Frequency tracking of digital resonant filters for control of power converters connected to public distribution systems

Freijedo, Francisco D.; Yepes, Alejandro G.; Malvar, Jano; López, Oscar L.; Fernández-Comesaña, Pablo; Vidal, Antonio M.; Doval-Gandoy, Jesús

doi:10.1049/iet-pel.2010.0209

Cited by 44 publications

(44 citation statements)

References 19 publications

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“…Selective controllers need an extra algorithm to deal with frequency variations, which increases the computational effort [21]. Meanwhile, repetitive controllers and DFT-based controllers have difficulties to provide adaptation under grid-frequency variations [22,23].…”

Section: Application Study and Stability Analysismentioning

confidence: 99%

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: Application Study and Stability Analysismentioning

confidence: 99%

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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“…• Selective controllers need an extra algorithm to deal with frequency variations, which increases the computational effort [47].…”

Section: Investigating the Computational Burden Of The Proposed Algormentioning

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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“…However, there is no guarantee that the ratio is an integer in some situations such as: (1) The sampling frequency is not an integral multiple of the reference fundamental frequency [17]. For example, 60 Hz reference AC voltage signal requires an 166.67 delay units when the sampling frequency of the system, which should be an integral division of micro-control unit's clock frequency, is chosen as 10 kHz; (2) For distributed power generation system, it is difficult or even impossible to maintain a constant gird frequency, in which the grid frequency is also the reference voltage or current frequency of gridconnected active power filter or converter [1], [18], [19]. For instance, in a 12 kHz sampling frequency system, if the 60 Hz grid frequency fluctuates in the range from 59.5 Hz to 60.5 Hz, the ratio of the sampling frequency and the grid frequency is changing in the range from 198.35 to 201.68 accordingly; It is difficult to maintain a constant integral delay unit in digital RC.…”

Section: Introductionmentioning

confidence: 99%

Virtual delay unit based digital nk ± m-order harmonic repetitive controller for PWM converter

Liu

Zhang

Zhou

2017

2017 IEEE International Conference on Industrial Technology (ICIT)

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Abstract-Repetitive control (RC) scheme presents an attractive solution to achieve excellent steady-state tracking error and low total harmonic distortion (THD) for periodic signals. RC can produce extremely large gains at fundamental and each harmonic frequency of reference signal to achieve all harmonics suppression. However, a DC-AC inverter always has uneven THD distribution, e.g. THD concentrates at 4k ± 1 orders for signal-phase inverter, and 6k ± 1 orders for three-phase inverter. Furthermore, a digital RC requires a integral ratio of the sampling frequency and the reference frequency, whereas the digital control system cannot always meet this requirement. For example, (e.g. 60 Hz reference signal with a 5 kHz sampling frequency, or grid-connected converter under grid frequency fluctuation, etc.). In this paper, virtual delay unit (VDU) based digital nk ± m-order harmonic RC is presented to solve the problems above. The VDU produces a different virtual RC sampling frequency from the system sampling frequency. The virtual sampling frequency for digital RC can be flexibly adjusted based on the integral ratio requirement. The advantage of VDU is that it does not vary the system sampling frequency and it is easy to be realized. Furthermore, nk ± m-order harmonic repetitive controller is selected to provide a selective harmonic compensation (SHC). Experimental results of VDU based nk±m-order harmonic RC for 60 Hz single-phase DC/AC inverter with 5 kHz system sampling frequency are provided to show the effectiveness of the proposed VDU-based SHC.

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Frequency tracking of digital resonant filters for control of power converters connected to public distribution systems

Cited by 44 publications

References 19 publications

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

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

Versatile Control of STATCOMs Using Multiple Reference Frames

Virtual delay unit based digital nk ± m-order harmonic repetitive controller for PWM converter

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