Reliability evaluation method for hybrid alternating current and direct current power distribution network containing flexible transformer substation

Abstract

The embodiment of the invention provides a reliability evaluation method for a hybrid alternating current and direct current power distribution network containing a flexible transformer substation. The method comprises the steps of obtaining a network topology of a power distribution network and a component reliability parameter value, and determining reliability parameters of distributed generation DG; according to the network topology of the power distribution network, constructing a power electronics transformer reliability model; by judging whether the DG can independently meet the load requirement or not, building a multi-power failure tree or a single-power failure tree corresponding to a load; according to the minimum cutset theory, utilizing the multi-power failure tree or the single-power failure tree, and calculating reliability indexes of loads in the power distribution network; according to the reliability indexes of the loads in the power distribution network, working outreliability indexes of the power distribution network. The purpose of power distribution reliability evaluation on the condition that non-commercialized operation power electronic transformer equipment is applied to the flexible transformer substation is achieved, and the technical support is provided for researchable and planning design of a flexible transformer substation project.

Description

technical field [0001] The invention relates to the technical field of distribution networks, in particular to a method for evaluating the reliability of a hybrid AC / DC distribution network including flexible substations. Background technique [0002] With the maturity of energy development and utilization technology, the proportion of clean energy such as wind power and photovoltaics on the power source side gradually increases in the power source structure. At the same time, the types of loads on the power consumption side and the way of power consumption have also changed. For example, the number of DC loads such as computers and data centers is increasing, and there are bidirectional loads of charging and discharging formed by the electric vehicle industry driven by green transportation. In order to cope with fluctuations in power generation output caused by unstable natural resources such as wind and solar, and to reduce the harmonics generated by DC loads on the AC gri...

AI Technical Summary

Problems solved by technology

The resulting problems are: the increase of AC-DC converter conversion equipment in the power grid, including DC / AC or AC / DC conversion devices of different voltage levels, and the new additions such as DG (distributed generation, distributed power generation) in the power grid ), energy storage and other new equipment, these equipment also have their own output characteristics, resulting in a more complex power distribution network structure and more difficult coordinated control

In the past, the reliability analysis of flexible power equipment such as DC transmission and conversion equipment was based on the analysis and calculation based on the component-level reliability theory model, which was too ideal; in addition, the voltage level of flexible power equipment was high, at least 10kV and above, and the topological Complex, there are hundreds of IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), and the equipment reliability calculated based on a large number of component-level reliability theoretical models is prone to large errors. There is actually a large distance in the project

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