A method for monitoring safety and stability of a power grid to which renewable energy is accessed

Abstract

The invention discloses a method for monitoring the safety and stability of a power grid to which renewable energy is accessed, and the method includes the following steps: 1) inputting standard dataof a case system; 2) using a Monte Carlo random sampling method to take N renewable energy samples to form a sequence v; 3) calculating the actual output active power of renewable energy per unit; 4)judging whether renewable energy output power which is not judged by the judging step normally runs; 5) calling power flow analysis software to carry out power flow calculation on the system and saving a calculation result; 6) carrying out transient stability calculation on the case system and storing a transient stability index eta and CCT data; 7) completing N times of simulation calculation; and 8) performing data processing. The invention has the advantages of: 1) more conveniently and more effectively defining of multiple faults; 2) actually only analyzing the fault group activated out ofinterest, and greatly improving the calculation efficiency; 3) being capable of flexibly, conveniently and quickly simulating and reproducing the actual fault process of the power grid.

Description

technical field [0001] The invention relates to the field of power grid safety monitoring, in particular to a method for monitoring the safety and stability of a power grid for renewable energy access. Background technique [0002] As a convenient and fast secondary energy, electric energy plays an extremely important role in social development and human life, and electric energy is mainly converted from primary energy such as coal and oil. With the continuous development of the economy, the demand for energy is also gradually increasing. Due to its non-renewable characteristics, the traditional fossil fuels dominated by coal are facing the plight of gradual depletion, and the continuous use of fossil fuels has caused serious pollution to the environment. The shortage of traditional non-renewable energy sources and serious environmental pollution have become serious obstacles to the development of electric power. Therefore, finding clean and efficient renewable energy to re...

AI Technical Summary

Problems solved by technology

[0019] 3) In an emergency state, the full load can be satisfied but a branch circuit or voltage has exceeded the limit

If there is warning in advance and safety correction measures can be taken accurately and timely, it may return to the alert state or normal state; otherwise, the system may collapse

[0020] 4) Disintegrated state, all three types of conditions are destroyed, and it can no longer meet all load requirements

[0021] 5) The state is restored, the accident is no longer expanding, and the network element overrun has been removed, but many users have not yet restored power supply

[0045] Obviously, the n-1 scanning method is not valued in practice due to its low efficiency

With the expansion of power grid scale and structural changes, dispatchers pay more attention to multiple fault analysis, but if the n-2 or n-3 scanning method is used, the calculation amount will expand in an avalanche manner, which is technically unrealistic

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