A generalized droop‐based compensator for addressing the issues raised in a DC microgrid comprising hybrid wind‐battery‐back up generation sources

Abstract

Summary This paper deals with the improvement of stability margin, dynamic behavior, and steady state performance of a direct current (DC) microgrid system consisting of wind energy sources, battery energy storage, and back up generation source. The DC microgrid control system should set the DC bus voltage at the allowable range and provide proper load sharing among generation sources. Accurate load sharing, proper voltage regulation, and dynamic stability of the system at presence of constant power loads (CPLs) are the main problems that may be raised in operation of DC microgrid systems. In order to address these issues, this paper proposes a generalized droop‐based compensator that not only stabilizes the DC microgrid dynamics at high penetration of CPLs, but also addresses the issues such as inaccurate load sharing and improper voltage regulation. The proposed generalized droop‐based compensator comprises three parts: the first part enhances the DC microgrid stability even at high penetration of CPL, the second part compensates the transmission lines voltage drops and improves the function of voltage regulation, and the third part performs proper load sharing among different generation sources. At the end, capability of the proposed compensator is examined by frequency response analysis and time domain simulations.

A comprehensive review on control techniques for stability improvement in microgrids

“…The controller deals with the power electronic interfaced DERs for minimizing the system transients while maintaining voltage and angle stability of the DERs. Considering the issue of high load penetration, voltage fluctuations, and load sharing, a centralized droop‐based compensator for maintaining the MG stability has been used 93 . The controller manages the system voltage while maintaining the stability via load shedding/sharing between various DGs.…”

A review on control strategies for microgrids with distributed energy resources, energy storage systems, and electric vehicles

“…The references for inner control loop are provided by primary control with grid following and grid forming architectures 24‐27 . In case of isolated DC microgrids, droop control strategies are based on active power/voltage (P/V) without any communication links 28‐30 . In low voltage DC (LVDC) microgrids, line impedance is resistive.…”

An accurate current sharing method for an Islandeddroop‐controlled dcmicrogrid without communication between remote buses

“…Increased penetration of DC loads and sources and availability of advanced power electronic converters are making DC microgrid (DCMG) a viable and attractive option. [1][2][3][4][5][6][7][8][9][10] Researchers have focused on developing a suitable control strategy for reliable and stable operation of a DCMG. Droop control strategy at the primary control level has emerged as the most popular choice for autonomous and secure load sharing in a DCMG.…”