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In this paper, a wireless power transmission with foreign-object detection (FOD) consideration is proposed. In the foreign-object detecting technique, a closed-loop feedback control is proposed by tracking the voltage and current of transmitting coil in order to signal the occurrence of a significant phase difference, anticipating preventing the system from potential risks. To validate the effectiveness...
A method for generating reactive power in photovoltaic (PV) inverters is presented. This method is based on the extraction of active and reactive components present in the output current of a PV-Inverter using a scheme consisted of low pass filter. The extraction results, together with the unity sinusoidal signal obtained from the phase lockup loop is used to generate a reference for current controller...
This paper investigates the effects of unintended island operation mode on parallel inverters' performance for microgrid applications. In the grid-connected mode, each inverter has a different power set point. The power flows between the inverters and the grid. In the islanding mode, the power flows inherently from the inverter that has higher set point power to the inverter has lower one leading...
Chaotic nature of renewable energy sources connected with nonlinear loads may cause serious problems to the utility grid, e.g. voltage and frequency disturbances, harmonic pollution. Due to that, many European governments have set strict regulations to the grid energy injection. As a result, the power quality has become one of the major obstacles for nearly zero energy buildings to be connected with...
A large electrolytic capacitor is always used to provide stable DC-link voltage in single-phase to three-phase power converter. However, the large electrolytic capacitor occupies a large volume and has a short lifetime as to the home appliances. And additional PFC circuit is needed to correct the grid current. In order to settle these issues, an electrolytic capacitor-less converter system is studied...
In single-phase photovoltaic (PV) systems, power mismatching between input and output terminal leads to power pulsation, seriously affecting maximum power point tracking (MPPT). Paralleling an electrolytic capacitor (e-cap) across PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifetime. Various power decoupling methods used in micro-inverters have been proposed...
In this paper, a virtual synchronous generator with photovoltaic energy storage hybrid system (VSG-PV) is adopted. VSG-PV can not only output the maximum power of photovoltaic, but also can maintain a stable voltage and frequency of the point of common coupling when system worked in the island model comparing to the conventional photovoltaic generation system. The small signal model of the hybrid...
In this paper, an improved grid voltage modulated control (GVM) with power compensation is proposed for grid-connected voltage inverters when the grid voltage is unbalanced. The objective of the proposed control is to remove the power ripple and to improve current quality. Three power compensation objectives are selected to eliminate the negative sequence components of currents. The modified GVM method...
Fault current limiters (FCLs) are one class of solutions to cope with the upcoming challenges in microgrid protection. Considering high penetration of distributed generations (DGs) in microgrids, the necessity of designing cheap and effective FCL is getting higher. This paper attempts to fill this gap by proposing an embedded FCL operating based on modifying the secondary control of DGs. As this method...
The grid-connected inverter with a LCL filter has the ability of attenuating the high-frequency current harmonics. The current distortion caused by harmonics in the grid voltage is difficult to be eliminated. Applying proportion feedforward of the grid voltage can suppress the effect of grid voltage harmonics. However, weak grid is commonly seemed as a voltage source which contains a grid impedance...
A predictive control scheme for the third-harmonic injection two-stage matrix converter (3TSMC) under unbalanced input voltages is presented. The proposed scheme is designed to predict the future behavior of the third-harmonic injection current and load currents respectively for each valid switching state. The control scheme selects the state that minimizes the error between the predicted currents...
In this paper a current-limiting droop control of grid-tied inverters that introduces virtual inertia and operates without a phase locked loop unit is proposed. The proposed controller inherits a self-synchronization function and can guarantee tight bounds for the inverter frequency. In addition, using nonlinear Lyapunov theory, it is analytically proven that the inverter current never violates a...
This paper proposes energy management in smart home with solar renewable energy using smart plug and inverter. Through the smart plug, information on all loads in the home is monitored and collected to an energy management center. Load profiles are managed, and the loads are classified dynamically based on the profiles in the center. When a power failure occurs, the multimode solar inverter supplies...
The paper presents the natural extension DTC principle of three level diode clamped voltage inverter fed induction motor. This technique is based on a simple algorithm using look-up table for a three-level inverter established from a standard two-level inverter. The control algorithm is implemented using Field Programmable Gate Arrays (FPGA) with VHDL coding.
This paper presents five-level series active power filter based on modified instantaneous reactive power theory control strategies. The standard configuration uses voltage source inverter with hysteresis controller, this configuration presents several drawbacks such us uneven switching frequency. Multilevel inverters are currently being investigated and used in various industrial applications. Five-level...
In order to offer a good power quality for end users in islanded microgrids, the power sharing between distributed generators (DGs) is the first challenge that must be ensured. In this paper, a droop control method based primary control for two parallel single-phase VSIs forming an islanded microgrid is presented. The proposed control consists of two DGs local controllers, where each controller includes...
A well-known problem of three-level neutral point clamped (NPC) inverter is the voltage imbalance in the dc-link capacitors. This paper proposes the dc-link capacitor voltage balancing method where a common offset voltage is injected. The offset voltage consists of a harmonic voltage and a magnitude difference between the upper and the lower capacitors. Theoretical analysis is provided to balance...
Open-end winding induction motor can be powered by double inverters at both ends. Comparing with conventional single-ended inverter induction motor drive, this new configuration produces some advantages, such as high error tolerance capability, high flexibility, and low DC voltage rating, and so on. Under single DC power supply however, the zero-sequence currents may be produced by the common mode...
This paper presents a thorough study on Five-Level Packed U-Cell inverter called PUC5. The main advantage of PUC5 topology over other popular multilevel ones is the redundant switching states, which facilitate the voltage balancing of the flying capacitor in its configuration. Switching states of the PUC5 inverter are analyzed to ensure an easy voltage balancing process. That voltage controlled auxiliary...
This paper provides a novel voltage space vector modulation algorithm dedicated to the inverter fault-tolerant motor drive systems based on the four-switch inverter topology. The proposed technique ensures an accurate phase voltage modulation even under a DC-link voltage imbalance. Moreover, the capacitor voltages of the DC-link are leveled up so that the simultaneous motor drive operation is obtained...
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