Centralized Voltage Controller Tap Position Limiting
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Solution Overview
Problem
Centralized voltage control in distribution systems is hindered by the lack of means for voltage controllers to transmit tap values, making it difficult to execute appropriate voltage control across the entire system.
Innovation Solution
A centralized voltage controller connected to local voltage control units via a communication network, which calculates and adjusts tap positions based on measured voltage values, and limits changes when tap limits are reached, allowing for effective voltage regulation without requiring external tap value transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If centralized voltage control is implemented without tap value transmission, then system-wide voltage consistency is improved, but control accuracy deteriorates due to unknown tap positions
Solution Approach 1:
The system implements feedback by monitoring actual voltage values at multiple points on the distribution line and using this information to adjust tap positions. The calculation unit receives voltage measurements from monitoring devices and feeds this information back to determine appropriate controlled amounts for each voltage controller, enabling accurate control without direct tap position transmission.
Solution Approach 2:
The patent introduces an intermediary approach by using voltage monitoring devices and calculation units that infer tap position effects through measured voltage values rather than direct communication. The calculation unit acts as an intermediary that translates voltage measurements into controlled amount adjustments, bypassing the need for direct tap position transmission while maintaining control accuracy.
2Speed
If tap position changes are not limited, then voltage control responsiveness is improved, but system reliability deteriorates due to exceeding settable ranges
Solution Approach 1:
The system performs preliminary action by determining the controlled amount and tap position changes in advance through calculation, then applying these pre-calculated adjustments to voltage controllers. This allows the system to respond quickly to voltage deviations while ensuring that changes remain within safe and operational limits, as the calculation unit pre- validates appropriate adjustment ranges.
Solution Approach 2:
The patent implements dynamics by making the change amount adaptive rather than fixed. The limiting unit dynamically adjusts the tap position change based on the current state of the voltage controller and the calculated controlled amount, allowing maximum responsiveness when within limits while preventing excessive changes that would compromise reliability. This dynamic limitation ensures operational safety without unduly restricting control effectiveness.
Data Source
AI summary
A centralized voltage controller according to the present invention includes a voltage distribution determination unit that calculates a controlled amount in each of a plurality of voltage controllers on the basis of a measured value of a voltage at each point on a distribution line, a tap position determination unit that determines a change amount of a tap position to be given to each of a plurality of local voltage control units on the basis of the controlled amount, and a tap-change-amount management unit that limits the change amount when receiving, from the local voltage control unit, a limit signal indicating that a tap position in the voltage controller controlled by the local voltage control unit is an upper limit or a lower limit of a settable range.