Model predictive control for single-phase cascaded H-bridge photovoltaic inverter system considering common-mode voltage suppression

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-08-07 DOI:10.3389/fenrg.2024.1371239
Xinwei Wei, Wanyu Tao, Xunbo Fu
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Abstract

In this article, a model predictive control (MPC) with common-mode voltage (CMV) suppression is proposed for single-phase cascaded H-bridge (CHB) inverters, which can also simultaneously achieve control objectives of grid-connected current tracking, voltages balancing of different H-bridge submodules on the DC-side and switching frequency reduction. To suppress high-frequency components of the common-mode voltage without additional switching devices, the algorithm proposed designs the predicted and reference values of the CMV and incorporates them in the cost function. At the same time, the capacitor voltages balancing control is integrated in the calculation of the optimal modulation function of the H-bridge, which reduces the complexity of control effectively. Besides, switching times of the MOSFETs are compared in two cycles. The cost function is constructed to represent comprehensive effect of the control. Finally, an experiment is performed on the hardware-in-the-loop experimental platform. The experimental results show that the proposed algorithm can offer a better voltage THD and reduce the times of switch action by nearly half while maintaining high-precision current tracking and maximum power point of photovoltaic modules, which alleviate the potential electromagnetic interference and cabling problem.
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考虑共模电压抑制的单相级联 H 桥光伏逆变器系统的模型预测控制
本文针对单相级联 H 桥 (CHB) 逆变器提出了一种具有共模电压 (CMV) 抑制功能的模型预测控制 (MPC),它还能同时实现并网电流跟踪、直流侧不同 H 桥子模块的电压平衡以及降低开关频率等控制目标。为抑制共模电压的高频分量而无需额外的开关设备,所提出的算法设计了 CMV 的预测值和参考值,并将其纳入成本函数。同时,在计算 H 桥的最佳调制功能时,还纳入了电容器电压平衡控制,从而有效降低了控制的复杂性。此外,MOSFET 的开关时间在两个周期内进行比较。构建了成本函数来表示控制的综合效果。最后,在硬件在环实验平台上进行了实验。实验结果表明,所提出的算法可以提供更好的电压总谐波失真(THD),并将开关动作时间减少近一半,同时保持高精度的电流跟踪和光伏组件的最大功率点,从而缓解了潜在的电磁干扰和布线问题。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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