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Power Capacitors
- BY71 Series Cylindrical Capacitor
- BSMJ Series Self-healing Low Voltage Shunt Capacitors
- BY86 Series Controlled Intelligent Capacitor
- BYKXG/F Series Anti-harmonic Intelligent Capacitor
- BY81 Series Intelligent Capacitor
- BY82J Series Anti-harmonic Intelligent Capacitor
- BY89 Series Intelligent Capacitor
- Intelligent Controller Series
- Reactor
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- Alternating Current Contactor
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- APF/SVG/SPC Cabinet & Module Series
BY91-APF/100A-0.4/4L-B Series Low Voltage Active Harmonic Filter (AHF) 4-Three-phase Four-wire Apf 400V Active Harmonic Filter Power Factor Correction Har
Model Meaning
Main Datas of BY91-APF/100A-0.4/4L-B Active Harmonic Filter
| Model | BY91-APF/100A-0.4/4L-B | |
| System Specification | Rated Line Voltage | AC400+20% |
| Electrical Wiring | Three phase three wire/three phase four wire | |
| Take Electric Wires | C-phase line/DC bus (customizable) | |
| Grid Frequency | 50Hz/60Hz | |
| Circuit Topology | Three phase three-level | |
| Full Response Time | Compensated reactive power:<5ms; Full compensation: <15ms-1~1 adjustable | |
| Reactive Power Compensation | -1~1 adjustable | |
| Correcion Rate of 3-phase Imbalance | 100% | |
| Harmonic Filtering rate | >97% | |
| Overall Efficiency | >97.5% | |
| Switching Frequency | 50kHz | |
| Cooling Method | Intelligent air cooling/forced air cooling/T-type natural air | |
| Noise | <60dB@1m/<50dB@1m(T-shaped) | |
| Installation Method | Module, rack, cabinet, wall mounted, box mounted | |
| Exterior | Colour | Aluminum zinc coated board, white, black, gold primary colors, etc. (customizable) |
| Communication Interface | RS-232,RS485 bus (optional Ethernet, WLAN, USB2.0) | |
| Communication Protocl | Modbus protocol | |
| Fault Alarm | Have | |
| Background Monitoring | Optional GPRS remote monitoring; Optional Bluetooth and NFC installed in the module | |
| On Site Display | 7-inch Chinese color touch screen (optional) | |
| Display current, voltage, three-phase power, power factor, harmonic content, etc | ||
| Environmental Requirements | Temperature | -20℃~+50℃ |
| Relative Humidity | Not exceed 90% RH without condensation | |
| Installation Altitude | Not exceed 2000m rated capacity, greater than 2000m reduced capacity operation | |
Introduction of BY91-APF/100A-0.4/4L-B Active Harmonic Filter
Main Features of BY91-APF/100A-0.4/4L-B Active Harmonic Filter
1. Advanced harmonic elimination and three-phase four-wire support
The BY91-APF/100A-0.4/4L-B series uses real-time harmonic elimination technology to neutralize 2nd to 50th harmonics with an accuracy of up to ≥95%, effectively solving distortion caused by non-linear loads such as inverters and UPS systems. Designed for three-phase four-wire systems, this series uniquely solves the third harmonics (3rd, 9th, 27th) in the neutral line to prevent overheating and fire risks. This active harmonic filter uses an IGBT-based inverter and an adaptive algorithm to inject reverse current in ≤10 ms to eliminate harmonic pollution, ensuring compliance with IEEE 519 and GB/T 14549 standards. It is ideal for data centers, hospitals, and manufacturing plants, and can significantly improve power quality reliability.
2. Dynamic reactive power compensation and power factor correction
In addition to harmonic management, the active power filter provides dynamic reactive power compensation to stabilize grid voltage and improve power factor to ≥0.96. It automatically adjusts capacitive/inductive reactive output within ≤1 cycle to resolve undervoltage or penalty issues caused by lagging/leading current. Unlike passive LC filters, it avoids the risk of resonance with grid impedance while compensating fundamental reactive power. This dual functionality – harmonic elimination + reactive power support – reduces transformer losses by 8-12% and eliminates capacitor bank failures, providing a cost-effective alternative to standalone SVG/SVC systems.
