Power grid restoring capacity calculation method considering black-start process

Abstract

The invention discloses a method for calculating the power grid restoring capacity after power blackout. The method comprises the steps that related parameter information of black-start units, units to be restored and power transmission lines in a system is obtained; a weighting network connection matrix corresponding to the system is built; the sum of weighting capacities and corresponding per unit values of all the usable black-start units in power generation plants of all the usable black-start units are calculated; a generalized black-start unit node serves as the root node, and a minimal spanning tree T1 containing all the plant-station nodes is searched and generated; the average shortest distance D1 from the generalized black-start unit node in the tree T1 to nodes of all the units to be restored is calculated; the average shortest distance D2 from the generalized unit node in the tree T1 to rest load nodes is calculated; the average value of the D1 and the D2 is calculated; the power grid restoring capacity is calculated. The method for calculating the power grid restoring capacity after the power blackout has the advantages that contributions of the black-start units which are different in preferred sequence are distinguished, so that calculation of the power grid restoring capacity is more objective.

Description

technical field [0001] The invention relates to a calculation method of a power grid index, in particular to a calculation method of a power grid resilience considering a black start process. Background technique [0002] With the rapid development of economy and society, the scale of power system is getting bigger and bigger, and the production and life of the whole society are more and more dependent on reliable power supply. In order to ensure the rapid development of the national economy and the normal order of social production and life, it is necessary to ensure the safe, stable and reliable operation of the power grid, and to improve the continuous and reliable power supply for economic development and national life. In order to improve the security and stability of the power grid, a large number of new technologies and new equipment have been applied to the power system, but the occurrence of blackouts cannot be fundamentally avoided. In recent years, there have bee...

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Problems solved by technology

For example, on August 14, 2003, the most serious power outage in North American history occurred. The power outage affected many areas in the United States and Canada, with a loss of load of 61.8GW and a population of 50 million. Improper handling of the short-circuit fault of the 345kV transmission line caused a large-scale transfer of the power flow, resulting in chain tripping of multiple transmission lines due to overload, and finally led to a major blackout. France, Italy and other countries lost a total of about 16 million kW of load, and 15 million users were affected. The reason for the power outage was that the power grid had a large-scale shift, which led to the successive release of equipment in weak links of the power grid; November 10, 2009 On Japan, a major blackout occurred in the power grids of Brazil and Paraguay, which resulted in the tripping of three 750kV lines and the blocking of two ±600kV DC lines. The Brazilian power grid lost about 17 million kW of power. The power outage spread to 12 states in Brazil and most parts of Paraguay , 50 to 60 million people were affected. The accident was a typical transient power angle instability accident caused by power grid failure; on July 30 and 31, 2012, two large-scale power outages occurred consecutively in northern and eastern India The accident, covering more than half of the country, directly affected the lives of more than 600 million people. Both accidents originated from the tripping of the 400kV tie line of the northern and western power grids, and the subsequent cascading failures eventually led to the collapse of the power grid

[0004] Second, large-scale power outages are caused by extreme disasters that cause massive losses of power grid equipment.

[0006] At present, the research on power grid resilience is still in its infancy, and it is necessary to further improve the evaluation theory and evaluation indicators of power grid resilience. This is an important theoretical basis for power grid resilience research, and it is also the cornerstone for further guiding power system disaster prevention and mitigation planning and operation.

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