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Power quality has become a key issue in modern electric power systems due to the increasing number of sensitive loads and disturbing sources. In this scenario, electronic power converters are commonly used to compensate voltage and current disturbances, above all in relation with harmonics. These devices require sophisticated control systems like Proportional Resonant Controllers (PRCs) that must...
The high penetration of renewable energy sources in electrical distribution networks is giving rise to new challenges in the low voltage network operation. Power electronics converters are widely used to connect these energy resources to the grid, and the control technique that emulates the operation of synchronous generators is attracting the attention of researchers in recent years. Such converters...
The role of inertia emulation and voltage control is fundamental to support the integration of distributed generation in weak power grids and Virtual Synchronous Machines (VSMs) represent an attractive solution to assume both of these roles. However, VSMs act as voltage sources and this makes it difficult to address power quality issues. Virtual impedances are commonly applied in the literature to...
The emulation of synchronous machines is an attractive solution to improve the integration of distributed energy resources in weak grids. In this sense, synchronverters have been widely analysed in the literature, but their digital implementation has been seldom studied. This paper presents the discrete-time implementation of the control algorithms for a battery-supported synchronverter in a weak...
LCL filters are commonly used to connect Voltage Sourced Converters (VSCs) to the grid. This type of filters are cheaper than a single inductor, but they can generate resonance problems if no active or passive damping method is used. Active damping methods are becoming popular in the literature because they improve efficiency, but they are sometimes difficult to implement and additional measurements...
An increased deployment of distributed generation in recent years has contributed to creation of meshed power networks usually seen as a way to improve power flow management capability. Also, power electronics converters have been commonly used to interface distributed resources to the grid, yet their impact on the network stability has not been sufficiently explored. In this paper the stability of...
This paper introduces an automated and reconfigurable laboratory environment for rapid prototyping of DC and AC microgrids. The laboratory includes seven fully programmable power converters, 47.5 kWh lithium-ion battery, configurable AC loads, a set of AC busbars with configurable network impedances between them, a set of DC busbars and relevant monitoring and control equipment. Each laboratory element...
A novel modelling method and a stability analysis procedure for weak power networks with high penetration of power electronics converters are proposed in this paper. The modeling approach can be applied to any network topology and in order to model of the complete network it introduces small-signal state-space models for each network component including power lines, loads, power converters and their...
In this paper a novel unified modelling and control procedure for Back-to-Back converters is introduced. The proposed procedure captures in a single state-space model detailed converter dynamics of both LCL filters and DC-capacitor. A linear multivariable approach has been identified as the most suitable control strategy for taking full advantage of the unified model. A state-feedback controller has...
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