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This paper presents an interfacing system of a photovoltaic (PV) array with an electrical grid based on a dual cascaded inverter. The PV array is connected to the main inverter through a boost converter, for maximum power extraction, while the dc-side of the auxiliary inverter is connected to a capacitor bank. The main and auxiliary inverters are controlled to deliver the harvested maximum power from...
The paper proposes a three phase nine level T-type neutral point clamped (9L-T-NPC) inverter for medium voltage induction motor drive. The primary objective of the proposed inverter is to improve the output voltage quality with reduced number of devices and passive components. The generation of nine levels in the output pole voltage is achieved using only ten switches per phase. Although the similar...
Apart from high power density, unified power quality conditioner (UPQC) offers a cost-effective and energy-efficient way to deal with power quality issues. A single-phase transformer-less unified power quality conditioner (TL-UPQC) utilizing four switching devices only is presented. The proposed UPQC consists of two voltage source inverters, one is connected in parallel with the load and another one...
In Digital Grid which has been proposed as a new electric power grid, multi-inverters are operated in parallel and it may cause the cross-current among those inverters, since inverters do not have synchronizing mechanism. In this study, the authors propose a method to control the cross-current caused by the difference in switching frequencies of multi-inverters in parallel operation. An indirect hysteresis...
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 proposes an improved control strategy for switching frequency variation in hysteresis current controlled Voltage Source Inverter (VSI) fed induction motor (IM) drives. The advantages of simple hysteresis controller like simple implementation and fast dynamic response along with nearly constant switching frequency and reduction in current ripple are obtained in the proposed controller. Elimination...
One of the most popular and easy to implement control strategy for the inverter in induction motor drive system is the hysteresis current control. The most drawbacks associated with the conventional hysteresis current controller is the variable switching frequency due to the constant hysteresis band. This paper aims to develop variable hysteresis band with fuzzy logic controller which can produce...
This paper presents work on the hysteresis band control for output current regulation in a direct matrix converter in order to drive an induction motor. The hysteresis band controller offers excellent dynamic performance. It has been extensively researched for the voltage source inverter and inverter based drive systems, but it has not been investigated within the context of a matrix converter or...
This paper presents a new structure based on a line-commutated inverter (LCI) for photovoltaic (PV) applications. The proposed LCI circuit is able to inject the DC power to the grid at the unity power factor and with reduced harmonic levels. The proposed circuit with voltage-based maximum power point tracking (MPPT) is implemented in grid-connected PV system. The experimental results show that proposed...
In this study, the authors aim to develop the interconnection inverter called “Proton” used for the “Digital Grid” which has been proposed as a new electric power grid. The authors propose an islanding detection function and fault ride thorough (FRT) function of interconnection inverter. In the proposed method, the output current is controlled to be proportional to the voltage of the grid. During...
Dual buck half bridge inverter(DBHBI) has a benefit of no shoot-through issue, however, severe waveform distortion is badly undesirable. Hysteresis control is commonly used to improve output quality, which has fast dynamic response and easy to approach. Since the switching frequency in the hysteresis control is unfixed, voltage loss and harmonic frequency issues are inevitable. The paper proposes...
This paper presents the design and implementation of a high speed sensorless brushless DC motor (BLDCM) drive with commutation compensation. The back electromotive force (EMF) detection using three phase terminal voltage is implemented to detect the rotor position, in order to filter the high frequency switching signals, a low pass filter is applied in the back EMF detection circuits, the cut-off...
The electrostatic precipitator (ESP) system depends heavily on the three-phase IGBT intelligent inverter high voltage (HV) power supply. To improve the dynamic responses of ESPs during the event of flashovers and back corona, a magnificent nonlinear-controll technology called hysteretic current-mode control (HCMC) concept is proposed based on the working characteristics of ESPs. This method adapts...
Induction motor speed control was relatively difficult, because the generated torque and flux are related or not free. In addition to adjusting the speed, it required inverter control. The inverter output was not a pure sinusoidal signal but it is the result of the switching. Therefore, it was necessary to be able to fix the method of switching the inverter output signal that can adjust induction...
The aim of this research work is to evaluate and compare the performances of the Direct Torque Control (DTC) and Predictive Torque Control (PTC) algorithms both applied to a three phase induction motor drive fed by three level reduced switch VSI. The comparison has been made based on the torque and current ripples, settling time, and response times during speed and load disturbances and Total Harmonic...
Variable carrier single rate deadbeat control method for low carrier frequency was proposed. In the large capacity inverter system, the carrier frequency range is limited to relatively lower frequency range, the trade off between the control accuracy and the efficiency should be considered. Digital hysteresis control was applied to the inductor current, suitable carrier frequency was adopted in every...
This paper presents a real-time emulator for single-phase half-bridge inverter operated in stand-alone mode. The discrete-time model used to emulate the inverter is derived by discretizing the three characteristic differential equation of the inverter. The emulator is implemented on high-speed FPGA (Field Programmable Gate Array), which enable FPGA based digital controller be evaluated by a real-time...
Progress in efficiency improvement has been main a matter in grid tie inverters. The employment of multilevel inverters in energy conversion promises a better power quality and lower switching losses than ordinary two-level inverters even in low voltage grid. This paper presents the implementation of several control schemes (Vector Oriented Control, Hysteresis Control) and modulation techniques (Pulse-width...
This paper presents a brief overview of Schmitt Triggers and proposes a low voltage adjustable CMOS Schmitt trigger using body biasing technique. The voltage-feedback inverter with body control is employed to speed up the switching process, and control the intensity of the feedback. The proposed Schmitt trigger makes it particularly attractive for low-voltage high-speed applications. The CMOS Schmitt...
In a power system, the continuous power supply, for critical load. The continuous power supply is essential for applications like for communication network, financial transaction and medical therapies. So there is a need of back-up supply to load. Considering these needs of continuous power supply, a scheme is implemented with inverter and battery energy storage system (BESS) along with renewable...
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