Search query: three phase inverter

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abstract: This paper proposes a new dc ac converter with a reduced number of semiconductor switches and gate drive and control circuit components. A salient feature of this inverter is its pure sinusoidal line to line voltages with no need for output filter. Also, the proposed inverter improves the voltage utilization factor of the input dc supply compared to the four switch three phase inverter (first best topology in the literature from the number of switches point of view) and standard six switch inverter with sine pulsewidth modulation. The proposed inverter is capable of operating with a wide range of output voltages from zero to the full value of the dc input voltage by appropriately altering the instantaneous duty cycle. A three phase universal inverter with only three power switch has been proposed in this paper for the first time ever, to our knowledge. For the purpose of providing a good compromise between fast transient response and stability, a model predictive controller is proposed. All the design expressions have been derived. A comparison with other dc ac converters is given to show the merits of the proposed converter. Finally, satisfactory circuit operation is confirmed by experimental results from a laboratory prototype.
author_names: Masoud Farhadi

Mehdi Abapour
title: Three Switch Three Phase Inverter With Improved DC Voltage Utilization
venue: IEEE Transactions on Industrial Electronics
year: 2019

abstract: This paper proposes an effective model predictive control (MPC) scheme using a modulated optimal vector (MOV) and finite control options for a three phase inverter with an LC filter. Unlike other MPC methods, the proposed MPC strategy exploits the unconstrained optimal vector (OV) of the continuous control set (CCS) MPC to limit the control options for the unconstrained mode. First, the analytical OV is derived based on a least squares optimization. If the input constraints are not violated, the OV is applied with a space vector modulation (SVM) technique like the CCS MPC. Otherwise, the OV is scaled into the MOV and only three control options are online evaluated to reselect the control input. Experiments are conducted on a three phase inverter test bed with a TI TMS320F28335 digital signal processor to validate the improvements of the proposed method, especially the robust performances and fast responses. The comparative results with the FCS MPC show the superior performances of the proposed scheme with smaller steady state error and lower total harmonic distortion due to the analytical OV with SVM, more robustness to parameter uncertainties due to the disturbance observer, and faster dynamic response due to the online reselection of control inputs.
author_names: Hoach the Nguyen

Eun-Kyung Kim

Ik-Pyo Kim

Han Ho Choi

Jin-Woo Jung
title: Model Predictive Control with Modulated Optimal Vector for a Three Phase Inverter with an LC Filter
venue: IEEE Transactions on Power Electronics
year: 2018

abstract: Adding the auxiliary switches to the conventional H bridge inverter is an effective way to eliminate the leakage current for transformerless PV systems, such as H5, H6, etc. Inspired by the newly developed embedded switch H6 topology, a novel embedded switch inverter (ESI) is proposed in this paper for three phase transformerless PV systems. First, the operation principle and characteristics of the proposed ESI are analyzed. Second, the common mode model of the three phase ESI is established, based on which the main factors that affect the leakage current are discussed. The finding reveals that the switching states with conventional modulation strategy result in high frequency common mode voltage, which is the source of leakage current. In order to solve the problem, a new modulation strategy is presented for ESI to eliminate the high frequency leakage current. Finally, the time domain simulation and the experimental tests are carried out. The results verify the effectiveness of the proposed solution.
author_names: Xiaoqiang Guo

Yong Yang

Tieying Zhu
title: ESI: A Novel Three Phase Inverter With Leakage Current Attenuation for Transformerless PV Systems
venue: IEEE Transactions on Industrial Electronics
year: 2018

abstract: This letter presents a three phase voltage source inverter (VSI) topology to reduce the common mode (CM) voltage and electromagnetic interference (EMI) of electric motor drives. Instead of using filters, active or passive, or specific pulse width modulated (PWM) techniques to reduce the CM voltage, the proposed topology has inherently less CM voltage generation. With the addition of two switches placed in series on the dc lines, this topology effectively reduces the CM voltage during zero switching states by "floating" the inverter from the dc source. This topology can be implemented with any PWM method and does not add any additional complexity to the standard control techniques. The operation and CM reduction capability of the topology is first demonstrated in simulation and then verified with experimental results. A comparison of both common mode voltage and EMI is made to a conventional three phase VSI to demonstrate the effectiveness of the proposed topology.
author_names: Casey T Morris

