Electric Power System Control Equipment for Dynamic Energy Source Activation
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Solution Overview
Problem
Electric power systems with multiple energy sources face challenges in optimally activating and deactivating sources based on factors like power demand, operating costs, efficiencies, starting characteristics, and service life, particularly in varying operational modes such as open sea and harbor operations.
Innovation Solution
A method and control equipment that dynamically activate or deactivate electric energy sources by setting activation and deactivation limits based on target power values, prevailing operational modes, and the properties of energy sources, including temporal inactivity periods, cumulative service times, and efficiencies, to ensure optimal energy source utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electric energy sources are activated to meet power demand, then power supply reliability is improved, but operating costs and system complexity increase
Solution Approach 1:
The control system dynamically adjusts the activation and deactivation of energy sources based on real-time power demand, operational mode, and system state. The activation limit and deactivation limit are not fixed but adapt to current conditions, allowing the system to optimize the number of active energy sources continuously rather than using a static configuration.
Solution Approach 2:
The system changes operational parameters (activation limits, deactivation limits) based on different operational modes and power demand levels. By adjusting these threshold parameters, the system can transition between different numbers of active energy sources to balance reliability requirements against operating costs and complexity.
2Speed
If energy sources are activated frequently to respond to power demand changes, then power demand responsiveness is improved, but serviceable life time decreases
Solution Approach 1:
The control system establishes activation limits and deactivation limits in advance based on operational modes and energy source characteristics. This preliminary configuration prevents excessive or unnecessary activation/deactivation cycles by setting appropriate thresholds before operational scenarios occur, thereby reducing wear while maintaining responsiveness.
Solution Approach 2:
The system continuously monitors the actual power output and compares it against the target value and established limits. This feedback mechanism ensures that energy sources are activated only when truly necessary (when control value exceeds activation limit) and deactivated when appropriate (when control value drops below deactivation limit), preventing unnecessary cycling that would reduce service life.
3Loss of energy
If activation and deactivation limits are set low to maximize energy source utilization, then operating costs decrease, but starting characteristics requirements increase
Solution Approach 1:
The control system applies different activation and deactivation limit thresholds to different energy sources based on their individual characteristics, operational modes, and current system state. Rather than using a uniform threshold for all energy sources, each source is managed with tailored limits that consider its specific starting characteristics, efficiency curve, and operational constraints.
Data Source
AI summary
An electric power system includes electric energy sources and control equipment for controlling the electric energy sources in accordance with a target value of electric power produced by the electric power system. The control equipment activates and deactivates the electric energy sources based on a control value and on activation and deactivation limits. The control value can be the target value or the actual value of the electric power. The control equipment controls active electric energy sources according to the target value and according to power sharing defined for the active electric energy sources. The activation and deactivation limits as well as activation and deactivation order of the electric energy sources can be determined based on properties of the electric energy sources and on a prevailing operational situation of the electric power system.