"we have planned" is correct and usable in written English. You can use it to describe an action that has already been thought out. For example, "We have planned to start renovations on the house next week.".
We have planned quite a lot.
This is an anomaly we have planned for".
"We have planned new contacts at various levels for the coming period," he said.
It's normally en route to what we have planned for the day.
"We have enough plans.
"We have planning permission for an extension.
We had planned to eat there.
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Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu