The invention relates to a
communication control-based low-
voltage reactive compensation device. Communication connection is performed between a reactive compensation controller and an intelligent
capacitor and between intelligent capacitors, no other control loop is needed; zero-
voltage putting and zero-
voltage removal of the
capacitor are achieved by arranging a composite switch in each intelligent
capacitor, and the composite switch comprises an AC
relay and a
silicon-controlled
rectifier; the reactive compensation controller is provided with an AC acquisition module, a communication moduleand a special
chip, active powers, reactive powers and power factors of phases A, B and C of a low-voltage side of a
transformer are calculated according to a current
signal of a
secondary side of acurrent
transformer and a directly-acquired voltage
signal, switching and removal of the intelligent capacitor are controlled by a communication mode according to a calculation result, a power factorof a user is stabilized within a set range in real time, the output power of the
transformer is improved, the
electric energy quality is improved, and the
line loss is reduced. The reactive compensation device provided by the invention employs
modular design and is simple in structure, and capacity expansion is facilitated.