Floating Frame Controller for Sensorless Power Factor Adjustment
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Solution Overview
Problem
Conventional synchronous motor control systems relying on rotor position sensors are unreliable due to mechanical and temperature issues, and existing sensorless control methods face delays and inefficiencies in power factor control, particularly during transients and in applications requiring active power factor adjustment.
Innovation Solution
A system and method for controlling power factor in a floating reference frame, using a Proportional Integrator (PI) regulator to compare desired and actual power factor, and adjusting the angle command of the current Park vector to achieve unity, leading, or lagging power factor without the need for rotor position sensors, allowing active control during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotor position sensors are used for synchronous motor control, then control accuracy is improved, but reliability deteriorates due to mechanical alignment problems and temperature incompatibility
Solution Approach 1:
The patent removes the rotor position sensor from the system entirely, replacing it with a sensorless control method that uses voltage and current measurements to estimate rotor position and achieve precise control without physical sensors
Solution Approach 2:
The patent replaces the mechanical rotor position sensor system with an electrical/software-based sensorless control system that uses mathematical models and signal processing to determine rotor position from electrical measurements
2Reliability
If conventional sensorless control methods are used, then reliability is improved by eliminating sensors, but transient response deteriorates due to delays in power factor control
Solution Approach 1:
The patent implements dynamic power factor control that actively adjusts the power factor during transients rather than maintaining a fixed value, allowing the system to optimize performance and reduce delays during acceleration and deceleration phases
Solution Approach 2:
The patent employs feedback control mechanisms that continuously monitor system state and adjust control parameters in real-time, enabling rapid response to transient conditions and reducing control delays
3Use of energy by moving object
If power factor is controlled in conventional sensorless systems, then energy efficiency is improved, but adaptability deteriorates because active power factor adjustment is limited
Solution Approach 1:
The patent implements a dynamic power factor control system that can actively adjust the power factor angle during operation, transitioning between leading, unity, and lagging power factors based on application requirements, thereby achieving both energy efficiency and adaptability
Solution Approach 2:
The patent changes the power factor parameter dynamically during operation rather than maintaining a fixed value, allowing the system to optimize energy efficiency for different operating conditions and application requirements
Data Source
AI summary
A system and method of controlling the power factor for providing either unity, leading or lagging results for the sensorless control of synchronous machines. The system and method provides an estimated angle of the phase current Park vector and uses a floating synchronous reference frame that is shifted from the estimated angle of the phase current Park vector by an angle β to allow the active control and change of the power factor during operation for applications such as producing reluctance torque of a salient pole synchronous machine during Main Engine Start (MES), and field weakening for Environmental Control Systems (ECS) and MES applications.