大规模跨区特高压直流水电网省两级协调优化方法

在大电网平台下,如何利用受端电网间负荷差异与多电源发电特性来消纳区外水电及缓解受端电网的调峰压力,是中国大规模跨区直流水电输送的关键问题之一。文中以华东电网为背景,从实际应用需求出发,提出了按需供给、多电源互补的大规模跨区特高压直流水电网省两级协调电力控制和电量控制优化调度模型。华东电网2013年典型日模拟调度结果表明,与目前采用的经验调度方法相比,电力控制与电量控制模型下华东电网各省(市)电网负荷平均调峰率分别提高了21.3%和39.3%,调峰效果非常显著;此外,对华东电网2013年全年采用电力控制模型进行日96点试调度运行,结果表明全年平均调峰率提高了20.5%,充分显示了优化水电输送与分配方式的巨大潜力。

Coordination and Optimization Methods for Large-scale Trans-regional Hydropower Transmission via UHVDC in Regional and Provincial Power Grids

Under the large-scale power grid platform, one of the key issues of large-scale trans-regional hydropower transmission via ultra-high voltage direct current (UHVDC) is how to fully utilize the load differences of receiving power grids and the generation characteristics of multiple power sources to accommodate external hydropower and mitigate pressures on peak shaving load. Against the background of East China power grid (ECPG) and proceeding from demand on practical application, this paper proposes two coordinated and optimized dispatching models (the power-control model and the energy-control model) for large-scale trans-regional hydropower transmission via UHVDC in regional and provincial power grids. In the two dispatching models, power is supplied according to demand with the multiple power sources supplementing each other. The simulation scheduling results from ECPG on a typical day in 2013 show that, compared with the present empirical scheduling, the average peak shaving ratio of various provincial and municipal power grids with the power-control model and the energy-control model is improved by 21.3% and 39.3%, respectively. The effect of peak shaving is very significant. Moreover, the daily 96-point test using the power-control model is carried out in ECPG in the whole year of 2013. The results show that the annual average peak shaving ratio is improved by 20.5%, fully demonstrating the immense potential of optimal hydropower transmission and allocation.