Solusyon sa Pagbawas ng Harmonics para sa mga Bagong Ilog ng Kapangyarihan: Komprehensibong Pamamahala ng Mataas na Prensiyang Harmonics sa Mga Implantasyon ng Solar Power
Ⅰ. Scenario sa Problema
Pag-inject og mataas nga frequency harmonics gikan sa cluster sa inverter sa PV plant
Sa operasyon sa malambot nga centralized PV power plants, ang daghang inverter nga nagsugyot parehas nag-generate og wide-band harmonics sa rango sa 150-2500Hz (primarily ang 23rd hangtod sa 49th harmonics), resulta sa sumala sa mga problema sa grid-side:
- Total Harmonic Distortion sa Kuryente (THDi) naabot sa 12.3%, mas taas kaayo kaysa sa limitahan sa IEEE 519-2014 standard.
- Pag-overload sa capacitor bank, pag-init, ug malihok sa protective device.
- Padayon nga Electromagnetic Interference (EMI) nga nakaapekto sa mga sensitive equipment sa kalibutan.
II. Core Solution
Pag-adopt sa LC passive filter topology, pagbana og efficient harmonic absorption circuits gamit ang customized reactors + capacitor banks.
- Pili sa Key Equipment
|
Klase sa Equipment |
Model/Specification |
Core Function |
|
Dry-Type Iron-Core Series Reactor |
CKSC Type (Custom Design) |
Naghatag og precise inductive reactance, suppressing high-frequency harmonics. |
|
Filter Capacitor Bank |
BSMJ Type (Matched Selection) |
Resonates uban sa reactors aron moadto sa specific harmonic bands. |
- Technical Parameter Design
Reactor Inductance: 0.5mH ±5% (@50Hz fundamental frequency)
Quality Factor (Q): >50 (Nag-siguro sa low-loss high-frequency filtering)
Insulation Class: Class H (Long-term withstand temperature 180°C)
Reactance Ratio Configuration: 5.5% (Optimized for 23rd-49th high-frequency band)
Topology Structure: Delta (Δ) Connection (Enhances high-order harmonic shunting capability) - Key Points sa Filter System Design
Calculation sa Resonant Frequency:
f_res = 1/(2π√(L·C)) = 2110Hz
Accurately covers the target frequency band (150-2500Hz), achieving local absorption of high-frequency harmonics.
III. Validation sa EMC Mitigation Effectiveness
|
Indicator |
Bago ang Mitigation |
Humanay sa Mitigation |
Standard Limit |
|
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. Advantages sa Engineering Implementation
- High-Efficiency Filtering:
Ang 5.5% reactance ratio design specifically suppresses harmonics above the 23rd order, providing a 40% improvement in high-frequency response compared to traditional 7% schemes. - Safety and Reliability:
The Class H temperature rise insulation system ensures stable equipment operation in outdoor environments ranging from -40°C to +65°C. - Cost Optimization:
The low-loss design (Q > 50) results in additional system power consumption of < 0.3% of output power.
V. Recommendations sa Deployment
- Installation Location: 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.
Solution Value: Effectively resolves high-frequency harmonic pollution in new energy power stations, extends capacitor lifespan by over 37%, and avoids PV output curtailment due to harmonic violation penalties.
