Method and apparatus for protection of dc power distribution systems
A technology of power distribution system and control device, which is applied in the field of DC power distribution system and can solve problems such as unreliability
Active Publication Date: 2019-08-30
ABB (SCHWEIZ) AG
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Problems solved by technology
In one aspect of these challenges, the steady-state fault currents in different branches and on different buses within a radial DC power distribution system can be very similar as a result of the low circuit impedance
Furthermore, fault location techniques that rely on current derivatives are unreliable in DC power distribution systems because, for example, as a result of the presence of energy storage devices or other energy resources at various locations in the system and RLC differences between branches, Different branches experience different transient current waveforms
Method used
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[0014] figure 1 One embodiment of a direct current DC power distribution system 10 referred to simply as a system or grid 10 is shown. System 10 includes a plurality of branch circuits 12 and provides power to a plurality of loads 14 . In the depicted example, system 10 includes multiple buses 16 , which may be understood to be staged because upstream buses 16 power downstream buses 16 via branch circuits 12 . Although not shown, system 10 receives power from a power supply system or network, eg, via a substation coupled to a transmission system.
[0015] The various branch circuits 12 include protective elements 20 which may be, in a non-limiting sense, fuses, mechanical switches, or power electronics operating as protective switches. At least some of these protective elements 20 are associated with and controlled by a control device 22 configured according to the teachings herein to trip the protective elements 20 or otherwise The protection element 20 is actuated in this...
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While transient current magnitudes at various locations within a DC power distribution system are not by themselves reliable indicators of fault location, it is recognized herein that accumulated energy or pseudo energy values provide a reliable basis for tripping protection elements at fault locations. Accordingly, in one aspect of the teachings herein, for each of the one or more protected branch circuits, a pseudo energy value is independently accumulated during a fault condition, and a defined pseudo energy value is reached in response to the accumulated pseudo energy value. An energy threshold to trip the protection element for each such branch circuit. A false energy threshold is defined such that the protection element in the branch circuit where the fault is located trips first.
Description
technical field [0001] The present invention relates generally to direct current DC power distribution systems, and in particular to protecting branches within a DC power distribution system. Background technique [0002] Recent improvements in the energy and power density of power electronic switches are developments that support the deployment and operation of DC power systems. DC power distribution systems have long been used in certain applications, such as in certain types of industrial plants, but they seek new opportunities in a variety of fields including shipboard power systems, photovoltaics and other types of renewable energy generation systems. and extended use. [0003] While DC power distribution systems provide many advantages in such scenarios, including reducing the amount or type of equipment required for power generation and / or conversion and improving efficiency, they also present a number of challenges. For example, it is recognized herein that challen...
Claims
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IPC IPC(8): H02H3/087H02H3/093H02H7/28
CPCH02H3/087H02H3/0935H02H7/28H02H7/268
Inventor 亓丽潘久平
Owner ABB (SCHWEIZ) AG