舰船、电厂和钢铁等生产中的重要负荷感应电机失电后要求快速地切换至备用电源，但这类动态负荷在不利条件下所带来的瞬态冲击会产生严重的后果。为解决这一问题，提出一种基于固态切换开关（SSTS）的感应电机类负荷电源快速切换控制新策略，其在各种备用电源与主电源间相位差下，既能够快速将关键负荷从主电源切换至备用电源上，又能够有效抑制电源切换中的瞬态冲击；然后，深入分析了备用电源投入控制过程中感应电机的复杂瞬态，重点讨论了影响瞬态冲击抑制的主要因素；此外，还研究计算了已知备用电源与主电源间具有相位差时控制参数与电流峰值之间的关系，并根据电流抑制需求确定控制参数；最后，通过定子电流计算结果和实测波形，验证了所提电源快速切换控制策略及参数计算的正确性和有效性。%As an important load of naval vessels, electric plants and steel plants, induction motor should be switched rapidly from main source to alternative source after its power outages. However, the transient inrush produced by such dynamic load under the adverse conditions would have serious consequences. Accordingly, a novel rapid power switching control strategy of induction motor load was proposed based on solid state transfer switch (SSTS) in this paper. The proposed strategy could not only rapidly transfer the critical load from main source to alternative source, but also effectively suppress the transient inrush under the condition of the various phase-angle differences between the two sources. Then, the complex transient of induction motor during the switching control process of the alternative source was analyzed. And the main factors affecting the suppression of the transient inrush were discussed. Besides, the relationship between control parameters and current peak values was explained when the phase-angle difference between the two sources was known. The control parameters could be obtained by the requirement of the current-limit suppression. Finally, the calculation and test results of the stator currents verified that the proposed rapid power switching strategy and the parameters calculation were correct and effective.
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