Method and system for quickly positioning bus active imbalance based on multi-source data

Abstract

The invention relates to a method and system for quickly positioning bus active imbalance based on multi-source data. The method comprises the following steps: (1) if the unbalanced bus has a voltage grade of 500 kV, the SCADA real-time active data of each branch connected by the bus are compared with the real-time active data of WAMS, if the error between the two kinds of data is larger than 5 MW, the line is determined to be a defective line, and the line is subjected to defect elimination processing; and (2) if the unbalanced bus has a voltage grade of 220 kV, SCADA measurement of each branch connected by the bus is compared with state estimation and the real-time active data of an opposite line, if the error between the two kinds of data is larger than 3 MW, the line is determined to be a defective line, and the line is subjected to defect elimination processing. The problems that the existing bus power imbalance processing method can not meet quick defect positioning and processing for bus active imbalance, and the safety, quality and economic operation of the power grid is influenced can be solved.

Description

technical field

[0001] The application belongs to the technical field of power grid safe operation, and in particular relates to a method and system for quickly locating busbar active power imbalance based on multi-source data. Background technique

[0002] With the continuous development of the power industry, the role of the power grid dispatching automation system becomes more important. Whether the bus power is balanced is an important indicator for the assessment of power quality, which directly reflects the operating status of the power grid. If there is a power unbalanced fault on the bus, the cause of the fault must be analyzed in a timely manner, and the cause must be effectively treated to ensure the normal and safe operation of the power grid.

[0003] At present, some literatures have analyzed the unbalanced busbar power: Literature [1] (Analysis and Treatment of Causes of Busbar Active Power Unbalanced [J]. Jiangxi Electric Power, 2010, 34(4): 27-29) analyzed th...

Examples

Embodiment 1

[0051] This embodiment takes the high-voltage side bus (500kV) of a 500kV substation in Henan as an example to describe the method of the present invention in detail:

[0052] (1) Real-time data analysis

[0053] There are 5 branches (branch 1-branch 5) and 3 main transformers (main transformer 1-main transformer 3) connected to the bus. First, compare the real-time SCADA and WAMS data of the 8 branches and find that the main transformer at the same time 3 The SCADA active power measurement value on the high-voltage side is always less than the WAMS measurement value by about 10MW. Therefore, the line where the main transformer 3 is located is located as the problem line, and the comparison between the two at three times is listed in Table 1. Occasionally, other lines have the problem of slow refreshing of SCADA data, which needs to be further analyzed in combination with historical data.

[0054] Table 1

[0055]

[0056]

[0057] (2) Historical data analysis

[0058...

Embodiment 2

[0063] In this embodiment, taking a 500kV substation medium-voltage side busbar (220kV) in Henan as an example, the method of the present invention is described in detail as follows:

[0064] (1) Real-time data analysis: There are 8 branches (branch 1-branch 8) and 2 main transformers (main transformer 1-main transformer 2) connected to the bus. By comparing the SCADA measured data of each branch at the same time , state estimation data, and peer line data found that the SCADA measurement value of branch 4 is lower than other data by more than 20MW, so branch 4 is positioned as a defective line, and the comparison of relevant data of branch 4 at three times is listed, see Table 2. During the observation, it was found that the SCADA measured active power of some lines was refreshed slowly, exceeding 10 seconds. The site needs to further check the clock device and the change of the measurement and control device to send parameter settings.

[0065] Table 2

[0066]

[0067]...

technical field

[0001] The application belongs to the technical field of power grid safe operation, and in particular relates to a method and system for quickly locating busbar active power imbalance based on multi-source data. Background technique

[0002] With the continuous development of the power industry, the role of the power grid dispatching automation system becomes more important. Whether the bus power is balanced is an important indicator for the assessment of power quality, which directly reflects the operating status of the power grid. If there is a power unbalanced fault on the bus, the cause of the fault must be analyzed in a timely manner, and the cause must be effectively treated to ensure the normal and safe operation of the power grid.

[0003] At present, some literatures have analyzed the unbalanced busbar power: Literature [1] (Analysis and Treatment of Causes of Busbar Active Power Unbalanced [J]. Jiangxi Electric Power, 2010, 34(4): 27-29) analyzed th...

Examples

Embodiment 1

[0051] This embodiment takes the high-voltage side bus (500kV) of a 500kV substation in Henan as an example to describe the method of the present invention in detail:

[0052] (1) Real-time data analysis

[0053] There are 5 branches (branch 1-branch 5) and 3 main transformers (main transformer 1-main transformer 3) connected to the bus. First, compare the real-time SCADA and WAMS data of the 8 branches and find that the main transformer at the same time 3 The SCADA active power measurement value on the high-voltage side is always less than the WAMS measurement value by about 10MW. Therefore, the line where the main transformer 3 is located is located as the problem line, and the comparison between the two at three times is listed in Table 1. Occasionally, other lines have the problem of slow refreshing of SCADA data, which needs to be further analyzed in combination with historical data.

[0054] Table 1

[0055]

[0056]

[0057] (2) Historical data analysis

[0058...

Embodiment 2

[0063] In this embodiment, taking a 500kV substation medium-voltage side busbar (220kV) in Henan as an example, the method of the present invention is described in detail as follows:

[0064] (1) Real-time data analysis: There are 8 branches (branch 1-branch 8) and 2 main transformers (main transformer 1-main transformer 2) connected to the bus. By comparing the SCADA measured data of each branch at the same time , state estimation data, and peer line data found that the SCADA measurement value of branch 4 is lower than other data by more than 20MW, so branch 4 is positioned as a defective line, and the comparison of relevant data of branch 4 at three times is listed, see Table 2. During the observation, it was found that the SCADA measured active power of some lines was refreshed slowly, exceeding 10 seconds. The site needs to further check the clock device and the change of the measurement and control device to send parameter settings.

[0065] Table 2

[0066]

[0067]...

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