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Performance optimisation of the grid-connected flyback inverter under improved hybrid conduction mode

机译：改进混合传导模式下电网连接的反向逆变器的性能优化

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摘要

In the unfolding-type interleaved two-switch flyback inverter (ILTFI) operating in discontinuous conduction mode (DCM), the hybrid control strategy combining the one-phase DCM and the two-phase DCM has a significant impact on improving the efficiency under all load conditions. In the situation where the marginal power of this control strategy is increased, the converter may enter CCM. Consequently, the converter cannot track the reference current and the output current quality is notably decreased. To tackle this issue, a novel hybrid control method is proposed which varies the switching frequency based on the output power. The proposed approach is immune to the loss analysis and power losses of the components. Hence, it is independent of components selection and their characteristics. In this case, the smooth transition between the one-phase and the two-phase operation modes is guaranteed without affecting the output power quality and the stability of the converter in DCM. The control complexity of the proposed scheme is low and the converter can be easily controlled in DCM. The performance of the flyback microinverter with the proposed hybrid control scheme is verified by the simulation and the experimental results together with the loss analysis.
机译：在以不连续的传导模式（DCM）操作的展开型交错的两次开关反式逆变器（ILTFI）中，混合控制策略结合单相DCM和两相DCM对提高所有负载下的效率产生重大影响使适应。在该控制策略的边际功率增加的情况下，转换器可以进入CCM。因此，转换器无法跟踪参考电流，并且输出电流质量显着降低。为了解决这个问题，提出了一种新的混合控制方法，其基于输出功率改变开关频率。所提出的方法对组件的损耗分析和功率损耗免疫。因此，它与组件选择及其特征无关。在这种情况下，保证单相和两相操作模式之间的平滑过渡，而不影响DCM中的输出功率质量和转换器的稳定性。所提出的方案的控制复杂性低，转换器可以在DCM中容易地控制。通过模拟和实验结果验证了具有所提出的混合控制方案的反激式微逆变器的性能与损耗分析一起验证。

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