Microgrid Load Shedding Control Minimizing Overshed
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Solution Overview
Problem
Existing load shedding control systems in power systems often result in excessive load shedding, particularly in microgrids where loads do not have strict priorities or dependencies, leading to unnecessary disruptions and inefficiencies, as they prioritize based on load values rather than minimizing the excess power generation shortfall.
Innovation Solution
A control system that evaluates potential combinations of loads to shed using a tree data structure, selecting the combination that minimizes load overshedding within a defined deadband, ensuring that the power generation balances with power demand while adhering to response time constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If load shedding control systems prioritize based on load values, then load shedding decisions can be made quickly, but excessive load shedding occurs leading to unnecessary disruptions
Solution Approach 1:
The system changes the parameter used for load shedding priority from load value to a composite metric that considers both load value and the impact of shedding on system balance. This is achieved by calculating a priority metric that incorporates the difference between generation and demand, allowing the system to minimize overshedding while maintaining fast decision-making capability.
Solution Approach 2:
The system implements feedback by continuously monitoring the balance between power generation and demand, and using this information to dynamically adjust load shedding priorities. The priority metric is updated based on real-time system state, ensuring that load shedding decisions minimize overshedding while maintaining system reliability.
2Device complexity
If traditional load shedding methods are used, then implementation is simple, but system reliability deteriorates due to excessive load disruptions
Solution Approach 1:
The system introduces a priority metric parameter that combines load value with system balance considerations. This parameter change enables the system to maintain reliability by minimizing overshedding, while the computational complexity remains manageable through efficient calculation methods.
Solution Approach 2:
The load shedding priority is made dynamic rather than static. The priority metric changes based on real-time system conditions, allowing the system to adapt to varying generation and demand scenarios. This dynamic approach improves reliability without requiring overly complex control logic.
3Power
If more loads are shed to balance generation and demand, then power balance is achieved, but the number of affected loads increases unnecessarily
Solution Approach 1:
The system changes the optimization criterion from minimizing total load shed to minimizing overshedding (the amount by which load shedding exceeds generation loss). This parameter change allows the system to achieve power balance while affecting fewer loads, as it targets the root cause of the imbalance more precisely.
Solution Approach 2:
The system replaces traditional mechanical load shedding approaches with a computational optimization method. By using a priority metric that incorporates system balance information, the system can identify the minimal set of loads to shed to achieve power balance, thereby reducing the number of affected loads.
Data Source
AI summary
Systems and methods described herein may be used to search for a minimum load overshed in a power system. For example, a control system includes memory and a processor operatively coupled to the memory. The processor may obtain an amount of power consumed by each load in a total set of loads in a microgrid. The processor may detect a difference between the amount of power generated and the amount of power consumed. The processor may select a subset of loads to shed from the total set of loads by searching a tree of potential load shed amounts to substantially balance the amount of power generated with the amount of power consumed. The processor may send one or more signals to one or more electronic devices to cause the selected subset of loads to be shed.