Wind Power Converter Control via Sequential Drive and Phase Shifting
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Solution Overview
Problem
Conventional wind power generation systems inefficiently manage converter operation, leading to high power consumption and reduced lifespan due to constant operation of all converters regardless of wind velocity, and excessive harmonic components in AC output.
Innovation Solution
A system that sequentially drives and stops converters based on wind velocity, prioritizing converters with shorter operation times and adjusting phase differences among switching element modules to minimize power consumption and harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all converters operate continuously regardless of wind velocity, then the system maintains constant power conversion capability, but power consumption increases and converter lifespan decreases
Solution Approach 1:
The system dynamically adjusts the number of operating converters based on wind velocity and power generation conditions. The converter control unit receives wind velocity information and selectively activates or deactivates converters to match actual power needs, transitioning from static continuous operation to dynamic adaptive operation.
Solution Approach 2:
Instead of operating all converters continuously, the system operates only the necessary number of converters based on current wind conditions. When wind velocity is low or power demand is reduced, some converters are deactivated to avoid excessive power consumption while maintaining sufficient conversion capability.
2Device complexity
If a predetermined converter is always driven first, then the control logic is simple, but the lifespan of that converter is reduced due to frequent operation
Solution Approach 1:
The system pre-calculates and stores an operation sequence for multiple converters before actual operation begins. This sequence is determined based on converter capacities and is stored in advance, allowing the control unit to simply follow the pre-planned sequence without complex real-time decision-making.
Solution Approach 2:
The system changes the operational parameter of converter selection from fixed (predetermined single converter) to variable (rotating sequence among multiple converters). By cycling through different converters in a predetermined sequence, the workload is distributed across multiple units, extending individual converter lifespan while maintaining simple control logic.
3Power
If multiple converters operate in parallel, then power conversion capacity increases, but harmonic components in AC output increase
Solution Approach 1:
The system introduces asymmetric phase shifting among parallel converters instead of operating them with identical switching patterns. Each converter is assigned a different phase shift angle, creating asymmetric operation that causes harmonic components from individual converters to cancel each other out, reducing total harmonic distortion while maintaining high power conversion capacity.
4Reliability
If converters are operated based on random selection, then converter lifespan is extended through load distribution, but power versus consumption efficiency is reduced
Solution Approach 1:
The system implements feedback control by continuously monitoring wind velocity and power generation conditions, then adjusting converter operation accordingly. The converter control unit receives real-time wind velocity information and uses this feedback to determine which converters should be active, optimizing the balance between converter lifespan extension and power conversion efficiency.
Data Source
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AI summary
Disclosed herein are an apparatus (100) for driving converters (50) in a wind power generation system, an apparatus (400) for controlling converters in a wind power generation system, an apparatus for driving switching element modules in a wind power generation system, and an apparatus (7100) for controlling switching element modules (660) in a wind power generation system. The apparatus (100) for driving converters (50) in a wind power generation system includes a converter control unit (110) configured to drive a plurality of converters (50) connected in parallel between a generator (40) and a grid, wherein the converter control unit (110) sequentially drives the converters (50) one by one when output power of the grid increases and sequentially stops the operations of the converters (50) one by one when output power of the grid decreases.