A Generalized Droop Strategy for Interlinking Converter in a Standalone Hybrid Microgrid

Malik, Sarmad Majeed; Sun, Yingyun; Huang, Wen; Xin, Ai; Shuai, Zhikang

doi:10.1016/j.apenergy.2018.06.002

Cited by 51 publications

(25 citation statements)

References 31 publications

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“…The basis of the droop control method is the theory of power systems that states a change in frequency or amplitude influences directly the ratio of generated powers [20]. The droop control method used in this paper is as follows [21]:…”

Section: Conventional Droop Controlmentioning

confidence: 99%

Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control

Roudbari

Beheshti

Rakhtala

2020

IET Power Electronics

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Nowadays, the demand for electrical energy is increasing, and conventional power systems will face major problems in the future if they cannot generate extra demand for electrical energy. One of the best solutions for solving extra demand for electrical energy is the use of renewable resources to produce energy. The main aim of this study is designing and controlling the microgrid voltage and frequency. This study proposed the voltage and frequency control of an islanded microgrid based on fuzzy logic controller. The system considered for this study consists of Proton-Exchange Membrane Fuel Cell (PEMFC) that connected to parallel inverters to convert DC voltage to AC voltage. The control structure is based on adaptive droop control and fuzzy voltage control loop. Also, the proposed structure controls active and reactive powers and decreases power losses of the microgrid. Simulation results are presented to show the effectiveness and robustness of the proposed control structure over the conventional proportional-integral controller. It is shown that the proposed controller has good transient response under the output voltage PEMFC variation and load changes as disturbance.

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Section: Conventional Droop Controlmentioning

confidence: 99%

Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control

Roudbari

Beheshti

Rakhtala

2020

IET Power Electronics

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“…This controller significantly boosted the security of the converters in parallel 12 . Reference 13 focused on a generalized droop approach for controlling the power injection algorithm of an islanding hybrid AC/DC microgrid. Also, a three‐dimensional system was designed based on DC voltage, network frequency and converter power 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Reference 13 focused on a generalized droop approach for controlling the power injection algorithm of an islanding hybrid AC/DC microgrid. Also, a three‐dimensional system was designed based on DC voltage, network frequency and converter power 13 . The interlinking converter (ILC) employed the droop strategies based on the network frequency and voltage for AC and DC terminals 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Also, a three‐dimensional system was designed based on DC voltage, network frequency and converter power 13 . The interlinking converter (ILC) employed the droop strategies based on the network frequency and voltage for AC and DC terminals 13 . The control system was against the voltage/frequency alterations for injecting the active power from an under‐loaded to over‐loaded network 13 .…”

Section: Introductionmentioning

confidence: 99%

“…The interlinking converter (ILC) employed the droop strategies based on the network frequency and voltage for AC and DC terminals 13 . The control system was against the voltage/frequency alterations for injecting the active power from an under‐loaded to over‐loaded network 13 . Reference 14 concentrated on an enhanced virtual synchronous generator (VSG)‐based control strategy 15 to provide an optimized dynamic operation for a hybrid AC/DC microgrid.…”

Section: Introductionmentioning

confidence: 99%

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Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

Souraki

Radmehr

Rezanejad

2020

Int Trans Electr Energ Syst

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Summary This paper proposes a new control strategy for enforcing a AC‐DC hybrid microgrid to attain stable responses in both steady state and dynamic operating conditions. The proposed controller is designed based on combining direct Lyapunov method and small signal linearization (SSL). The dynamic parts of converter control functions are achieved through providing the global asymptotical stability of the hybrid microgrid by using its total saved energy function. Then, the steady‐state components of the controller, unlike other existing Lyapunov‐based methods, are obtained according to SSL‐based mathematical terms as the main novelty of this paper. This novelty simultaneously provides several contributions within the proposed control technique structure as (a) the direct control of the PCC voltage frequency and DC‐link voltage errors, (b) the enhanced decoupling feature for DC/AC converter current, and (c) the direct control of the input voltage error for bidirectional DC/DC converter. Finally, comparative simulation results in MATLAB/Simulink software are presented to verify the superiority of proposed controller combined with SSL under AC and DC load variations, discharging/charging of storage unit, different grid power factors and AC loads shared among grid side and DC sources.

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An adaptive two‐level hierarchical controller for universal power sharing and performance enhancement of hybrid energy storage‐supported AC/DC microgrids

Jithin

Rajeev

2023

Circuit Theory & Apps

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The uncertainties in generation from renewable energy sources and randomness in electric vehicle charging/discharging make the generation and load in the grid more volatile. The large-scale integration of renewable energy sources and electric vehicles has necessitated the remodeling of conventional control schemes in the microgrid. This article presents an adaptive two-level hierarchical controller that enriches hybrid AC/DC microgrid performance. The virtual synchronous machine-based primary controller determines the operating mode of the interlinking converter. In addition, it maintains the system's stability by providing virtual inertia support. The communication-based secondary controller adaptively chooses the scaling factors based on hybrid AC/DC microgrid operating conditions. The adaptive secondary control loop implemented with the primary controller and hybrid energy storage system reduces the frequency/voltage deviations under extreme load volatility and enhances the transient and steady-state performance. The novelty of the proposed two-level hierarchical controller is that the general purpose adaptive scheme improves the power sharing in the microgrid under normal and volatile source and load conditions. The simulations and experimental results confirm the efficacy of the proposed controller. Furthermore, the hierarchical twolevel controller performance is validated using real-time experiments on a hardware-in-the-loop simulator, OPAL-RT, and Raspberry Pi microcontroller.The real-time analysis ascertains that the proposed two-level hierarchical controller effectively preserves the frequency and voltage profiles and provides accurate power sharing between the subgrids.

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A Generalized Droop Strategy for Interlinking Converter in a Standalone Hybrid Microgrid

Cited by 51 publications

References 31 publications

Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control

Voltage and frequency regulation in an islanded microgrid with PEM fuel cell based on a fuzzy logic voltage control and adaptive droop control

Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

An adaptive two‐level hierarchical controller for universal power sharing and performance enhancement of hybrid energy storage‐supported AC/DC microgrids

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