Intelligent na High Voltage Outdoor Disconnector Solution para sa mga Distributed PV ug Storage Projects sa Vietnam
1. Konteksto sa Proyekto
Ang mga proyekto sa distributibong photovoltaic (PV) ug energy storage nagdala og radyo nga pag-abot sa Vietnam ug Southeast Asia, apan naghahadlok sa mga seriyosong hamubo:
1.1 Kabag-oan sa Grid:
- Ang grid sa Vietnam adunay paborito nga pagbag-o (espesyalmente sa northern industrial zones). Sa 2023, ang kahimtang sa coal power shortage mihimong kasagaran nga blackout, resulta sa daily losses nga mas dako pa sa USD 5 million.
- Ang tradisyonal nga PV systems walay rapid isolation capability, makapatog sa equipment damage ug safety incidents sa panahon sa grid faults. Kini nagpakita sa critical nga panginahanglan alang sa reliable nga High voltage Disconnect Switch.
1.2 Pressure sa Pagsumala sa Policy ug Safety:
- Ang bag-ong regulasyon sa Vietnam sa 2024 nagmangha nga ang energy storage systems mobag-o sa EVN (Vietnam Electricity Group)'s 72-hour islanding operation test ug adunay high-voltage ride-through (HVRT) capability.
- Ang high-voltage risks sa DC side prominente; ang arc faults (uban sa instantaneous temperature nga nakit-an sa 1000°C) makapaton sa sunog. Ang robust nga High voltage Disconnect Switch importante para mapasabot kini nga DC-side risks.
1.3 Mga Panginahanglan sa Environmental Adaptability:
- Ang high temperature ug humidity climates (average annual humidity >80%) mag-accelerate sa aging sa equipment, nagmangha sa disconnecting switches nga adunay strong anti-corrosion ug moisture-proof performance. Ang High voltage Disconnect Switch kinahanglan mobag-o sa stringent nga environmental demands.
2. Solusyon: Intelligent High-Voltage Disconnecting Switch System
2.1 Core Technology Design
- Three-Position High voltage Disconnect Switch (Open-Closed-Grounded):
Ginamit ang double-break rotary structure, rated voltage ≥15kV, rated current 6300A (forced air-cooling design), mogamit sa needs sa large-scale distributed power plants.
Arc Extinguishing Optimization:Equipado uban sa built-in magnetic blowout arc extinguishing devices, DC arc breaking time ≤20ms, preventing arc faults from causing fires. Kini nga rapid arc extinction usa ka key safety feature sa High voltage Disconnect Switch.
- Environmental Adaptability Enhancement:
Ang enclosure adunay IP65 protection rating; ang core components silver-plated aron molukso sa salt spray corrosion (compliant sa IEC 60068-2-52 standard). Kini nga protections ensure the long-term reliability of the High voltage Disconnect Switch.
Thermal Design:Idugang ang aluminum alloy heat sinks, temperature rise controlled at ≤40K (in 40°C ambient). Effective thermal management is vital for the High voltage Disconnect Switch in tropical climates.
2.2 Intelligent Monitoring and Protection System
- Integrated Sensor Module:
Real-time monitoring sa contact temperature, arc signals, ug insulation status; data synchronized sa local SCADA ug cloud platforms (e.g., Hoymiles S-miles Cloud) within milliseconds. Continuous monitoring enhances the safety profile of the High voltage Disconnect Switch.
- Protection Logic Coordination:
Collaboration with Circuit Breakers:Automatically opens within 10 seconds upon detecting grid voltage drop to 20% UN (meeting Vietnam's low-voltage lockout requirement).
Cooperation with AFCI (Arc Fault Circuit Interrupter) System:Cuts off the fault circuit within 0.5 seconds. This fast protection logic integrates seamlessly with the High voltage Disconnect Switch.
2.3 Localized Adaptation Improvements
- Grid Compliance:
Supports EVN-required islanding test mode, simulating seamless switch to energy storage supply after grid interruption. The High voltage Disconnect Switch is integral to passing this critical test.
Pre-installed sealing wire interfaces to meet Vietnam's mandatory metering room sealing requirements.
- Maintenance Convenience:
Contact lifespan ≥10,000 operations; maintenance cycle extended to 5 years, reducing O&M costs in tropical regions. The durability of the High voltage Disconnect Switch significantly lowers lifetime costs.
3. Nakamit nga Resulta
3.1 Enhanced Safety and Reliability
- Achieves off-grid switching within 10ms during grid faults (exceeding Vietnam's 50ms standard), ensuring continuous operation of critical loads (e.g., factory production lines). This rapid isolation is enabled by the High voltage Disconnect Switch.
- After deployment in a 2024 Hanoi villa project, DC-side fire risk decreased by 90%, and electric shock incidents were eliminated.
3.2 Economic Benefits and Compliance
- Reduced Penalty Risk:Meets carbon emission requirements of the "Green Industry Act," avoiding annual revenue fines of 3%.
- Shortened Payback Period:Due to reduced maintenance costs (down 30%) and decreased downtime losses, IRR increased by 2-3 percentage points.
3.3 Strengthened Grid Support Capability
Passed dynamic curtailment clause testing: Supports power regulation of up to 30% installed capacity under EVN's flexible dispatch (when grid load <75%), enabling power plants to participate in the Frequency Regulation Market (FRP). The High voltage Disconnect Switch contributes to this grid support functionality.
