Wind Power Converter Mode Switching for Low Wind Efficiency
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Solution Overview
Problem
Conventional wind power generation systems face inefficiencies at low wind speeds, particularly with doubly-fed generator sets, which have poor power generation efficiency and limited operating range due to high electricity loss and restricted operating speed, while full-power generator sets are expensive.
Innovation Solution
A wind power generation control device with a converter unit and switching unit that allows the system to switch between doubly-fed and full-power modes based on wind speed, utilizing a generator-side and grid-side converter with a DC bus capacitor, enabling efficient power flow and mode switching to optimize performance at varying wind conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a doubly-fed wind power generator set is used, then the cost is reduced, but the power generation efficiency at low wind speeds deteriorates
Solution Approach 1:
The patent implements dynamic mode switching between doubly-fed and full-power generation modes based on real-time wind speed conditions. The control system automatically transitions between modes to optimize performance: using cost-effective doubly-fed mode at high wind speeds and full-power mode at low wind speeds, thereby resolving the contradiction between cost reduction and efficiency maintenance across varying operating conditions
Solution Approach 2:
The patent changes the operational parameters of the wind power generator by adjusting the switching threshold wind speed and controlling the transition between different generation modes. By modifying the operating state based on wind speed parameters, the system achieves both cost effectiveness and maintained efficiency across different wind conditions
2Ease of manufacture
If a doubly-fed wind power generator is used, then the cost is reduced, but the operating range of power generation deteriorates
Solution Approach 1:
The patent makes the wind power generator system universal by enabling it to perform multiple generation modes (doubly-fed mode and full-power mode) within a single system. This multi-functionality allows the system to adapt to different wind speed ranges and operating conditions, effectively expanding the operating range while maintaining cost benefits from the doubly-fed configuration
3Productivity
If a full-power wind power generator set is used, then the power generation efficiency at low wind speeds is improved, but the cost increases
Solution Approach 1:
The patent segments the operating range into different wind speed zones, assigning appropriate generation modes to each segment. The system uses full-power mode only in the low wind speed segment where it provides efficiency benefits, while switching to doubly-fed mode in higher wind speed segments where cost effectiveness is prioritized, thereby reducing overall system cost while maintaining efficiency where needed
4Ease of manufacture
If a doubly-fed wind power generator is used, then the cost is reduced, but the power generation efficiency at low wind speeds deteriorates
Solution Approach 1:
The patent implements dynamic mode switching between doubly-fed and full-power generation modes based on real-time wind speed conditions. The control system automatically transitions between modes to optimize performance: using cost-effective doubly-fed mode at high wind speeds and full-power mode at low wind speeds, thereby resolving the contradiction between cost reduction and efficiency maintenance across varying operating conditions
Solution Approach 2:
The patent changes the operational parameters of the wind power generator by adjusting the switching threshold wind speed and controlling the transition between different generation modes. By modifying the operating state based on wind speed parameters, the system achieves both cost effectiveness and maintained efficiency across different wind conditions
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 improves power generation efficiency at low wind speeds by allowing the system to operate in full-power mode, expanding the operating range and reducing costs, while maintaining adaptability to different wind conditions.
Implementation Method 1
a converter unit including a generator-side converter, a DC bus capacitor and a grid-side converter
Data Source
AI summary
A wind power generation control device, coupled between a wind power generator and a power grid, includes a converter unit and a switching unit. The converter unit includes a generator-side converter, a DC bus capacitor and a grid-side converter, wherein an AC-side of the generator-side converter is coupled to a rotor-side of the wind power generator, a DC-side of the generator-side converter is coupled to the DC bus capacitor, a DC-side of the grid-side converter is coupled to the DC bus capacitor, and an AC-side of the grid-side converter is coupled to the power grid. The switching unit is configured to switch the wind power generation control device between the doubly-fed power generation operating mode and the full-power operating mode according to a wind speed. A wind power generation system uses the wind power generation control device.