Electrical Storage Control for Wind Plant Frequency Support
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Solution Overview
Problem
Existing power plants with wind turbines struggle to effectively provide frequency support to the power grid, as current energy storage systems are not optimally utilized to manage frequency deviations.
Innovation Solution
A method for controlling a power plant with an electrical storage unit and wind turbine generators, where the electrical storage unit is scheduled to charge or discharge based on predetermined power set-points, and the control direction is adjusted according to frequency deviations to maximize power changes supplied to the grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical storage unit operates with a fixed nominal charging or discharging power, then the system operation is simple and stable, but the frequency support capability is limited and cannot respond effectively to grid frequency deviations
Solution Approach 1:
The patent implements dynamic power set-point adjustment for the electrical storage unit based on real-time grid frequency deviations. Instead of operating at a fixed nominal power, the storage unit's power set-point is continuously modified according to the magnitude and direction of frequency deviations, enabling the system to adapt its power output dynamically to provide effective frequency support while maintaining operational simplicity through automated control.
2Reliability
If the electrical storage unit reverses charging direction to maximize power change, then the frequency support effectiveness is enhanced, but the control complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism where grid frequency measurements are continuously monitored and used to adjust the electrical storage unit's power set-point. The frequency deviation signal feeds back to the control system, which automatically determines the appropriate power adjustment and direction (charging or discharging). This closed-loop feedback approach enhances frequency support effectiveness while managing control complexity through systematic automated decision-making.
3Ease of operation
If the electrical storage unit is scheduled to charge or discharge according to predetermined power set-points, then the system operation is stable and predictable, but the response to unexpected frequency deviations is delayed
Solution Approach 1:
The patent implements preliminary scheduling of the electrical storage unit's operating state (charging or discharging mode) based on forecasted frequency deviations and grid conditions. By pre-positioning the storage unit in the appropriate operational mode before frequency deviations occur, the system maintains operational stability through planned schedules while enabling rapid response to actual frequency deviations when they occur, as the unit is already prepared to adjust power output immediately.
Data Source
AI summary
The invention relates to a method for controlling a power plant for providing frequency support to a power grid. The power plant comprises an electrical storage unit and a power generating system comprising one or more power generating units including at least one wind turbine generator. The method comprises setting a frequency control period, wherein the electrical storage unit is scheduled to charge or discharge according to a first power set-point and at the start of the frequency control period, charging or discharging the electrical storage unit according to the power set-point. In case of a frequency deviation, a power change of the power from the electrical storage unit is determined based on the frequency deviation. Frequency support is provided by controlling the electrical storage unit to charge or discharge according to a second power set-point determined from the power change.