针对基于查询表的并网逆变器无模型预测电流控制方法中存在的电流纹波大、电流梯度更新停滞和采样噪声干扰等问题，提出了计及采样噪声补偿的三矢量无模型预测电流控制方法。首先，每个控制周期的输出电流由三个电压矢量对应的电流梯度预测得到，并通过价值函数求解各矢量作用时间，降低了电流纹波；其次，根据电压矢量和基本矢量坐标分量的重叠关系，采用两步更新的方式消除停滞现象；最后，根据采样噪声对电流梯度更新的影响，采用二阶广义积分器估计梯度误差并对其进行补偿，进而提高电流梯度的准确性。仿真和实验验证了所提方法的可行性和有效性。

Aiming at the problems of large current ripple, stagnant current gradient update and sampling noise interference in the model-free predictive current control (MFPCC) method of grid-connected inverters based on look-up table (LUT), a three-vector model-free predictive current control method with sampling noise compensation is proposed. Firstly, the output current of each control period is predicted by the current gradient corresponding to the three-voltage vectors, and the action time of each vector is solved by the cost function to reduce the current ripple. Secondly, according to the overlapping relationship between the coordinate components of the three vector and the basic vector, the two-step updating method is used to eliminate the stagnation phenomenon. Finally, according to the influence of sampling noise on current gradient updating, a second-order generalized integrator (SOGI) is used to estimate and compensate the gradient error, so as to improve the accuracy of current gradient. Simulation and experiment verify the feasibility and effectiveness of the proposed method.