Passivity-based coordinated control for islanded AC microgrid

Abstract

A novel passivity-based coordinated control strategy is proposed for an islanded AC microgrid including renewable energy source and energy storage system units. The main advantage is that the proposed coordinated control strategy manages the microgrid without using a phase-locked loop system. In the microgrid, the energy storage system supports the voltage of the microgrid, and the renewable energy sources inject their maximum power to the microgrid in the normal operation. For the energy storage system, we use a proportional-resonant controller, and for the renewable energy sources, we use a voltage modulated direct power control method, which has not only a good tracking performance but also a good steady-state behavior. Another advantage of the proposed method is that the asymptotical stability of the whole microgrid can be guaranteed by using the passivity principle when the heterogeneous renewable energy sources are integrated into the microgrid. To validate the proposed coordinated control law, we use a microgrid consisting of one energy storage system, one wind turbine, one photovoltaic and two controllable loads. Simulation results show that the plug-andplay capability of the wind turbine and photovoltaic in the microgrid is enhanced when comparing with the conventional vector current control method with a phase-locked loop system. Moreover, the voltage and frequency of the microgrid are recovered to its nominal value by the energy storage system with the proposed method as well. Finally, experimental verification of the proposed coordinated control algorithm is performed

Passivity-Based Control Design Methodology for UPS Systems

“…For a star load (Figure 1), the Clarke transformation and reverse Clarke transformation are Equation (7).…”

“…The control design of single-phase and three-phase voltage source inverters (VSI) for uninterruptable power supply (UPS) systems has been extensively discussed for the last four decades [1][2][3][4][5][6]. The PBC control strategies are implemented in renewable energy sources and energy storage systems [7]. Typically, two control types for the UPS systems are implemented in order to meet the standard requirements that are defined by IEC 62040-3 [8] for nonlinear rectifier resistive-capacitive (RC) load types.…”

Study of the Sustainability of Electrical Power Systems: Analysis of the Causes that Generate Reactive Power

“…Previous studies of this problem propose different solutions to minimize the presence of reactive power in the Electric Distribution System [22][23][24][25][26][27][28][29][30], as well as to minimize the costs generated by its presence [31,32]. Traditionally, according to these studies, the presence of reactive power is exclusively associated with the presence of the elements mentioned above.…”

Distributed energy storage system‐based nonlinear control strategy for hybrid microgrid power management included wind/PV units in grid‐connected operation

“…[32][33][34][35] In Mane et al, 36 a Lure-Lyapunov-based nonlinear control strategy has been proposed for executing the management of the hybrid energy system consisting of a fuel cell and ultracapacitor. [32][33][34][35] In Mane et al, 36 a Lure-Lyapunov-based nonlinear control strategy has been proposed for executing the management of the hybrid energy system consisting of a fuel cell and ultracapacitor.…”

“…The nonlinear dynamic model of hybrid DC/AC microgrid increased attention to various nonlinear and novel control techniques. [32][33][34][35] In Mane et al, 36 a Lure-Lyapunov-based nonlinear control strategy has been proposed for executing the management of the hybrid energy system consisting of a fuel cell and ultracapacitor. In order to reduce the momentary ripples of the DC-bus voltage and enhance the power quality in an AC/DC microgrid, a nonlinear disturbance observer-based DC-link voltage control has been designed in Wang et al 37 This controller had the "plug-andplay" characteristic and did not require to be remotely measured.…”