H‐infinity controller for frequency and voltage regulation in grid‐connected and islanded microgrid

Sheela, A.; Vijayachitra, S.; Revathi, S.

doi:10.1002/tee.22113

Cited by 10 publications

(11 citation statements)

References 20 publications

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“…This terminal is connected to the load with an additional wire for measuring the voltage. For power sharing among inverters, conventional P-f and Q-V droop control exist as per Equations (8) and (9) and the phenomenon is explained by Soultanis et al (2007)…”

Section: Droop Control For Active and Reactive Power Sharingmentioning

confidence: 99%

“…The conventional droop controller is modified to share the load equally among the inverters when the above mentioned uncertainties occur. The voltage and frequency drop due to droop control as in Equation 8and (9). From the droop equations, it is clear that…”

Section: Modified Droop Controllermentioning

confidence: 99%

“…In conventional method, the droop values are fixed and calculated as per Equation 8and (9). The coefficients depend on the maximum power and do not change if any change in the output power of the inverter exists.…”

Section: Droop Calculation Blockmentioning

confidence: 99%

“…Modified droop controllerUnder steady state condition, the input of the integrator should be zero. So, the following conditions prevail instead of Equations(8) and(9) …”

mentioning

confidence: 99%

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Strategy for Flawless Transfer of Islanded and Grid Connected Modes with Modifed Droop Controller

Sheela*¹,

Revathi²,

Ragul³

2019

IJITEE

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Technical advances in power electronics and generation capabilities have made the possibility of Distributed Generation (DG) systems. A microgrid is an effective division of a distributed generation system which is analysed by its capability of its operation both as a grid connected and isolated condition. All independent sources operate separately when the main grid is capable of supporting voltage. In case of islanded mode, dynamics is greatly influenced by the connected sources and on the power handling ability. Control of power interfaced converters is of major concern in both the modes of operation. In grid connected mode of operation, the current of the voltage developed needs to be controlled whereas, in Isolated condition, building of voltage is required.In the islanded mode of operation, all the resources in a microgrid should be controlled in coordination with each other so that a stable and a balanced three-phase sinusoidal voltage is obtained. Conventional droop controller is modified for accurate sharing among power converters even when the measured voltage and frequency of the inverters are not the same. Droop coefficients are estimated so that power sharing is more accurate for the respective changes in the power values. They also enable the flawless transfer of the operation mode from islanded to grid connected or vice versa

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Section: Droop Control For Active and Reactive Power Sharingmentioning

confidence: 99%

Section: Modified Droop Controllermentioning

confidence: 99%

Section: Droop Calculation Blockmentioning

confidence: 99%

“…Modified droop controllerUnder steady state condition, the input of the integrator should be zero. So, the following conditions prevail instead of Equations(8) and(9) …”

mentioning

confidence: 99%

See 2 more Smart Citations

Strategy for Flawless Transfer of Islanded and Grid Connected Modes with Modifed Droop Controller

Sheela*¹,

Revathi²,

Ragul³

2019

IJITEE

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show abstract

“…Model predictive controller (MPC) and H ∞ controller have been proposed for MG operation with unmodeled load formulation in Hosen et al (2019), Dragičević (2017) and Sheela et al (2015). Despite the variation of load dynamics, these controllers show robustness.…”

mentioning

confidence: 99%

Negative Imaginary Theory-Based Proportional Resonant Controller for Voltage Control of Three-Phase Islanded Microgrid

Haque

Islam

Hasan

et al. 2020

J Control Autom Electr Syst

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This paper demonstrates the design of robust proportional resonant (PR) controller using negative imaginary (NI) theorem for voltage control of three-phase islanded microgrid (MG) application. While operating MG as the islanded mode, different types of random and unknown load dynamics affect the MG. These loads eventually deteriorate the proper execution of MG-inducing disturbances in voltage and current. Therefore, to improve the performance of the three-phase MG, a simple, second-order controller is designed with the combination of NI theory and PR (NI-PR) controller. This controller is capable of providing higher level of damping as well as excellent stability properties. The stability and effectiveness of this controller are examined through imposing uncertainties, in terms of several load dynamics as well as different fault conditions. The comparison with respect to linear quadratic regulator and model predictive controller also ascertains the robustness of the designed controller. The NI-PR controller and the system are simulated in MATLAB/SIMULINK platform. Keywords Islanded microgrid • Negative imaginary theory • Second-order controller • Voltage control • Robust performance 1 Introduction Keeping the pace with progressive advanced facilities, demand for energy is rising lavishly. But due to the environmental protection, depletion of fossil fuel and sustainable development resulted in critical need for a cleaner energy technology (Bouchebbat and Gherbi 2017; Islam et al. 2020c). Hence, renewable energy sources are playing a vital role in today's power system applications. Some popular renewable energy sources are wind energy, photovoltaic (PV) system, biomass, wave energy, hydro-power, etc. (Coelho et al. 2018). Renewable energy sources-based distributed generators (DGs) are mainly small-scale power generation

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Photovoltaic power plants in electrical distribution networks: a review on their impact and solutions

Mansouri

Lashab

Guerrero

et al. 2020

IET Renewable Power Generation

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H‐infinity controller for frequency and voltage regulation in grid‐connected and islanded microgrid

Cited by 10 publications

References 20 publications

Strategy for Flawless Transfer of Islanded and Grid Connected Modes with Modifed Droop Controller

Strategy for Flawless Transfer of Islanded and Grid Connected Modes with Modifed Droop Controller

Negative Imaginary Theory-Based Proportional Resonant Controller for Voltage Control of Three-Phase Islanded Microgrid

Photovoltaic power plants in electrical distribution networks: a review on their impact and solutions

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