Observer based current control of single-phase inverter in DQ rotating frame

Saritha, B.; Jankiraman, P. A.

doi:10.1109/pedes.2006.344427

Cited by 26 publications

(9 citation statements)

References 10 publications

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“…A single-phase current control regulation scheme based on the three-phase current controller of the previous section is widely studied and utilized in the literature [18][19][20][21]. This single-phase current controller utilizes the physical single-phase system as the alpha axis of the aforementioned controller while a fictive system is created to represent the beta axis.…”

Section: Control Structure Based On Fictive Axis Emulationmentioning

confidence: 99%

“…Although PI-based approaches can be efficiently used for current regulation of three-phase inverters, however, they exhibit shortcomings when utilized in single-phase systems. In singlephase systems, the common approach is to create a set of imaginary quantities orthogonal to those of the single-phase system so as to obtain dc quantities by means of a stationary to rotating frame (αβ to dq) transformation [18][19][20][21]. The orthogonal imaginary current component is usually obtained by phase shifting the measured real signals by a quarter of the fundamental period, Fig.…”

Section: Introductionmentioning

confidence: 99%

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Vector control of single-phase voltage source converters based on Fictive Axis Emulation

Rufer

Bahrani

Kenzelmann

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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This paper presents an alternative way for controlling the current of single-phase voltage source dc-ac inverters in a dq synchronous reference frame. In a dq reference frame, ac (time varying) quantities appear as dc (time invariant) quantities allowing the controller to be designed as for dc-dc converters presenting infinite control gain at the steady-state operating point to achieve zero steady state error. The common approach is to create a set of imaginary quantities orthogonal to those of the real single-phase system so as to obtain dc quantities by means of a stationary to rotating frame transformation. The orthogonal imaginary quantities in common approaches are obtained by phase shifting the real components by a quarter of the fundamental period. The introduction of such delay in the system deteriorates the dynamic response, which becomes slower and oscillatory. In the proposed approach of this paper, the orthogonal quantities are generated by an imaginary system called Fictive Axis, which runs concurrently with the real one. The proposed approach, which is referred to as Fictive Axis Emulation (FAE), effectively improves the poor dynamics of the conventional approaches while does not add excessive complexity to the controller structure.

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Section: Control Structure Based On Fictive Axis Emulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vector control of single-phase voltage source converters based on Fictive Axis Emulation

Rufer

Bahrani

Kenzelmann

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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show abstract

“…Among the existing controllers, the VOC control algorithm stands out because of its low current THD, low sensitivity to frequency variations, compatibility with advanced modulation techniques and capacity for decoupled control of active and reactive power [23], [24], [26] and [27].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is feasible to control the current using simple PI controllers with no steady-state error [24]. However, in a single-phase VSI, an orthogonal current signal is needed to emulate a two-phase system.…”

Section: Introductionmentioning

confidence: 99%

A Novel Parameter-independent Fictive-axis Approach for the Voltage Oriented Control of Single-phase Inverters

Ramirez¹,

Arjona²,

Hernández³

2017

Journal of Power Electronics

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This paper presents a novel Parameter-Independent Fictive-Axis (PIFA) approach for the Voltage-Oriented Control (VOC) algorithm used in grid-tied single-phase inverters. VOC is based on the transformation of the single-phase grid current into the synchronous reference frame. As a result, an orthogonal current signal is needed. Traditionally, this signal has been obtained from fixed time delays, digital filters or a Hilbert transformation. Nevertheless, these solutions present stability and transient drawbacks. Recently, the Fictive Axis Emulation (FAE) VOC has emerged as an alternative for the generation of the quadrature current signal. FAE requires detailed information of the grid current filter along with its transfer function for signal creation. When the transfer function is not accurate, the direct and quadrature current components present steady-state oscillations as the fictive two-phase system becomes unbalanced. Moreover, the digital implementation of the transfer function imposes an additional computing burden on the VOC. The PIFA VOC presented in this paper, takes advantage of the reference current to create the required orthogonal current, which effectively eliminates the need for the filter transfer function. Moreover, the fictive signal amplitude and phase do not change with a frequency drift, which results in an increased reliability. This yields a fast, linear and stable system that can be installed without fine tuning. To demonstrate the good performance of the PIFA VOC, simulation and experimental results are presented.

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“…PI-based approaches can be efficiently used for current regulation of three-phase VSCs; however, they exhibit shortcomings when utilized in singlephase systems. In single-phase systems, the common approach is to create a set of imaginary quantities orthogonal to those of the single-phase system so as to obtain dc quantities by means of a stationary-to-rotating frame (αβ to dq) transformation [23]- [26]. The orthogonal imaginary-current component is usually obtained by phase shifting the measured real signals by a quarter of the fundamental period.…”

mentioning

confidence: 99%

Vector Control of Single-Phase Voltage-Source Converters Based on Fictive-Axis Emulation

Bahrani

Rufer

Kenzelmann

et al. 2011

IEEE Trans. on Ind. Applicat.

188

103

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This paper presents an alternative way for the current regulation of single-phase voltage-source dc-ac converters in direct-quadrature (dq) synchronous reference frames. In a dq reference frame, ac (time varying) quantities appear as dc (time invariant) ones, allowing the controller to be designed the same as dc-dc converters, presenting infinite control gain at the steady-state operating point to achieve zero steady-state error. The common approach is to create a set of imaginary quantities orthogonal to those of the real single-phase system so as to obtain dc quantities by means of a stationary-frame to rotating-frame transformation. The orthogonal imaginary quantities in common approaches are obtained by phase shifting the real components by a quarter of the fundamental period. The introduction of such delay in the system deteriorates the dynamic response, which becomes slower and oscillatory. In the proposed approach of this paper, the orthogonal quantities are generated by an imaginary system called fictive axis, which runs concurrently with the real one. The proposed approach, which is referred to as fictive-axis emulation, effectively improves the poor dynamics of the conventional approaches while not adding excessive complexity to the controller structure.Index Terms-Current control, fictive-axis emulation (FAE), single-phase voltage-source converters (VSCs), vector control.

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Observer based current control of single-phase inverter in DQ rotating frame

Cited by 26 publications

References 10 publications

Vector control of single-phase voltage source converters based on Fictive Axis Emulation

Vector control of single-phase voltage source converters based on Fictive Axis Emulation

A Novel Parameter-independent Fictive-axis Approach for the Voltage Oriented Control of Single-phase Inverters

Vector Control of Single-Phase Voltage-Source Converters Based on Fictive-Axis Emulation

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