High Performance Stationary Frame Filters for Symmetrical Sequences or Harmonics Separation Under a Variety of Grid Conditions

Wang, Fei; Benhabib, Mohamed Choukri; Duarte, J.L.; Hendrix, M.A.M.

doi:10.1109/apec.2009.4802877

Cited by 12 publications

(18 citation statements)

References 12 publications

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“…It should be note that the case of grid voltage and frequency deviations is out of scope of this paper. However, as stated in [19], the applied method is robust to small-frequency variations so that a high-performance output can be achieved even under a distorted grid voltage [14]. Although according to the allowable limits of frequency-deviation of main-grid [20], a phase-locked loop (PLL) can be avoided in the gridconnected mode [14], [19], for adapting to larger-frequency changes, a PLL or a frequency adaption loop can be added to the applied filter [19], [21].…”

Section: System Description and Modellingmentioning

confidence: 92%

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Sliding Mode Control of a Grid-Connected Distributed Generation Unit under Unbalanced Voltage Conditions

Rezaei

Soltani

2016

Automatika

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Original scientific paperThe increasing presence of inverter-based distributed generation (DG) units in distribution networks (DNs) requires control methods that achieve high performance not only during normal operating conditions, but also under unbalanced conditions. With a high probability, a type of voltage unbalance in DNs is unequal three-phase voltage magnitudes at the fundamental system frequency. This can occur temporarily due to faults or permanently due to uneven distribution of unbalanced loads, on the three-phases of the DN. This paper proposes a sliding mode (SM) based controller for grid-connected DG units, under unbalanced grid voltage condition. The proposed control strategy employs a nonlinear control scheme to directly cancel out the negative-sequence (NS) components of DG output current under unbalanced voltage condition; and directly regulate the positive-sequence (PS) active and reactive power injected by DG units to main-grid. The control method proposed in this paper is shown to be robust and stable system parameter uncertainties. The validity and effectiveness of the proposed controller is verified by using time-domain simulation studies, under the MATLAB/Simulink software environment.Key words: Distributed generation, voltage source converter, sliding mode control, unbalanced voltage Upravljanje proizvodnom jedinicom spojenom na mrežu tijekom nesimetričnih napona na mreži temeljeno na kliznom režimu. Povećanje udjela distribuiranih proizvodnih jedinica povezanih na mrežu frekvencijskim pretvaračima zahtjeva metode upravljanja koje dobro djeluju tijekom normalnih uvjeta na mreži kao i u nesimetričnim uvjetima. Najčešći tip nesimetričnog napona na distribuiranoj jedinici je nesimetrična amplituda trofaznog napona na fundamentalnoj frekvenciji. To se doga a privremeno zbog kvarova ili trajno zbog nejednake distribucije nesimetričnih tereta na tri faze distribuirane proizvodne jedinice. U ovom radu predlaže se regulator temeljen na kliznom režimu za upravljanje proizvodnom jedinicom spojenom na mrežu tijekom nesimetričnih napona na mreži. Predložena strategija upravljanja koristi nelinearnu shemu upravljanja kako bi se izravno poništile inverzne komponente izlazne struje tijekom nesimetričnih uvjeta; i izravno upravlja direktnom komponentom radne i jalove snage isporučene u mrežu. Metoda upravljanja predložena u ovom radu pokazala se kao robusna i stabilna uz nesigurne parametre sustava. Opravdanost i učinkovitost predloženog regulatora provjerena je korištenjem simulacija u MATLAB/Simulinku.Ključne riječi: distribuirana proizvodnja, mrežni pretvarač, klizni režim upravljanja, nesimetrični napon

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Section: System Description and Modellingmentioning

confidence: 92%

“…Since the whole controller is designed in the stationary reference frame, the sequence detection of system voltages and currents is also realized based on a stationary frame notch filter in the αβ-frame [19]. It should be note that the case of grid voltage and frequency deviations is out of scope of this paper.…”

Section: System Description and Modellingmentioning

confidence: 99%

Sliding Mode Control of a Grid-Connected Distributed Generation Unit under Unbalanced Voltage Conditions

Rezaei

Soltani

2016

Automatika

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“…Since the whole controller is designed in the stationary frame, the sequence detection of grid voltages is also realized based on a stationary frame filter cell in the αβ-frame [21]. As shown in Fig.…”

Section: A Control Realizationmentioning

confidence: 99%

“…Because of its robustness for small frequency variations, a phase locked loop (PLL) is avoided in the experiment since the ac power supply only emulates the magnitude drop of the grid voltage. Otherwise, a PLL should be added to the filter for adapting to large frequency changes [21]. Concerning the power factor angle ϕ, defined in (31), two values are tested in the experiment.…”

Section: A Control Realizationmentioning

confidence: 99%

Pliant Active and Reactive Power Control for Grid-Interactive Converters Under Unbalanced Voltage Dips

Wang

Duarte

Hendrix

2011

IEEE Trans. Power Electron.

272

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Abstract-During voltage dips continuous power delivery from distributed generation systems to the grid is desirable for the purpose of grid support. In order to facilitate the control of inverter-based distributed power generation adapted to the expected change of grid requirements, generalized power control strategies based on symmetric-sequence components are proposed in this paper, aiming to manipulate the delivered instantaneous power under unbalanced voltage dips. It is shown that active power and reactive power can be independently controlled with two individually adaptable parameters. By changing these parameters, the relative amplitudes of oscillating power can be smoothly regulated, as well as the peak values of three-phase grid currents. As a result, the power control of grid-interactive inverters becomes quite flexible and adaptable to various grid requirements or design constraints. Furthermore, two strategies for simultaneous active and reactive power control are proposed that preserve flexible controllability; and an application example is given to illustrate the simplicity and adaptability of the proposed strategies for on-line optimization control. Finally, experimental results are provided that verify the proposed power control.

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“…Through optimizing, the parameters used in the experiment are K p =2, K r =100, and ω br =10 rad/s. Since the whole controller is designed in the stationary frame, the sequence detection of grid voltages is also realized based on a stationary frame filter cell in the α−β frame [15]. The basic filter cell can be easily implemented using a multistate-variable structure.…”

Section: A Control Realizationmentioning

confidence: 99%

Active and reactive power control schemes for distributed generation systems under voltage dips

Wang

Duarte

Hendrix

2009

2009 IEEE Energy Conversion Congress and Exposition

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High Performance Stationary Frame Filters for Symmetrical Sequences or Harmonics Separation Under a Variety of Grid Conditions

Cited by 12 publications

References 12 publications

Sliding Mode Control of a Grid-Connected Distributed Generation Unit under Unbalanced Voltage Conditions

Sliding Mode Control of a Grid-Connected Distributed Generation Unit under Unbalanced Voltage Conditions

Pliant Active and Reactive Power Control for Grid-Interactive Converters Under Unbalanced Voltage Dips

Active and reactive power control schemes for distributed generation systems under voltage dips

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