◽  
Battery Energy ◽  
Energy Processes

Purpose. Improving the principles of management of photovoltaic system with storage battery and with autonomous functioning during daylight hours for a local object, connected to the grid with multi-zone payment when excluding the generation of energy into the grid. Methodology. Modeling and analysis of energy processes in the photovoltaic system was performed using the Matlab software package. The simulation model of energy processes is based on calculated expressions taking into account the characteristics of the battery. Operability of the proposed solutions are confirmed on an experimental setup based on a standard hybrid inverter. Results. It’s shown, that due to the battery energy during the most loaded peak hours and part of the daytime the system operates autonomously and does not depend on possible violations of the quality of electricity in the grid. Scenarios of the recommended load schedule are proposed in accordance with the ratio of the predicted value of the daily energy generation of the photovoltaic battery to its possible maximum value. A simulation model of energy processes in the system with the correction of the recommended load value was developed. Originality. A method of the recommended load calculation with current correction for the actual generation and degree of battery charge is proposed, which allows taking into account differences the actual generation of the photovoltaic battery from its predicted value and the actual load from the recommended one. Practical value. The obtained solutions are the basis for the design of new and modernization of existing photovoltaic systems of local objects using software and hardware complexes for power consumption management.

scholarly journals Recovery Current Sinusoidality Distortion in the Control System of Forced Discharge of Batteries into the Mains

2020 ◽  
Vol 26 (4) ◽  
pp. 540-554
Author(s):  
S. S. Frolov ◽  
◽  
D. A. Shatilov ◽  
Keyword(s):  
Control System ◽  
Electromotive Force ◽  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Universal System ◽  
Current Function ◽  
Active Rectifier ◽  
Storage Batteries ◽  
The Relationship

The requirements for the reverse recovery current sinusoidality are high. Therefore, when developing programs for microcontrollers for a universal system of pulse-width modulation of the recovery current, it is important to have information on the dependences of the sinusoidality distortion degree on the relationship between the total electromotive force of the battery and the mains voltage, the amplitude of the recovery current, the inductance of the active rectifier coil, through which it flows, as well as between the frequencies of the network and the control PWM signal. The results of research into the development of a microcontroller modulation system for a routine forced (training or diagnostic) discharge of storage batteries into a single-phase network are presented. The sought expressions for the dependences of the sinusoidality distortion degree are obtained on the basis of the results of the spectral transformation of the regenerative current function obtained in MathCAD when the latter is formed by the control signal with single-stroke double-sided PWM-2.

Pengaruh Kualitas Sumber Daya Manusia, Pemanfaatan Teknologi Informasi, Dan Sistem Pengendalian Intern Terhadap Ketepatwaktuan Pelaporan Keuangan Pemerintah Desa

2018 ◽  
Vol 26 (2) ◽  
pp. 131-143
Author(s):  
Marlinawati Marlinawati ◽  
Dewi Kusuma Wardani
Keyword(s):  
Information Technology ◽  
Control System ◽  
Human Resources ◽  
Financial Reporting ◽  
Internal Control ◽  
Positive Influence ◽  
Internal Control System ◽  
Speed Up ◽  
Village Government

The purpose of this research is to know the influence between the Quality of Human Resources, Utilization of Information Technology and Internal Control System Against Timeliness of Village Government Financial Reporting at Gunungkidul Regency. This research is causative research. The population is the village government in Gunungkidul Regency, especially in Gedangsari subdistrict. Criteria of respondents in the study were to village and village apparatus. We use questionnaire to collect data. We use multiple regression with SPSS program version 16.0 to analyze data. We find that quality of human resources and internal control system have a positive influence on the timeliness of village government financial reporting. On the other hand, utilization of information technology does not influence the timeliness of village government financial reporting. These imply that the quality of human resources and internal control system can speed up the preparation of village government financial reporting.

