Robust Extended <i>H<sub>∞</sub>
                  </i> Control Strategy Using Linear Matrix Inequality Approach for Islanded Microgrid

Armin, Maniza; Rahman, Mizanur; Rahman, Md. Mukidur; Sarker, Subrata; Das, Sajal K.; Islam, Md. Rabiul; Kouzani, Abbas Z.; Mahmud, M. A. Parvez

doi:10.1109/access.2020.3009188

Cited by 27 publications

(11 citation statements)

References 34 publications

(42 reference statements)

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“…There is consensus that, independently of the sector, the PA seeks the following: (a) to align workers' performance with the strategy of the organization; (b) to provide information about the aspects most valued by the organization; (c) the acquisition of new knowledge and competences; (d) to increase workers' motivation; (e) to provide a basis for the decisions taken in the various HRM practices (e.g., rewards management, career development, validation of the recruitment and selection process); and (f ) management of the challenges resulting from the constant transformations of the work context (Stewart and Brown, 2020). Rahman et al (2020) added that the PA is a dynamic process that is developed over five stages: (a) definition of competences (e.g., techniques, behaviours) and of the objectives to achieve in the previously defined time period; (b) putting into practice the plan established in the previous phase; (c) the performance appraisal per se, through filling in an evaluation form and its approval by the direct boss/hierarchical superior; (d) discussion of the results obtained with the collaborator, giving them feedback about their progress and the points they need to improve; and (e) planning of the objectives for the next PA cycle in accordance with the organization's strategy. The PAP can involve various players, namely: the appraisee, the direct boss, peers, subordinates, and other stakeholders (Nguyen et al, 2020).…”

Section: Conceptualizing the Functions Of The Performance Appraisalmentioning

confidence: 99%

The role of satisfaction with the performance appraisal: a comparative study between the public and private sectors

Rodrigues¹,

Gomes²,

Silva³

2023

RBGN

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Purpose -To study in Portugal (a) whether satisfaction with the performance appraisal (PA) differs depending on the sector where the workers perform their functions (private versus public), and (b) whether the relationship between workers' perception of usefulness and accuracy of the performance appraisal process (PAP) and satisfaction with the outcome of their last PA is mediated by their satisfaction with the PAP.Theoretical framework -The PA has come to occupy a prominent place in organizations, because only it can be used to measure the skills of their workers and the way they contribute to achieving organizational success both qualitatively and quantitatively.Design/methodology/approach -Eight hundred and sixty-six professionals from the public and private sectors participated in this study. Data were collected using two multi-item questionnaires and two single-item scales.Findings -The results revealed that private sector employees showed higher levels of satisfaction with their PAs than those from the public sector. Furthermore, the results indicated that the usefulness and accuracy of the PAP had a significant and positive relationship with employees' satisfaction with their last PA, and this relationship was partially mediated by satisfaction with the PAP, both in the public and private sectors.Practical & social implications of research -Regardless of the activity sector, it is fundamental that the PAP is useful and accurate; otherwise it is discredited, which prevents it from fulfilling its purpose and contributes to increasing the levels of worker dissatisfaction.Originality/value -This study clarified the differences that may emerge regarding satisfaction with PAs between the Portuguese public and private sectors. In addition, this is the first national or international study to analyse the aforementioned constructs in an integrated manner.

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Section: Conceptualizing the Functions Of The Performance Appraisalmentioning

confidence: 99%

The role of satisfaction with the performance appraisal: a comparative study between the public and private sectors

Rodrigues¹,

Gomes²,

Silva³

2023

RBGN

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“…For the same system, Javanmardi et al [18] used bilinear matrix inequalities to design the H ∞ controller. In [19], a robust extended H ∞ control strategy based on the linear matrix inequality method was proposed for islanded microgrids. These frequency controllers have illustrated that the controllers designed by considering robust strategy achieve satisfactory control performance under parameter uncertainties and disturbances.…”

Section: Literature Reviewmentioning

confidence: 99%

Adaptive constrained population extremal optimisation‐based robust proportional‐integral‐derivation frequency control method for an islanded microgrid

