Self-Balancing High Current Voltage-Source Converter
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Solution Overview
Problem
High current Voltage-Source Converters (VSCs) face challenges in maintaining balanced current flows when multiple inverter valve units are connected in parallel, leading to excessive currents and unwanted AC harmonics, which can damage components and increase costs due to the need for precise component matching and active control systems.
Innovation Solution
A self-balancing circuit using paralleling conductors with low impedance connects multiple inverter valve units in parallel, equalizing current flows and reducing excessive currents and AC harmonics, thereby simplifying control and reducing component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple inverter valve units are connected in parallel to achieve high current operation, then current capacity is improved, but current balance and harmonic distortion worsen
Solution Approach 1:
A current balancing circuit is introduced as an intermediary component between the parallel-connected inverter valve units. This circuit includes balancing resistors connected in series with each inverter valve unit's output, and a controlling switch that regulates current distribution. The balancing circuit acts as a mediator to equalize current flows among parallel units, preventing current imbalance and reducing AC harmonics while maintaining high current capacity operation.
2Reliability
If active control systems and precise component matching are used to maintain current balance, then current balance is improved, but device complexity and cost increase
Solution Approach 1:
The current balancing circuit is designed to automatically equalize current distribution among parallel inverter valve units without requiring external active control systems. The balancing resistors and controlling switches form a self-regulating mechanism that passively adjusts current flows based on inherent circuit characteristics, eliminating the need for complex control algorithms, sensors, and precise component matching while maintaining reliable current balance.
Data Source
AI summary
A voltage source converter has a first inverter valve unit that has a first terminal and a second terminal, and a second inverter valve unit that has a first terminal and a second terminal. The first inverter valve unit and the second inverter valve unit are connectedly arranged in parallel. The first inverter valve unit and the second inverter valve unit are self-balancing through equal capacitance and parallel connection of the first inverter valve unit and the second valve unit.