A synchronous closing control method of a metro brake feedback converter
A brake feedback and control method technology, applied in the direction of single-net parallel feeding arrangement, etc., can solve the problems of high cost and large volume of the brake feedback system, and achieve the effect of avoiding use and reducing costs
Active Publication Date: 2019-01-15
XIAN XJ POWER ELECTRONICS TECH +2
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Problems solved by technology
[0006] The purpose of the present invention is to provide a synchronous closing control method for a subway brake feedback converter to solve the problems of excessive volume and high cost of the current brake feedback system
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Embodiment 1
[0022] Such as figure 2 Shown is the control flow chart of the synchronous closing of the subway brake feedback converter in the embodiment of the present invention.
[0023] In view of the technical requirements for the closing operation of the DC contactor of the subway feedback converter, the synchronous closing control of the subway brake feedback converter in this embodiment is specifically as follows:
[0024] 1. Detect whether the starting signal of the regenerative converter is received, and if the starting signal of the regenerative converter is received, perform the following synchronous closing control steps;
[0025] In practical applications, when the sampling voltage of the DC catenary reaches or exceeds the brake feedback startup threshold, the system will send a startup signal for the feedback converter. The brake feedback startup threshold can be set according to actual needs. In this embodiment, it is set to 1500V.
[0026] 2. After receiving the starting ...
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The invention relates to a synchronous closing control method of a metro brake feedback converter, belonging to the field of metro power supply control. The synchronous closing control comprises the following steps: after receiving the start signal of the feedback converter, controlling the AC side of the feedback converter to close; If the difference between the DC-OCS voltage and the DC-side voltage of the feedback converter is less than the set threshold, the DC-side voltage of the feedback converter is directly switched on. If the difference between the DC-OCS voltage and the DC-side voltage of the feedback converter is greater than or equal to the set threshold, The feedback converter is controlled to perform DC synchronous voltage stabilization operation on the DC side voltage of thefeedback converter, so that the difference between the DC contact voltage and the DC side voltage of the feedback converter is smaller than a set threshold value, and then the feedback converter enters the DC side switching-on operation of the feedback converter. The invention ensures that the DC contactor closes without impact through a software control algorithm, avoids the use of the DC soft start loop, and reduces the volume of the brake feedback system and the cost of hardware.
Description
technical field [0001] The invention relates to a synchronous closing control method of a subway brake feedback converter, belonging to the field of subway power supply control. Background technique [0002] With the rapid development of the economy and the acceleration of urbanization, urban rail transit has developed rapidly in recent years. The subway has become an effective means of alleviating urban traffic congestion with a series of advantages such as large capacity, fast speed and land saving. A large amount of braking energy will be generated during the operation of the subway, and the excess energy will be consumed by resistors, which will not only fail to save energy, but will also increase the burden on the ventilation and cooling system of urban rail transit lines. A reasonable braking energy absorption scheme can not only alleviate the temperature rise of the tunnel It can also produce good comprehensive economic benefits through the secondary utilization of en...
Claims
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IPC IPC(8): H02J3/40
CPCH02J3/40
Inventor 郜亚秋耿志清柳拉勋李宪鹏郑月宾崔炳涛王林牛化鹏李亚军夏景辉刘宏泰郝晓平
Owner XIAN XJ POWER ELECTRONICS TECH