Autonomous economic dispatch of multi-microgrid systems considering complementarity between wind and solar power

Abstract

With the continuous increase of renewable energy permeability， the randomness of new energy and the benefit game between different operators bring a great challenge to the economic dispatch of power system. For safety and economy improvement of microgrid system， the paper proposes an autonomous economic dispatch method for multi-microgird systems considering the complementarity between wind solar power. With the goal of optimal cost for operation economy of multi-microgrid and taking account of unit regulation cost under multiple scenarios， a typical scenario generation method of wind and photovoltaic power based on Copula theory is proposed. Analytical target cascading （ATC） is used to establish a two-layer optimization model to optimize microgrid and distribution networks autonomously and independently. The IEEE 33 bus system is taken as an example to compare the economic efficiencies of multi-microgrid systems that take account of wind-solar power correlation and multi-microgrid systems that take account of random scenarios only. Furthermore， the economic efficiencies are compared with that of the centralized dispatching method. It is verified that the dispatching method taking account of the complementarity between wind and solar power can improve system economy and enhance system robustness under extreme scenarios.

Keywords

• multi-microgrid systems
• wind-solar power complementarity
• scenario generation
• autonomous optimization