HVDC Receiving-End Stability Evaluation Using Generator Energy Attenuation
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Solution Overview
Problem
Current methods for evaluating the transient stability of HVDC receiving-end systems are complex and inefficient, requiring the solution of differential algebraic equations and calculation of unstable equilibrium points, which hinders the assessment of stability in AC/DC interconnected systems.
Innovation Solution
A method and system that collect voltage and current data at the generator port to determine the dynamic energy and its attenuation intensity, using a corresponding relationship expressed by the formula ∫(iGd·duGqdt-iGq·duGddt)dt + ∫(iGduGd+iGquGq)·(ω-ω1)dt, to assess the stability of the HVDC receiving-end system without solving differential algebraic equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-domain simulation method, method of equal area criterion or method of transient energy function is used to evaluate transient stability, then the evaluation is comprehensive, but the calculation process is complex and efficiency is reduced
Solution Approach 1:
The patent extracts only the necessary measurements (voltage and current at generator port) needed to calculate dynamic energy, eliminating the need to solve complex differential algebraic equations while maintaining evaluation accuracy through the dynamic energy attenuation intensity metric
Solution Approach 2:
The patent transforms the stability evaluation from solving complex system equations to calculating a simplified parameter (dynamic energy attenuation intensity) based on basic voltage and current measurements, changing the evaluation parameter from system state variables to energy attenuation characteristic
2Reliability
If differential algebraic equations are solved to obtain system state variables trajectory, then the transient stability assessment is thorough, but the calculation time increases
Solution Approach 1:
The patent replaces the mechanical process of solving differential algebraic equations with a direct calculation method using voltage and current measurements to determine dynamic energy and its attenuation intensity, significantly reducing calculation time while maintaining reliability
Solution Approach 2:
The patent uses voltage and current measurements as proxies to infer system energy state and stability characteristics, creating a simplified model that copies the essential stability information without requiring full system state reconstruction
Data Source
AI summary
The disclosure relates to a method and system for evaluating the stability of HVDC receiving end system and storage medium, which relates to the technical field of high voltage direct current transmission. The method includes: collecting voltage at a generator port, current at the generator port and rotational speed of the generator after eliminating fault; determining a corresponding relationship between the generator dynamic energy and the time according to the voltage at the generator port, the current at the generator port and the rotational speed of the generator; determining the attenuation intensity of the generator dynamic energy according to the corresponding relationship between the generator dynamic energy and the time; determining stability of the HVDC receiving end system according to the attenuation intensity of the generator dynamic energy.