Design of Variable Frequency Speed Control System Base on PLC and Fuzzy Algorithm

2012 ◽  
Vol 562-564 ◽  
pp. 1931-1934
Author(s):  
Ming Jun Yan ◽  
Shao Feng Yan
Keyword(s):  
Frequency Conversion ◽  
Fuzzy Controller ◽  
Frequency Control ◽  
Frequency Converter ◽  
Dynamic Control ◽  
System Stability ◽  
Motor Speed ◽  
Fuzzy Algorithm ◽  
Loop Control ◽  
High Intelligence

Aiming at ac motor closed-loop control difficult, a frequency conversion system was designed base on PLC and fuzzy algorithm. This paper deals with a PLC and frequency converter controle AC induction motor method, as well as constructed two-dimensional fuzzy controller by PLC, realize the dynamic control of nonlinear systems, avoiding the complexity of modeling, improve the system stability and anti-jamming capability. On-site testing shows that this system has a high intelligence and better robustness, can frequency control of motor speed accurately.

The Design and Implementation of Fuzzy Control Algorithm for Frequency Conversion System of Pump

2014 ◽  
Vol 971-973 ◽  
pp. 785-788 ◽  
Author(s):  
Qin Hui Gong
Keyword(s):  
Fuzzy Control ◽  
Control Algorithm ◽  
Frequency Conversion ◽  
Fuzzy Controller ◽  
Frequency Control ◽  
Frequency Converter ◽  
Treatment Frequency ◽  
Single Output ◽  
Conversion System ◽  
Fuzzy Control Algorithm

The principle of double-input and single-output fuzzy controller has been analyzed in detail. Aimed at the frequency conversion system of the pump in wastewater treatment we has conducted the research of fuzzy control algorithm, In frequency control system we adopt double input and single output basic fuzzy controller. The simulation results show that using the fuzzy controller to control frequency converter to realize AC variable speed of motor can achieve value quickly, and control effete is smooth, the dynamic characteristics of system are also good, reaching the design requirements well, which has a very broad application prospects. Keywords: sewage treatment; frequency conversion; fuzzy control; pump; double input and single output

Applied Research on the Closed-Loop Control of Oil Production System with Progressing Cavity Pump

2012 ◽  
Vol 248 ◽  
pp. 119-123
Author(s):  
Duan Yin Zhu ◽  
Jian Ning Xu ◽  
Yan Xiong Gao ◽  
Wen Jie Lv
Keyword(s):  
Production System ◽  
Closed Loop ◽  
Frequency Conversion ◽  
Rotation Speed ◽  
Frequency Converter ◽  
Dynamic Change ◽  
Oil Production ◽  
Closed Loop Control ◽  
Loop Control ◽  
Highly Efficient

It aimed to dynamic change of oilfield productivity, maked sure that the progressing cavity pump is working in a highly efficient region. It combined variable frequency conversion technology and dynamic liquid level height control technology, the closed-loop control of oil production system with progressing cavity pump is made up of rotation-speed and torsion sensor, stepless motor, frequency converter, PLC and progressing cavity pump. The result show that the system can control the pump submergence depth by adjusting the rotation-speed and torsion of polish rod, and make sure the pump working in a highly efficient region finally. This system also can increase recovery efficiency and pump service life.

scholarly journals Speed Control Using Fuzzy Controller for a Four Switch Sensorless BLDC Motor

2020 ◽  
Vol 5 (8) ◽  
pp. 1668-1674
Author(s):  
Niba Shoby ◽  
Deepika Vasanthakumar ◽  
Anupama P K
Keyword(s):  
Fuzzy Logic Controller ◽  
Fuzzy Controller ◽  
High Reliability ◽  
Speed Control ◽  
Bldc Motor ◽  
Motor Speed ◽  
Zero Crossing ◽  
Loop Control ◽  
Speed Regulation ◽  
Loop Control System

- Brushless Direct Current (BLDC) motors are highly efficient motors with high reliability and a longer life span. The advent of sensor less technology has improved the performance and reliability of BLDC motor drives. This work is to analyze a drive system for BLDC motor with Four-Switch Three-Phase Inverter (FSTPI). Back Electromotive Force (EMF) Zero Crossing Detection (ZCD) method is used to estimate the rotor position. Speed control of motor is achieved by using Fuzzy Logic Controller (FLC) based closed loop control system. The Simulation was carried out using MATLAB software and motor the performance was analyzed with FLC for motor speed regulation.

