Complete set of equipment for flexible ACDC interconnection of power distribution networks
The UNC-FIADA series, including UNC-FIADA-500-500 (500kVA/500kW) and UNC-FIADA-250-250 (250kVA/250kW), is a high-performance three-phase non-isolated converter engineered for industrial and commercial energy conversion applications. Both models feature a three-phase three-wire wiring configuration, 1.1× overload capacity for 10min (1.2× for 50s), and wide grid compatibility (400V ±15% Vac, 50/60Hz ±2.5Hz), with low harmonic distortion (≤3% THD) and adjustable power factor (0.5 leading to 0.9 lagging).
The DC side delivers 750Vdc (600-850V) output, with max currents of 918A (500kW) and 550A (250kW), and high regulation accuracy (≤±1% voltage, ≤±3% stability).
Built with IP54 protection, air cooling, and a -25~50℃ operating range (derating above 45℃), the series supports ModBusTCP/RTU/CAN2.0 communication, AC/DC self-powering, and emergency stop functionality, with compact dimensions (2200×2200×1400mm/2000×2200×1400mm) and weights of 2600kg/1800kg respectively.
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Product Description
UNC-FIADA Series Converters: High-Precision, Reliable Energy Conversion for Industrial Applications
The UNC-FIADA-500-500 and UNC-FIADA-250-250 converters represent a pinnacle of engineering in three-phase, non-isolated power conversion, designed to meet the rigorous demands of industrial, commercial, and utility-scale energy systems. Engineered for efficiency, durability, and adaptability, these converters deliver exceptional performance in grid integration, energy storage, and renewable energy applications, combining robust electrical specifications with user-centric design features to ensure seamless operation in diverse environments.
Core Electrical Performance: AC Side Excellence
Core Electrical Performance: AC Side Excellence
At the heart of the UNC-FIADA series is its outstanding AC-side performance, optimized for grid compatibility and power quality. The UNC-FIADA-500-500 offers a rated apparent power of 500kVA (matching its 500kW DC output), while the UNC-FIADA-250-250 scales to 250kVA/250kW—both tailored to handle medium-to-large load requirements in industrial settings such as manufacturing plants, data centers, and renewable energy farms.
Both models adopt a three-phase three-wire, non-isolated wiring configuration, a design choice that balances electrical efficiency with installation simplicity, eliminating the need for bulky isolation transformers and reducing overall system footprint. The overload capacity is a standout feature: 1.1 times the rated power for 10 minutes and 1.2 times for 50 seconds, ensuring the converters can handle short-term peak loads without tripping—a critical advantage in industrial environments where load fluctuations are common.
Grid compatibility is further enhanced by a wide operating range: the allowed grid voltage is 400V ±15% Vac, and the grid frequency tolerance is 50/60Hz ±2.5Hz. This flexibility allows the converters to adapt to regional grid variations and minor voltage/frequency fluctuations, ensuring stable operation even in less consistent grid environments. Power quality is maintained at the highest level, with total current harmonic distortion (THD) limited to ≤3% at rated power and voltage distortion factor ≤1% for linear loads—well below industry standards, which protects connected equipment from damage caused by harmonic interference and ensures compliance with global grid codes (e.g., IEC 61000).
The power factor is continuously adjustable from 0.5 leading to 0.9 lagging, giving users full control over reactive power management. This feature is invaluable for optimizing energy usage: leading power factor can compensate for capacitive loads (e.g., variable frequency drives), while lagging power factor addresses inductive loads (e.g., motors), reducing utility costs and improving overall grid stability.
Grid compatibility is further enhanced by a wide operating range: the allowed grid voltage is 400V ±15% Vac, and the grid frequency tolerance is 50/60Hz ±2.5Hz. This flexibility allows the converters to adapt to regional grid variations and minor voltage/frequency fluctuations, ensuring stable operation even in less consistent grid environments. Power quality is maintained at the highest level, with total current harmonic distortion (THD) limited to ≤3% at rated power and voltage distortion factor ≤1% for linear loads—well below industry standards, which protects connected equipment from damage caused by harmonic interference and ensures compliance with global grid codes (e.g., IEC 61000).
The power factor is continuously adjustable from 0.5 leading to 0.9 lagging, giving users full control over reactive power management. This feature is invaluable for optimizing energy usage: leading power factor can compensate for capacitive loads (e.g., variable frequency drives), while lagging power factor addresses inductive loads (e.g., motors), reducing utility costs and improving overall grid stability.
