$L_{1}$ Adaptive Droop Control for AC Microgrid With Small Mesh Network

Trivedi, Ashutosh; Singh, Mukhtiar

doi:10.1109/tie.2017.2772211

Cited by 28 publications

(19 citation statements)

References 27 publications

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“…Thus, the problem could be solved if the relationship between different parameters are modified based on (7). In order to control the CCI to output active power P * and reactive power Q * , the droop control can be modified as in (15).…”

Section: A Proposed Pq-coupling Droop Control Modelmentioning

confidence: 99%

“…As shown in (15), instead of having δ − P and E − Q relationship as in conventional droop control, the proposed PQ-coupled droop control is having δE − P and E − Q relationship. This minimizes the power tracking error.…”

Section: A Proposed Pq-coupling Droop Control Modelmentioning

confidence: 99%

“…Furthermore, adaptive droop control was proposed to switch between islanded and grid-connected modes without any control switching action. Although different droop control techniques were researched, they were all developed based on the main droop control model, and is applied in inductive-coupled inverters (ICI) [15]- [19]. Capacitive-coupled inverter (CCI) is an emerging inverter topology that helps to reduce the inverter operation voltage, device rating and power loss using capacitive coupled impedance [20].…”

Section: Introductionmentioning

confidence: 99%

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PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

et al. 2019

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Droop control has been a well-known technique for power-sharing control of the grid-connected inverters. However, droop control with special strategy is required for capacitive-coupled inverters (CCIs) since the large coupling capacitance in CCI and decoupled nature in droop control massively narrow the controllable power range of droop control and makes the application impractical. So far, less work is done on the topic, and in this paper, the phenomenon of narrowed controllable power range in droop control is investigated, and a solution is proposed by introducing a novel active-reactive power (PQ)-coupling strategy. The proposed control is being tested on a laboratory CCI prototype. The simulation results and experimental verifications are presented to show the feasibility and validity of the proposed coupling droop control strategy. INDEX TERMS Droop control, capacitive coupled, grid-connected converter, power flow model, PQ accuracy.

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Section: A Proposed Pq-coupling Droop Control Modelmentioning

confidence: 99%

Section: A Proposed Pq-coupling Droop Control Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

et al. 2019

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“…Virtual impedance method, angle droop and frequency droop methods are compared in [33]. Droop control strategies are modified in [34,35] for better performance using adaptive control.…”

Section: Introductionmentioning

confidence: 99%

Small signal stability improvement of a microgrid by the optimised dynamic droop control method

Mija

Cheriyan

2019

IET Renewable Power Generation

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Renewable energy-based energy conversion technologies have become more relevant due to environmental considerations even though they are intermittent in nature. As a result, the concept of microgrid and microgrid control techniques have been evolved as major areas of power system research. Among different inverter control methods, the droopbased control method is more popular in microgrid systems due to its simplicity and non-requirement of expensive communication systems. The transient performance, power-sharing accuracy and decoupling between real and reactive power are improved by modifying the natural droop control method. In this study, the selected microgrid system consists of two inverters operating in parallel, two interconnecting lines and three loads. A state-space model of the microgrid is created based on the small-signal stability and the transient response is improved by introducing virtual impedance and dynamic droop gains. The different controller parameters are optimised using particle swarm optimisation ensuring stability. Eigenvalue analysis is done to analyse stability. The analysis of the response of the system for various disturbances validates the effectiveness of the proposed controller. The strategy developed ensures improved power-sharing capability with high values of natural droop gains without compromising stability by using optimised dynamic droop gains.

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“…The conventional droop method is more sensitive to the line impedance. To overcome this issue, a virtual impedance is added in the controller [9,10]. Whenever the total nominal power of DGs and total load demand are unequal, then the operating voltage and frequency of microgrid is other than a nominal value.…”

Section: Introductionmentioning

confidence: 99%

A Modified Control Scheme for Power Management in an AC Microgrid with Integration of Multiple Nanogrids

Talapur

Suryawanshi

2019

Electronics

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This paper proposes a modified control scheme for a grid connected microgrid, which is contrived by integrating multiple nanogrids. In the considered system, each nanogrid consists of a generation unit from solar photovoltaic (PV) along with battery energy storage (BES) system and local loads. The nanogrid has the flexibility to operate in microgrid connected mode or islanded operating mode. Similarly, the microgrid can also be operated in grid connected mode or islanded mode. To achieve appropriate load sharing between different nanogrids considering local load demands and source power availability, a modified control scheme is developed. The proposed scheme compensates for the required reactive power, harmonics and unbalanced currents locally which are demanded by the local loads in nanogrids in order to improve the power quality in the microgrid. The smooth transition between the modes of operation of nanogrids and microgrid is achieved with the proposed modified control scheme. In addition, the proposed modified control scheme allows the microgrid and main grid to remain free from transients generated by load disturbances in nanogrid and disturbances in the microgrid respectively. Therefore, the effect of disturbances on voltage and frequency of the microgrid is reduced. A simple control scheme is developed to address the challenging issues for smooth operation of the microgrid such as active power sharing among the sources based on their ratings, power quality enhancement (compensation of harmonic components, unbalanced current and reactive power) and seamless transition between the modes of operation (during islanding from grid and re-synchronisation with grid). The performance of the proposed modified control scheme is verified in a real time simulator during variable loading conditions.

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$L_{1}$ Adaptive Droop Control for AC Microgrid With Small Mesh Network

Cited by 28 publications

References 27 publications

PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

Small signal stability improvement of a microgrid by the optimised dynamic droop control method

A Modified Control Scheme for Power Management in an AC Microgrid with Integration of Multiple Nanogrids

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