Wind Farm Control for Transient Grid Response
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Solution Overview
Problem
Existing wind farms face challenges in rapidly detecting and responding to grid faults, such as voltage dips, due to limitations in monitoring and coordinating wind turbine responses, which complicates meeting grid support requirements and verification of grid support properties.
Innovation Solution
A method where a farm control unit monitors grid state variables, particularly voltage, and transmits measured values to wind turbines at a high cycle rate during transient processes, enabling coordinated grid support measures, and allows for individualized control values to be set for each turbine based on their capacity and operational status, facilitating rapid and synchronized response to grid faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wind turbines operate independently with standard control systems, then device complexity is reduced, but grid support response speed deteriorates during transient processes
Solution Approach 1:
The patent merges the control functions of multiple wind turbines into a centralized farm control system. The farm control unit aggregates measured values from all wind turbines and coordinates their control actions, enabling synchronized grid support responses during transient processes while maintaining individual turbine operational independence during normal conditions.
Solution Approach 2:
The control system dynamically adjusts its operation mode based on grid conditions. During normal stationary operation, wind turbines operate with standard independent control. When transient processes are detected, the system automatically switches to coordinated control mode where the farm control unit transmits synchronized control values to all wind turbines, achieving rapid response without permanent complexity increase.
2Reliability
If measured values are transmitted continuously at high frequency to all wind turbines, then grid support coordination is improved, but data transmission load and system complexity increase
Solution Approach 1:
The data transmission system operates dynamically with two distinct modes: During stationary normal operation, measured values are transmitted at standard low frequency. When transient processes are detected by the farm control unit, the system automatically switches to high-frequency transmission mode, sending measured values and control values to all wind turbines at increased rates only when needed for rapid grid support coordination.
Solution Approach 2:
The transmission of measured values follows a periodic pattern adapted to grid conditions. Normal periodic transmission occurs at standard intervals, but during transient processes, the period is shortened significantly. This periodic adaptation ensures reliable coordination during critical events while minimizing unnecessary data transmission during stable operation.
3Reliability
If wind farm implements centralized coordinated control during transient processes, then grid support quality is improved, but control system complexity increases
Solution Approach 1:
The farm control unit is pre-configured with the capability to detect transient processes and automatically initiate coordinated control procedures. Detection criteria and control algorithms are prepared in advance, allowing the system to respond immediately when transient conditions occur without requiring complex real-time decision-making, thus improving reliability while managing complexity through pre-programmed responses.
Data Source
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AI summary
The invention relates to a method for feeding electric power into an electric supply network (8) by means of a wind park (2) comprising a plurality of wind turbines (4). The method comprises the steps of - feeding the electric power at a network connection point (6), - detecting at least one network state variable at the network connection point (6) by means of park control unit (14), - testing the supply network (8) for the presence of a transient process and - transmitting and/or transmitting at an increased clock rate measurement values recorded by the park control unit (14) and/or control values (i QS1, i QS2, i QS3) determined by the park control unit (14) to the wind turbines (4), if the presence of a transient process has been detected.