Hybrid Reactive Power Control for Wind Park Grid Stability
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Solution Overview
Problem
Existing reactive power regulation systems in wind parks face challenges in balancing stability and quick reaction to grid abnormalities, with centralized control being stable but slow to react, and decentralized control being quick but potentially unstable.
Innovation Solution
A method that combines centralized and decentralized control by allowing local reactive power control systems in wind turbines to switch between central and local control modes based on measured grid conditions, using local limit values and rates to determine when to switch and adjust reactive power generation, ensuring stable operation during normal conditions and quick response in exceptional conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If centralized control is used for reactive power regulation in wind parks, then stability is improved, but response speed to grid abnormalities deteriorates
Solution Approach 1:
The control system dynamically switches between centralized and decentralized control modes based on grid conditions. During normal operation, centralized control maintains stability. During abnormal conditions (voltage/frequency deviations), the system transitions to decentralized control where individual wind turbines autonomously adjust reactive power, enabling rapid response without waiting for central control commands.
Solution Approach 2:
The control system is segmented into hierarchical levels: centralized control for overall coordination during normal conditions, and decentralized local control for rapid autonomous response during abnormalities. This segmentation allows each level to operate independently based on specific conditions, resolving the contradiction between stability and response speed.
2Speed
If decentralized control is used for reactive power regulation in wind parks, then response speed to grid abnormalities is improved, but control stability deteriorates
Solution Approach 1:
The system dynamically selects control mode based on real-time grid conditions. Decentralized control is activated only during abnormal conditions when rapid response is critical, while centralized control handles normal operations to maintain stability. This dynamic adaptation resolves the stability-issue by limiting decentralized control's use to appropriate scenarios.
3Productivity
If wind parks generate maximum active power continuously, then productivity is improved, but grid support capability deteriorates
Solution Approach 1:
The system changes operational parameters (active and reactive power output) based on grid conditions. During normal operation, wind turbines generate maximum active power for optimal productivity. When grid abnormalities occur (voltage drops, frequency deviations), the system adjusts power output parameters to provide grid support, including reactive power compensation and active power curtailment if necessary.
Solution Approach 2:
Power generation levels are dynamically adjusted based on real-time grid conditions. The system transitions from maximum power generation mode during normal operation to grid support mode during abnormalities, automatically modulating active and reactive power output to balance productivity requirements with grid stability needs.
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
The present invention relates to a method of reactive power regulation in a wind turbine comprising a local reactive power control system adapted to operate in a central control mode and a local control mode, a method of reactive power regulation in a wind park connected to an electrical grid, and to a wind park.