(EN)
A multi-level PWM inverter control device capable of safely switching from normal operation to protection operation and safely and smoothly returning to the normal operation from the protection operation without requiring a complicated algorithm. When the measured current value I is equal to or greater than a first reference value I1 and smaller than a second reference value I2, a zero vector starting from the OOO state at which intermediate potential is output for all the phases is output (step 22). When the current value I is equal to or greater than the second reference value I2 and smaller than a third reference value I3, after the zero vector is output, a base block operation for turning off all the switching elements is performed (step 28). When the current value I becomes greater than the third reference value I3, an emergency stop is performed (step 29). When returning to the normal operation after performing the base block, the zero vector output operation is performed before returning to the normal operation.
(ZH) 本发明提供一种PWM逆变器控制装置和控制方法，在多电平PWM逆变器控制装置中，无需复杂的控制算法，安全地进行从正常动作向保护动作的切换，安全且平滑地进行从保护动作向正常动作的复原。在本发明中，当测得的电流值I大于等于第1基准值I1而小于第2基准值I2时，输出从000状态开始的零矢量，该000状态是指全部相输出中间电位的状态(步骤22)。当电流值I大于等于第2基准值I2而小于第3基准值I3时，在输出零矢量后进行使全部开关元件处于关断状态的基极阻断动作(步骤28)，当电流值I大于等于第3基准值I3时，进行紧急停止(步骤29)。在进行基极阻断动作之后向正常动作复原时，在进行零矢量的输出动作之后进行向正常动作的复原。
