MIMO Model-Free Control Using Different Factors Across Channels
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Solution Overview
Problem
Existing MIMO full-form model-free control methods with a same-factor structure struggle to achieve ideal control performance in complex, strongly nonlinear MIMO systems with different characteristics between control channels, limiting their applicability.
Innovation Solution
The MIMO different-factor full-form model-free control method uses distinct penalty factors and step-size factors for each control input, allowing for customized control adjustments based on the specific characteristics of each channel, as represented by the formulae for calculating the i-th control input ui(k) with varying λi and ρi,p values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same-factor structure is used in MIMO full-form model-free control, then the implementation is concise and computational burden is low, but control accuracy and performance deteriorate in strongly nonlinear MIMO systems with different characteristics between control channels
Solution Approach 1:
The patent applies local quality by allowing each control input channel to have its own distinct penalty factor λi and step-size factors ρi,p, rather than using uniform factors for all channels. This enables each channel to be optimized according to its specific characteristics, thereby improving control accuracy for strongly nonlinear MIMO systems while maintaining the model-free approach's simplicity.
2Device complexity
If the same-factor structure is used in MIMO full-form model-free control, then the control scheme is simple, but applicability to complex plants with different channel characteristics deteriorates
Solution Approach 1:
The patent enables each control input channel to have customized penalty factors and step-size factors, allowing the control scheme to adapt to the specific characteristics of each channel in complex plants. This significantly improves applicability to strongly nonlinear MIMO systems while the overall control architecture remains relatively simple and model-free.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities by allowing different penalty factors and step-size factors for each channel, enabling the control system to dynamically adapt to varying plant characteristics and operating conditions, thereby improving versatility for complex plants.
3Ease of operation
If uniform penalty factor and step-size factor are used for all control inputs, then the control method is easy to implement, but control performance and stability deteriorate in MIMO systems with different channel characteristics
Solution Approach 1:
The patent allows each control input channel to have its own penalty factor λi and step-size factors ρi,p, enabling tailored control adjustments for each channel. This improves control stability and performance in MIMO systems with different channel characteristics while maintaining the ease of implementation through the straightforward control law structure.
Data Source
AI summary
The invention discloses a MIMO different-factor full-form model-free control method. In view of the limitations of the existing MIMO full-form model-free control method with the same-factor structure, namely, at time k, different control inputs in the control input vector can only use the same values of penalty factor and step-size factors, the invention proposes a MIMO full-form model-free control method with the different-factor structure, namely, at time k, different control inputs in the control input vector can use different values of penalty factors and/or step-size factors, which can solve control problems of strongly nonlinear MIMO systems with different characteristics between control channels widely existing in complex plants. Compared with the existing control method, the inventive method has higher control accuracy, stronger stability and wider applicability.