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Thermal test method for high power three-phase grid-connected inverters

机译：大功率三相并网逆变器的热试验方法

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摘要

Semiconductor device junction temperatures are maintained within datasheet specified limits to avoid failure in power converters. Burn-in tests are used to ensure this. In inverters, thermal time constants can be large and burn-in tests are required to be performed over long durations of time. At higher power levels, besides increased production cost, the testing requires sources and loads that can handle high power. In this study, a novel method to test a high power three-phase grid-connected inverter is proposed. The method eliminates the need for high power sources and loads. Only energy corresponding to the losses is consumed. The test is done by circulating rated current within the three legs of the inverter. All the phase legs being loaded, the method can be used to test the inverter in both cases of a common or independent cooling arrangement for the inverter phase legs. Further, the method can be used with different inverter configurations – three- or four-wire and for different pulse width modulation (PWM) techniques. The method has been experimentally validated on a 24 kVA inverter for a four-wire configuration that uses sine-triangle PWM and a three-wire configuration that uses conventional space vector PWM.
机译：半导体器件的结温保持在数据手册规定的限制内，以避免功率转换器发生故障。老化测试用于确保这一点。在逆变器中，热时间常数可能很大，并且需要长时间进行老化测试。在更高的功率水平下，除了增加生产成本外，测试还需要能够处理高功率的电源和负载。在这项研究中，提出了一种测试大功率三相并网逆变器的新方法。该方法消除了对高功率源和负载的需求。仅消耗与损耗相对应的能量。通过在变频器的三个支路中循环额定电流来完成测试。在所有相脚都已加载的情况下，该方法可在逆变器相脚共用或独立冷却两种情况下用于测试逆变器。此外，该方法可用于不同的逆变器配置（三线或四线），并用于不同的脉冲宽度调制（PWM）技术。该方法已经在24 kVA逆变器上进行了实验验证，该逆变器适用于使用正弦三角形PWM的四线配置和使用常规空间矢量PWM的三线配置。

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