Stabilization Controller for Wind Power Grid Voltage Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power distribution networks face instability and self-reinforcing destabilization after a grid fault, particularly due to voltage drops and inadequate reactive current support from synchronous generators, leading to potential total failure.
Innovation Solution
A method involving a stabilization controller with an increasing step response is activated post-grid fault, initially prioritizing active current feed-in, and if voltage stabilization is not achieved, the method increases reactive current feed-in beyond normal operational limits, prioritizing reactive current over active current to support voltage stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If synchronous generators provide reactive current support during voltage stabilization phase after grid fault, then voltage stability improves, but the generators are only able to provide limited reactive current due to their operational constraints
Solution Approach 1:
The converter-fed power generation system performs multiple functions: it operates as a standard power generator during normal conditions and transforms into a voltage stabilization device with enhanced reactive current capability after grid faults. The converter enables the system to switch between different operational modes, providing both active and reactive power support when needed, thus making the system universal in its functionality.
Solution Approach 2:
The invention changes the operational parameters of the power generation system by adjusting the converter's control mode from standard active power control to reactive current prioritization mode. This parameter change allows the system to exceed normal reactive current limits temporarily, providing the additional voltage support needed during the critical stabilization phase after fault clearance.
2Stability of the object's composition
If converter-fed power generation systems prioritize reactive current feed-in beyond normal limits to stabilize voltage, then voltage stabilization improves, but active power feed-in must be reduced
Solution Approach 1:
The system dynamically adjusts its operational characteristics based on grid conditions. During normal operation, the converter maintains standard active power feed-in. After fault clearance and during the voltage stabilization phase, the control system dynamically switches to prioritize reactive current feed-in, temporarily reducing active power output to enable the higher reactive current needed for voltage support.
Solution Approach 2:
The invention implements periodic monitoring of voltage conditions and alternates between normal operational mode and stabilization mode. The control system continuously assesses grid status and periodically switches operational priorities, activating reactive current prioritization only during the critical stabilization window after fault clearance, then returning to normal active power feed-in once voltage is restored.
3Reliability
If the stabilization controller increases reactive current feed-in beyond normal operational limits, then the contribution to network stabilization increases, but the system operates outside normal operational parameters
Solution Approach 1:
The control system is pre-configured with fault detection and response capabilities. Upon detecting grid fault conditions, the stabilization controller is already prepared to activate and immediately begin monitoring voltage levels, so that when the critical stabilization phase begins after fault clearance, the system can rapidly transition to enhanced reactive current feed-in without delay.
Solution Approach 2:
The invention implements a feedback control mechanism where the stabilization controller continuously monitors voltage levels and adjusts reactive current feed-in accordingly. The controller receives voltage signals from the grid, compares them against target values, and dynamically adjusts the converter's output to maintain voltage within acceptable ranges, creating a closed-loop control system that adapts to real-time conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively stabilizes the power distribution network by managing voltage deviations and reducing oscillatory instability, increasing the chances of successful network recovery even in critical and uncertain states.
Implementation Method 1
A converter 21 is interposed between the wind energy installation 14 and the power distribution network 10. The converter 21 makes it possible to set the voltage and phase of the electrical energy fed into the power distribution network 10 largely independently of the actual power generation.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The method involves connecting a power generation system (14), particularly a wind energy system to a current distribution network (10). A network failure of the current distribution network, is detected. A stabilizing controller is activated in the electricity generation system, where the voltage of the supplied electrical energy is controlled, depending on a feedback voltage signal. An independent claim is also included for a power generation system for supplying electrical energy to a current distribution network.