Asymmetric Current Equalizing Busbar for Wind Converters
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Solution Overview
Problem
Conventional busbar arrangements for wind energy converters either result in a poor current equalizing effect with a simple structure or a good effect with a complex, large, and costly design, complicating system design and installation.
Innovation Solution
A current equalizing busbar arrangement is designed with asymmetrical DC and AC busbars, where the parasitic inductances caused by the DC busbar and AC busbar between power modules are complementary, ensuring equal current distribution and facilitating system design with a simple structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If symmetrical AC and DC busbars are disposed to achieve good current equalizing, then current equalizing effect is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies asymmetry by designing the DC busbar with unequal lengths for different power modules. Specifically, the first DC busbar has a different length than the second DC busbar, creating intentional asymmetry in the layout. This asymmetric design allows the parasitic inductances to be complementary, achieving current equalization without requiring symmetrical AC and DC busbar configurations, thus reducing device complexity while maintaining reliability
2Reliability
If symmetrical busbar design is used to achieve good current equalizing, then current equalizing effect is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses asymmetric DC busbar lengths to achieve current equalization, where the first DC busbar connects to the first power module and the second DC busbar connects to the second power module with different lengths. This asymmetric configuration reduces the total amount of copper material required compared to symmetrical designs, lowering manufacturing costs while maintaining good current equalizing effect through complementary parasitic inductances
3Reliability
If symmetrical busbar arrangement is used to achieve good current equalizing, then current equalizing effect is improved, but installation difficulty increases
Solution Approach 1:
The asymmetric DC busbar design with different lengths simplifies installation by allowing flexible positioning and connection to power modules. The first DC busbar and second DC busbar can be installed at different positions and orientations, making the installation process more adaptable to different spatial constraints and easier to implement compared to rigid symmetrical arrangements
4Device complexity
If simple busbar structure is used, then device complexity is reduced, but current equalizing effect deteriorates
Solution Approach 1:
The patent applies local quality by optimizing the parasitic inductance characteristics of specific DC busbar segments. The first DC busbar and second DC busbar are designed with different lengths to create complementary parasitic inductances at critical locations. This localized optimization of inductance properties achieves good current equalizing effect while maintaining overall structural simplicity, avoiding the need for complex symmetrical arrangements
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 achieves a good current equalizing effect with high reliability, suitable for large power converters, and simplifies system design while maintaining effective current distribution among power modules.
Implementation Method 1
the parasitic inductances caused by the DC busbar and AC busbar between power modules are complementary, ensuring equal current distribution
Data Source
AI summary
The present application discloses a current equalizing busbar for a converter comprising: a direct current busbar connected to a DC terminal of the converter and positive terminals and negative terminals of respective power modules; and an alternate current busbar connected to AC terminals of the respective power modules and a load; wherein, when the converter operates, a sum of an inductance caused by the DC busbar between the DC terminal and a positive terminal or a negative terminal of a power module and an inductance caused by the AC busbar between the load and an AC terminal of the power module is equal to a sum of an inductance caused by the DC busbar between the DC terminal and positive terminals or negative terminals of other power modules and an inductance caused by the AC busbar between the load and AC terminals of said other power modules.