Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd.

Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd. (cn)

Qingwen Sun

Bo Zhang

Shen Wang

Wendong Ji

Yongjie Mao

Meiyun Li

Junbo Zhao

Zhenzong Zhu

Yu Wang

Bo Li

Yunlong Liu

Xuebin Xing

Congcong Wang

Yufei Chen

A synchronous soft-start networking control strategy for parallel auxiliary converters of EMU, that is, when a first auxiliary converter is connected to the bus, non-first auxiliary converters complete the networking during an amplitude soft-start process of the first auxiliary converter. Specific solution is: fast networking logic, bus fast-tracking logic and PQ droop networking control strategy. Wherein, the fast networking logic comprises recognizing the first auxiliary converter and the non-first auxiliary converter; the bus fast-tracking logic comprises tracking phase, frequency and amplitude; the PQ droop networking control strategy comprises introducing a correction coefficient K. The synchronous soft-start networking control strategy for the parallel auxiliary converters of EMU can realize quickly and reliably automatic networking in an emergency traction mode of EMU, and significantly shorten networking time in a network normal mode of EMU. Therefore, it can ensure that EMU can complete startup loading within a specified time under various working conditions, which provides strong guarantee for stable and reliable operation of EMU.

Synchronous soft-start networking control strategy for parallel auxiliary converters of EMU

A parallel control method and a parallel control system for single-phase inverters and an inverter. Acquiring an output voltage and an output current of each of the single-phase inverters; transforming a voltage and a current in static abc coordinates into dq coordinates by reconstruction and coordinate transformation so as to realize decoupling of the voltage and the current; transforming an output voltage command value of a current loop in dq coordinates into abc coordinates by coordinate transformation; and modulating and generating modulation waves according to an output voltage command value in abc coordinates to control a switching of a power device. In the present application, a plurality of single-phase inverters are controlled to be connected in parallel and are simultaneously started to work, after one of the single-phase inverters is faulted, any other single-phase inverter automatically bears the load of the faulted single-phase inverter, so that a problem of restarting delay of a mutual backup module is solved, a real uninterrupted power supply of the power supply is realized, high reliability is achieved, and influences to vehicle driving are avoided.

Parallel control method and system for single-phase inverters and inverter

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Qingwen Sun