Droop method for high-capacity parallel inverters using virtual impedance

Jung, Kyosun; Lim, Kyungbae; Kim, Dong Hwan; Choi, Jaeho

doi:10.1109/icpe.2015.7167903

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…As shown in (12), the voltage-real power droop has been used and the voltage drops of both the line impedance and the virtual resistor have been considered to reduce the real power sharing error [16].…”

Section: Proposed Active and Reactive Power Sharingmentioning

confidence: 99%

A Droop Method for High Capacity Parallel Inverters Considering Accurate Real Power Sharing

Kim¹,

Jung²,

Lim³

et al. 2016

Journal of Power Electronics

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This paper presents DG based droop controlled parallel inverter systems with virtual impedance considering the unequal resistive-inductive combined line impedance condition. This causes a reactive power sharing error and dynamic performance degradation. Each of these drawbacks can be solved by adding the feedforward term of each line impedance voltage drop or injecting the virtual inductor. However, if the line impedances are high enough because of the long distance between the DG and the PCC or if the capacity of the system is large so that the output current is very large, this leads to a high virtual inductor voltage drop which causes reductions of the output voltage and power. Therefore, the line impedance voltage drops and the virtual inductor and resistor voltage drop compensation methods have been considered to solve these problems. The proposed method has been verified in comparison with the conventional droop method through PSIM simulation and low-scale experimental results.

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Section: Proposed Active and Reactive Power Sharingmentioning

confidence: 99%

A Droop Method for High Capacity Parallel Inverters Considering Accurate Real Power Sharing

Kim¹,

Jung²,

Lim³

et al. 2016

Journal of Power Electronics

Self Cite

View full text Add to dashboard Cite

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Renewable energy source (RES) based islanded DC microgrid with enhanced resilient control

Shahid

Khan

Hashmi

et al. 2019

International Journal of Electrical Power & Energy Systems

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A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

et al. 2018

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Abstract:Communication-based distributed secondary control is extensively used in DC microgrids. Compared to centralized control, it can provide better voltage regulation and load sharing in microgrids. A conventional secondary control technique that converges the system to a common operating point is improved by using the control methodology to detect the communication link failure and stabilize the system operation during communication islanding. Recently, more robust control schemes have been proposed to improve resilience, but communication islanding has not been addressed at the secondary level control for which the system requires additional tertiary control. However, link failure is a possibility in the microgrid, so this paper proposes a control scheme at the secondary level to detect communication islanding. Communication islanding may lead the system to unpredictable behavior, which may cause the system to become unstable and may further lead to a cascading failure. The proposed control scheme sustains the stability and operation of a DC microgrid. Voltage and current observer works in a parallel manner with the proposed secondary control to achieve a correction term for global operating points. The proposed control scheme has been verified through analysis and simulation.

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Droop method for high-capacity parallel inverters using virtual impedance

Cited by 3 publications

References 13 publications

A Droop Method for High Capacity Parallel Inverters Considering Accurate Real Power Sharing

A Droop Method for High Capacity Parallel Inverters Considering Accurate Real Power Sharing

Renewable energy source (RES) based islanded DC microgrid with enhanced resilient control

A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

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