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Voltage sag source judgment method and device

A technology of voltage sag source and determination method, applied in the direction of measuring device, measuring electricity, fault location, etc., can solve problems such as falling into economic disputes

Pending Publication Date: 2021-07-30
JIANGSU ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regarding the responsibility for the decline in power quality, both the power supply and the consumer often have disagreements or even fall into economic disputes due to the lack of judgment on the cause of the decline in power quality.

Method used

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  • Voltage sag source judgment method and device
  • Voltage sag source judgment method and device
  • Voltage sag source judgment method and device

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Embodiment 1

[0041] Embodiment 1: A voltage sag source determination method for determining the location of the voltage sag source in the power grid includes the following steps:

[0042] Step a: Monitor the operation status of the power grid at monitoring points (generally set monitoring points at the feeder lines of the substation and the convenience of the power supply network and users), obtain monitoring data, and judge whether voltage sag occurs in the power grid.

[0043] In this step a, the three-phase voltage u of the power grid at the monitoring point mi ami (t), u bmi (t), u cmi (t) and three-phase current i ami (t), i bmi (t), i cmi (t) The three-phase voltage sampling value u is obtained by synchronously sampling N points per fundamental wave cycle ami (k), u bmi (k), u cmi (k) and three-phase current sampling value i ami (k), i bmi (k), i cmi (k), then the three-phase voltage sampling value uami (k), u bmi (k), u cmi (k) and three-phase current sampling value i a...

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Abstract

The invention relates to a voltage sag source judgment method and device. The voltage sag source judgment method comprises the following steps of a, monitoring the operation state of a power grid at a monitoring point, obtaining monitoring data, and judging whether voltage sag occurs in the power grid, b, if the voltage sag occurs in the power grid, respectively calculating the average power of a fundamental wave period before the voltage sag occurs in the power grid and the average power of a fundamental wave period during the voltage sag occurs in the power grid according to the monitoring data, c, calculating the difference between the average power of one fundamental wave period during the voltage sag of the power grid and the average power of the fundamental wave period before the voltage sag of the power grid, and taking the difference as an active power difference, and d, according to the flow direction of the active power difference and a predefined reference direction, determining the orientation of the voltage sag source in the power grid relative to the monitoring point. The voltage sag source judgment device comprises a sampling unit and a data processing unit. The voltage sag source in the power grid can be automatically and accurately monitored.

Description

technical field [0001] The invention relates to a method and device for automatic monitoring and positioning of pollution sources that affect power quality of power grid power supply, in particular to a method and device for automatic monitoring of grid voltage sag source positioning. Background technique [0002] Voltage sag refers to a phenomenon in which the root mean square value of the supply voltage suddenly drops to 90% to 10% of the rated voltage amplitude in a short period of time, and the typical duration is 10ms to 1min. Some highly automated equipment is susceptible to voltage sags, and several cycles of voltage sags can cause huge economic losses to industrial production. According to foreign surveys, voltage sag has become the main cause of complaints in power quality problems, even accounting for 80% of the complaints. However, electric energy is a special product that is provided by the power sector to power users and whose quality is jointly guaranteed by b...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 杨波唐轶周阳徐俊李博周建良谢富伟
Owner JIANGSU ELECTRIC POWER CO
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