Three-phase unbalanced load switching method based on networking of phase-change switch

A technology for commutating switches and balancing loads, which is applied in the direction of reducing the asymmetry of the multi-phase network and eliminating/reducing the asymmetry of the multi-phase network. The effect of frequent movement and reduced wear and tear

Pending Publication Date: 2019-05-03
XIAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a three-phase unbalanced load switching method based on the commutation switch network, to solve the limitations of the existing method, the problem of poor practicability, thereby improving the Practicability and Reliability of Phase Switch Networking Decision

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  • Three-phase unbalanced load switching method based on networking of phase-change switch
  • Three-phase unbalanced load switching method based on networking of phase-change switch
  • Three-phase unbalanced load switching method based on networking of phase-change switch

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Embodiment

[0055] In order to verify the effectiveness of the method of the present invention, according to the data of the outlet end of the transformer at a certain moment in the data monitoring center of a distribution transformer station area, the method is used to perform unbalance adjustment calculations. There are 10 commutation switch devices (1 The main control box, 9 commutation boxes), the phase sequence and load current value connected to the 9 commutation boxes are shown in Table 1.

[0056] Table 19 Branch load current value and phase sequence

[0057]

[0058] By adopting the method of the present invention, it is determined that the heavy-load phase is phase C, the light-load phase is phase A, the load transfer direction is from phase C to phase A, the average value of the three-phase current is 40.6A, and the load to be transferred is 17.2A. The number of the box to be transferred is obtained by doing the difference item by item, and the load connection after commutat...

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Abstract

The invention provides a three-phase unbalanced load switching method based on the networking of a phase-change switch. A phase-change switch system in a low-voltage power distribution area comprisesa main control box for conducting the three-phase voltage and current measurement and calculating the unbalance degree. Multiple phase-change boxes carry out uninterrupted power switching on a load phase sequence. The input ends of the phase-change boxes are connected with A, B and C three-phase power grids. The output ends of the phase-change boxes are connected with single-phase loads. When a plurality of phase-change boxes operate in a networking manner, each phase-change box acquires a current value of a load connected with each phase-change box and transmits the current value to the maincontrol switch box through 433MHz wireless communication. After that, the main control switch box calculates the three-phase unbalance degree, decides which switch box needs to be switched to which phase, and selects an optimal switch combination. According to the method, the accuracy of three-phase imbalance degree calculation is improved. The method is used for reducing the loss of a switching device, ensuring the long-term operation of the phase-change box to be safe and stable, and improving the safety of the phase-change switch system and the power supply reliability.

Description

technical field [0001] The invention belongs to the technical field of three-phase unbalance in electric power systems, and in particular relates to a method for switching three-phase unbalanced loads in a commutation switch network. Background technique [0002] With the vigorous development of the national economy, all walks of life and people's lives in our country have an increasing demand for electric energy. Not only the quantity requirements are put forward, but also the requirements for electric energy quality standards are gradually increasing. Good power quality can not only ensure the safe and stable operation of the entire power grid and power equipment, but also has great significance for improving industrial production and product quality and the stability and order of people's daily life. The three-phase unbalance is one of the important indicators of power quality. The specific value of three-phase unbalance: in the power system, the amplitude of the three-p...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 焦尚彬付斌张青苑家玮
Owner XIAN UNIV OF TECH
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