Artículo de publicación ISIThe increasing interest in integrating intermittent
renewable energy sources into microgrids presents major challenges
from the viewpoints of reliable operation and control. In
this paper, the major issues and challenges in microgrid control
are discussed, and a review of state-of-the-art control strategies
and trends is presented; a general overview of the main
control principles (e.g., droop control, model predictive control,
multi-agent systems) is also included. The paper classifies microgrid
control strategies into three levels: primary, secondary, and
tertiary, where primary and secondary levels are associated with
the operation of the microgrid itself, and tertiary level pertains
to the coordinated operation of the microgrid and the host grid.
Each control level is discussed in detail in view of the relevant
existing technical literature
Expansion planning models are often used to support investment decisions in the power sector. Towards the massive insertion of renewable energy sources, expansion planning of energy storage systems (SEP-Storage Expansion Planning) is becoming more popular. However, to date, there is no clear overview of the available SEP models in the literature. To shed light on the existing approaches, this review paper presents a broad classification of SEP, which is used to analyze a database of about 90 publications to identify trends and challenges. The trends we found are that while SEP was born more than four decades ago, only in the last five years increasing research efforts were put into the topic. The planning has evolved from adequacy criteria to broader targets, such as direct costs, mitigation of CO2 emissions, and renewable integration. The modeling of the network, power system, energy storage systems (ESS), and time resolution are becoming more detailed. Uncertainty is often considered and the solution methods are still very diverse. As outstanding challenges, we found that (1) the large diversity of ESS, in contrast to conventional generation technologies, and (2) the complex lifetime and efficiency functions need to be addressed in the models. (3) Only a high temporal and spatial resolution will allow for dimensioning the challenge of integrating renewables and the role of ESS. (4) Although the value of ESS lies beyond shifting energy in time, current SEP is mostly blind to other system services. (5) Today, many flexibility options are available, but they are often assessed separately. In the same line, although cross-sectorial (power, heat, transport, water) SEP is becoming more frequent, there are many open tasks towards an integrated coordination. The planning of future energy systems will be multi-sectorial and multi-objective, consider the multi-services of ESS, and will inherently require interdisciplinary efforts.
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