Controlled Switching Device Overvoltage Suppression Lookup Table
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Solution Overview
Problem
Conventional controlled switching devices require complex calculations and high-performance arithmetic units to determine the target closing time for suppressing overvoltage during transmission line switching, leading to increased costs.
Innovation Solution
A controlled switching device that generates a target closing phase map considering pre-arc characteristics and mechanical variations, allowing for simple calculations and high-speed control using a target closing time string, which is calculated based on power source and load voltage frequencies and phases, enabling efficient suppression of overvoltage during transmission line switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex calculations are performed to determine target closing time using functional approximation and signal conversion, then overvoltage suppression is achieved, but device complexity and cost increase due to requirement for high-performance arithmetic unit
Solution Approach 1:
The patent pre-calculates and stores target closing phase information in a lookup table during the design phase, considering various combinations of power source voltage phase, load voltage phase, and load voltage amplitude. During operation, the controller simply queries this pre-computed table with current voltage parameters to obtain the target closing phase, eliminating the need for complex real-time calculations while maintaining overvoltage suppression effectiveness
Solution Approach 2:
The patent creates a simplified representation of the complex closing time determination problem by storing pre-computed solutions in a lookup table. Instead of performing complex functional approximation and signal conversion calculations in real-time, the system copies the essential relationship between voltage parameters and optimal closing phases into a data structure that can be quickly queried, replacing computational complexity with data storage and retrieval
2Reliability
If complex calculations are performed to determine target closing time, then accurate overvoltage suppression is achieved, but calculation time increases reducing control speed
Solution Approach 1:
The patent pre-calculates and stores target closing phase information in a lookup table during the design phase, considering various combinations of power source voltage phase, load voltage phase, and load voltage amplitude. During operation, the controller simply queries this pre-computed table with current voltage parameters to obtain the target closing phase, eliminating the need for complex real-time calculations while maintaining overvoltage suppression effectiveness
Solution Approach 2:
The patent replaces expensive, complex computational processes with a simple, inexpensive lookup table that can be quickly queried. The pre-computed data structure serves as a lightweight, fast-access resource that provides accurate target closing phase information without requiring high-performance arithmetic units or lengthy calculation times
Data Source
AI summary
A target-closing phase-map generating section generates in advance a target closing phase map in consideration of a pre-arc characteristic and variations of a mechanical action of a breaker, and amplitude fluctuations of the load voltage. A target-closing time calculating section calculates a target closing time string from frequencies and phases of the power source voltage and the load voltage, respectively, of the breaker referring to the target closing phase map. A closing control section, when a close command 11 is inputted, controls the timing of outputting a closing control signal based on a predicted closing time and the target closing time string.