Performance Analysis of T-type Inverter Based on Improved Hysteresis Current Controller
30 Apr 2019-Vol. 7, Iss: 2, pp 149-155
TL;DR: In this article, an improved hysteresis current control method for five level T-type inverter is presented, which is based on an error signal between the output current and the reference value.
Abstract: This paper presents an improved hysteresis current control method for five level T-type inverter. The proposed method is based on four hysteresis levels and performed to generate switching signals of fundamental transistors in T-type inverter. By using generated signals through hysteresis controller, bidirectional switch in T-type inverter is triggered through the logical way. The system is detailed in analytical expression and exhibited to generate five voltage levels at the output of inverter. The improved technique is based on an error signal between the output current and the reference value. Therefore, the proposed modulation technique achieves the following output current at the desired value and ensures high-efficiency conversion ratio at the output. In order to show the validity of the proposed method, the controller is compared with conventional sinusoidal pulse width modulated T-type inverter. In performance results, it is obvious that the proposed method provides a lower total harmonic distortion in comparison with conventional method.
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References
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TL;DR: A three-phase cascaded multilevel inverter that uses five-level transistor-clamped H-bridge power cells that provides higher output quality with relatively lower power loss as compared to the other conventional inverters with the same output quality.
Abstract: This paper presents a three-phase cascaded multilevel inverter that uses five-level transistor-clamped H-bridge power cells. Multicarrier phase-shifted pulse-width modulation method is used to achieve balanced power distribution among the power cells. A new method to balance the midpoint capacitor voltage in each cell is developed and tested. The analysis of the output voltage harmonics and the total power losses covering the conduction and the switching power losses are carried out and compared with the cascaded neutral-point-clamped and the conventional cascaded H-bridge inverters. For verifications, the proposed inverter is experimentally tested on an induction motor. From the results, the proposed inverter provides higher output quality with relatively lower power loss as compared to the other conventional inverters with the same output quality.
179 citations
"Performance Analysis of T-type Inve..." refers background in this paper
...In the operation of the inverter, S1-S4 and S2-S3 are turned on to generate Vdc and –Vdc levels, respectively [24]....
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08 Oct 1995
TL;DR: A simple, self adjusting analog prediction of the hysteresis band is added to the phase-locked-loop control to ensure constant switching frequency even at high rate of output voltage change, such as required in active filters, fast drives and in other high demanding applications.
Abstract: An improved implementation of the constant-frequency hysteresis current control of three-phase voltage-source inverters is presented A simple, self-adjusting analog prediction of the hysteresis band is added to the phase-locked-loop control to ensure constant switching frequency, even at a high rate of output voltage change, such as required in active filters, fast drives and other highly demanding applications This provision also improves the relative position of phase modulation pulses, thus reducing the current ripple The prediction method is robust and uses a small number of inexpensive components It does not require trimming or tuning, giving the whole system the capability to adjust itself to different load conditions Thus, the control becomes suitable for hybrid or monolithic integration In this paper, the basic principles are described, and a detailed stability analysis is carried out The control performance is illustrated, both by simulated and experimental results
141 citations
TL;DR: Numerical and experimental results show that the proposed 5L-T-AHB inverter achieves high efficiency, exhibits reduced leakage currents, and complies with the transformerless norms and regulations, which makes it suitable for the transformer less PV inverters market.
Abstract: This paper presents a transformerless single-phase inverter topology based on a modified H-bridge-based multilevel converter. The topology comprises two legs, namely, a usual two-level leg and a T-type leg. The latter is based on a usual two-level leg, which has been modified to gain access to the midpoint of the split dc-link by means of a bidirectional switch. The topology is referred as an asymmetrical T-type five-level (5L-T-AHB) inverter. An ad hoc modulation strategy based on sinusoidal pulsewidth modulation is also presented to control the 5L-T-AHB inverter, where the two-level leg is commuted at fundamental frequency. Numerical and experimental results show that the proposed 5L-T-AHB inverter achieves high efficiency, exhibits reduced leakage currents, and complies with the transformerless norms and regulations, which makes it suitable for the transformerless PV inverters market. 1 1 This updated version includes experimental evidence, considerations for practical implementation, efficiency studies, visualization of semiconductor losses distribution, a deeper and corrected common mode analysis, and an improved notation among other modifications.
115 citations
"Performance Analysis of T-type Inve..." refers background in this paper
...In the third stage, bidirectional switch S5 and S3 are turned on to generate negative half dc voltage at load [25]....
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TL;DR: A hybrid-clamped multilevel-inverter topology comprising active and passive clamping devices is presented, which can be used in real and reactive power conversion applications and is confirmed by simulations and experiments based on a five-level inverter.
Abstract: The concept of hybrid clamped is proposed in multilevel-inverter topologies, and a hybrid-clamped multilevel-inverter topology comprising active and passive clamping devices is presented in this paper. In this topology, the dc-link capacitor voltages can be balanced without additional circuitry or separated dc voltage sources, regardless of load characteristics. It can be used in real and reactive power conversion applications. The topology structure, operating principle, and self-voltage balancing ability are analyzed. In addition, the validity is confirmed by simulations and experiments based on a five-level inverter. Finally, the functions of different clamping devices are compared
113 citations
"Performance Analysis of T-type Inve..." refers background in this paper
...The most common multilevel inverter topologies are cascaded H-bridge, diode clamped and flying capacitors [16, 17]....
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TL;DR: To determine an optimum modulation for controlling the parallel connected NPC-PWM inverter, various modulation techniques are devised and discussed, whose results are verified by experiment.
Abstract: The neutral point clamped (NPC)-PWM inverters have been put into practical use for large capacity AC motor drives, because of their many advantages. With the increase in use, still larger capacity inverters are also expected. In this paper, a parallel connected NPC-PWM inverter is applied for AC motor drive. The conventional modulation techniques are extended to improve the inverter characteristics. To determine an optimum modulation for controlling the parallel connected NPC-PWM inverter, various modulation techniques are devised and discussed, whose results are verified by experiment.
92 citations
"Performance Analysis of T-type Inve..." refers background in this paper
...These converters exist in different implementations such as renewable energy integration, custom power devices, industrial and home appliances in different power ranges [1, 2]....
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