Generalized Space Vector Modulation for Impedance Source Inverters Applied to Fuel-Cell-Based Isolated Electric Power Generation

本计画提出一种新的广义空间向量调变方式，应用于燃料电池隔离式发电之阻抗源型逆变器。最佳地确定阻抗源逆变器直通状态，以便具有阻抗源网络的恒定占空比。此特性可确保为转换器提供足够的直流电压。广义空间矢量调制不仅适用于三桥臂逆变器，而且也适用于二桥臂和四桥臂逆变器。因此，期望在没有中间转换器的情况下将由燃料电池产生的相对低的直流电平（Ud = 100 - 150 V）直接转换为单相和三相商用电压（U = 230 V）。中间直流-直流变换器的避免提高了整个系统的性能和可用性。此外，为了找到减小逆变器元件应力的方法，还将调制器采用不连续特性。比较的数字将通过无源和有源元件的损耗模型来开发。

This project proposes a novel generalized space vector modulation for impedance source inverters applied to fuel-cell-based isolated electric power generation. The impedance source inverters shoot-through states are optimally determined in order to have a constant duty cycle of the impedance source network. This characteristic assures the adequate dc voltage that feeds the converter. The generalized space vector modulation is applied not only to three-legged inverters, but it is also applied to two- and fourlegged inverters. Therefore, it is expected to convert relatively low dc levels generated by a fuel cell (Ud = 100 — 150V), without an intermediate converter, direct to single- and three-phase commercial voltages (U = 230V). The avoidance of the intermediate dc-dc converter improves the performance and the availability of the whole system. Moreover, a discontinuous characteristic will be adapted to the modulator in order to find some methods for reducing the stress in the inverter s components. Comparison s figures will be developed through loss models of the passive and active components.