Research on Wind and PV Power Consumption Strategy Considering Limited Flexible Regulation of Transmitted Bundling Power on Tie-Line

Abstract

There are many “west-to-east” electricity transmission lines in China, some of which transmit bundling power among which including wind and photovoltaic (PV) power. On one hand, according to the interconnected power systems theory, the transmitted power on trans-regional tie-lines needs to keep relatively stable. Therefore, wind turbines and PV facilities have to be bundled with other controllable units, e.g., thermal units. On the other hand, the ratio of wind and PV electricity on tie-lines can be improved by making full use of flexible regulation strategy. With which, the transmitted power can be adjusted along with the day-ahead forecast results of wind energy and solar radiation intensity in some degree. Some work was done on the day-ahead limited flexible regulation. Firstly, the operation rules of the interconnected power systems were introduced, and the principle of how to improve the ratio of wind and PV electricity was explained. Then, considering the consumption and power supply economics of renewable electricity, an optimization model was established and the solving method was proposed. Finally, case studies were conducted. The variations of transmitted power curves under different focuses were analysed. The effectiveness of the proposed regulation strategy was confirmed.