scholarly journals Redesain Speed Control Submerged Scraper Conveyor (Ssc) Bottom Ash Menggunakan Ac Drive

2020 ◽  
Vol 2 (1) ◽  
pp. 39-53
Author(s):  
Fahrizal Reza ◽  
Ilmi Rizki Imaduddin
Keyword(s):  
Fly Ash ◽  
Local Control ◽  
Bottom Ash ◽  
Speed Control ◽  
Spare Part ◽  
Motor Drive ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Ac Drive ◽  
Machine Interface

Sistem kontrol penggerak Submerged Scrapper Conveyor (SSC) mempunyai peran yang sangat vital dalam proses kerja transportasi material limbah abu berat (bottom-ash) yang merupakan sisa hasil pembakaran batubara di boiler. Sistem kontrol penggerak SSC bekerja secara kontinyu 24 jam untuk menjaga agar material bottom ash tidak menumpuk di boiler hopper . Sistem ini harus selalu dijaga kehandalannya, karena apabila bermasalah maka akan berdampak langsung pada keberlangsungan operasi boiler di pembangkit yaitu menyebabkan derating.Sistem kontrol penggerak eksisting pada SSC menggunakan speed variator. Speed variator bekerja secara mekanis untuk mengatur kecepatan dari SSC yaitu dengan sistem hidrolik transmisi. Kecepatan perlu diatur untuk mengendalikan laju material bottom ash akibat variasi beban pembangkit. Apabila beban tinggi, maka material bottom ash akan lebih banyak dibanding pada beban rendah. Sistem penggerak SSC di PLTU Paiton Unit 1 dan 2 dengan speed variator dewasa ini banyak mengalami permasalahan. Mulai dari overheating, kerusakan inner part, hingga spare part yang sudah tidak tersedia (obsolete), selain itu penurunan nilai kalori batubara yang dipakai pada boiler juga menambah beban pada SSC dikarenakan limbah bottom ash yang semakin banyak.Untuk memaksimalkan kehandalan SSC di PLTU Paiton, maka dilakukan redesain speed control SSC. Redesain ini dilakukan dengan mengganti sistem kontrol penggerak SSC yang lama, yaitu speed variator dengan VFD (variable frequency drive) atau motor drive AC (Alternating Current). Redesain tersebut terdiri dari beberapa tahap, antara lain: (i) melakukan  penggantian peralatan pada sistem kontrol penggerak SSC antara lain motor SSC serta mengganti speed variator dengan VFD, (ii) memodifikasi wiring  dan logic  pada PLC sistem untuk mengontrol kecepatan SSC, (iii) melakukan modifikasi panel kontrol sehingga operasi SSC dapat dimonitor di CCR Fly Ash HMI Human Machine Interface dan local control station baik secara auto atau lokal.

Automatic Speed Control of a Three Phase Induction Motor by Variable Frequency Drive

2021 ◽  
pp. 277-286
Author(s):  
Sayantan Chanda ◽  
Chayan Bandopadhyay ◽  
Maitreyee Banerjee ◽  
Shalini Mondol ◽  
Ankur Bhattacharjee
Keyword(s):  
Induction Motor ◽  
Speed Control ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Three Phase

Hybrid-Electric Turbocharger and High-Speed SiC Variable-Frequency Drive Using Sensorless Control Algorithm

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Andrew L. Carpenter ◽  
Troy L. Beechner ◽  
Brian E. Tews ◽  
Paul E. Yelvington
Keyword(s):  
High Temperature ◽  
Control Algorithm ◽  
Sensorless Control ◽  
Speed Control ◽  
Test Stand ◽  
Switching Frequency ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
High Switching Frequency ◽  
Hybrid Electric

