Predictive Control of Bidirectional Voltage Source Converter With Reduced Current Harmonics and Flexible Power Regulation Under Unbalanced Grid
Predictive Control of Bidirectional Voltage Source Converter With Reduced Current Harmonics and Flexible Power Regulation Under Unbalanced Grid
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DOI：
10.1109/tec.2017.2781692
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发表时间：
2018-09
影响因子：
4.9
通讯作者：
Nan Jin;C. Gan;Leilei Guo
中科院分区：
文献类型：
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作者：
Nan Jin;C. Gan;Leilei Guo
针对电网电压不平衡时的并网双向电压型变流器(GC-BVSC)，提出了一种简化和改进的模型预测电流控制(MPCC)方案。在电网电压不平衡的情况下，GC-BVSC的电流谐波分量显著增加，有功功率和无功功率都存在两次网频波动，影响了输出电能质量。为了抑制谐波电流和功率波动，提出了一种改进的MPCC(IMPCC)方法，并提出了GC-BVSC的两步预测模型。电流补偿值由电网电压及其在αβ静止坐标系中滞后90度的正交信号表示。设计了同时减小功率纹波和电流失真的代价函数。与传统方法相比，该方法不需要锁相环、脉宽调制和电网电压的复正负序提取。此外，IMPCC还具有灵活的双向功率调节能力，能够同时降低GC-BVSC的并网电流谐波和功率纹波，具有更好的性能。在电力电子专业(PE-PRO)平台上的仿真和实验结果验证了该方案在单相和三相不平衡电网电压下的有效性。
This paper proposes a simplified and improved model predictive current control (MPCC) scheme for grid-connected bidirectional voltage source converter (GC-BVSC) when the unbalanced grid voltages occur. In conditions of unbalanced grid voltage, the current harmonic components of the GC-BVSC increase significantly, and twice grid-frequency ripple exist in both active power and reactive power, which influence the output power quality. To reduce harmonic currents and power fluctuations, an improved MPCC (IMPCC) method is proposed, and a two-step predictive model of GC-BVSC is put forward. The current compensation values are expressed by grid voltages and their quadrature signals that lag 90 electrical degrees in the αβ stationary coordinates system. The cost function reducing both the power ripple and current distortion is designed. Compared to conventional methods, phase-locked loop, pulse width modulation, and complex positive and negative sequence extraction of grid voltage are not required. In addition, IMPCC presents a better performance by reducing both grid-connected current harmonics and power ripple of GC-BVSC with flexible bidirectional power regulation capability. Simulation and experimental results on power electronics-professional (PE-PRO) platform verify the effectiveness of the proposed scheme under both single-phase and three-phase unbalanced grid voltages.