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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
- Intelligent Switch Series
- Alternating Current Contactor
- Multifunctional power instruments
- Circuit Breaker
- APF/SVG/SPC Cabinet & Module Series
BY91-APF/30A-0.4/4L-B High Quality Low Voltage Active Power/ Harmonic Filter Apf
Model Meaning
Main Datas of BY91-APF/30A-0.4/4L-B Active Harmonic Filter
| Model | BY91-APF/30A-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 | |
Overview of BY91-APF/30A-0.4/4L-B（APF）
The BY91-APF/30A-0.4/4L-B is a state-of-the-art Shunt Active Power Filter (APF) engineered to resolve harmonics in electrical systems and optimize power quality in low-voltage powernetworks. Utilizing Shunt Active Power Filter Working technology, this active harmonic filterdynamically detects and neutralizes harmonic distortions (2nd to 50th order) caused by nonlinear loads in 3-phase power systems, achieving THD levels below 5%. Its current source active filterdesign injects precise compensating currents to eliminate harmonics in power grids, while dynamic reactive power compensation stabilizes 3-phase voltage fluctuations and corrects three-phase imbalance compensation caused by uneven industrial or commercial loads.The system integrates active and passive filters for harmonics, combining rapid response with robust anti-harmonic performance. The intelligent control module enables three-phase unbalanced adaptive correction, autonomously adjusting compensation strategies to balance 3-phase electric currents and voltages. With real-time monitoring of low power voltage and harmonic spectra, the APF ensures high-efficiency energy-saving operations, reducing line losses and optimizing low-voltage reactive power compensation. Designed for power low voltage environments, its anti-interference shielding guarantees reliable performance in electromagnetically noisy settings, making it ideal for factories, data centers, and urban infrastructure.
The BY91-APF/30A-0.4/4L-B excels as a power quality filter across diverse sectors, from industrial plants to renewable energy systems. In manufacturing facilities, its electrical harmonic filter capabilities protect sensitive machinery from power quality harmonics, while dynamic reactive power compensation control enhances grid stability and reduces energy waste. For 3-phase power voltage systems in solar/wind farms, the automatic harmonic filter adapts to variable generation patterns, mitigating harmonic resonance and ensuring seamless power filtering during intermittent energy production.The low-voltage filter module operates at 95%+ efficiency, aligning with global sustainability goals by minimizing low power electricity consumption. Its power harmonic filter functionality is complemented by three-phase unbalanced adaptive correction, which resolves imbalances in 3-phase electric grids connected to unevenly distributed loads or renewable sources. The APF’s compact design and anti-interference technology make it suitable for space-constrained installations, such as commercial buildings with low power voltage infrastructure.By integrating real-time monitoring and intelligent control, the BY91-APF series not only extends equipment lifespan but also ensures compliance with standards. Whether addressing harmonics in electrical systems or optimizing power quality in low-voltage powernetworks, this active power filter delivers unmatched reliability, cost savings, and environmental benefits for modern energy challenges.
Product Features of BY91-APF/30A-0.4/4L-B（APF）
- The shunt active power filter working technology eliminates harmonics in the power system and stabilizes the three-phase power supply voltage through dynamic reactive power compensation.
- Anti-harmonic filter design neutralizes the 2nd to 50th harmonics in the power, reducing THD to less than 5%, thus improving power quality.
- Intelligent control enables adaptive correction of three-phase imbalance and real-time balancing of the three-phase currents of asymmetrical loads.
- Real-time monitoring of low voltage fluctuations to ensure efficient and energy-saving operation and optimize low voltage reactive power compensation.
- Hybrid active and passive harmonic filters provide powerful harmonic mitigation and automatically adjust the harmonic filters for dynamic loads.
- Current source active filter architecture ensures accurate power filtering in low voltage grids, minimizing low power consumption waste.
- Electrical harmonic filter function stabilizes three-phase power systems and is equipped with anti-interference shielding for harsh environments.
- Compact low voltage filter design supports mains low voltage applications, complying with global power quality and sustainability standards.
Working Principle BY91-APF/30A-0.4/4L-B（APF）
Harmonic detection and dynamic compensation core
The BY91-APF/30A-0.4/4L-B active power filter (APF) uses a parallel active power filter working mechanism to detect and eliminate harmonics in the power system. It uses a high-speed DSP processor to analyze the three-phase voltage and current waveforms in real time to identify harmonics (2 to 50 times) caused by nonlinear loads in the three-phase power grid. Then, the current source active filter generates reverse harmonic current to eliminate harmonics in the power system, while performing dynamic reactive power compensation to stabilize the low-voltage power grid. This anti-harmonic filter design reduces total harmonic distortion (THD) to less than 5%, ensuring compliance with power quality standards. Integrated active and passive harmonic filters improve accuracy, while anti-interference shielding ensures reliability in electromagnetic noise environments.
