简化矢量选择永磁同步电机预测电流控制

Predictive Current Control of Permanent Magnet Synchronous Motor Based on Simplified Vector Selection

预测电流控制可减小逆变器开关频率,提高电机快速响应能力。基于最小化目标函数的原则,传统的预测电流控制采用枚举法选择最优电压矢量,由于枚举法需要对所有基本电压矢量作用下的系统动态行为进行预测,因此算法计算量较大,限制了该方法在实际工程中的应用。针对这一问题,提出一种基于简化矢量选择的模型预测控制算法,该算法利用预测电流与参考电流的误差,只需要进行一次预测即可选出最优电压矢量,因此可显著降低算法的复杂度和计算量。在Matlab仿真平台进行实验,结果表明该算法能有效地实现对永磁同步电机的控制。

Predictive current control can reduce inverter switching frequency and improve motor’s quick response ability.Based on the principle of cost function minimization,traditional predictive current control selects the optimal voltage vector by evaluating all the feasible ones.It is computationally intensive and impractical for this method to predict future behaviors of the system under all voltage vectors.In order to solve this problem,an improved scheme is proposed in this work.In this algorithm,the optimal voltage vector can be selected by one prediction according to the error of the actual current and the reference one,thus the complexity and the computation of the algorithm can be reduced significantly.The experimental results based on Matlab simulation platform show that this control algorithm can achieve the good control performance.