Wind Turbine Security Region Constraints in Frequency Response Dispatch
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Solution Overview
Problem
Traditional unit commitment models overestimate the frequency response capability of wind turbine generators due to neglecting their safety constraints, leading to potential instability and reduced renewable energy penetration, as they fail to consider the security region when providing frequency response.
Innovation Solution
A method for unit commitment that determines the security region of wind turbine generators by establishing output and stability constraints, incorporating rotational speed and wind power stability conditions, and integrating these constraints into the unit commitment model to ensure safe and stable operation while providing frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wind turbine generators are allowed to provide frequency response without security constraints, then the frequency response capability is improved, but the system reliability deteriorates due to potential instability
Solution Approach 1:
The patent transforms the security constraints into explicit mathematical parameters (rotor speed constraints ωmin≤ωr≤ωmax, active power constraints, and stability boundary equations). By parameterizing the security region boundaries based on rotor dynamics and aerodynamic characteristics, the model quantifies the safe operating limits for frequency response provision, resolving the contradiction between maximizing frequency response capability and ensuring system reliability.
2Device complexity
If traditional unit commitment models are used without security region constraints, then the computational simplicity is improved, but the measurement precision deteriorates due to overestimation of frequency response capability
Solution Approach 1:
The patent performs preliminary derivation of the security region boundaries before the unit commitment optimization. By pre-calculating the stability boundaries based on rotor speed limits and aerodynamic characteristics, and pre-formulating the constraint equations, the complex security assessment is completed in advance. This allows the main optimization model to directly apply these pre-established constraints without real-time complex calculations, maintaining computational efficiency while achieving precise frequency response capability assessment.
Data Source
AI summary
The present invention discloses a unit commitment method considering security region of wind turbine generators with frequency response control, and the main steps are: 1) determining security region of wind turbine generators when provides frequency response; 2) based on the security region of the wind turbine generators when provides frequency response, establishing a unit commitment model considering security region of wind turbine generators; and 3) calculating the unit commitment model considering the security region of the wind turbine generators by using mixed-integer linear programming method, and obtaining the operation result of the unit commitment considering the security region of the wind turbine generators with frequency response control. The present invention can be widely used in the setting of frequency response parameters of wind turbine generators dispatched in the prior art and the start-stop and output plans of synchronous generator.