A power calculation algorithm for single-phase droop-operated-inverters considering linear and nonlinear loads HIL-assessed

Jorge El Mariachet*, Jose Matas, Helena Martín, Mingshen Li, Yajuan Guan, Josep M. Guerrero

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

9 Citationer (Scopus)
40 Downloads (Pure)

Abstract

The active and reactive powers, P and Q, are crucial variables in the parallel operation of single-phase inverters using the droop method, introducing proportional droops in the inverter output frequency and voltage amplitude references. P and Q, or P-Q, are calculated as the product of the inverter output voltage and its orthogonal version with the output current, respectively. However, when sharing nonlinear loads these powers, Pav and Qav, should be averaged by low-pass filters (LPFs) with a very low cut-off frequency to avoid the high distortion induced by these loads. This forces the droop method to operate at a very low dynamic velocity and degrades the system stability. Then, different solutions have been proposed in literature to increase the system velocity, but only considering linear loads. Therefore, this work presents a method to calculate Pav and Qav using second-order generalized integrators (SOGI) to face this problem with nonlinear loads. A double SOGI (DSOGI) approach is applied to filter the nonlinear load current and provide its fundamental component to the inverter, leading to a faster dynamic velocity of the droop-based load sharing capability and improving the stability. The proposed method is shown to be faster than others in the literature when considering nonlinear loads, while smoothly driving the system with low distortion levels. Simulations, hardware-in-loop (HIL) and experimental results are provided to validate this proposal.
OriginalsprogEngelsk
Artikelnummer1366
TidsskriftElectronics (Switzerland)
Vol/bind8
Udgave nummer11
Antal sider19
ISSN2079-9292
DOI
StatusUdgivet - nov. 2019

Fingeraftryk

Dyk ned i forskningsemnerne om 'A power calculation algorithm for single-phase droop-operated-inverters considering linear and nonlinear loads HIL-assessed'. Sammen danner de et unikt fingeraftryk.

Citationsformater