Distributed Load Shedding for Microgrid with Compensation Support via Wireless Network

TL;DR

This paper presents a distributed load shedding method for microgrids using wireless networks, optimizing power coordination and employing a multicast TDMA protocol to improve response speed and reliability.

Contribution

It introduces a novel distributed load shedding algorithm based on subgradient method and a multicast TDMA protocol for microgrid management.

Findings

Reduces load-shedding amount through power compensation.

Enhances response rate and reliability with MMST protocol.

Demonstrates feasibility via NS3-Matlab simulations.

Abstract

Due to the limited generation and finite inertia, microgrid suffers from the large frequency and voltage deviation which can lead to system collapse. Thus, reliable load shedding to keep frequency stable is required. Wireless network, benefiting from the high flexibility and low deployment cost, is considered as a promising technology for fine-grained management. In this paper, for balancing the supply-demand and reducing the load-shedding amount, a distributed load shedding solution via wireless network is proposed. Firstly, active power coordination of different priority loads is formulated as an optimisation problem. To solve it, a distributed load shedding algorithm based on subgradient method (DLSS) is developed for gradually shedding loads. Using this method, power compensation can be utilised and has more time to lower the power deficit so as to reduce the load-shedding amount. Secondly, to increase the response rate and enhance the reliability of our method, a multicast metropolis schedule based on TDMA (MMST) is developed. In this protocol, time slots are dedicatedly allocated and a checking and retransmission mechanism is utilised. Finally, the proposed solution is evaluated by NS3-Matlab co-simulator. The numerical results demonstrate the feasibility and effectiveness of our solution.