Electrically assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events (and store it in a vehicle's onboard batteries). This can lead to better overall vehicle performance, emissions, and efficiency while allowing for further engine downsizing and increased power density. In this research effort, a hybrid-electric turbocharger, variable-frequency drive (VFD), and novel sensorless control algorithm were developed. An 11 kW permanent-magnet (PM) machine was coupled to a commercial turbocharger via an in-line, bolt-on housing attached to the compressor inlet. A high-efficiency, high-temperature VFD, consisting of custom control and power electronics, was also developed. The VFD uses SiC MOSFETS to achieve high-switching frequency and can be cooled using an existing engine coolant loop operating at up to 105 °C at an efficiency greater than 98%. A digital sliding mode-observer sensorless speed control algorithm was created to command and regulate speed and achieved ramp rates of over 68,000 rpm/s. A two-machine benchtop motor/generator test stand was constructed for initial testing and tuning of the VFD and sensorless control algorithm. A gas blow-down test stand was constructed to test the mechanical operation of the hybrid-electric turbocharger and speed control using the VFD. In addition, a liquid-pump cart was assembled for high-temperature testing of the VFD. Initial on-engine testing is planned for later this year. This paper intends to present a design overview of the in-line, hybrid-electric device, VFD, and performance characterization of the electronics and sensorless control algorithm.

Controlling Flow Rate and Fluid Level by Variable Frequency Drive Unit

2010 ◽  
Vol 57 (4) ◽  
pp. 393-404
Author(s):  
Riza Gürbüz
Keyword(s):  
Flow Control ◽  
Flow Rate ◽  
Control Unit ◽  
Control Flow ◽  
Variable Frequency ◽  
Motor Speed ◽  
Fluid Level ◽  
Drive Unit ◽  
Variable Frequency Drive ◽  
Ac Drive

Controlling Flow Rate and Fluid Level by Variable Frequency Drive Unit The Variable Frequency Drive (VFD) is used to control the speed of the pumpmotor to attain the desired flow rate and fluid level in a fluid system. An AC drive provides efficient flow control by varying the pump-motor speed. The comparison of energy requirements and costs in a system where a throttling device is used for flow control on a centrifugal pump with the power used when an variable frequency drive (VFD) is used to control the same flow, evidently shows potential savings. In this system, AC Motor Frequency drive and static pressure transmitter, turbine type flowmeter and Analog/Digital cards, micro-control unit and computer connection are designed specially to control flow rate, fluid flow type (turbulence or laminar) and water level at the different conditions with different PID parameters.

Research on Multi-Speed Control of Variable-Frequency Drive

2014 ◽  
Vol 538 ◽  
pp. 425-428
Author(s):  
Xiao Na Song
Keyword(s):  
Previous Experiment ◽  
Speed Control ◽  
Variable Frequency ◽  
Variable Speed ◽  
Variable Frequency Drive ◽  
Experimental Teaching ◽  
Three Phase ◽  
Speed Mode ◽  
Plc Program

This paper introduces a noval experimental teaching project. Different from previous experiment, in this project, three-phase motor can operate at multi-speed mode or continuously variable speed mode controlled by PLC and VFD. The obvious characteristic of the experiment is that the VFD is controlled by PLC automatically. The configuration of the experiment including hardware and software is introduced in detail. The results of the execuation of the PLC program reveals that three-phase motor can operate in two modes according to the instructions from PLC. In addition, the speed can be changed with the corresponding parameters seting. Therefore, the knowledge of PLC and VFD are combined in one teaching project, through which student can master more practical technique. The work of this paper is significant for improving the students’ comprehensive capability.

Design ADRC for Cutter Suction Dredger Cutter Motor Variable Frequency Drive System

2014 ◽  
Vol 1008-1009 ◽  
pp. 650-653 ◽  
Author(s):  
Ming Bai ◽  
Jin Hua Chen ◽  
Cheng Ning Xie ◽  
Fang Hui Li
Keyword(s):  
Virtual Instrument ◽  
Design Method ◽  
Harmonic Distortion ◽  
Speed Control ◽  
Mathematic Model ◽  
Drive System ◽  
Variable Frequency ◽  
Fundamental Wave ◽  
Variable Frequency Drive ◽  
Labview Platform

In order to achieve precise speed control for cutter suction dredger cutter motor, the controller should adapt well to uncertainties, such as geological environment, water flow, mechanical disturbance, etc. It makes the design of cutter motor controller always a hard work. This paper proposes an active disturbance rejection controller (ADRC) approach for cutter suction dredger cutter motor variable frequency drive system. Firstly, the LabVIEW platform was established by virtual instrument technology, which collected operating data of cutter motor in fundamental wave and total harmonic distortion (THD). Then cutter motor motion mathematic model was built and the ADRC design method was introduced. Lastly, the simulation results in the cutter velocity control and disturbance environments were done. The results show that the ADRC controller has strong robustness, and the precise speed control can be implemented.

