Research on Source-Load Coordination Improving the Flexibility of Power System with High Proportional Wind Power

Due to the character of renewability and the advantages in environmental protection, the proportions of wind power and other renewable energy sources in the power grid of many countries are progressively increased. To some extent, the consumption degree of wind power is actually determined by the flexibility of the whole power system. In this context, we propose a coordinated flexibility improving method from both the source and load sides of smart grid. On the power supply side, thermal units can reduce the outputs at load valley period through two-stage deep peak regulation. Besides, the penetration rate of electric vehicles (EVs) is also increasing rapidly all over the world. Therefore, on the load side, EV drivers can participate in the flexibility optimization process of the system through two types of demand response (DR), flexible electricity prices and day-ahead contracts. Finally, various cases are simulated in the improved IEEE 30 bus system, and the results show that the proposed method can effectively improve the system's renewable energy accommodation capability, thus improving the overall flexibility of the system, while bring benefits to EV owners.