Table1_A multi-objective optimization model for the coordinated operation of hydropower and renewable energy.DOCX

The rapid growth of wind and solar energy sources in recent years has brought challenges to power systems. One challenge is surging wind and solar electric generation, understanding how to consume such generation is important. Achieving the complementarity of hydropower and renewable energies such as wind and solar power by utilizing the flexible regulation performance of hydropower is helpful to provide firm power to help renewable energy consumption. However, the multi-energy complementary operation mode will change the traditional hydropower operation mode, causing challenges to the comprehensive utilization of hydropower. In this paper, a multi-objective optimal scheduling model is built by considering coordinated hydro-wind-solar system peak shaving and downstream navigation. First, the Gaussian mixture model is adopted to quantify the uncertainty of wind and solar power. Then, a hydro-wind-solar coordinated model was built to obtain the standard deviation of the residual load and the standard deviation of the downstream water level. Finally, the ε-constraint method is used to solve for the Pareto optimality. The results demonstrate the following: 1) The proposed model can effectively determine hydropower output schemes that can coordinate wind and solar power output to reconcile peak shaving and navigation; 2) The downstream hydropower stations’ reverse regulation of the upstream hydropower station is a positive factor in reconciling conflicts; and 3) Reasonable planning of wind power and solar power is helpful for hydro-wind solar power complement operation.

近年来，风能和太阳能等可再生能源的迅猛发展给电力系统带来了诸多挑战。其中之一便是风能和太阳能发电的波动性激增，了解如何有效利用这种发电方式显得尤为重要。通过利用水能的灵活调节性能，实现水电与风能、太阳能等可再生能源的互补性，有助于提供稳定的电力以促进可再生能源的消纳。然而，多能源互补运行模式将对传统水电运行模式产生变革，从而对水电的综合利用带来挑战。在本文中，通过综合考虑协调式水风太阳能系统削峰填谷及下游航道航行，构建了一个多目标优化调度模型。首先，采用高斯混合模型对风能和太阳能的波动性进行量化。随后，构建了水风太阳能协调模型，以获得剩余负荷的标准差和下游水位标准差。最后，运用ε约束法求解Pareto最优解。研究结果表明：1）所提模型能够有效确定水电出力方案，以协调风能和太阳能出力，实现削峰填谷与航道航行之间的平衡；2）下游水电站在上游水电站的反调节作用是解决冲突的积极因素；3）对风能和太阳能的合理规划有助于实现水电、风能、太阳能的互补运行。