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This paper discusses the applicability of a Full-Bridge MMC and a Half-bridge MMC to tap an LCC-HVDC. The suitability of the two types of converters has been evaluated by considering the performance of the LCC-HVDC system under AC and DC fault conditions. The energization sequences control and protection modifications to the LCC-HVDC system, equipment requirements associated with each converter technology...
This paper introduces a new method of controlling the arm currents in a VSC called direct current control. This method is a viable alternative to the commonly used decoupled control technique. The main advantages of this method are the simplicity and ease of tuning. It also makes it easy to apply a limit on the arm current orders. Although only the application of the method to a STATCOM controller...
This paper presents a comprehensive analysis of sub-synchronous interactions in a wind integrated power system to understand and mitigate them. The proposed procedure has two steps. In the first step, a frequency scan is performed to determine the presence of resonant frequencies in the sub-synchronous range. In the second step, a detailed small signal analysis is performed. Participation factors...
This paper demonstrates that wind farms connected to a grid through a series compensated transmission line may exhibit sub-synchronous oscillations. It is shown that the flux in the stator winding and the currents in the transmission line are the major participants of this mode. Dynamic Phasors are used to model the small signal model of the transmission network so that the network is accurately represented...
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