Stability Analysis of the Micro-Grid Operation in Micro-Grid Mode Based on Particle Swarm Optimization (PSO) Including Model Information

Aims: Create a control policy for improve the quality of optimal voltage - frequency (V-F) power supply and stability analysis in a micro-grid scenario include DG units.

Study Design: Control policy for respond to sudden changes such as starting micro-grid mode, and or in load change conditions was designed.

Place and Duration of Study: IAU, Iran, February 2015-January 2016.

Methodology: This paper with using of particle swarm optimization (PSO), model information analysis, and voltage and frequency stability of a micro-grid is controlled. Proposed controller of model include an inner current control loop and an outer power control loop based on synchronous reference frame and conventional PI regulators.

Results: Simulation results show satisfactory performance voltage and frequency of system. Also, results show that proposed control policies established by acceptable limits voltage and frequency of system, and support from output power per some of DG unit in duration of load changes. In addition, simulation results improved system stability under proposed power controller and reduce errors in the proposed controller. The proposed PSO algorithm has good performance for finding the desired optimal control parameters to achieve the control objectives. Thus, automated enforcement mechanism based on the model information has been developed to determine these limits.

Conclusion: The paper is presented a power (V-F) control policy for micro-grid based on PSO algorithm. This is done by proposed voltage and frequency controller based on PSO algorithm for real-time self-tuning. Besides, fast dynamic response and an acceptable level of harmonic distortion as two main basic system performance parameters were obtained. The main objectives are supplied power quality improvement and power stability, otherwise in faced to sudden changes such as transition from connection to grid mode to island mode or load change is located.