Abstract
Reactive compensation variety of ways, the most common is the shunt capacitor compensation. LV dynamic reactive compensation devices is the use of sampling methods for three-phase voltage and current, respectively sampling, week period measured 20 instantaneous value, AD574 conversion from analog to digital 12. RMS calculated by the formula calculated for each phase voltage, current and reactive power Q, the use of voltage and reactive composition of the criteria usually provides the voltage and reactive power of the lower and upper limits and voltage and reactive plane divided into nine districts, according to the voltage and reactive power integrated control method, thyristor controlled by the switching capacitor pair of voltage and reactive power integrated regulate in order to ensure that qualified voltage range, Reactive while achieving the basic balance.
The device respectively compensation three-phase reactive, using thyristor as a non-contact switch, Comparing the use of zero for the capacitors can be realized without the group's rapid transition to the top, Closing avoid the shocks arising from the current damage to the electrical components. The capacitor switching is used for encoding all three groups capacitor capacity by more than 1 : 2 : 4 will be combined into seven levels of capacity, switching control convenience, significant economic benefits.
Control circuit mainly include the exchange of sampling unit, the external expansion unit, display units, the control unit and other components, compact hardware, Programming easy, simple control. The device to real-time detection of network parameters, the system implemented tracking reactive compensation. Compensation results fast, accurate, safe and easy to control, very broad application prospects.
Key words reactive compensation comprehensive control thyristor switches