Abstract: A computing device obtains a correspondence between a peripheral component interconnect express (PCIE) device identifier and an identifier of a port on the computing device, and the correspondence is persistent in the computing device. Then, the computing device determines a first port that connects a first PCIE device to the computing device, and allocates a first PCIE device identifier to the first PCIE device based on a first identifier of the first port and the obtained correspondence. Because the computing device allocates identifiers to PCIE devices based on the persistently stored correspondence between the identifier of the port and the PCIE device identifier, the computing device allocates same identifiers to the PCIE devices every time, so that the identifiers allocated to the PCIE devices are constant, thereby preventing the identifiers allocated by the computing device to the PCIE devices from changing and affecting access of services run on the computing device to the PCIE devices.

Abstract: The motherboard includes a basic computing unit and an extension unit. The basic computing unit is provided with a basic component and an external interface. The extension unit is configured to extend a function of the basic computing unit. The basic computing unit is coupled to a second external interface of the extension unit through a first external interface on the basic computing unit. A conventional motherboard is split, and a basic computing unit that includes only a processor subsystem and an extension unit that extends input/output and management are formed by properly dividing the processor subsystem and a peripheral system. Impact of an extension component on the basic computing unit is reduced, and the extension component can be flexibly replaced based on an actual requirement.

Abstract: This disclosure provides a PSR-PWM technique for high power active front-end inverters to damp a specific inter-harmonic that may cause relative sub-synchronous resonance in power system. Due to the strong interaction between wind power converters, photovoltaic converters, FACTS devices and HVDC transmission, low-frequency oscillations occur from a few Hz to dozens of Hz, or even high-frequency oscillations ranging from about 300-2000 Hz. Meanwhile, low-frequency oscillations ranging from 0.6 Hz to 7 Hz occur in the power supply systems of many electric locomotives. Even in the case of large-scale train outage, low-frequency oscillation will lead to abnormal locomotive dispatching system; in addition, the power grid voltage disturbance and flicker caused by a large number of high-power are furnaces and other nonlinear loads in the industrial field with a passband inter-harmonic frequency ranging from 0.05 Hz-90 Hz and so on are detected.

Abstract: This disclosure provides a PSR-PWM technique for high power active front-end inverters to damp a specific inter-harmonic that may cause relative sub-synchronous resonance in power system. Due to the strong interaction between wind power converters, photovoltaic converters, FACTS devices and HVDC transmission, low-frequency oscillations occur from a few Hz to dozens of Hz, or even high-frequency oscillations ranging from about 300-2000 Hz. Meanwhile, low-frequency oscillations ranging from 0.6 Hz to 7 Hz occur in the power supply systems of many electric locomotives. Even in the case of large-scale train outage, low-frequency oscillation will lead to abnormal locomotive dispatching system; in addition, the power grid voltage disturbance and flicker caused by a large number of high-power are furnaces and other nonlinear loads in the industrial field with a passband inter-harmonic frequency ranging from 0.05 Hz-90 Hz and so on are detected.