Wind Power Plant Grid Supervision for Controller Saturation
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Solution Overview
Problem
Wind power plants face challenges in avoiding controller saturation during normal operation due to large control errors, which can lead to unstable situations and saturation in integral controller parts, especially when dealing with voltage and reactive power limitations.
Innovation Solution
A method is implemented to supervise electrical measurements in wind power plants by measuring electrical parameters, determining differences between measured values and reference values, incrementing event counters and flicker counters based on thresholds, and raising warning flags to prevent saturation, allowing for continuous and effective monitoring of the electrical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wind power plant responds quickly to grid voltage changes or setpoint changes, then the initial response time is improved, but large control errors occur that drive the controller to saturation
Solution Approach 1:
The supervision function performs preliminary monitoring of control errors before saturation occurs. By continuously comparing control errors against threshold values and incrementing event counters, the system detects approaching saturation conditions in advance, allowing preventive action to be taken before the controller enters an unstable saturated state.
Solution Approach 2:
The system implements feedback through event counters that track the number of times control errors exceed threshold values. When the event counter reaches a predetermined limit, a warning flag is raised, providing feedback about controller health status. This feedback mechanism allows the system to respond to accumulating errors and prevent saturation-induced instability.
2Reliability
If reactive power limits are imposed to prevent controller saturation, then controller stability is improved, but the wind power plant cannot meet grid voltage requirements
Solution Approach 1:
The supervision function enables the control system to self-monitor and self-diagnose saturation conditions without requiring external intervention or conservative reactive power limiting. By autonomously tracking control errors and raising warnings when saturation is approaching, the system maintains full reactive power capability while preventing instability through early detection rather than preventive restriction.
3Reliability
If continuous monitoring of control errors is performed, then controller saturation is prevented, but the complexity of the supervision system increases
Solution Approach 1:
The supervision function segments the monitoring task into discrete, manageable components: comparing control errors against threshold values, incrementing event counters when thresholds are exceeded, and raising warning flags when counters reach predetermined limits. This segmentation transforms a complex continuous monitoring problem into a series of simple, independent operations that are easier to implement and maintain.
Solution Approach 2:
The event counter serves as an intermediary mechanism between the control error input and the warning flag output. Rather than directly comparing continuous error signals and generating warnings, the event counter mediates by accumulating discrete events, providing a buffer that simplifies the supervision logic while maintaining effective monitoring of controller saturation conditions.
Data Source
AI summary
The present invention relates to a method for supervision of an electrical measurement in a wind power plant, with a plurality of wind turbine generators, the method comprises, a) measuring a measurement of an electrical parameter in the wind power plant, b) determining a difference between the measurement and a reference value, c) in case the difference is greater than a threshold value, incrementing an event counter, d) in case the event counter is incremented, raising a first warning flag. The invention also relates to a power plant controller arranged to supervise a wind power plant according to the method; the wind power plant comprises a plurality of wind turbine generators.