Abstract: To mitigate the impact of rapid industrial load fluctuations on grid reactive power balance and power quality, this study investigates a CNC workshop in a mechanical processing plant. By analyzing power consumption characteristics of diverse industrial loads (e.g., metallurgical, chemical, and mechanical manufacturing), the research compares technical features of static reactive power compensators, static synchronous compensators, and active power filters. An optimization model was established considering load characteristics, grid structure, compensation objectives, and cost constraints. A hybrid compensation scheme combining static reactive power generators and active power filters was proposed. Simulation results demonstrate that the scheme meets national standards for voltage deviation, power factor, and harmonic distortion rate under normal operation, harmonic interference, and extreme conditions. It effectively addresses reactive power surges caused by CNC equipment startup and emergency shutdowns, achieving coordinated control of dynamic reactive power compensation and harmonic mitigation.