An indirect matrix converter-based unified power quality conditioner for a PV inverter with enhanced power quality functionality

Abstract

Abstract-This paper introduces an Indirect Matrix Converter (IMC)-based Unified Power Quality Conditioner topology for a Photovoltaic (PV) system and sensitive load, with enhanced Power Quality functionalities. In particular, the proposed system is able to compensate grid voltage sags, swells and harmonics in the sensitive load, and non-linear load current harmonics in the Low-Voltage (LV) grid, in addition to the common PV inverter functionalities. The modulation of the shunt converter is developed specifically to control the PV array current and the grid currents amplitude, as opposed to the common IMC modulation methods. The IMC modulation is synchronized with the series inverter modulation in order for the system to operate as a whole. Simulation results are presented to confirm the proper operation of the system under a variety of operating conditions.

On the Potential Contributions of Matrix Converters for the Future Grid Operation, Sustainable Transportation and Electrical Drives Innovation

“…Instead of using a single shunt converter or the most common VSIs for the shunt and series connections to the grid, it is also possible to connect the PV array to the SG using an IMC [67,71], as shown in Figure 12. The PV array is inserted on the virtual 'dc link' of the IMC and the system overall guarantees improved compactness and higher reliability, due to the absence of a bulky electrolytic capacitor in the dc link [72][73][74][75].…”

“…The shunt converter, This unidirectional 3 × 2 matrix converter topology can be used to compensate PQ issues in the connection of PV arrays to the SG with current harmonics compensation [54] and fault voltage ride-through (FVRT) capability [66]. However, the compensation capability of a shunt-connected converter is limited, therefore PV converter topologies including shunt and series connections to the SG for current and voltage compensations have been considered in the literature [67][68][69]. This leads to a unified power quality conditioner (UPQC) topology [70] where the PV array is connected to the dc link.…”

Direct control method for a PV system integrated in an Indirect Matrix Converter-based UPQC

“…This contrasts with the non-direct control method developed in [6] and leads to a simpler implementation with faster control-the choice of the best control action is guaranteed regardless of the DC link variables. Still, a specific attention is paid to the modulation of the DC link voltage.…”

“…However, in order to allow for a better voltage compensation, the system developed in this paper uses shunt and series converters for current and voltage compensation, respectively, forming a Unified Power Quality Conditioner (UPQC)-based topology [2], with a PV array inserted in the DC link [3], [6], [7]. An Indirect Matrix Converter (IMC) is used to form the UPQC, resulting in a direct connection between the equivalent shunt and series converters, without bulky DC-link storage capacitor, benefitting from the common advantages of Matrix Converters (MCs) [8].…”

Indirect Matrix Converter-Based Grid-Tied Photovoltaics System for Smart Grids

“…In this paper the use of a UPQC with integrated PV array (PV-UPQC) is investigated [24][25][26]. Instead of the more common shunt and series Voltage-Source Converters (VSCs) an Indirect Matrix Converter (IMC) is proposed to form the UPQC, guaranteeing improved compactness [27] and higher reliability [28] that result from the absence of a bulky dc link electrolytic capacitor [12,27,29,30] or an additional film capacitor with increased system complexity.…”