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A Current-Limiting Protection Strategy for the Combined Three-Phase Inverter

机译:组合式三相逆变器的限流保护策略

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摘要

For the medium or low voltage high-current applications, combined three-phase inverter topology is presented and mathematical model in dq coordinates is built. Several current-limiting methods are commonly used. They have their own shortcomings. Thus, a new strategy of hardware blockage with instantaneous currents, combined by software current limit with the average current is presented. Using fast response of hardware circuit, current will be reduced to a certain scope. Then, software current limit is working in TMS320LF2407 control chip. Considering a short-circuit circumstances, many waveforms were received from the 400 KVA 50HZ experimental machine. The experimental results show that the method not only ensures safe operation, but also improves dynamic capability and reduces the distortion of the waveform.
机译:针对中压或低压大电流应用,提出了组合式三相逆变器拓扑结构,并在dq坐标下建立了数学模型。通常使用几种限流方法。他们有自己的缺点。因此,提出了一种通过瞬时电流将硬件阻塞的新策略,并结合软件电流限制和平均电流。利用硬件电路的快速响应,电流将减小到一定范围。然后,软件电流限制在TMS320LF2407控制芯片中起作用。考虑到短路情况,从400 KVA 50HZ实验机接收到许多波形。实验结果表明,该方法不仅可以保证安全运行,而且可以提高动态性能,减少波形失真。

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