An Optimal Control Scheme for Load Bus Voltage Regulation and Reactive Power-Sharing in an Islanded Microgrid

Khan, Muhammad Mansoor; Mu, Chaoxu; Habib, Salman; Hashmi, Khurram Azeem; Ahmed, Emad M.; Alhosaini, Waleed

doi:10.3390/en14206490

Cited by 4 publications

(4 citation statements)

References 42 publications

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“…An increase/decrease in load may cause power loss/excess. Power restoration operations such as motor slip readjustment, transformer tap changing, and voltage regulation operation are applied to control stability issues [147,148]. In some cases, to overcome the stability issues and load balance anomalies on the distribution side, a virtual operator module that simulates actions and mitigation measures of grid operators is used.…”

Section: Stability Issues In the Primary And Secondary Layermentioning

confidence: 99%

Enhancing Microgrid Stability and Energy Management: Techniques, Challenges, and Future Directions

Safder,

Sanjari,

Hamza

et al. 2023

Energies

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Microgrid technology offers a new practical approach to harnessing the benefits of distributed energy resources in grid-connected and island environments. There are several significant advantages associated with this technology, including cost-effectiveness, reliability, safety, and improved energy efficiency. However, the adoption of renewable energy generation and electric vehicles in modern microgrids has led to issues related to stability, energy management, and protection. This paper aims to discuss and analyze the latest techniques developed to address these issues, with an emphasis on microgrid stability and energy management schemes based on both traditional and distinct approaches. A comprehensive analysis of various schemes, potential issues, and challenges is conducted, along with an identification of research gaps and suggestions for future microgrid development. This paper provides an overview of the current state of the field and proposes potential areas of future research.

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Section: Stability Issues In the Primary And Secondary Layermentioning

confidence: 99%

Enhancing Microgrid Stability and Energy Management: Techniques, Challenges, and Future Directions

Safder,

Sanjari,

Hamza

et al. 2023

Energies

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show abstract

“…Remark 1. In Equation ( 31), if sign(s) is considered in the control law, it causes chattering phenomenon.To prevent this problem, and make a smooth signal, here we use tanh(s) instead of sign(s), as explained in [31].…”

Section: Current Control and Load Sharing Between Dgsmentioning

confidence: 99%

“…Figure 4 shows the total harmonic distortion of the load voltage and current as 0.12% and 0.1%, respectively. According to the IEEE 519 standard for total harmonic distortion [31], the THDs for load voltage and current have acceptable values.…”

Section: Scenario 1: Steady State Operationmentioning

confidence: 99%

Sliding Mode Controller for Parameter-Variable Load Sharing in Islanded AC Microgrid

et al. 2022

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Controlling voltage, frequency, and current in an islanded microgrid is a challenging problem because the distributed generation sources, stochastic and intermittent in nature, are not connected to the main electricity network to provide stable and clean energy. Therefore, the design of a robust controller to control the output parameters of the islanded microgrid and suppress load variations and disturbances is essential. In this paper, a hysteresis controller is proposed and designed to control the output voltage of an islanded AC microgrid and an improved sliding mode controller (SMC) based on adaptive control principle is designed to control the current of the microgrid. The current controller consists of two parts: An adaptation part, which aims to eliminate disturbances and system uncertainties, and a second part, which aims to deal with the tracking problem of the system under parameter-varying topologies. The adaptation strategy has the advantage of solving the gain tuning problem and chattering reduction. It also requires limited information about disturbance and uncertainties of the system. To validate the proposed control methodology and show its effectiveness, a case study of a simulated islanded microgrid is presented. The results show that the proposed controllers can effectively control the current and voltage underload changes and increase the stability and resilience of the microgrid. The results also reveal that the performance of the proposed controller in terms of total harmonic distortion (THD) and dynamic response overcome the performance of conventional controller by a 4× reduction in THD and 40–200× reduction in settling time.

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“…Various strategies have been used to increase MG stability. The major methods are focused on enhancing control strategies of shading load control concepts and reactive power compensation techniques [25][26][27]. When the larger generator is lost, a backup energy storage supply is inserted for the load shading process.…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement of an Islanded Microgrid with the Support of Electrical Vehicle and STATCOM Systems

et al. 2023

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Modern electrical power systems now require the spread of microgrids (MG), where they would be operating in either islanded mode or grid-connected mode. An inherent mismatch between loads and sources is introduced by changeable high renewable share in an islanded MG system with stochastic load demands. The system frequency is directly impacted by this mismatch, which can be alleviated by incorporating cutting-edge energy storage technologies and FACTS tools. The investigated islanded MG system components are wind farm, solar PV, Electric vehicles (EVs), loads, DSTATCOM, and diesel power generator. An aggregated EVs model is connected to the MG during uncertain periods of the generation of renewable energy (PV and wind) to support the performance of MGs. The ability to support ancillary services from the EVs is checked. DSTATCOM is used to provide voltage stability for the MG during congestion situations. The MG is studied in three scenarios: the first scenario MG without EVs and DSTATCOM, the second scenario MG without DSTATCOM, and the third scenario MG with all components. These scenarios are addressed to show the role of EVs and DSTATCOM, and the results in the third scenario are the best. The system voltage and frequency profile is the best in the last scenario and is entirely satisfactory and under the range of the IEEE standard. The obtained results show that both EVs and DSTATCOM are important units for improving the stability of modern power grids. The Matlab/Simulink program is considered for checking and validating the dynamic performance of the proposed configuration.

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An Optimal Control Scheme for Load Bus Voltage Regulation and Reactive Power-Sharing in an Islanded Microgrid

Cited by 4 publications

References 42 publications

Enhancing Microgrid Stability and Energy Management: Techniques, Challenges, and Future Directions

Enhancing Microgrid Stability and Energy Management: Techniques, Challenges, and Future Directions

Sliding Mode Controller for Parameter-Variable Load Sharing in Islanded AC Microgrid

Performance Enhancement of an Islanded Microgrid with the Support of Electrical Vehicle and STATCOM Systems

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