A novel metric for evaluating hydro-wind-solar energy
Thanks to the regulation ability of hydropower and the complementarity between hydro–wind–solar multiple energy, the complementary operation of VREs with hydropower
Currently, many wind farms and solar arrays are under construction in Southwest China, and the penetration of intermittent renewable energy is growing rapidly. The operating characteristics of the integrated hydro–wind–PV system may present changes for various sizes of wind and PV plants.
Building on the autoregressive moving average (ARMA) model and improved vine-copula theory, a joint distribution model for wind and PV power is built with measured data to capture the spatial and temporal correlations between wind and solar plants, and sufficiently representative scenarios for renewable energy generation are explored.
Utilizing the clustering outcomes, we computed the complementary coefficient R between the wind speed of wind power stations and the radiation of photovoltaic stations, resulting in the following complementary coefficient matrix (Fig. 17.).
Furthermore, electric power generation from the wind and PV plants can support the hydropower stations in the dry season. For this reason, hydro–wind–solar hybrid systems are suitable for the renewable-energy bases being established along the cascade reservoirs in Southwest China to satisfy the rising demand for power transmission. Table 2.
The results corroborate the direct analysis of joint probability density distributions, indicating a gradual strengthening of wind speed-radiation complementarities in Qinghai province from hourly to monthly scales, with no evident complementary characteristic of wind speed-radiation in Gansu province. Table 2.
Analysis of the matrix reveals that the 4th, 5th, 7th, and 8th clusters of wind power stations exhibit the weakest complementarity with the radiation of photovoltaic stations. In contrast, the 5th, 7th, 8th, and 10th clusters of photovoltaic stations similarly demonstrate poor complementarity with the wind speed of wind power stations.

Thanks to the regulation ability of hydropower and the complementarity between hydro–wind–solar multiple energy, the complementary operation of VREs with hydropower
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