Synchronous soft-start networking control strategy of EMU parallel auxiliary converter
一种辅助变流器、控制策略的技术,应用在机动车、程序控制、电动汽车等方向,能够解决支撑电容过压或输出过流、输出电压幅值、相差差异大、容量有限等问题,达到减小并联入网冲击、增强PQ下垂作用、拓宽均流控制范围的效果
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Embodiment 1
[0092] Network normal mode:
[0093] 1. General parallel networking strategy: the output of the first auxiliary converter establishes the bus voltage, and then the non-first auxiliary converters are sequentially phase-locked and merged into the bus grid.
[0094] as attached Image 6 As shown in the figure, it is the test waveform of the startup process of the general networking strategy. Among them, CH1 is the 1-line voltage output by the first auxiliary converter, CH2 is the same-line voltage of the non-first auxiliary converter, and CH3 is the parallel output current of the non-first auxiliary converter. As can be seen:
[0095] 1) The start-up of the auxiliary converter is a bullet-type amplitude soft-start process, and the start-up time is 2s.
[0096] 2) The integration of non-first auxiliary converters must meet the grid connection conditions: the voltage amplitude, frequency and phase and the bus voltage deviation are within the set deviation range. Generally, when...
Embodiment 2
[0106] Working condition 1: In the emergency traction mode, the first auxiliary converter and the non-first auxiliary converter in the soft start are connected in parallel.
[0107] 1) During the soft start, it is not the first one to perform bus voltage tracking through fast networking logic;
[0108] 2) Complete the fast tracking of the first bus voltage amplitude, phase and frequency through the bus fast tracking strategy;
[0109] 3) After being connected to the network, through the PQ drooping control strategy, the parallel current sharing during the soft start process can be quickly realized.
[0110] as attached Figure 8 As shown, CH1 is the 1-way voltage output by the first unit, CH2 is the same-line voltage of the non-first unit, and CH3 is the parallel output current of the non-first unit. In working condition 1, through the networking strategy of the present invention, it can be guaranteed that the networking is completed in soft start, and the networking time of...
Embodiment 3
[0112] Working condition 2: In emergency traction mode, multiple converters are the first auxiliary converter.
[0113] 1) A relatively lagging converter, when the first one is closed to the bus, quickly switches to the non-first auxiliary converter through fast networking logic;
[0114] 2) Through the fast tracking strategy of the bus, before the mechanical delay of the contactor arrives, the voltage amplitude, frequency and phase of the bus are approached to the greatest extent;
[0115] 3) After being connected to the network, through the PQ drooping control strategy, the parallel current sharing during the soft start process can be quickly realized.
[0116] as attached Figure 9 As shown, CH1 represents the output line voltage of converter 1, CH2 represents the same output line voltage of converter 2, and CH3 represents the output current of converter 2. When both converters are identified as the first converter, there is a mechanical action delay of about 40ms due to ...
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