LTC and Voltage Regulator Control for Precise Voltage Reduction
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Solution Overview
Problem
Traditional voltage reduction schemes in load tap changing transformers and voltage regulators fail to accurately achieve the requested voltage reduction due to limitations in bandwidth, leading to inadequate load management during power emergencies or high demand situations.
Innovation Solution
A system and method that adjusts the bandcenter settings while maintaining the bandwidth to achieve more precise voltage reduction, incorporating a microprocessor-controlled LTC/VR controller that temporarily modifies band edges and utilizes switched capacitor banks and reactive power compensation to enhance voltage control, along with automatic determination of operating modes during reverse power flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional voltage reduction schemes reduce the bandcenter due to bandwidth limitations, then voltage reduction is achieved, but the requested voltage reduction is not accurately achieved
Solution Approach 1:
The patent dynamically adjusts the bandcenter setting based on the requested voltage reduction percentage. Instead of using a fixed bandwidth approach, the system calculates a new bandcenter that accounts for the desired reduction level, allowing the voltage control range to adapt dynamically to different reduction requirements. This resolves the contradiction by making the bandwidth flexible rather than fixed, enabling accurate voltage reduction without being constrained by traditional bandwidth limitations.
2Productivity
If the bandcenter is reduced to achieve voltage reduction, then load reduction is achieved, but the voltage reduction is insufficient due to bandwidth constraints
Solution Approach 1:
The patent changes the key parameter of bandcenter from a fixed reference to a dynamically adjusted value based on the requested voltage reduction percentage. By modifying the bandcenter parameter rather than relying on bandwidth adjustments, the system achieves more effective load reduction while maintaining reliable voltage control. The new bandcenter is calculated to ensure that the voltage reduction meets the requested percentage, thereby improving both productivity and reliability simultaneously.
3Adaptability or versatility
If traditional voltage reduction methods are used, then some voltage reduction is achieved, but the response to varying power demands is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the actual voltage reduction achieved and compares it with the requested reduction percentage. Based on this feedback, the bandcenter is automatically adjusted to achieve the precise voltage reduction level. This closed-loop control approach enables the system to adapt to varying power demands while maintaining precise voltage reduction accuracy, resolving the contradiction between adaptability and measurement precision.
Data Source
AI summary
The present disclosure relates to a system for using load tap changing (LTC) transformers and voltage regulators (VRs) to more accurately reduce the voltage in a power transmission system. It further relates to a system for determining the operating mode for LTC transformers and VRs during reverse power flow. Corresponding methods are also disclosed. The various components of the present system, and the manner in which they interrelate, are more fully described hereinafter.