Power grid probabilistic load flow analysis method based on generalized semi-invariants and maximum entropy method

Abstract

The invention discloses a power grid probabilistic load flow analysis method based on generalized semi-invariants and a maximum entropy method. The power grid probabilistic load flow analysis method comprises the following steps: S1, establishing a power system load flow model considering frequency; S2, establishing a load random output model based on a normal distribution function; S3, establishing a new energy random output model by using a Gaussian mixture model; S4, calculating the probabilistic load flow of the power system based on a generalized semi-invariant method; and S5, fitting theprobability density curve of the output variable by adopting a maximum entropy method. According to the method, the problem of frequency and voltage fluctuation of the power system under the influence of input variable randomness can be effectively solved; the method has the advantages of accuracy, practicability and high efficiency; therefore, the out-of-limit risk of accessing large-scale new energy to the power system can be comprehensively evaluated, weak links of the power system are discovered, and further consumption of the new energy is promoted.

Description

technical field [0001] The invention belongs to the field of frequency-considered power system operation and safety analysis, in particular to a power grid probabilistic power flow analysis method based on generalized semi-invariant and maximum entropy method. Background technique [0002] In recent years, with the continuous development of my country's new energy grid-connected technology, the new energy grid-connected capacity has been increasing, and large-scale new energy grid-connected will become an important scene under the modern smart grid. However, due to the reduction of system inertia due to the access of new energy, and its strong randomness further intensifies the uncertainty and volatility of the power system, which in turn causes a series of safety and stability problems in the power system such as voltage and frequency violations. Based on this, it is of great significance to study the impact of uncertainty caused by the integration of large-scale new energy...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a power grid probabilistic power flow based on generalized semi-invariant and maximum entropy method in order to solve the problem that the current power system load and new energy randomness are intensified, resulting in an increase in the risk level of system voltage and frequency. The analysis method, which takes into account the impact of new energy power and load fluctuations on the system, can effectively calculate the probability density function of the system output random variables, and can further provide risk assessment, optimal scheduling, and grid connection for large-scale new energy access systems. Actively support the basis

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