Impact of mismatch cables impedances on active motor terminal overvoltage mitigation using parallel voltage source inverters
Impact of mismatch cables impedances on active motor terminal overvoltage mitigation using parallel voltage source inverters
复制标题
电缆阻抗失配对使用并联电压源逆变器主动缓解电机端子过压的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
C. Sartori
中科院分区：
文献类型：
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作者：
Daniel de Paula dos Santos;C. Sartori
由于高速开关电源和长电缆长度，未经处理的瞬态电动机端子过电压可能是原始电源电压幅度的两倍。在某些情况下，这种过电压会导致电机绝缘过早失效。工业上广泛应用的一种拓扑结构是这种过电压的主题：由电压源逆变器驱动的电动机，由长馈电电缆连接。有几种无源方法可以有效地缓解过电压，但大多数方法都是基于有损耗和体积庞大的无源元件滤波器。提出了一种不同的方法，通过两个低损耗的有源方法来缓解简单的拓扑结构的过电压。它包括使用具有特定开关策略的电压源逆变器，以衰减过电压的主要原因：电机端子处的行进反射脉冲的叠加。作为一种有前途的过电压缓解方法，必须对其特殊性进行一些具体的研究，以清楚地了解其所有优点和可能的缺点。本文讨论了这些过电压缓解方法的脆弱性，一些内部参数的变化。电缆阻抗变化的影响，由于加热-和阻抗失配-是突出的，因为它是固有的系统，可以降低过电压缓解。
Non-treated transient motor terminal overvoltage due high-speed switching sources and long cable length can be twice the original source voltage amplitude. In some cases, this overvoltage can cause premature motor insulation failure. A topology widely applied in industry is subject of this overvoltage: motors driven by voltage source inverter, connected by long feeding cable. There are several passive methods effective in mitigating overvoltage, but most of them are based in lossy and bulky passive component filters. A different approach is proposed by two low loss active methods for overvoltage mitigation with simple topologies. It consists in using voltage source inverters with specific switching strategy in order to attenuate the main cause of overvoltage: the superposition of traveling reflected pulses at the motor terminals. As promising methods for overvoltage mitigation, some specific studies regarding its particularities must be carried on in order to clear understand all its benefits and possible drawbacks. The present paper discusses the vulnerability of these overvoltage mitigation methods to some internal parameter variation. The impact of cables impedance variation due heating — and impedance mismatch-is highlighted, since it is intrinsic to the system and can degrades overvoltage mitigation.