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Mid-long term hydro-thermal optimal dispatching plays an important role in mid-long term electric power and energy balance, and it also can bring significant economic benefits. This topic has been discussed in many literatures and some progress has been achieved, but there are still two problems that need to be solved. First, the modeling approach needs to be improved. When a multi-scenario model is adopted in hydro-thermal optimal dispatching, the existing modeling approaches will probably suffer from the dimensionality problem. Second, the construction of the mathematical model is not comprehensive. Generally, the existing model only considers the power balance;