Hybrid-Electric Turbocharger and High-Speed SiC Variable-Frequency Drive Using Sensorless Control Algorithm

2017 ◽  
Author(s):  
Andrew L. Carpenter ◽  
Troy L. Beechner ◽  
Brian E. Tews ◽  
Paul E. Yelvington
Keyword(s):  
High Temperature ◽  
Control Algorithm ◽  
Sensorless Control ◽  
Speed Control ◽  
Test Stand ◽  
Switching Frequency ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
High Switching Frequency ◽  
Hybrid Electric

Electrically-assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events (and store it in a vehicle’s onboard batteries). This can lead to better overall vehicle performance, emissions, and efficiency while allowing for further engine downsizing and increased power density. In this research effort, a hybrid-electric turbocharger, variable-frequency drive (VFD), and novel sensorless control algorithm were developed. An 11kW permanent-magnet machine was coupled to a commercial turbocharger via an in-line, bolt-on housing attached to the compressor inlet. A high-efficiency, high-temperature variable-frequency drive, consisting of custom control and power electronics, was also developed. The variable-frequency drive uses SiC MOSFETS to achieve high-switching frequency and can be cooled using an existing engine coolant loop operating at up to 105 °C at an efficiency greater than 98%. A digital sliding mode-observer (DSMO) sensorless speed control algorithm was created to command and regulate speed and achieved ramp rates of over 68,000 rpm/sec. A two-machine benchtop motor/generator test stand was constructed for initial testing and tuning of the VFD and sensorless control algorithm. A gas blow-down test stand was constructed to test the mechanical operation of the hybrid-electric turbocharger and speed control using the VFD. In addition, a liquid-pump cart was assembled for high-temperature testing of the VFD. Initial on-engine testing is planned for later this year. This paper intends to present a design overview of the in-line, hybrid-electric device, VFD, and performance characterization of the electronics and sensorless control algorithm.

scholarly journals MATLAB /Simulink Modelings and Experimental Design of Variable Frequency Drive for Speed Control of Three-Phase Induction Motor

2019 ◽  
Vol 8 (2) ◽  
pp. 3046-3052
Keyword(s):  
Induction Motor ◽  
Continuous Process ◽  
Speed Control ◽  
Drive System ◽  
Variable Frequency ◽  
Inrush Current ◽  
Variable Frequency Drive ◽  
Matlab Simulink ◽  
Three Phase ◽  
Wide Range

This paper presents the PWM (Pulse Width Modulation) based speed control of three-phase asynchronous (Induction) motor. Induction motor is the leading machine used in many industrial controls, automation processes and in the field of HVAC applications. However, induction motor has fixed rated speed when directly connected to ac supply. It is necessary to design a drive system to obtain variable speed at its output to fulfill the application requirement. For this reason, we have designed a “VFD (Variable Frequency Drive)”, which gives desired speed- according to load changes unlike the DC motors, which do not require any speed controlling drive. Currently with the technological elevation in drive systems, the speed control of induction motor is more economical, convenient, reliable, and accurate. It provides continuous process control over a wide range of speed. VFD not only controls the speed of induction motor but also make its starting smooth by reducing starting inrush current and improves power factor. In result, power consumption is also reduced. In this paper, we have designed and analyzed the MATLAB/Simulink model of open loop drive system and then implemented an experimental hardware design.

Characterization of lead-bearing phases in municipal waste combustor fly ash

1996 ◽  
Vol 54 ◽  
pp. 516-517
Author(s):  
L. L. Sutter ◽  
G. R. Dewey ◽  
J. F. Sandell
Keyword(s):  
Fly Ash ◽  
Bottom Ash ◽  
Municipal Waste ◽  
Primary Concern ◽  
Leaching Behavior ◽  
Waste Combustion ◽  
Lead And Cadmium ◽  
Lead Speciation ◽  
Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

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