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提出了一种滤波电感参数的在线估计方法,从而可以防止传统预测电流控制方法在滤波电感参数不匹配时可能出现的电流相位差和系统不稳定问题。通过简化小型分布式单相并网发电系统的等效电路,同时考虑逆变器输出电流过零附近存在的死区效应,结合三点中值滤波方法,建立了基于每个电网电压周期的正负采样区间的平均电感参数在线估计方程。针对电感参数变化、逆变器输出电流幅值变化以及注入一定的谐波电流、电网电压幅值变化和注入一定幅值的谐波电压等各种情况,进行了仿真和实验研究,结果证明本文所提出的方法是正确可行的。
A method for on-line estimation of filter inductance parameters is proposed, which can prevent the current phase error and system instability that may occur when the traditional prediction current control method does not match the filter inductance parameters. By simplifying the equivalent circuit of a small distributed single-phase grid-connected power generation system and taking into account the dead-zone effect around the output current zero-crossing of the inverter, a three-point median filtering method is used to establish a On - line Estimation Equation of Average Inductance Parameter in Negative Sampling Interval. The simulation and experimental research are carried out on the variation of inductance parameters, the variation of inverter output current amplitude, the injection of certain harmonic current, the variation of voltage amplitude of the power grid and the harmonic voltage injected into a certain amplitude. The results show that The proposed method is correct and feasible.