A Review of Power Electronics Based Microgrids

Wang, Xiongfei; Guerrero, Josep M.; Blaabjerg, Frede; Chen, Zhe

doi:10.6113/jpe.2012.12.1.181

Cited by 152 publications

(100 citation statements)

References 84 publications

(91 reference statements)

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“…A comparison between Equs. (7) and (2) indicates that the integral term in Equ. (7) will manipulate the common bus voltage compensation signal E cmp together with the locally measured reactive power of each DG unit.…”

Section: A Proposed Control Strategymentioning

confidence: 99%

“…Distributed generation (DG) units integrate various types of DERs into networks with power electronic converters serving as interface devices. The concept of microgrid emerges to overcome the problem introduced by the high penetration of DG units [1], [2]. Microgrid is a small-scale power system with a localized cluster of DG units and loads.…”

Section: Introductionmentioning

confidence: 99%

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Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Guo¹,

Wu²,

Lin³

et al. 2016

Journal of Power Electronics

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Owing to mismatched feeder impedances in an islanded microgrid, the conventional droop control method typically results in errors in reactive power sharing among distributed generation (DG) units. In this study, an improved droop control strategy based on secondary voltage control is proposed to enhance the reactive power sharing accuracy in an islanded microgrid. In a DG local controller, an integral term is introduced into the voltage droop function, in which the voltage compensation signal from the secondary voltage control is utilized as the common reactive power reference for each DG unit. Therefore, accurate reactive power sharing can be realized without any power information exchange among DG units or between DG units and the central controller. Meanwhile, the voltage deviation in the microgrid common bus is removed. Communication in the proposed strategy is simple to implement because the information of the voltage compensation signal is broadcasted from the central controller to each DG unit. The reactive power sharing accuracy is also not sensitive to time-delay mismatch in the communication channels. Simulation and experimental results are provided to validate the effectiveness of the proposed method.

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Section: A Proposed Control Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Guo¹,

Wu²,

Lin³

et al. 2016

Journal of Power Electronics

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“…A DG based microgrid operates in either the grid-connected mode or the islanded mode [3]. In the grid-connected mode, a microgrid can be defined as a current source because it supplies power to the main grid by synchronizing the phase of the PCC (Point of Common Coupling) voltage.…”

Section: Introductionmentioning

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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“…A number of control approaches have been developed to achieve a good load sharing among parallel inverters [4]. The droop control schemes, among other options, have shown superior performances in terms of the reliability and costs, thanks to the absence of communication links [5].…”

Section: Introductionmentioning

confidence: 99%

An improved design of virtual output impedance loop for droop-controlled parallel three-phase voltage source inverters

Wang

Blaabjerg

Chen

2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-The virtual output impedance loop is known as an effective way to enhance the load sharing stability and quality of droop-controlled parallel inverters. This paper proposes an improved design of virtual output impedance loop for parallel three-phase voltage source inverters. In the approach, a virtual output impedance loop based on the decomposition of inverter output current is developed, where the positive-and negativesequence virtual impedances are synthesized separately. Thus, the negative-sequence circulating current among the parallel inverters can be minimized by using a large negative-sequence virtual resistance even in the case of feeding a balanced threephase load. Furthermore, to adapt to the variety of unbalanced loads, a dynamically-tuned negative-sequence resistance loop is designed, such that a good compromise between the quality of inverter output voltage and the performance of load sharing can be obtained. Finally, laboratory test results of two parallel three-phase voltage source inverters are shown to confirm the validity of the proposed method.

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A Review of Power Electronics Based Microgrids

Cited by 152 publications

References 84 publications

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

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

An improved design of virtual output impedance loop for droop-controlled parallel three-phase voltage source inverters

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