Control of CSR PWM Outer Current Loop Based on Fuzzy Algorithm

2014 ◽  
Vol 672-674 ◽  
pp. 972-976 ◽  
Author(s):  
Zhuo Wang ◽  
Zhang Qing
Keyword(s):  
Fuzzy Controller ◽  
Fuzzy Variable ◽  
Current Control ◽  
Rate Of Change ◽  
Current Loop ◽  
Control Performance ◽  
Control Loop ◽  
Fuzzy Algorithm ◽  
Loop Control ◽  
Control Configuration

This paper expounds the double closed-loop control configuration which is composed by the AC inner current control loop and the DC outer current loop of the CSR PWM rectifier ,and the functions of the inner current loop and the outer current control loop are pointed out. To improve the control performance ,a current controller whose DC outer current loop is designed by the fuzzy algorithm is used. The DC outer current loop error fuzzy variable E’s membership functions is researched ,and also the Rate of change of the current error fuzzy variable EC and the fuzzy variable Δi which is exported by fuzzy controller. Their influences to the control performance are considered. After the simulation experiments, it shows that the DC outer current loop fuzzy control is feasible and effective. The performance of the outer current control loop can be improved.

Frequency Conversion Constant Pressure Water Supply System Controlled by a Fuzzy Controller

2013 ◽  
Vol 694-697 ◽  
pp. 532-537
Author(s):  
Song Liu ◽  
Han Yi Li
Keyword(s):  
Water Supply ◽  
Frequency Conversion ◽  
Constant Pressure ◽  
Fuzzy Controller ◽  
Frequency Converter ◽  
Supply System ◽  
Water Supply System ◽  
Water Yield ◽  
Pressure Water ◽  
Electricity Saving

This thesis introduces a frequency converter constant pressure water supply system which controlled by the fuzzy controller DB-3000A and the frequency converter INVTG9011T4.The double pump can be controlled by a frequency converter efficiently. The frequency conversion constant pressure water supply system is designed by a operation mechanism which has dual-pump with four status. The pressure of water supply has been decided by the water yield of consumers. The pressure value of pressure gauges decides the degree of working load. This system worked well in practical application. This system has advantages like security in operation, flexibility, electricity saving, extended the life of the pump, and so on.

scholarly journals Mathematical Simulation of the Synchronized Asynchronous Electric Drive

2020 ◽  
Vol 178 ◽  
pp. 01021 ◽  
Author(s):  
Victor Meshcheryakov ◽  
Dmitry Sibirtsev ◽  
Ekaterina Mikhailova
Keyword(s):  
Electric Drive ◽  
Control Method ◽  
Frequency Control ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Motor Speed ◽  
Ac Drives ◽  
Asynchronous Electric Drive ◽  
Wide Range ◽  
Rotor Winding

At the end of the last century asynchronous motors with a phase rotor were most widely used among adjustable-speed AC drives. They were used for conveyors, transporters, cranes. That was due to the relative simplicity to adjust the motor speed by acting on the rotor chain. The introduction of a frequency control method in such drives is now complicated by the fact that most frequency converters are designed to be used in drives with a cage asynchronous motor. Shorting of a phase winding leads to highly increased losses during acceleration and motor speed control. If the stator winding of a wound-rotor asynchronous motor is connected to a frequency converter and the rotor winding is connected to a DC link of this converter, the motor will have properties of a synchronous one. The electric drive is able to work in a wide range, while motor characteristics are absolutely rigid. The implementation of such control method is presented in this article. The control system operation has been tested with simulation in the Matlab Simulink software pack. The obtained results are defined as follows.

Study on the "Phase Hopping" AC-AC Frequency Conversion Method with Approximately Continuous Frequencies

2020 ◽  
Vol 13 (8) ◽  
pp. 1217-1226
Author(s):  
Zhengwang Xu ◽  
Guozhuang Jiang ◽  
Ke Kun ◽  
Yuchun Yi
Keyword(s):  
Output Voltage ◽  
Frequency Conversion ◽  
Frequency Control ◽  
Actual Application ◽  
Power Frequency ◽  
Voltage Frequency ◽  
The Law ◽  
Large Cycle ◽  
Selection Of ◽  
Conversion Technology

