Dynamic Ramp-Rate Control for Intermittent Power Plants
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Solution Overview
Problem
Intermittent power generation plants, such as photovoltaic solar and wind farms, face challenges in managing power fluctuations due to variable meteorological conditions, leading to high energy storage requirements and increased operational costs, as existing methods often necessitate large storage systems to comply with grid code regulations.
Innovation Solution
A method that dynamically calculates the target state of charge for energy storage systems to minimize storage requirements by optimizing charging and discharging based on predicted fluctuations, reducing the size of storage systems needed to achieve the same maximum fluctuation ramp, thereby reducing investment and operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large energy storage systems are used to comply with maximum allowable ramp-rate regulations, then grid code compliance is achieved, but investment costs and operational costs increase significantly
Solution Approach 1:
The patent implements dynamic ramp-rate control that adapts to real-time weather conditions and power fluctuations. The system dynamically calculates the actual ramp-rate based on current and forecasted power output, adjusting the energy storage system's charging/discharging operations accordingly. This dynamic approach replaces static, oversized storage requirements with adaptive, condition-based control, achieving grid code compliance with smaller storage capacity.
Solution Approach 2:
The patent changes the control parameter from fixed maximum ramp-rate limits to variable ramp-rate targets based on weather forecasts and actual power measurements. By continuously updating the ramp-rate parameter according to environmental conditions and plant performance, the system optimizes energy storage usage and reduces the required storage system size while maintaining compliance.
2Reliability
If energy storage systems are sized to handle worst-case fluctuations, then maximum fluctuation ramp control is achieved, but system costs increase and storage system life decreases
Solution Approach 1:
The patent employs a feedback control mechanism that continuously monitors actual power output, compares it with forecasted values, and adjusts energy storage operations in real-time. The system uses measured power data and weather updates to refine ramp-rate calculations and optimize charging/discharging cycles. This feedback loop prevents excessive storage system utilization, reducing wear and extending operational life while maintaining effective fluctuation control.
Solution Approach 2:
The patent uses weather forecasting to predict future power fluctuations and takes preliminary actions by pre-charging or pre-discharging the energy storage system before actual fluctuations occur. This proactive approach, based on forecasted conditions, smooths power output variations without requiring the storage system to respond to every fluctuation at full capacity, thereby reducing stress and extending system life.
3Measurement precision
If meteorological forecast accuracy is improved to predict fluctuations, then ramp-rate control effectiveness increases, but investment costs increase
Solution Approach 1:
The patent applies partial forecasting by using only the most critical and cost-effective weather parameters (such as cloud cover and wind speed) rather than comprehensive meteorological data. The system implements sufficient prediction accuracy to manage ramp-rate control effectively without investing in high-cost, high-precision forecasting systems. This partial approach achieves adequate control performance at lower investment costs.
4Reliability
If the energy storage system is used frequently to control ramp-rates, then grid code compliance is maintained, but operational costs increase due to losses
Solution Approach 1:
The patent implements periodic control actions based on forecasted fluctuation patterns rather than continuous intervention. The system identifies periods when ramp-rate control is necessary and activates energy storage operations only during those specific time windows. This periodic approach, rather than continuous operation, reduces the frequency of charging/discharging cycles, minimizing energy losses while maintaining compliance during critical periods.
Data Source
AI summary
The present invention is a method for the control of power ramp-rates minimizing energy storage requirements in intermittent power generation plants, such as for example a photovoltaic solar plant, which minimizes the energy storage requirements approximately halving the size of storage systems necessary to comply with a maximum allowable ramp-rate given by a grid code regulation regarding the state of the art, reducing thus investment costs in the plant and/or carrying out a rationalized use of the energy storage system, in such a way that in order to achieve the same maximum fluctuation ramp, a minor use is done of the energy storage system, minimizing the losses and extending its working life, and therefore reducing the plant operational costs.