Power Grid Model Analysis Device for Transient Stability Simulation
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Solution Overview
Problem
Current methods for simulating transient stability in electric power systems with natural energy generators are inefficient due to high computing times and potential calculation errors, especially when dealing with multiple interconnected small-scale natural energy power supplies, and lack a specific technique for contracting natural energy power generators during system faults.
Innovation Solution
An electric power system model analysis device creates a contraction analysis model by selectively contracting natural energy power supplies based on fault conditions, reducing simulation time while maintaining analysis accuracy by determining which generators can continue operation during faults, thereby avoiding errors in stability limit calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simulation is performed to accurately simulate many small-scale natural energy power supplies at multiple points, then analysis accuracy is improved, but simulation time increases
Solution Approach 1:
The patent segments the electric power system into multiple regions, each containing natural energy power supplies. By dividing the system into manageable segments, the simulation can process each region separately rather than handling all power supplies simultaneously, thereby reducing overall simulation time while maintaining accuracy through region-specific analysis.
Solution Approach 2:
The patent merges multiple small-scale natural energy power supplies within the same region into a contracted model. By combining these distributed power supplies into a simplified representation that preserves their collective electrical characteristics, the simulation achieves both computational efficiency and accurate representation of the aggregated power supply behavior.
2Productivity
If a contraction model is created by reducing the number of generators and system nodes/branches, then simulation time is reduced, but analysis accuracy deteriorates
Solution Approach 1:
The patent applies local quality by creating contraction models with different levels of detail for different regions. Regions with natural energy power supplies that have similar FRT characteristics are contracted with appropriate detail, while critical regions maintain higher fidelity. This ensures each local region is modeled with the necessary accuracy for its specific role in the system.
Solution Approach 2:
The patent changes key parameters such as FRT characteristics, impedance values, and power output characteristics when creating contraction models. By carefully adjusting these parameters to represent the aggregated behavior of multiple power supplies, the contraction model maintains accurate electrical characteristics while reducing the number of individual components that need to be simulated.
3Reliability
If natural energy power generator operation is determined based on FRT requirements during system fault, then operational compliance is improved, but transient stability analysis complexity increases
Solution Approach 1:
The patent performs preliminary determination of natural energy power generator operation status based on FRT requirements before conducting the main transient stability simulation. By pre-assessing which generators will continue operation or disconnect based on fault conditions and FRT compliance, the simulation setup is simplified and the actual stability analysis focuses only on the relevant post-fault system configuration.
Data Source
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AI summary
Analysis of a natural energy power source linked to many locations requires an extremely large amount of computation time, so the calculation time is shortened by means of a reduction. However, the determination as to whether each natural energy power source can be reduced is not made in accordance with grid accident conditions, so the analytical precision of a grid reduction model is low. To solve this problem, the present invention is a power grid model analysis device that creates a reduced analysis model for a power grid, and is characterized by being equipped with an accident condition setting unit that sets an accident condition that includes the location and the nature of an accident in the power grid, and a natural energy reduction site determination unit that, on the basis of the accident condition and the voltage state at the time of the accident, determines whether a power grid that includes a natural energy power source can be reduced, wherein the natural energy reduction site determination unit determines that reduction is not possible when a natural energy power source for which reduction is not possible exists within a prescribed range of the power grid, and determines that reduction is possible when a natural energy power source for which reduction is not possible does not exist within the prescribed range of the power grid