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Discussion on “A Modular Speed-Drooped System for High Reliability Integrated Modular Motor Drives”

IEEE Transactions on Industry Applications, 2018

This note studies stability of an integrated modular motor drive (IMMD) under the parallel operation scheme proposed in [1]. The IMMD consists of multiple identical motors, rotors of which are coupled with each other rigidly to collectively drive a common shaft. The objective of the parallel operation is to achieve speed regulation and load torque sharing. According to the experimental ...


A Lyapunov-Function-Based Control Strategy for Distributed Generations in Hybrid AC/DC Microgrids

2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), 2019

Microgrids are being emerged increasingly in distributed generation (DG) systems. Instabilities because of dynamic interactions among the power electronic converters available in such systems can be observed. It has been demonstrated that a hybrid network containing a number of power converters can be instable, even though each separate one is stable inherently. Hence, in this paper, a control strategy for ...


Stability Analysis of a PMSG-Based Large Offshore Wind Farm Connected to a VSC-HVDC

2018 IEEE Power & Energy Society General Meeting (PESGM), 2018

This paper presents modal analysis of a large offshore wind farm using permanent magnet synchronous generator (PMSG)-type wind turbines connected to a voltage source converter HVDC (VSC-HVDC). Multiple resonant frequencies are observed in the ac grid of offshore wind farms. Their control is crucial for the uninterrupted operation of the wind farm system. The characteristics of oscillatory modes are presented ...


Dynamic voltage restorer for mitigation of voltage sag and swell

2017 International Conference on Energy, Communication, Data Analytics and Soft Computing (ICECDS), 2017

The electrical energy is a type of easily available energy. It can be efficiently converted to different forms of energies. With the increasing trend of utilization of electrical energy, Nowadays, consumer demands the energy with power quality, which is in fact affected by various internal and external factors of the power system. The occurrence of harmonics, voltage distortion and frequency ...


Response to Discussion of “A Modular Speed-Drooped System for High Reliability Integrated Modular Motor Drives”

IEEE Transactions on Industry Applications, 2018

The authors appreciate the interest shown in their paper. In the paper under discussion, a distributed speed control strategy suitable for multi-three- phase machines with enhanced power sharing capability is presented. The focus of the paper is on the power sharing transient controllability achieved by using a sharing regulator based on the droop controller, which was introduced for the first ...


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Educational Resources on Voltage-source Converters

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IEEE-USA E-Books

  • Discussion on “A Modular Speed-Drooped System for High Reliability Integrated Modular Motor Drives”

    This note studies stability of an integrated modular motor drive (IMMD) under the parallel operation scheme proposed in [1]. The IMMD consists of multiple identical motors, rotors of which are coupled with each other rigidly to collectively drive a common shaft. The objective of the parallel operation is to achieve speed regulation and load torque sharing. According to the experimental result provided, both speed regulation and load torque sharing properties are achieved by the parallel operation scheme. However, the stability analysis of this note reveals that the load torque sharing dynamics of EVIMD is marginally stable under the operation scheme in general. This note further shows that, if appropriately implemented with a common desired speed set -point restorer, the parallel operation scheme ensures stability of the IMMD.

  • A Lyapunov-Function-Based Control Strategy for Distributed Generations in Hybrid AC/DC Microgrids

    Microgrids are being emerged increasingly in distributed generation (DG) systems. Instabilities because of dynamic interactions among the power electronic converters available in such systems can be observed. It has been demonstrated that a hybrid network containing a number of power converters can be instable, even though each separate one is stable inherently. Hence, in this paper, a control strategy for parallel voltage-source converters (VSCs) in a hybrid ac/dc microgrid is presented. The proposed strategy is based on Lyapunov function and can guarantee the global asymptotic stability of the whole system simultaneously. The proposed control strategy can be applied to any other multistage converter system. Computer simulations are provided to confirm the analytical results.

  • Stability Analysis of a PMSG-Based Large Offshore Wind Farm Connected to a VSC-HVDC

    This paper presents modal analysis of a large offshore wind farm using permanent magnet synchronous generator (PMSG)-type wind turbines connected to a voltage source converter HVDC (VSC-HVDC). Multiple resonant frequencies are observed in the ac grid of offshore wind farms. Their control is crucial for the uninterrupted operation of the wind farm system. The characteristics of oscillatory modes are presented using modal analysis and participation factor analysis. Sensitivity of critical modes to wind turbine design parameters and their impact on closed loop stability of the system are discussed. A comparison between a full wind farm model and an aggregated model is presented to show differences in the characteristics of critical modes observed in the models, and implication of using the models for stability studies It is concluded that robust control design is important for reliable operation of the system.

  • Dynamic voltage restorer for mitigation of voltage sag and swell

    The electrical energy is a type of easily available energy. It can be efficiently converted to different forms of energies. With the increasing trend of utilization of electrical energy, Nowadays, consumer demands the energy with power quality, which is in fact affected by various internal and external factors of the power system. The occurrence of harmonics, voltage distortion and frequency variations lessens the performance of the system power quality. In this paper the commonly appearing power quality issues and its mitigation technique by Dynamic Voltage Restorer is discussed.

