Troubleshooting a digital repetitive controller for a versatile dynamic voltage restorer

Roldán-Pérez, Javier; García-Cerrada, Aurelio; Zamora-Macho, Juan Luis; Roncero‐Sánchez, Pedro; Acha, E.

doi:10.1016/j.ijepes.2013.11.054

Cited by 32 publications

(30 citation statements)

References 24 publications

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“…The state-feedback controller was implemented in discrete time with closed-loop poles equivalent to those in continuous time used in Section 'Application study and stability analysis' for analysis. Detailed description of the implementation of the main controller taking into account the delay in the switching VSC and the anti-aliasing filters can be found in [8].…”

Section: Experimental Results With Emrf Controllersmentioning

confidence: 99%

“…2. The main controller has been implemented taking into account the effects of sampling as in the state-variable approach in [8]. 3.…”

Section: Experimental Results With Emrf Controllersmentioning

confidence: 99%

“…6 (capital letters have been used for Laplace transformed variables and transfer functions). A state-feedback control, like the one in [8] (u 1 ¼ ÀKx, with K a gain row vector), has been used as the main controller to eliminate the resonance and to minimise the coupling effect between d and q components, giving the closedloop frequency response shown in Fig. 7 (P 0 dd ðsÞ and P 0 dq ðsÞ).…”

Section: Application Study and Stability Analysismentioning

confidence: 99%

“…However, flexibility is lost from the point of view of individual harmonics and the controller is very sensitive to frequency variations. The latter problem requires attention always and has been addressed in power electronics in [8] where a promising approximate solution is presented.…”

Section: Introductionmentioning

confidence: 99%

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Efficient multiple-reference-frame controller for harmonic suppression in custom power devices

Ochoa-Gimenez

Roldán-Pérez

García-Cerrada

et al. 2015

International Journal of Electrical Power & Energy Systems

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Section: Experimental Results With Emrf Controllersmentioning

confidence: 99%

“…2. The main controller has been implemented taking into account the effects of sampling as in the state-variable approach in [8]. 3.…”

Section: Experimental Results With Emrf Controllersmentioning

confidence: 99%

Section: Application Study and Stability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient multiple-reference-frame controller for harmonic suppression in custom power devices

Ochoa-Gimenez

Roldán-Pérez

García-Cerrada

et al. 2015

International Journal of Electrical Power & Energy Systems

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“…The most precise solution for L(z) will be one of the so-called Thiran's filters [41] which produce maximally flat group delay. However, [40] shows that a simple approximation of the delay t s · l e using a first order Pade's approximation is sufficiently precise in a typical application [42]. With the use of L(z) the stability margins of the repetitive control system are not affected because |L(e jωts )| = 1, ∀ω and the tracking steady-state errors for harmonics of the new grid frequency ω h = 2 hπ/t p are greatly reduced if compared to the case in which L(z) is not used.…”

Section: Grid-frequency Variationsmentioning

confidence: 99%

Versatile Control of STATCOMs Using Multiple Reference Frames

Ochoa-Gimenez

García-Cerrada

Roldán-Pérez

et al. 2014

Static Compensators (STATCOMs) in Power Systems

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This chapter first reviews the fundamentals of active and reactive power control using STATCOMs. Then, two current control algorithms, namely selective/ resonant controllers and repetitive controllers, are presented that provide a STATCOM with the capability of controlling the harmonics of the current injected into the PCC. Finally, the use of synchronously-rotating reference frames is generalized so that current harmonic control can also be achieved using PI controllers. An efficient application of the last technique is explained in detailed and a number of experimental results are presented. It will be demonstrated that versatile control of STATCOMs is straightforward using this technique even if the grid frequency varies. This technique can be applicable to both, traditional, strong and centralised electric power systems and those to come in the future with large amounts of distributed generation.Keywords STATCOM Á VSC Á Harmonic control Á Selective control Á Repetitive control Á Multiple reference frames M. Ochoa-Giménez Á A. García-Cerrada (&) Á J. Roldán-Pérez Á J.L. Zamora-Macho Á P. García IntroductionSTATCOMs are typical shunt power electronics-based devices (see Fig. 7.1), used in power systems for multiple purposes [1]. Originally, STATCOMs were intended for reactive power control as a superior alternative to thyristor-controlled devices such as Thyristor-Controlled Reactors (TCRs) or Thyristor-Switched Capacitors (TSCs) [2]. Reactive power compensation in TCRs and TSC depends on the point of common coupling (PCC) voltage unlike in STATCOMs which could overcome this limitation thanks to the use of electronic switches capable of controlled ON-OFF and OFF-ON commutation. Also thanks to their controlled commutation, STATCOMs provide a much faster dynamic performance [3]. STATCOMs rapidly evolved from square wave multi-pulse converters [4-6] to pulse width modulation (PWM)-controlled converters [7][8][9] making it possible a fast and accurate active and reactive power control at the PCC.Nowadays STATCOMs are used for reactive power compensation mainly, in applications such as improving fault-ride-through of wind generators [10] or compensating voltage drops at the transmission level or voltage fluctuations at the distribution level [11,12]. When STATCOMs are used in distributions systems they are often called Distribution Static Compensators (DSTATCOMs) [13].The most classical approach to the control of a STATCOM [9] (reactive power control) only addresses the control of the fundamental components of the current injected in the PCC: the positive-sequence current of the grid frequency. Meanwhile, the same shunt-connected components in Fig. 7.1 (left) namely, a voltage source converter (VSC), a transformer (optional) and a connection filter, are.1 STATCOM schematics (left) and simplified model (right), nomenclature: p and q are the instantaneous real and reactive power injected by the STATCOM into the PCC, p R is the power lost in the filter resistance, p L is the power consumed in the filter plus ...

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