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Research on Hardware and Software of Double-loop Cascade Speed Control System

Author: LiuYan
Tutor: WangBingShu
School: North China Electric Power University
Course: Control Theory and Control Engineering
Keywords: Cascade Speed ??Control Chopper Double closed loop AVR Microcontroller
CLC: TM921.53
Type: Master's thesis
Year: 2011
Downloads: 116
Quote: 0
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Abstract


With the continuous development of the cascade speed applications continue to expand . Relative to the frequency control system, cascade speed control system has a small footprint , low maintenance costs , low voltage converter , the converter power small . However , in most of the field application of cascade speed control system are based on the open-loop control mode , for those who require speed and high precision control Immunity good performance speed control system is clearly failing to meet required . Based on the works of modern cascade speed control system , detailed the the modern cascade speed dual closed-loop control system rotor DC circuit modeling of the major aspects of the mechanism . Determine the block diagram of the system 's dynamic model based on the establishment of the dual - loop speed control system . Engineering method, based on the design principles of the first after the current inner speed outer ring , the current loop tuning rules , typical type I system parameters the speed loop the typical type Ⅱ parameter tuning rules , respectively, the current dual closed-loop control system ring and speed ring the regulator parameter tuning . Digital control system design requirements , the the ATmega128 microcontroller ATMEL Corporation for control of the core , the completion of a digital dual closed-loop control system of soft- and hardware implementation of a program of research work . Modern digital cascade speed dual closed-loop control system hardware circuit includes ADC sampling circuit , display circuit PWM control signal output circuit , the duty cycle is set . According to the function of each part of the circuit design , software design ADC sampling program , divided by function PWM control signal output of the program , the duty cycle setting display program and digital PI controller program . Experimental development board AVR microcontroller , which verified the feasibility of the control system software design , experiments show that the various functional modules can work properly . Main function call function module , and ultimately achieve the modern cascade speed dual closed-loop digital control system .

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric drive ( electric drive ) > Control system > Cascade system
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