Masoud Davari

• Georgia Southern University

Three-phase grid-following (GFL) inverter-based resources (IBRs) play a vital role as an interface for integrating renewable energy resources and flexible loads, such as electric vehicles, into the power grid. This paper introduces a novel set-theoretic adaptive control scheme for the primary control of three-phase GFL IBRs, designed to mitigate th...

Photovoltaic (PV) emulators are designed to reproduce the exact current-voltage characteristic of a PV module or array in different ambient conditions. PV emulators are essential for power converter testing in PV systems, particularly for grid-tied inverters. Certain factors, such as real-time output and simple implementation with high accuracy, sh...

The stability and performance of ac–dc systems in grid modernization heavily rely on the rectification mode of grid-connected voltage-source converters (GC-VSCs). Being considered as the heart of the system, its impact is significant. The current-controlled GC-VSC based on the cascade control using a pulsewidth modulation approach is commonly deplo...

With the increasing number of three-phase grid-following (GFL) inverter-based resources (IBRs) in modern power grids deploying cyber-physical systems, they are required to possess more intelligence with diverse functionality and communication capabilities. However, the cyber threats of smart inverters are omnipresent due to the immense usage of dat...

Testing inverter-based resources (IBRs) is of utmost importance. This paper proposes a novel power hardware-in-the-loop (PHIL) interface control (PHIL-IC) employing a reinforcement-learning approach based on adaptive dynamic programming (ADP, also known as approximate dynamic programming) to enhance the PHIL-simulation-based testing of IBRs by virt...

Grid modernization and large-scale integration of inverter-based resources (IBRs) into distribution systems have resulted in the development of new control strategies relying on information and communication technologies. To this end, this article proposes a distributed secondary control algorithm using an event-triggered mechanism for exchanging i...

When it comes to integrating inverter-based resources (IBRs) into modern grids with varying characteristics like unbalanced systems, low-inertia networks, or very weak grids, synthesizing the synchronization control method (SCM) of the IBR’s phase-locked loop can be a challenging task. This paper provides a unique solution to enhance the three-phas...

This paper investigates the impact of potential state-dependent false data injection cyber-attacks on frequency synchronization and active power management in islanded ac microgrids. One potential way of affecting microgrid reliability is by forcing a generation outage. Thus, the attacker could potentially aim to desynchronize inverter-based resour...

This paper proposes a multivariable, adaptive, robust (MAR) control strategy for islanded inverter-based resources (IBRs) operating as grid-forming inverters. The proposed method is employed in the inner control loop of the primary layer in the hierarchical or decentralized structures for the islanded operation of microgrids. The MAR control scheme...

This article proposes a parallel-connected 40-pulse diode rectifier (40PDR) based on a 20-pulse diode rectifier (20PDR) with a passive pulse multiplication circuit (PPMC) to mitigate harmonics. The PPMC deployed in this article is connected to the 20PDR dc-side and consists of a modified interphase transformer and two single-phase rectifiers. Since...

From a theoretical and practical point of view, in order to increase rating and decrease the cost and complexity of a multi-pulse rectifier, its pulse number has to be increased. In many industrial applications, a 20-pulse rectifier is suggested as the practical solution considering its simple structure and low weight. But, the 20-pulse rectifiers,...

The power synchronization control strategy for grid-connected voltage-source converters (VSCs) provides an operation similar to synchronous machines. It is able to avoid the instability caused by a standard phase-locked loop in integration into weak grids. However, the non-minimum phase phenomenon in the developed dynamics places a fundamental limi...

Nowadays, networked control systems necessitate considering faulty signals into controls from the beginning of the design process. Therefore, synthesizing control methods, which are able to deal with faulty signals and tolerate them, must be thoroughly investigated and integrated into the design process from the commencement. This paper has propose...

Nowadays, emerging microgrids have been forming fully integrated power and energy systems using multi-infeed ac/dc (MIACDC) power architectures. An MIACDC power architecture easily integrates renewables, battery energy storage systems, fossil-fuel-based generating units, and various types of loads into one coherent microgrid. Therefore, in moderniz...

This article proposes a novel mathematical approach to deal with cyberattacks (CAs) impacting on modernized microgrid's (MMG) tertiary control. MMGs use many entities based on voltage-source converters to form the fully integrated power and energy system (FIPES). Having such a power and energy system for MMGs necessitates engineers considering cybe...

