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Machine angular instability can be avoided by lowering its power output. Assuming all other models are OK, reduce system load such that steady state power output of such machine is reduced below its output value leading to instability. Check and re-balance power output of all machines in study region to avoid having extremes in machine's mw output (one unit producing too much mw v. another producing too little).

Before executing a dynamic run, the steady state case shall be solved and converged to acceptable operating conditions. It is also good to check that ERUN and GRUN for all machines produce acceptable results. In some cases, lowering the 'integrating' step size can help if some models requires so (normally set to 1/4 of a cycle). In other cases, lowering the 'acceleration' factor would help (from default 1.0 to 0.6 or lower).