  • Response to Discussion of “A Modular Speed-Drooped System for High Reliability Integrated Modular Motor Drives”

    The authors appreciate the interest shown in their paper. In the paper under discussion, a distributed speed control strategy suitable for multi-three- phase machines with enhanced power sharing capability is presented. The focus of the paper is on the power sharing transient controllability achieved by using a sharing regulator based on the droop controller, which was introduced for the first time by Fingas and Lehn. Galassini et al. added the outermost loop in charge of restoring the drooped output speed. The overall control strategy and the design procedure of each loop -current, sharing, and speed -is presented and validated by means of experimental results. Two off-the shelf three-phase induction machines coupled on the same shaft and controlled by a custom inverter were loaded by a third off the-shelf three-phase induction machine.

  • Steady-State Modelling of VSC MTDC for Power System Analysis in DIgSILENT Power Factory

    In this paper, a steady-state multi-terminal voltage source converter high voltage direct current (VSC MTDC) model for power system analysis in DIgSILENT PowerFactory is introduced. Power flow is one of the most important and most widely used calculation in power system analysis. Although DIgSILENT PowerFactory provides a variety of elements for building MTDC grids, it's very inefficient when using the basic elements, such as ElmVscmono and ElmDcdc, to build multi-voltage level MTDC grids for example collection of large-scale renewable energy generation cluster. The aim of this paper is to derive custom steady-state VSC HVDC models to be incorporated into built-in AC/DC power flow computations that can handle power grids with high proportion of renewable energy generation connected. The hybrid modeling methods can effectively improve the modeling efficiency and extensibility. An AC/DC power flow is implemented using DIgSILENT PowerFactory to show the validity of the steady- state models.

  • Analysis of non-characteristic harmonics generated by voltage-source converters operating under unbalanced voltage

    This paper deals with an analytical model to evaluate the non-characteristic harmonics that are generated by three-phase three-wire voltage-source converters (VSCs) operating under unbalanced sinusoidal voltage condition. This model permits the calculation of the oscillating current on the VSC dc side considering the unbalanced voltages on its ac side. It can be used to prove that the use of dc voltage control techniques to eliminate VSC dc-side double frequency voltage ripple necessarily creates three-phase currents with undesirable low frequency harmonic components on the VSC ac side. In this work, the attention is directed to the instantaneous oscillating real power component at twice the line frequency, rather than to other power components. The non-characteristic current components analyzed in this work, such as the fundamental negative sequence and third-order harmonic components of positive and negative sequences, are calculated using the proposed model in time-domain simulations. A simple model to calculate the dc-side capacitor to mitigate these non-characteristic harmonic problems is presented.

  • Current Trends in dc: Voltage-Source Converters

    High-power electronics have been employed in transmission and distribution systems for many years, using thyristor-based currentsource converters. This approach has seen approximately 200 high-voltage dc (HVdc) systems and more than 1,000 static VAR compensation systems installed worldwide. The introduction of voltagesource converters (VSCs) across the transmission and distribution voltage range has stimulated significant interest in exploring many previously inaccessible applications.

  • Grid integrated solar photovoltaic system with static compensator

    Renewable energy sources are getting more and more widespread mainly due to the fact that they are environmentally friendly. The reduced prices of Photovoltaic (PV) system components and technological developments of power electronics have also motivated the harnessing of renewable energy. The interconnection of renewable energy sources are incorporated using power electronics converters, with the aim of improving power quality at the point of common coupling (PCC). This study presents a STATCOM which is used as: a) a load reactive power compensator, b) an interface unit between the grid and renewable energy source, and c) as an effective method for real power exchange between load, grid and renewable energy source. A controller unit used for the STATCOM based on modified Icosφ algorithm by which reactive power compensation and power factor correction is done and also real power support is provided by renewable energy source through STATCOM. In this study a solar PV system is designed for 29 KWpand it is integrated with grid using STATCOM to supply partial active power of 50 kW and full reactive power of 30kVAr of load. Results show that the use of active power from solar PV system and reactive power compensation of STATCOM reduces demand of load on the grid, which in turn increase the load capacity of source.

  • Research on zero-sequence current calculation method for VSC and circulation current of parallel VSC

    Renewable energy usually adopts flexible grid connection technology which based on three-phase voltage source converter (VSC) and droop control to connect with the distribution. Zero-sequence current of three-phase VSC has influence on on-state loss current and zero-sequence circulating current. Fourier decomposition of zero-sequence voltage of three-phase VSC at valve side based on bessel function was analyzed. Steady-state zero-sequence equivalent circuit of three-phase VSC based on equivalent model of modulation was derived, and the calculation method of zero-sequence current for VSC was obtained. Simulation model of three-phase VSC using set electrical parameters was built; value of zero-sequence current at the switching frequency was obtained based on simulation model while modulation depth changed. Meanwhile, value of zero-sequence current at the switching frequency was obtained based on calculation method mentioned in this article. Correctness of proposed calculation method was verified by comparison of two methods. In addition, the trend of main components of zero-sequence current of VSC and zero-sequence circulating current increment of parallel VSC were analyzed while modulation depth changed, conclusions were consistent with the theoretical analysis.



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