With the increasing proportion of wind power, its volatility and intermittency pose significant challenges to power grid operation. Storage systems can effectively smooth wind power output fluctuations and improve consumption capacity, making the scientific evaluation of the operational performance of wind-storage-grid coordinated systems a critical issue. This paper designs a comprehensive evaluation model, selecting four indicators: active power, reactive power, voltage regulation capability and frequency modulation level, using the forward-backward sweep method for calculating system power distribution, suitable for the single-source radial structure of current urban distribution networks with efficiency and accuracy, Newton-Raphson method for solving node voltages with high precision and frequency response model for analyzing dynamic frequency characteristics via transfer functions to evaluate frequency modulation performance for quantitative assessment. The improved Analytic Hierarchy Process (AHP) with a three-scale judgment matrix is adopted to analyze indicator weights, reducing the subjectivity of the traditional nine-scale method. Combined with technical requirements in the Technical Code for Connecting Wind Farms to Power Systems, operational regulatory suggestions are proposed to enhance the safety and stability of the wind-storage combined system.