Control Method of Parallel Inverters with Self-Synchronizing Characteristics in Distributed Microgrid

Yan, Xiangwu; Cui, Yang; Cui, Sen

doi:10.3390/en12203871

Cited by 11 publications

(11 citation statements)

References 23 publications

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“…By considering the value of the line resistance deviating 50% and the voltage amplitude difference between DG n and the point of common coupling to be 15 V, the estimated value of |D pn | can be calculated according to (7). By using the parameters in Table 2, one can roughly obtain the theoretical bound value of |D pn | to be about 5.8 × 10 4 .…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…As a result, the coupling always exists between active and reactive power control, which will weaken the system control performance. Therefore, the virtual impedance with different components is often introduced to change the impedance characteristics of the system [6][7][8]. However, the virtual impedance method may bring about a voltage drop on the voltage reference, which will deteriorate the voltage quality, and make the voltage more sensitive to the change of load currents.…”

Section: Introductionmentioning

confidence: 99%

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Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid

Zhang

Wai

2021

Energies

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With a focus on the problems of active power sharing and voltage deviation of parallel-connected inverters in an islanded micro-grid (MG), in this study, the power-voltage droop controller and the inner voltage regulator are redesigned based on a total sliding-mode control (TSMC) technique. As for the power-voltage droop control loop, a droop control relation error between the active power and the point-of-common-coupling (PCC) voltage amplitude is defined. Then, the TSMC scheme is adopted to reach the new droop control relation, where the active power sharing and voltage amplitude recovery can be achieved simultaneously. Owing to the faster dynamic response and strong robustness provided by the TSMC framework, high-precision active power sharing during transient state also can be ensured without the influence of line impedances. The power allocation error can be improved by more than 81.2% and 50% than the conventional and proportional-integral (PI)-based droop control methods, respectively, and the voltage deviation rate can be reduced to 0.16%. Moreover, a small-signal model of the TSMC-based droop-controlled system is established, and the influences of control parameters on the system stability and the dynamic response are also investigated. The effectiveness of the proposed control method is verified by numerical simulations and experimental results.

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid

Zhang

Wai

2021

Energies

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“…In the traditional VSG reactive voltage control strategy, the setting of the droop coefficient D q is closely related to the output reactive power of VSG and the voltage in the first section of the line. However, the droop coefficient deviation caused by line impedance voltage drop and power loss cannot be disregarded [21]. The precise droop control effect of reactive power-voltage at the end of the line (i.e., user side) should be given increased attention.…”

Section: Limitations Of Vsg Control Power Distributionmentioning

confidence: 99%

Precise Reactive Power-Voltage Droop Control of Parallel Virtual Synchronous Generators That Considers Line Impedance

et al. 2021

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Problems such as high power coupling, low distribution accuracy, and insufficient reactive power-voltage droop accuracy occur when distributed generators are operated in parallel due to the influence of line impedance. The precise control of output reactive power and voltage is difficult to achieve using traditional virtual synchronous generator (VSG) control. Taking this into consideration, this study proposes a virtual synchronous generator reactive power-voltage integrated control strategy that considers line parameters to solve this problem. First, the impedance voltage drop of the line is compensated for in accordance with local information control to ensure the consistency of the control voltage in parallel operation of distributed generators and to realize the precise droop control of reactive power and the voltage of the point of common coupling (UPCC). Second, virtual negative impedance control is added to change the equivalent output impedance characteristics of the system and achieve power decoupling. On this basis, the active frequency and reactive voltage decoupling control effect of the improved control strategy is quantified and analyzed using the relative gain matrix. The accuracy of reactive power distribution and droop control is theoretically derived and analyzed by establishing a small-signal model of a two-machine parallel system. Finally, the accuracy and effectiveness of the proposed integrated control strategy are verified via a simulation model and an experimental platform for parallel operation. Results show that the proposed integrated control strategy can effectively solve the problems of power decoupling and accurate distribution, reduce system loop current, and realize accurate reactive power-voltage droop. Compared with the traditional VSG control strategy, the dynamic deviation of UPCC is reduced by at least 40% when a large-scale load disturbance occurs.

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“…HE spreading of renewables and distributed generation in last decades has led to increase the use of grid-connected inverters. Indeed, inverters must be used to interface DC sources [1] (e.g. photovoltaics [2,3] and storage systems) with the AC grid.…”

Section: Introductionmentioning

confidence: 99%

A State-Space Approach to the Modelling and Control of the Neutral Leg of a Four Legs, Three-Phase Inverter

Passalacqua

Grosjean

Kissling

et al. 2022

IEEE Trans. Ind. Electron.

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In this paper, a novel approach to determine the model of an ICNL (Independently Controlled Neutral Leg) is proposed. Based on this model, a cascaded control method is developed to provide a steady neutral point connection for a three-phase four-wire inverter and to balance the two DC capacitors voltages of a split DC-bus. Validation of the model is realised by simulations and the control has been tested by experiments. Results have shown good performance even with a high level of neutral current, which demonstrate the ability of the system to work within an unbalanced load or grid.

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Control Method of Parallel Inverters with Self-Synchronizing Characteristics in Distributed Microgrid

Cited by 11 publications

References 23 publications

Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid

Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid

Precise Reactive Power-Voltage Droop Control of Parallel Virtual Synchronous Generators That Considers Line Impedance

A State-Space Approach to the Modelling and Control of the Neutral Leg of a Four Legs, Three-Phase Inverter

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