Enhanced Control for Improving the Operation of Grid-Connected Power Converters under Faulty and Saturated Conditions

Abstract

In renewable energy based systems Grid-Connected Voltage Source Converters (GC-VSC) are used in many applications as grid-feeding converters, which transfer the power coming from the renewable energy sources to the grid. In some cases, the operation of GC-VSC may become unstable or uncontrollable due to, among others: a grid fault or an inappropriate current-power reference, that give rise to fast electrical transients or a saturation of the controller. In this paper, an improved control scheme is proposed to enhance the controllability of GC-VSC in all these situations. This solution consists of two parts, on the one hand a new Proportional-Resonant (PR) controller with anti-windup capability to be used as current controller, and secondly a new current/power reference modifier, which defines the suitable reactive current/power reference to keep the system stable. It is worth to mention that the proposed scheme does not need information about the grid parameters as it only uses the converter current, and the voltage at the capacitors of Inductor-Capacitor (LC) output filter.

Control and Validation of a Reinforced Power Conversion System for Upcoming Bioelectrochemical Power to Gas Stations

“…The suggested anti-windup scheme for the PR controller consists of three main parts (see Figure 9): AC limiter, anti-windup for the resonant controller in fundamental frequency, and anti-windup for resonant controllers in the other frequencies. The AC limiter (ACL) to limit the input of SM can be considered as [32]:…”

“…This represented a milestone for the development of likely processes, producing different added-value chemicals and fuels from CO 2 and renewable energy surplus [17]. The process is performed under mild operational conditions (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) • C and atmospheric pressure) and is driven by electroactive microorganisms, without the need of an expensive catalyst, meaning higher energy efficiency and potentially lower construction and operational costs compared to chemical methanation [18]. Thus, P2G based on EMG-BES represents an innovative and flexible energy storage technology for renewable energy surplus (RES) management.…”

Enhanced performance controller for high power wind converters connected to weak grids

“…In this paper, a new analytical anti‐saturation scheme is proposed, based on a reference modifier. The proposed method by authors in [36] can adjust the reactive current reference, according to (7), taking into account the grid conditions and the operation points, with no need to know the grid impedance or the voltage where the maximum phase voltage V imax is equal to .…”

Smart AC Storage based on Microbial Electrosynthesis Stack

“…6): AC limiter, antiwindup for resonant controller in fundamental frequency, and anti-windup for resonant controllers in the other frequencies. The AC limiter (ACL) to limit the input of SM can be considered as [19]: With this limiter, the input of SM has no clamp and it is at all times sinusoidal. The value of Omax is chosen based on the switching method.…”