Generic modeling of a line commutated HVDC system for power system stability studies

Abstract

This paper will reveal a novel comprehensive approach for generic modeling and control design of line commutated HVDC systems. The model will be developed based on the essential HVDC equations and transfer functions. Due to comparing the generic model with an EMT (Electro-Magnetic Transient) HVDC model the consistence of the dynamic behavior will be shown. Furthermore modeling of additional HVDC system facilities like transformer tap-changers and AC filters will be annotated. Control design schemes for line commutated HVDC systems will be derived and the interactions of the controllers applied to the developed model will be investigated.

Generic modeling of a self-commutated multilevel VSC HVDC system for power system stability studies

“…Simulation parameters were chosen according to Table I and can be obtained e.g. from [6], [12], [13] and [14]. Figure 14 shows a startup process of the HVDC system with a subsequent power reversal and a DC circuit configuration taking the dynamics of the distributed sub module capacitors into account according to Figure 9 or Figure 10 respectively.…”

“…The model was connected to two AC grids according to Figure 1 using so called Three Phase Dynamic Load blocks (VAR-P/Q). Additionally the transformer tap changers were modelled as described in [12] in order to control the voltage at the connection point. During the startup process the AC voltage drops due to the infeed of reactive power which was set to this specific set-point but is not necessarily like this.…”

Impact of HVDC dynamic modelling on power system small signal stability assessment

“…It is common to introduce a current error control (CEC) signal between the DC current control and DC voltage. This CEC can also be introduced between the DC current control and extinction angle control in order to make transitions between different control modes more smooth [27], [28]. The minimum of these signals is selected as the inverter control mode because it is desirable to operate the inverter at the minimum extinction angle to minimise reactive power consumption, power losses and harmonic level [20].…”

Modified Quasi-Steady State Model of DC System for Transient Stability Simulation under Asymmetric Faults

“…Dynamic phasor method was firstly presented in [20]; its application for modeling of DC system, through Fourier series expansion, has been mainly used for harmonic analysis of hybrid AC/DC system [21][22][23][24][25][26].…”