
Ⅰ. Application Scenario
Kapag ang 12-pulse rectifier units ay gumagana sa mga subway traction substations, naglilikha sila ng mga characteristic harmonics tulad ng 11th at 13th orders. Ito ay nagresulta sa excessive contact line voltage waveform distortion (na nakuha sa 8.5%), na nakakaapekto sa kalidad ng pagbibigay ng kuryente at seguridad ng mga rolling stock equipment.
II. Core Solution
Ilapat ang TKDG-type outdoor epoxy-cast air-core reactors upang makamit ang efficient harmonic absorption at system optimization.
III. Technical Highlights
- Innovative Reactor Design
- Vertical Stacked Winding Structure: Unikong spatial layout design na binabawasan ang footprint habang sinusigurado ang accuracy ng inductance, na sumasaklaw sa mga requirement ng compact substation space.
- 120°C Continuous Operation Capability: Ang proseso ng epoxy resin vacuum casting ay nagbibigay ng complete encapsulation insulation, na nagpapahintulot sa stable long-term operation sa ilalim ng natural air cooling sa mataas na temperatura. Ang maintenance-free cycle ay umabot sa 20 years.
- System-Level Harmonic Mitigation
- 24-Pulse Rectification Collaborative Mitigation: Ang mga reactors at rectifier units ay bumubuo ng isang buong mitigation unit:
▸ 12-pulse rectification → Naggagawa ng 11th/13th/23rd/25th harmonics.
▸ Upgrade to 24-pulse rectification → Inililipat ang 23rd/25th harmonics.
▸ TKDG Reactor → Partikular na nag-absorb ng residual 11th/13th characteristic harmonics.
- Key Performance Parameters
|
Indicator
|
Pre-Mitigation
|
Post-Mitigation
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Improvement Rate
|
|
Contact Line Voltage THD
|
8.5%
|
2.1%
|
75.3%
|
|
Characteristic Harmonic Content Rate
|
>5%
|
<0.8%
|
>84%
|
|
Continuous Operation Temp. Rise (°C)
|
-
|
≤70 K
|
-
|
IV. Implementation Benefits
- Enhanced Power Supply Safety: Ang Voltage THD ay sumasang-ayon sa requirement (≤4%) ng National Standard GB/T 14549-93 "Power Quality - Harmonics in Public Supply Network", na binabawasan ang panganib ng malfunction sa mga control systems ng locomotive.
- Energy Efficiency Optimization: Ang pagbabawas ng harmonic currents ay binabawasan ang line losses. Ang measured comprehensive energy efficiency ng traction system ay nabawasan ng 3%-5%.
- Space and Cost Advantages:
▸ Vertical structure na nagbabawas ng 30% installation area.
▸ Natural cooling design na nagbabawas ng 45% sa operation at maintenance costs kumpara sa forced-air cooling solutions.
V. Engineering Validation
- 11th harmonic current na ibinaba mula 312 A hanggang 58 A.
- 13th harmonic current na ibinaba mula 285 A hanggang 62 A.
- Ang failure rate ng capacitor banks at relay protection equipment ay ibinaba hanggang zero.
Summary of Solution Advantages: Nakakamit ang leap sa 12-pulse system power quality sa level ng 24-pulse system sa pamamagitan ng precise absorption ng characteristic harmonics gamit ang topology optimization, na nag-iwas sa pangangailangan ng capacity expansion retrofits.