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Consider posting such CLOD dyr entry to check for errors. Many times load dynamic models do not work well with loads at a bus with very low voltage (Vpu > 0.98 recommended) or with non-realistic load (genetted generation, very low power factor, Only-Q loads,...). You can test your CLODAL model on the 'savnw.sav' case (located in the example folder of the PSSe installation directory).