A Double Update PWM Method to Improve Robustness for the Deadbeat Current Controller in Three-Phase Grid-Connected System

<table class="fixed-width table-group" id="tab3"><tr><td><table class="table"><colgroup><col style="width:9.34em"/><col style="width:4.56em"/><col style="width:4.64em"/></colgroup><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left"><b>Method</b></td><td class="align_center"><span width=""><b><i>k</i></b><svg height="6.51632pt" id="M147" style="vertical-align:-3.2226pt" version="1.1" viewbox="-0.0498162 -3.29372 40.8111 6.51632" width="40.8111pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0091,0,0,-0.0091,2.179,3.132)"><path d="M476 46L464 83C454 79 442 75 430 75C414 75 398 88 398 135V295C398 350 389 395 345 427C317 448 285 457 244 457C184 446 112 410 75 385C53 368 40 356 40 337C40 308 78 285 104 285C125 285 141 292 148 318C156 348 165 374 177 388C187 399 198 405 211 405C250 405 271 368 271 310V285C248 264 170 239 110 217C56 197 31 172 31 119C31 55 82 -12 169 -12C188 -12 236 20 275 46C280 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46ZM271 85C253 72 242 68 228 68C205 68 167 87 167 142C167 176 183 193 214 209C235 219 252 230 271 241V85Z" id="g22-95"></path></g><g transform="matrix(.0091,0,0,-0.0091,37.49,3.132)"><path d="M276 0V39C214 45 208 49 208 112V699C152 684 79 670 17 663V628C72 621 77 620 77 561V112C77 52 72 48 11 39V0H276Z" id="g22-106"></path></g></svg></span></td><td class="align_center"><b>THD</b></td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Single update PWM</td><td class="align_center">0.5</td><td class="align_center">2.48%</td></tr><tr><td class="align_left">Proposed method</td><td class="align_center">0.5</td><td class="align_center">2.35%</td></tr><tr><td class="align_left">Single update PWM</td><td class="align_center">2</td><td class="align_center">unstable</td></tr><tr><td class="align_left">Proposed method</td><td class="align_center">2</td><td class="align_center">2.95%</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The steady state simulation results of grid currents.</div>

Journal of Electrical and Computer Engineering

tab3

Table 3

Table 3: A Double Update PWM Method to Improve Robustness for the Deadbeat Current Controller in Three-Phase Grid-Connected System 