Wind Farm Power Control for Grid Frequency Modulation
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Solution Overview
Problem
Wind farms face challenges in maintaining grid stability due to the lack of inertia and damping from power electronic converters, leading to reduced stability and penetration of wind power in the grid, with existing methods for primary and secondary frequency modulation being inefficient and overlapping.
Innovation Solution
A method and system for controlling wind farm power that acquires real-time operation state data, determines conditions for secondary frequency modulation, and generates instructions for active power control based on theoretical power, automatic generation control, and backup active power reserved for primary frequency modulation, improving system stability and wind turbine penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wind farms use power electronic converters for grid connection, then the response speed is improved, but the system loses inertia and damping, reducing stability
Solution Approach 1:
The control system pre-calculates and reserves backup active power for primary frequency modulation before frequency deviations occur. The energy management platform continuously monitors grid frequency and prepares modulation strategies in advance, enabling the wind farm to respond quickly when frequency deviations occur while maintaining stability through pre-planned control actions.
Solution Approach 2:
The system implements closed-loop feedback control by continuously monitoring grid frequency, comparing it with reference values, and adjusting active power output accordingly. The energy management platform receives real-time frequency data, processes it through control algorithms, and sends adjustment instructions to wind turbines, creating a feedback mechanism that maintains stability while enabling fast response.
2Productivity
If wind power penetration is increased, then energy supply is improved, but grid stability deteriorates due to reduced total moment of inertia
Solution Approach 1:
The wind farm's energy management platform independently performs frequency monitoring, modulation strategy calculation, and active power adjustment without requiring external control for each frequency event. The system serves itself by autonomously detecting frequency deviations, calculating required active power changes, and executing modulation commands, enabling high wind power penetration while maintaining grid stability through self-regulation.
Solution Approach 2:
The system pre-reserves backup active power capacity and pre-calculates modulation strategies before frequency deviations occur. By having ready-to-use modulation plans and reserved power capacity, the wind farm can immediately respond to frequency changes, allowing higher penetration levels without compromising stability.
3Device complexity
If traditional energy management platform is used for primary frequency modulation, then device complexity is reduced, but measurement precision and communication speed are insufficient
Solution Approach 1:
The energy management platform performs multiple functions including real-time frequency monitoring, primary frequency modulation, secondary frequency modulation, and active power management. By consolidating these functions into a single intelligent platform, the system achieves high measurement precision and fast communication speed without significantly increasing device complexity, as the platform uses integrated processing and communication resources.
4Manufacturing precision
If primary and secondary frequency modulation are controlled separately, then control precision is improved, but device complexity increases due to coordination requirements
Solution Approach 1:
The system merges primary frequency modulation and secondary frequency modulation into a unified control framework managed by the energy management platform. The platform coordinates both modulation types through integrated algorithms that consider their respective requirements, achieving precise control while reducing overall system complexity by eliminating the need for separate control systems and their associated coordination interfaces.
Data Source
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AI summary
The present invention provides a power control method, device and system for a wind power station. The power control method comprises: obtaining running state data of the wind power station and a grid connection point in real time; determining whether the state of the grid connection point meets conditions of secondary frequency modulation according to the running state data; if it is determined that the state of the grid connection point meets the conditions of secondary frequency modulation, determining a limited power instruction value according to a pre-obtained theoretical power value of the wind power station, a given value of automatic power generation control, and a standby active power value reserved for primary frequency modulation; and generating and sending an instruction used for controlling the active power of the wind generating set of the wind power station according to the limited power instruction value.