Abstract
This paper presents a microgrid stability controller (MSC) in order to provide existing distributed generation units (DGs) the additional functionality of working in islanding mode without changing their control strategies in grid-connected mode and to enhance the stability of the microgrid. Microgrid operating characteristics and mathematical models of the MSC indicate that the system is inherently nonlinear and time-variable. Therefore, this paper proposes an adaptive robust total sliding-mode control (ARTSMC) system for the MSC. It is proved that the ARTSMC system is insensitive to parametric uncertainties and external disturbances. The MSC provides fast dynamic response and robustness to the microgrid. When the system is operating in grid-connected mode, it is able to improve the controllability of the exchanged power between the microgrid and the utility grid, while smoothing the DGs’ output power. When the microgrid is operating in islanded mode, it provides voltage and frequency support, while guaranteeing seamless transition between the two operation modes. Simulation and experimental results show the effectiveness of the proposed approach.
Highlights
Features such as low investment, environmental friendliness, high reliability and flexibility make distributed generation (DG) systems an interesting and promising technological option [1,2,3]
At 0.5 s, the output power of DGPV increases to 50 kW and at 1 s the microgrid disconnects from the utility, operating
The converter used in the microgrid stability controller (MSC) is built based on IGBTs and the proposed control strategy is carried out by using a digital signal processor (DSP) TMS320F28335 produced by Texas Instruments Inc. (Dallas, TX, USA)
Summary
Features such as low investment, environmental friendliness, high reliability and flexibility make distributed generation (DG) systems an interesting and promising technological option [1,2,3]. This paper proposes a “microgrid stability controller” (MSC) based on energy storage equipment, which provides islanding operation functionality to conventional DG systems without changing their grid-connected control strategies. In grid-connected mode, the MSC can smooth the exchanged power at the PCC, avoiding voltage fluctuations and other power quality issues in the main grid This feature is important when prime movers are renewable energy sources which are characterized by having a stochastic and intermittent behavior. The MSC is expected to operate with high efficiency, low output current total harmonics distortion, and sinusoidal output voltage with a specified frequency and amplitude in all operation modes In addition to this requirement, the MSC must be robust against disturbances, having good voltage regulation and fast dynamic response. Reference [39] uses SMC in the voltage control loop of a voltage-sourced rectifier, which provides quasi unity power factor operation, low harmonic content and fast dynamic response.
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