Soft-Switched Interleaved DC/DC Converter as Front-End of Multi-Inverter Structure for Micro Grid Applications
Soft-Switched Interleaved DC/DC Converter as Front-End of Multi-Inverter Structure for Micro Grid Applications
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DOI：
10.1109/tpel.2017.2768379
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发表时间：
2018-09
影响因子：
6.7
通讯作者：
Shelas Sathyan;H. Suryawanshi;A. B. Shitole;M. Ballal;V. Borghate
中科院分区：
文献类型：
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作者：
Shelas Sathyan;H. Suryawanshi;A. B. Shitole;M. Ballal;V. Borghate
提出了一种带零电压开关的隔离式四通道dc/dc变换器，作为多逆变器结构的前端，将可再生能源和其他低压能源集成到微电网中。采用交错技术将转换器的各个模块连接到一个共同的直流电源上。这种直流电源可以是燃料电池堆、光伏板、电池或任何其他低压直流电源。所有四个通道都是交错的，并且每个通道的门信号之间提供了90^{\circ}$的相移，从而减少了输入电流纹波。所提出的转换器的输出端口提供四个隔离和调节的直流电压。这些隔离直流电源可以串联或并联或串并联，以获得各种逆变器结构所需的直流电压。二极管箝位多电平逆变器的电容电压平衡等问题可以通过所提出的变换器克服。该变换器采用耦合电感进行隔离和储能，并结合电压乘法器电路，可以在较低的匝数比下实现较高的电压升压，在中等占空比下实现较低的电压应力。因此，大多数低额定电压（低$R_{DS}(\text{ON})$）可以用来降低导通损耗。开发了一个2kw的交错dc/dc变换器原型，并使用二极管箝位的三电平逆变器、五电平逆变器和三相两电平逆变器进行了测试，以验证设计。
An isolated four channel dc/dc converter with zero voltage switching is proposed as the front-end of multiple inverter structures to integrate renewable and other low voltage energy sources to micro grids. The interleaving technique is adopted to connect each module of proposed converter to a common dc source. This dc source can be a fuel cell stack, PV panels, battery, or any other low voltage dc source. All four channels are interleaved and a phase shift of $90^{\circ }$ is provided between the gate signals of each channels, which reduces the input current ripple. The output port of the proposed converter provide four isolated and regulated dc voltages. These isolated dc sources can be connected in series or parallel or series-parallel manner to obtain required dc-link voltage of various inverter structure. Issues like capacitor voltage balancing of diode clamped multilevel inverters can overcome through the proposed converter. By incorporating a coupled inductor for isolation and energy storage along with voltage multiplier circuit, the proposed converter can achieve higher voltage step up with lower turns ratio and lower voltage stress at moderate duty ratio. Hence, mosfets of low voltage rating (low $R_{DS}(\text{ON})$ ) can be utilized to reduce conduction loss. A 2 kW prototype of the proposed interleaved dc/dc converter is developed and tested with diode clamped three-level inverter, five-level inverter, and three-phase two-level inverter to verify the design.