基于三矢量的储能型准Z源光伏逆变器模型预测电流控制

doi:10.19799/j.cnki.2095-4239.2020.0039

摘要/Abstract

摘要：

本工作针对传统模型预测电流控制存在电流脉动较大而导致电流控制精度较低的问题，提出一种应用于储能型准Z源逆变器(energy-storage quasi-Z source inverter，ES-qZSI)的三矢量模型预测电流控制。首先以d、q轴电流为控制变量，根据最近三矢量原则构造6个虚拟电压矢量，以便逆变器输出电压矢量范围可以覆盖任意方向和幅值，提高了系统的电流控制精度。然后利用d、q轴最小电流误差原则计算各离散电压矢量的作用时间，最后经6次电流预测，得到作用于逆变器的最优电压矢量。仿真结果显示，与传统模型预测控制方法相比，该方法的电流畸变率降低了2.92%，电流脉动更小，逆变器的输出性能更优越。

关键词: 储能型准Z源逆变器, 三矢量模型预测控制, 虚拟电压矢量, 电流畸变率, 电流脉动

Abstract:

In this study, a three-vector-based model predictive current control (MPCC) is proposed for an energy-storage quasi-Z-source inverter because of the low accuracy of MPCC that can be attributed to large current ripples. The current in a synchronously rotating coordinate system is considered to be the control variable, and six virtual voltage vectors are constructed according to the nearest three vectors principle; thus, the output voltage vector range of the inverter can cover any direction and amplitude. Then, the minimum current error principle with respect to the direct and quadrature axes is used to calculate the duration of each discrete voltage vector. Finally, the optimal voltage vector acting on the inverter is obtained via six current predictions. The simulation results show that the current distortion rate of this method is 2.92% less than that of the traditional MPCC. Furthermore, the current ripple is smaller, and the output performance of the inverter is superior.

Key words: energy-storage quasi-Z-source inverter, three-vector-based model predictive current control, virtual voltage vector, current distortion rate, current ripple

中图分类号:

TQ 028.8

汤旻安, 杨尚梅, 许希元. 基于三矢量的储能型准Z源光伏逆变器模型预测电流控制[J]. 储能科学与技术, 2020, 9(4): 1159-1166.

TANG Min’an, YANG Shangmei, XU Xiyuan. Three-vector-based model predictive current control for energy-stored quasi-Z-source PV inverter[J]. Energy Storage Science and Technology, 2020, 9(4): 1159-1166.

图/表 12

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开关状态	非直通								直通
输出电压	u₀	u₁	u₂	u₃	u₄	u₅	u₆	u₇	u₈
S₁	0	1	1	1	0	0	0	1	1
S₄	1	1	0	0	0	1	1	0	1
S₃	0	0	1	1	1	0	0	1	1
S₆	1	1	1	1	0	0	0	0	1
S₅	0	0	0	0	1	1	1	1	1
S₂	1	0	0	1	1	1	0	0	1

参数	数值
电网线电压/V	70
输入电压u_pv/V	150～250
电池电压u_B/V	39.3
RL负载L, R/mH, Ω	7.1,5.0
光伏电池内阻r_s/Ω	2.58
qZSI电感L₁, L₂/μH	2100
qZSI电容C₁, C₂/μF	2300

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