DC Collection Bus Phasing for Wind Farm Power Quality
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Solution Overview
Problem
The integration of variable renewable energy sources into the electric power grid poses challenges for maintaining reliable grid operations and dynamic stability, particularly due to increased reactive power and energy storage system requirements, especially in decentralized and offshore wind farms, which are less tolerant to voltage quality disturbances and require extensive power electronic components.
Innovation Solution
A wind farm system with a DC collection bus that implements time-delay phasing control among turbines, reducing the need for energy storage systems by distributing power fluctuations and minimizing the number of power converters, thereby improving power quality and reducing energy storage capacity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable renewable energy sources are integrated into the electric power grid, then green energy strategies are advanced, but reliable grid operations and dynamic stability deteriorate due to increased reactive power and energy storage system requirements
Solution Approach 1:
The patent implements periodic action by introducing a time delay phasing control that staggers the power output from individual wind turbines in a periodic sequence. Each turbine's power is delayed by a specific time interval (e.g., T/N where T is total delay time and N is number of turbines), creating a periodic distribution pattern that smooths overall power fluctuations and reduces the need for energy storage systems while maintaining grid stability.
2Productivity
If decentralized and offshore wind farms are deployed, then renewable energy capacity increases, but the number of power electronic components and energy storage system requirements increase
Solution Approach 1:
The patent applies merging by combining multiple individual turbine power outputs into a single aggregated power stream through the DC collection bus. Instead of treating each turbine's power electronically independently, the system merges them temporally through phasing control, reducing the need for multiple separate power electronic conversion systems and lowering overall device complexity while maintaining high wind energy capacity.
3Quantity of substance
If time delay phasing control is implemented among turbines, then energy storage system requirements are reduced, but power exported to the grid is slightly reduced
Solution Approach 1:
The patent applies partial action by implementing a moderate time delay phasing control that provides sufficient smoothing effect to reduce energy storage requirements without excessively delaying power delivery. The delay time is optimized to achieve the minimum necessary phasing effect (just enough to reduce storage needs) rather than maximum possible delay, thus maintaining acceptable power export levels while achieving the goal of reducing energy storage capacity.
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
This approach significantly reduces the energy storage system requirements and improves power quality to the grid, leading to substantial cost savings while maintaining a constant voltage on the DC collection bus, albeit with a slight reduction in power exported to the grid.
Implementation Method 1
a rotor for capturing wind energy and converting the wind energy into a rotary motion
Implementation Method 2
an electrical induction machine for converting the rotary motion to an alternating current
Implementation Method 3
an AC/DC converter for converting the alternating current to a direct current
Implementation Method 4
an energy storage system for regulating a voltage of the DC collection bus
Data Source
AI summary
A DC bus collection system for a wind farm reduces the overall required number of converters and minimizes the energy storage system requirements. The DC bus collection system implements a power phasing control method between wind turbines that filters the variations and improves power quality. The phasing control method takes advantage of a novel power packet network concept with nonlinear power flow control design techniques that guarantees both stable and enhanced dynamic performance.