Single-phase PQ theory

Haque, M. Tarafdar

doi:10.1109/psec.2002.1023074

Cited by 75 publications

(29 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is calculated considering the amplitude detection of the PLL system. According to the single-phase PQ theory [13,14,31,34], the active and reactive power can be controlled independently in the outer power control loop, and then the grid current references are generated, being a dual-loop control structure [30]. In order to regulate the power reference, an OSG system is needed to generate the quadrature components, vα and vβ.…”

Section: Control Strategy In Zero-voltage Ride-through Operationmentioning

confidence: 99%

“…The conventional dual-loop control structure in single-phase PV systems could be applied under the grid fault by directly calculating the current references [30]. When the instantaneous power theory is adopted in single-phase PV systems, the single-phase instantaneous active and reactive powers (PQ) theory [31] can be used to independently control the active and reactive power under LVRT as reported in [11][12][13][14]. In addition, the droop control methods could be considered as an alternative for regulating the active and reactive power under the grid fault [32], on condition that the grid is mainly inductive.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Zero-Voltage Ride-Through Capability of Single-Phase Grid-Connected Photovoltaic Systems

Zhang

Yang

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

Distributed renewable energy systems play an increasing role in today's energy paradigm. Thus, intensive research activities have been centered on improving the performance of renewable energy systems, including photovoltaic (PV) systems, which should be of multiple-functionality. That is, the PV systems should be more intelligent in the consideration of grid stability, reliability, and fault protection. Therefore, in this paper, the performance of single-phase grid-connected PV systems under an extreme grid fault (i.e., when the grid voltage dips to zero) is explored. It has been revealed that combining a fast and accurate synchronization mechanism with appropriate control strategies for the zero-voltage ride-through (ZVRT) operation is mandatory. Accordingly, the representative synchronization techniques (i.e., the phase-locked loop (PLL) methods) in the ZVRT operation are compared in terms of detection precision and dynamic response. It shows that the second-order generalized integrator (SOGI-PLL) is a promising solution for single-phase systems in the case of fault ride-through. A control strategy by modifying the SOGI-PLL scheme is then introduced to single-phase grid-connected PV systems for ZVRT operation. Simulations are performed to verify the discussions. The results have demonstrated that the proposed method can help single-phase PV systems to temporarily ride through zero-voltage faults with good dynamics.

show abstract

Section: Control Strategy In Zero-voltage Ride-through Operationmentioning

confidence: 99%

mentioning

confidence: 99%

Zero-Voltage Ride-Through Capability of Single-Phase Grid-Connected Photovoltaic Systems

Zhang

Yang

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…As it is introduced in [19]- [21], to obtain the same representation for single-phase systems, the fictitious vectors v g (t) and i o (t) are created by applying a phase shift of π/2 to the original signals as it is represented in the complex plane of figure 4. Thus, the real components of current and voltage are the instantaneous values of each v g (t) and i o (t) whereas the imaginary components are instantaneous values of its orthogonal versions v g (t) and i o (t).…”

Section: Modified Single Phase Pq Theorymentioning

confidence: 99%

Operation of a Photovoltaic Microinverter as Active Power Filter using the single phase P-Q Theory and Sliding Mode Control

López-Santos

Tilaguy-Lezama

Rico-Ramírez

et al. 2017

Ing.

View full text Add to dashboard Cite

Context: Microinverters are widely used in modular photovoltaic installations but its operation with reduced power is limited to inject real power into the grid. One way to optimize the use of microinverters consist of providing them the Active Power Filtering (APF) capability, which allows its use as both distributed generation and compensation unit even under unfavorable conditions of insolation. With this approach, the output stage of the microinverter can provide reactive and distortive components of power in order to compensate power quality defects of a localized load. Method: This paper proposes a non-linear control strategy to integrate the APF function in a singlephase two-stage photovoltaic microinverter. The proposal involves the use of the single-phase P-Q theory to generate the current reference, sliding mode control to achieve a robust tracking of that reference and linear robust control to maintain the power balance regulating the DC-link voltage of the microinverter. The proposed control does not require the use of low-pass filters and in turn uses a recursive average computation improving the general performance of the system. Results: The theoretical approach is validated by means of simulation results in which appropriate levels of harmonic distortion are obtained in the grid-side current for different load types and power levels. The robustness of the control system is tested by applying disturbances in the harmonic content of the load current and its power level obtaining an appropriate dynamic performance adapted to the demands of the application. Conclusions: The main advantage of this proposal is the possibility to add the active filter function to coventional microinverters extending its capability to power conditioning only integrating some algorithms. A simple design method to ensure reliability, robustness and high power quality is detailed. ResumenContexto: Los microinversores son ampliamente utilizados en instalaciones fotovoltaicas modulares pero su operación con potencia reducida es limitada a inyectar potencia real en la red. Una forma de optimizar el uso de los microinversores consiste en proveerles la capacidad para realizar Filtrado Activo de Potencia (FAP), lo que permite su uso como una unidad tanto de generación como de compensación distribuida, incluso en condiciones desfavorables de irradiación solar. Con esta propuesta, la etapa de salida del microinversor puede suministrar componentes de potencia reactiva y de distorsión para compensar defectos en la calidad de energía de una carga localizada. Método: Se propone una estrategia de control no lineal para integrar la función FAP en un microinversor fotovoltaico monofásico de dos etapas. La propuesta involucra el uso de la teoría P-Q monofásica para generar la referencia de corriente, control en modo deslizante para conseguir un seguimiento robusto de dicha referencia y control lineal robusto para mantener el balance de potencia regulando el voltaje del bus DC intermedio del microinversor. El control propuesto no r...

show abstract

“…The instantaneous p -q theory is expanded from the concept of single phase p-q theory [5], [6], [10], [19] and the corresponding voltage equations are mentioned below in eq. (1), (2) & (3).…”

Section: The Control Strategy For the Series Apf'smentioning

confidence: 99%

A new control strategy with fuzzy logic technique in distribution system for power quality issues

Babu

Dash

Bayındır

et al. 2014

2014 16th International Power Electronics and Motion Control Conference and Exposition

View full text Add to dashboard Cite

Abstract-A new control structure for two feeders, three phase four wire distribution systems (3P4W) operating with multiconverter unified power quality conditioner (MC-UPQC) is proposed in this paper. The modified synchronous reference frame theory (MSRF) is mainly used in the new controller design. The proposed system is designed and applied for two feeders of 3P4W with UPQC. This system associated with three voltage source converter which is connected commonly to two feeder distribution systems. Under linear and nonlinear load conditions, the proposed control scheme is simulated with 3P4W and it is efficiently compensate the voltage sag and reduce the total harmonics distortion. The fast dynamics response of dc link capac itor is achieved with the help of FLC controller (Fuzzy logic controller). The neutral current flowing in series transformers of the two feeders is zero with the implementation of proposed system.

show abstract

Single-phase PQ theory

Cited by 75 publications

References 6 publications

Zero-Voltage Ride-Through Capability of Single-Phase Grid-Connected Photovoltaic Systems

Zero-Voltage Ride-Through Capability of Single-Phase Grid-Connected Photovoltaic Systems

Operation of a Photovoltaic Microinverter as Active Power Filter using the single phase P-Q Theory and Sliding Mode Control

A new control strategy with fuzzy logic technique in distribution system for power quality issues

Contact Info

Product

Resources

About