Power Grid Switching Plans for Renewable Stability Constraints
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Solution Overview
Problem
Conventional power system operation plans fail to address changes in short circuit current and system stability due to the introduction and expansion of renewable energy resources, leading to inflexible system configurations and increased maintenance costs, while also being unable to maintain or improve system stability and economy.
Innovation Solution
A power system operation plan creation assistance device and method that determines optimal system configurations by analyzing snapshot power flows, extracting system switching variables, evaluating stability and economy, and displaying results to minimize transmission switching times and maintain system stability and economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power system operation plans are used, then system configuration is maintained, but system stability and economy deteriorate due to changes in short circuit current and renewable energy expansion
Solution Approach 1:
The patent implements dynamic system configuration optimization by determining optimal switching states for power system equipment at different time points. The system calculates optimal configurations based on changing conditions (renewable energy output, demand) and adjusts switching states dynamically, transforming the static conventional operation plan into a dynamic adaptive system that maintains stability while accommodating changes in short circuit current and renewable energy expansion.
Solution Approach 2:
The patent changes key parameters including switching states of power system equipment, time points for switching, and system configuration variables. By optimizing these parameters through the determination unit and calculation unit, the system adapts to changing short circuit current conditions and renewable energy integration while maintaining system stability and improving economic operation.
2Adaptability or versatility
If system configuration is optimized for renewable energy integration, then adaptability improves, but transmission switching times increase
Solution Approach 1:
The patent applies preliminary action by determining optimal switching states and configurations in advance through optimization calculations. The system pre-calculates the best switching states for different time points and conditions, so when switching is actually executed, it follows pre-determined optimal paths that minimize switching time while achieving the desired adaptive configuration for renewable energy integration.
Solution Approach 2:
The patent implements dynamic optimization that balances adaptability improvements with time loss minimization. By determining optimal switching states at specific time points and calculating the best transition paths, the system achieves flexible adaptation to renewable energy integration while controlling the duration of switching operations to minimize transmission interruptions.
3Reliability
If frequent system configuration changes are made to maintain stability, then system stability is maintained, but maintenance costs and switching operations increase
Solution Approach 1:
The patent applies partial action by determining optimal switching states that achieve sufficient system stability without requiring excessive or frequent switching operations. The optimization unit calculates the minimum necessary configuration changes needed to maintain stability under changing conditions, avoiding unnecessary switching that would increase maintenance costs while still providing adequate stability maintenance.
Solution Approach 2:
The patent implements feedback through the evaluation unit that assesses system configuration quality and the determination unit that uses this evaluation to decide on switching operations. This feedback mechanism ensures switching is performed only when and where necessary to maintain stability, optimizing the balance between stability maintenance and reduction of maintenance costs associated with frequent switching and configuration changes.
Data Source
AI summary
A power system operation plan creation assistance device and method capable of maintaining or improving system stability or economy includes an optimization target snapshot power flow determination unit that uses one or more pieces of foundational information to determine an optimization target snapshot power flow. The foundational information includes a power generation plan, a total demand prediction, a sales plan, a renewable energy prediction, a work stoppage plan, system data, and a setting value. A system manipulation variable candidate extraction unit uses the one or more pieces of foundational information and the optimization target snapshot power flow to extract a candidate for a variable for a variable manipulating the system. An optimal system configuration calculation unit uses the one or more pieces of foundational information and the system manipulation variable candidate to calculate an optimal system configuration.