Abstract: In nowadays, the power quality problems, such as voltage fluctuations and harmonic, limit the high integration of microgrid in the distribution network. This paper innovatively proposes a method for microgrid integration considering the power quality constrains preliminarily at the planning stage. Firstly, we derive the probabilistic power fluctuation model of microgrid, and present the static-state evaluation of power quality of microgrid. Based on the consideration of network loss and other economic benefits, we transform the power quality index into the related constraint conditions, and present the chance-constrained model for microgrid integration. As the proposed model is a mixed integer one consisting of both linear and non-linear element, we adopt linear decreasing inertia weight-particle swarm optimization （LDIW-PSO） algorithm to solve it. In order to verify the proposed method, we simulate the microgrid integration in a real industrial park under IEEE 33-bus system, whose results show that the proposed method can effectively improve the permeability of microgrid in distribution network.

Key words: microgrid, power quality constraints, preliminary planning, chance-constrained model