Modified droop control for improving adaptive virtual impedance strategy for parallel distributed generation units in islanded microgrids

Sabzevari, Kiomars; Karimi, Shahram; Khosravi, Farshad; Abdi, Hamdi

doi:10.1002/etep.2689

Cited by 23 publications

(19 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This scheme is quite robust against disturbances in the load, the effect of start-up transients, and unpredictability of the PV generation. Recently several researches have been conducted on the adaptive droop control strategy for both DC MG (see A.3) as well as AC MG [63][64][65][66][67]. Figure 11.…”

Section: A6 Droop Controlmentioning

confidence: 99%

“…illustrate virtual impedance-based adaptive droop control in AC MG. Primarily this strategy minimizes the current sharing difference and the circulating current among the power converters connected in the MG [64]. So further, this control strategy investigated by many researchers for loss minimization [65], power-sharing management [66], and efficiency enhancement [67] of MG.…”

Section: A6 Droop Controlmentioning

confidence: 99%

See 1 more Smart Citation

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Ansari¹,

Chandel²,

Tariq

2021

IEEE Access

View full text Add to dashboard Cite

Owing to the smart lifestyle, environmental consciousness, and dwindling fossil fuel supplies, there is a huge demand for clean and green energy. Microgrid (MG) is a crucial approach to renewable and clean energy. Because of the success of the AC utility grid and the growing demand for critical loads, it is very convenient to provide AC/DC MG that can easily satisfy both the alternating current (AC) MG and the direct current (DC) MG requirements. Due to uncertainty in load variations, main grid failures, intermittent power generations from renewable energy sources (RESs), the synchronization and interconnection of different power converters are the paramount issues in the control of AC/DC MG. This paper presents an overview-oriented state of the art in the recent advancement in control strategies of AC/DC MG and its associated power converters control. Based on recent research, this paper summarizes unobstructed views on different topologies, types of power converters, power converter controls, and control strategies of AC/DC MG. Finally, it identified some future challenges that need to be addressed in order to develop a sustainable and reliable control strategy for AC/DC MG. This paper will serve as a guide for researchers. INDEX TERMS Distributed generation, Microgrids, AC/DC Microgrid, Centralized control, Decentralized control I. INTRODUCTION MGs compromise different RESs, i.e., PV cells, windmills, energy-storing systems (ESS), diesel generator sets, and small hydropower plants, as discussed in the [1,2]. With the advancements in power semiconductor devices, the integration of RESs with leading utility or MG becomes so more accessible. Based on the adopted topology, there are three types of MGs, classified as DC MG, AC MG, and AC/DC MG or hybrid MG [3]. The DC MGs are preferred to supply critical loads like computers, operation theatres, and billing counters. Whereas the AC MGs are preferred in supplying all loads during off-grid or on-grid. The AC/DC MG possesses the characteristics of both DC MG and AC MG. Since begin, in these types of MGs, the power converters are connected in parallel with the MG bus-bar and belong to the parallel topology of MG. Recently a seriescascaded MG topology is being investigated. Inam Ullah Nutkani and et al. in [4] has presented a series-cascaded AC MG topology to integrate the non-dispatchable RESs to the MG and offered its advantages and disadvantages over the parallel topology. Fig.1 shows the different topological advances of MGs.

show abstract

Section: A6 Droop Controlmentioning

confidence: 99%

Section: A6 Droop Controlmentioning

confidence: 99%

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Ansari¹,

Chandel²,

Tariq

2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…In this paper, the event is analyzed and a control solution is proposed and validated by modeling and simulation. Considering multiple DGs in an islanded microgrid, a control scheme is developed by integrating droop and feedback controls in order to achieve proper power dispatch and stabilize the system 20‐22 …”

Section: Introductionmentioning

confidence: 99%

Dynamics and control of microgrids as a resiliency source

Lee

Liu

et al. 2020

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

Microgrids can be operated in a utility‐connected mode or an islanded mode in separation with the transmission or distribution system. As major disasters occur, intentional islanding of a microgrid is a possible solution to serve critical loads, within or outside the microgrids, until the utility service is restored. Through a field test, the technical feasibility to utilize microgrids as a resiliency resource is evaluated. Waveforms of the system dynamics are recorded, and the acquired data and measurements are analyzed and compared with simulation results. Technical issues arising from the starting of an islanded microgrid have been identified. The parallel operation of distributed generators is a major issue in the field test. With different droop characteristics, the dispatch rule of real and reactive power between the DGs is established. Based on the field test experience, a control scheme integrating droop control and feedback control is designed for proper power dispatch among DGs and frequency/voltage control in a microgrid. During the parallel operation, regulation of the frequency and voltage within an acceptable range is provided by the proposed control method. The proposed dispatch and control capabilities would significantly improve the dynamic performance of the microgrid. Simulation results based on a modified IEEE 13‐node test feeder validate the performance of the control strategy.

show abstract

“…The virtual impedance loop had been designed that is dependent on values of the feeder's physical impedance which can never be accurate and in case of adaptive virtual impedance the computational burden is the drawback of the control schemes. Reactive power-sharing improvement control strategy with the capacitive or inductive droop with the loop of virtual impedance implemented in [20][21][22][23], where the point of common coupling information and the line impedance measurements are much complicated and reactive power sharing errors are not removed up to the desired level. Moreover, the abrupt change in loads and plug and play feature of the microgrid system does not afford any fixed configuration.…”

Section: Introductionmentioning

confidence: 99%

Multiloop low bandwidth communication-based power sharing control for microgrids

Pathan

Bakar

Khan

et al. 2020

IJEECS

View full text Add to dashboard Cite

<span>In parallel-connected inverter-based microgrids, the reactive power sharing accuracy can not have satisfactory results effortlessly. Mismatch in feeder impedances of the parallel-connected inverter-based microgrids is a significant cause of inaccurate reactive power-sharing. In voltage source inverters (VSI) based microgrids, especially for the islanded mode of operation, the conventional centralized or decentralized control techniques are not much helpful to control the voltage deviations due to impedance mismatch. Mismatch of the feeder impedance is compensated by the addition of fixed virtual impedance. Whereas, the change in the virtual impedance is compensated by adaptive virtual impedance-based control techniques which are helpful to mitigate power-sharing errors, but in most of the control schemes virtual impedance-based control mechanism needs pre-knowledge of feeder impedance which increases the computational burden. This paper presents a decentralized virtual impedance-based power sharing control. In the proposed control solution to mitigate reactive power sharing errors in distributed generation (DG) units, mismatch of the parallel-connected feeder impedance is equalized by regulating the addition of equivalent impedance to each DG inverter. Proposed control technique offers an independent implementation without any pre-knowledge of the feeder impedance. Hence, the implementation of the control scheme is a straightforward and computational burden is also reduced. Simulation results show the effectiveness of the control scheme. </span>

show abstract

Modified droop control for improving adaptive virtual impedance strategy for parallel distributed generation units in islanded microgrids

Cited by 23 publications

References 19 publications

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Dynamics and control of microgrids as a resiliency source

Multiloop low bandwidth communication-based power sharing control for microgrids

Contact Info

Product

Resources

About