A Modular SiC-Based Step-Up Converter With Soft-Switching-Assisted Networks and Internally Coupled High-Voltage-Gain Modules for Wind Energy System With a Medium-Voltage DC-Grid
A Modular SiC-Based Step-Up Converter With Soft-Switching-Assisted Networks and Internally Coupled High-Voltage-Gain Modules for Wind Energy System With a Medium-Voltage DC-Grid
复制标题
具有软开关辅助网络和内部耦合高压增益模块的模块化 SiC 升压转换器，适用于中压直流电网风能系统
DOI：
10.1109/jestpe.2019.2900281
复制
发表时间：
2019
影响因子：
5.5
通讯作者：
J. Lam
中科院分区：
文献类型：
--
作者：
Mehdi Abbasi;J. Lam
本文提出了一种基于全软开关碳化硅（SiC）的模块化升压谐振转换器，具有磁集成零电流开关倍压器，用于风能系统中的中压（MV）直流转换。传统的升压谐振DC/DC转换器采用高匝数比升压变压器或升压谐振电路来实现升压电压转换。因此，由于高压电气隔离要求，它们要么需要复杂昂贵的变压器结构，要么需要高电压增益敏感的升压谐振电路，这对于设计风能应用的中压转换器来说并不理想。为了解决上述缺点，所提出的转换器配置利用模块化升压谐振电路和磁集成倍压器来实现升压转换功能。 DC/DC升压转换器的每个模块的输出电压通过变频控制来调节，而利用非对称脉宽调制(APWM)控制来平衡每个转换器模块中的所有谐振电路模块中的所有谐振电流。由于使用了 APWM 控制，每个转换器模块中都包含一个简单的无源辅助电路，以在较宽的工作条件范围内扩展软开关操作。提供了采用商用 1.2 kV SiC MOSFET 模块的 1 kV/28 kV、5 MW 转换器系统的仿真结果以及采用商用 SiC MOSFET 和 SiC 肖特基二极管的实验室规模 300 V/4.8 kV、5.6 kW 概念验证原型的实验结果，以验证理论分析并突出所提出工作的优点。
In this paper, a fully soft-switched silicon carbide (SiC)-based modular step-up resonant converter with magnetically integrated zero current switching voltage doublers is proposed for medium-voltage (MV) dc conversion in wind energy systems. Conventional step-up resonant dc/dc converters employ either high turns-ratio step-up transformer or step-up resonant circuits to achieve step-up voltage conversion. As a result, they require either complicated expensive transformer structure due to high-voltage electrical isolation requirement or highly voltage-gain sensitive step-up resonant circuits, which are not ideal for designing MV converters for wind energy application. In order to solve the aforementioned drawbacks, the proposed converter configuration utilizes both modular step-up resonant circuits and magnetically integrated voltage doublers to achieve the step-up voltage conversion function. The output voltage of each module of the dc/dc step-up converter is regulated through variable frequency control, whereas asymmetrical pulsewidth modulation (APWM) control is utilized to balance all the resonant currents in all the resonant circuit modules in each converter module. Since APWM control is used, a simple passive auxiliary circuit is included in each converter module to extend soft-switching operation over a wide range of operating conditions. Simulation results on a 1-kV/28-kV, 5-MW converter system with commercial 1.2-kV SiC MOSFET modules and experimental results on a laboratory-scale 300-V/4.8-kV, 5.6-kW proof-of-concept prototype with commercial SiC MOSFET and SiC Schottky diodes are provided to validate the theoretical analysis and to highlight the merits of the proposed work.