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

Haier Smart Home Co., Ltd.

Qingdao Haier Air-conditioning Electronic Co., Ltd.

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

Qingdao Borui Zhiyuan Anti-vibration Technology Co., Ltd.

Bo Zhang

Bo Li

Zhenzong Zhu

Meiyun Li

Shen Wang

Yongjie Mao

Wendong Ji

Qingwen Sun

Junbo Zhao

Bin Shi

Yu Wang

Lijun Zhang

Yang Zhou

Dongjun Yang

Junlei Wei

Zhaoping Li

Xiaoming Zhang

Zheng Xie

Yanfang Zhang

Yunlong Liu

Anping Cong

Haizhu Shao

Xuebin Xing

Yan Geng

Xianghui Hu

Congcong Wang

Yufei Chen

Guodong Wang

Hongguang Song

Peng Su

Wanqiang Liu

Zhiguo Liu

Devices are provided for field weakening control of a compressor, including the compressor and a main circuit unit providing power for the compressor. The devices include a compressor rotational speed obtaining unit, and a control unit that compares the rotational speed &#x3c9; of the compressor with a rotational speed threshold &#x3c9;of the compressor, and controls the main circuit unit according to comparison results. When the rotational speed &#x3c9; is less than &#x3c9;, an output voltage of the main circuit unit is controlled at a fixed value. When the rotational speed &#x3c9; is greater than or equal to &#x3c9;, the compressor is controlled not to enter the field weakening control temporarily and the output voltage of the main circuit unit is controlled to rise, the compressor is controlled to enter the field weakening control when the output voltage of the main circuit unit cannot continue to rise.

Device and method for field weakening control of compressor, air conditioner and storage medium

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

A system and a method for parallel power supply control for auxiliary converters of a motor train unit in the presence of interconnecting lines. The system comprises multiple three-phase inverter modules. The multiple three-phase inverter modules are in parallel connection with each other. Any two-phase circuit of a three-phase inverter module is separately in parallel connection with a corresponding two-phase circuit of a three-phase inverter module adjacent to the three-phase inverter module by using a connecting line module. The connecting line module is connected to a control system. The three-phase inverter modules are also connected to the control system. The three-phase lines of the three-phase inverter modules are all provided with switches. Less interconnecting lines are used, and any two phases of the three-phase inverter modules are separately in parallel connection, and therefore, stable power supply is achieved by balancing currents of any two phases of the three-phase circuits, and the system reliability is improved.

System and method for parallel power supply control for auxiliary converters of motor train unit in presence of interconnecting lines

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Qingdao, China

Bo Zhang