When the permanent magnet synchronous machine (PMSM) based electric vehicles (EV) are in the postcrash situations, the dc-bus capacitor voltage requires to be reduced quickly for the sake of electric shock risk prevention. Currently, due to the advantages of low cost, compact structure, and high reliability, the pure-winding-based discharge strategies are attracting increasing attentions. However, there are no theoretical criteria for judging whether a pure-winding-based method is suitable for bleeding a particular PMSM-based EV drive, not to mention the rules for opting for an effective discharge strategy among the instant nonzero d-axis, zero q-axis (NDZQ), long-cycle NDZQ, and the nonzero d-axis, nonzero q-axis (NDNQ) current control techniques. This article discusses the applicable occasions of the instant NDZQ, long-cycle NDZQ, and NDNQ discharge methods based on parametric analysis. On this ground the principles for determining whether an EV drive can adopt a pure-winding-based method for discharge are given. Meanwhile, the implementation procedures of the proposed criteria are detailed clearly. Finally, the proposed selection criteria are used for evaluating five different EV drives so as to select the corresponding winding-based discharge strategy for each system, and the effectiveness is verified by simulation or experiments.

中文翻译：

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基于参数分析的基于绕组的直流母线电容器放电技术选择原则适用于 EV-PMSM 驱动器的碰撞后条件

当基于永磁同步电机（PMSM）的电动汽车（EV）处于碰撞后情况时，为了防止触电风险，需要迅速降低直流母线电容器电压。目前，基于纯绕组的放电策略由于具有成本低、结构紧凑、可靠性高等优点而受到越来越多的关注。然而，没有理论标准来判断基于纯绕组的方法是否适用于特定的基于 PMSM 的 EV 驱动器，更不用说在瞬时非零 d 轴、零之间选择有效放电策略的规则。 q 轴 (NDZQ)、长周期 NDZQ 和非零 d 轴、非零 q 轴 (NDNQ) 电流控制技术。本文讨论瞬时NDZQ、长周期NDZQ、和基于参数分析的 NDNQ 放电方法。在此基础上，给出了确定电动汽车驱动器是否可以采用基于纯绕组的放电方法的原则。同时，明确了拟议标准的实施程序。最后，将所提出的选择标准用于评估五种不同的电动汽车驱动器，以便为每个系统选择相应的基于绕组的放电策略，并通过仿真或实验验证其有效性。