A Constant Switching Frequency Finite-Control-Set Predictive Current Control Scheme of a Five-Phase Inverter With Duty-Ratio Optimization
A Constant Switching Frequency Finite-Control-Set Predictive Current Control Scheme of a Five-Phase Inverter With Duty-Ratio Optimization
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DOI：
10.1109/tpel.2017.2707440
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发表时间：
2018-04
影响因子：
6.7
通讯作者：
Cheng Xue;Wensheng Song;Xuesong Wu;Xiaoyun Feng
中科院分区：
文献类型：
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作者：
Cheng Xue;Wensheng Song;Xuesong Wu;Xiaoyun Feng
众所周知，有限控制集模型预测电流控制（FCS-MPCC）的两个特殊问题是附加的低次谐波电流和所有可用控制集的成本函数值的巨大计算量。为此，本文提出了一种具有占空比优化的五相逆变器FCS-MPCC方案。首先，定义了一组具有低阶谐波消除功能的重构虚电压矢量（V3），并将其作为FCS-MPCC方案的控制集；这样就不需要成本函数中存在谐波项和加权因子。然后，采用零矢量组合和各控制层选择的V3对脉冲序列进行重新排列，实现恒定开关频率。此外，基于成本函数优化，还估计了所选V3和零向量在每个控制层的持续时间，以最小化不同子空间中的稳态电流波纹。最后，对本文提出的V3-FCS-MPCC方案与其他fcs - mpcc方案进行了仿真和实验比较。仿真和实验结果验证了所提出的V3-FCS-MPCC方案能够保持结构简化、动态性能快、开关频率恒定、在不同子空间实现最小电流纹波。
As is well known, the additional low-order harmonic currents and the huge computation amount of the cost function value with all available control sets are the two special issues of finite-control-set model predictive current control (FCS-MPCC) for multiphase inverters. Thus, this paper proposes a FCS-MPCC scheme with duty-ratio optimization for five-phase inverters. First, a group of the reconstructed virtual voltage vectors (V3) with low-order harmonic elimination is defined and employed as the control sets in FCS-MPCC scheme. Thus, it leads to no requirement for harmonic items and weighting factors existing in the cost function. Then, a combination of zero vectors and the selected V3 during each control horizon is adopted to rearrange the pulse sequence, which can realize constant switching frequency. In addition, the durations of the selected V3 and zero vectors during each control horizon are also estimated to minimize the steady-state current ripples in different subspaces based on the cost function optimization. Finally, a comparison of the proposed V3-FCS-MPCC scheme and the other FCS-MPCCs are presented in simulation and experimental test. Simulation and experimental results verify that the proposed V3-FCS-MPCC scheme can remain the simplified structure, fast dynamic performance, constant switching frequency, and achieve minimum current ripples in different subspaces.