Analysis and Design of DC-Bus Voltage Controller of Energy Storage Systems in DC Microgrids

Abstract

In this paper, a novel voltage controller of energy storage system (ESS) in DC microgrids (DC-MG) is proposed to enhance the DC-bus voltage stability. At first, a mathematical model of the DC-MG is developed in a state-space form. Then, the voltage controller of the ESS is designed by using the methodology of the IDA-PBC (interconnection and damping assignment-passivity-based control) with an integral action. System stability has been analyzed with passivity-based stability criterion (PBSC). The proposed controller gives the robust performance to the parameters variation. The validity of the proposed control scheme has been verified by the hardware-in-the-loop simulation (HILS) results.INDEX TERMS Active damping, DC microgrids, DC-bus voltage stability, ESS, IDA-PBC.

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

“…Generally, AC voltage droop solutions are expandable to the DC-droop as well [78]. DC droop is applied in ESs and DGs, which are discussed in [51], [170], [62], [61], [171]- [174]. FLC utilization for adaptive DC-droop control in DGs and DSs is studied in [175]- [177].…”

Robust Centralized Control for DC Islanded Microgrid Considering Communication Network Delay

“…Lemma 3: Forŵ = 0 (i.e., absence of exogenous disturbances), the prediction vector (14) for h = τ is given by…”

“…Remark: The prediction vector Equation (14) or (15) can be calculated from the past values inputs of τ ms and the and current state. The integral and the exponential term in Equation (15) can obtained by fast processor at each step which is then multiplied with the gain K P∞ .…”

“…The load can be a DC or an AC load. In the case of DC microgrids (DCMGs), the components are interconnected via a DC Bus [5], [14], [15]. From the perspective of operation, a DCMG can be classified into two modes: grid-connected mode and islanded mode [5], [15].…”

Design of Passivity-Based Damping Controller for Suppressing Power Oscillations in DC Microgrids

“…In [23], the IDA-PBC has been applied to the controller design for the source-side dual active bridge (DAB) DC/DC converters in MVDC microgrids, where the controller is designed based on the mathematical model of the DAB converter. Recently, a DC-bus voltage and inner current control scheme for the ESS in DC microgrids has been proposed in [24], [25], which requires additional devices using communication lines for a damping of the voltage oscillations.…”