The paper presents an accurate analytical subdomain model for predicting the electromagnetic performance in the symmetrical dual three-phase surface-mounted permanent magnet synchronous machine(PMSM)under open-phase f...The paper presents an accurate analytical subdomain model for predicting the electromagnetic performance in the symmetrical dual three-phase surface-mounted permanent magnet synchronous machine(PMSM)under open-phase faulty conditions.The model derivations are extended from previous accurate subdomain models accounting for slotting effects.Compared with most conventional subdomain models for traditional three-phase machines with nonoverlapping winding arrangement,the subdomain model proposed in this paper applied for the 24-slot/4-pole dual three-phase machine with symmetrical overlapping winding arrangement.In order to investigate the postfault electromagnetic performance,the reconfigured phase currents and then current density distribution in stator slots under different open-circuit conditions are discussed.According to the developed model and postfault current density distribution,the steady-state electromagnetic performance,such as the electromagnetic torque and unbalanced magnetic force,under open-circuit faulty conditions are obtained.For validation purposes,finite element analysis(FEA)is employed to validate the analytical results.The result indicate that the postfault electromagnet performance can be accurately predicted by the proposed subdomain model,which is in good agreement with FEA results.展开更多
随着分布式能源与随机负荷的大量接入,配电台区三相负荷不平衡与变压器轻重载运行问题日益突出,这将威胁台区安全可靠运行。然而,既有关于互联台区的研究鲜有兼顾三相不平衡与轻重载运行问题的综合治理。对此,该文提出一种基于四桥臂智...随着分布式能源与随机负荷的大量接入,配电台区三相负荷不平衡与变压器轻重载运行问题日益突出,这将威胁台区安全可靠运行。然而,既有关于互联台区的研究鲜有兼顾三相不平衡与轻重载运行问题的综合治理。对此,该文提出一种基于四桥臂智能软开关(four-leg soft open point,F-SOP)的柔性互联配电台区三相不平衡与轻重载综合调控策略。首先,分析了F-SOP和变压器的综合损耗特性,结果表明不平衡度和负载率均会影响设备运行效率;其次,建立三相不平衡与轻重载综合调控策略模型,设立变压器输出功率不平衡度与负载率的指标约束,以系统综合损耗最小为优化目标求解F-SOP最优调控指令。接着,针对F-SOP拓扑架构及其功率调控的需求,提出一种改进对等控制方法,进一步提高F-SOP稳定性能与动态性能,确保综合调控策略的实现。最后,通过算例分析与仿真实验验证了所提综合调控策略的有效性和可行性。展开更多
基金supported in part by National Natural Science Foundation of China(NSFC)under Project No.51737010in part by State Key Laboratory of Electrical Insulation and Power Equipment(EIPE19109)。
文摘The paper presents an accurate analytical subdomain model for predicting the electromagnetic performance in the symmetrical dual three-phase surface-mounted permanent magnet synchronous machine(PMSM)under open-phase faulty conditions.The model derivations are extended from previous accurate subdomain models accounting for slotting effects.Compared with most conventional subdomain models for traditional three-phase machines with nonoverlapping winding arrangement,the subdomain model proposed in this paper applied for the 24-slot/4-pole dual three-phase machine with symmetrical overlapping winding arrangement.In order to investigate the postfault electromagnetic performance,the reconfigured phase currents and then current density distribution in stator slots under different open-circuit conditions are discussed.According to the developed model and postfault current density distribution,the steady-state electromagnetic performance,such as the electromagnetic torque and unbalanced magnetic force,under open-circuit faulty conditions are obtained.For validation purposes,finite element analysis(FEA)is employed to validate the analytical results.The result indicate that the postfault electromagnet performance can be accurately predicted by the proposed subdomain model,which is in good agreement with FEA results.
文摘随着分布式能源与随机负荷的大量接入,配电台区三相负荷不平衡与变压器轻重载运行问题日益突出,这将威胁台区安全可靠运行。然而,既有关于互联台区的研究鲜有兼顾三相不平衡与轻重载运行问题的综合治理。对此,该文提出一种基于四桥臂智能软开关(four-leg soft open point,F-SOP)的柔性互联配电台区三相不平衡与轻重载综合调控策略。首先,分析了F-SOP和变压器的综合损耗特性,结果表明不平衡度和负载率均会影响设备运行效率;其次,建立三相不平衡与轻重载综合调控策略模型,设立变压器输出功率不平衡度与负载率的指标约束,以系统综合损耗最小为优化目标求解F-SOP最优调控指令。接着,针对F-SOP拓扑架构及其功率调控的需求,提出一种改进对等控制方法,进一步提高F-SOP稳定性能与动态性能,确保综合调控策略的实现。最后,通过算例分析与仿真实验验证了所提综合调控策略的有效性和可行性。
