Wind Farm Output Control Device with Delay Compensation
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Solution Overview
Problem
Wind farms face challenges in maintaining stable output frequency and power quality due to the intermittent nature of wind power, leading to increased load on frequency control and potential voltage fluctuations, which can destabilize the power system and require unnecessary shutdowns.
Innovation Solution
An output control device for wind farms that includes a potential estimator, a control amount determiner, a control timing adjuster, and a control amount distributor, which calculates and adjusts the control amounts for effective and reactive power based on estimated maximum power and available generation, compensating for delays and distributing these amounts to optimize wind farm output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the control amount is calculated based on the output value transmitted from the connection point, then the control amount can be determined, but delay components are introduced due to transmission and calculation time
Solution Approach 1:
The invention applies preliminary action by predicting the output value at a future time point before it actually occurs. The prediction unit estimates what the output value will be at time t+Δt based on historical data and current trends, allowing the control system to prepare control amounts in advance without waiting for actual transmission delays to occur. This proactively compensates for the inherent transmission and calculation delays in the system.
2Productivity
If the wind farm output is controlled to satisfy system interconnection requirements, then the operating rate can be increased and system stabilization can be contributed, but the control complexity increases
Solution Approach 1:
The control system is segmented into distinct functional units: a prediction unit that forecasts output values, a control amount calculation unit that determines appropriate control amounts, and a distribution unit that allocates control amounts to individual wind power generation devices. This modular segmentation simplifies the overall control complexity by breaking down the complex task of wind farm output control into manageable, independent sub-tasks that can be processed separately and systematically.
3Loss of information
If the output value is transmitted to the control device for calculation, then the control amount can be determined, but transmission delay components are introduced
Solution Approach 1:
The invention creates a virtual copy of the output value through prediction. Instead of relying on the actual transmitted output value which suffers from delays, the prediction unit generates a predicted output value that replicates the expected future state. This predicted copy allows the control system to operate with accurate, up-to-date information without being constrained by physical transmission delays of actual measurement data.
Data Source
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AI summary
An output by a wind farm including multiple wind power generation devices is controlled by an output control device. To control the output, (1) a potential estimator estimates an outputtable maximum power amount by each wind power generation device, (2) a control amount determiner determines a control amount of the whole wind farm based on the maximum power amount estimated by the potential estimator, (3) a control timing adjuster adjusts a control timing of the control amount of the whole wind farm, (4) a control amount distributer distributes the control amount having undergone the control timing adjustment based on an available power generation amount of each wind power generation device.