Centralized Voltage Control Using Estimated Unmeasured Section Changes
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Solution Overview
Problem
Centralized voltage control systems face challenges in maintaining voltage within a proper range due to limited and unreliable measurement devices, leading to potential deviations where no measuring devices are installed or have failed.
Innovation Solution
A centralized voltage control apparatus connected via a communication network to local voltage control devices, which calculates control variables based on measured values and proper voltage ranges, including estimated changes in unmeasured sections to prevent voltage deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of measuring devices is increased to cover all sections, then voltage control reliability is improved, but system cost and complexity increase
Solution Approach 1:
The system performs preliminary actions by estimating voltage changes in unmeasured sections using power flow information from measured sections before voltage deviations occur. This predictive approach allows the centralized voltage control apparatus to proactively adjust control variables for voltage controllers in unmeasured sections, preventing voltage deviations without requiring physical measuring devices in those sections.
Solution Approach 2:
The patent uses power flow information as an intermediary to indirectly obtain voltage change characteristics in unmeasured sections. Instead of directly measuring voltage in every section, the system uses power flow data from measured sections to infer and estimate voltage behavior in unmeasured sections, enabling control without direct measurement.
2Measurement precision
If measuring devices are installed at all locations, then voltage monitoring accuracy is improved, but installation cost and time increase
Solution Approach 1:
The system creates a virtual representation of voltage conditions in unmeasured sections by copying and processing power flow information from measured sections. Through power flow calculations, the system reconstructs voltage change characteristics in unmeasured sections based on data from measured sections, effectively creating a virtual measurement model that eliminates the need for physical measuring devices in every location.
Data Source
AI summary
A centralized voltage control apparatus is connected via a communication network to a plurality of local voltage control devices each controlling a corresponding voltage controller connected to a distribution line of a distribution system. The centralized voltage control apparatus includes: a voltage distribution determination unit that calculates a control variable for each of the voltage controllers on the basis of a measured value of voltage at each measurement point of the distribution line and a proper voltage range at each measurement point; and a tap position determination unit that gives a command value to each of the local voltage control devices on the basis of the control variable. At least a part of the proper voltage range at each measurement point is determined on the basis of an estimated value of a change in voltage in a section in which voltage is not measured on the distribution line.