Smart microgrids differ from conventional distribution networks in ways that make traditional control theory strained. They juggle intermittent solar and wind generation, battery storage, controllable loads, and the possibility of disconnecting from the main grid and operating as an island. Every one of these elements introduces uncertainty that a fixed, pre-programmed controller handles poorly. Reinforcement learning offers a fundamentally different approach: instead of encoding rules in advance, an agent interacts with the grid environment, receives rewards or penalties based on outcomes such as cost, stability or emissions, and gradually learns a policy that maps observed system states to control actions. In principle, this produces controllers that adapt to conditions their designers never anticipated, from sudden cloud cover to unexpected demand spikes.

The review’s first contribution is organizational. Rather than surveying the literature loosely, the authors impose an explicit taxonomy that classifies each study along six dimensions: the reinforcement learning family used, the control objective pursued, the degree of communication dependency, the level of validation achieved, the cyber-resilience mechanism employed, and the maturity of deployment. This structure reveals patterns that earlier surveys, which typically focused only on energy management, missed. Value-based methods such as Q-learning and its deep variants remain popular for their simplicity, but the synthesis shows that policy-gradient methods and multi-agent architectures consistently offer stronger adaptability under dynamic operating conditions, where the grid’s statistics shift faster than a value function can be reliably re-estimated.

Multi-agent reinforcement learning deserves particular attention because microgrids are naturally distributed systems. When solar inverters, battery controllers, and demand-response actuators each run their own learning agent, the network can continue operating even if one node fails or its communication link drops. The review finds that such decentralized coordination improves scalability and fault tolerance, but it introduces new difficulties: agents must learn policies that remain compatible with one another, convergence guarantees become weaker, and the training process can be unstable when every agent is simultaneously adapting to the changing behavior of its peers. The authors note that federated learning, in which agents share model updates rather than raw operational data, is emerging as a promising middle path that preserves privacy while still capturing collective intelligence across sites.

One of the review’s most distinctive moves is its insistence that control and communication cannot be designed in isolation. Prior surveys, the authors argue, have not jointly analyzed control-communication co-design, adversarial robustness, federated and multi-agent coordination, and simulation-to-real validation under a single reproducible protocol. This matters because every learned control decision in a microgrid travels over a communication network, and that network has finite bandwidth, variable latency and a real probability of packet loss or malicious interference. A controller that performs brilliantly when measurements arrive every 100 milliseconds may destabilize the grid when delays stretch or messages go missing. The taxonomy’s communication-dependency dimension makes these assumptions explicit, allowing researchers to see which algorithms genuinely tolerate degraded networks and which quietly assume ideal conditions that no real deployment provides.

To ground these qualitative comparisons in numbers, the review includes an original illustrative benchmark. The authors coupled demand traces derived from SUMO-RL, a reinforcement learning framework originally built for traffic signal control, to pymgrid, an open-source microgrid simulation platform. Representative reinforcement learning controllers were then compared under normalized control and communication metrics, providing a common yardstick across algorithms that the literature otherwise lacks. The benchmark’s results echo the broader synthesis: policy-gradient and multi-agent variants often adapt more gracefully to dynamic conditions, but their advantages come with higher computational cost, longer training times and greater sensitivity to hyperparameter choices. Simpler methods remain competitive in settings where the operating envelope is narrow and communication is reliable.

The review is equally candid about the gap between simulation and reality, a problem the machine learning community calls Sim2Real transfer. Most published controllers are validated only in software environments whose physics, noise characteristics and failure modes are idealized. A policy trained in such a world may fail in ways that are dangerous rather than merely inconvenient, since microgrid instability can mean blackouts for hospitals, water systems or remote communities. The authors identify high-fidelity cyber-physical digital twins, which model both the electrical dynamics and the communication infrastructure in realistic detail, as a critical missing piece. Until validation practices catch up, they warn, claims of real-world readiness should be treated with caution.

Security emerges as another recurring theme. Because learned controllers depend on sensor data and networked commands, they inherit every vulnerability of industrial control systems and add new ones: an adversary who poisons the reward signal, manipulates observations, or floods the communication channel can steer a learning agent toward harmful behavior. The review catalogs the cyber-resilience mechanisms proposed across the literature, from anomaly detection wrappers to robust training against adversarial perturbations, and finds that adversarial robustness remains underexplored relative to its importance. Safety-constrained reinforcement learning, in which the agent optimizes performance subject to hard limits on voltage, frequency or battery stress, is flagged as a priority area, since unconstrained exploration during training is simply unacceptable on a live power system.

Reproducibility rounds out the review’s list of barriers. The authors observe that many studies report results on bespoke simulation setups with unpublished parameters, making it impossible to compare algorithms fairly or to reproduce published performance. Their own benchmarking protocol, which normalizes both control and communication metrics and uses openly available tools, is offered as a template for how the field could raise its evidentiary standards. Combined with the explicit taxonomy, this gives the community something it has lacked: a shared map of what has been demonstrated, at what validation level, and under what communication assumptions.

The overall picture that emerges is of a technology at an inflection point. Reinforcement learning has proven it can deliver the adaptability that smart microgrids need, and multi-agent, federated and policy-gradient approaches are pushing capability forward on fronts ranging from privacy preservation to decentralized resilience. But the review’s comparative analysis makes clear that trustworthy deployment depends on solving problems that no single algorithm can address alone: communication-aware validation, safety constraints, adversarial defense, and reproducible benchmarking. The authors’ conclusion is measured rather than triumphant, and appropriately so. The grids of the future may well learn, but teaching them to learn safely, verifiably and together is the harder and more important task now facing the field.

Subject of Research: Reinforcement learning-based control, communication and simulation frameworks for smart microgrids

Article Title: Adaptive intelligence in smart microgrids: a systematic review and comparative analysis of RL-based control, communication, and simulation frameworks

Article References: Singh, N., Gupta, K., Singh, A. K., Nallagownden, P., & Elamvazuthi, I. (2026). Adaptive intelligence in smart microgrids: a systematic review and comparative analysis of RL-based control, communication, and simulation frameworks. Artificial Intelligence Review. https://doi.org/10.1007/s10462-026-11663-x

Image Credits: AI Generated

DOI: 10.1007/s10462-026-11663-x

Keywords: smart microgrid, reinforcement learning, deep RL, multi-agent systems, federated learning, communication networks, edge computing, cyber-resilience, digital twins, Sim2Real, energy management, systematic review