Wind Farm Reactive Power Loss Detection by Operating Point Comparison
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Solution Overview
Problem
Existing methods for detecting power losses in wind power systems are inaccurate and fail to distinguish between active and reactive power contributions, complicating cost-benefit planning and efficiency analysis.
Innovation Solution
A method involving current and voltage measurements to detect overall power loss, estimating reactive-power power loss by comparing it to active-power power loss at different operating points, and constructing a database of reference power losses to accurately assign losses to reactive power infeed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive power is fed in to support the electrical supply grid, then grid voltage stability is improved, but operating point-dependent losses in the inverter increase
Solution Approach 1:
The patent segments the total power loss into two distinct components: active power-dependent losses and reactive power-dependent losses. By measuring the operating point (active power P and reactive power Q) and using the relationship Loss = f(P,Q), the system can separately identify and attribute losses to each power component, enabling accurate economic evaluation of reactive power support operations.
2Difficulty of detecting and measuring
If model-based retrospective determination is used to detect losses caused by reactive power, then detection capability is provided, but measurement precision is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the actual operating point (P,Q) is continuously measured and fed back to the loss calculation. The loss function f(P,Q) is updated based on real-time operating conditions, allowing the system to accurately determine the current power loss and attribute it to active and reactive power components, thereby achieving high measurement precision.
Data Source
AI summary
Provided is a method for detecting a power loss when operating a wind power system including a wind power installation and which feeds electrical power into a grid. The electrical power is fed into the grid with an active and reactive power component at a current operating point. The method includes detecting an overall power loss caused by feeding in the electrical power at the current operating point, and estimating a reactive power loss caused by feeding in the reactive power component at the current operating point. The reactive power loss is determined from a difference between the overall power loss and an active power loss assigned to the current operating point. The active power loss corresponds to a power loss of a comparison operating point where the same amount of active power is fed in as at the current operating point, but no reactive power is fed in.