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

A technology of power flow calculation and calculation model, which is applied to AC network circuits, power transmission AC networks, electrical components, etc., and can solve problems such as difficulty in program development, heavy workload, and influence of convergence characteristics

Active Publication Date: 2012-10-24
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment

[0122] (1) Apply the power system commercial analysis and calculation software BPA to establish Figure 5 The shown four-machine two-area Flexible HVDC AC-DC hybrid transmission system. Among them, the flexible DC two-terminal converter transformer and high-pass filter are both included in the AC grid modeling;

[0123] (2) The reference capacity of the AC and DC system is selected as 100MVA and 100MW, the reference voltage of the AC grid is 230kV, and the DC reference voltage is 115kV, which is the rated voltage of the secondary side of the converter transformer, and the parameters are converted;

[0124] (3)VSC 1 Constant active and reactive power control, VSC 2 Using constant DC voltage and constant reactive power control, the reference setting values ​​of each control quantity are P m1ref = 1.0 pu, Q m1ref = 0.0 pu, u d2ref = 2.0 pu, Q m2ref = 0.0pu. Based on this, the type of the secondary side busbar of the Flexible HVDC two-terminal converter transformer is set a...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/36
CPCY02E60/60
Inventor 郑超马世英宋云亭胡扬宇孟远景尚慧玉付红军
Owner CHINA ELECTRIC POWER RES INST
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