Grid Node Phase Monitoring for Renewable Grid Stability
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Solution Overview
Problem
The increasing integration of renewable energy sources into electricity supply grids poses challenges for grid control, as these sources have fluctuating power outputs and respond differently to frequency and voltage changes, making it difficult for control centers to maintain stability.
Innovation Solution
A method for monitoring the electricity supply grid using converter-controlled infeed units connected via grid connection points, where node voltages and phase angles are acquired at multiple grid nodes to create a comprehensive image of grid statuses, including power flows and disturbances, allowing for improved grid control and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If renewable energy sources are integrated into the electricity supply grid, then the diversity and distribution of power generation improve, but grid stability and control become more difficult
Solution Approach 1:
The patent implements a monitoring arrangement that continuously measures node voltages at multiple grid nodes and feeds this information back to a control center. This feedback mechanism enables real-time detection of voltage deviations and phase angle changes caused by renewable energy fluctuations, allowing control operators to respond promptly and maintain grid stability despite the variable nature of renewable sources.
Solution Approach 2:
The patent divides the electricity supply grid into multiple monitored segments by placing measurement points at various grid nodes throughout the network. This segmentation allows for localized monitoring of voltage conditions in different regions, enabling targeted control measures for specific areas affected by renewable energy integration rather than treating the entire grid as a single unit.
2Ease of operation
If converter-controlled infeed units are used, then the ability to control power output improves, but the complexity of monitoring and control increases
Solution Approach 1:
The monitoring arrangement is designed to serve multiple functions simultaneously: it measures node voltages for stability monitoring, determines phase angles for power flow analysis, detects disturbances for protective relaying, and provides data for control optimization. This multi-functionality reduces the need for separate specialized systems and simplifies the overall control architecture despite the complexity of converter-controlled infeed units.
3Loss of information
If node voltages are measured at multiple grid nodes, then the comprehensiveness of grid status information improves, but the quantity of data to be processed increases
Solution Approach 1:
The patent extracts only the most critical information from the measured node voltages - specifically the voltage magnitude and phase angle relative to a reference. By focusing on these key parameters rather than processing complete voltage waveforms or all possible electrical quantities, the system maintains comprehensive grid status information while minimizing the volume of data that requires transmission and processing at the control center.
Data Source
AI summary
The disclosure relates to a method for monitoring an electricity supply grid, wherein the electricity supply grid has a grid frequency and a grid topology with a plurality of grid nodes, a plurality of converter-controlled infeed units are each connected to the electricity supply grid via a grid connection point, and the grid connection points are distributed over the grid topology, comprising the steps of acquiring in each case at least one node voltage at the grid connection point or at a grid node, assigned to the grid connection point, of the plurality of grid nodes, such that a plurality of node voltages are acquired, wherein each grid connection point or grid node is assigned a location in the grid topology, which is referred to as node location, and the acquired node voltage is characterized by a node phase angle as phase angle of the node voltage, assigning an associated node location to each node voltage, and ascertaining grid statuses distributed over the grid topology from the acquired node voltages, each with an assigned node location, in particular from the node phase angles or phase relationships between at least two grid nodes.