Another flat performance by the sputtering power-play unit triggered an experiment by the Stars in Friday’s practice.

The Stars added an extra forward to each power-play group during a 40-minute session. Loui Eriksson and Derek Roy each worked at a point, a spot usually held by a defenseman.

The intent is to increase the number of shots on net. The Stars took only two shots on goal during their five failed power-play chances during a 4-3 loss to Vancouver on Thursday. It was their lowest total since getting one shot during one 41-second power-play chance during a loss at Phoenix on Feb. 2.

The 0-for-5 matched the Stars’ worst power-play performance of the season. In the last 11 games, the Stars have gone 0-for-5 on the power play three times and are 5-for-40 overall.

Coach Glen Gulutzan made clear what he thinks the Stars didn’t do well with the man advantage against the Canucks.