Fault ride-through device for true bipolar connection direct current transformer and control method
A DC transformer and fault ride-through technology, applied in the direction of DC network circuit devices, output power conversion devices, DC power input conversion to DC power output, etc., to improve the recovery speed, ensure safety, and facilitate the removal of short-circuit faults.
Pending Publication Date: 2022-03-01
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
The DC transformer with true bipolar connection faces the risks of positive-to-ground short-circuit, negative-to-ground short-c
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[0030]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0031] In the present invention, the terms "first", "second" and the like (if any) in the present invention and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
[0032] The application scenario of the fault ride-through device provided in this embodiment is a true bipolar DC transformer. Specifically, see figure 1 , the in...
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The invention discloses a fault ride-through device for a true bipolar connection direct-current transformer and a control method, and belongs to the field of direct-current converters, and the device comprises a positive pole fault ride-through unit which comprises a positive pole main branch, a positive pole follow current loop and a positive pole discharge branch, two ends of the positive main branch are respectively connected with a positive pole of a positive direct-current transformer output capacitor Cop and a positive load, two ends of the positive follow current loop are respectively connected with a negative pole of the Cop and the positive load, and two ends of the positive discharge branch are respectively connected with a negative pole of a negative direct-current transformer output capacitor Con and the positive load; and the cathode fault ride-through unit comprises a cathode main branch, a cathode follow current loop and a cathode discharge branch, two ends of the cathode main branch are respectively connected with the cathode and the cathode load of the Con, two ends of the cathode follow current loop are respectively connected with the anode and the cathode load of the Con, and two ends of the cathode discharge branch are respectively connected with the anode and the cathode load of the Cop. And various fault conditions of the low-voltage side when the direct-current transformer is provided with an electric load can be processed.
Description
technical field [0001] The invention belongs to the field of DC converters, and more specifically relates to a fault ride-through device and control method for a true bipolar-connected DC transformer. Background technique [0002] Compared with the traditional AC distribution system, the DC distribution network has lower transmission loss, higher reliability, and has a strong docking ability with distributed power, so it has received extensive attention. The end of the DC distribution network is a DC transformer with a voltage of ±10kV / ±375V, which needs to supply a wide variety of loads, covering various application scenarios such as industry, commerce, and civil use. In order to ensure the flexible access of various loads and distributed power sources, and ensure the stable and safe operation of each load, the DC transformer with true bipolar connection has become the first choice for DC distribution network. [0003] The short-circuit fault of DC transformer has the foll...
Claims
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Login to View More IPC IPC(8): H02M1/32H02M3/335H02J1/00
CPCH02M1/32H02M3/33523H02J1/00Y02E60/60
Inventor 张宇陈杨帆
Owner HUAZHONG UNIV OF SCI & TECH