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Firstly, changing Voltage set point doesn't change generator's Qmax, but Qgen. Secondly, there are many ways to control reactive power. You could try some of them:

1. Optimal power flow
2. Implementing of compensators (fixed shunt, SVC...)
3. Changing parametters manually. In your case, I suggest to raise Vset of not only one generators, but all generator in the surrounding area.

Firstly, changing Voltage set point doesn't change generator's Qmax, but Qgen. Secondly, there are many ways to control reactive power. You could try some of them:

1. Optimal power flow
2. Implementing of compensators (fixed shunt, SVC...)
3. Changing parametters manually. In your case, I suggest to raise Vset of not only one generators, generator, but all generator generators in the surrounding area.