Microgrid Generator Dispatching via Efficiency Bands
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Solution Overview
Problem
Existing generator dispatching control methods for microgrids are not scalable and do not guarantee maximum efficiency, especially when incorporating renewable energy sources, leading to generator cycling issues and inefficiencies in power reliability and fuel consumption.
Innovation Solution
A generator dispatching control method that employs a plurality of generators with different rated capacities, distribution nodes, and a processor that operates generators and loads based on efficiency bands defined by system frequency droop and power demand, preventing generator cycling by introducing a response delay and using energy storage systems for peak shaving and load management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If generator dispatching is controlled based on frequency droop characteristics with fixed thresholds, then system power reliability is maintained, but generator cycling occurs and fuel efficiency is not maximized
Solution Approach 1:
The patent implements dynamic efficiency bands that adapt to system conditions, replacing fixed frequency thresholds. The control system continuously monitors system frequency and power demand, dynamically adjusting the efficiency bands to prevent generator cycling while maintaining power reliability. This dynamic approach allows generators to operate within optimal efficiency ranges without unnecessary on/off transitions.
Solution Approach 2:
The patent changes the control parameter from fixed frequency thresholds to variable efficiency bands defined by system frequency and power demand. By using multiple efficiency bands with different boundaries based on real-time system conditions, the system optimizes fuel efficiency across varying load levels while preventing generator cycling through coordinated control of multiple parameters.
2Device complexity
If traditional generator dispatching control is used without energy storage, then system simplicity is maintained, but generator cycling issues occur during transient conditions
Solution Approach 1:
The patent introduces an energy storage system as an intermediary component that mediates between generators and loads during transient conditions. The energy storage system absorbs or releases power to smooth frequency variations and prevent generator cycling, acting as a buffer that stabilizes the microgrid without requiring complex control modifications to the generators themselves.
Solution Approach 2:
The patent implements preliminary control actions by defining multiple efficiency bands in advance that anticipate transient conditions. The control system proactively adjusts generator operation based on predicted system needs, preventing generator cycling before it occurs by preparing efficiency band transitions in advance during normal operation.
3Ease of operation
If fixed frequency thresholds are used for generator switching, then control implementation is simple, but scalability to larger intelligent distributed power generation systems is limited
Solution Approach 1:
The patent creates a universal control framework using efficiency bands that can be applied to microgrids of any size or configuration. The same efficiency band methodology works for both small and large distributed generation systems, providing scalable adaptability while maintaining operational simplicity through a unified control approach that handles various system configurations.
Data Source
AI summary
A microgrid power generation system includes a plurality of generators having a plurality of different rated capacities and a plurality of distribution nodes, at least some of the distribution nodes being powered by the generators. A grid is formed by the distribution nodes, the grid includes a system frequency. A plurality of loads are powered by the grid through the distribution nodes, the loads have a power demand. A processor includes a plurality of efficiency bands, each of the efficiency bands being for a corresponding one of the generators and including a plurality of generator switching points based upon droop of the system frequency and the power demand of the loads. The processor is structured to operate the generators and the loads under transient conditions based upon the efficiency bands.