Reactive compensation device

A technology of compensation device and valve group, applied in reactive power compensation, reactive power adjustment/elimination/compensation, circuit devices, etc. The effect of fast dynamic reactive power compensation, improving service life and safety, and reducing the number of compensation capacitors

Active Publication Date: 2016-10-12
石家庄赫伯孙电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing reactive power compensation devices are designed only considering the three-phase load balance of the power distribution system. However, the steel industry or railway power distribution system usually includes multiple three-phase unbalanced loads, such as electric arc furnaces, rolling mills or traction motors. , the power distribution system used in the iron and steel industry or for railway transportation is usually a three-phase unbalanced system, and the reactive power compensation power required by the three-phase unbalanced system is also unbalanced. Therefore, when using the existing reactive power compensation device for When it performs reactive power compensation, it will inevitably cause serious overcompensation of some busbar phases and serious undercompensation of the rest of the busbar phases
For example: the dynamic reactive power compensation capacity required between AB phases is 0.8Q, the dynamic reactive power compensation capacity required between BC phases is 0.8Q, and the dynamic reactive power compensation capacity required between CA phases is 0.5C. When the power compensation device compensates it, adjust the dynamic reactive power compensation capacity between the AB phases to 0.8Q, adjust the dynamic reactive power compensation capacity between the BC phases to 0.8C, and adjust the dynamic reactive power compensation capacity between the CA phases to 0.8C. Serious reactive power overcompensation occurs, and the dynamic reactive power compensation capacity between AB phases is adjusted to 0.5Q, the dynamic reactive power compensation capacity between BC phases is adjusted to 0.5C, and the dynamic reactive power compensation capacity between CA phases is adjusted to 0.5C, which will inevitably lead to AB, Serious undercompensation between BC phases occurs, and when reactive power compensation capacity is added to some undercompensated phases, due to the alternating fluctuation of reactive power compensation requirements between phases, multiple compensation capacitors are frequently put in and removed, which will inevitably affect the service life of capacitors

Method used

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Examples

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no. 1 example

[0016] figure 1 For the first embodiment of the present invention: figure 1 A reactive power compensation device is composed of two-way controllable valve group 1,

[0017]Two-way controllable valve group 2, two-way controllable valve group 3, two-way controllable valve group 4, two-way controllable valve group 5, two-way controllable valve group 6, two-way controllable valve group 7, two-way controllable valve group 8, two-way controllable valve group Controllable valve group 9, two-way controllable valve group 10, two-way controllable valve group 11, two-way controllable valve group 12, two-way controllable valve group 13, two-way controllable valve group 14, two-way controllable valve group 15, two-way controllable valve group Control valve group 16, two-way controllable valve group 17, two-way controllable valve group 18, two-way controllable valve group 22, two-way controllable valve group 23, two-way controllable valve group 24, two-way controllable valve group 25, C1 c...

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Abstract

The invention discloses a reactive compensation device. On the basis of a load characteristic of a distribution system, an inter-phase reactive compensation capacitance value is designed, so that the number of compensation capacitors needing frequent switching is reduced, the service life and security of most of compensation capacitors are improved substantially. A controllable semiconductor switch is used for carrying out commutation to improve the commutation efficiency, so that the rapid dynamic reactive compensation can be realized conveniently. Valve sets of an upper bridge arm and a lower bridge arm are for mutual standby application; when a fault occurs at one valve group, the standby valve group is started to form different conduction loops, so that the same inter-phase compensation cavity is compensated by using the same control way. Therefore, the fault can be eliminated rapidly and the system reliability is improved.

Description

technical field [0001] The invention relates to a reactive power compensation device, in particular to a reactive power compensation device used in the case of unbalanced three-phase power system bus. Background technique [0002] The existing reactive power compensation devices are designed only considering the three-phase load balance of the power distribution system. However, the steel industry or railway power distribution system usually includes multiple three-phase unbalanced loads, such as electric arc furnaces, rolling mills or traction motors. , the power distribution system used in the iron and steel industry or for railway transportation is usually a three-phase unbalanced system, and the reactive power compensation power required by the three-phase unbalanced system is also unbalanced. Therefore, when using the existing reactive power compensation device for When reactive power compensation is performed, it will inevitably cause serious overcompensation of some b...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/26
CPCY02E40/30Y02E40/50H02J3/1814H02J3/26
Inventor周岳
Owner石家庄赫伯孙电气有限公司