Abstract
Many of the recent projects for new transmission line have considered the high-voltage direct current (HVDC) system, owing to the many advantages of the direct current (DC) system. The most noteworthy advantage is that a cable can serve as a substitute for the overhead transmission line in residential areas; therefore, the HVDC system application is increasing, and as the number of DC systems in the power system increases, the interaction assessment regarding the HVDC system gains importance. An index named multi-infeed interaction factor (MIIF) is commonly used to estimate the interaction between power converters; however, the HVDC system is composed of two converters and a transmission line. The MIIF represents the interaction between the rectifiers and inverters, but not for the whole system. In this work, a method to assess the interaction of the whole system was therefore studied. To decide on the location of the new HVDC transmission system at the planning stage, in consideration of the interaction of the existing DC system, the line flow change distribution factor, according to the HVDC-transmission capacity change, was examined. Also, a power system transient -stability analysis was performed with different HVDC system locations, depending on the distribution factor. The simulation results indicate that when the factor is higher, two HVDC systems have a stronger interaction and are less stable in the transient state.
Highlights
The high-voltage direct current (HVDC) system has been used since 1954 [1,2,3]
As the use of the DC system increases, the risk of abnormal interaction operations increases; the interaction between devices or systems that are based on power electronics needs to be assessed to operate the system normally
To evaluate the HVDC interaction, and the index is considered at the planning stage as multi-infeed effective short circuit ratio (MIESCR); 5
Summary
The high-voltage direct current (HVDC) system has been used since 1954 [1,2,3]. After the introduction of the first direct current (DC) transmission system, many of the current operators of the HVDC systems, as well as organizers of new transmission line projects, have considered DC transmission, as DC systems have more advantages [4]. Energies 2016, 9, 1068 of ultra-high voltage (UHV) alternating current (AC) transmission lines are still delayed or have been cancelled due to residents’ reluctance; high-capacity HVDC systems are being considered for the transmission of power from generation sites to load areas, while underground cables will be used in residential areas. A commutation failure can occur due to the different behavior and stability of voltage or power based on different features of the single-infeed HVDC system [7,8,9]; the interactions between multiple HVDC systems in an AC system need to be estimated to reduce the negative effects, and to operate the system normally. Assuming that the AC transmission line at the location of the new HVDC is installed, the line-flow change that occurs when the existing HVDC flow changes can be used as an index to evaluate the interaction sensitivity of the location. We performed a dynamic simulation using different distribution factors to estimate the transient stability
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