3. Real-time three-phase unbalance compensation
This active high frequency filter (AHF) solves the voltage sag/swell problem caused by uneven load and provides independent three-phase imbalance compensation for each phase. By dynamically injecting corrective current into each phase (+ neutral), it can balance the phase voltage/current within 10 milliseconds, thereby minimizing neutral overload and equipment vibration. It integrates an intelligent control algorithm that continuously monitors the load fluctuation of the low-voltage grid (400V ±15%) and automatically adjusts the compensation strategy. This feature is critical for facilities with predominantly single-phase loads (e.g. commercial lighting, IT servers), which can extend motor life and reduce energy waste by 5-10%.
4. AI-driven intelligent control and multi-device coordination
The harmonic filter uses a DSP+FPGA digital core and a 7-inch touchscreen human-machine interface (HMI) to achieve intelligent control through real-time analysis. It automatically tracks the harmonic spectrum, diagnoses power quality issues (THDi, THDu, PF), and supports customizable compensation modes (harmonics only, reactive power only, or mixed). It is equipped with RS485/CAN/Modbus interfaces and can achieve parallel expansion of ≤10 units for scalable harmonic management. Embedded cloud IoT capabilities enable remote tuning, fault alarms, and predictive maintenance, reducing operating costs by 20%.
5. Comprehensive system protection and resilience
Designed for harsh industrial environments, this AHF integrates multiple layers of protection: overvoltage/undervoltage (up to 480V), overload/overtemperature (≤45°C), and short-circuit fault protection. Its LCL output topology suppresses high-frequency ripple (>150 kHz) to prevent interference with sensitive equipment. The IP20-rated (upgradable to IP54) housing ensures dust/moisture resistance, while the active harmonic filtering algorithm automatically suppresses grid resonances and protects capacitors and transformers from harmonic-induced damage. Ideal for steel mills, ports, and renewable energy, this product can extend equipment life by 30%.
6. Energy efficiency and ROI optimization
This harmonic filter can bring tangible energy savings: reducing line losses by 15-25%, recovering 20% of transformer capacity, and reducing electricity bills through power factor correction. In areas with high electricity prices, the average payback period is 3-6 months, and harmonic-free operation can avoid fines from power companies. Compatible with solar/wind hybrid systems, the filter can reduce harmonics in the inverter power supply and ensure the integration of green energy. As an all-in-one solution for harmonic elimination, reactive power compensation and phase balancing, it outperforms traditional isolated solutions - with efficiency up to 97.3% and current distortion rate ≤3%.
Operation Principle of BY91-APF/100A-0.4/4L-B Active Harmonic Filter
The core technology of BY91-APF/100A-0.4/4L-B is real-time harmonic detection and dynamic compensation to eliminate harmonic current. External current transformers (CTs) continuously monitor the load current and transmit the data to a DSP-based intelligent control system. The system uses Fast Fourier Transform (FFT) to analyze the harmonic components (2nd to 50th) and calculate the precise reverse compensation current required to eliminate distortion.The filter utilizes an IGBT-based PWM inverter to generate compensation current at a switching frequency of up to 20kHz, ensuring millisecond response time and seamless integration with non-linear loads such as variable frequency drives (VFDs) and rectifiers. A negative feedback loop further optimizes the entire process, maintaining >92% harmonic compensation efficiency while adapting to fluctuating load conditions.
Size Informations of BY91-APF/100A-0.4/4L-B Active Harmonic Filter
Why choose Baoyu?
1. Advanced intelligent control system, precise harmonic suppression
The BY91-APF/100A-0.4/4L-B series integrates an advanced intelligent control system driven by a high-speed digital signal processor (DSP) and field programmable gate array (FPGA) architecture, setting a new benchmark for active harmonic filter technology. This powerful control core can monitor the three-phase four-wire power system in real time and instantly analyze harmonic distortion, three-phase imbalance and reactive power fluctuations. The system uses complex algorithms to dynamically generate compensation currents to neutralize up to 50th harmonic components, ensuring rapid elimination of harmonics and accurate correction of power factor.The intelligent control module has an adaptive learning function that continuously optimizes the compensation strategy according to the changing load curve. This ensures that the system can maintain consistent performance in a variety of industrial environments, from manufacturing plants with non-linear loads to commercial buildings with fluctuating power demand. The system's real-time data processing function can control the response time within microseconds, which is significantly better than traditional passive filters. Through integrated intelligent control, APF can effectively solve the problem of three-phase unbalanced compensation, maintain phase current balance and reduce neutral line overload. This not only improves the overall power quality, but also minimizes power loss, thereby significantly saving customers operating costs. The intuitive human-machine interface (HMI) further enables seamless monitoring and configuration, making harmonic control a simplified process for power system managers.
