Sliding mode control of a DC distributed solar microgrid

Abstract

Abstract-This paper proposes a standalone distributed photovoltaic system which includes two independently controlled solar power sources, a battery storage and a resistive load. Each of the PV panels consist of cascaded DC-DC boost converters controlled through two independent sliding mode controllers. The design and simulation of the supervisory controller are also discussed. First, maximum power point tracking (MPPT) control strategy is introduced to maximize the simultaneous energy harvesting from both renewable sources. Then, according to the power generation available at each renewable source and the state of charge in the battery, four contingencies will be considered in the supervisory controller. Moreover, power converters interfacing the source and common DC bus will be controlled as voltage sources under a PI-sliding mode controller. Numerical simulations demonstrate accurate operation of the supervisory controller and functionality of the MPPT algorithm in each operating condition.

Sliding mode extremum seeking control for maximum power point tracking in wind system

“…Although conventional ESC MPPT has already been used well in many solar and wind applications [21], the switching function sign (s) usually operates at infinite frequency to reach the ideal condition. Such high switching frequency cannot be accomplished in actual systems and also make the output unstable with creation of high frequency noise (chatter) [22].…”

Power management strategy research for DC microgrid with hybrid storage system

“…When utility grid works normally, the DC bus will be connected to utility grid through the bi-directional converter and the power will be transmitted mutually; otherwise it will be disconnected with utility grid to avoid faults. which is manifested by DC bus voltage [15][16][17]. The operations of the proposed DC microgrid include five main modes shown as fig.6: modeⅠ(regulation by PV), mode Ⅱ(regulation by super-capacitor), mode Ⅲ (regulation by utility grid), Mode Ⅳ (regulation by battery in islanding mode).…”