Converter Grid Unit Control Using Dynamic Measured Value Selection
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Solution Overview
Problem
Existing methods for operating converter-based network units in electrical networks require high computing effort due to the need to process a large number of measured values from various sensors, making them inefficient and resource-intensive.
Innovation Solution
A method where a control device selects a subset of measured values based on a predetermined selection guideline, reducing the number of values considered for control, with the guideline being time-dependent and based on predicted operating states and external data, such as load forecasts and price fluctuations, to prioritize relevant data for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all available measured values are processed for converter control, then control precision and reliability are improved, but computing effort and processing time increase significantly
Solution Approach 1:
The patent segments the complete set of measured values into multiple measured value groups, where each group contains only a subset of measured values relevant to specific control scenarios. This segmentation allows the control device to process fewer values at any given time while maintaining comprehensive coverage across different operating conditions.
Solution Approach 2:
The patent implements dynamic selection of measured value groups based on the current operating state of the electrical network. The control device dynamically determines which measured value group to use by evaluating predicted future operating states and comparing them with actual measured values, adapting the selection criteria to changing conditions.
2Productivity
If a fixed selection criterion is used for measured values, then processing speed is improved, but adaptability to changing operating conditions deteriorates
Solution Approach 1:
The patent makes the selection criteria dynamic by baseing them on predicted future operating states. Instead of using a static selection criterion, the system continuously updates the selection based on forecasts of how the electrical network will operate, allowing adaptation to changing conditions while maintaining efficient processing.
Solution Approach 2:
The patent performs preliminary determination of predicted future operating states and establishes selection criteria in advance. By forecasting future conditions and pre-determining which measured values will be most relevant, the system prepares the optimal measured value group before actual control decisions are needed, improving both speed and adaptability.
3Measurement precision
If all measured values are considered for control decisions, then measurement precision is improved, but loss of time in processing increases
Solution Approach 1:
The patent extracts only the most relevant measured values from the complete set by organizing them into targeted measured value groups. Each group contains specifically selected measured values that are most pertinent to the current control scenario, eliminating unnecessary data processing while preserving the precision needed for effective control decisions.
Data Source
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AI summary
The invention relates, amongst other things, to a method for operating a converter-based grid unit (20) which is arranged electrically within an alternating voltage portion (11) or adjacently to an alternating voltage portion (11) of an electrical grid and is connected to said alternating voltage portion electrically. In the method, a control device (24) adjusts the feed and removal of active power and/or reactive power into and from the alternating voltage portion (11) by actuation of at least one converter (21, 22) of the converter-based grid unit (20). According to the invention, a plurality of measured values is transmitted to the control device (24), which measured values at least also relate to different measured variables and/or different measurement locations within the alternating voltage portion (11) or the converter-based grid unit (20), and the control device (24) chooses a measured value group (UG) from the plurality of available measured values by choosing in accordance with a predefined selection guideline (AR), and the at least one converter (21, 22) is actuated on the basis of the measured values of the selected measured value group (UG).