Abstract
This paper presents an analysis of a new high voltage DC (HVDC) transmission system, which is based on current and voltage source converters (CSC and VSC) in the same circuit. This proposed topology is composed of one CSC (rectifier) and one or more VSCs (inverters) connected through an overhead transmission line in a multiterminal configuration. The main purpose of this Hybrid HVDC (H2VDC), as it was designed, is putting together the best benefits of both types of converters in the same circuit: no commutation failure and system’s black start capability in the VSC side, high power converter capability and low cost at the rectifier side, etc. A monopole of the H2VDC system with one CSC and two VSCs—here, the VSC is the Modular Multilevel Converter (MMC) considered with full-bridge submodules—in multiterminal configuration is studied. The study includes theoretical analyses, development of the CSC and VSCs control philosophies and simulations. The H2VDC system’s behavior is analyzed by computational simulations considering steady-state operation and short-circuit conditions at the AC and DC side. The obtained results and conclusions show a promising system for very high-power multiterminal HVDC transmission.
Highlights
In the Brazilian electrical system, hydroelectric power plants are being built far (2000 to 3000 km) away from its main load centers
In steady-state condition, DC voltage at FBMMC2 and at Current SourceConverter (CSC) is given by control and for the capacitor’s voltages control (CVC) used in FBMMC1 is shown in Figure 7 as in
Steady-state condition is expected that the transmitted power is unidirectional, which means In In steady-state condition is expected that the transmitted power is unidirectional, which means that the CSC operates as rectifier and the FBMMCs operate as inverters
Summary
In the Brazilian electrical system, hydroelectric power plants are being built far (2000 to 3000 km) away from its main load centers. Converter (CSC) based on thyristor or by Voltage Source Converter (VSC) based, for instance, on IGBT (Insulated Gate Bipolar Transistor). The majority of HVDC transmission systems have used the thyristor-based CSC technology and they are able to convert power up to 4 GW per pole [1]. The VSC-HVDC is relatively new and has fewer projects in service if compared to the CSC-HVDC. VSC has its rating limited to about a quarter the power of a CSC [2]. A hybrid DC transmission system based on CSC and VSC is proposed and analyzed in this paper.
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