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Three-phase voltage unbalance source location method, device and system

A technology of unbalanced voltage and three-phase voltage, which is applied in the field of power grid, can solve problems such as power quality degradation, affect the safety of power system equipment, and consume manpower and material resources, so as to eliminate unbalanced three-phase voltage, improve test efficiency, and ensure stable operation Effect

Active Publication Date: 2020-08-25
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for non-faulty three-phase voltage imbalances, the staff can only conduct a large number of tests and verifications at different locations to find the cause based on experience, but they cannot judge the location of the unbalanced source in time, and it takes a lot of manpower and material resources, as well as waste time, make the system run in an unbalanced state for a long time, resulting in a decline in power quality, affecting the safety of power system equipment, and endangering the stability, safety and reliability of the power system

Method used

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  • Three-phase voltage unbalance source location method, device and system
  • Three-phase voltage unbalance source location method, device and system
  • Three-phase voltage unbalance source location method, device and system

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Embodiment 1

[0036] figure 1 It is a flow chart of the method for locating the source of the three-phase voltage unbalance in Embodiment 1 of the present invention. This method can be used to locate the source of the three-phase voltage unbalance at the common connection point of the power system, and it is convenient and fast to identify the three-phase voltage The location of the unbalanced source, thereby reducing the difficulty of three-phase voltage unbalance testing, helps to quickly eliminate three-phase voltage unbalance, and ensure the stability of the power system. The method for locating the source of the three-phase voltage imbalance in the embodiment of the present invention mainly detects the non-faulty three-phase voltage imbalance.

[0037]In this embodiment, the power quality monitoring equipment at the public connection point is used as an example to illustrate the method for locating the three-phase voltage unbalance source. However, those skilled in the art should under...

Embodiment 2

[0053] figure 2 It is a flow chart of a method for locating a source of a three-phase voltage unbalance according to Embodiment 2 of the present invention. The method for locating a source of a three-phase voltage unbalance is suitable for detecting a non-faulty three-phase voltage unbalance. like figure 2 As shown, the three-phase voltage unbalance source location method includes:

[0054] S210. Obtain the voltage value and current value of the common connection point, calculate the negative sequence voltage value and negative sequence current value of the common connection point, and calculate the voltage unbalance degree caused by the negative sequence voltage and the voltage unbalance degree caused by the negative sequence current.

[0055] In this embodiment, the booster station where the wind power station is connected to the power grid is selected as the public connection point, the voltage value and current value are detected at the power station side, and the detec...

Embodiment 3

[0083] Figure 4 It is a structural block diagram of a three-phase voltage unbalance source locating device according to Embodiment 3 of the present invention, and the device is used to execute the method steps of Embodiment 1 above. like Figure 4 As shown, the three-phase voltage imbalance source location device includes a power quality monitoring module 410 and an imbalance source location module 420 .

[0084] Wherein: the power quality monitoring module 410 is used to obtain the voltage unbalance caused by the negative sequence voltage of the common connection point; Degree of balance; unbalance source locating module 420 is used to locate the source of the three-phase voltage unbalance according to the degree of voltage unbalance caused by the negative sequence voltage and the degree of voltage unbalance caused by the negative sequence current.

[0085] The three-phase voltage unbalance source locating device in the embodiment of the present invention judges whether th...

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Abstract

The embodiment of the invention provides a three-phase voltage unbalanced source positioning method, device and system. The method comprises the steps: obtaining a voltage unbalance degree caused by anegative sequence voltage of a common connection point; obtaining a voltage unbalance degree caused by a negative sequence current of the common connection point if the voltage unbalance degree exceeds a voltage unbalance degree threshold value; and carrying out the positioning of a three-phase voltage unbalanced source according to the voltage unbalance degree caused by the negative sequence voltage and the voltage unbalance degree caused by the negative sequence current. According to the technical scheme of the embodiment of the invention, the method can achieve the accurate judgment of whether the three-phase voltage unbalance happens to the common connection point or not, can achieve the quick positioning of the unbalance source, reduces the testing difficulty of the three-phase voltage unbalance, facilitates the quick removing of the three-phase voltage unbalance, and guarantees the stable operation of a power system.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method, device and system for locating a three-phase voltage imbalance source. Background technique [0002] Three-phase unbalance means that the amplitudes of the three-phase voltages (or three-phase currents) in the power system are inconsistent, and the amplitudes exceed the specified range. The unbalanced three-phase voltage of the power system will increase the power loss of transmission lines and distribution transformers, affect the safe operation of electrical equipment, and bring hidden dangers to the safe and stable operation of the system. [0003] The reasons that the power system may lead to the three-phase unbalance of the power system can be summarized as: fault unbalance and non-fault unbalance. Among them, the fault unbalance refers to the voltage unbalance caused by the failure of the power system components, for example, the three-phase voltage unbalance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 唐彬伟于连富
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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