Doctor Jonathan Mayo-Maldonado

Dr Jonathan Mayo-Maldonado

Lecturer in Electronic Engineering

Research interests

  • Power converter control, with an emphasis on controllers that remain stable and performant un…

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Accepting applications from PhD students.

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About

Jonathan Mayo-Maldonado works on control theory for power and energy systems, with a particular focus on power converter control in electric vehicles, renewable energy applications, and electrical machines and drives. His work sits where fast switching devices meet slow physical infrastructure: the converter acts in microseconds, yet its decisions ripple across components that age, heat, and respond over far longer horizons. For that reason, his research develops modelling and control methods that remain suitable for implementation, not only in idealised settings but also under the practical constraints that define real deployment. Alongside control design, he develops fault detection and diagnosis techniques intended to improve reliability and operational resilience, so that performance is not treated as an average-case achievement but as something that must hold when conditions become adverse.

A second major strand of his work concerns medium- and low-voltage distribution networks, especially under high renewable penetration. As these networks become more actively managed, their behaviour is shaped less by fixed infrastructure and more by decisions made at the edge: inverter-interfaced generation, storage, and flexible demand responding to local objectives and external signals. In this setting, he studies how network resilience can be improved through coordinated power injections, active control strategies for prosumers, and monitoring schemes that detect faults early and support informed operational decisions. The emphasis is on practical network conditions, where operating points change frequently, measurements are limited or unevenly distributed, and uncertainty is present in both models and data. Rather than treating these complications as exceptions, his work treats them as the starting point for design: if a method cannot cope with changing regimes and partial observability, it will struggle precisely when operators need it most.

These two strands are tightly connected. Converter control determines how individual devices interact with the network, while network conditions shape what those converters must tolerate and how they should respond. A disturbance that begins as a local sensor fault can propagate as voltage instability; a cyber-induced delay that looks minor in a laboratory setup can alter coordination across many inverters; an unmodelled constraint in a drive system can become a network-level operational problem when thousands of similar devices act at once. His research is motivated by this coupling: understanding, and then shaping, the feedback loop between device-level decisions and network-level consequences.

Methodologically, he uses nonlinear and linear control tools from both model-based and model-free viewpoints, selecting the approach according to what can be justified and what can be validated. Where strong physics-based structure is available, he uses it to make assumptions explicit and to retain interpretability in the resulting controllers. Where uncertainty, drift, or operational variability dominate, he uses data-driven control and monitoring approaches for power electronics, distribution networks, and electrical machines, in which measurement data supports control design, improves diagnostics, and strengthens performance under uncertainty. The goal is not to replace models with data, but to connect them: models provide mechanisms and constraints, while data provides evidence about how the system is behaving now and how far reality has moved from the nominal description.

More recently, his research has expanded to cybersecurity in critical energy infrastructure, treating cyber events as disturbances that can affect sensing, communication, and closed-loop behaviour. This extension follows naturally from the increasing reliance of modern power systems on digital measurement streams and coordinated control actions. When control depends on communication, timing, and software, the boundary between “fault” and “attack” becomes less clear, and both can undermine stability through similar pathways: corrupted measurements, manipulated setpoints, delayed signals, and loss of coordination. In response, he develops detection techniques, rejection mechanisms, and resilient countermeasures integrated into control and monitoring design, with the aim of maintaining safe operation under realistic threat and fault scenarios. The emphasis is practical and testable: security measures should not sit beside the control system as an afterthought, but should be designed so that the closed loop remains credible when data is imperfect, when components misbehave, and when the system is pushed into the regimes where guarantees matter most.