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This paper presents a single-phase voltage source converter (VSC) control structure for exchanging active power with a weak grid during network frequency events. The system selected for study is a single-phase domestic electric vehicle (EV) charger. The chargers operate near the converter limit during charging which is higher than the linear region of the power transmission curve. Hence, any alteration in power flow can cause large voltage deviations at the point of common coupling (PCC) due the high network impedance. Thus, preventing the converter from reacting to grid frequency transients. The control system is implemented by determining the non-linear relationship that links the real and imaginary current components to provide increased reactive power to support the PCC voltage during active power deviations. The controller is tested for both power and frequency steps to ensure the voltage remains within acceptable limits throughout for a range of short circuit ratios (SCRs). A discussion of key findings is provided, and the inertial response is characterised using a first-order approximation.
|Number of pages||7|
|Publication status||Published - 15 Dec 2020|
|Event||The 10th International Conference on Power Electronics, Machines and Drives - Nottingham, United Kingdom|
Duration: 15 Dec 2020 → 17 Dec 2020
|Conference||The 10th International Conference on Power Electronics, Machines and Drives|
|Period||15/12/20 → 17/12/20|
- Virtual Inertia
- weak grid
- Single-phase VSC
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1/10/19 → 1/04/23
Project: Research Studentship - Internally Allocated