Di Han

Bulent Sarlioglu
title: Reduction of Common Mode Voltage and Conducted EMI Through Three Phase Inverter Topology
venue: IEEE Transactions on Power Electronics
year: 2017

abstract: When control schemes based on finite control set model predictive control are experimentally implemented, a large amount of calculations is required, introducing a considerable time delay in the actuation. This delay can deteriorate the performance of the system if not considered in the design of the controller. In this paper, the problem is described, and the solution to this issue is clearly explained using a three phase inverter as an example. Experimental results to validate this solution are shown.
author_names: Patricio Cortes

Jose R Rodriguez

Cesar Bastos da Silva

Alexis Flores
title: Delay Compensation in Model Predictive Current Control of a Three Phase Inverter
venue: IEEE Transactions on Industrial Electronics
year: 2012

abstract: High dc voltage utilization is one of the important requirements in a three phase inverter. Under some carrier based pulse width modulations (PWMs) the dc voltage utilization can reach the same maximum as that under the space vector modulation. But the third harmonic component of common mode voltage (CMV) will be increased markedly while using these carrier based PWMs in inverters. To improve the situation, this paper proposes that a midpoint fluctuation carrier (MFC) scheme should be used in the three phase inverter. The MFC is formed by adding a midpoint fluctuation signal on the standard symmetrical triangular carrier. By analyzing the linear modulation region of the midpoint fluctuation signals, a minimum fluctuant signal in the linear modulation region is designed in the paper. Compared with the use of other conventional schemes in the three phase inverter, the use of minimum MFC scheme has higher fundamental amplitude in the output line voltage and smaller magnitude of the third harmonic in the CMV. The feasibility and validity of the MFC are proved by experiment results in a three phase inverter.
author_names: Jin Huang

Quanhui Liu

Xulong Wang

Kaicheng Li
title: A Carrier Based Modulation Scheme to Reduce the Third Harmonic Component of Common Mode Voltage in a Three Phase Inverter Under High DC Voltage Utilization
venue: IEEE Transactions on Industrial Electronics
year: 2018

abstract: It is well known that predictive control methods can be affected by the presence of modeling errors. The extent to which finite control set model predictive control (FCS MPC) is influenced by parametric uncertainties is a recurrent concern at the moment of evaluating the viability of this method for power electronics applications. This paper proposes an analytic approach to examine the influence of model parametric uncertainties on the prediction error of FCS MPC for current control in a three phase two level inverter. The analysis shows that the prediction error is not only determined by parametric mismatch but also by the instantaneous values of load current and inverter output voltage. This implies that within each sampling period of the predictive algorithm several conditions of prediction error are generated, as multiple voltage vectors are evaluated. Simulation and experimental results are provided and discussed showing the effects of inaccuracies in the modeling of load resistance and inductance parameters on the performance of FCS MPC. Even though steady state performance is noticeably affected with parameter changes, especially when the load inductance is overestimated by the model, its fast transient step response is less affected by parameter changes.
author_names: Hector A Young

Marcelo A Perez

Jose R Rodriguez
title: Analysis of Finite Control Set Model Predictive Current Control With Model Parameter Mismatch in a Three Phase Inverter
venue: IEEE Transactions on Industrial Electronics
year: 2016

