Power System Monitoring and Control

10Microgrid Control: Synthesis Examples

In Chapter 9, the concept of the microgrid (MG) was explained. The MG control loops are divided into four control levels: primary, secondary, global, and central/emergency controls. In this chapter, some design examples for these control levels are briefly discussed. Interested readers can find more details in the authors' previous publications [1–18].

10.1 Local Control Synthesis

10.1.1 Robust Voltage Control Design [4]

As an example for local control design, this section addresses a robust voltage control synthesis technique based on Kharitonov's theorem for an isolated MG. Here, a simple PI structure is used for the voltage controller; however, the PI parameters are tuned by Kharitonov's theorem and the D-stability concept [19]. The proposed PI voltage controller endeavors to minimize errors between direct and quadrature voltage components and their reference values in the presence of parametric uncertainties.

10.1.1.1 Case Study

Schematic diagram of an isolated MG as the case study is illustrated in Fig. 10.1. It contains a DC voltage source, a DC–AC converter interfaced between the DC voltage source and distribution lines, a filter represented by and parameters to extract fundamental frequency of terminal voltage, a three-phase local ...