A fault-tolerant method for locating the source of voltage sags
A technology of voltage sag source and location method, which is applied in the direction of measuring electricity, fault location, and measuring electrical variables, etc., which can solve the problems of not considering the influence of DG access, determining the degree of reliability, and not being able to integrate multiple independent criteria
Active Publication Date: 2018-08-21
STATE GRID ZHEJIANG HANGZHOU XIAOSHAN POWER SUPPLY CO +1
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Problems solved by technology
[0004] The present invention overcomes the problems that the existing voltage sag source location method cannot effectively characterize the reliability degree of sag source direction determination, cannot integrate multiple independent criteria, and does not consider the influence of DG access, and introduces a "reliability" index to represent various Factors affect the reliability of the determination results of the sag source direction, provide a voltage sag source location decision method that can integrate multiple independent criteria, and realize fault-tolerant voltage sag in the smart distribution network with DG Automatic and accurate positioning of the source
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[0063] The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto. An overall block diagram of a fault-tolerant voltage sag source location method in the embodiment is shown in the attached figure 1 shown, including the following steps:
[0064] 1. Construct an NPQMS with complete information; considering the economic cost of system construction, in a radial power distribution network containing L lines, after optimizing the location layout, choose to arrange the actual PQM at the head end of N lines; the rest are not arranged The line segment of the actual PQM is based on the principle of state estimation to complete the power quality information, and consider it to arrange "virtual PQM"; the total number of all actual PQMs and virtual PQMs included in the system is
[0065] 2. Determine their respective complete direction matrices based ...
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The invention discloses a fault-tolerant voltage sag source positioning method, and the method comprises the steps: building an NPQMS (networking power quality monitoring system) with complete information; determining the respective complete direction matrixes based on two independent criteria: a DP (disturbance power) algorithm and a DC (disturbance energy) algorithm; carrying out the analysis of reliability influence factors of a determination result in a sag source direction and reliability assessment; carrying out the fusion of the reliability factors of all influence factors and the direction information; carrying out the reliability weakening processing of a direction determining conflict point; carrying out the determining based on a prior positioning result based on a system extension coverage matrix and a fusion direction matrix; and carrying out the analysis and correction of the access influence of a DG (distributed generation).
Description
technical field [0001] The invention relates to a method for locating a voltage sag source with fault tolerance, belonging to the fields of electrical engineering and power quality. Background technique [0002] In recent years, power quality issues have become more and more important to the economy, security and energy stability of power systems. In the modern intelligent distribution network, the application of networked power quality monitoring system (Networked Power Quality Monitoring System, NPQMS) is more and more popular, which provides the possibility for the realization of intelligent diagnosis function of power quality. The automatic and accurate positioning of Power Quality Disturbance Source (PQDS) is helpful for identifying responsibilities, quickly solving problems and reducing losses as much as possible, and has become an important task of the intelligent diagnosis function of power quality. Therefore, as one of the most significant types of power quality di...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 翁国庆黄飞腾王强朱双双林雨丰方敏佳
Owner STATE GRID ZHEJIANG HANGZHOU XIAOSHAN POWER SUPPLY CO