abstract: Small signal stability is an important concern in three phase inverter based ac power systems. The impedance based approach based on the generalized Nyquist stability criterion (GNC) can analyze the stability related with the medium and high frequency modes of the systems. However, the GNC involves the right half plane (RHP) pole calculation of return ratio transfer function matrices, which cannot be avoided for stability analysis of complicated ac power systems. Therefore, it necessitates the detailed internal control information of the inverters, which is not normally available for commercial inverters. To address this issue, this paper introduces the component connection method (CCM) in the frequency domain for stability analysis in the synchronous d q frame, by proposing a method of deriving the impedance matrix of the connection networks of inverter based ac power systems. Demonstration on a two area system and a microgrid shows that: The CCM enabled approach can avoid the RHP pole calculation of return ratio matrices and enables the stability analysis by using only the impedances of system components, which could be measured without the need for the internal information. A stability analysis method based on d q impedances, the CCM, and the determinant based GNC is also proposed to further simplify the analysis process. Inverter controller parameters can be designed as stability regions in parameter spaces, by repetitively applying the proposed stability analysis method. Simulation and experimental results verify the validity of the proposed stability analysis method and the parameter design approach.
author_names: Wenchao Cao

Yiwei Ma

Liu Yang

Fei Wang

Leon M Tolbert
title: D Q Impedance Based Stability Analysis and Parameter Design of Three Phase Inverter Based AC Power Systems
venue: IEEE Transactions on Industrial Electronics
year: 2017

abstract: This paper presents a speed controller using a fuzzy logic controller (FLC) for indirect field oriented control (IFOC) of induction motor (IM) drives fed by a four switch three phase (FSTP) inverter. In the proposed approach, the IM drive system is fed by an FSTP inverter instead of the traditional six switch three phase (SSTP) inverter for cost effective low power applications. The proposed FLC improves dynamic responses, and it is also designed with reduced computation burden. The complete IFOC scheme incorporating the FLC for IM drives fed by the proposed FSTP inverter is built in MATLAB/Simulink, and it is also experimentally implemented in real time using a DSP DS1103 control board for a prototype 1.1 kW IM. The dynamic performance, robustness, and insensitivity of the proposed FLC with the FSTP inverter fed IM drive is examined and compared to a traditional proportional integral (PI) controller under speed tracking, load disturbances, and parameters variation, particularly at low speeds. It is found that the proposed FLC is more robust than the PI controller under load disturbances, and parameters variation. Moreover, the proposed FSTP IM drive is comparable with a traditional SSTP IM drive, considering its good dynamic performance, cost reduction, and low total harmonic distortion (THD)
author_names: Mohamed S Zaky

Mohamed K Metwaly
title: A Performance Investigation of a Four Switch Three Phase Inverter Fed IM Drives at Low Speeds Using Fuzzy Logic and PI Controllers
venue: IEEE Transactions on Power Electronics
year: 2017

abstract: Three phase inverter based multibus ac power systems could suffer from the harmonic instability issue. The existing impedance based stability analysis method using the Nyquist stability criterion once requires the calculation of right half plane (RHP) poles of impedance ratios, which would result in a heavy computation burden for complicated systems. In order to analyze the harmonic stability of multibus ac systems consisting of both voltage controlled and current controlled inverters without the need for RHP pole calculation, this paper proposes two sequence impedance based harmonic stability analysis methods. Based on the summary of all major connection types including mesh, the proposed Method 1 can analyze the harmonic stability of multibus ac systems by adding the components one by one from nodes in the lowest level to areas in the highest system level, and accordingly, applying the stability criteria multiple times in succession. The proposed Method 2 is a generalized extension of the impedance sum type criterion to be used for the harmonic stability analysis of any multibus ac systems based on Cauchy's theorem. The inverter controller parameters can be designed in the forms of stability regions in the parameter space, by repetitively applying the proposed harmonic stability analysis methods. Experimental results of inverter based multibus ac systems validate the effectiveness of the proposed harmonic stability analysis methods and parameter design approach.
author_names: Wenchao Cao

Yiwei Ma

Fred Wang
title: Sequence Impedance Based Harmonic Stability Analysis and Controller Parameter Design of Three Phase Inverter Based Multibus AC Power Systems
venue: IEEE Transactions on Power Electronics
year: 2017