A Control Method for Inverter-Based Islanded Microgrids Based on V-I Droop Characteristics

Abstract

Microgrids performance and stability mostly depend on power flow control strategy. In order to allow for a coordinated control while maintaining a reliable operation, decentralized control methods based on P and Q droop characteristics have been utilized. Inherently, the power droop control methods have slow dynamics. In this paper, a novel control method based on V-I characteristics is introduced to exploit the flexibility and fast dynamics of the inverter-based Distributed Energy Resources (DERs). In the proposed method, the direct and quadrature axis voltage components are drooped with the corresponding currents according to a piecewise linear droop function. Eigenvalue analysis of a sample microgrid shows that the proposed method features faster dynamics and improved damping compared to the conventional droop scheme. Simulation results are presented to verify the efficacy of the proposed method.

Experimental testing and model validation of a decoupled‐phase on‐load tap‐changer transformer in an active network

“…To cite the paper please use the doi provided on the Digital Library page. 8 composed by 2 steps ∆V step and that the tap selector concatenates about ±12 turns. Therefore it has been possible to conclude that the voltage difference caused by a single turn is very limited, justifying an inconstancy of the measured ∆V step and delay-times.…”

“…Moreover, at either terminal of the cable, the voltage unbalance factor (VUF) has been calculated. Equation (8) describes the VUF, defined as the ratio between the negative and the positive voltage components in percent [26].…”

“…To address this problem, many inverter-based solutions are proposed in [3], [4] and [8], [17] and [18]. Alternatively, as innovative solution, particular attention is given to the decoupled-phase OLTC technology, which could allow a reduction of the unbalance conditions in distribution grids, as demonstrated in [19] and [20].…”

An Improved Droop Control Strategy for Low-Voltage Microgrids Based on Distributed Secondary Power Optimization Control

“…The operation features of converter-based DGs are different with the conventional synchronous generators, such as fast response and low inertia [1][2][3][4].…”

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

“…Compared with the SGs in power plants, converter-based DGs have inherent features: fast response and less-inertia. Thus, in islanded microgrid, converter-based DGs can be treated as controlled voltage sources [3][4][5].…”