DESIGN, SIMULATION AND IMPLEMENTATION MONITORING SYSTEM FOR SYSTEM CONTROL C4 FEEDING PUMP FOR FEED VAPORIZATION IN THE BUTADIENE PLANT

2020 ◽  
Vol 1 (1) ◽  
pp. 31-35
Author(s):  
Fahmi Yunistyawan ◽  
Yunistyawan J Berchmans ◽  
Gembong Baskoro
Keyword(s):  
Motor Control ◽  
Control System ◽  
Field Operator ◽  
System Control ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Software And Hardware ◽  
Discharge Pressure ◽  
Selection Of

This study implements the auto start control system on an electric motor 3 phase C4Feeding pump when the discharge pressure is low-low (4.3 kg /cm²). The C4 feeding pumpmotor was initially manually operated from the local control station, this was very ineffectiveand inefficient because it still relied on the field operator to operate the pump motor and whenthe plant was in normal operating it is very risk if the field operator late to operate motor then itwill impact to quality of the product, and if the delay time to operate motor is too long then planthave to shut down, therefore improvement is needed in the C4 feeding pump motor controlsystem. In this paper, various types of 3-phase motor control are explained which allow it to beapplied to the C4 feeding pump motor that are on-off, inverter, and variable speed drive andefficient selection of the three systems control of the motor. Software and hardware used in thisthesis work are DCS CENTUM VP Yokogawa.

scholarly journals Results of Laboratory Studies of the Automated Sorting System for Root and Onion Crops

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1257
Author(s):  
Alexey Dorokhov ◽  
Alexander Aksenov ◽  
Alexey Sibirev ◽  
Nikolay Sazonov ◽  
Maxim Mosyakov ◽  
...  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Technological Parameters ◽  
Post Harvest ◽  
Manual Sorting ◽  
Sorting System ◽  
Working Bodies ◽  
Automatic Removal

The roller and sieve machines most commonly used in Russia for the post-harvest processing of root and tuber crops and onions have a number of disadvantages, the main one being a decrease in the quality of sorting due to the contamination of working bodies, which increases the quantity of losses during sorting and storage. To obtain high-quality competitive production, it is necessary to combine a number of technological operations during the sorting process, such as dividing the material into classes and fractions by quality and size, as well as identifying and removing damaged products. In order to improve the quality of sorting of root tubers and onions by size, it is necessary to ensure the development of an automatic control system for operating and technological parameters, the use of which will eliminate manual sorting on bulkhead tables in post-harvest processing. To fulfill these conditions, the developed automatic control system must have the ability to identify the material on the sorting surface, taking into account external damage and ensuring the automatic removal of impurities. In this study, the highest sorting accuracy of tubers (of more than 91%) was achieved with a forward speed of 1.2 m/s for the conveyor of the sorting table, with damage to 2.2% of the tubers, which meets the agrotechnical requirements for post-harvest processing. This feature distinguishes the developed device from similar ones.

Research of H∞ Robust Control for the Giant Die Forging Hydraulic Press’s Synchronous Control System under the Uncertainty Coefficient

2012 ◽  
Vol 190-191 ◽  
pp. 819-824 ◽  
Author(s):  
Ying Jian Deng ◽  
Zhong Wei Liu
Keyword(s):  
Control System ◽  
Robust Control ◽  
Control Algorithm ◽  
Hydraulic Press ◽  
National Defense ◽  
Synchronous Control ◽  
Performance Quality ◽  
System Synchronization ◽  
Uncertainty Coefficient

The giant hydraulic die press is our country national defense and the infrastructure essential equipment, the synchronous control system is the essential device to the giant forging hydraulic press, its synchronization control performance quality is good or bad will directly determine the quality of the product. This article through the proof of the theorem, gives the specific steps to achieve H∞ robust control algorithm. The simulation results show that: this control strategy has good inhibition to the change of system parameters, robustness is very strong, can well eliminate the system synchronization error.

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