Product Parameters
UNC-FIADA Series Converter Technical Specifications | ||
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Parameter |
UNC-FIADA-500-500 |
UNC-FIADA-250-250 |
AC Side |
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|
Apparent Power |
500kVA |
250kVA |
Wiring Method |
Three-phase Three-wire, Non-isolated |
Three-phase Three-wire, Non-isolated |
Output Overload Capacity |
1.1 times for 10min, 1.2 times for 50s |
1.1 times for 10min, 1.2 times for 50s |
Allowed Grid Voltage |
400V ±15% Vac |
400V ±15% Vac |
Allowed Grid Frequency |
50/60Hz ±2.5Hz |
50/60Hz ±2.5Hz |
Total Current Harmonic Distortion |
≤3% (Rated Power) |
≤3% (Rated Power) |
Voltage Distortion Factor |
≤1% (Linear Load) |
≤1% (Linear Load) |
Power Factor |
0.5 leading ~ 0.9 lagging, Continuously Adjustable |
0.5 leading ~ 0.9 lagging, Continuously Adjustable |
DC Side |
|
|
Rated Output Power |
500kW |
250kW |
DC Voltage Output Range |
Rated Voltage 750Vdc (600-850) |
Rated Voltage 750Vdc (600-850) |
Max Output Current |
918A |
550A |
Voltage Regulation Accuracy |
≤±1% |
≤±1% |
Stability Accuracy |
≤±3% (Rated Power) |
≤±3% (Rated Power) |
System Parameters |
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|
Dimensions (W×H×D, mm) |
2200*2200*1400mm |
2000*2200*1400mm |
Weight |
2600kg |
1800kg |
Protection Grade |
IP54 |
IP54 |
Allowed Ambient Temperature |
-25~50℃ (Derating above 45℃) |
-25~50℃ (Derating above 45℃) |
Cooling Method |
Air Cooling |
Air Cooling |
Allowed Relative Humidity |
0-95% (No Condensation) |
0-95% (No Condensation) |
Allowed Altitude |
3000m (Derating above 2000m) |
3000m (Derating above 2000m) |
Emergency Stop |
Yes |
Yes |
Display & Communication |
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Display |
Touch Screen |
Touch Screen |
Communication Interface |
ModBusTCP/RTU, CAN2.0 |
ModBusTCP/RTU, CAN2.0 |
Control Circuit Power Supply |
AC/DC Self-powered |
AC/DC Self-powered |
DC Side Performance: Precision and Power Delivery
The DC side of the UNC-FIADA series is engineered for high-precision power delivery, a key requirement for energy storage systems and renewable energy integration (e.g., solar PV or wind farms). Both models feature a DC output voltage range centered at 750Vdc (600-850V), a voltage level widely adopted in medium-voltage energy storage systems for optimal energy transfer efficiency.
The maximum output current is scaled to match power ratings: 918A for the 500kW model and 550A for the 250kW variant, ensuring sufficient current delivery to charge/discharge battery banks or power DC loads. Voltage regulation accuracy is ≤±1%, and stability accuracy ≤±3% at rated power—these tight tolerances ensure consistent DC voltage output even as load conditions change, critical for protecting lithium-ion battery systems (the most common energy storage technology) from overvoltage/undervoltage damage and maximizing battery lifespan.
System Design: Durability and Environmental Adaptability
System Design: Durability and Environmental Adaptability
The UNC-FIADA series is built to withstand harsh industrial environments, with a focus on durability and ease of maintenance. The protection grade is IP54, meaning the converters are dust-tight and protected against water splashes from any direction—suitable for installation in semi-outdoor enclosures or industrial halls with high dust levels, eliminating the need for expensive climate-controlled rooms.
The operating temperature range is -25℃ to 50℃ (with derating above 45℃), allowing deployment in extreme climates—from cold northern regions to hot, arid industrial zones. A forced air cooling system ensures thermal stability, with fans that adjust speed based on internal temperature to balance cooling efficiency and noise levels. The allowed relative humidity is 0-95% (non-condensing), and the maximum operating altitude is 3000m (with derating above 2000m), further expanding the converters’ applicability to high-altitude locations such as mountainous renewable energy installations.
Physical dimensions are optimized for space efficiency: the UNC-FIADA-500-500 measures 2200×2200×1400mm (W×H×D) and weighs 2600kg, while the 250kW model is slightly compact (2000×2200×1400mm, 1800kg). These dimensions balance power density with ease of transportation and installation—critical for retrofitting existing industrial facilities or building new energy systems in space-constrained areas. An emergency stop function is included as standard, providing an additional layer of safety for operators and maintenance personnel.
Connectivity and User Experience
The UNC-FIADA series prioritizes ease of integration and monitoring, with a suite of communication and control features designed for industrial automation. A touchscreen display provides real-time visibility into key parameters (e.g., input/output voltage/current, temperature, fault codes), allowing on-site operators to quickly diagnose issues and adjust settings.
For remote monitoring and control, the converters support ModBusTCP/RTU and CAN2.0 communication protocols—industry standards for industrial automation. This enables seamless integration with building management systems (BMS), energy management software (EMS), and SCADA systems, allowing users to monitor performance, schedule operations (e.g., peak shaving), and receive alerts for maintenance or faults from a central control room. The control circuit is self-powered by AC/DC, eliminating the need for an external power supply and ensuring continuous operation even if the main grid fails (critical for backup power applications).
Applications and Value Proposition
The UNC-FIADA-500-500 and UNC-FIADA-250-250 converters are versatile solutions for a range of applications:
Energy Storage Systems (ESS): Ideal for grid-scale or industrial ESS, enabling peak shaving (reducing high-demand charges), load shifting (storing energy during off-peak hours), and backup power during grid outages.
Renewable Energy Integration: Converts DC power from solar PV or wind turbines to grid-compliant AC power, maximizing the utilization of clean energy and reducing reliance on fossil fuels.
Industrial Power Quality Improvement: Mitigates harmonic distortion and optimizes power factor for manufacturing facilities, reducing energy waste and extending equipment lifespan.
Microgrid Operations: Provides stable power conversion in off-grid or hybrid microgrids (e.g., remote mining sites or rural communities), ensuring reliable power delivery.
What sets the UNC-FIADA series apart is its balance of performance, durability, and flexibility. The high-precision voltage/current regulation, wide environmental tolerance, and robust communication features make it a cost-effective long-term investment, while the scalable power ratings (250kW/500kW) allow users to match converter capacity to their specific energy needs—whether for small commercial applications or large industrial projects.
Conclusion
The UNC-FIADA-500-500 and UNC-FIADA-250-250 converters are more than just power conversion devices—they are integral components of modern energy systems, designed to enhance efficiency, reliability, and sustainability. With industry-leading power quality, wide environmental adaptability, and seamless integration capabilities, these converters meet the evolving needs of industrial and commercial users, supporting the transition to cleaner, more efficient energy management. Whether used for energy storage, renewable integration, or power quality improvement, the UNC-FIADA series delivers consistent, high-performance operation that ensures long-term value and operational peace of mind.
