Flexible high-voltage direct-current (HVDC) load flow computational model and computational method thereof

Abstract

The invention provides a flexible high-voltage direct-current (HVDC) load flow computational model and a computational method thereof. The model is arranged in an alternative-current / direct-current composite electric network and comprises a control system, a converter transformer 1, a converter transformer 2, a filter 1, a filter 2, a commutation reactor 1, a commutation reactor 2, a virtualization service client (VSC) current converter 1, a VSC current converter 2, a direct-current capacitor and a direct-current power transmission circuit as well as an alternative-current electric network 1 and an alternative-current electric network 2, which are accessed by a direct-current system; and the method comprises steps of (1) increasing parameters of the converter transformer and a filter in the data of the alternative-current electric network; (2) inputting flexible HVDC systematic parameters and performing per-unit processing for the systematic parameters; (3) calculating VSC equivalent power generation active power controlled by constant direct-current voltage; (4) setting a type and a running parameter for a VSC equivalent power generator; and (5) starting the alternative-current / direct-current composite load flow computation. Due to the adoption of the model and the method, the flexible HVDC alternative-current / direct-current composite electric network load flow computation can be realized, the development and maintenance of a great amount of codes are not needed, the load flow status of the composite electric network can be high-efficiently solved, and an initial value can be provided for the dynamic property simulation of the composite electric network.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a flexible high voltage direct current (Flexible High Voltage Direct Current, Flexible HVDC) power flow calculation model and a calculation method thereof. Background technique [0002] Flexible HVDC is a high-voltage direct current transmission technology based on a voltage source converter (Voltage Source Converter, VSC). Since the Hellsyan Project was put into operation in 1997, this power transmission technology has attracted extensive attention from the power engineering and academic circles due to its significant technical advantages. As a DC transmission system with the ability to quickly control operating parameters, Flexible HVDC can improve the performance of the AC system in the following aspects: [0003] Fast active power control improves system transient stability; active or reactive power modulation control improves system dynamic stability; dynamic voltag...

AI Technical Summary

Problems solved by technology

Taking into account the power flow calculation of new components, the original program storage structure and solution process need to be greatly modified and adjusted, and the program development is difficult and the workload is relatively large

In addition, the calculation convergence characteristics of the original program will also be affected

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