Renewable Power Management System for Ramp Rate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The variability of renewable energy sources like wind and solar makes it challenging to manage power delivery efficiently, leading to potential ramp rate violations and reduced energy efficiency due to curtailment or preemptive power output reductions.
Innovation Solution
A power management system that includes a control system coupled with a storage device, which processes and adjusts the power transfer rate to prevent ramp rate violations by determining changes in power generation and adjusting the power transfer accordingly, based on the state-of-charge of the storage device and set ramp rate limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power generation rate from renewable sources is allowed to vary freely, then energy efficiency is improved by capturing all available energy, but ramp rate violations occur and reliability deteriorates
Solution Approach 1:
A power storage device is introduced as an intermediary between the renewable power source and the load. The storage device absorbs excess power when generation exceeds demand and releases power when generation falls short, thereby smoothing the power delivery rate and preventing ramp rate violations while capturing all available renewable energy.
Solution Approach 2:
The control system performs preliminary action by adjusting the power transfer rate to or from the storage device in advance of potential ramp rate violations. By monitoring the power generation rate and predicting future delivery rates, the system proactively modifies storage device operations to ensure compliance with ramp rate limits before violations occur.
2Reliability
If the power delivery rate is strictly limited to prevent ramp rate violations, then reliability is improved, but energy efficiency deteriorates due to curtailment or preemptive power output reductions
Solution Approach 1:
The power storage device serves as a mediator that decouples the renewable power source from the load. It absorbs the variability of renewable generation and delivers stable power to the load, eliminating the need for curtailment or preemptive reductions while ensuring ramp rate compliance.
Solution Approach 2:
The control system dynamically adjusts the power transfer rate parameter to or from the storage device based on real-time monitoring of power generation rate and state of charge. This parameter adjustment enables the system to maintain reliability through ramp rate compliance while maximizing energy capture by adapting storage operations to current conditions.
3Reliability
If a power storage device is added to manage power delivery, then ramp rate compliance and reliability are improved, but device complexity increases
Solution Approach 1:
While adding a power storage device does increase system complexity, it provides a straightforward and proven technical solution for managing renewable power variability. The storage device acts as a simple intermediary that physically stores and releases energy, avoiding the need for complex power electronics or sophisticated control algorithms.
Solution Approach 2:
The control system employs feedback by continuously monitoring the power generation rate and state of charge of the storage device, then adjusting the power transfer rate accordingly. This closed-loop control ensures ramp rate compliance while maximizing energy capture, and the feedback mechanism is implemented through standard control system components rather than complex proprietary solutions.
Data Source
AI summary
A power delivery rate from a renewable power source to a load is managed by determining, by processing circuitry, a change in a power generation rate, determining, by the processing circuitry, whether the change in the power generation rate exceeds a limit, and then, adjusting, by control circuitry, a power transfer rate to or from a power storage device, such that the adjusting is sufficient to prevent the power delivery rate from exceeding the limit.