Modeling, analysis and virtual parallel resistor damping control of VSC based

What is it about?

This paper presents a generic linearized modeling method and a virtual parallel resistor damping control for voltage source converter (VSC) based high voltage direct current (HVDC) system including DC grid. The generic modeling method is composed of DC network’s equivalent node-admittance matrix and the Thévenin equivalent matrix of all converters. A simplified two-terminal HVDC system is used to identify the key factors influencing the stability of the DC grid easily. Those key factors are proved by two methods, namely, root locus and participation factors analysis. The parameters of the virtual parallel resistor damping control are designed using the simplified HVDC system. The performance of the proposed damping control is studied employing the linearized model of DC grid. Time simulations such as instability suppressing, power-controlled station N-1 fault and DC system faults are carried out to validate the effectiveness of the damping control.

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Why is it important?

This paper presents a generic modeling method for DC grid. The key factors influencing the stability have been studied, and a virtual parallel resistor damping control is proposed.

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