Shifted Frequency Electromagnetic Transient Simulation Optimization
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Solution Overview
Problem
Current SF-based electromagnetic transient simulations face significant errors due to the fundamental frequency not being the optimal shifted frequency, especially when dealing with signals containing multiple frequency components like harmonic voltages and oscillating voltages.
Innovation Solution
An optimization method that dynamically updates the shifted frequency at each time step based on the current amplitude and voltage frequency, determining the optimal shifted frequency to minimize errors between measured and theoretical analytic signal responses, ensuring accurate simulation results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fundamental frequency (50 Hz or 60 Hz) is used as the shifted frequency in SF-based electromagnetic transient simulation, then the simulation can proceed with a relatively large time step, but great simulation errors occur when the signal contains multiple frequency components such as harmonic voltages and oscillating voltages
Solution Approach 1:
The patent applies dynamics by making the shifted frequency adjustable and adaptive rather than fixed. The shifted frequency is dynamically updated at each time step based on the actual signal characteristics (voltage frequency and current amplitude), allowing the simulation to adapt to changing frequency conditions while maintaining both efficiency and accuracy
Solution Approach 2:
The patent changes the parameter of shifted frequency from a static fundamental frequency value to a dynamic value that varies with the actual signal frequency. By updating the shifted frequency parameter at each time step according to the measured voltage frequency and current amplitude, the simulation accurately tracks signals with multiple frequency components while preserving the efficiency benefits of SF-based simulation
2Ease of operation
If the shifted frequency is fixed at the fundamental frequency, then the simulation method is simple and easy to implement, but it cannot accurately simulate signals with multiple frequency components
Solution Approach 1:
The patent transforms the static shifted frequency into a dynamic parameter that automatically adjusts to match the actual signal frequency. This is achieved by calculating the voltage frequency and current amplitude at each time step and using these to determine the optimal shifted frequency, thereby improving reliability without significantly complicating the implementation
Solution Approach 2:
The patent implements feedback by using the measured voltage frequency and current amplitude from each time step to adjust the shifted frequency for the next time step. This closed-loop approach ensures that the shifted frequency continuously adapts to the actual signal characteristics, improving simulation reliability while maintaining a relatively simple implementation structure
Data Source
AI summary
The present disclosure provides an optimization method, a unit, and an electronic device of a shifted frequency (SF)-based electromagnetic transient simulation, comprising: determining a current amplitude and a voltage frequency based on a node voltage and a branch current calculated from a shifted frequency on a basis of a current time step; determining an optimal shifted frequency of the current time step based on the current amplitude and the voltage frequency; and updating the shifted frequency by adopting the optimal shifted frequency of the current time step for calculating a node voltage and a branch current of the next time step. The method, the unit, and the electronic device provided in the present disclosure may gradually update and optimize the shifted frequency in the simulation process so to enable the shifted frequency to reach the best, thus ensuring the accuracy of output current and voltage simulation results.