Three-Phase Inverter Voltage Control for Fast Stable Output
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Solution Overview
Problem
Existing three-phase inverter control systems suffer from waveform quality deterioration and system instability due to nonlinear factors, with slow response speed and poor stability in feedback control methods.
Innovation Solution
A control system and method incorporating an instantaneous value voltage controller and an equivalent effective value voltage controller that perform orthogonal decomposition feedback control on the real and imaginary axes of a two-phase rotating coordinate system, using integral compensation and a hysteresis controller to improve stability and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feedback control is performed directly by current or voltage in existing inverter control methods, then the control implementation is simple, but the response speed is slow and stability is poor
Solution Approach 1:
The patent segments the control system into two independent controllers: an instantaneous value voltage controller for fast response and an equivalent effective value voltage controller for stability. This segmentation allows each controller to specialize in one aspect, resolving the contradiction between fast response and stability that plagues single-controller systems.
Solution Approach 2:
The patent introduces a new control dimension by performing orthogonal decomposition of the effective value voltage into real-axis and imaginary-axis components. This dimensional transformation enables independent control of magnitude and phase, allowing the system to achieve both fast response and stability simultaneously by controlling different dimensions separately.
2Manufacturing precision
If existing inverter control systems use conventional feedback control, then the system structure is simple, but the output waveform quality deteriorates due to nonlinear factors
Solution Approach 1:
The control system is divided into two parallel control loops: instantaneous value control for waveform quality and equivalent effective value control for overall stability. This segmentation enables each loop to address specific quality issues without being constrained by the limitations of conventional single-loop control, thereby improving waveform quality while managing complexity through functional separation.
Solution Approach 2:
By transforming the control problem into the rotating coordinate system and decomposing voltages into real and imaginary axes, the patent adds a new dimensional framework for controlling waveform quality. This dimensional change enables precise control of nonlinear characteristics that conventional single-dimensional control cannot handle, improving waveform quality while the modular structure manages system complexity.
3Measurement precision
If an integral compensator is used in the equivalent effective value voltage controller, then the steady-state accuracy is improved, but the system complexity increases
Solution Approach 1:
The integral compensator is isolated to only the equivalent effective value voltage controller, while the instantaneous value controller remains simple and responsive. This segmentation allows the integral action to improve steady-state accuracy where needed without adding complexity to the entire control system, as each controller maintains its own simplified structure optimized for its specific function.
Data Source
AI summary
A control system for a three-phase inverter includes an instantaneous value voltage controller and an equivalent effective value voltage controller. The instantaneous value voltage controller is configured to feed back and control an instantaneous value of an inverter output voltage. The equivalent 5 effective value voltage controller is configured to perform an orthogonal decomposition feedback control on an effective value of the inverter output voltage. The equivalent effective value voltage controller is configured to perform integral compensation respectively on a real-axis voltage and an imaginary-axis voltage of a two-phase rotating coordinate system of the three-phase inverter. An output of the instantaneous value 10 voltage controller and an output of the equivalent effective value voltage controller are used to obtain the inverter output voltage through a delay stage transfer function and a controlled object transfer function.