2. Powerful three-phase four-wire architecture for comprehensive power quality management
The BY91-APF/100A-0.4/4L-B series is designed for three-phase four-wire systems, and its professional architecture can effectively deal with the complex power quality challenges inherent in such configurations. The three-phase four-wire design enables the active harmonic filter to simultaneously handle harmonic currents, reactive power issues, and three-phase load imbalance, providing a full range of solutions for industrial and commercial applications. The architecture enables the APF to inject compensating current into each phase and the neutral line, effectively eliminating harmonic distortion and balancing phase loads.The system's four-wire configuration is particularly beneficial in situations where single-phase non-linear loads, such as LED lighting, variable frequency drives, and IT equipment, cause severe distortion in the neutral current. By directly controlling the harmonic current in the neutral line, APF reduces the risk of overheating and improves the reliability of downstream electrical equipment. In addition, the three-phase, four-wire design optimizes reactive power compensation and improves the power factor to close to 1. This not only meets the requirements of utility companies, but also reduces fines due to low power factor, while improving the efficiency of transformers and distribution systems. The modular design of the architecture is easy to expand, enabling seamless integration into existing three-phase, four-wire networks and adapting to growing load demands.
3. High-quality components and thermal management for sustained high performance
The BY91-APF/100A-0.4/4L-B series features top-of-the-line electronic components and an innovative thermal management system, with a focus on long-term reliability, ensuring consistent performance even in harsh operating environments. The core of this active harmonic filter uses high-quality IGBT (insulated gate bipolar transistor) modules from leading manufacturers, which are known for their low switching losses, high withstand voltage, and excellent durability. These IGBT modules are paired with advanced DC bus capacitors to maintain a stable voltage level, enabling precise harmonic current generation for effective harmonic control.To solve the heat dissipation challenge of high-power active filters, the design uses a forced air cooling system with redundant fans and a finned heat sink array. This powerful thermal management scheme ensures that key components operate within the optimal temperature range, preventing overheating and extending product life. The use of advanced thermal conductive materials further improves heat transfer efficiency and minimizes thermal resistance between components. In addition, the PCB (printed circuit board) components are coated with a protective layer to prevent dust, moisture and corrosion, making the APF suitable for harsh industrial environments. Using high-quality materials and a powerful heat dissipation design, the BY91-APF/100A-0.4/4L-B series excels in harmonic elimination, power factor correction and three-phase unbalance compensation, thereby reducing maintenance requirements and ensuring long-term reliability for customers around the world.
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Workshop Vedio
Baoyu Holding Co., Ltd
Baoyu Holding Co., Ltd. was founded in 2015 and is located in Wenzhou City, Zhejiang Province. The location is excellent and the transportation is convenient. We have very rich industry experience and is a trusted supplier. The company has advanced production equipment and skilled front-line employees. Our company is mainly engaged in the production and sales of power quality products，such as active power filters, static var generators, intelligent capacitors, power capacitors, reactive power compensators, composite switches, capacitor contactors, thyristor switches, reactors. Our company knows that the development of the company depends on the innovation and quality of the products. Therefore, our products have strict quality control from the procurement of raw materials to the sale of finished products. The company has established a quality management system that meets the requirements of the international quality management system. The company continuously releases the original innovations according to the market and customer needs, and always maintains the novelty and innovation of the products. The company wants the customer's thoughts and urgency. Solving problems for customers and meeting customer needs is our eternal pursuit! Our company's products are sold worldwide. The company has won the unanimous recognition of consumers with satisfactory product quality and perfect after-sales service. We have a professional R & D team. We can accept O E M and O D M.We sincerely welcome friends from all over the world to visit our company and cooperate with us on the basis of long-term mutual benefits. We are looking forward to receiving your enquiry soon.
Our storage facility utilizes precision climate control, automated 3D warehousing (which increases capacity by 200%), and integrated safety systems (including fire suppression, anti-static protocols, and monthly audits) to maintain zero oxidation and ensure product integrity. In addition, our cleanroom manufacturing facility features a combination of natural and LED lighting, optimized workflows, and cross-trained technicians to enhance efficiency. Automated quality control systems and ISO-certified processes ensure compliance with dimensional and electrical standards, while AI-driven analytics and stringent protocols help achieve near-zero defects. By integrating advanced automation, tailored solutions, and steadfast reliability, Baoyu provides durable, mission-critical power systems, reinforcing our status as the preferred global partner for industries that require precision and innovation.
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