Contactless Power Transmission Compensation for Line Reactance Stability
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Solution Overview
Problem
Existing power transmission systems face challenges in effectively suppressing the reactance component of impedance in transmission lines, which is influenced by the shape and environment, leading to inefficiencies and the need for large capacitors to cancel out inductive reactance.
Innovation Solution
Incorporating an inductive reactance element with a greater inductive reactance than the transmission line, connected in series with a capacitor, to reduce the overall inductive reactance and minimize the required capacitance needed to achieve resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is provided to suppress the reactance component of impedance of the transmission line, then the output current from the power reception apparatus is improved, but a large capacitor is required which increases device complexity and cost
Solution Approach 1:
The patent divides the compensation function into two segments: a first capacitor connected in series with the transmission line to provide primary reactance suppression, and a second capacitor connected in parallel to the series combination to provide additional compensation. This segmentation allows each capacitor to be smaller than a single large capacitor would need to be, reducing device complexity while maintaining output current stability.
Solution Approach 2:
The patent transitions from a single-dimensional compensation approach (one capacitor) to a two-dimensional approach by adding both series and parallel capacitor connections. This dimensional change in the circuit topology enables more effective reactance suppression with smaller individual capacitor values, resolving the contradiction between reliability and device complexity.
2Adaptability or versatility
If the shape of the transmission line changes, then the inductive reactance changes, but this causes instability in power transmission
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring both series and parallel capacitors to counteract the inductive reactance of the transmission line before power transmission begins. This preliminary compensation arrangement ensures that even when the transmission line shape changes and inductive reactance varies, the system maintains stable power transmission because the capacitive reactance is already positioned to offset the inductive effects.
Solution Approach 2:
The compensation circuit is configured in advance with both series and parallel capacitors connected in a specific topology before operation. This preliminary action establishes a fixed compensative relationship that remains effective regardless of subsequent changes in transmission line geometry, thereby maintaining inductive reactance consistency despite physical flexibility.
3Ease of manufacture
If only a single capacitor is used to cancel inductive reactance, then the circuit is simple, but large capacitance values are required which are difficult to implement
Solution Approach 1:
The total capacitance requirement is segmented into two separate capacitors: a first capacitor in series and a second capacitor in parallel. This segmentation allows each capacitor to have a smaller, more practical capacitance value that is easier to manufacture and implement, while collectively providing the same or better compensation effect than a single large capacitor would require.
Solution Approach 2:
The patent merges the compensation functions of two capacitors with different connection topologies (series and parallel) to achieve the overall compensation effect. This combining approach distributes the total capacitance requirement across two components, making each individually easier to manufacture while maintaining the quantitative compensation needed for the transmission line.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for stable power transmission by ignoring changes in inductive reactance due to transmission line shape variations, reducing capacitance requirements and maintaining consistent voltage levels.
Implementation Method 1
a capacitor that reduces an inductive reactance that is a sum of the inductive reactance of the transmission line and the inductive reactance of the inductive reactance element
Implementation Method 2
minimize the required capacitance needed to achieve resonance
Implementation Method 3
a power transmission unit that has a power transmission coil and a capacitor that is connected to the power transmission coil
Data Source
AI summary
A power transmission apparatus supplies power to a power reception apparatus without contact therebetween. The power transmission apparatus includes: a power conversion unit that outputs an alternating-current voltage of a predetermined frequency; a power transmission unit that has a power transmission coil and a capacitor that is connected to the power transmission coil; a transmission line that connects the power conversion unit and the power transmission unit; and a compensator that is disposed between the power conversion unit and the transmission line. The compensator includes: an inductive reactance element that has an inductive reactance that is greater than an inductive reactance of the transmission line; and a capacitor that reduces an inductive reactance that is a sum of an inductive reactance of the transmission line and an inductive reactance of the inductive reactance element. The inductive reactance element and the capacitor are connected.