Power controllability of three-phase converter with unbalanced AC source

Ma, Ke; Liserre, Marco; Blaabjerg, Frede

doi:10.1109/apec.2013.6520231

Cited by 45 publications

(52 citation statements)

References 29 publications

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“…The most important differences are application of symmetrical components decomposition and Double Decoupled SRF Phase-locked loop (DDSRF-PLL) synchronisation in case of extended VOC control. [47,68,80,83]. It is noteworthy that the gains of the current and PLL PI controllers are the same for basic and extended control algorithms.…”

Section: Control System and Network Descriptionmentioning

confidence: 99%

Control and Grid Synchronization of Two Level Voltage Source Inverter Under Temporary Voltage Unbalance

Chmielewski

2016

Informatics Control Measurement in Economy and Environment Protection

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This paper presents the operation of grid tied, two level voltage source inverter (VSI) during network voltage unbalance. The control system was implemented in synchronous rotating reference frame dq0 (SRF). Two types of control structures were investigated herein. First utilizes the Double Decoupled SRF Phase-locked loop (DDSRF-PLL) synchronisation with positive and negative sequence currents control. Second one is simplified system that does not provide symmetrical components decomposition and decoupling for synchronisation. Simulation results exhibited a superior performance of the DDSRF-PLL control system under grid voltage unbalance.Streszczenie: Niniejszy artykuł przedstawia pracę dwupoziomowego falownika napięcia współpracującego z siecią, podczas przejściowej asymetrii napięć. System sterowania został zaimplementowany w wirującym układzie synchronicznym dq0. Przeanalizowano dwa typy sterowania. W pierwszym zastosowano metodę synchronizacji z odprzęganiem DDSRF-PLL wraz z możliwością kontroli prądów składowej zgodnej i przeciwnej. Drugi natomiast w swoje uproszczeni formie nie pozwalała na sterowanie obu składowych symetrycznych, zabrakło również odprzęgania podczas synchronizacji z siecią. Wyniki symulacji pokazały o wiele lepsze działanie pierwszej metody sterowania.

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Section: Control System and Network Descriptionmentioning

confidence: 99%

Control and Grid Synchronization of Two Level Voltage Source Inverter Under Temporary Voltage Unbalance

Chmielewski

2016

Informatics Control Measurement in Economy and Environment Protection

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“…The 2 direction further separate into many different strategies proposed on the basis of instantaneous power theory. Within those different control strategies presented in other studies, the balanced current control has always attracted special attention. In Ma et al, the control strategy for the elimination of the negative sequence current is explained using well‐known instantaneous power theory, while the cross‐coupling between positive and negative sequence has not been discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Within those different control strategies presented in other studies, the balanced current control has always attracted special attention. In Ma et al, the control strategy for the elimination of the negative sequence current is explained using well‐known instantaneous power theory, while the cross‐coupling between positive and negative sequence has not been discussed. Yazdani and Iravani use generalized sinusoidal pulse‐width modulation and voltage source converter sequence subsystem to balance the current or mitigate Direct Current (DC)‐bus voltage ripples, avoiding classical controllers and having the dynamic and steady state response susceptible to the parameter variation.…”

Section: Introductionmentioning

confidence: 99%

Grid-connected converter control during unbalanced grid conditions based on delay signal cancellation

Popadić

Dumnić

Miličević

et al. 2018

Int Trans Electr Energ Syst

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Summary Considering the recent trend in energy sector transformation towards high share of renewable energy sources, it has become very hard to imagine modern power system without the integration of power electronic devices. A grid‐connected converter will be on the forefront of future energy trading, while simultaneously striving to offer good dynamic behaviour and operation in full accordance with the relevant grid requirements. The control algorithm of the grid‐connected converter has to be capable of achieving the stable steady state operation even during the most severe faults in the system. More importantly, the power quality of the injected currents (and thus the power) needs to be kept at the maximum possible level. This paper presents the control strategy for the grid‐connected converter that offers the possibility of symmetrical grid current injection at the point of common coupling even during unbalanced grid conditions. Proposed control strategy uses delay signal cancellation in the negative sequence synchronous rotating reference frame for the mitigation of the respective current components. The negative influence of asymmetrical grid voltages, present at the point of common coupling as a result of unbalanced grid loads or faults, will be shown within the paper. The key features of the improved control method are outlined, with a special reference to basic theoretical background. The proposed method is experimentally verified using sophisticated research and development station for control of grid‐connected converter.

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“…The usual solution for decoupling the interacting positive and negative sequences of the conventional dq transform is to apply ripple filtering and/or fitting of sequence parameters [19,25]. The information of decoupled positive-sequence and negative-sequence voltage or current is applied in dual-sequence dual-loop control for one certain control target such as double-frequency-free power control [26][27][28][29][30]. Effectively, the original three-phase voltage vector (or similarly, the current vector) v abc (t) = [v a (t), v b (t), v c (t)] T is transformed to a fully decoupled five-dimensional vector…”

Section: Introductionmentioning

confidence: 99%

“…In this manner, v + À o and i + À o are a collection of the five-dimensional representation of all symmetrical components of the three-phase voltage and current, respectively. This representation can greatly simplify the control of power converters in unbalanced systems [33,[26][27][28].…”

mentioning

confidence: 99%

Modeling of unbalanced three‐phase driving‐point impedance with application to control of grid‐connected power converters

Wong

Tse

et al. 2015

Circuit Theory & Apps

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The dq transformation is widely used in the analysis and control of three-phase symmetrical and balanced systems. The transformation is the real counterpart of the complex transformations derived from the symmetrical component theory. The widespread distributed generation and dynamically connected unbalanced loads in a three-phase system inherently create unbalanced voltages to the point of common coupling. The unbalanced voltages will always be transformed as coupled positive-sequence and negative-sequence components with double-frequency ripples that can be removed by some filtering algorithms in the dq frame. However, a technique for modeling unbalanced three-phase impedance between voltages and currents of same sequences or of opposite sequences is still missing. We propose an effective method for modeling unbalanced three-phase impedance using a decoupled zero-sequence impedance and two interacting positive-sequence and negative-sequence balanced impedances in the dq frame. The proposed method can decompose a system with unbalanced resistance, inductance, or capacitance into a combination of independent reciprocal bases (IRB). Each IRB basis belongs to one of the positive-sequence, negative-sequence, or zero-sequence system components to facilitate further analysis. The effectiveness of this approach is verified with a case study of an unbalanced load and another case study of an unbalanced voltage compensator in a microgrid application.

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Power controllability of three-phase converter with unbalanced AC source

Cited by 45 publications

References 29 publications

Control and Grid Synchronization of Two Level Voltage Source Inverter Under Temporary Voltage Unbalance

Control and Grid Synchronization of Two Level Voltage Source Inverter Under Temporary Voltage Unbalance

Grid-connected converter control during unbalanced grid conditions based on delay signal cancellation

Modeling of unbalanced three‐phase driving‐point impedance with application to control of grid‐connected power converters

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