Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

An Improved Droop Control Strategy for Grid-connected Inverter Power Stability and Harmonic Suppression Under Grid Fluctuation and Inter-harmonics

Version 1 : Received: 3 June 2021 / Approved: 4 June 2021 / Online: 4 June 2021 (10:48:27 CEST)

How to cite: Xu, W.; Wang, B.; Liu, J.; Li, D. An Improved Droop Control Strategy for Grid-connected Inverter Power Stability and Harmonic Suppression Under Grid Fluctuation and Inter-harmonics. Preprints 2021, 2021060136 (doi: 10.20944/preprints202106.0136.v1). Xu, W.; Wang, B.; Liu, J.; Li, D. An Improved Droop Control Strategy for Grid-connected Inverter Power Stability and Harmonic Suppression Under Grid Fluctuation and Inter-harmonics. Preprints 2021, 2021060136 (doi: 10.20944/preprints202106.0136.v1).

Abstract

This paper presents an improved droop control strategy for grid-connected inverter power stability and power quality under distorted with consideration of grid fluctuation and inter-harmonics. An instantaneous frequency without PLL and amplitude of capacitor voltage feed-forward control strategy is given to power stability control, meanwhile a grid current feedback control is given by an incomplete derivation with a high-pass filter, so that the harmonics and inter-harmonics current can be suppressed. These approaches can provide both good active and reactive power dynamic response under fluctuation of frequency, and rejection ability against harmonic and inter-harmonic voltage. Based on model of inverter, the proposed control strategies are designed in detail. Simulations and experiments are present to validate the effectiveness of proposed method.

Subject Areas

Droop control; micro-grid inverter; grid-connected mode; instantaneous frequency detection; incomplete derivation

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