Chance Constrained Economic Dispatch Considering the Capability of Network Flexibility Against Renewable Uncertainties

TL;DR

This paper introduces a chance constrained economic dispatch model that incorporates network flexibility, allowing for better handling of renewable uncertainties and improving operational economy and security.

Contribution

It proposes a novel CCED model with continuous network flexibility variables and an efficient iterative solver applicable to various uncertainty types.

Findings

Network flexibility mitigates congestion caused by renewable uncertainties.

The method improves economic efficiency while maintaining security.

Case studies demonstrate significant operational benefits.

Abstract

This paper incorporates a continuous-type network flexibility into chance constrained economic dispatch (CCED). In the proposed model, both power generations and line susceptances are continuous variables to minimize the expected generation cost and guarantee a low probability of constraint violation in terms of generations and line flows under renewable uncertainties. From the analytical form of CCED, we figure out the mechanism of network flexibility against uncertainties -- while renewable uncertainties shrink the usable line capacities and aggravate transmission congestion, network flexibility mitigates congestion by re-routing the base-case line flows and reducing the line capacity shrinkage caused by uncertainties. Further, we propose an alternate iteration solver for this problem. By duality theory, we set up a master problem in the form of second-order cone programming to optimize generation dispatch scheme and a subproblem in the form of linear programming to optimize line susceptances. A satisfactory solution can be obtained efficiently by alternately solving these two problems. The proposed method applies to both Gaussian uncertainty and non-Gaussian uncertainty by means of Gaussian mixture model. The case studies on the IEEE 14-bus system and IEEE 118-bus system suggest that network flexibility can significantly improve operational economy while ensuring security under uncertainties.