Three-phase unbalance adjusting device and a current limiting method thereof

A technology of balanced regulation and three-phase current, applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc.

Active Publication Date: 2019-01-22
SHENZHEN POWER SUPPLY BUREAU
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Problems solved by technology

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a three-phase unbalance regulating device and its current limiting method, wh

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  • Three-phase unbalance adjusting device and a current limiting method thereof
  • Three-phase unbalance adjusting device and a current limiting method thereof
  • Three-phase unbalance adjusting device and a current limiting method thereof

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] Such as figure 2 As shown, in the embodiment of the present invention, a method for limiting the current of a three-phase unbalance regulating device is provided. (Such as figure 1 shown), the method comprises the following steps:

[0046] Step S1. Obtain the ABC three-phase current x on the load side a 、x b 、x c and its corresponding synchronous phase angle θ, and based on the rotating coordinates, the obtained load-side ABC three-phase current x a 、x b 、x c and its corresponding synchronous phase angle θ for dq transformation to calculate the positive sequence d-axis current component x + d , Positive sequence q-axis current component x + q , negative sequence d-axis current component x - d and the negative sequence q-axis current component ...

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Abstract

The invention provides a current limiting method for a three-phase unbalance adjusting device. the method comprises the following steps of obtaining three-phase current of load side ABC and phase angle of corresponding synchronization thereof, dq transforming the obtained three-phase current of load side ABC and phase angle of corresponding synchronization thereof based on rotational coordinate tocalculate positive sequence d-axis, q-axis current component and negative sequence d-axis, q-axis current component; 3-phase virtual current is obtain after that positive sequence d-axis and q-axis current component and the negative sequence d-axis and q-axis current components are transformed, and the dynamic and steady-state current limit judgement values are determined according to the three-phase virtual current; A dynamic current limiting judgement value is compared with a first threshold value and a steady-state current limiting judgement value with a second threshold value, and according to the comparison result, a current limiting mode currently entered is determined to be a dynamic current limiting mode or a steady-state current limiting mode. As that invention is implement, thedynamic and steady three-phase unbalanced current regulation can be taken into account at the same time, and the damage of other equipment and the waste of power and resource can be avoided.

Description

technical field [0001] The invention relates to the technical field of power distribution network, in particular to a three-phase unbalance regulating device and a current limiting method thereof. Background technique [0002] In the distribution network power supply system of low-voltage three-phase four-wire system, since the user-side access is mostly single-phase load mode or mixed use mode of single-phase load and three-phase load, and the load size and power consumption time are different, it is easy to cause The long-term imbalance of the three-phase load in the low-voltage power supply system not only increases the loss of the line and the transformer, but also reduces the output of the transformer and even affects the safe operation of the transformer, which will eventually cause the imbalance of the three-phase voltage. With the development of the power electronics industry, the three-phase unbalance regulating device based on power electronics technology can solve...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 蔡丛楠黄焕强姜林福马楠时亨通吴艺李喆黄照贺裴璐吴钊铭陈加豪尹龙强迟屹楠
Owner SHENZHEN POWER SUPPLY BUREAU
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