Search query: Single phase inverter

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abstract: This article presents a novel switched capacitor (SC) based (2n 1) level single phase inverter with a reduced number of components and input dc voltage supply. This inverter is designed in a way that just one dc source is required to generate different voltage levels. The circuit consists of three major parts, i.e. front end boost stage, active SC cell(s) in the middle, and H bridge inverter at the end. The total number of output voltage levels is up to (2n 1) levels, where n 2 is the number of switching cells, which consists of three active switches and two capacitors. Compared with conventional SC based multilevel inverter topologies, the proposed topology features many advantages, such as low number of semiconductor devices, quasi resonant charging of capacitors that reduce the inrush current and current stress on the devices, self balancing of capacitor, and reduced voltage stress on the switches. Moreover, a simple sinusoidal pulsewidth modulation technique is employed here to generate the modulation signals for the proposed inverter. The operating principle is presented in detail followed by comparative analysis, thermal modeling, and design guidelines. Finally, computer simulation and laboratory test results are carried out for a five level inverter with one SC cells as well as a seven level inverter with two SC cells as two examples to verify the performance of the proposed (2n 1) level inverter. Measurement results show that the proposed inverter has the 96.5 1% efficiency over a wide range of load with a peak efficiency of 98.56%
author_names: Mojtaba Forouzesh

Yam Prasad Siwakoti

Liwei Li

Frede Blaabjerg
title: Switched Capacitor Integrated (2n 1) Level Step Up Single Phase Inverter
venue: IEEE Transactions on Power Electronics
year: 2020

abstract: This paper deals with the simulation and design of 1kw, 230 volt 50 Hz inverter. The elementary purpose of this device is to transmute 12V DC to 230V AC. We design a low cost inverter circuit using MOSFET motivated by an growing demand due to frequent power shortage. The system is design with microcontroller (ATMEGA 328) for control circuit. A 5 volts regulator (IC 7805) is used to supply fix 5V for biasing the switching and amplifying circuitry. Pure sine wave inverter are demand of modern era whenever it comes to utilization of DC power sources for both low and high power application. These inverters not only increase the efficiency of power system but also prevent the electrical component from damaging. In recent time research has been carried out on producing cost effective and efficient pure sine wave inverter. And the design of the paper proposes highly useful for low power based application. MATLAB/SIMULINK software is use for simulation verification of proposed circuit of inverter. The main advantage of this inverter is providing backup upto 1kw load.
author_names: Ritesh C Ujawane

Parag G Shewane

Nitin P Choudhary

Smitesh Bobde

Rahul R Jichakar
title: Simulation of Single Phase Inverter
year: 2020

abstract: This paper proposes a single phase inverter to achieve high power factor, wide input voltage range, and ripple power decoupling without using large passive components. The proposed inverter is obtained by rearranging the positions of the switches and passive components in the exiting circuit. Given that, a wider dc input voltage range can be obtained since it is no longer bounded by half the grid peak voltage. In addition, the inherent low frequency ripple power is buffered, rather than through increasing the capacitance, by swinging the decoupling capacitor voltage resulting in an improvement of the power density and system lifetime. Furthermore, with adopting a closed loop control method, no dedicated power buffering controller is required. This paper starts with introducing the derivation of the proposed inverter followed by the operation principles and circuit analysis. A comparison between the derived circuit and the original one is carried out to show the pros and cons. Finally, a 200 W prototype is constructed to demonstrate the effectiveness of the proposed topology.
author_names: Yonglu Liu

Mei Su

Fulin Liu

Minghui Zheng

Xiao Liang

Guo Xu

Yao Sun
title: Single Phase Inverter With Wide Input Voltage and Power Decoupling Capability
venue: IEEE Access
year: 2019

abstract: This paper presents the tradeoff study of heat sink and output filter volume of a GaN HEMT based single phase inverter. The selected topology is three level active neutral point clamped (ANPC) inverter, and the main aim is to explore the benefits of the GaN HEMTs at 600 V blocking class on the system level efficiency, and power density under the wide range of operating conditions. The paper starts by introducing the inverter topology, selected pulse width modulation scheme and followed by the device features, static, and dynamic characterization and continues with presenting and discussing the results of extensive experimental and analytical characterization. After this, the impact of GaN HEMTs on inverter volume is discussed in terms of heat sink and output filter volume analysis under different switching frequency and heat sink temperature conditions. The calculation of heat sink volume and single stage LC output filter volume are presented with respect to experimental results of the single phase prototype. The findings from static, dynamic characterization, and single phase prototype results clearly show that GaN HEMT has excellent switching performance under wide load current and heat sink temperature conditions. The high performance of the inverter leads to reduction of the combined total volume, including output filter and heat sink volume.
author_names: Emre Gurpinar

