A Bi-Level Linearized Dispatching Model of Active Distribution Network With Multi-Stakeholder Participation Based on Analytical Target Cascading

Puliang Du,Ziwen Ma,Zhong Chen,Hongen Ding,Yanxi Chen

doi:10.1109/access.2019.2949097

Abstract

This paper addresses a linearized interactive dispatching model developed between active distribution network (ADN) and virtual micro-grid (VMG). To make such concept, a bi-level framework is adopted based on the analytical target cascading (ATC) method. In this model, the lower level dispatches each element in VMG from the standpoint of VMG's own interests, and an objective function of maximizing the VMG's benefits is constructed. The upper level dispatches each element in ADN from the perspective of ADN's economy and reliability, on this basis, a synthetic objective function is built. In addition, the ACT method is used to solve the coupling problem caused by the existence of interaction variables between the upper and lower levels, and ultimately to achieve win-win cooperation between ADN and VMG levels. Moreover, to reduce the computational complexity of the model and speed up the solving process, the second-order cone programming is employed in the proposed model to linearize the power flow calculation of the distribution network. Finally, simulation studies are conducted on the IEEE 18-bus distribution test systems to illustrate the feasibility of the proposed model. The stability and effectiveness of the model are verified by various comparisons.

Highlights

With the increasing penetration of distributed generation in distribution network, in order to realize the active management and scheduling of internal resources in distribution network, various countries have successively studied the active distribution network (ADN) technology under the VOLUME 7, 2019 framework of smart grid
This paper attempts to solve the dispatching problem caused by the emergence of a new environment with multistakeholder participation in power grid operation
A two-level optimization dispatching model between ADN and virtual micro-grid (VMG) based on the analytical target cascading (ATC) method is proposed

Summary

INTRODUCTION

With the increasing penetration of distributed generation in distribution network, in order to realize the active management and scheduling of internal resources in distribution network, various countries have successively studied the active distribution network (ADN) technology under the VOLUME 7, 2019 framework of smart grid. To figure out the problems mentioned above, a bi-level linearized dispatching model of active distribution network with the consideration of multi-stakeholder participation, the power supply reliability of ADN, and the solving speed of the model is developed in this paper, in which the VMG as the lower level of the model and ADN as the upper level. The lower level serves to optimize the operation scheduling of VGM, including renewable energy source (RES), energy storage system (ESS), distribution generation (DG), and response load (RL), to maximize the economic benefits of VGM. The exchange power between the ADN and the VGM, the energy storage on the side of the ADN, the output of the distributed generator, and the exchange power with the upper transmission network constitute the economic objective function, as shown in Eq (8), and the detailed expression of each item contained therein is as shown in Eqs. Eqs. (1)-(14) contains many constraints, which will be described and explained in detail in the following

OPTIMIZATION OBJECTIVE

SOLVING FLOW

CONCLUSION