Centralized Voltage Control System for Power Distribution Networks
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Solution Overview
Problem
The increasing interconnection of low-voltage systems due to solar power generation causes significant voltage fluctuations, making it challenging for centralized voltage control systems to maintain optimal voltage levels without increasing communication load, especially when measurement monitoring cycles are short or long.
Innovation Solution
A power-distribution-system voltage control system that includes local voltage control apparatuses adjusting control amounts every second cycle, with a centralized voltage control apparatus determining and updating voltage upper and lower limit values every first cycle, communicated via a network to maintain voltage within specified ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If centralized voltage control apparatus collects measurement information at frequent intervals to track rapid voltage changes, then voltage control accuracy is improved, but communication load increases
Solution Approach 1:
The patent divides the voltage control system into centralized and local control apparatuses. The centralized apparatus handles overall coordination and updates limit values at longer intervals, while local apparatuses perform rapid autonomous adjustments based on real-time measurements. This segmentation allows frequent voltage tracking without requiring proportional communication frequency from the centralized system.
Solution Approach 2:
The centralized voltage control apparatus determines and transmits voltage upper and lower limit values to local apparatuses in advance. These pre-established limit values enable local apparatuses to perform autonomous control without requiring continuous centralized communication, thus reducing communication load while maintaining control accuracy.
2Productivity
If local voltage control apparatuses adjust control amounts frequently to track rapid voltage changes, then voltage maintenance capability is improved, but communication frequency requirements increase
Solution Approach 1:
Local voltage control apparatuses are equipped with autonomous control capability to independently adjust control amounts based on real-time voltage measurements and pre-received limit values. This self-service mechanism eliminates the need for frequent centralized communication commands, allowing high-frequency local adjustments without proportional communication frequency requirements.
Solution Approach 2:
The centralized apparatus pre-determines and transmits voltage limit values to local apparatuses before rapid voltage changes occur. These preliminary limit value settings enable local apparatuses to autonomously respond to voltage fluctuations without requiring real-time centralized communication, thus decoupling control responsiveness from communication frequency.
3Stability of the object's composition
If centralized voltage control apparatus updates control commands frequently to respond to solar power generation fluctuations, then voltage stability is improved, but communication load increases
Solution Approach 1:
The centralized voltage control apparatus determines voltage upper and lower limit values in advance and transmits them to local apparatuses. These pre-established limit values enable local apparatuses to autonomously maintain voltage stability during solar power generation fluctuations without requiring frequent centralized communication updates.
Solution Approach 2:
The control system is segmented such that the centralized apparatus handles strategic limit value determination at lower communication frequency, while local apparatuses handle tactical real-time adjustments. This segmentation maintains voltage stability by distributing control functions across different communication frequency requirements.
Data Source
AI summary
A centralized voltage control apparatus calculates an optimum voltage distribution in a centralized control cycle period and determines, based on the relationship between the optimum voltage distribution and a proper voltage range, voltage upper and lower limit values for which a command is issued to each local voltage control apparatus taking into account voltage upper and lower limit margin amounts at respective points in a voltage control responsible range of the local voltage control apparatus for each local voltage control apparatus. The local voltage control apparatus adjusts, based on the voltage upper and lower limit values commanded from the centralized voltage control apparatus via a communication network, a control amount of a voltage control device every local control cycle shorter than the centralized control cycle period, to maintain the control voltage of the voltage control device between the voltage upper and lower limit values.