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In order to maximize the profit of a combined cycle power plant, it is important to accurately predict its full load power output. When a combined cycle power plant operates, the exhaust gas produced by the previous stage is used to drive the next stage heat engine to drive the generator, and its full-load electrical output is affected by ambient temperature, atmospheric pressure, relative humidity and exhaust pressure. Firstly, the kernel principle component analysis (KPCA) was used to perform feature combination dimensionality reduction for power generation related features to complete feature extraction. Then, the extreme gradient boosting algorithm (XGBoost) was used to score feature importance and the optimal feature subset was obtained by forward selection (FS). Finally, a KPCA-XGB-FS model was constructed for the prediction of hourly power output under full load of combined cycle power plants. By experimenting with real data from a combined power station and comparing with existing research methods using the same data, it is found that the method proposed in this paper can effectively predict the power output, and is better than the existing research methods.

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