Alberto Castellazzi
title: Tradeoff Study of Heat Sink and Output Filter Volume in a GaN HEMT Based Single Phase Inverter
venue: IEEE Transactions on Power Electronics
year: 2018

abstract: Active ripple decoupling technique of the single phase inverter is a popular topic to minimize the dc link capacitance. However, the existing control methods are based on tracking sinusoidal or predetermined voltage waveforms of the compensation capacitor, assuming the inverter outputs are pure sinusoidal voltage and current. Therefore, the performance of existing methods degrades when the inverter output voltage and current are not purely sinusoidal. Furthermore, the limited dynamic performance threatens the safety of dc link capacitor when the load changes. This happens, because the inrush ripple power is injected into dc link with small capacitance and the dc link voltage will suddenly rise up when the ripple power is not buffered during transients. In this paper, a direct instantaneous power predictive control is proposed for the decoupling circuit to buffer ripple power of the single phase inverter, which combines instantaneous ripple power control with model predictive control to overcome the issues above. The proposed method tracks the instantaneous ripple power rather than voltage or current waveforms. In this way, it can fully buffer all ripple powers in the system even for distorted output voltage and current of the inverter and enables the full utilization of storage capacitor. In addition, model predictive control makes the proposed method have fast dynamic and perfectly compensate ripple power during transients and steady states. The buck type active ripple decoupling circuit is chosen to implement the proposed method after comparing with another typical decoupling topology. The proposed method is also compared with conventional method using proportional integral resonant regulator to track the predetermined capacitor voltage waveform. Experimental tests verify the theoretical analysis and the proposed control method.
author_names: Baoming Ge

Xiao Li

Haiyu Zhang

Yushan Liu

Robert S Balog

Haitham Abu-Rub

Lance Alpuerto
title: Direct Instantaneous Ripple Power Predictive Control for Active Ripple Decoupling of Single Phase Inverter
venue: IEEE Transactions on Industrial Electronics
year: 2018

abstract: When an existing photovoltaic (PV) system is upgraded to a residential PV/battery system, the single phase PV inverter under both input conditions of battery and PV should be properly controlled to restrain the input current ripple and grid current harmonics. To do this, equivalent circuits of PV array and Li ion battery pack are first constructed and respectively analyzed. The analysis results show that the input current under the battery pack may contain serious ripple component due to the low internal impedance of the battery pack, which cannot suppress the ripple current caused by the inherent power coupling problem of the grid connected single phase inverter. Then, based on the small signal model of the boost dc dc convertor, a novel active control method is proposed for mitigating the input current ripple, which adopts double channel current feedbacks including an additional ripple current feedback channel and the normal one. To provide the feedback signal, a third order general integrator is introduced to extract the current ripple. Besides, a proportional resonant controller is used to restrain the grid current harmonics. Finally, the control parameters are obtained using MATLAB toolbox, and the proposed control strategies are validated by the experimental results on a 5 kW prototype.
author_names: Bin Liu

Lina Wang

Dongran Song

Mei Su

Jian Yang

Deqiang He

Zhiwen Chen

Shaojian Song
title: Input Current Ripple and Grid Current Harmonics Restraint Approach for Single Phase Inverter Under Battery Input Condition in Residential Photovoltaic/Battery Systems
venue: IEEE Transactions on Sustainable Energy
year: 2018

abstract: This paper introduces a new bidirectional single phase inverter topology. The proposed topology has three ports: a dc port, an ac port, and a ripple port. The ac and dc ports are bidirectional to support rectifier or inverter operation. A small inductor, which is of alternating current, exchanges power between different ports of the single phase system. The proposed topology is capable of accomplishing voltage step up or step down, suppressing the ripple power, and performing inversion or rectification operation in one stage of power conversion. The proposed configuration offers an active decoupling function, which not only eliminates the double frequency ripple power at the dc port but also achieves minimum capacitance requirements to minimize the size of the decoupling capacitor. This facilitates the use of a very small thin film capacitor, which offers a much longer life cycle and higher reliability compared with a bulky electrolytic capacitor. A control approach is also developed to regulate the dc port and ac port currents and manage the ripple power through proper distribution of power between each port. Moreover, a very small capacitor can be placed in parallel with the inductor to reinforce the proposed configuration with soft switching operation, which enhances the overall efficiency and minimizes the voltage stress over the semiconductor devices. This converter is capable of accommodating an arbitrary number of dc or single phase ac sources and/or loads configuring a multiple input multiple output inverter without introducing any additional passive elements or sacrificing the performance of the inverter. The primary focus of this paper is dc to ac conversion mode of operation, in spite of the fact that it can easily be configured to serve as a rectifier. Experimental and simulation results are presented to validate the operation of the proposed topology and its control strategy.
author_names: Khalegh Mozaffari

