PLL-Based Seamless Transfer Control Between Grid-Connected and Islanding Modes in Grid-Connected Inverters

Tran, Thanh-Vu; Chun, Tae-Won; Lee, Hong‐Hee; Kim, Heung-Geun; Nho, Eui‐Cheol

doi:10.1109/tpel.2013.2290059

Cited by 171 publications

(61 citation statements)

References 40 publications

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“…14, the following equations are obtained: and output impedance of the inverter controlled by the inner voltage and current controllers. According to (8), the simplified small-signal model of the inverter can be drawn in Fig. 15.…”

Section: A Inner Voltage-current Controllers With a Virtual Impedancementioning

confidence: 99%

Line-Interactive UPS for Low-Voltage Microgrids

Zhang¹,

Cai²,

Zhao³

et al. 2015

Journal of Power Electronics

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Line-interactive uninterruptible power supply (UPS) systems are good candidates for providing energy storage within a microgrid. In this paper, a control scheme for a line-interactive UPS system applied in a low-voltage microgrid is presented. It is based on the Q-w and P-E droop control to achieve a seamless transition between grid-connected and stand-alone operation modes. Moreover, a new model for designing the controllers is built in the dq-frame based on the instantaneous power definition.The new-built model takes into account the dynamic performance of the output impedance of the inverter in the dq-frame and can be evaluated in the time domain. Compared to the traditional model based on the instantaneous power definition, the new-built model is more accurate to describe the dynamic performance of the system. Simulation and experimental results obtained with a microgrid consisting of two 40-kW line-interactive UPS systems are given to validate the control strategy of the line-active UPS system and the accuracy of the new-built model.

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Section: A Inner Voltage-current Controllers With a Virtual Impedancementioning

confidence: 99%

Line-Interactive UPS for Low-Voltage Microgrids

Zhang¹,

Cai²,

Zhao³

et al. 2015

Journal of Power Electronics

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“…If the load increases, the EG should be activated again and begin to control the voltage and frequency after achieving synchronization with the BESS, and the latter should quickly change the operation from voltage control to current control. The operation changes from voltage control to current control and from current control to voltage control should be carried out without excessive transient phenomena, so that no interruption in the electric power supply to the loads occurs [3][4][5]. To carry out stable mode changes, indirect current control techniques have been studied recently [6,7].…”

Section: Introductionmentioning

confidence: 99%

New Scheme for Seamless Operation for Stand-Alone Power Systems

et al. 2016

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On remote islands photovoltaic (PV) panels with battery energy storage systems (BESSs) supply electric power to customers in parallel operation with engine generators (EGs) to reduce fuel consumption and environmental burden. A BESS operates in voltage control mode when it supplies power to loads alone, while it operates in current control mode when it supplies power to loads in parallel with the EG. This paper proposes a smooth mode change of the BESS from current control to voltage control by using initial value at the output of integral part in the voltage controller, and a smooth mode change from voltage control to current control by tracking the EG output voltage to the BESS output voltage using a phase-locked loop (PLL). The feasibility of the proposed scheme was verified through computer simulations and experiments with a scaled prototype.

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“…To ensure seamless transfer between grid-connected and islanded operation modes, the voltages of different MVSI units should be synchronized in frequency, phase and amplitude [12][13][14][15]. This paper presents a synchronization method based on droop control and some research results obtained from simulations and experimentation by applying this method into the studied system.…”

Section: Introductionmentioning

confidence: 99%

Research on the synchronization control strategy for microgrid-connected voltage source inverter

Cao

et al. 2015

2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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Abstract-Microgrid is intended and featured to be able to operate in both grid-connected and islanded mode to ensure high quality and reliable power supply. In order to achieve stable operation of the microgrid-connected voltage source inverter (MVSI) units under paralleled or grid-connected mode, a novel synchronization method based on droop control is proposed in this paper. The difference of phase and amplitude between different MVSI units is detected and is used to calculate the output frequency and amplitude of the MVSI. This method can smooth transfer the MVSI units from standalone mode to paralleled mode. The simulation and experimental results show that the proposed method is effective in achieving paralleled operation of the MVSI units.

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PLL-Based Seamless Transfer Control Between Grid-Connected and Islanding Modes in Grid-Connected Inverters

Cited by 171 publications

References 40 publications

Line-Interactive UPS for Low-Voltage Microgrids

Line-Interactive UPS for Low-Voltage Microgrids

New Scheme for Seamless Operation for Stand-Alone Power Systems

Research on the synchronization control strategy for microgrid-connected voltage source inverter

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