Grid Simulator Voltage Compensation for High-Frequency Fault Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current systems for simulating power grid conditions for testing power converters, such as those used in wind turbines, are limited in accurately replicating various grid conditions and faults, particularly high frequency events, due to latency issues in generating output signals.
Innovation Solution
A method and system that utilize a computing system to access a reference voltage value, modify it based on virtual impedance associated with simulated grid conditions, and apply phase and magnitude compensation to generate an accurate output signal for a grid simulator, which is then applied to a power converter to simulate specific grid conditions or faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a grid simulator is used to simulate power grid conditions for testing power converters, then various grid conditions and faults can be replicated, but latency issues prevent accurate replication of high frequency events
Solution Approach 1:
The system pre-calculates and stores compensation values for phase and magnitude before actual simulation occurs. By preparing compensation data in advance based on expected operating conditions, the system eliminates real-time computational latency that would otherwise distort high frequency event simulation accuracy.
Solution Approach 2:
The system continuously monitors the output signal from the grid simulator and compares it against the target grid conditions. Based on this feedback, the computing system dynamically adjusts phase and magnitude compensation parameters to correct deviations caused by latency, ensuring accurate replication of high frequency events.
2Device complexity
If the grid simulator operates without phase and magnitude compensation, then the system is simpler, but the output signal contains latency-related inaccuracies
Solution Approach 1:
The computing system acts as an intermediary between the grid simulator and the power converter under test. It processes the reference voltage signal, applies phase and magnitude compensation, and generates a corrected output signal that accurately represents the intended grid conditions, thereby isolating the grid simulator's latency issues from the testing accuracy.
Solution Approach 2:
The system dynamically changes the phase and magnitude parameters of the output signal based on the simulated grid condition and detected latency characteristics. By adjusting these parameters in real-time or near real-time, the system compensates for latency effects without requiring fundamental changes to the grid simulator hardware architecture.
3Measurement precision
If hardware changes are made to reduce latency, then high frequency event simulation accuracy improves, but the system becomes more complex and requires actual hardware modifications
Solution Approach 1:
The system replaces physical hardware modifications with computational processing. Instead of changing the grid simulator's hardware architecture to reduce latency, the invention uses software-based phase and magnitude compensation algorithms running on a computing system to achieve the same accuracy improvement, thereby avoiding hardware complexity increases.
Data Source
AI summary
A method for simulating electric power grid conditions includes accessing, with a computing system, a reference voltage value associated with an electric power grid being simulated. Furthermore, the method includes modifying, with the computing system, the reference voltage value based on a virtual impedance associated with a condition on the electric power grid being simulated. Additionally, the method includes applying, with the computing system, a phase and magnitude compensation to the modified reference voltage value. Moreover, the method includes controlling, with the computing system, an operation of a grid simulator such that the grid simulator generates an output signal based on the modified voltage value after the phase and magnitude compensation has been applied, the output signal being applied to a power converter being tested to simulate the condition.