Mahshid Amirabadi

Yateendra B Deshpande
title: A Single Phase Inverter/Rectifier Topology With Suppressed Double Frequency Ripple
venue: IEEE Transactions on Power Electronics
year: 2018

abstract: Stability analysis of single phase power converters controlled in stationary reference frame is now mature and well developed, by using either linear or nonlinear methods. However, for the single phase converters with synchronous reference frame (SRF) control loops, little work has been done on the evaluation of the nonlinear approaches for stability analysis. In this paper, the stability of a digital controlled single phase voltage source inverter (VSI) with SRF voltage control loop is investigated from the perspective of nonlinear system. The analysis is based on the discrete time model defined by the stroboscopic map, which is derived using the state space averaging (SSA) technique. Furthermore, two different nonlinear analysis methods, the Jacobian matrix method and the Lyapunov exponent method, are adopted to analyze the fast scale stability and the slow scale stability of the pulsewidth modulated (PWM) inverter under variations of control parameters; hence, the stability regions can be obtained. The theoretical results indicate that, for the established stroboscopic models, the Jacobian matrix method and the Lyapunov exponent method are mathematically equivalent, which means that the fast scale stability and the slow scale stability of the studied single phase VSI are consistent, especially under linear load conditions. Experimental results under resistive load, inductive resistive load, and diode rectifier load conditions are presented to support the theoretical results, which also proves that the discrete time model plus the Jacobian matrix method or the Lyapunov exponent method is capable to investigate the stability of a converter with SRF control loops accurately.
author_names: Yang Han

Xu Fang

Ping Yang

Congling Wang

Lin Xu

Josep M Guerrero
title: Stability Analysis of Digital Controlled Single Phase Inverter With Synchronous Reference Frame Voltage Control
venue: IEEE Transactions on Power Electronics
year: 2018

abstract: This paper proposes new angles constraint for selective harmonic elimination pulsewidth modulation (SHE) PWM utilized in single phase inverter applications. The proposed angles constraint naturally eliminates all triplen harmonics, whereas they conventionally appeared in all single phase output voltages. The harmonic amplitude formula is developed based on the obtained angles constraint, and then modified single phase SHE equations are defined to eliminate only specified low nontriplen harmonics. Therefore, more harmonics would be eliminated with the same switching frequency in modified SHE PWM. Five level voltage waveform has been opted to implement the introduced method, but it can be applied on all multilevel voltage waveforms such as seven level with even number of angles. Unlike the conventional SHE technique, THD is analyzable in modified SHE to find optimum values for switching angles in order to control noneliminated harmonic amplitudes and minimize THD. Moreover, the cancellation of triplen harmonics empowers a single phase inverter to supply nonlinear loads beside linear ones. Some experimental tests are accomplished using a single phase five level modified packed U cell (MPUC) inverter. Results are discussed to prove the excellent performance of a single phase MPUC inverter under both normal and harmonic loads and accurate elimination of determined triplen and nontriplen harmonics by applying the presented angles constraint.
author_names: Mohammad Sharifzadeh

Hani Vahedi

Kamal Al-Haddad
title: New Constraint in SHE PWM for Single Phase Inverter Applications
venue: IEEE Transactions on Industry Applications
year: 2018

abstract: A large amount of ripple at twice the output frequency will emerge in the input current due to the pulsating output power in a single phase inverter. A current fed type single stage single phase inverter is investigated. Based on the switch multiplexing technique, it can realise not only dc ac power conversion but also low frequency input current ripple reduction with a lower number of power switches. A control strategy is proposed, which is capable of controlling both the input and output port performance. The operation performance is analysed, including circuit parameters, efficiency and dynamic behaviour. Besides, the equivalence of control strategy and the similarity of circuit component rating are revealed between this single stage inverter and a conventional two stage inverter. The single stage inverter is preferred in the applications which are sensitive to the power switch number and low frequency input current ripple. Finally, some experimental results are performed to verify the theoretical analysis.
author_names: Youjie Shi

Bangyin Liu

Shanxu Duan
title: Modelling, control and performance analysis of a single stage single phase inverter with reduced low frequency input current ripple
year: 2018