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This paper presents the controller hardware-in-loop (CHIL) testing of Xiamen bipolar MMC-HVdc project based on Real Time Digital Simulator (RTDS). It revealed the system instability of MMC-HVdc converter and its controllers for the first time. The CHIL tests show that, the small signal stability of Xiamen bipolar MMC-HVdc project is related to the system controller and circulating current suppression...
This paper proposes a reduced order mathematical model for the VSC converter and its controls by linearizing the combined set of equations of the power system and controller. The reduced order model can preserve the unstable characteristic of the VSC system and provide an explicit mathematical expression for the system eigenvalues. This analytical formula can directly reveal by simple inspection relationships...
The impact of phase-locked loop (PLL) parameters on the dynamic and steady-state behavior of a voltage-source converter (VSC) in an HVDC transmission system is determined as a function of the system strength [parameterized by the short-circuit ratio (SCR)]. This is achieved by using a linearized small-signal model of the converter system and its controls. The model is validated via electromagnetic...
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