Abstract
This paper presents an adaptive nonlinear droop control (ANLDC) strategy for the voltage source converter (VSC) in multi-terminal high voltage direct current (MTDC) system, which enables the converters to provide primary frequency control for connected AC grids. The presented strategy inherits the concept of an emergency control approach. In normal condition when there is no significant deviation in RoCoF and DC voltage, it will be in inactive mode. The combination of two control techniques, nonlinear frequency-droop control, and nonlinear voltage-droop control results in a dual nonlinear controller that includes the advantages of both of them at the same time. The ANLDC strategy bears the advantage of the traditional droop control that is based on local measurements and there is no need for a communication system. The simulation results indicate that the AC/DC station with the proposed dual control strategy can improve simultaneously the primary frequency response and transient stability of the connected AC grid.
Highlights
T HE growing penetration of renewable energy sources especially offshore wind plants into the power system leads to challenges concerning grid stability, power quality, and inertia
voltage source converter (VSC)-HVDC system accelerated development resulted in building offshore wind farms (WFs) in far locations from onshore which are the potential sources of energy with cheap land [2]
D: Damping due to frequency sensitivity of loads. As it appeared from equation (1), the frequency response of the system depends on different parameters such as inertia constant H, primary mechanical injected power, VSC
Summary
T HE growing penetration of renewable energy sources especially offshore wind plants into the power system leads to challenges concerning grid stability, power quality, and inertia. This paper presents an adaptive nonlinear droop control method that enables the VSC converters of the MTDC grid to provide primary frequency support for the AC side especially for preventing temporary frequency deviation considering DC voltage stability and improving transient stability of the AC grid. It is demonstrated how a simple nonlinear gain-based droop controller can be used for PFC over an MTDC grid.
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