A new decentralized two-stage multi-objective control of secondary network driven hybrid microgrid under variable generation and load conditions

Abstract

This paper proposes a new decentralized two-stage multi-objectives voltage control technique to ensure the operational stability of the hybrid MG over the variable renewable generations as well as to confirm its reliable operation against various industrial loads by minimizing the mismatch load terminal voltage. The effective operation of hybrid MG under the running of loads reclines on its dynamics which may become non-linear due to the utilization of additional inverter-oriented secondary network or electronics components in their evolution. Also, the efficacy of the secondary network-driven microgrid (SNM) is ascertained by taking the sustained transient response, however, its supremacy can be influenced by the sporadic features of renewable energy sources (RESs). This work introduces a new decentralized hybrid voltage control (DHVC) model to effectively drive the issues raised from the load’s operation and RESs. The proposed hybrid control technique integrates the linear and non-linear control scheme which works enabling a two-level control framework in MG terminal to confirm its enhanced operational stability and minimized unbalance voltage over the various operating conditions. The non-linear control framework of the proposed DHVC is made by utilizing the partial feedback linearization approach in generalized dynamics deriving from the DC–DC converters used with RESs and battery, while the linear control scheme uses a second-order damping (SOD) control framework to regulate the inverter used with load’s network. The controllability of the proposed DHVC is evaluated by measuring the response of the SNM in terms of operational stability and mismatch voltage minimization over the change of meteorological factors of the RESs and various industrial loads. Also, an external parametric uncertainty with the single-phase secondary network dynamics is studied to guarantee the robustness of the proposed DHVC. Additionally, a comparative study is studied to cover the augmented performance of the hybrid microgrid.