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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

Active Publication Date: 2019-01-11
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the networking process of the auxiliary converter is equivalent to blind start. In order to quickly complete the networking within a limited time, there will be a situation of contention for the first unit, that is, the situation that multiple units are put into the bus at the same time as the first unit. At this time, due to multiple The output voltage amplitude and phase difference of the first converter connected to the bus bar are quite different, and multiple converters will be in a rectified state, resulting in overvoltage of the supporting capacitor or output overcurrent, and multiple converters will report faults and withdraw from the network At this time, the load of the whole vehicle has been put into use, and the converters left on the bus will be due to the small amount and limited capacity (it will take time for the faulty converters to be put into operation again), and eventually they will be shut down due to load overcurrent, resulting in failure to start the EMU

Method used

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  • Synchronous soft-start networking control strategy of EMU parallel auxiliary converter
  • Synchronous soft-start networking control strategy of EMU parallel auxiliary converter
  • Synchronous soft-start networking control strategy of EMU parallel auxiliary converter

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

A synchronous soft-start networking control strategy of EMU parallel auxiliary converter is disclosed. When that first auxiliary converter is put into bus bar, the non-first auxiliary converter synchronously completes networking and network connection during the first amplitude soft-start process. The specific scheme is as follows: fast networking logic, busbar fast tracking logic and PQ droop control strategy. The fast networking logic includes the identification of the first and non-first auxiliary converter, the busbar fast tracking logic includes phase, frequency and amplitude tracking, and the PQ droop control strategy includes the introduction of correction factor K. A synchronous soft-start networ control strategy of auxiliary converter of EMU can realize fast and reliable automaticnetwor of auxiliary converter in EMU emergency traction mode. In the normal mode of EMU network, the networking time can be significantly shortened. Therefore, the invention can ensure that the EMU can be started in a prescribed time under various working conditions, and provides a powerful guarantee for the stable and reliable operation of the EMU.

Description

technical field [0001] The present invention relates to the technical field of networking of converters for multiple trains, and in particular to a synchronous soft-start networking control strategy for parallel auxiliary converters of multiple trains. Background technique [0002] At present, the CRH1 / CRH3 EMUs used in batches in China and the newly developed Chinese standard EMUs have adopted the auxiliary converter output parallel redundant strategy. net, and load the load. [0003] 1) Network normal mode [0004] The networking strategy is: the network guides and controls one auxiliary converter as the first one, closes the output contactor, and after the three-phase power of the bus is established, the network guides other auxiliary converters to merge into the AC bus in turn. That is, the first station is established first, and then merged into the network in turn. [0005] 2) Emergency traction mode [0006] From the perspective of reliable operation of EMUs, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/40
CPCH02J3/40H02J13/00002B60L15/38B60L9/24B60L2200/26B60L2240/527Y04S10/126Y02T10/70Y02E60/00H02J3/001G05B19/042G05B2219/2639
Inventor 李博张波纪文东黎梅云孙庆文赵俊博朱真宗毛涌捷王珅王雨
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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