Multi-voltage grade direct current grid system and control protection method

A multi-voltage level, DC power grid technology, applied in DC network circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the problem of small DC system line impedance and DC bus voltage. Pull low, limited overcurrent capacity and other issues, to achieve the effect of reducing the rate of change of fault current, improving the success rate, and low cost

Active Publication Date: 2018-11-23
NR ELECTRIC CO LTD +1
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  • Claims
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Problems solved by technology

[0002] In recent years, the application range of DC grid technology has become more and more extensive. Due to the introduction of a large number of power electronic converters, the operation mode of DC grid is more flexible and more complex. How to effectively ensure the reliability of DC grid operation has become a limiting DC power grid. The bottleneck of network development: due to the small line impedance of the DC system, once a short-circuit fault occurs, on the one hand

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  • Multi-voltage grade direct current grid system and control protection method
  • Multi-voltage grade direct current grid system and control protection method
  • Multi-voltage grade direct current grid system and control protection method

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Embodiment Construction

[0051] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0052] A multi-voltage level direct current power grid system, the direct current power grid system has at least one direct current transformer, at least two direct current buses and at least one outgoing current limiter;

[0053] One end of the DC transformer is connected to the first DC bus, and the other end is connected to the second DC bus to realize DC voltage conversion; the outlet current limiter includes a set of DC switches and a first bypass switch, a first limiter The first current limiting unit is formed by connecting the current resistance units in parallel. One end of the outlet current limiter is connected to the DC bus, and the other end is connected to the outlet.

[0054] Such as figure 1 As shown, the DC power grid system in this embodiment includes 2 DC transformers, 2 DC buses, 2 outgoing current limiters, and three o...

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Abstract

The invention discloses a multi-voltage grade direct current grid system. The direct current grid system comprises at least one direct current transformer, at least two direct current buses and at least one outgoing line current limiter. One end of the direct current transformer is connected with a first direct current bus, and the other end of the direct current transformer is connected with a second direct current bus, so that the conversion of direct current voltage is realized. The outgoing line current limiter comprises a group of direct current switches and a first current limiting unit,wherein the first current limiting unit is composed of a first by-pass switch and a first current limiting resistance unit. The invention further comprises a control protection method of the multi-voltage grade direct current grid system, when a bus or an outgoing line of a direct current grid is in a short-circuit fault, a current limiting resistance unit comes into service rapidly, short-circuit current is reduced, and the voltage of the bus is maintained to be normal, so that the fault ride-through is realized, and the operational reliability of the direct current grid is greatly improved.

Description

technical field [0001] The invention belongs to the field of power electronic converters, and in particular relates to a multi-voltage level DC power grid system and a control and protection method. Background technique [0002] In recent years, the application range of DC grid technology has become more and more extensive. Due to the introduction of a large number of power electronic converters, the operation mode of DC grid is more flexible and more complex. How to effectively ensure the reliability of DC grid operation has become a limiting DC power grid. The bottleneck of network development: due to the small line impedance of the DC system, once a short-circuit fault occurs, on the one hand, the short-circuit current rises very fast, and the power electronic converter is composed of power semiconductors, and the overcurrent capability of power semiconductor devices is limited. The current will cause damage or blockage of the converter; on the other hand, the short-circu...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H9/02
CPCH02H7/268H02H9/02H02J1/082H02J1/00H02H7/26H02H1/0007
Inventor 谢晔源李海英王宇张中锋曹冬明
Owner NR ELECTRIC CO LTD
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