Background: The output voltage frequency for the previously proposed "phase hopping" AC-AC frequency conversion technology is determined by the law that the number of output voltage cycles is reduced by one relative to the power frequency in a large cycle containing six jumps. According to the law, only a limited number of output frequencies, such as 37.5 Hz, 42.86 Hz and 45 Hz are found. Due to the large spacing between the output frequencies, the "phase hopping" frequency conversion technology is difficult to put into practical use. Methods: In this paper, the law of the output frequency control is generalized so that the number of output cycles in a large cycle is reduced by n relative to the power frequency. The analysis shows that the appropriate selection of large cycles, including the number of power frequency cycles and the value of n, can find more frequencies to be used. Reducing the interval between the output frequencies within 1Hz. Results: The analysis results were verified in simulation by MATLAB, and the harmonics and the feasibility of the actual application were analyzed. Conclusion: Finally, an experimental platform was built and an experimental analysis was carried out. The experimental results show that the theoretical and simulation analyses are correct.

scholarly journals Resonance overvoltage control algorithms in long cable frequency conversion drive based on discrete mathematics

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 408-418
Author(s):  
Yonghong Deng ◽  
Quanzhu Zhang
Keyword(s):  
Mathematical Model ◽  
Control Strategy ◽  
Frequency Conversion ◽  
Balance Control ◽  
Frequency Converter ◽  
Active Power ◽  
Drive System ◽  
Discrete Mathematics ◽  
Power Controller ◽  
Capacitor Voltage

AbstractIn order to solve the problem that the long cable variable voltage and variable frequency (VVVF) system does not adopt an effective capacitor voltage sharing control method, resulting in a poor effect of resonance overvoltage control, the resonance overvoltage control algorithm of the long cable VVVF system based on discrete mathematics is studied. First, the long cable frequency conversion drive system is established. In order to ensure voltage loss in the range of motor requirements, a frequency converter–cable–motor (ICM) system connection mode is used to maintain the system operation. Based on the research of the capacitor voltage balance control strategy of a long cable frequency conversion drive system, the discrete mathematical model of the AC side of the ICM system is established by using this control strategy. The improved constant active power controller is obtained by establishing the mathematical model, and the resonant overvoltage in a long cable frequency conversion drive is realized by using the constant active power controller. The experimental results show that the algorithm can effectively control the resonance overvoltage phenomenon in the long cable frequency control system, and the control accuracy is over 97%. It has good performance and can be applied in practice.

Frequency and inertia response effects, capabilities, and possibilities in renewable energy sources

2021 ◽  
Vol 14 ◽  
Author(s):  
Jishu Mary Gomez ◽  
Prabhakar Karthikeyan Shanmugam
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Frequency Control ◽  
Renewable Energy Sources ◽  
Energy Systems ◽  
Load Shedding ◽  
System Stability ◽  
Frequency Regulation ◽  
Control Schemes ◽  
Inertia Response

Background & Objectives: The global power system is in a state of continuous evolution, incorporating more and more renewable energy systems. The converter-based systems are void of inherent inertia control behavior and are unable to curb minor frequency deviations. The traditional power system, on the other hand, is made up majorly of synchronous generators that have their inertia and governor response for frequency control. For improved inertial and primary frequency response, the existing frequency control methods need to be modified and an additional power reserve is to be maintained mandatorily for this purpose. Energy self-sufficient renewable distributed generator systems can be made possible through optimum active power control techniques. Also, when major global blackouts were analyzed for causes, solutions, and precautions, load shedding techniques were found to be a useful tool to prevent frequency collapse due to power imbalances. The pre-existing load shedding techniques were designed for traditional power systems and were tuned to eliminate low inertia generators as the first step to system stability restoration. To incorporate emerging energy possibilities, the changes in the mixed power system must be addressed and new frequency control capabilities of these systems must be researched. Discussion: In this paper, the power reserve control schemes that enable frequency regulation in the widely incorporated solar photovoltaic and wind turbine generating systems are discussed. Techniques for Under Frequency Load Shedding (UFLS) that can be effectively implemented in renewable energy enabled micro-grid environment for frequency regulation are also briefly discussed. The paper intends to study frequency control schemes and technologies that promote the development of self- sustaining micro-grids. Conclusion: The area of renewable energy research is fast emerging with immense scope for future developments. The comprehensive literature study confirms the possibilities of frequency and inertia response enhancement through optimum energy conservation and control of distributed energy systems.

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