Off-Grid Load Stabilization Using Energy Storage Dispatch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Off-grid power generation systems face challenges in maintaining power quality due to delays in returning to a nominal bus frequency caused by changes in load, as existing stabilization methods do not allow for instantaneous injection or absorption of power.
Innovation Solution
A method and system for off-grid load stabilization that involves receiving generator and energy storage data, calculating a moving average of the system load, determining an instantaneous load value, and providing an electronic storage dispatch to the energy store to maintain system bus frequency and improve power quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stabilization methods are used in off-grid power generation systems, then system complexity is reduced, but power quality deteriorates due to delays in returning to nominal bus frequency
Solution Approach 1:
The patent introduces an energy store (battery system) as an intermediary component between the generator and the load. This mediator can instantaneously absorb or inject power to compensate for load changes, allowing the generator to maintain nominal bus frequency without directly responding to rapid load fluctuations. The energy store acts as a buffer that decouples the generator from load transients, improving power quality while keeping the generator operation simple.
Solution Approach 2:
The system performs preliminary action by pre-charging or pre-discharging the energy store in anticipation of load changes. The controller monitors load conditions and adjusts the energy store state of charge in advance, enabling instantaneous power injection or absorption when load changes occur. This preliminary preparation allows the system to respond to load transients without requiring complex real-time control of the generator itself.
2Speed
If the generator responds directly to load changes, then system complexity is minimized, but the time to return to nominal bus frequency increases
Solution Approach 1:
The energy store serves as a fast-responding intermediary that can instantaneously adjust power output to match load changes. This mediator handles the rapid response requirement, allowing the generator to operate at its optimal set point without frequent adjustments. The energy store's ability to respond in seconds or milliseconds provides the speed improvement without requiring the generator to become more complex or responsive.
Solution Approach 2:
The patent segments the power delivery function into two distinct components: the generator provides stable baseline power, while the energy store provides rapid transient response. This segmentation allows each component to be optimized for its specific function - the generator for efficiency and stability, the energy store for speed and flexibility - without requiring either component to be overly complex.
3Reliability
If the energy store is controlled to instantaneously inject/absorb power, then power quality is improved, but control complexity increases
Solution Approach 1:
The controller implements feedback control by continuously monitoring the bus frequency and load conditions, then adjusting the energy store's power output accordingly. When bus frequency deviates from nominal due to load changes, the controller signals the energy store to inject or absorb power to restore frequency. This closed-loop feedback mechanism automates the control process, managing complexity through algorithmic control rather than mechanical complexity.
Solution Approach 2:
The energy store system is designed to be self-regulating through automated control algorithms that monitor system conditions and adjust power output without external intervention. The controller independently manages the charge/discharge cycles based on real-time measurements of bus frequency and load demand, allowing the system to self-correct frequency deviations and maintain power quality without requiring complex external control infrastructure.
Data Source
AI summary
The present disclosure discloses methods, systems, and non-transitory computer-readable medium for off-grid load stabilization. For instance, the method may include: receiving generator data from at least one generator and energy storage data from at least one energy store; determining, based on the generator data and/or the energy storage data, a moving average of a system load of the at least one generator; and determining, based on the generator data and/or the energy storage data, an instantaneous load value of the at least one generator. The method may further include: determining a first electronic storage dispatch (ESD) based on the moving average of the system load and the instantaneous load value of the at least one generator; and providing the first ESD to the at least one energy store.