A novel model predictive control algorithm to suppress the zero-sequence circulating currents for parallel three-phase voltage source inverters

2016 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2016-05-12 DOI:10.1109/APEC.2016.7468365

Zicheng Zhang, Alian Chen, Xiangyang Xing, Chenghui Zhang

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引用次数: 19

Abstract

The topology of parallel three-phase voltage source inverters (VSIs) has been widely utilized to raise system power rating, but zero-sequence circulating currents (ZSCCs) are generated by control effect and hardware parameter differences. ZSCCs could lead to current distortion and impact the system stability. The model predictive control (MPC) method has been applied to the inverters to get high robustness, fast dynamic response and low switching frequency. However, the MPC method is rarely used in parallel inverters because of the ZSCCs problem. This paper proposes an improved MPC algorithm for parallel system to track the reference currents as well as suppress the ZSCCs. The contribution of each space vector to ZSCCs is analyzed and the cost function is redesigned in the new method. The cost function will pick out the optimal vectors to guarantee the control requirements. Experimental results verified that the improved algorithm is effective and performs well in both current tracking and ZSCCs suppression.

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一种新型模型预测控制算法抑制并联三相电压源逆变器零序循环电流

并联三相电压源逆变器(vsi)的拓扑结构被广泛用于提高系统额定功率，但由于控制效果和硬件参数的差异，会产生零序循环电流(ZSCCs)。ZSCCs可能导致电流畸变，影响系统稳定性。将模型预测控制(MPC)方法应用于逆变器中，以获得高鲁棒性、快速动态响应和低开关频率。然而，由于ZSCCs问题，MPC方法很少用于并联逆变器。本文提出了一种改进的MPC算法，用于并联系统的参考电流跟踪和zscc抑制。分析了各空间向量对ZSCCs的贡献，重新设计了成本函数。成本函数将挑选出最优向量以保证控制要求。实验结果验证了改进算法的有效性，在电流跟踪和ZSCCs抑制方面都有很好的效果。

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2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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