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Low-voltage load shedding control method based on online monitoring indexes

A low-voltage load shedding and control method technology, applied in the direction of AC network voltage adjustment, information technology support systems, AC network circuits, etc. The amount and complexity of load shedding can improve comprehensive practicability, fast calculation and high accuracy.

Pending Publication Date: 2022-05-24
JIAOZUO POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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AI Technical Summary

Problems solved by technology

There are already a lot of research results based on this aspect: one is to optimize the distribution of points by sorting the contribution of each control node, and to carry out load shedding with the goal of minimizing the risk of undercut risk and overcut risk; the other is to ensure a certain voltage The recovery value is the goal, and the load shedding scheme is determined based on the PV curve. However, this method needs to use the continuous power flow method to obtain the PV curve of the load node, which is a bit complicated, and it is also impossible to determine the load shedding that improves the node voltage most significantly. The third is based on the impedance matrix of the node network, a low-voltage load shedding control method based on the analytical sensitivity index is proposed
Because these methods find the weak nodes of the system through some way, and then perform load shedding at the weak nodes, but they do not consider how much the weak nodes can shed the load

Method used

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  • Low-voltage load shedding control method based on online monitoring indexes
  • Low-voltage load shedding control method based on online monitoring indexes
  • Low-voltage load shedding control method based on online monitoring indexes

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Embodiment Construction

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention, and are specifically described below in conjunction with the embodiments.

[0053] like figure 1 Shown, the present invention comprises the following steps:

[0054] S1: According to the comprehensive dynamic equivalent analysis method, the necessary conditions for the power system to reach the limit transmission power are determined, and the impedance modulus index for measuring the voltage stability of the power system is proposed at the same time. The specific process is as follows:

[0055] figure 2 Shown is the equivalent circuit of a simple nonlinear system vie...

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Abstract

The invention relates to a low-voltage load shedding control method based on an on-line monitoring index, and the method comprises the following steps: S1, determining a necessary condition for a power system to reach a limit transmission power according to a comprehensive dynamic equivalent analysis method, and putting forward an impedance modulus index for measuring the voltage stability degree of the power system; s2, calculating the sensitivity of an impedance modulus index to the power of each node, and obtaining an optimal load shedding point set with a control sequence; and S3, load shedding is carried out according to the optimal load shedding point set, so that the total load shedding amount is minimum when the target impedance modulus is reached. The indexes comprehensively consider the nonlinearity and the time-varying property of the system, the method has the advantages of being rapid in calculation and high in accuracy, the optimal load shedding point set with the control sequence can be determined by calculating the sensitivity of the indexes to the power of each node, load shedding is carried out according to the optimal load shedding point set, and the load shedding efficiency is improved. The total load shedding amount can be minimized when the target impedance modulus is reached, so that the workload is reduced, and the comprehensive practicability is improved.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a low-voltage load shedding control method based on on-line monitoring indicators. Background technique [0002] In recent years, with the increase of social demand for electricity and the increasing pressure of environmental pollution, the scale of regional power grid interconnection has gradually expanded. Control brings further complications. A number of voltage collapse accidents at home and abroad have brought a major impact on the economy and people's lives of various countries. Therefore, it is extremely important to carry out research on voltage stability and find effective measures to prevent voltage instability. [0003] When the disturbance or failure of the system causes the voltage of the system to drop to an unacceptable level, the load shedding control method can be used to improve the voltage stability of the system. Minimum load shedding for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14
CPCH02J3/14H02J3/144H02J2203/10H02J2203/20Y04S20/222
Inventor 谢冬冬董洋洋李忠良牛垚郝少帅索海洋荣家鹏郭琳朱敏鹏栗超超原哲单鹏乐王亚飞申森林
Owner JIAOZUO POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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