Drive Regulator for Electric Machine Using Pre-control
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Solution Overview
Problem
Existing drive control systems for electric machines face challenges in achieving rapid and precise control of torque and speed due to delays in feedback loops and limitations in voltage supply, leading to suboptimal control behavior.
Innovation Solution
A method that employs a pre-control device to generate a pre-control value without feedback, combined with an estimation device to quickly estimate the actual value, allowing for dynamic adjustment of the operating variable and maximizing bandwidth without interference from the controller, using a model of the electrical machine to simulate energy storage and account for voltage limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a controller is used to regulate the operating variable with feedback, then the control accuracy is improved and disturbance variables are compensated, but the response time increases due to the delay in determining the actual value
Solution Approach 1:
The pre-control device calculates a pre-control value in advance based on the setpoint and a model of the electrical machine, without waiting for feedback from the actual value. This preliminary action allows the system to start adjusting the operating variable immediately, reducing the response time while maintaining control accuracy through subsequent correction by the controller
2Loss of time
If a pre-control is used to increase the bandwidth and reduce adjustment time, then the response time is improved, but the control signal must be limited which deteriorates the control behavior
Solution Approach 1:
The pre-control value acts as an intermediary that prepares the system for the setpoint change by calculating the necessary adjustment in advance. The controller then uses this pre-control value as a basis for further regulation, combining the fast response of pre-control with the reliability of feedback control to achieve both rapid adjustment and maintain control behavior
Solution Approach 2:
The system changes the control parameter by introducing a pre-control value that is calculated based on the setpoint and machine model. This parameter change allows the system to operate in a mode that enables faster response while the controller adjusts parameters to maintain stability and prevent deterioration of control behavior
3Stability of the object's composition
If the voltage supply is limited by the intermediate circuit, then the power supply stability is improved, but the ability to achieve rapid current change and fast control behavior is reduced
Solution Approach 1:
The pre-control device calculates the required voltage in advance based on the desired current change and machine model. By preparing the control signal beforehand and using the available voltage from the intermediate circuit efficiently, the system can achieve the maximum possible current change rate within the voltage limitations, maintaining both power supply stability and fast control response
Data Source
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AI summary
The method involves receiving a digital reference value (26) for an operating variable of an electric machine at a reference value-input (24) by a drive regulator (22). A precontroller value (40) is produced at a control output (28) based on the reference value by a dynamic voltage precontroller (38). A d-component (Ud) of a complex voltage is adjusted by the output. An actual value (44) of the variable is estimated by an estimating device (42). Another precontroller value (50) is produced from a difference value (48) between the reference value and the estimated value by the precontroller. Independent claims are also included for the following: (1) a drive regulator (2) a computer program product comprising instructions for performing a method for regulating an operating variable of an electrical machine.