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1. 发明公开

EP3306813A1 POWER CONVERSION DEVICE 有权
标题翻译：电力转换装置
公开(公告)号：EP3306813A1
公开(公告)日：2018-04-11
申请号：EP16802838.9
申请日：2016-02-01
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： KAGEYAMA Hiroshi , IBORI Satoshi , SASAKI Yasushi , TOMIYAMA Kiyotaka
IPC分类号： H02P29/024 , H02P27/06
CPC分类号： H02P27/06 , G01R31/025 , G01R31/343 , H02H7/1227 , H02P29/027 , H02P29/032
摘要： In a case where operation of a power conversion apparatus stops due to occurrence of a short circuit malfunction, a user cannot specify a point where a short circuit occurs, that is, whether or not the short circuit malfunction occurs on a cable, or whether or not the short circuit malfunction occurs within a motor. Provided is a power conversion apparatus that includes a plurality of switching elements and that drives a motor which is connected through a cable, by performing control that turns on and off the plurality of switching element, the apparatus including: an inverter circuit that is configured with a plurality of switching elements that are upper arms for controlling current for a motor and a plurality of switching element that are lower arms; and a determination unit that determines a short circuit point, in which, when an inter-phase short circuit point that occurs in the motor and the cable is inspected, the determination unit causes short circuit current to be generated by turning on the switching elements that are one upper arm and one lower arm which are in different phases, at the same time, and, based on current increasing speed when a short circuit occurs and a current decreasing speed after the short circuit occurs, determines a short circuit point.
摘要翻译：在由于发生短路故障而使电力转换设备的操作停止的情况下，用户不能指定发生短路的点，即，电缆上是否发生短路故障，或者是否不是电动机内发生短路故障。提供一种电力转换装置，其包括多个开关元件，并且通过执行控制以打开和关闭多个开关元件来驱动通过电缆连接的电机，所述装置包括：逆变器电路，其配置有多个开关元件，所述开关元件是用于控制电动机的电流的上臂和作为下臂的多个开关元件; 以及确定单元，其确定短路点，其中，当检测到发生在所述电动机和所述电缆中的相间短路点时，所述确定单元通过导通所述开关元件来产生短路电流，所述短路电流是同时处于不同相位的一个上臂和一个下臂，并且基于发生短路时的电流增加速度和发生短路后的电流下降速度来确定短路点。

2. 发明公开

EP3595159A1 POWER CONVERSION DEVICE AND GROUND FAULT LOCATION DETERMINATION METHOD 有权
公开(公告)号：EP3595159A1
公开(公告)日：2020-01-15
申请号：EP18764704.5
申请日：2018-02-28
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： KAGEYAMA Hiroshi , UCHINO Yoshihiro , SASAKI Yasushi
IPC分类号： H02M7/48 , H02P27/06 , H02P29/024
摘要： According to the present invention, a low speed current sensor is used to determine where, among a motor and a cable connected to a power conversion device, a short circuit has occurred.
In addition, the low speed current sensor is used to specify an interphase short circuit location on the cable with high resolution. When a direct current voltage value is a predetermined value lower than the value when a motor is being driven, the switch elements, one of which is on an upper arm and the other one of which is on a lower arm of a different phase than the upper arm, are turned on to generate in the cable, a current for short circuit investigation. Thereafter, while one of the switch elements is turned off, a current measurement value is obtained from the current sensor. On the basis of the time when both the switch elements were turned on and a current measurement value of the current sensor, a round-trip inductance value of a cable is calculated, and a short circuit location is determined from the inductance value.

3. 发明公开

EP3264582A1 POWER CONVERSION DEVICE AND CONTROL METHOD THEREFOR 审中-公开
标题翻译：电力转换装置及其控制方法
公开(公告)号：EP3264582A1
公开(公告)日：2018-01-03
申请号：EP15883225.3
申请日：2015-02-26
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： SASAKI Yasushi , IBORI Satoshi , TOMIYAMA Kiyotaka
IPC分类号： H02M7/48
CPC分类号： H02M7/48 , H02M7/53871 , H05K7/20945
摘要： Provided is a power conversion device that can be stably operated even when a wide-bandgap semiconductor element is operated at a high temperature. Further provided is a control method for the power conversion device. This power conversion device is provided with: a rectifier that converts alternating-current power to direct-current power; an intermediate circuit that smooths the direct-current power converted by the rectifier; an inverter that converts the direct-current power smoothed by the intermediate circuit into alternating-current power; a driving circuit that drives the inverter; a control unit that controls the driving circuit; a temperature detection unit that detects the temperature of the inverter; and a sealing material that seals at least the inverter. The control unit integrates the operation time that the power conversion device continues to operate at a temperature detected by the temperature detection unit, and, on the basis of the relationship between the integrated operation time, the detected temperature, and the permitted operation time of the power conversion device, determines whether to suppress the output of the power conversion device or to stop the operation of power conversion device.
摘要翻译：本发明提供一种功率转换装置，即使宽带隙半导体元件在高温下工作，也能够稳定地工作。还提供了用于电力转换装置的控制方法。该电力变换装置具备：将交流电力变换为直流电力的整流器; 平滑由整流器转换的直流电力的中间电路; 逆变器，其将通过中间电路平滑的直流电力转换为交流电力; 驱动逆变器的驱动电路; 控制单元，其控制驱动电路; 温度检测单元，其检测逆变器的温度; 以及至少密封逆变器的密封材料。控制单元将电力转换装置继续运行的运行时间积分在由温度检测单元检测到的温度下，并且基于积分运行时间，检测到的温度和运行时间的允许运行时间之间的关系电力转换装置，确定是抑制电力转换装置的输出还是停止电力转换装置的操作。

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