Modular Online Uninterruptible Power System Plug‘n’Play Control and Stability Analysis

Zhang, Chi; Coelho, E.A.A.; Guerrero, Josep M.; Vasquez, Juan C.

doi:10.1109/tie.2016.2522383

Cited by 17 publications

(13 citation statements)

References 39 publications

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“…It is noted that the reactive power sharing with the droop control strategy should be always accurate in steady state in UPS system as the frequency is a global parameter for all UPS modules. Hence, by combining (6) and 7, it is seen that the active power sharing error is expressed as: (8) It can be observed from (8) that the active power sharing error is related with two factors that include the total resistance difference ( ) of the two UPS system and the voltage magnitude difference ( ). If the active power sharing error is caused by the output voltage difference between output voltages ( ) or line resistance mismatching ( ), the best way to mitigate the active power sharing error is to adjust each UPS's virtual resistance (…”

Section: B Proposed Methods For Active Power and Harmonic Powermentioning

confidence: 99%

“…However, the droop control is a load dependent strategy that can not recover the frequency and voltage deviation caused by the load. Consequently, secondary control strategy such as consensus [8] based distributed controller has been employed to compensate the frequency and voltage amplitude deviation. However, the consensus control strategy may generate large overshoot for the frequency and voltage amplitude during compensation process, which may be harmful to the sensitive load.…”

Section: Introductionmentioning

confidence: 99%

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An enhanced control scheme for uninterruptible power supply

Savaghebi

Wei

et al. 2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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To address the active power feeding issue in the parallel Uninterruptible Power Supply (UPS) system, a DC-link Voltage Protection (DCVP) control strategy is proposed in this paper. The proposed control method only relies on local load information, which increases the system reliability and robustness. Moreover, virtual resistance based regulation strategies are proposed for solving the active power sharing imbalance caused by the active power feeding and harmonic power sharing imbalanced caused by the line resistance mismatching. In addition, an anti-windup based consensus distributed controller is proposed to solve the overshoot issue during the transient time in voltage and frequency restoration. With the proposed anti-windup controller, large overshoot issue is alleviated. Finally, the feasibility of the proposed methods is verified by experimental results from the parallel UPS prototypes.

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Section: B Proposed Methods For Active Power and Harmonic Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An enhanced control scheme for uninterruptible power supply

Savaghebi

Wei

et al. 2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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show abstract

“…Also the system becomes complex, what can decrease its reliability. Interesting strategies to minimize these disadvantages have been reported [3]- [14], as the virtual impedance concept [3], [4], stability analysis [5], robust droop control [7], universal droop control [9], and improvements of virtual impedance and droop controls for different applications of VSI [13], [14]. Some works also integrate to the droop control a level of communication, which improves its performance [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Control System for Multi-Inverter Parallel Operation in Uninterruptible Power Systems

Arbugeri¹,

Pont²,

Jappe³

et al. 2019

Eletrônica de Potência

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This paper proposes a network communication system applied in a control strategy for parallel-connected multi-inverters, which is based on a distributed control system and a redundant communication system. The control system is produced by a Phased-Locked Loop (PLL) synchronism algorithm, a voltage controller and a parallelism controller. All control systems are based on instantaneous values and in the parallelism control the inverters share a single voltage reference signal. The communication system, which is the main focus of the paper, is based on two buses: one analog, which is a measurement taken from the electrical grid; and one digital, comprised of a Controller Area Network (CAN). The former allows the reference voltage of all inverters to be in synchronism and the latter keeps the reference voltage in synchronism even during a grid power outage. There is a PLL algorithm in each Voltage Source Inverter (VSI), which ensures the synchronism between the internal reference and external signal received from the grid or from the CAN. The proposed networked control system was verified in three 5 kVA three-phase VSIs operating in parallel. Experimental results with static and dynamic tests and with electrical grid interruption and return, were obtained. The networked control system is redundant and it provides increased reliability, thus it can be applied in the parallel operation of an on-line Uninterruptible Power Supply (UPS).

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“…As fontes ininterruptas de energia (UPS -Uninterruptible Power Supplies) são equipamentos utilizados para proteger cargas críticas, como é o caso de sistemas de telecomunicações, data center e computação em nuvem, contra distúrbios que ocorrem na tensão fornecida pelas concessionárias de energia [1], [2]. Podem ser classificadas como off-line, interativa ou dupla conversão, sendo esta última reconhecida por apresentar o melhor desempenho dentre os tipos citados, alimentando a carga independentemente das condições da rede pública [1].…”

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Modelagem de Pequenos Sinais no Espaço de Estados para Estruturas de Controle Hierárquico em Eixos Síncronos Aplicado ao Paralelismo de UPS Trifásicas

Venturini¹,

Jank²,

Martins³

et al. 2020

Eletrônica de Potência

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This paper proposes a small-signal modeling in synchronous reference frame for hierarchical control structures applied to the parallelism of three-phase UPS where all the control loops are included. It considers the inner current and voltage loops, virtual impedance, droop control and secondary control loops for amplitude and frequency restorations, as well as for active and reactive power equalizations. The presented modeling is developed in the state-space and consists of the linearization around an equilibrium point. The obtained models are validated through simulation results, which correspond precisely to the average values of the analyzed waveforms. Hardware-in-the-loop results confirm the functionality of the proposed modeling in the definition of the hierarchical control structure controllers gains, as well as its performance.

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Modular Online Uninterruptible Power System Plug‘n’Play Control and Stability Analysis

Cited by 17 publications

References 39 publications

An enhanced control scheme for uninterruptible power supply

An enhanced control scheme for uninterruptible power supply

Control System for Multi-Inverter Parallel Operation in Uninterruptible Power Systems

Modelagem de Pequenos Sinais no Espaço de Estados para Estruturas de Controle Hierárquico em Eixos Síncronos Aplicado ao Paralelismo de UPS Trifásicas

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