This product is a power quality control device based on seagree integrated power quality compensation unit. It is a device that can track system harmonics in real time and filter them dynamically and quickly. The device adopts full digital intelligent control system, which can effectively, quickly and smoothly filter out the 2-50 harmonics in the distribution system and avoid grid resonance. In addition to the strong harmonic filtering ability, the device also has the function of signal compensation and three-phase imbalance compensation from inductive to capacitive reactive power. Using a single device can solve the problems of harmonic, reactive power and three-phase imbalance in the existing system, and can significantly improve the power quality. The device adopts modular design, which can be easily and flexibly configured to adapt to different applications and has capacity expansion function. The energy density of the device is high, and the compensation capacity of a single cabinet can reach 600A (400V), which is suitable for the combination of various large capacity and high harmonic electric fields.