The paper deals with a formulation of an analytical control model for optimal power flow in an islanded microgrid (MG). In an MG with load change, wind power fluctuation, sun irradiation power disturbance, that can significant influence the power flow, and hence the power flow control problem in real life system faces some new challenges. In order to maintain the balance of power flow, a diesel engine generator (DEG) needs to be scheduled. | Journal of Computer Science and Cybernetics, , (2017), 180–192 DOI NOVEL CONTROL APPROACH FOR OPTIMAL POWER FLOW IN HYBRID WIND-PHOTOVOLTAIC-DIESEL GENERATION SYSTEMS DIEP THANH THANG1 , NGUYEN PHUNG QUANG1 , NGUYEN DUC HUY 2 1 Institute 2 School for Control Engineering and Automation; of Electrical Engineering, Ha Noi University of Science and Technology Abstract. The paper deals with a formulation of an analytical control model for optimal power flow in an islanded microgrid (MG). In an MG with load change, wind power fluctuation, sun irradiation power disturbance, that can significant influence the power flow, and hence the power flow control problem in real life system faces some new challenges. In order to maintain the balance of power flow, a diesel engine generator (DEG) needs to be scheduled. The objective of the control problem is to find the DEG output power by minimizing the total cost of energy. Using the Bellman principle, the optimality conditions obtained satisfy the Hamilton-Jacobi-Bellman equation, which depends on time and system states, and ultimately, leads to a feedback control or to the so called energy management to be implemented in a SCADA system. Keywords. Microgrid, photovoltaic, wind power, diesel power, optimal power flow, HamiltonJacobi-Bellman equation, distributed generation. 1. INTRODUCTION Due to climate change, renewable electricity such as wind and solar actually plays an important role in providing electrical energy to islands such as microgrid, distributed generations (DGs) have been installed using small-scale power generation technologies and rapidly increased in many countries at lower cost and higher efficiency. However, the uncontrollable nature of wind, solar power as well as load change raises uncertainty for power system operation on one hand, the integration of DGs and the information and communication technology (ICT) into the system is still complex on
