Elimination of &amp;#x201C;Harmonic Transfer Through Converters&amp;#x201D; in VSC-Based Multiterminal DC Systems by AC/DC Decoupling

Tang, Lianxiang; Ooi, Boon-Teck

doi:10.1109/tpwrd.2007.905556

Cited by 27 publications

(12 citation statements)

References 18 publications

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“…However, it should be noted that, as stated in the introduction, the phasor modelling approach is used in this paper, as is customary in transient stability studies. As a result, only information about the fundamental frequency components can be obtained from this model; it is not the aim of the proposed model to study phenomena such as harmonic transfer ( [4]). When information about harmonics is needed, a detailed converter model should be used, usually implemented in an EMTP type program, and solved with very small step size.…”

Section: B Validity Of the Modelmentioning

confidence: 99%

“…Although up till now, there are no VSC MTDC systems installed or even in concrete planning phase, quite a number of publications are devoted to the subject of VSC MTDC. They deal with various aspects of MTDC operation such as location of DC faults and protection [1], [2], control strategy [3], harmonics [4], and applications in wind farms [5], [6]. Also, numerous papers exist on the modelling of two-terminal VSC HVDC systems [7], [8], [9], [10] and some on the modelling of multi-terminal CSC HVDC systems and their implementation in stability programs, e.g.…”

mentioning

confidence: 99%

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Generalized Dynamic VSC MTDC Model for Power System Stability Studies

Cole

Beerten

Belmans

2010

IEEE Trans. Power Syst.

263

142

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Section: B Validity Of the Modelmentioning

confidence: 99%

mentioning

confidence: 99%

Generalized Dynamic VSC MTDC Model for Power System Stability Studies

Cole

Beerten

Belmans

2010

IEEE Trans. Power Syst.

263

142

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“…The proposed model can account for all switching frequencies and all the side bands due to the converter modulation. Accurate prediction of the uncharacteristic side band harmonics are specially important because small ones can be greatly amplified by resonance arising from harmonic transfer through converters [90].…”

Section: Negative Sequence Perturbationmentioning

confidence: 99%

Derivation of a Small-Signal Harmonic Model for Closed-Loop Power Converters Based on the State-Variable Sensitivity Method

Lian

2012

IEEE Trans. Circuits Syst. I

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An admittance or impedance matrix of a power converter is highly desirable for harmonic analysis of a power system. However, power converters are inherently nonlinear and time-varying systems. Therefore, a small-signal harmonic model needs to be derived. While there have been many methods to obtain the small-signal models of DC-DC converters, most of these methods cannot be directly applied to AC-DC converters. Moreover, while accurate methods exist for obtaining accurate models of open-loop AC-DC converters, there are few existing methods for obtaining accurate models for closed-loop AC-DC converters. This paper proposes an analytical method for obtaining an accurate small-signal harmonic model for a power converter. The proposed method is based on state-variable sensitivity methods, which have been previously used to derive a transfer function of a DC-DC converter. This paper will show what modifications are required to extend it to derive the small-signal harmonic model of a closed-loop AC-DC converter. A small-signal harmonic model of a closed-loop pulse-width modulated (PWM) voltage source converter (VSC) with synchronous frame current controllers and a dc voltage controller is derived based on the proposed method. The results are in good agreement with large-signal simulations by means of PSCAD/EMTDC.Index Terms-Harmonics, pulse width modulation, small signal harmonic model, steady state analysis, voltage source converter.

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“…When ac currents are regulated at reference values, they are prevented from growing to destructive levels during faults. Using deadbeat control to make voltage source converters (VSCs) operate under reference current control is a frequent practice [33][34][35][36][37][38][39][40]. Most reference current control methods which depend on transforming from the a-b-c frame to the d-q frame are valid for balanced symmetrical 3-phase operation.…”

Section: Introductionmentioning

confidence: 99%

“…Under deadbeat, the VSCs have fast response, delay of two computation steps for example. Deadbeat in VSCs prevents harmonics from the dc-side from crossing over to the ac-side [39]. Deadbeat, in enforcing reference signal tracking, should stop third and odd harmonics generated by non-linearities of MMC from emerging on the ac currents.…”

Section: Introductionmentioning

confidence: 99%

Incorporating deadbeat and low‐frequency harmonic elimination in modular multilevel converters

Wang

Ooi

2015

IET Generation, Transmission & Distribution

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This study shows that modular multilevel converter (MMC) can implement deadbeat control and harmonic elimination together. MMC, under single-phase deadbeat control, tracks the current reference exclusively, so that it is: (i) safe from large destructive currents of ac faults; and (ii) free from the odd harmonics generated by the non-linearities of MMC. As a deadbeat control cannot filter even harmonics on the dc-side, harmonic elimination has to be done by joint feedbackfeedforward methods. However, the cost saving from capacitor size reduction, made possible by the harmonic elimination, comes to naught when large ac fault currents charge the capacitors to voltage levels destructive to insulated-gate bipolar transistors. Deadbeat, in preventing the flow of large fault currents, safeguards capacitor size reduction made possible by the harmonic elimination methods. Redundant protection by the methods enhances reliability. Claims are validated by simulations by SIMULINK of MATLAB.

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Elimination of “Harmonic Transfer Through Converters” in VSC-Based Multiterminal DC Systems by AC/DC Decoupling

Cited by 27 publications

References 18 publications

Generalized Dynamic VSC MTDC Model for Power System Stability Studies

Generalized Dynamic VSC MTDC Model for Power System Stability Studies

Derivation of a Small-Signal Harmonic Model for Closed-Loop Power Converters Based on the State-Variable Sensitivity Method

Incorporating deadbeat and low‐frequency harmonic elimination in modular multilevel converters

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