Active motor terminal overvoltage mitigation method for parallel voltage source inverters

Korhonen, Juhamatti; Itkonen, Toni; Strom, Juha-Pekka; Tyster, Juho; Silventoinen, Pertti

doi:10.1049/iet-pel.2011.0232

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Commercially available ratings range from several kVA to hundreds of kVA. Parallel connection techniques for inverters have been gaining increasing attentions in motor-drive systems, converter systems, and distributed generation systems [12]- [16]. Paralleled inverters can be built in numerous ways.…”

Section: Vpvmentioning

confidence: 99%

Parallel Operation of Extended Boost Quasi Z-Source Inverters for Photovoltaic System Applications

Zakerian¹,

Nazarpour²

2016

IJEEE

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Section: Vpvmentioning

confidence: 99%

Parallel Operation of Extended Boost Quasi Z-Source Inverters for Photovoltaic System Applications

Zakerian¹,

Nazarpour²

2016

IJEEE

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“…Under the condition of the maximum boost control, according to (14)(15)(16) Figure 13, which are voltage across the inverters ( in V ), voltage of capacitors ( C V ), output voltage, current waveforms of the up and down inverters and also the load current waveform, respectively. Because the duty ratio varies periodically, a small oscillation has been introduced into in V and C V .…”

Section: Maximum Boost Controlmentioning

confidence: 99%

New Hybrid Structure Based on Improved Switched Inductor Z-Source and Parallel Inverters for Renewable Energy Systems

Zakerian¹,

Nazarpour²

2015

IJPEDS

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Nowadays, more and more distributed generations and renewable energy sources, such as wind, solar and tidal power, are connected to the public grid by the means of power inverters. They often form microgrids before being connected to the public grid. Due to the availability of high current power electronic devices, it is inevitable to use several inverters in parallel for highpower and/or low-cost applications. So, inverters should beconnected in parallel to provide system redundancy and high reliability, which are important for critical customers. In this paper, the modeling, designing and stability analysis of parallel-connected three-phaseinverters are derived for application in renewable energy systems. To enlarge voltage adjustability, the proposed inverter employs an improved switched inductor Z-source impedance network to couple the main circuit and the power source. Compared with the classical Z-source inverter (ZSI) and switched inductor Z-source inverter (SL-ZSI), the proposed inverter significantly increases the voltage boost inversion ability and also can increase the power capacity and the reliability of inverter systems. The proposed topology and its performances are validated using simulation results which are obtained in Matlab/Simulink. Keyword: Modulation index Corresponding Author:Ali Zakerian, Departement of Electrical and Computer Engineering, Urmia University, Urmia, Iran. Email: zakerian.alii@gmail.com INTRODUCTIONIn some renewable energy utilization applications, the input power source is a DC voltage source which has a wide voltage variation range, such as the grid-tied photovoltaic generation and fuel cell generation. In these cases, an inverter with boost capability is required to generate electricity at low input DC voltage. Different inverter topologies meeting the requirement can be found and classified into two categories: the isolated inverters and non-isolated inverters. The isolated inverters are usually equipped with a step-up transformer which makes the system bulky and low efficiency while the non-isolated inverter is considered high efficiency and high power density [1]. There are typically two popular non-isolated topology candidates for these applications. One is the traditional two-stage boost-buck inverter (BBI), and the other one is the newly proposed Z-source inverter (ZSI) [2].The ZSI presents a new single-stage structure to achieve the voltage boost/buck character in a single power conversion stage, which has been reported in applications to renewable energysystems. The ZSI has gained popularity as a single-stage buck-boost inverter topology among many researchers. However, its boosting capability could be limited and therefore it may not be suitable for some applications requiring very high boost demanding of cascading other dc-dc boost converters. This could lose the efficiency and demand more sensing for controlling the added new stages.

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“…Besides, the parallel structure is very suitable for modular design and system reconfiguration, providing better flexibility [6][7][8][9]. Therefore, converter parallel techniques have extensive application prospects in high power applications [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, a single converter cannot meet the requirements of bulk power transmission due to the limited capacity of power electronics devices. Thus, converter parallel techniques have been duly proposed for high power applications [2–27]. Converter parallel techniques are able to increase the power rating, reliability and efficiency, as well as decrease the cost and current/voltage ripples [2–5].…”

Section: Introductionmentioning

confidence: 99%

Circulating current control strategy for parallel full‐scale wind power converters

Lyu

Zhang

Cai

et al. 2016

IET Power Electronics

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Converter parallel techniques can increase the power rating, but there is a circulating current problem. Therefore, this study focuses on the circulating current problem in parallel full-scale wind power converter systems. The general definition of circulating currents is first introduced. The concept of circulating current percentage is then defined to quantitatively analyse the relatively serious situation of circulating currents for parallel converter systems. Then, the generation mechanisms of circulating currents are analysed based on the mathematical model of circulating currents. Actually, circulating currents can be regarded as a kind of disturbance to the load currents of a parallel system. Thereby, a novel control strategy, based on circulating current feed-forward compensation for parallel converter systems, is proposed and a feed-forward controller is designed. Finally, simulations based on MATLAB/ Simulink and hardware-in-loop experiments based on RT-LAB are carried out. Both simulation and experimental results validate the proposed circulating current control method.

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Active motor terminal overvoltage mitigation method for parallel voltage source inverters

Cited by 8 publications

References 23 publications

Parallel Operation of Extended Boost Quasi Z-Source Inverters for Photovoltaic System Applications

Parallel Operation of Extended Boost Quasi Z-Source Inverters for Photovoltaic System Applications

New Hybrid Structure Based on Improved Switched Inductor Z-Source and Parallel Inverters for Renewable Energy Systems

Circulating current control strategy for parallel full‐scale wind power converters

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