Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"Virtual impedance"”.
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Advanced Power Sharing Scheme under Unbalanced and Nonlinear Loads in an Islanding Microgrid
… voltage and current controllers, and virtual impedance control loop. Virtual impedance loop for positive and negative sequences of fundamental and harmonic components is used to achieve better power sharing of reactive, unbalance and harmonic powers. The design procedure of the …
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Learning control of bipedal dynamic walking robots with neural networks
… with a supervised learning mode. Generalized Virtual Model Control (GVMC) is also proposed in this thesis, which is inspired by a bio-mechanical model of locomotion, and is an extension of ordinary Virtual Model Control. Instead of adding virtual impedance components to the biped skeletal …
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Improvement of Stability of a Grid-Connected Inverter with an LCL filter by Robust Strong Active Damping and Model Predictive Control
… of the capacitor current is equivalent to virtual impedance connected in parallel with the filter capacitor. In a digitally controlled system, the computation delay causes the equivalent resistance of the virtual impedance to become negative in the frequency range of fs/6 to fs/2, which …
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Systematic control strategy for inverter-based microgrids
… stability certificates are derived along with virtual impedance methods for local and global stability enhancement. Detailed discussions are carried out on the control design that aims at achieving both droop stability and controller robustness. Finally, a power and energy management scheme …
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Transmission grid strength analysis and operation of inverter-based microgrids
… This work presents an adaptive negative-sequence virtual impedance control which allows inverters to inject negative-sequence current proportionally to their capacities. Simulation results show that inverters with the proposed method regulate both positive- and negative-sequence currents as …
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Μελέτη μετατροπέα πηγής τάσης για διασύνδεση μικροπαραγωγών σε μικροδίκτυα, με δυνατότητα "σύνδεσης και λειτουργίας" και απόσβεση αρμονικών
Η παρούσα διατριβή αφορά τη μελέτη ενός εργαστηριακού μετατροπέα πηγής τάσης για τη διασύνδεση μονάδων παραγωγής σε μικροδίκτυα, τη δυνατότητα της επίτευξης «σύνδεσης και λειτουργίας» και τη βελτίωση της ποιότητας ισχύος μέσω της απαλοιφής ανώτερων αρμονικών. Οι στόχοι της παρούσας διατριβής είναι: …
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Facilitating seamless transitions in flexible microgrids: A unified control systems framework for enabling multi-mode inverters
The increasing integration of renewable energy sources into the power grid offers both opportunities and challenges for grid performance, stability, and reliability. Inverter-based microgrids offer a promising solution for the large-scale integration of renewable resources, which often come with a …