Wind Turbine Controller Frequency Deviation Voltage Control
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Solution Overview
Problem
Existing wind energy installation controllers struggle to effectively stabilize the electrical network by directly addressing grid frequency deviations, as they primarily rely on adjusting active power or switching consumers, which can be complex and inefficient.
Innovation Solution
A controller that converts grid frequency deviations into voltage control specifications, influencing reactive power to stabilize the network by adjusting voltage levels, which in turn affects power consumption, thereby indirectly balancing the grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active power adjustment or consumer switching is used to stabilize grid frequency, then grid frequency stability is improved, but device complexity and operational complexity increase
Solution Approach 1:
The patent introduces voltage as an intermediary parameter between grid frequency deviation and active power balance. Instead of directly adjusting active power or switching consumers, the controller converts frequency deviations into voltage control specifications, which then indirectly influence power consumption through the voltage-power relationship of grid-connected loads. This intermediary approach simplifies the control mechanism while maintaining frequency stability.
Solution Approach 2:
The patent replaces direct mechanical/power-based frequency control (active power adjustment, consumer switching) with an electrical field-based control mechanism (voltage regulation). By utilizing the electrical property of voltage to influence power consumption indirectly, the system achieves frequency stabilization through a more elegant electrical control pathway rather than complex mechanical or operational interventions.
2Ease of operation
If voltage control specifications are used to stabilize the network, then control simplicity is improved, but risk of overloading wind energy plant components increases
Solution Approach 1:
The patent applies partial action by using only the necessary portion of voltage control capability to achieve frequency stabilization. The controller converts frequency deviations into proportional voltage adjustments rather than extreme voltage changes, ensuring that voltage control specifications remain within safe operational limits for wind energy plant components while still achieving the desired frequency stability effect.
Solution Approach 2:
The system incorporates feedback by continuously monitoring grid frequency and adjusting voltage control specifications accordingly. The controller processes measured frequency values and external requirements to determine appropriate voltage adjustments, creating a closed-loop control system that automatically adapts to changing grid conditions while maintaining component safety through controlled voltage variations.
3Power
If voltage is increased to boost power consumption for grid balance, then power balance is improved, but risk of network destabilization increases
Solution Approach 1:
The patent applies preliminary anti-action by preemptively limiting voltage control specifications to prevent network destabilization. The controller incorporates threshold limits that constrain voltage adjustments, ensuring that while voltage is adjusted to influence power consumption and improve power balance, the adjustments remain within safe boundaries that prevent harmful oscillations or instability in the electrical network.
Data Source
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AI summary
The invention relates to a control system for a wind turbine/wind farm (1-5). The control system (7) is designed to process measured values (65) and/or external requirements (72) in order to determine control parameters for the operation of the wind turbine/wind farm (1-5). The control system (7) includes an input for an actual value (71) of the grid frequency. According to the invention, the control system (7) converts a deviation of the actual value (71) of the grid frequency from a setpoint (76) of the grid frequency into a control parameter (33) for the voltage. The invention also relates to an associated method. The invention can contribute to a balanced power supply and thus to grid stabilization.