Zeng

Zhou

2021

IET Cyber-Syst and Robotics

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The expected penetration of renewable sources is driving the islanded microgrid towards uncertainties, which have highly influence the reliability and complexities of frequency control. To alleviate the influence caused by load fluctuations and inherent variability of renewable sources, this article proposes an optimised robust proportional-integralderivation (PID) frequency control method by taking full advantage of a robust control strategy while simultaneously maintaining the basic characteristics of a PID controller. During the process of iterated optimisation, a weighted objective function is used to balance the tracking error performance, robust stability and disturbance attenuation performance. Then, the robust PID frequency (RPIDF) controller is determined by an adaptive constrained population extremal optimisation algorithm based on self-adaptive penalty constraint-handling technique. The proposed control method is examined on a typical islanded microgrid, and the control performance is evaluated under various disturbances and parametric uncertainties. Finally, the simulation results indicate that the fitness value of the proposed method is 1.7872, which is lower than 2.9585 and 3.0887 obtained by two other evolutionary algorithms-based RPIDF controllers. Moreover, the comprehensive simulation results fully demonstrate that the proposed method is superior to other comparison methods in terms of four performance indices on the most considered scenarios. K E Y W O R D S constrained evolutionary algorithm, frequency control, islanded microgrid, population extremal optimisation, robust PID controllerThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…In (7), the switching voltage V sw (s) is carrying the multiplication of the α(s) duty cycle and voltage from the common bus terminal V bus (s). Accordingly, the capacitor voltage V 1 , which is mainly the distribution voltage among the load that needs to be considered as the controlled parameter, passing through the SN voltage can be obtained as following,…”

Section: Mathematical Modeling Of Snsmentioning

confidence: 99%

“…A general form of microgrid contains the sustainable energy sources, point of common coupling (PCC), power electronics inverter/converte, loads and so on. It can drive the load in two modes: off-grid and grid-connected mode [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Ancillary Voltage Control Design for Adaptive Tracking Performance of Microgrid Coupled With Industrial Loads

et al. 2021

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Although the utilizing of renewable energy sources (RESs) in microgrid (MG) offers a recognized solution to meet the increasing demand, it's performance depend on various meteorological factors of RESs. Again, the functioning of MGs is often affected with certain industrial load dynamics which allowing them to alter the operating region and tracking function of the MGs. The above-mentioned challenges motivate us to design the ancillary voltage control design for enabling the MGs to provide adaptive transient and tracking voltage responses over the changes of various factors like weather, consumer demand, and industrial loads. Firstly, we design an intelligent adaptive control (IAC) framework made by merging with proportional-integral (PI) regulator and artificial neural network (ANN) to sustain the regulated common bus voltage over the mentioned changes. The regulated bus voltage is forwarded to operate the industrial loads via the regulation of inverter-based secondary network (SN). A study on the variation of weather condition and consumer demand is done to show the efficacy of the IAC framework. Secondly, we propose a novel fixed control structure named model reference modified fractional-order PID (MR-F0PID) regulator to maintain the high tracking response of the MG via the control of inverter associated with the SNs. The tracking competency of this fixed control framework is analyzed over the running of a few industrial loads dynamics associated with single-phase inverter based SN and results are compared with the other related existing controllers. Moreover, a mathematical analysis for mapping the stable region is completed here to track down the closed-loop stability area. As a further study, the three-phase inverter based SN associated with several three-phase industrial load is also considered with the same DC bus and analyzed to observe the competency of the proposed fixed MR-FOPID control framework.INDEX TERMS Adaptive controller, DC bus voltage stabilizer, fractional-order regulator, microgrid control and PV source.

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Robust Extended H_∞ Control Strategy Using Linear Matrix Inequality Approach for Islanded Microgrid

Cited by 27 publications

References 34 publications

The role of satisfaction with the performance appraisal: a comparative study between the public and private sectors

The role of satisfaction with the performance appraisal: a comparative study between the public and private sectors

Adaptive constrained population extremal optimisation‐based robust proportional‐integral‐derivation frequency control method for an islanded microgrid

Ancillary Voltage Control Design for Adaptive Tracking Performance of Microgrid Coupled With Industrial Loads

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Robust Extended H∞ Control Strategy Using Linear Matrix Inequality Approach for Islanded Microgrid

Cited by 27 publications

References 34 publications

The role of satisfaction with the performance appraisal: a comparative study between the public and private sectors

The role of satisfaction with the performance appraisal: a comparative study between the public and private sectors

Adaptive constrained population extremal optimisation‐based robust proportional‐integral‐derivation frequency control method for an islanded microgrid

Ancillary Voltage Control Design for Adaptive Tracking Performance of Microgrid Coupled With Industrial Loads

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Robust Extended H_∞ Control Strategy Using Linear Matrix Inequality Approach for Islanded Microgrid