Intelligent control and three-phase balance system
The APF's intelligent control module drives its three-phase unbalanced adaptive correction function. By continuously monitoring the three-phase electrical parameters, the system can autonomously adjust the compensation current to solve the three-phase unbalanced compensation problem caused by unbalanced industrial or commercial loads. The automatic harmonic filter dynamically responds to fluctuating low-power power demand and optimizes dynamic reactive power compensation control to achieve balanced three-phase power supply voltage. This hybrid approach combines power filtering algorithms with electrical harmonic filter hardware to solve voltage sags, swells and flickers. Real-time data from low-power voltage sensors ensures adaptive correction, thereby improving energy efficiency and stabilizing the low-voltage grid under load variation conditions.
High-efficiency inverters and energy optimizers
At the heart of the APF is a high-efficiency IGBT-based inverter that acts as a power harmonic filter, injecting compensation current into the three-phase power system. Operating at over 95% efficiency, this low-voltage filter module minimizes energy losses during harmonic suppression. Dynamic reactive power compensation reduces line losses and enhances low-voltage reactive power compensation, while real-time monitoring of three-phase voltages ensures precise regulation. Designed for low-voltage environments, the system's compact architecture supports efficient energy-saving performance, reducing operating costs for factories and renewable energy plants. Its anti-interference technology withstands harsh electromagnetic conditions, ensuring strong power quality protection and extending equipment life.
Size Informations of BY91-APF/50A-0.4/4L-B（APF）
Applications of BY91-APF/30A-0.4/4L-B（APF）
Commercial and high-density urban infrastructure
BY91-APF/30A-0.4/4L-B active power filter (APF) is essential for stabilizing three-phase power in high-density urban environments such as office buildings, data centers and subway systems. Non-linear loads such as LED lighting, elevators and HVAC systems generate harmonics in the power system, which leads to power quality harmonics and three-phase unbalanced compensation issues. The APF uses parallel active power filter working technology for dynamic reactive power compensation, which can neutralize up to 50th harmonics, ensure three-phase voltage stability, and reduce total harmonic distortion (THD) to less than 5%. Its intelligent control system can realize adaptive correction of three-phase imbalance and automatically balance the current in the three-phase grid when the load is asymmetric. The low-voltage filter monitors the voltage fluctuation of the low-voltage grid in real time and adopts anti-interference shielding technology to ensure reliable power filtering in urban environments with high electromagnetic noise, thereby optimizing the efficient energy-saving performance of critical infrastructure.
Renewable energy systems (solar/wind farms)
In solar and wind farms, BY91-APF/30A-0.4/4L-B can be used as a power quality filter to reduce harmonics generated by inverters and variable speed turbines. The current source active filter dynamically compensates low voltage reactive power to stabilize the three-phase voltage during intermittent generation. Its automatic harmonic filter adapts to rapid load changes, while the three-phase unbalance adaptive correction function solves the imbalance problem in the three-phase grid connected to unevenly distributed renewable energy sources. Hybrid active and passive harmonic filters suppress harmonic resonances to ensure seamless access to the grid. Dynamic reactive power compensation control minimizes energy losses, while real-time monitoring of low power power parameters improves system reliability. Designed for low voltage power environments, the APF ensures sustainable integration of renewable energy into unstable grids, reducing downtime and maintenance costs.
Industrial Manufacturing Facilities
For industrial plants with heavy machinery and inverter-driven equipment, the BY91-APF/30A-0.4/4L-B solves tough power quality challenges such as motor overheating and electrical system harmonics. The shunt active power filter provides dynamic reactive power compensation, stabilizes the three-phase supply voltage, and corrects the three-phase imbalance compensation caused by asymmetrical loads. Its electrical harmonic filter eliminates harmonics up to the 50th order, while the intelligent control function enables adaptive power filtering to protect sensitive automation systems. The low-voltage filter module operates efficiently in a low-voltage environment and uses anti-interference technology to withstand electromagnetic noise generated by welding machines or CNC equipment. Real-time monitoring of three-phase electrical parameters ensures proactive maintenance, while efficient energy-saving algorithms reduce operating costs by up to 30%. This anti-harmonic solution prolongs equipment life and ensures compliance with global standards such as IEEE 519, making it an indispensable solution for demanding manufacturing centers.
Storage Workshop
Production workshop
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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