Wind Turbine Generator Control for Grid Stability
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Solution Overview
Problem
Existing methods for controlling generators in electrical supply grids during disruptions often lead to oscillations and potential grid failures, as they do not effectively account for recurring disruptions and changes in grid conditions, causing generators to fluctuate and potentially destabilize the grid.
Innovation Solution
A method for controlling generators that involves maintaining a regular power feed at a first working point, interrupting or changing power during disruptions, and transitioning to a self-sustaining mode or counteractive mode, with controlled resumption of power at a second working point, and suppressing further feed resumption if disruptions recur within a predetermined time interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the generator interrupts or changes power feed during grid disruptions, then the generator responds to grid faults, but oscillations may occur and destabilize the grid when disruptions recur
Solution Approach 1:
The control method applies preliminary anti-action by detecting recurring disruptions and preemptively suppressing further power feed interruptions before they can cause oscillations. When a disruption pattern is detected, the controller prevents subsequent feed changes that would otherwise exacerbate grid instability, thereby counteracting potential oscillations before they occur.
Solution Approach 2:
The invention implements feedback by continuously monitoring grid disruption patterns and using this information to control subsequent power feed actions. The controller detects recurring disruptions and adjusts the power feed strategy based on the detected pattern, creating a closed-loop system that responds to actual grid conditions rather than following fixed interruption protocols.
2Productivity
If the generator resumes regular power feed after disruption, then normal power supply is restored, but the disruption may occur again causing repeated feed changes
Solution Approach 1:
The control method applies preliminary action by detecting recurring disruption patterns and preemptively suppressing further power feed resumption actions. When a disruption pattern is detected, the controller prevents automatic resumption of regular power feed, thereby avoiding the cycle of repeated interruptions and restorations that would reduce overall system reliability.
3Power
If the generator operates at first working point with regular power feed, then maximum electrical energy is fed into the grid, but the generator cannot provide sufficient power reserve during disruptions
Solution Approach 1:
The invention applies dynamics by enabling the generator to operate at different working points depending on grid conditions. During normal operation, the generator operates at the first working point with regular power feed. Upon detecting disruptions, it dynamically transitions to alternative operating modes with reduced power feed or self-sustaining operation, thereby providing necessary power reserves when needed while maximizing energy feed during stable periods.
Data Source
AI summary
A method for controlling a generator of electrical energy connected to a grid connection point of an electrical supply grid, comprising the steps of: regularly feeding electrical reactive power and electrical active power into the electrical supply grid, the generator being operated at a first working point, at which the electrical generator generates electrical reactive power and electrical active power, first interrupting or changing the feeding of the electrical reactive power and/or the electrical active power into the electrical supply grid when there is, or it is indicated that there is, a disruption in the electrical supply grid or a disruption of the feed into the electrical supply grid, resuming the regular feeding of the electrical reactive power and/or electrical active power into the electrical supply grid, the generator performing the resumption at a second working point or being ramped up to the second working point, at which the electrical generator generates and feeds in electrical reactive power and/or electrical active power, and suppressing the resumption of the feeding of the electrical reactive power and/or the electrical active power into the electrical supply grid in such a way that the electrical generator ceases feeding the electrical reactive power and/or the electrical active power for a shut-off period if an interruption has recurred within a predetermined counting time interval, or suppressing the feeding of the electrical reactive power and/or the electrical active power into the electrical supply grid in such a way that the electrical generator ceases feeding the electrical reactive power and/or the electrical active power for a shut-off period if a change of the feed has recurred within a predetermined counting time interval.