This paper presents a review of characteristics and modeling of major power electronic types of harmonic sources for the power system harmonic analysis. The power electronic switching types of harmonic sources to be reviewed include static power converters, static var compensators (SVCs), and cycloconverters. Discussions and comtnents for applications of these harmonic sources in harmonic modeling and simulation also will be described.

Characteristics and Modeling of Harmonic Sources-Power Electronic Devices

This paper presents a review of characteristics and modeling of major power electronic types of harmonic sources for the power system harmonic analysis. The power electronic switching types of harmonic sources to be reviewed include static power converters, static var compensators (SVCs), and cycloconverters. Discussions and comments for applications of these harmonic sources in harmonic modeling and simulation also will be described.

Characteristics and Modeling of Harmonic Sources—Power Electronic Devices

Power supply systems in telecommunication applications employ several parallel-connected AC-to-DC and DC-to-DC power converters. Such a system offers modularity, redundancy, and is easily scalable to higher power levels. Such parallel-connected systems normally consist of several single-phase power-factor-correction (PFC) stages connected to the same input utility. In this paper, a modular single-phase PFC scheme with an integrated harmonic filtering function is presented. The proposed approach demonstrates that, with suitable modifications to the PFC control, harmonic filtering capability can be added. In other words, the PFC stage can compensate for harmonics generated by other rectifier loads connected to the same AC input terminals. The paper presents an example employing three AC-DC rectifier stages with only one AC-DC rectifier stage with PFC capability. It is shown that one PFC stage with the proposed control can compensate for harmonics generated by the other two uncompensated rectifier stages. Results from a laboratory prototype system demonstrate that the overall system meets the EN 61000-3-2 harmonic limits.

/pdf/a-modular-single-phase-power-factor-correction-scheme-with-a-4gsfecvnf0.pdf

A modular single-phase power-factor-correction scheme with a harmonic filtering function

An efficient approach to characterising harmonic currents generated by a cluster of parallel-operated AC/DC converters in the steady state is presented. The approach is carried out in the time domain and the interactions between converters are considered. In calculating harmonic currents generated by a single converter, the Poincare map-based approach is applied to increase the computational efficiency. A solution procedure that is sequentially solving a single-converter problem with detailed model in the time domain, while the others are fixed as equivalent AC current sources, is proposed to find the overall source-side harmonic currents. The computed AC-side harmonic components of each converter current are then extracted via FFT. Solutions obtained by the proposed method are compared with those obtained by using a brute-force time-domain simulation tool, Simulink. It is shown that the AC-side harmonic currents determined by the proposed approach agree well with those obtained by the time-domain simulation tool, but the solution time is significantly reduced. Therefore, the proposed approach is useful for quantifying harmonic currents generated by a cluster of AC/DC converters and to facilitate the harmonic mitigation implementations, such as passive and active harmonic filter designs, for complying with harmonic standards such as IEC 61000-3-4 and IEEE-519. In addition, the proposed approach is suitable for characterising harmonic currents generated by other types of power-electronic devices, such as AC and/or DC drives, operated in parallel simultaneously. The solution algorithm can also be integrated into a harmonic power flow program for penetration studies to provide a fast quantification of the impact of multiple harmonic sources on the power system.

Efficient approach to characterising harmonic currents generated by a cluster of three-phase AC/DC converters

Analysis of new converter topologies, large converters, multi-converter systems, line commutated converters and electrical drive systems requires an appropriate global simulation tool. Because the dynamic model of AC machines is very complex due to the nonlinearities of the system, it is necessary to simulate the whole system containing an AC machine. A user friendly simulator must be able to handle complex systems as such electrical drives by dividing them in small interconnected sub-systems (converter-machine-regulator) assembled in a modular structure. The interconnection of these sub-systems must be done in a simple manner, without additional programming, using a graphic interface. The aim of this paper is to present a new interactive power electronic systems simulation package SIMUSEC "SIMUlation des Systemes Electrotechniques en Commutation", developed in the SIMULINK environment. This package permits simulation of power converters feeding passive loads or electrical machines either in open loop or in closed loop configurations. It also permits simulation of interaction between the converter-machine setups and between converters in a multiconverter system in order to study the conducted emissions. The built-in functions and tool boxes of SIMULINK facilitate the design and the analysis of high performance AC drive systems using this package. >

SIMULINK based simulations of power electronic systems

The present work contributes to the development of a novel method of modeling a power electronic converter in terms of nonlinear current sources, and a novel method of solution for multiconverter systems using an iterative method. The algorithms that are developed based on this methodology have been incorporated in the modified version of the ATOSEC5 simulator called ATOSECM. The authors give an example with single-phase two line-commutated converters to illustrate the methodology. Also presented is a comparison between global simulation (ATOSEC5) and the method of simulation developed here (ATOSECM) for two six-pulse converters supplied by the mains. >

Global simulation of multiple power electronic converter system using a novel iterative method

The authors present a novel method of modeling a power electronic converter in terms of nonlinear current sources as well as a novel method of the solution of multi-converter systems using an iterative method. The algorithms that are developed based on this methodology have been incorporated in the modified version of the ATOSEC5 simulator called ATOSECM. They also give an example with single phase two line-commutated converters to illustrate the methodology. >

The paper presents an adaptation of the general-purpose SIMNON software for the study of alternating-current drives. With the objective of designing and dimensioning converter-AC machine-regulator systems, a simulation module named SEMAS is constructed in modular form using SIMNON. This software package shows great capabilities in terms of computing power, optimization, robustness of the algorithms and graphical interaction. Asynchronous and synchronous machine models implemented in SEMAS are presented. The different methods for modelling static converters and switches, with the particularities of each, are also presented. The results show evidence of a good agreement between simulations and experiments.

SEMAS: A new simulation module for AC drive systems

Power electronic converters generate harmonic currents that can disturb the network. To study the perturbations on the power line, it is necessary to perform a functional analysis via a global simulation. However, when the plant contains several static power converters feeding direct-current loads, global simulation becomes difficult, even impossible, because of the limitations of the software or the microcomputer used. There are no simulation tools that allow the quantitative evaluation of harmonic voltages and currents generated by a multistatic converter system. To fulfil this goal, the authors propose a new iterative analysis method for such systems and a new model for electronic power converters in terms of nonlinear current sources. This methodology has been included in a modified version of the ATOSECS software, renamed ATOSECM. The methodology is illustrated with an example of the use of ATOSECM on a personal computer for the study of two single-phase power converters connected to the same power line. A comparative analysis between global simulation (ATOSECS) and the new method of simulation (ATOSECM) is also presented for the case of two three-phase full-wave thyristor converters, with different firing angles and loads.

http://ieeexplore.ieee.org/iel7/9754/6452194/06592074.pdf

A new iterative method for the global simulation of power electronic multi-converter systems

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Papers

Global simulation of multiple power electronic converter system using a novel iterative method

Global simulation of multiple power electronic converter system using a novel iterative method

SEMAS: A new simulation module for AC drive systems

A new iterative method for the global simulation of power electronic multi-converter systems