Dynamometer Inertia Control With Multi-Gain Feed-Forward Tuning
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Solution Overview
Problem
Conventional electric inertia control devices have limited adjustability, leading to difficulties in accurately reproducing a low inertia state and causing overshoot in speed deviation due to restricted control gains.
Innovation Solution
The testing system incorporates a dynamometer coupled to a workpiece with an electric inertia control device featuring a target speed setting unit, speed controller, feed-forward controller, and torque electric current command generation unit, utilizing multiple control gains and phase adjustment to generate a torque electric current command signal, allowing for precise control of inertia characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only a control gain (Jdy1) of the feed-forward controller is included to freely adjust the control gain, then the device complexity is reduced, but the degrees of freedom of adjustment is low and overshoot occurs in the speed deviation
Solution Approach 1:
The feed-forward controller is segmented into multiple independent control gains (Jdy1, Jdy2, Jdy3) that can be adjusted separately. Each control gain corresponds to different aspects of the control response, allowing fine-tuned adjustment of system behavior without increasing overall structural complexity
Solution Approach 2:
The system introduces multiple adjustable control gain parameters (Jdy1, Jdy2, Jdy3) to change the system's adaptability. By providing multiple parameters instead of a single control gain, the system gains degrees of freedom to optimize performance and eliminate overshoot while maintaining a relatively simple device structure
2Device complexity
If only a control gain (Jdy1) of the feed-forward controller is included to freely adjust the control gain, then the device complexity is reduced, but it is not possible to make the actual angular acceleration follow the target angular acceleration
Solution Approach 1:
The control function is segmented across multiple gain parameters (Jdy1, Jdy2,Jdy3), allowing precise control of different aspects of angular acceleration response. This segmentation enables accurate tracking of target angular acceleration by adjusting each parameter's contribution to the overall control signal
Solution Approach 2:
By introducing multiple control gain parameters, the system transforms a single-degree-of-freedom control into a multi-degree-of-freedom control system. This parameter expansion enables precise control of angular acceleration characteristics, allowing the actual angular acceleration to closely follow the target angular acceleration
3Device complexity
If only a control gain (Jdy1) of the feed-forward controller is included to freely adjust the control gain, then the device complexity is reduced, but a low inertia state cannot be sufficiently reproduced
Solution Approach 1:
The system uses multiple control gain parameters (Jdy1, Jdy2, Jdy3) to accurately reproduce low inertia states. By adjusting these parameters, the system can simulate different inertia characteristics, including low inertia states that cannot be achieved with a single control gain, thereby improving the reliability of virtual inertia control
Data Source
AI summary
An electric inertia control device of this testing system generates a torque current command signal in such a way that a dynamometer behaves as an inertial body having a prescribed set inertia Jset. The electric inertia control device includes: a target speed setting unit for generating a target speed signal on the basis of a shaft torque detection signal and the set inertia; a speed controller for generating a feedback input signal on the basis of a difference signal between the target speed signal and a speed detection signal; and a feed-forward controller for generating a feed-forward input signal on the basis of the shaft torque detection signal. The feed-forward controller generates the feed-forward input signal by combining the shaft torque detection signal, multiplied by a first feed-forward gain Kff, and an integrated value of the shaft torque detection signal, multiplied by a second feed-forward gain Kfi.