Stretch Power Delivery Mode for Renewable Energy Grid Stability
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Solution Overview
Problem
Renewable energy sources often fail to match power grid demands due to variations in power production and consumption, leading to uncertainty in meeting grid needs throughout the year.
Innovation Solution
A method and system that utilize a renewable energy source (RES) and an energy storage system (ESS) to deliver power based on predicted generation, weighted grid power level requirements, and length of power delivery requirements, setting a power delivery limit to ensure consistent and predictable power supply by directing excess power to the ESS and using it when RES is not generating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If renewable energy sources operate without power delivery limits, then power generation capacity is maximized, but power delivery consistency and grid reliability deteriorate
Solution Approach 1:
The system dynamically adjusts power delivery limits based on grid conditions, energy storage state, and renewable generation forecasts. The power delivery limit is not fixed but adapts in real-time to balance maximization of power generation with consistency of delivery, resolving the contradiction between productivity and reliability
Solution Approach 2:
The control system continuously monitors grid power requirements, renewable generation predictions, and energy storage levels to adjust power delivery limits. This feedback mechanism ensures that power delivery remains consistent and reliable while maximizing generation capacity within acceptable variability bounds
2Device complexity
If renewable energy sources deliver power according to actual generation without storage, then system complexity is minimized, but power delivery duration and consistency worsen
Solution Approach 1:
The system performs preliminary charging of energy storage devices during periods of high renewable generation before power delivery is needed. This advance preparation extends the duration of power delivery without significantly increasing system complexity, as the storage devices are integrated into the existing power delivery infrastructure
Solution Approach 2:
Energy storage devices serve as intermediaries between renewable energy sources and the grid, buffering the variability of generation and enabling extended power delivery. This intermediary role extends delivery duration while adding minimal complexity compared to direct connection systems
3Loss of energy
If renewable energy sources operate without power delivery limits, then energy waste is reduced, but uncertainty in meeting grid needs increases
Solution Approach 1:
The system changes the parameter of power delivery limit based on forecasts of renewable generation and grid requirements. By adjusting this parameter dynamically, the system reduces energy waste through curtailment only when necessary while maintaining reliability by ensuring power delivery matches grid needs through coordinated control of generation and storage
4Reliability
If power delivery limit is set below predicted generation, then power delivery consistency is improved, but power generation utilization worsens
Solution Approach 1:
The system maintains continuous useful action by directing excess power from renewable generation to charge energy storage devices, which then discharge to the grid when needed. This continuous cycle ensures consistent power delivery to the grid while fully utilizing the renewable generation capacity, resolving the contradiction between reliability and productivity
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 provides consistent power to the grid, extends the duration of power delivery, and allows for advanced planning by operators, reducing uncertainty and enabling the RES to supply baseload power, thus improving grid stability and reliability.
Implementation Method 1
delivering power to the grid according to the power delivery limit from the RES and an energy storage system (ESS) electrically coupled to the RES
Data Source
AI summary
A method for delivering power to a grid. The method may include receiving a prediction of power generation for a renewable energy source (RES), receiving length of power delivery requirements of the grid, determining a stretch mode limit based on the prediction of power generation and the length of power delivery requirements such that a period of time during which the RES and an ESS can deliver power to the grid is extended to satisfy the length of power delivery requirements, wherein the stretch mode limit comprises a limit on power delivered to the grid, and delivering power to the grid according to the stretch mode limit from the RES and an energy storage system (ESS) electrically coupled to the RES, wherein the combined output of the RES and the ESS is limited by the stretch mode limit.