Power Plant Control Proportion Determination
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Solution Overview
Problem
Existing methods for determining which power generating units to curtail and which to maintain in power plants with wind turbines lead to non-deterministic changes, affecting dynamic properties and ramping capabilities, necessitating a more deterministic approach.
Innovation Solution
A method for controlling power generation in power plants with at least three units, including wind turbines, where units are operated in either non-controlled or controlled modes based on their power capabilities, with a central controller determining the proportion of units in each mode to maintain ideal ratios and adjust status accordingly, considering available and minimum power production limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power generating units are curtailed equally or selected non-deterministically, then power reference reduction is achieved, but dynamic properties such as ramping capabilities change in an inappropriate and non-deterministic way
Solution Approach 1:
The patent applies parameter changes by determining a proportion value based on the capability parameter (difference between available power and curtailed power production) of power generating units. This proportion value dynamically controls which units should be in controlled vs non-controlled modes, changing the operational parameters deterministically based on unit capabilities rather than using fixed or random selection methods.
Solution Approach 2:
The patent implements local quality by assigning different operational modes (controlled vs non-controlled) to different power generating units based on their individual capability parameters. Each unit is evaluated locally and assigned to a mode that optimizes overall system performance, with the proportion of units in each mode determined by the calculated proportion value.
2Power
If the number of curtailed wind turbines varies non-ideally, then power curtailment is achieved, but ramping capabilities and dynamic properties deteriorate
Solution Approach 1:
The patent uses feedback by continuously monitoring the capability parameter of power generating units and adjusting the proportion value accordingly. The control system receives feedback on unit capabilities and dynamically adjusts which units are in controlled vs non-controlled modes to maintain optimal ramping capabilities while achieving required power curtailment.
Solution Approach 2:
The patent applies dynamics by making the proportion of controlled vs non-controlled units dynamic rather than static. The proportion value is calculated based on real-time capability parameters and can change as unit capabilities change, allowing the system to adapt dynamically to maintain optimal ramping capabilities throughout operation.
3Reliability
If a deterministic method is implemented to determine controlled vs non-controlled units, then dynamic properties stability is improved, but control system complexity increases
Solution Approach 1:
The patent reduces control system complexity by using a single key parameter - the proportion value - to determine the operational mode of power generating units. Instead of complex multi-parameter optimization, the system calculates one proportion value based on capability parameters and uses this to deterministically assign units to controlled or non-controlled modes, simplifying the control logic while maintaining stability.
Data Source
AI summary
The invention relates to a method for controlling power generation of a power plant which comprises power generating units including a wind turbine. At least one power unit is operated in a non-controlled mode with a non-curtailed power set-point, and at least one other power unit is operated in a controlled mode with a curtailed power set-point. Positive capabilities are determined as the difference between the available power and the curtailed power production. The total positive capability is determined as the sum of positive capabilities. The proportion of the power units intended to be operated in the non-controlled mode is determined as a function of the total positive capability. Dependent on the difference between the determined proportion and an actual proportion the status from non-controlled mode to controlled mode, or vice versa, of one or more of the power units is changed.