基于分时电价的风电-光伏-光热联合发电基地并网优化调度策略

针对风电、光伏出力的随机性、间歇性和波动性导致其在大规模接入电网时对电网发电计划制定及其调度产生的影响,提出一种基于分时电价的风电-光伏-光热联合发电基地并网优化调度策略。利用含储热光热电站良好的可调度性与可控性,将风电和光伏出力进行时空平移,使风电-光伏-光热联合出力转变为稳定且可调度的电源,且具备削峰填谷功能,与火电机组共同参与电网调度。为提高风电-光伏-光热系统并网经济效益,实现火电机组经济平稳运行,建立了风电-光伏-光热联合发电基地并网优化调度模型,包含风电-光伏-光热系统联合“削峰”模型和火电机组经济调度模型,分别对应第一阶段优化和第二阶段优化,采用智能算法对其进行求解。最后通过改进的IEEE-30节点算例系统仿真验证所提调度策略的正确性和有效性。

Grid-connected Optimal Dispatching Strategy for Wind-photovoltaic-concentrating Solar Power Combined Power Generation Base Based on Time-of-use Electricity Price

The output of wind and photovoltaic(PV) power possess randomness, intermittence and volatility, which ca-uses influences on the power generation planning and dispatching of power grid when they are connected to power grid at a large scale. To solve this problem, a grid-connected optimal dispatching strategy for a wind-PV-concentrating solar power (CSP) combined power generation base is proposed, which is based on the time-of-use electricity price. By means of the satisfying schedulability and controllability of the CSP with thermal storage, the output of wind and PV power is transferred in time and space, so the combined output of wind-PV-CSP can be converted into a stable and schedulable power supply with peak shaving, which makes it participate in the dispatching of power grid with thermal power units. To increase the grid-connected economic benefits of the wind-PV-CSP system and achieve the smooth economic operation of thermal power units, the grid-connected optimal dispatching model for the wind-PV-CSP combined power generation base is built, which includes the wind-PV-CSP system combined with the "peak shaving" model and with the economic dispatching model of thermal power units, corresponding to the first- and second-stage optimization, respectively. In addition, these models are further solved using the intelligent algorithm. Finally, the feasibility and correctness of the proposed dispatching strategy is simulated and verified by an improved IEEE 30-node example system.