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• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 物理代写|光电技术代写Photovoltaic Technology代考|HERIC Topology

The patented Highly Efficient and Reliable Inverter Concept (HERIC) inverter by Sunway, [16] is well known with its high-efficiency performance. A freewheeling path $\left(S_5\right.$ and $\left.S_6\right)$ is added to the output AC side of conventional full-bridge inverter structure as shown in Fig. 29. Despite the low-loss AC-decoupling topology, the freewheeling switches are operated only at grid frequency. This reduces the switching loss significantly.

Each pair of the diagonal switches, i.e., $S_1, S_4$ and $S_2, S_3$, is operated simultaneously at switching frequency during the positive and negative half-cycle respectively. Current flows through the corresponding pair of diagonal switches to generate the unipolar output voltage and sinusoidal grid current as shown in Fig. 30. On the other hand, the freewheeling switches, $S_5$ and $S_6$, are ON throughout the negative and positive half-cycle respectively. During the freewheeling period of positive half-cycle, current freewheels through $S_5$, the anti-parallel diode of $S_6$ and the grid; and through $S_6$, the anti-parallel diode of $S_5$ and the grid during the freewheeling period of negative half-cycle.

Galvanic isolation is provided via the freewheeling path. Similar to $\mathrm{H} 5$ topology, the CMV is not constant and large oscillation is observed in Fig. 31. The CMV is oscillating with amplitude depending on the parasitic parameters of the resonant circuit. As illustrated in Fig. 31, the leakage current is generated owing to the charging and discharging of the stray capacitances by the CMV.

## 物理代写|光电技术代写Photovoltaic Technology代考|H6 Topology

H5 and HERIC focus only on providing galvanic isolation while neglecting the effect of the CMV. As a matter of fact, the CMV of these topologies is still floating due to the influence of switches’ junction capacitances and parasitic parameters. This issue is mitigated by the clamping branch of $\mathrm{H} 6$ topology [18]. Two DC bypass switches, $S_5$ and $S_6$ and two clamping diodes, $D_5$ and $D_6$, are added to the conventional full-bridge inverter as presented in Fig. $32 .$

Throughout the positive half-cycle, $S_1$ and $S_4$ are ON. $S_5$ and $S_6$ commutate simultaneously at switching frequency while $S_2$ and $S_3$ commutate together but complementarily to $S_5$ and $S_6$. Current flows through $S_5, S_1, S_4$, and $S_6$ to generate the desired output voltage as shown in Fig. 33. Similarly, $S_2$ and $S_3$ are ON throughout the negative half-cycle. $S_5$ and $S_6$ commutate simultaneously at switching frequency while $S_1$ and $S_4$ commutate together but complementarily to $S_5$ and $S_6$. During the freewheeling period of negative half-cycle, $S_5$ and $S_6$ are OFF and $S_1$ and $S_4$ are ON.

During the freewheeling period of positive half-cycle, $S_5$ and $S_6$ are OFF and $S_2$ and $S_3$ are $\mathrm{ON}$. Therefore, freewheeling current finds its path in two ways, i.e., $S_1$ and the anti-parallel diode of $S_3 ; S_4$ and the anti-parallel diode of $S_2$. At this moment, the clamping diodes clamp the freewheeling path completely to constant, $V_{\mathrm{DC}} / 2$. Freewheeling current finds its path in two ways, i.e., $S_3$ and the anti-parallel diode of $S_1$, and $S_2$ and the anti-parallel diode of $S_4$. The PV is disconnected from grid by the use dc-bypass switches, $S_5$ and $S_6$. At this moment, the clamping diodes ( $D_5$ and $D_6$ ) clamp the freewheeling path completely to constant at $V_{\mathrm{DC}} / 2$.

With implementation of the clamping diodes, the CMV is clamped to the constant, and thus the leakage current is eliminated as indicated in Fig. $34 .$ Nevertheless, H6 topology suffers from high conduction losses as the bypass switches have been added into the conduction path.

# 光电技术代考

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## 物理代写|光电技术代写光伏科技代考|H6拓扑

H5和HERIC只关注于提供电隔离，而忽略了CMV的影响。事实上，由于开关的结电容和寄生参数的影响，这些拓扑的CMV仍然是浮动的。$\mathrm{H} 6$拓扑[18]的夹紧分支缓解了这个问题。在传统的全桥逆变器上增加两个直流旁路开关$S_5$和$S_6$，以及两个夹紧二极管$D_5$和$D_6$，如图$32 .$

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

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