 When utilized at low amplitude modulation indices, existing multilevel carrier-based PWM strategies have no special provisions for this operating region, and several levels of the inverter go unused. This paper proposes some novel multilevel PWM strategies to take advantage of the multiple levels in both a diode-clamped inverter and a cascaded Hbridges inverter by utilizing all of the levels ...

Standard lowand medium-power induction motor drives are based on the pulsewidth modulation (PWM) voltagesource inverter fed from a diode rectifier. The dual topology, based on the current-source inverter/rectifier structure is used in mediumand high-power applications. This paper analyzes the existing motor drives based on current-source topologies and proposes a control strategy that addresses...

In islanded ac microgrids, the mismatched impedances of interfacing feeders between inverters and load bus cause poor reactive power sharing when conventional frequency voltage droop control technique is employed. Such operation endangers whole microgrid reliability as it may lead to overloading certain and, consequently, triggering protection relays causing cascaded failure. Thus, this article...

Over the past decade, world’s electrical grid infrastructure has experienced rapid growth in integration of grid-edge inverter-based distributed energy resources (DERs). This led to operating concerns associated with reduced system inertia, stability and intermittent renewable power generation. However, advanced or “smart” inverters can provide services such as volt-VAR, frequency-Watt, constan...

Second-order ripples occur in the voltage and current during any DC–AC power conversion. These conversions source inverters (VSIs), (CSIs), various single-stage (SSIs) topologies. The second-order lead to oscillating node currents DC bus voltages when there is an interconnection between AC microgrids or load connected of microgrid. have detrimental effects on sources battery storage. In storage...

In this paper, a control strategy of voltage source inverter with LCL filter in distributed electrical energy systems both operation modes is proposed for microgrids environment. This robust considers state feedback controller based on proportional resonant using linear matrix inequalities. The able to ensure good tracking sinusoidal references and suppress low order harmonics. It allows simult...

Microgrids have become a hot topic driven by the dual pressures of environmental protection concerns and the energy crisis. In this paper, a challenge for the distributed control of a modern electric grid incorporating clusters of residential microgrids is elaborated and a hierarchical multi-agent system (MAS) is proposed as a solution. The issues of how to realize the hierarchical MAS and how ...

An inverter-based microgrid is a small-scale power network governed by distributed control system. In this system, the nodes are digital controllers of inverters, normally located at separate points within microgrid. A relevant issue that these operate different frequencies due to inherent clock deviations in local hardware oscillators. This paper evaluates effects on performance microgrids equ...

In this paper, a series Z-source inverter based on switched inductors cell is proposed for the first time. This inverter is able to increase the voltage gain in comparison to the conventional Z–source inverters in additon to solve the ST (shoot-through) state’s problems. In this inverter, the value of voltage gain is increased by increasing the number of used diodes and inductors in the switche...