Wind Plant Storage Control for Under-Frequency Power Delivery
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Solution Overview
Problem
Wind energy plants struggle to predict and deliver a certain quantity of active power during grid under-frequency events due to the fluctuating nature of wind and unpredictability of these events, leading to potential revenue loss and increased costs through curtailed output and the need for additional turbines.
Innovation Solution
A wind energy plant equipped with power storage devices in each turbine, configured to deliver an agreed active power deficit when storage capacity is insufficient, using a frequency response module to control wind turbines and reduce auxiliary loads to ensure power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output power of wind turbines is curtailed to enable response to under-frequency events, then reliability of power delivery is improved, but productivity and revenue are worsened
Solution Approach 1:
The patent applies preliminary action by storing energy in advance using power storage devices integrated in wind turbines. During normal operation, excess energy is stored in these devices, creating a reserve that can be quickly deployed during under-frequency events. This eliminates the need for curtailment while ensuring reliable power delivery capability when needed.
2Reliability
If a separate power storage facility is added to store power for under-frequency response, then reliability is improved, but device complexity and cost are worsened
Solution Approach 1:
The patent merges the power storage function with the wind turbine structure itself. Power storage devices are integrated directly into individual wind turbines, combining the energy generation and energy storage functions in a single hybrid system. This eliminates the need for separate standalone storage facilities and reduces overall system complexity.
Solution Approach 2:
The wind turbine system is designed with multi-functionality, serving both as an energy generation device and an energy storage device. The power storage devices integrated in each turbine enable the system to perform multiple functions: normal power generation, energy arbitrage, and frequency response provision, all through a single unified platform.
3Productivity
If more wind turbines are installed to meet normal grid demand, then productivity is improved, but device complexity and cost are worsened
Solution Approach 1:
Each wind turbine in the patent is designed as a multi-functional unit that not only generates electricity but also provides frequency response capability through integrated power storage. This universality means that the same turbines that meet normal grid demand also provide ancillary services, eliminating the need for additional dedicated turbines for frequency response.
Data Source
AI summary
A wind energy plant is provided including a plurality of wind turbines and committed to provide a specified quantity of active power over a specified duration in response to a grid under-frequency event, characterized by a plurality of power storage devices, wherein the rated storage capacity of the plurality of power storage devices corresponds to the specified quantity of active power; and wherein the wind energy plant is configured to deliver an active power deficit (ΔP10S) when the stored power available in the power storage devices is less than the rated storage capacity at the time of occurrence of a grid under-frequency event.