Modified generalised integrator based control strategy for solar PV fed UPQC enabling power quality improvement

Sanjenbam, Chandrakala Devi; Singh, Bhim; Devassy, Sachin

doi:10.1049/iet-gtd.2019.1939

Cited by 30 publications

(13 citation statements)

References 28 publications

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“…with the subscript v or c representing either the voltage or current resonator, respectively; and A vj and A cj are the dynamics matrix for the jth single resonator with the same elements of A R in (14). The output matrix is…”

Section: Resonant Extended State Observer Designmentioning

confidence: 99%

“…The matrices c vj and c cj has the same structure as c R in (14). The state vector of the disturbances and references model is…”

Section: Resonant Extended State Observer Designmentioning

confidence: 99%

“…In addition, the literature shows few applications of MIMO-based multiple-resonant observer, and there are no researchers that used this strategy in UPQC systems. Some recent advances in UPQC control show the tendency to use a signal calculation control philosophy for the PQ compensator instead of using stability-based controllers that avoid instability in the UPQC operation, as in [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…However, the intelligent control techniques are not oriented to achieve the internal stability of a grid-tied UPQC, while this paper describes a stability-based design. Other recent advances, such as [14,16], provide signal-based control without any UPQC dynamic model. Instead, they apply either advanced PLL, PV-based DC links, or Kalman filters to obtain the correct signals for the power converters.…”

Section: Introductionmentioning

confidence: 99%

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Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

2021

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Performance degradation is, in general, regarded as a power quality problem. One solution to recover grid performance is through the application of a unified power quality conditioner (UPQC). Although these devices are multi-input/multi-output (MIMO) systems, the most common control strategies consist of two decoupled controllers, which neglect the coupling effects and add uncertainty to the system. For this reason, this paper proposes a multivariable resonant observer-based control strategy of a UPQC system. This method includes all significant coupling effects between this system and the grid. This strategy results in a stability-based compensator, which differs from recently proposed strategies that are based on signal calculation and cannot assure closed-loop stability. In addition, this paper introduces a simplified controller tuning strategy based on optimal conventional methods without losing closed-loop performance. It implies that the controller can be easily tuned, despite the complexity of the MIMO dynamic model. The UPQC with the resonant observer is verified on an experimental setup for a single-phase system, obtaining three relevant results for power quality improvement: (1) harmonics compensation tested with a total harmonic distortion limit of 5%; (2) sags and swells mitigation; and (3) power factor correction, achieving a unitary value on the grid side.

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Section: Resonant Extended State Observer Designmentioning

confidence: 99%

“…The matrices c vj and c cj has the same structure as c R in (14). The state vector of the disturbances and references model is…”

Section: Resonant Extended State Observer Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

2021

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“…The VSC is nothing without control algorithms which generates pulse . Thus, shunt and series part of VSCs require good control algorithms to improve the multiple power quality of the 3-phase AC primary distribution system [6][7][8]. The second order generalized integrator (SOGI) is the simple control approach which gives the information like time, magnitude and phase angle of the signals [9].…”

Section: Introductionmentioning

confidence: 99%

Discretisation of Second Order Generalized Integrator to Design the Control Algorithm of Unified Power Quality Conditioner

Hasan¹,

Singh²,

Alhazmi³

et al. 2021

Adv. sci. technol. eng. syst. j.

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In this paper, second order generalized integrator (SOGI) is discretized to design the control algorithm of unified power quality conditioner (UPQC). A UPQC is combination two voltage source converter (VSC) and VSC are connected with back to back DC link. The first one VSC is in series to maintain the desire voltage at point of common coupling (PCC) and second is connected with shunt VSC to share the reactive power demand of load. Moreover, it protects the AC mains from pollution of the load. A phase lock loop (PLL) based SOGI model is implemented to design an algorithm for UPQC under light polluted load. Whereas under highly polluted load the Laplace Transformation based PLL-SOGI model is fail to eliminate harmonics of current and voltage at PCC. Thus, a discretization of PLL-SOGI is needed to meet disadvantage. In this paper, reference current is generated under polluted load using discretization of PLL-SOGI model and compared it with actual current to pulse the gate of shunt VSC. Moreover, a feedback unit (m) is proposed to pulse the gate of series VSC under voltage sag/swell condition. A hardware setup is performed in the lab to verify the proposed algorithm under highly polluted load.

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Unified Power Quality Conditioner

Shah

Zhao

2023

Studies in Infrastructure and Control

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Modified generalised integrator based control strategy for solar PV fed UPQC enabling power quality improvement

Cited by 30 publications

References 28 publications

Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

Discretisation of Second Order Generalized Integrator to Design the Control Algorithm of Unified Power Quality Conditioner

Unified Power Quality Conditioner

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