Method for improving reliability of extra-high voltage direct current access power system with wind power uncertainty

Abstract

The invention discloses a method for improving the reliability of an extra-high voltage direct current access power system with wind power uncertainty. The method comprises the following steps: simulating cumulative probability distribution of wind speed by using a Weibull distribution model; processing the cumulative probability distribution of the wind speed to obtain simulated wind speed, and obtaining wind power generation output; obtaining an alternating current-direct current coupling equation containing a current converter; determining a node power balance model of a node where the converter is located; establishing an optimal scheduling model by using an AC/DC coupling equation containing the converter and a node power balance model of the node where the converter is located; enabling the optimal scheduling model to carry out model solving according to wind power generation output, the number of available converters and the available condition of a generator set to obtain the load reduction amount, calculating the power supply insufficiency according to the load reduction amount, and improving the reliability of the power system according to the power supply insufficiency. According to the method, reliability analysis is effectively carried out on the extra-high voltage direct current and wind power integrated power system, and effective measures are taken to ensure reliable operation of the power system.

Description

technical field [0001] The invention relates to a method for improving the reliability of a power system, in particular to a method for improving the reliability of an UHV DC connected power system based on the number of converters and considering the uncertainty of wind power. Background technique [0002] At present, with the increasingly prominent problems of energy, environment, and climate change, the development of renewable energy has become a new trend in the world's energy development; in addition, the eastern economic region of my country is poor in resources, but the demand for electric energy is increasing day by day, and UHV inter-regional power transmission has become a solution The top priority of the power region's unbalanced contradictions. However, the large-scale application of wind power and the high proportion of UHV access will affect the reliability of the power system. For example, wind power has output uncertainty, and UHV DC failures will lead to a s...

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Problems solved by technology

However, the large-scale application of wind power and the high proportion of UHV access will affect the reliability of the power system. For example, wind power has output uncertainty, and UHV DC failures will lead to a shortage of power supply. Safe Operations Bring Challenges

[0003] At present, the reliability analysis of the UHV DC connected power system is complicated, the dimension of the solution is large, and the problem is difficult to solve, and there are currently a large number of wind power connected to the receiving end power system, which further increases the importance of the reliability analysis of the receiving end power system

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