三相虚拟磁链观测并网逆变器预测技术研究
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1.上海电力大学 电子与信息工程学院;2.上海海事大学 物流工程学院;3.长沙理工大学 清洁能源与智能电网湖南省协同创新中心

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国家自然科学基金项目(51877130)


Research on prediction technology of three-phase virtual flux observation grid-connected inverter
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1.School of Electronics and Information Engineering,Shanghai University of Electric Power;2.Shanghai Maritime University, School of Logistics Engineering;3.Clean Energy and Smart Grid Hunan Collaborative Innovation Center,Changsha University of Science and Technology

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    摘要:

    基于传统三相并网逆变器模型分析,发现采用虚拟电网磁链定向控制策略,可以有效的减少系统额外的成本,大大提高系统可靠性。在分析传统不加补偿磁链观测模型基础上,为解决相角偏移问题引起系统误差,采用加LPF补偿的磁链观测器模型,研究电容电压观测器和电网电压观测器新设计方法。对传统无差拍控制深入研究,发现存在一定程度的控制延时问题,为解决提出一种改进型的无差拍电流预测控制,增加预测k+2时刻采样电流,抗扰动性能更好。应用三相无交流电压传感器的估计策略与改进型无差拍预测电流控制算法相结合,实验结果验证了所提控制策略的有效性与可行性。

    Abstract:

    Based on the analysis of the traditional three-phase grid-connected inverter model, it is found that the use of virtual grid flux oriented control strategy can effectively reduce the additional cost of the system and greatly improve the system reliability. Based on the analysis of the traditional uncompensated flux linkage observation model, in order to solve the system error caused by the phase angle offset, the flux linkage observer model with LPF compensation is used to study the new design methods of capacitance voltage observer and grid voltage observer. In-depth study of the traditional deadbeat control and found that there is a certain degree of control delay problem. In order to solve the problem, an improved deadbeat current predictive control is proposed, which increases the sampling current at the predicted k+2 time, and has better anti-disturbance performance. Using the three-phase AC voltage sensor-free estimation strategy combined with the improved deadbeat predictive current control algorithm, the experimental results verify the effectiveness and feasibility of the proposed control strategy.

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  • 收稿日期:2021-01-14
  • 最后修改日期:2021-03-30
  • 录用日期:2021-05-19
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