In many pilot research and development (R&D) microgrid projects, engine-based generators are employed in their power systems, either generating electrical energy or being mixed with the heat and power technology. One of the critical tasks of such engine-based generation units is the frequency regulation in the islanded mode of modernized microgrid...

Grid-forming (GF) inverter technology is a novel and evolving concept for systems with high penetration of renewables. The integration of these grid-independent units with the existing conventional generators and gradually replacing them should contribute to stabilizing the power grid. Several control strategies are proposed in order to design GF i...

Nowadays, emerging modernized microgrids (MMGs) have significantly employed the voltage-source inverters (VSIs). VSIs are enabling technologies to form multiinfeed ac/dc (MIACDC) power systems integrating a variety of generation units and different loads into one coherent grid. In emerging MMGs, the frequency-dependent dynamics of multiple componen...

This paper proposes a dual two-level voltage-source inverter (DTL VSI) and its control to effectively integrate two dc sources into the multi-infeed ac/dc (MIACDC) power architecture of fully integrated power and energy systems (FIPESs). The current-controlled method is also synthesized and proposed to control the grid-connected DTL VSI. To this en...

This paper studies the non-zero-sum game output regulation problem (GORP) for a class of continuous-time multi-player linear systems. Without the knowledge of state and input matrices, the Nash equilibrium solution, N-tuple of feedback control policy, is learned through online data collected along the system trajectories. A key strategy is, for the...

Among all converters, one of the most prominent technologies employed in multi-infeed ac/dc (MIACDC) smart grids is the modular multilevel converters (MMCs). The core part of the MIACDC grids is their dc-voltage power port. All MMC's components in a dc-voltage power port – which are capable of significantly impacting on the dynamics – are mathemati...

Due to simplicity, practicality, and absence of communication needs, stabilizing the dc voltage via a dc-voltage power port voltage-sourced converter (VSC) connected to an ac grid (also known as the master VSC in some works of literature), is a favorable option in multi-infeed ac/dc modernized grids (MI-AC/DC-MGs). However, in MI-AC/DC-MGs, several...

In this paper, considering both Lyapunov stability and H∞ performance criteria, a novel event-based filtering scheme is proposed for a class of “stochastic” linear systems with noise, which significantly compromises the performance of event-triggered systems. This paper contributes to the field of research as follows. First, the scheme proposed wil...

In this paper, a near-state pulse width modulation (NSPWM) algorithm is proposed and implemented on dual two-level voltage source inverters (D2L-VSIs) in order to reduce common-mode voltage (CMV), the inverter switching losses, current total harmonic distortion (THD), and the side effects of bearing currents compared to SVM and PWM7. In order to ga...

This brief studies the cooperative output regulation problems of multi-agent systems with parametric and dynamic uncertainties. By means of robust adaptive dynamic programming, a model-free distributed controller is developed via online input and state data. The cyclic-small-gain theorem is applied to ensure the asymptotic stability of the closed-l...

Conventional vector-controlled voltage-source converters (VSC) suffer from stability and performance problems when integrated into very weak ac grids (high-impedance grids). This is attributed to the increased coupling between the converter and grid dynamics, via the phase-locked loop (PLL), at the very weak-grid condition. In the current literatur...

DC grids are gaining widespread acceptance under the smart grid paradigm. A full-scale permanent-magnet synchronous generator wind turbine can be interfaced to a dc grid by a voltage-source converter (VSC). Under weak ac grid connections or isolated operation of the dc grid, the machine-side VSC regulates the dc-link voltage via changes in the gene...

The electric energy sector is moving toward extensive integration of renewable and clean energy resources, energy storage units, and modern loads via highly efficient and flexible multi-terminal dc grids integrated within the traditional ac grid infrastructure. A voltage-source converter (VSC) is the main technology enabling the interconnection of...

DC-energy-pool-based multiterminal grids are gaining widespread acceptance under the super- and smart-grid vision. DC-link voltage control via a master voltage-source converter (VSC) is essential to ensure stable and reliable operation of the overall multiterminal system. In such a demanding application, conventional dc-link voltage controllers, ho...

Hybrid ac/dc multi-terminal micro-grids are gaining high momentum under the smart grid paradigm to integrate renewable and clean energy resources either in the transmission or distribution systems. This paper presents a robust multi-objective controller for the voltage-source-converter (VSC)-based dc-voltage power-port in hybrid ac/dc networks. The...