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The reactive power compensation of converter station plays an important role in the design of HVDC project. Reactive power configuration for HVDC converter station is introduced in this paper. The regulation and control of reactive power and devices are considered from both steady-state and dynamics aspects. The performance of various reactive power configuration methods are compared and summarized...
Ac system strength indicated by short circuit ratio (SCR) and its impact on commutation failure in HVDC transmission system are studied. SCR is varying along with ac system operation mode, grid configuration, load characteristics and reactive power compensation devices at inverter station. Quasi-steady state calculations show that SCR increases commutation reactance and consequently increases the...
Reactive power balance of converter station exerts a profound influence on the normal operation of AC and DC system. Being DC link project of Sichuan and Shaanxi "hydro power and thermal power aiding each other", Debao HVDC project optimizes the two provinces' allocation of resource and energy .According to the requirements of reactive power balance when HVDC transmission is in stable operation,...
Ice accumulated on conductor in transmission line can cause severe damage to the network. Various de-icing methods are introduced in details. According to the types of transmission lines, ice melting methods are classified into ac line de-icing and dc line de-icing. Different methods are described as many as possible. Then advantages and disadvantages of various de-icing methods are compared and the...
In the traditional controller design, local signal is only chosen to be the feedback variable, and improvement of single performance in the system is considered. This way to design controller could make uncertain affect to other performance in the system. A comprehensive performance index is used in the coordinated control theory, and the controller which is more coordinated is designed. By using...
Commutation failure (CF) is a serious malfunction in HVDC systems. Fast detection and identification is important to avoid HVDC system block or even further deterioration of the whole system. This paper proposes a novel approach of CF recognition using wavelet transform and Shannon entropy technique. Only phase A voltage signal at inverter is used as the input of the new method. AC voltage is decomposed...
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