Power Conversion Apparatus Adaptive Rectification Control
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Solution Overview
Problem
Conventional power conversion apparatuses for wind power generation systems face inefficiencies and high power losses, particularly at low wind speeds or low power levels, due to their architectural limitations, where passive systems have high losses at high power and active systems are inefficient at low power levels.
Innovation Solution
A power conversion apparatus incorporating a conversion-sensing circuit, a control signal generating circuit, and a switching circuit that uses a Schmitt trigger or waveform shaping circuit to sense voltage waveform changes, generate control signals based on time intervals, and control switching elements to minimize power consumption and harmonic waves, eliminating the need for a rotor position detector and reducing line losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If passive full-bridge rectifier architecture is used, then energy loss is extremely small at low power levels, but power loss proportionally rises at high power levels
Solution Approach 1:
The patent implements dynamic switching between two operational modes: passive full-bridge rectifier mode for low power levels and active power conversion mode for high power levels. The system automatically selects the appropriate mode based on real-time power level detection, enabling adaptive optimization of energy loss across different operating conditions.
Solution Approach 2:
The power conversion apparatus is segmented into two distinct operational architectures: the passive full-bridge rectifier architecture for low power operation and the active power conversion architecture for high power operation. This segmentation allows each architecture to operate in its optimal performance range, resolving the contradiction between low power efficiency and high power adaptability.
2Productivity
If active power conversion architecture is used, then full power energy conversion is achieved at high power levels, but power loss is much larger at low power levels
Solution Approach 1:
The system dynamically adjusts its operational mode based on power level. At low power levels, it switches to passive full-bridge rectifier mode to minimize power loss. At high power levels, it transitions to active power conversion mode to maximize productivity and achieve full power energy conversion, thus resolving the contradiction between conversion capability and energy loss.
Solution Approach 2:
The patent changes the operational parameters of the power conversion apparatus by switching between different control strategies: passive rectification for low power and active PWM control for high power. This parameter change allows the system to optimize both productivity and energy efficiency across different operating ranges.
3Ease of operation
If rotor position detector is used, then instantaneous rotating speed control is achieved, but long distance line loss increases
Solution Approach 1:
The patent extracts and eliminates the rotor position detector from the system by implementing sensorless control. The control signal generating circuit determines rotor position and speed information through mathematical calculations based on voltage and current measurements, removing the need for physical sensors and associated long distance line losses while maintaining speed control capability.
Solution Approach 2:
The patent replaces the mechanical sensor-based position detection system with an electronic sensorless control system. The rotor position and speed information is obtained through electrical measurements and computational algorithms rather than mechanical sensors, eliminating the need for physical connections and reducing line losses.
4Productivity
If six active switches are used, then full power energy conversion is achieved, but device complexity increases
Solution Approach 1:
The patent segments the switching architecture into two configurations: a simplified passive full-bridge rectifier structure with fewer switches for low power operation, and an active power conversion structure with six switches for high power operation. This segmentation allows the system to use minimal complexity components when high conversion efficiency is not critical, and only activates the complex six-switch architecture when full power conversion is required.
Solution Approach 2:
The system dynamically reconfigures its switching architecture based on power level requirements. At low power levels, it uses the simpler passive rectifier configuration. At high power levels, it transitions to the active six-switch configuration to achieve full power energy conversion, thus adapting device complexity to actual operational needs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves high efficiency and low power loss across various wind speeds and power levels, minimizing current harmonic waves and eliminating the need for a position detector, thereby enhancing energy conversion efficiency and reducing operational costs.
Implementation Method 1
the conversion-sensing circuit includes a Schmitt trigger or any other waveform shaping circuit
Data Source
AI summary
A power conversion apparatus and a controlling method thereof are disclosed. The power conversion apparatus is applied with a power generation apparatus, which outputs a first signal. The power conversion apparatus includes a conversion-sensing circuit, a control signal generating circuit and a switching circuit. The conversion-sensing circuit converts the first signal into a second signal, and senses at least a voltage waveform change of the second signal to generate a time interval. The control signal generating circuit is electrically connected with the conversion-sensing circuit and outputs a control signal according to the time interval. The switching circuit is electrically connected with the power generation apparatus and the control signal generating circuit, and has a plurality switching elements. The switching circuit receives the first signal and conducts one of the switching elements according to the control signal so as to convert the first signal and output an output signal.