Abstract
In the case of VSC-based HVDC transmission systems, the transfer of power is controlled in the same way as in the case of a classic HVDC transmission. The inverter side controls the active power, while the rectifier side controls the DC voltage [33, 56]. With classic HVDC, the reactive power cannot be controlled independently of the active power. VSC-HVDC makes it possible to control the reactive power and the active power independently. The reactive power flow can be controlled separately in each converter by the AC voltage that is requested or set manually without changing the DC voltage. The active power flow can be controlled by DC voltage on the DC side or the variation of frequency of AC side or set manually. Thus, the active power flow, the reactive power flow, the AC voltage, the DC voltage, and the frequency can be controlled when using VSC-HVDC. Figure 3.1 represents the control structure of the VSC-HVDC transmission system.
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Ibrahim, N.F., Dessouky, S.S. (2021). VSC-HVDC Control System. In: Design and Implementation of Voltage Source Converters in HVDC Systems. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-030-51661-1_3
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