Decentralised control for reactive power sharing using adaptive virtual impedance

DAVIC: A New Distributed Adaptive Virtual Impedance Control for Parallel-Connected Voltage Source Inverters in Modular UPS System

“…Thus, with (25) and (26), we can calculate the approximate control parameters for the proposed DAVIC. It should be noticed that optimized parameters will be obtained further based on the simulation and experiments.…”

“…For the purpose of improving the performance of conventional droop plus virtual impedance loop framework, the adaptive virtual impedance control has been proposed in several research works [22][23][24][25][26]. The output impedance is commonly adjusted to be inductive in accordance to the conventional droop function, in which the active power can be controlled by the inverter frequency while the reactive power can be regulated by the output-voltage amplitude.…”

Adjustable inertia implemented by bidirectional power converter in hybrid AC/DC microgrid

“…Xu et al [22] try to simulate characteristics of the paralleling capacitor at the VSG output terminal and to compensate for the output voltage so that the control can reduce the power-sharing error. For a similar purpose, Hu et al [23] employ an adaptive virtual impedance to improve the accuracy of powersharing. And in [24], the control strategy tries to improve the frequency response curve by changing the rotational inertia coefficient dynamically.…”

Reactive power sharing control for islanded AC microgrid based on fuzzy adaptive compensation method

“…However, a large number of synchronous sampling events depend heavily on synchronous communication, and then the long communication delay may affect the stability. Furthermore, the improved virtual impedance method is introduced in [15, 16], the principle is to eliminate the relative error of line impedance between DGs, which can also reduce the reactive power sharing error. However, the virtual impedance may lead to the decline of system voltage quality.…”