Low-voltage direct-current power distribution network fault processing system and method
A distribution network fault, low-voltage direct current technology, applied in the direction of fault location, voltage/current isolation, fault detection according to conductor type, etc., can solve the problem of weak DC distribution network protection means and methods, late start of DC distribution protection technology, Lack of practical experience and standards for DC power distribution systems, etc., to achieve the effect of improving rapid positioning and improving operation stability
Pending Publication Date: 2021-12-21
NARI TECH CO LTD +3
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Problems solved by technology
[0003] At present, the research on the control strategy, protection means and methods of DC distribution network is still very weak. Compared with the traditional AC distribution network, the protection technology of DC distribution network started late, and the relevant research is still in its infancy, and there is still a lack of a large number of researches. Practical experience and standards for protection configuration of DC power distribution system
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[0027] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0028] The basic topology of DC distribution network includes radial, two-end power supply and ring. Compared with the other two, the ring-shaped power distribution structure has higher power supply reliability and has gradually become the development trend of distribution network. figure 1 It is a schematic diagram of the structure of a typical ring-shaped DC distribution station. The distributed photovoltaic array generates DC power, and supplies power to DC loads through a DC chopper DC / DC with appropriate energy storage batteries and super capacitors. At the same time, it is converted into AC power, connected to the AC power distribution system. Here, the types of equipment are summarized as source equipment, network equipment and load equipment. Feeders connected to the busbar. Once a fault occurs, it can first be known whether it is a ...
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The invention provides a low-voltage direct-current power distribution network fault processing system and method. The system comprises an insulation monitoring device which is used for monitoring an insulation value at a specified position in a transformer area and uploading the insulation value to a local coordinated control device; a current and voltage monitoring device is used for monitoring voltage and current on each line in the power distribution network and sending the voltage and the current to the local coordinated control device; the local coordinated control device is arranged according to the transformer area and is used for carrying out local fault isolation according to the insulation data reported by the insulation monitoring device, controlling the on-off of all switches in the transformer area according to the current and voltage information, collected by the current and voltage monitoring device, on each line, and sending the fault information to a system coordinated control device; and the system coordinated control device is used for carrying out fault isolation confirmation and fault recovery according to the insulation fault information and the line fault information of all the transformer areas so as to complete the whole system recovery. According to the invention, the power supply recovery capability of the whole system after the fault and rapid positioning and isolation of the direct-current power distribution area when the fault occurs can be improved.
Description
technical field [0001] The invention belongs to the technical field of power system automation, and in particular relates to a low-voltage DC distribution network fault processing system and method. Background technique [0002] With the increasing number of DC loads such as electric vehicle charging stations, large data centers, and 5G communication equipment, and the massive access to DC distributed power sources such as wind energy and photovoltaics, the characteristics of current distribution network load source-storage DC are becoming more and more obvious. Compared with the AC power distribution system, the DC distribution network has better performance in terms of transmission capacity, system controllability and power supply quality, and the DC power distribution system also has obvious advantages in terms of power supply capacity, power supply radius, power supply quality and operating efficiency. , At the same time, the DC system also has many advantages such as no...
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Login to View More IPC IPC(8): G01R31/08G01R31/52G01R31/12G01R15/18G01R19/00
CPCG01R31/086G01R31/52G01R31/1272G01R15/18G01R19/00
Inventor 丁志宇黄堃赵景涛杨赫金雪葛卫梁温传新孙厚涛石春虎兰春虎韩忠修云阳柯贤杨
Owner NARI TECH CO LTD