Optimization Method for Grid-connection of Distributed Generation Considering Demand Side Participation

The fluctuation of wind and photovoltaic (abbr. PV) power generation increases the difficulty of accommodating distributed renewable energy in power grid. To cope with this problem a demand response participation degree model was led in. Firstly, the configuration of distribution network containing distributed energy resource was researched by hierarchical optimization. Secondly, in the planning layer the renovation cost and network loss sensitivity were considered to determine the regulation and control capability of load capacity regulated and controlled by the grid as well as the installation positions of distributed energy sources. Thirdly, in the operation layer two modes, i.e., the mode of controlled participation of demand side load and the mode of active participation of price incentive, were considered to evaluate such indicators in the scenarios of different participation degree as economic benefit, usage rate of renewable energy source, voltage stability and peak load shifting, etc. Meanwhile, the simulated annealing - particle swarm optimization hybrid algorithm were used in the solving process to improve the solving efficiency of the hierarchical optimization model and to keep the diversity of the solution set. Finally, combining with a certain practical distribution system in North-Eastern China region the simulation analysis was performed. Simulation results show that demand side participates the grid-connection of distributed energy source can effectively improve the accommodation of energy source and the effect of peak-load shifting, thus, the reasonableness and effectiveness of the proposed method are verified.