Wind Power Control Apparatus for Battery Protection and Energy Stability
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Solution Overview
Problem
Conventional wind power generation systems face challenges in managing excessive wind energy, leading to increased rotational speeds and charging currents that exceed battery limits, affecting battery lifespan and power generation efficiency, and requiring long times to stabilize energy exchange between wind turbines and batteries.
Innovation Solution
A power controlling apparatus with a controlling unit that uses PI controllers and switching signals to manage input and output currents and voltages, including a brake unit to regulate input current and adjust output voltage, ensuring balanced energy distribution between wind turbines, batteries, and brake units, employing piecewise PI computation to optimize charging modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wind turbine operates at high rotational speed to increase power generation, then the power output increases, but the charging current exceeds the battery's maximum rated current, affecting battery service life
Solution Approach 1:
The patent introduces a brake unit as an intermediary component between the wind turbine and battery. This brake unit acts as a mediator to absorb excess energy when the charging current exceeds battery limits, protecting the battery while allowing the wind turbine to operate at optimal speeds for maximum power generation
Solution Approach 2:
The system dynamically changes operational parameters by adjusting the brake unit's resistance based on real-time conditions. When charging current exceeds the battery's maximum rated current, the brake unit's resistance is increased to dissipate excess energy, thereby maintaining battery safety while preserving wind turbine power generation capability
2Stability of the object's composition
If the wind turbine rotational speed is directly controlled by battery output voltage, then the system achieves voltage matching, but the power generation efficiency fails to be increased and stability takes a long period to achieve
Solution Approach 1:
The patent implements a dual feedback control mechanism: (1) The brake unit receives feedback from the charging current sensor and adjusts its resistance to maintain current within battery limits; (2) The switching unit receives feedback from both input current and output voltage signals, enabling it to optimize power transfer while maintaining stability. This dual feedback approach simultaneously achieves rapid stability and maximum power generation efficiency
Solution Approach 2:
The system transitions from static voltage-based control to dynamic current-based control. The switching unit dynamically adjusts switching frequencies and duty cycles based on real-time input current and output voltage conditions, enabling the system to rapidly adapt to changing wind conditions while maintaining optimal power transfer efficiency and achieving quick energy stability
Data Source
AI summary
A power controlling method includes the following steps. A first Proportional Integral (PI) computation is performed according to an input current signal and command. Next, whether the input current signal is greater than a maximum rated charging current of a battery unit is determined to generate a switching signal for controlling a brake unit correspondingly. Then, a second PI computation is performed in accordance with the output voltage signal and a predetermined voltage command. Thereafter, the output voltage signal and the voltage command are compared to set an output current command selectively. Next, a third PI computation is performed in accordance with the output current signal and command to adjust a first pair of switching signals and a second pair of switching signals, such that a switching unit performs a corresponding switching action to adjust the output voltage signal. A power system and a power controlling apparatus are provide.