Study on coordinated control of load and Distributed Generation

Distributed Generation ( DG ) using renewable energy to generate power in distribution networks is influenced by natural conditions, and its output power is fluctuant, affecting whole system operation. According to load voltage characteristics and features of DG, this paper presents a method of coordinated control of load and distributed generation based on Volt-Var control, and analyzes the effectiveness of the method under different conditions. It could make load changes track the output power of DG and mitigate power fluctuations by voltage regulation, so it reduces or even eliminates the influence of power fluctuation on power grid. The simulation results of the IEEE 13 nodes test feeder system by GridLAB-D simulation platform show that changes of constant impedance and constant current loads could track DG output power by voltage regulation. Furthermore, load characteristics and voltage adjustment period have some influences on the tracking effect.