Working principle and characteristics

　　The DDB series dynamic reactive power compensation device is composed of a controller, a trigger unit, a thyristor, a reactor, a capacitor, and a protection element. The controller uses a digital signal processor DSP as the core to track and measure the power factor, reactive power, and The preset set value is compared, and the capacitors of the number of unconnected groups are dynamically controlled to ensure that the power factor always meets the total setting requirements. The entire measurement execution process is completed within one cycle (the time is less than 20ms), and the controller ensures that the thyristor is triggered at zero crossing, so that the switching capacitor has no impact, no inrush current, and no transitional engineering. It not only dynamically tracks the load change, but also overcomes the harm caused by the traditional reactive power compensator to the capacitor.

　　1. With microprocessor as the core of detection and control, real-time detection of load reactive power, rapid calculation of compensation capacity, and rapid judgment and control according to preset switching logic;

　　2. The use of thyristors to form a high-speed non-contact switching switch has timely and rapid response, high reliability, and long service life. The automatic tracking selection system switches the capacitor bank at all times during the zero transition process. The transient process is extremely short, and the reactive power is reduced. Fast dynamic compensation;

　　3. The dynamic response speed is less than 20 milliseconds, the power factor is dynamically compensated to above 0.9, and the voltage fluctuations caused by reactive power changes can be effectively suppressed;

　　4. The capacitor switching control adopts the weighted coding cycle, the first switching first, and the switching is fast and accurate. It can further reduce the working stress of the capacitor and fully extend the life of the capacitor;

　　5. Capacitor switching threshold and response time are programmable, and the switch between manual switching and automatic switching can be realized, debugging and inspection are convenient, and the applicability is wider;

　　6. ​​With self-checking function, over-voltage protection, over-current protection and other hardware protection functions, to ensure the stable and reliable operation of this cup;

　　7. Automatically monitor system voltage, current, active power, reactive power and power factor before and after compensation.

　　Executive standard

　　JB7113-93

　　GB/T15576-2008

　　The main technical parameters

　　Conform to the standard: GB/T15576-2008 general technical conditions of reactive power static compensation device

　　Compensation power: (kvar), can be configured according to user requirements

　　System frequency: 50Hz

　　Compensation power factor: ≥0.9

　　Environmental temperature: -30℃—+50℃

　　Structural form: optional standard cabinets such as GGD, GCS, GCK, MNS, etc., can be installed in parallel with the low-voltage power distribution cabinet, or can be designed and manufactured according to the actual needs of users

　　Protection function: filtering, overheating, overvoltage, undervoltage, harmonic and other functions

　　Protection level: IP20—IP30 (determined by the type of power distribution cabinet selected)

　　Residual voltage: 3 minutes after the applied voltage is disconnected, it drops below 50V

　　Reactor reactance rate selection: 4.5%—7%; 12%—14%, determined according to the harmonic status of the power grid