Direct Drive Wind Farm Oscillation Path Tracking
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Solution Overview
Problem
The key energy transfer path of a direct drive wind farm grid-connected system cannot be accurately and effectively tracked using existing analysis methods, leading to instability and potential system-level accidents.
Innovation Solution
A method and system for tracking the oscillation path of a direct drive wind farm by collecting instantaneous values of oscillation components during dominant oscillation mode periods, calculating energy flow through coupling energy transfer paths, and identifying key energy transfer paths to ensure stability control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If linearized small signal models are used for analysis, then the analysis process is simple, but the key energy transfer path cannot be accurately tracked due to dynamic changes in operating equilibrium point
Solution Approach 1:
The patent applies dynamics by transitioning from static linearized small signal models to a dynamic energy flow analysis method. The energy flow analysis adapts to dynamic changes in operating equilibrium points by continuously tracking energy transfer paths based on actual system states, allowing accurate identification of key energy transfer paths under varying operating conditions without requiring system linearization around a fixed point.
2Measurement precision
If comprehensive data collection during oscillation periods is performed, then the energy flow calculation becomes accurate, but the calculation complexity increases
Solution Approach 1:
The patent extracts only the essential oscillation components and energy flow parameters needed for analysis during dominant oscillation periods. By focusing data collection and calculation specifically on these critical elements rather than performing comprehensive system analysis, the method achieves accurate energy flow calculation while significantly reducing computational burden and complexity.
Data Source
AI summary
A method and system for tracking the oscillation path of a direct drive wind farm involve: collecting the port current, the current and state variables of the current inner loop, the dynamic angle and state component of the phase-locked loop and the phase and amplitude of the fault point voltage of each wind turbine generator in a dominant oscillation mode period which is used as acquisition period, and then obtaining corresponding instantaneous value of each oscillation component of the direct drive wind turbine generator; obtaining energy flow of coupling energy transfer path of direct drive wind farm in each acquisition period based on the instantaneous value; tracking the key energy transfer path of the direct drive wind farm according to the energy flow, so as to realize the stability control of the direct drive wind farm.