Wind Farm Power Dispatch Beyond Individual Feed-In Limits
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Solution Overview
Problem
Wind farms face inefficiencies in feeding electrical power into the grid due to strict active and reactive power limits at the grid connection point, which can lead to underutilization of wind power installations and potential disconnection from the grid if these limits are exceeded.
Innovation Solution
A method involving a farm controller that manages active and reactive power specifications across wind power installations, allowing temporary exceeding of individual power limits to comply with higher grid connection point ranges, while ensuring safety and operational conditions are met, utilizing transmission means properties and monitoring to adjust output power components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wind power installations are dimensioned to produce exactly the feed-in power limit at nominal wind speed, then compliance with the active power limit at the grid connection point is ensured, but the wind power installations are not optimally used when reactive power is not demanded
Solution Approach 1:
The patent applies dynamics by enabling the active power output of wind power installations to be dynamically adjusted based on reactive power demand. When reactive power is demanded, the active power is limited to ensure compliance with the feed-in power limit. When reactive power is not demanded, the active power limit is relaxed to allow optimal utilization of the wind power installations, thus adapting the operating point in real-time according to grid requirements.
2Productivity
If the power limit of the grid connection point is increased, then optimal utilization of wind power installations is improved, but the cost increases and it may be impossible due to grid properties
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the active and reactive power output parameters of the wind power installations based on the demanded reactive power. Instead of modifying the physical grid connection point infrastructure, the control parameters (power limits) are changed in real-time to allow the existing grid connection point to operate more efficiently and accommodate higher power outputs when conditions permit.
3Reliability
If wind power installations are designed to feed in predetermined active and reactive power, then the ability to provide reactive power is ensured, but the active power output is limited when reactive power is not demanded
Solution Approach 1:
The patent implements dynamics by making the active power output dynamic and dependent on the reactive power demand. The wind power installations are designed with the capability to provide predetermined reactive power, but the active power limit is dynamically adjusted based on whether reactive power is actually demanded. This allows the system to switch between providing reactive power support and maximizing active power generation, optimizing productivity while maintaining reliability.
Data Source
AI summary
A method for feeding electrical power into a grid at a grid connection point using a wind farm having installations connected to the point using transmission lines. The farm controller transmits active and reactive power specifications to the installations. A first power range is respectively specified at each installation and spans a range of values for active and reactive power to be fed in. The first power range has an active power limit to be complied with by the installation and a reactive power limit which can be reached by the installation and a second power range is specified at the grid connection point and spans a range of values for active and reactive power to be fed in. At least one installation respectively exceeds the active power limit, and the second power range is complied with by the wind farm at the grid connection point.