Multidimensional droop control for wind resources in dc microgrids

Abstract

The inclusion of electricity generation from wind in microgrids presents an important opportunity in modern electric power systems. Various control strategies can be pursued for wind resources connected in microgrids, and droop control is a promising option since communication between microgrid components is not required. Traditional droop control does have the drawback of not allowing much or all of the available wind power to be utilized in the microgrid. This paper presents a novel droop control strategy, modifying the traditional approach and building an optimal droop surface at a higher dimension. A method for determining the optimal droop control surface in multiple dimensions to meet a given objective is presented. Simulation and hardware-in-the-loop experiments of a sample microgrid show that much more wind power can be utilized, while maintaining the system's bus voltage and still avoiding the need for communication between the various components.

Optimal Multidimensional Droop Control for Wind Resources in DC Microgrids

“…The numeric values used for this microgrid model are shown in Table 1. The full state model and proportional-integral control design are presented in [19].…”

“…This section will compare the use of linear, planar and optimal multidimensional droop control with an example residential-scale microgrid. The details of the modeling method used for each component in the microgrid can be found in [19], and the full microgrid model is shown in Figure 13. The full example microgrid was simulated three times: first with traditional linear droop control, then with multidimensional droop control using a plane and, finally, with optimal multidimensional droop control using a surface.…”

“…Previous work has demonstrated the use of multidimensional droop control with wind resources, where a plane is used for the droop control relationship rather than the traditional line [19]. Related work has presented a method for finding an optimal droop control relationship in two dimensions to meet a given objective [20].…”

A Hierarchical Control Methodology for Renewable DC Microgrids Supporting a Variable Communication Network Health

“…The proposed method has been verified through mathematical analysis, simulation, and experimental results.Electronics 2018, 7, 418 2 of 20 conceive a viable system that can share the load and that works in parallel with the conventional power grid. Conventional grids contain renewable energy resources as well as conventional generation units and loads which make the system more complicated [4][5][6].The inclusion of RES-based DC microgrids at the distribution level appeals more to system designers due to a greater penetration of electric vehicles and energy storage units. Furthermore, the microgrids provide simpler control methods for operation, where most consumer loads are fundamentally drawing DC current at the consumer level [7,8].…”

“…Electronics 2018, 7, 418 2 of 20 conceive a viable system that can share the load and that works in parallel with the conventional power grid. Conventional grids contain renewable energy resources as well as conventional generation units and loads which make the system more complicated [4][5][6].…”