A flexible DC distribution network integrated protection system
A flexible DC power distribution and protection system technology, applied in the field of distribution network, can solve the problems of small inertial time constant, fast rising rate of short-circuit current, and high requirements for fast fault removal, so as to ensure safe and reliable operation and improve reliability Effect
Active Publication Date: 2018-12-14
JIANGSU ELECTRIC POWER CO +1
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Problems solved by technology
[0004] However, due to the extremely small inertia time constant of the power balance of the flexible DC distribution network, the short-circuit current rises rapidly when a fault occurs, and the requirements for fast fault removal are extremely high
Therefore, the protection technology for the overcurrent or short circuit fault of the flexible DC distribution network is still blank in the prior art.
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[0030] An embodiment of the present application provides an integrated protection system for a flexible DC distribution network.
[0031] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0032] figure 1 It is a schematic diagram of the module structure of an embodiment of a protection control system for a distribution network converter station described in this application. Although the pres...
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The invention provides a flexible DC distribution network integrated protection system. The system comprises: a current signal input module, comprising eight paths of signal input ends used for collecting six paths of bridge arm currents, positive electrode DC current and negative electrode DC current; a field programmable gate array communicating with the current signal input module and synchronously acquiring the current values of the bridge arm current, the positive electrode DC current and the negative electrode DC current, and transmitting the current values to the ARM processor at regular intervals, wherein the field programmable gate array is used for generating an outlet control command according to the current values, and transmitting the outlet control command to the valve-basedcontroller; the valve-based controller for controlling lock-up and trip of the converter valve; and an ARM processor that communicates with the in-station monitoring system, communicates with the field programmable gate array and shares the stored information. By use of various embodiments of the present application, fast and accurate protection control of the bridge arm and inter-pole short circuit faults of the flexible DC distribution network converter station can be achieved.
Description
technical field [0001] The application relates to the field of distribution network technology, in particular to an integrated protection system for a flexible DC distribution network. Background technique [0002] The flexible DC distribution network is based on voltage sourced converters (voltage sourced converters -VSC) technology, using converter equipment composed of IGBTs and other thyristors with the ability to turn off the current, and realizing passive rectification and inverter through pulse modulation technology. A power distribution system that sends DC current to loads. This system has many incomparable advantages of traditional AC power distribution, making it the most potential power transmission method recently developed, especially suitable for new energy grid connection, construction of urban DC distribution network, and remote small load areas. Power supply and other fields have broad application prospects. [0003] The protection system of flexible DC...
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IPC IPC(8): H02H7/26H02H3/087
CPCH02H3/087H02H7/262H02H7/268
Inventor 袁栋付慧金雪牛永会李石鹿洪刚冯志畅陈东
Owner JIANGSU ELECTRIC POWER CO