Abstract
This paper presents a current suppression method based on a droop control strategy under distorted grid voltage with inter-harmonics and fundamental frequency fluctuation. In this proposed strategy, the current incomplete derivation controller is employed to decrease the negative impact caused by harmonic and inter-harmonic grid voltage. This method provides a good dynamic response and has low complexity against the inter-harmonics with unfixed fundamental frequency. Based on a mathematical model of the grid-connected inverter, we designed novel instantaneous frequency detection and feed-forward methods to suppress the grid fundamental frequency fluctuation impacts. Then the main parameters were analyzed. The simulation and experimental results verified the feasibility and effectiveness of the proposed method.
Highlights
Droop control has been widely used for microgrid inverters, but its performance is rarely considered for future electronic-based power systems
In order to enhance the capability for suppression of inter-harmonic current for a grid-connected inverter with droop control strategy, this paper presents a harmonic current suppression strategy for a grid-connected inverter based on incomplete current derivation feedback
Coordinate transformation: proposed control strategy is developed under the dq voltage reference in the The dq frame comprises of the output fundamental frequency frame, the fundamental parts behave as dc components and the electrical angle voltage UPI, decoupling component jωLIdq, and harmonic voltage Uh, as shown in Figure of the fundamental grid voltage is obtained by uq after a low-pass filter, as shown in
Summary
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