Power Converter Reference Map Correction for Wind MPPT Control
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Solution Overview
Problem
Existing power generation devices, such as wind and hydraulic power systems, do not account for variations in output characteristics due to installation environment, leading to suboptimal efficiency.
Innovation Solution
A control device that includes a power converter, storage for a reference map, and a controller to execute correction control for optimizing the input voltage to maximize output power, adjusting the reference map based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed reference map is used for control, then the control system is simple and stable, but the power generation efficiency does not adapt to environmental variations
Solution Approach 1:
The reference map is transformed from a static fixed value to a dynamic adjustable parameter. The correction control unit dynamically updates the reference map based on actual power output measurements across different input voltage values, allowing the system to adapt to environmental variations while maintaining a relatively simple control structure.
Solution Approach 2:
A feedback mechanism is introduced where the actual power output is measured and used to correct the reference map. The correction control unit compares measured power values with expected values and adjusts the reference map accordingly, creating a closed-loop system that improves efficiency without significantly increasing complexity.
2Productivity
If correction control is continuously executed, then maximum efficiency is maintained, but the rotational speed may become unstable under high flow conditions
Solution Approach 1:
The control strategy changes based on operating conditions. Under normal conditions, correction control is executed to maximize efficiency. However, when rotational speed exceeds a predetermined threshold, the control parameter changes to priority speed control, preventing instability while maintaining efficiency under normal operation.
Solution Approach 2:
The control mode dynamically switches between efficiency optimization and stability maintenance based on real-time rotational speed feedback. This dynamic adjustment ensures the system operates at maximum efficiency when conditions permit while maintaining stability when flow rates increase.
3Productivity
If the reference map is frequently corrected, then efficiency is optimized for current conditions, but the system response time increases
Solution Approach 1:
Instead of continuously correcting the reference map, the system performs partial corrections only when necessary. The correction control is executed selectively based on operational conditions, performing just enough adjustment to maintain efficiency without unnecessary corrections that would waste time.
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 control device ensures maximum efficiency of power generation systems by adapting to environmental variations, enhancing power output and preventing excessive rotation.
Implementation Method 1
a generator that converts rotational energy of a rotating body configured of a windmill or a waterwheel into electric energy
Data Source
AI summary
A power generation system includes a wind power generation device, a control device, and a power supply target. In power generation system, control device performs power conversion to a power generated by wind power generation device, and supplies the converted power to a power supply target. Control device has a reference map for controlling a power conversion device of the control device. Reference map is a map indicating a relationship between an input voltage to the control device (power conversion device) and an output power from the control device (power conversion device). When a start condition is satisfied, control device executes correction control for correcting reference map, and searches for a point at which an output power of power generation system is maximized while shifting the output voltage of a generator by MPPT control. Control device corrects reference map on the basis of a result of the search.