STB series harmonic suppression integrated power capacitor compensation device (hereinafter referred to as intelligent harmonic suppression capacitor) is composed of intelligent measurement and control unit, synchronous zero switching switch, intelligent protection unit, networking unit, display unit, one (△ type) or An intelligent reactive power compensation system composed of a (Y-type) low-voltage self-healing power capacitor and a high-quality reactor. The product has the characteristics of modularization, standardization and maintenance-free, and has functions such as zero switching, graded compensation, overcurrent, overvoltage, overtemperature protection, fault self-diagnosis, measurement, communication, signal and online. STB series intelligent harmonic suppression capacitors are used in low-voltage power systems with serious harmonic content in the power grid. They can operate safely and reliably without generating harmonics. They have no amplification effect on harmonics, and have the function of absorbing harmonics in certain procedures. It can effectively improve the power factor of the system, reduce the line loss, and improve the power quality of the power grid.