Decentralized Voltage Regulation in Substations
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Solution Overview
Problem
Centralized voltage regulation in electrical distribution networks is inefficient in managing voltage range violations caused by decentralized renewable energy feed-in, leading to potential power quality issues and operational complexities.
Innovation Solution
A decentralized voltage regulation system where measured voltage values from medium-voltage lines are collected and evaluated within substations to determine the target output voltage for high-voltage-medium-voltage transformers, using feedback loops and topology determination to adjust transformer settings dynamically and prevent voltage range violations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized voltage regulation is used to manage voltage range violations, then voltage control can be coordinated across the distribution network, but the system complexity and computational burden at the central control center increase significantly
Solution Approach 1:
The patent divides the centralized voltage regulation function into decentralized autonomous units at each substation. Each substation's voltage regulator independently determines optimal setpoint values based on local measured voltage values from its connected medium-voltage lines, eliminating the need for complex central coordination while maintaining voltage range compliance across the entire distribution network.
Solution Approach 2:
The patent extracts the voltage regulation decision-making function from the central control system and places it directly at the substation level. The calculation of target values for voltage regulators is removed from centralized control and performed autonomously at each substation using locally available measured voltage data, reducing central system complexity.
2Device complexity
If decentralized voltage regulation is implemented at each substation, then system complexity at the central control center is reduced, but coordination between different substations may be compromised
Solution Approach 1:
The patent implements feedback loops where measured voltage values from medium-voltage lines are continuously collected at each substation, used to calculate optimal target values for voltage regulators, and then applied to control transformer output voltages. This closed-loop feedback ensures each substation autonomously maintains voltage range compliance while adapting to changing network conditions.
Solution Approach 2:
Each substation performs self-regulation by independently collecting its own measured voltage values, calculating its own optimal voltage setpoints, and adjusting its own transformer output without requiring external coordination. This self-service capability enables decentralized operation while maintaining overall network reliability.
3Measurement precision
If measured voltage values from multiple medium-voltage lines are collected and evaluated, then accurate target output voltage can be determined, but the data processing requirements and communication load increase
Solution Approach 1:
The patent performs preliminary evaluation of measured voltage values at each substation to determine topology information and identify which measured values are relevant for target output voltage calculation. By pre-processing and filtering measurement data locally before using it for control decisions, the system reduces communication loads and accelerates the overall data processing time.
Data Source
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Figure 3a~3b
AI summary
The invention relates to a method for decentralized wide-area control, comprising the steps of receiving voltage values measured in medium voltage lines that are connected to at least two outgoing sections of a substation which are different from each other, analyzing the detected measured voltage values in the substation, and determining a rated output voltage for a transformer in the substation that is connected to the outgoing sections.