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The model is so defined that it can tackle voltage fluctuation and meet the power ramp rate limitations inflicted by integration of constant-speed wind turbines at the Point of Common Coupling. The flicker mitigation and power ramp rate control problem in the presence of wind generation and variable electrical loads is defined as a nonlinear constrained optimization problem, in which voltage fluctuation is minimized as the objective function and the power ramp rate limitations are respected by the defined real-time ramp rate constraint. The problem is solved using the sequential quadratic programming method, which is a fast solver, by adjusting suitable initial points to be appropriate for real-time applications. The simulation results validate the efficiency of the proposed method and show dramatic improvement in flicker mitigation, power ramp rate control, and system rating reduction in comparison with the proportional\u2013integral control method that was developed in previous studies.<\/jats:p>","DOI":"10.1177\/0037549719856094","type":"journal-article","created":{"date-parts":[[2019,6,25]],"date-time":"2019-06-25T11:33:07Z","timestamp":1561462387000},"page":"141-150","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Optimal control of the power ramp rate with flicker mitigation for directly grid connected wind turbines"],"prefix":"10.1177","volume":"96","author":[{"given":"Esmaeil","family":"Jalalabadi","sequence":"first","affiliation":[{"name":"SNL\/CIPCE, School of ECE, College of Engineering, University of Tehran, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad Reza","family":"Salehizadeh","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashkan","family":"Rahimi kian","sequence":"additional","affiliation":[{"name":"SNL\/CIPCE, School of ECE, College of Engineering, University of Tehran, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2019,6,25]]},"reference":[{"key":"bibr1-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1007\/s00202-015-0346-1"},{"key":"bibr2-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1109\/TPWRD.2011.2161620"},{"key":"bibr3-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2012.09.019"},{"key":"bibr4-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijepes.2012.10.069"},{"key":"bibr5-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1049\/PBPO050E"},{"key":"bibr6-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2010.09.024"},{"key":"bibr7-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2010.12.001"},{"key":"bibr8-0037549719856094","doi-asserted-by":"publisher","DOI":"10.1109\/TPWRD.2004.824428"},{"key":"bibr9-0037549719856094","unstructured":"IEC 61000-4-11:1994. 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