非理想电网下NPC三电平逆变器多目标模型预测控制方法研究 *

doi:10.11985/2019.03.004

摘要/Abstract

摘要：

为了提高非理想电网条件下中点钳位型三电平并网逆变器输出电能质量,同时抑制直流侧中点电压波动,建立了非理想电网条件下三电平并网逆变器输出电流和直流侧中点电压的预测模型。为了适应不同的应用环境,提出了实现三相电流平衡、抑制有功功率波动、抑制无功功率波动三个独立控制目标下的电流参考计算方法,进而实现了非理想电网条件下三电平并网逆变器的多目标模型预测控制。与传统控制线性方法相比,模型预测控制能够实现并网电流与中点电压的协同控制,减少了参数设计的复杂性。仿真结果显示,非理想电网条件下,所研究的模型预测控制能够实现在不同目标下对并网电流和输出有功功率的良好并网控制,兼顾直流侧中点电压平衡。

关键词: 非理想电网, 三相三电平并网逆变器, 多目标, 模型预测控制, 中点电压

Abstract:

To improve the quality of output current and power of grid-connected inverter and suppress the fluctuation of the mid-point voltage in the DC-link under the non-ideal grid conditions, the predictive model of the output current of the inverter and the unbalanced voltage of the DC-side are derived. And to adapt the different application environment, the current reference calculation method is discussed for three independent control targets, i.e., balanced and sinusoidal three-phase output current and stable output active and reactive power. Compared with the traditional control method, model predictive control method can control the output current and midpoint voltage uniformly, which decreases the complexity of parameter design and simplifies the control structure. The simulation results show that proposed model predictive control method can achieve good grid-connected control of output current and power under different control targets in non-ideal grid conditions, and balance the DC-link midpoint voltage.

Key words: Non-ideal grids, three-phase three-level grid-connected inverters, multi-target, model predictive control, mid-point voltage

中图分类号:

TM464

闫涵,吕建国,丁金勇,马丙辉,阎亦然. 非理想电网下NPC三电平逆变器多目标模型预测控制方法研究 ^*[J]. 电气工程学报, 2019, 14(3): 23-32.

YAN Han,LÜ Jianguo,DING Jinyong,MA Binghui,YAN Yiran. Research on the Multi-target Grid-connected Control Method of NPC Three-level Inverter Based on Model Prediction under Non-ideal Grid Conditions[J]. Journal of Electrical Engineering, 2019, 14(3): 23-32.

图/表 7

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参数	数值
电网基频f/Hz	50
直流侧电压V_dc/V	800
直流侧电容C₁(=C₂)/μF	150
中点电压权重系数λ_dc	1
采样周期T_s/μs	50
等效电阻R/Ω	1
等效电感L/mH	5