Structure-preserved power-frequency slow dynamics simulation of interconnected ac/dc power systems with AGC consideration

Analysis of derivative control based virtual inertia in multi‐area high‐voltage direct current interconnected power systems

“…As mentioned in [12][13][14], the authors focusing on this type of higher level control design, the proper time response could be between 100 and 500 ms. In this study, the time constant is assumed 300 ms for T DC .…”

“…This concept could be used for different application like AGC analysis considering a system for providing this virtual inertia to the system [7,8]. In order to emulate such inertia, an energy source is required.…”

“…This cost function is the regular function which is based on the ISE (integral of squared error) method [12,13]. The control parameter for this case study could be obtained using (40) and classical FMINCON function in Matlab software.…”

WAMS based robust HVDC control considering model imprecision for AC/DC power systems using sliding mode control

“…When considering the supplementary control design of HVDC links to enhance the stability of AC/DC power systems, some previous researches [10,12,14] represent the active power modulation of HVDC links as a reduced first-order inertial model, of which the equivalent time constant is assumed to be exactly known. However, the parameter uncertainties and high order dynamics without modeling of the actual HVDC systems may make this equivalent time constant time-varying or state-dependent, namely, the equivalent time constant is not exactly known, but only of known sign and bounds.…”

“…Although local signals are easy to get, they may not contain the inter-area oscillation modes, while the COI signals are able to provide the full inter-area oscillation modal information. With the wide application of the wide-area measurement system (WAMS) [15,16], communication of COI signals is no longer a problem [4,14]. (c) The control design in this paper can also be applied to power systems with multiple HVDC links.…”