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Adjusting method and system for three-phase imbalance of load of transformer area

An adjustment method and technology in the platform area, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, electrical components, etc., can solve the problem of high construction cost, unbalanced three-phase load, insufficient reactive power and harmonics wave and other problems, to achieve the effect of improving economic benefits, ensuring stable operation, and ensuring reliable power supply

Pending Publication Date: 2020-07-28
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology

The disadvantage is that the three-phase load balance at the low-voltage outlet of the distribution transformer is only achieved through the output compensation current, and the construction cost is high. It must be fully economically demonstrated. Balance, reactive power deficiency and harmonic overrun issues

Method used

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  • Adjusting method and system for three-phase imbalance of load of transformer area
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  • Adjusting method and system for three-phase imbalance of load of transformer area

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0068] like figure 1 As shown, the method for adjusting the three-phase unbalanced load of the station area in this embodiment includes the following steps:

[0069] S1. Use the existing power consumption information system to identify the station area and phase of the power user, and upload the identification result to the system master station 10;

[0070] S2. Collect the voltages and currents of all the electric meters 40 in the station area of ​​the terminal by HPLC (high-speed carrier wave) according to the predetermined collection frequency (such as once every 15min), and calculate the current average value in a period of 24 hours a day;

[0071] S3. The system master station 10 calculates the three-phase unbalance rate of the low-voltage power grid in the power supply station area according to the collected voltage and current of the el...

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Abstract

The invention discloses an adjusting method, system and device for three-phase imbalance of the load of a transformer area, a medium and equipment. The method comprises the following steps: S1, carrying out transformer area recognition and phase recognition on power consumers, and uploading recognition results; S2, acquiring the voltages and currents of all the ammeters in a transformer area to which a terminal belongs according to a preset acquisition frequency, and calculating an average current value according to a preset period; S3, calculating the three-phase unbalance rate of a low-voltage power grid of the power supply transformer area according to the collected voltages and currents of the ammeters and the phase information of the transformer area where the ammeters are located; S4, if the three-phase unbalance rate exceeds a preset limit value, making a regulation and control strategy according to corresponding relation among the phase information, an intelligent phase changeswitch and electric meters carried under the intelligent phase change switch; and S5, issuing a regulation and control instruction, and issuing a phase switching instruction to the intelligent phase-change switch. The method has the advantages of dynamic adjustment, good real-time performance, low cost, high applicability and the like.

Description

technical field [0001] The invention relates to the technical field of power grid management, in particular to a method and system for adjusting three-phase unbalanced loads in a station area. Background technique [0002] At present, most distribution transformers in urban and rural distribution networks use three-phase transformers, and the three-phase load at the transformer outlet should be symmetrical in theory. Single-phase load, with the rapid development of the economy, the general improvement of people's lives, the increase of high-power household appliances (such as air conditioners, electric heaters, induction cookers, microwave ovens, electric water heaters, single-phase water pumps, etc.), the load gap between users is widening, Load migration causes changes in the load distribution of the entire station area. Irregularity and unpredictability of user load imbalance lead to long-term imbalance of three-phase load in low-voltage distribution network, unbalanced ...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J13/00
CPCH02J3/26Y02E40/50
Inventor 黄瑞周纲罗旻昱卿曦柳青杨茂涛陈浩
Owner STATE GRID HUNAN ELECTRIC POWER
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