Abstract: With the rise of zero-carbon park construction, the stability of system frequency under off-grid operation has become increasingly prominent. On one hand, frequency fluctuations can lead to reduced operational efficiency of electrical equipment, even causing hazards such as overheating, mechanical damage, and lifespan degradation. On the other hand, random power fluctuations from electrical equipment can disrupt system frequency stability. This paper focuses on frequency stability control research for off-grid operation in zero-carbon parks. Through a combination of field measurements and quantitative analysis, it systematically reveals the mathematical relationships between frequency fluctuations and the operating power of variable frequency drives, rectifiers, resistive heating devices, electromagnetic heating devices, and asynchronous motors. Based on the quantitative analysis results of frequency fluctuations and electrical equipment power, a frequency stability control strategy applicable to microgrids is formulated. The results show: 1) The impact of frequency fluctuations on electrical equipment power is related to sensitivity coefficients, where larger absolute values of frequency sensitivity coefficients indicate more significant effects. 2) Air conditioning (variable frequency type) equipment has a sensitivity coefficient of 6.845, making it a disturbance source for active power balance; supply fans (asynchronous motor type) have a frequency sensitivity coefficient of 1.407, classifying them as typical linearly sensitive loads; refrigerators, resistive heating furnaces, rectifiers, and electromagnetic heating furnaces have sensitivity coefficients below 0.220, belonging to micro-sensitive loads. 3) Implementing a control strategy combining "categorized management, active utilization, prevention, and emergency control" based on load frequency sensitivity characteristics can effectively suppress secondary frequency disturbances caused by random power fluctuations from highly sensitive loads, thereby improving system frequency stability under off-grid operation conditions in park microgrids.