One of the major failure causes in the power modules comes from the severe thermal stress in power semiconductor devices. Recently, some local control level methods have been developed to balance the power loss, dealing with the harsh mission profile, in order to reduce the thermal stress. However, there is not any specific system level strategy to leverage these local control level methods responding to the multiple inverters situation. Besides, the impacts of these methods on the thermal cycle and lifetime of the power modules in the long-term time scale have not been evaluated and compared yet. Hence, in this article, a centralized thermal stress oriented dispatch (TSOD) strategy is proposed to take full advantage of these local control level methods, including the switching frequency variation and the reactive power injection, to reduce the thermal stresses for multiple inverters. In addition to the PI controller, the finite control set model predictive control (FCS-MPC) is also explored to synergize with the proposed strategy. The results from the real-time model-in-the-loop testing on a four-paralleled-inverters platform, the reliability assessment, and the experiments all validate the effectiveness of the proposed centralized TSOD strategy on the thermal stress reduction.

中文翻译：

---

考虑任务概况的并联并网逆变器集中热应力导向调度策略


功率模块的主要故障原因之一来自功率半导体器件的严重热应力。最近，已经开发了一些本地控制级方法来平衡功率损耗，应对恶劣的任务状况，以减少热应力。然而，没有任何特定的系统级策略来利用这些本地控制级方法来响应多个逆变器的情况。此外，这些方法在长期时间尺度上对功率模块的热循环和寿命的影响尚未得到评估和比较。因此，本文提出了一种集中热应力导向调度（TSOD）策略，以充分利用这些本地控制级方法，包括开关频率变化和无功功率注入，以减少多个逆变器的热应力。除了PI控制器之外，还探索了有限控制集模型预测控制（FCS-MPC）以与所提出的策略协同作用。四并联逆变器平台上的实时模型在环测试、可靠性评估和实验的结果都验证了所提出的集中式 TSOD 策略在降低热应力方面的有效性。