WJB-50 Intelligent Stepless Compensation Device

Product Description

　　The WJB-50 intelligent stepless compensation device, independently developed by XINGSHENG Electrical Appliance Co., Ltd., is mainly used in low-voltage capacitor compensation cabinets in users' low-voltage power distribution systems to improve the power factor of the power supply system. This device uses an FPGA (Field Programmable Gate Array) chip as its computing core, collecting data such as three-phase voltage and three-phase current, and calculating the reactive power of each phase separately. Using advanced real-time dynamic tracking technology, it compensates each phase separately in real-time, keeping the power factor of each phase in an optimal state. It can balance the three-phase power factor and, according to the system's real-time reactive power demand, control the switching of the capacitor group to achieve the optimal state of the maximum power factor (reaching or approaching 1). It has good scalability; multiple devices can be used in parallel without the need to increase the control system, and it can automatically select the capacity and quantity of capacitors to be switched in. This device is a new generation of reactive power governance product with advanced technology, scientific compensation methods, and excellent compensation effects among the current domestic and international three-phase power factor compensation products.

　　The WJB-50 intelligent stepless compensation device is both a controller and a ±(0～40kvar) adjustable capacitor that can compensate for capacitive and inductive reactive power. This device can maintain the power factor above 0.99 for a long time, has a fast response speed, and continuously adjusts from the rated inductive condition to the rated capacitive condition. It can control the switching of the capacitor group by controlling 1-16 channels of composite switches or thyristors. The dynamic response time can be within 3ms, with no discharge time required.

Technical Advantages

　　The WJB-50 intelligent stepless compensation device can maintain the power factor of the user's power distribution system above 0.99 for a long time and has the following technological advantages:

　　1. Fast real-time dynamic tracking response speed: Traditional compensation contactor switching takes 30 seconds, dynamic compensation composite switch switching takes 20 seconds, and dynamic compensation thyristor switching takes 0.02 seconds. The intelligent stepless compensation uses an FPGA (Field Programmable Gate Array) chip for full digital control, with high stability and reliability, fast dynamic response, and compensation of injected reactive current. The response time is only 0.003 seconds (3ms), and no discharge time is required.

　　2. Dynamic bidirectional continuous compensation, no over-compensation: Dynamic bidirectional (inductive/capacitive) continuous compensation of reactive power, continuously adjusting from the rated inductive condition to the rated capacitive condition, and combined with a fixed capacitor group to form continuous compensation of any range. It can not only compensate for reactive power but also absorb reactive power, preventing over-compensation. It can also compensate for instantaneous power outages or voltage drops in the power grid.

　　3. Combined with a capacitor group, perfectly achieving large-capacity stepless compensation: The device uses an advanced dynamic real-time tracking plus capacitor group compensation method, adjusting and controlling the output according to the reactive power required by the load changes. Combined with a composite switch or thyristor, it can control (0-16) channels of capacitor groups. When the load's reactive power demand is greater than the set output of the intelligent stepless compensation device, it can automatically switch in the capacitor group to meet the load's reactive power demand. A single device can achieve (0-960 kvar) ultra-large capacity stepless compensation. It has good scalability; multiple devices can be used in parallel without the need for additional control systems, automatically selecting the capacity of the capacitors to be switched in.

　　4. Balanced three-phase power factor: The device has the function of collecting three-phase current and three-phase voltage data, calculating the reactive power of each phase, and compensating each phase separately to keep the power factor of each phase in the optimal state, achieving the function of balancing the three-phase power factor.

　　5. Remote monitoring and management: In cooperation with Alibaba Cloud, remote monitoring and management of the stepless compensation device can be achieved through network cables, wireless Wi-Fi, or SIM cards (data cards). Real-time monitoring of three-phase current, three-phase voltage, frequency, three-phase power factor, compensation current, number of capacitor groups switched in, and the health status of each capacitor group, harmonic content, and the last 10 historical alarm messages are available. It can also set an alarm when the power factor is below 0.9. Monitoring data is stored on Alibaba Cloud servers, and users can perform real-time monitoring and management on any terminal. It has RS232/RS485 communication interfaces for PC connection.

　　6. Health management: The device can perform intelligent diagnosis of the health status of each circuit in the entire compensation cabinet and estimate the capacity of each circuit capacitor, facilitating remote understanding of the normal or abnormal status of each circuit and the capacity of each capacitor. Users can perform corresponding operations through the LCD human-machine interface, execute various operation commands, easily browse input, output, and load-related parameters and waveforms, obtain the device status and alarm information in time, and provide the last 10 historical warning records for user query, providing a reliable basis for fault diagnosis. This not only saves users the investment in manpower and equipment but also prevents problems before they occur, providing users with more secure and high-quality service.

　　7. Parameter setting function: The full-function monitoring system can set the operating mode, capacitor capacity, number of switching circuits, maximum input protection voltage, power factor, CT ratio, and compensation mode, among other functions. The system requires a password for settings, ensuring independent and secure operation of the machine. All setting parameters are memorized and saved in the system.

　　8. Comprehensive protection functions: The device is independent of the grid system impedance, is not affected by the grid system impedance, and does not cause resonance and harmonic voltage amplification, ensuring high safety. The current is close to a sine wave, does not generate harmonics, and does not pollute the system. It ensures that it will not affect the power supply and distribution system and other equipment under normal and abnormal operating conditions. It also has various internal protections and can automatically reasonably limit the compensation current according to load changes, preventing overcurrent. While compensating, it completely avoids over-compensation. The device's high-frequency carrier will not be fed back to the power grid, avoiding interference with the power supply system and other devices within the system.

　　9. High-reliable quality assurance, MTBF (mean time between failures) greater than 100,000 hours. Using an FPGA chip for full digital control, it features high stability and reliability, and a fast dynamic response. The power module uses IGBT (Insulated Gate Bipolar Transistor) modules, which have strong module function stability and high reliability. The device is independent of the grid system impedance, is not affected by the grid system impedance, and does not cause resonance and harmonic voltage amplification, ensuring high safety. The device itself has minimal loss and requires essentially no maintenance, and there are no resonance overvoltage problems, so the MTBF is greater than 100,000 hours.