Albertus Johannes Malan
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View article: Bridging Continuous-time LQR and Reinforcement Learning via Gradient Flow of the Bellman Error
Bridging Continuous-time LQR and Reinforcement Learning via Gradient Flow of the Bellman Error Open
In this paper, we present a novel method for computing the optimal feedback gain of the infinite-horizon Linear Quadratic Regulator (LQR) problem via an ordinary differential equation. We introduce a novel continuous-time Bellman error, de…
View article: Passivation of Clustered DC Microgrids With Non-Monotone Loads
Passivation of Clustered DC Microgrids With Non-Monotone Loads Open
In this article, we consider the problem of voltage stability in dc networks containing uncertain loads with non-monotone incremental impedances and where the steady-state power availability is restricted to a subset of the buses in the ne…
View article: Passivation of Clustered DC Microgrids with Non-Monotone Loads
Passivation of Clustered DC Microgrids with Non-Monotone Loads Open
In this paper, we consider the problem of voltage stability in DC networks containing uncertain loads with non-monotone incremental impedances and where the steady-state power availability is restricted to a subset of the buses in the netw…
View article: Passivity-Based Power Sharing and Voltage Regulation in DC Microgrids With Unactuated Buses
Passivity-Based Power Sharing and Voltage Regulation in DC Microgrids With Unactuated Buses Open
In this article, we propose a novel four-stage distributed controller for a dc microgrid that achieves proportional power sharing and average voltage regulation for the voltages at actuated and unactuated buses. The controller is presented…
View article: A Unifying Passivity-Based Framework for Pressure and Volume Flow Rate Control in District Heating Networks
A Unifying Passivity-Based Framework for Pressure and Volume Flow Rate Control in District Heating Networks Open
A fundamental precondition for the operation of district heating networks (DHNs) is a stable hydraulic behavior. However, the ongoing transition toward a sustainable heat supply, especially the rising integration of distributed heat source…
View article: Passivity-Based Economic Ports for Optimal Operation of Networked DC Microgrids
Passivity-Based Economic Ports for Optimal Operation of Networked DC Microgrids Open
International audience
View article: Passivity-based economic ports for optimal operation of networked DC microgrids
Passivity-based economic ports for optimal operation of networked DC microgrids Open
In this paper, we introduce the novel concept of economic ports, allowing modular and distributed optimal operation of networked microgrids. Firstly, we design a novel price-based controller for optimal operation of a single microgrid and …
View article: On MPC-based Strategies for Optimal Voltage References in DC Microgrids
On MPC-based Strategies for Optimal Voltage References in DC Microgrids Open
International audience
View article: A Unifying Passivity-Based Framework for Pressure and Volume Flow Rate Control in District Heating Networks
A Unifying Passivity-Based Framework for Pressure and Volume Flow Rate Control in District Heating Networks Open
A fundamental precondition for the secure and efficient operation of district heating networks (DHNs) is a stable hydraulic behavior. However, the ongoing transition towards a sustainable heat supply, especially the rising integration of d…
View article: On MPC-based Strategies for Optimal Voltage References in DC Microgrids
On MPC-based Strategies for Optimal Voltage References in DC Microgrids Open
Modern power systems are characterized by low inertia and fast voltage dynamics due to the increase of sources connecting via power electronics and the removal of large traditional thermal generators. Power electronics are commonly equippe…
View article: Port-Hamiltonian Modelling for Analysis and Control of Gas Networks
Port-Hamiltonian Modelling for Analysis and Control of Gas Networks Open
In this paper, we present finite-dimensional port-Hamiltonian system (PHS) models of a gas pipeline and a network comprising several pipelines for the purpose of control design and stability analysis. Starting from the partial differential…
View article: Passivity-based power sharing and voltage regulation in DC microgrids with unactuated buses
Passivity-based power sharing and voltage regulation in DC microgrids with unactuated buses Open
In this paper, we propose a novel four-stage distributed controller for a DC microgrid that achieves power sharing and average voltage regulation for the voltages at actuated and unactuated buses. The controller is presented for a DC micro…
View article: Port-Hamiltonian Modelling for Analysis and Control of Gas Networks
Port-Hamiltonian Modelling for Analysis and Control of Gas Networks Open
In this paper, we present finite-dimensional port-Hamiltonian system (PHS) models of a gas pipeline and a network comprising several pipelines for the purpose of control design and stability analysis. Starting from the partial differential…
View article: Port-Hamiltonian Modeling of Hydraulics in 4th Generation District Heating Networks
Port-Hamiltonian Modeling of Hydraulics in 4th Generation District Heating Networks Open
In this paper, we use elements of graph theory and port-Hamiltonian systems to develop a modular dynamic model describing the hydraulic behavior of 4th generation district heating networks. In contrast with earlier generation networks with…
View article: Fractional Systems’ Identification Based on Implicit Modulating Functions
Fractional Systems’ Identification Based on Implicit Modulating Functions Open
This paper presents a new method for parameter identification based on the modulating function method for commensurable fractional-order models. The novelty of the method lies in the automatic determination of a specific modulating functio…
View article: A Unified Passivity-Based Framework for Control of Modular Islanded AC Microgrids
A Unified Passivity-Based Framework for Control of Modular Islanded AC Microgrids Open
Voltage and frequency control in an islanded AC microgrid (ImGs) amount to stabilizing an a priori unknown ImG equilibrium induced by loads and changes in topology. This paper puts forth a unified control framework which, while guaranteein…
View article: A Unified Passivity-Based Framework for Control of Modular Islanded AC\n Microgrids
A Unified Passivity-Based Framework for Control of Modular Islanded AC\n Microgrids Open
Voltage and frequency control in an islanded AC microgrid (ImGs) amount to\nstabilizing an a priori unknown ImG equilibrium induced by loads and changes in\ntopology. This paper puts forth a unified control framework which, while\nguarante…
View article: Passivity Conditions for Plug-and-Play Operation of Nonlinear Static AC\n Loads
Passivity Conditions for Plug-and-Play Operation of Nonlinear Static AC\n Loads Open
The complexity arising in AC microgrids from multiple interacting distributed\ngeneration units (DGUs) with intermittent supply behavior requires local\nvoltage-source inverters (VSIs) to be controlled in a distributed or\ndecentralized ma…
View article: A Scalable Port-Hamiltonian Approach to Plug-and-Play Voltage Stabilization in DC Microgrids
A Scalable Port-Hamiltonian Approach to Plug-and-Play Voltage Stabilization in DC Microgrids Open
One of the major challenges of voltage stabilization in DC microgrids are the large system scale and multiple interacting components. In recent publications, this has been addressed by a scalable and decentralized control design method ref…