Inter-phase Transformer Limits Circulating Current in Parallel Converters
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Solution Overview
Problem
High-power wind energy generators face challenges in satisfying operational requirements due to circulating currents generated in parallel converter structures, which negatively affect efficiency.
Innovation Solution
A converter system is designed with inter-phase transformers to limit circulating currents between converters connected in parallel, maintaining system efficiency by using a configuration of bridge arms and transformer units that neutralize magnetic fields and utilize inductance to restrain currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If converters are connected in parallel to generate higher current and power, then the operational requirements of high-power wind energy generator are satisfied, but circulating current is generated which negatively affects converter system efficiency
Solution Approach 1:
An inter-phase transformer is introduced as an intermediary component between parallel-connected converters. The transformer couples the converters through its windings, allowing power transmission while the transformer's inductance limits circulating currents. This mediator enables both high power output through parallel connection and efficiency maintenance by restraining harmful circulating currents.
2Productivity
If multiple converters are connected in parallel to meet high-power demands, then the current and power generation capability is increased, but circulating current generates harmful effects on the system
Solution Approach 1:
The inter-phase transformer serves as a mediating component that couples parallel converters while restraining circulating currents through its inductive properties. The transformer windings create magnetic coupling that allows high current capability while the inherent inductance opposes rapid current changes, thereby limiting circulating current effects.
Solution Approach 2:
The inter-phase transformer changes the electrical parameters between parallel converters by introducing inductive coupling. This parameter change transforms the direct parallel connection into an inductively-coupled parallel connection, maintaining current generation capability while adding current-limiting characteristics through the transformer's inductance.
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
The solution effectively limits circulating currents, ensuring the converter system's efficiency and preventing damage when connecting multiple converters in parallel to meet high-power wind energy generator demands.
Implementation Method 1
The first inter-phase transformer is disposed at the first input side parallel terminal or the first output side parallel terminal for limiting a circulating current generated by the first converter and the second converter
Data Source
AI summary
A converter system includes a first converter, a second converter, and a first inter-phase transformer. The first converter is electrically connected to the second converter in parallel between a first input terminal parallel end and a first output terminal parallel end. The first inter-phase transformer is disposed at the first input side parallel terminal or the first output side parallel terminal, and the first inter-phase transformer is operable to restrain a circulating current generated by the first converter and the second converter.