Ga Amsa na Iyakar Ƙarshen Harmunik don Makarantar Karkashin Dukkida: Ƙarshen Masu Yawan Harmunik a Farkon Karkashin Photovoltaic
Ⅰ. Scenario na iya ɗaya
Infushin daɗi mai karfi a harmonics daga kungiyar inverter na PV plant
A lokacin da ake yi aiki a cikin PV power plants masu yawan gaba, hanyoyi da inverter suka yi a cikin zama da suka yi watsa harmonics da ke ƙasar 150-2500Hz (yana da muhimmanci 23rd zuwa 49th harmonics), wanda ya haɗa da abubuwan da ake magance:
- Total Harmonic Distortion (THDi) ta shiga 12.3%, wanda ya fiye da ƙananan IEEE 519-2014.
- Yana haɗa da tashin bankin capacitor, tafakunsa, da kuma aiki a tashin alamomin ƙwayoyi.
- Yana ɗaukan Electromagnetic Interference (EMI) wanda ya haɗa da wuraren sauran kayan aiki masu mahimmanci.
II. Hukumomi na farko
Amfani da topologi na LC passive filter, taimakawa ƙwarewarsa da cikin ƙwarewar harminika da ingantaccen reactors + capacitor banks.
- Zabubu na mafi girma
|
Abu na zabu |
Model/Specification |
Funkar mai muhimmanci |
|
Dry-Type Iron-Core Series Reactor |
CKSC Type (Custom Design) |
Yana ba da inductive reactance mai ma'ana, wanda yake da tsari don harmonics da ke ƙasar. |
|
Filter Capacitor Bank |
BSMJ Type (Matched Selection) |
Yana faɗa da reactors don ƙwarewa harmonics da ke ƙasa. |
- Tsarin parametoru
Inductance na reactor: 0.5mH ±5% (@50Hz fundamental frequency)
Quality Factor (Q): >50 (Yana ba da high-frequency filtering da laifiya)
Insulation Class: Class H (Lokacin da ake yi aiki ta fiye da 180°C)
Reactance Ratio Configuration: 5.5% (An yi amfani da ita don 23rd-49th high-frequency band)
Topology Structure: Delta (Δ) Connection (Yana ƙara aiki na shunt da harmonics da ke ƙasar) - Abubuwa masu muhimmanci na tsarin ƙwarewar system
Kalkulaci na Resonant Frequency:
f_res = 1/(2π√(L·C)) = 2110Hz
Yana ƙara ƙwarewa da target frequency band (150-2500Hz), wanda yake ƙwarewa harmonics da ke ƙasar.
III. Tabbataccen ƙwarewa da ƙwarewar EMC
|
Alamar |
A kawo |
Ba da ƙwarewar |
Limit na Standard |
|
THDi |
12.3% |
3.8% |
≤5% (IEEE 519) |
|
Individual Harmonic Distortion |
Up to 8.2% |
≤1.5% |
Compliant with GB/T 14549 |
|
Capacitor Temperature Rise |
75K |
45K |
Compliant with IEC 60831 |
IV. Abubuwan da ake bukata kan a lokacin da ake yi aiki
- High-Efficiency Filtering:
An yi amfani da ƙwarewar 5.5% reactance ratio don tsari harmonics da ke ƙasa, wanda yake ƙara aiki na ƙwarewa ta 40% a matsayin ƙwarewar masu ƙasa na ƙasa zuwa 23rd order. - Safety and Reliability:
Class H temperature rise insulation system yana ba da aiki na zaɓu a cikin yankunan da ke da ƙarin da -40°C zuwa +65°C. - Cost Optimization:
Low-loss design (Q > 50) yana ba da aiki na zaɓu a cikin yankunan da ke da ƙarin da -40°C zuwa +65°C, wanda yake ƙara aiki na ƙwarewa ta 40% a matsayin ƙwarewar masu ƙasa na ƙasa zuwa 23rd order.
V. Koyar da take da ake bayar
- Ingantaccen lokacin da ake yi aiki: Low-voltage side busbar of the 35kV collection substation.
- Configuration: Each 2Mvar capacitor bank series-connected with 10 CKSC reactors (Group-based automatic switching).
- Monitoring Requirement: Install an online harmonic analyzer to track THDi changes in real-time.
Value na Solution: Yana ƙara ƙwarewa harmonics da ke ƙasa a cikin PV power stations, yana ƙara tsari da lokacin da ake yi aiki na capacitor zuwa 37%, da kuma yana ƙara ƙwarewa harmonics da ke ƙasa a cikin PV output curtailment.
