A system and method for unbalanced voltage regulation based on flexible current source

A technology of balancing voltage and balance adjustment, applied in the direction of reducing the asymmetry of polyphase networks, eliminating/reducing asymmetry of polyphase networks, etc. Reduce the effect of high compensation, improve reliability and safety

A technology of balancing voltage and balance adjustment, applied in the direction of reducing the asymmetry of polyphase networks, eliminating/reducing asymmetry of polyphase networks, etc. Reduce the effect of high compensation, improve reliability and safety

CN111009910BActive Publication Date: 2022-07-22NR ELECTRIC CO LTD +2
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  • A system and method for unbalanced voltage regulation based on flexible current source
  • A system and method for unbalanced voltage regulation based on flexible current source
  • A system and method for unbalanced voltage regulation based on flexible current source

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0038] like figure 1 As shown, it is a specific embodiment of an unbalanced voltage regulation system based on a flexible current source of the present invention. The unbalanced voltage regulation system, used in a low-current grounding system, includes a three-phase unbalanced regulation device, a flexible current source . The input end of the three-phase unbalance adjustment device is connected to the busbar voltage transformer and the arc suppression coil, obtains the busbar three-phase voltage and zero-sequence voltage from the busbar voltage transformer, and obtains the arc suppression coil current and gear information from the arc suppression coil; The output end of the three...

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Abstract

The invention discloses an unbalanced voltage adjustment system and method based on a flexible current source, comprising a three-phase unbalanced adjustment device and a flexible current source; The current and gear information of the arc suppression coil, the three-phase unbalance adjustment device calculates the adjustment current by measuring the current and gear information before and after the adjustment of the arc suppression coil, and sends a control signal to the flexible current source through the output terminal; the flexible current source receives The control signal outputs a specific current vector. The invention controls the unbalanced neutral point voltage to ground to zero, which can reduce the problem of excessive grounding short-circuit current caused by excessive compensation of the arc suppression coil caused by the unbalanced three-phase voltage, and greatly improve the reliability of the power grid. sex and safety. In the adjustment process, the arc-suppression coil is used to adjust the gear to change the current of the arc-suppression coil, which has a very low impact on the operation of the power grid.

Description

technical field [0001] The invention relates to an unbalanced voltage regulation system and method based on a flexible current source, which is applied to a low-current grounding system and belongs to the field of relay protection of power systems. Background technique [0002] In the 3kV-66kV low-current grounding system, some lines do not have reasonable phase commutation in the early stage of construction, resulting in inconsistent three-phase-to-ground capacitance values, resulting in three-phase unbalanced voltage. The three-phase unbalanced voltage requires a high compensation degree for the arc suppression coil, but this will lead to an excessively large regulated current when a single-phase ground fault occurs, endangering the safety of the power grid. If the device is used for adjustment to eliminate the three-phase unbalanced voltage during normal operation, the neutral point arc suppression coil can adopt a smaller compensation degree, thereby improving the stabil...

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Application Information

Patent Timeline
22 Jul 2022
Publication
CN111009910B
IPC
H02J3/26
CPC
H02J3/26; Y02E40/50
Inventors
李赫; 姜淼