Speed Servo System Considering Voltage Saturation of Indiredt Vector Control System

Abstract

A robust servo system is important for performance improvement of motion control systems to several in dustry applications. Generally, these robust servo systems are constructed as PI controllers, H°O controllers and so on. These control systems have the output limitation concerning both the capacity of actuator and the safety of system. When a servo system with integral element has a large error input, it often leads to output saturation and sometimes a windup phenomenon takes place. Ordinarily, in order to overcome this prob lem, the conventional anti-windup approach is to stop integral and additional calculations of servo system. However, the speed servo system with the conventional anti-windup algorithm sometimes has an oscillated response, and moreover, the actual voltage limitation is carried out on the axis of three phase alternating current. This paper proposes both a new anti-windup algorithm considering the phase voltage saturation and a new phase compensation algorithm for the vector control system of induction motor. The experimental results and the numerical simulation results show that the speed servo system having the proposed algorithms regulates a motor speed smoothly and stably for a large and quick motor speed reference.

Anti‐windup algorithm with priority to proportional control output of speed PI controller for precision servo system

“…As is evident from Table 1, the control band of the current control system is sufficiently wider (by a factor of more than 10) than the speed control and position control. Since manipulated variable saturation in the current control system is handled speedily by the inverter control for voltage saturation combined with the previous anti-windup algorithm [4][5][6], the speed controller and position controller are hardly affected at all.…”

“…The authors previously proposed and verified a method of dealing with manipulated variable saturation in the voltage reference for current control output [3][4][5][6]. However, position servo systems for industrial applications have a triple-loop structure involving a position controller, a speed controller, and a current controller, and a limiter is applied to the output of every controller (manipulated variable).…”

“…Exist- ing strategies to combat manipulated variable saturation in servo systems include integration stopping [1,2] and feedback of the limit deviation to the integrator [3][4][5][6][9][10][11][12][13]. The limit deviation includes both the proportional control output and the integral output (overintegrated manipulated variable); these two components are unrelated to each other.…”

Rapid and Stable Speed Response Based on Current Differential Signal and Priority Amplitude Method of SVM in Flux-Weakening Region of SPMSM

“…The integral calculation of the current controller should be corrected by considering the voltage saturation to prevent an unstable response. Figure 3 shows the block diagram of a PI controller considering output variable saturation, which is the anti-windup control (8)- (11) . Where, K p : proportional gain, K i : integral gain, F(s): conditioning gain.…”

Maximum Torque Response Control based on Maximum Torque Control Frame

“…ΔL is the error of difference between L q and L d , and Δφ L is the error of φ caused by ΔL. The relation between Δφ L and ΔL is expressed as (5). However, it is difficult to determine the relation between Δφ L and the motor torque because of it varies nonlinearly.…”