Pumped storage unit power generation power control method for stabilizing photovoltaic output fluctuation

Abstract

The invention relates to a pumped storage unit power generation power control method for stabilizing photovoltaic output fluctuation. The pumped storage unit power generation power control method usedfor controlling a pumped storage unit to generate power and stabilizing photovoltaic output fluctuation comprises the following steps: step 1, obtaining the frequency of a provincial power grid and power operation data of an external connecting line, and calculating regional control deviation reflecting the active power control requirement of the provincial power grid; 2, establishing a control constraint of the pumped storage unit; and 3, superposing the photovoltaic fluctuation power on the region control deviation to obtain a corrected region control deviation, taking the corrected regioncontrol deviation as an active power control target of the pumped storage unit, considering a starting threshold of the pumped storage unit, and controlling the pumped storage unit under the control constraint. According to the invention, the photovoltaic output fluctuation can be well stabilized, and the daily operation pressure of scheduling personnel is reduced, so that the operation efficiencyof the power grid is improved, and the safe and stable operation capability of the power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of automatic power generation control of electric power systems, and in particular relates to a method for controlling the power generation of a pumped storage unit for smoothing photovoltaic output fluctuations. Background technique [0002] Wind energy, water energy, solar energy, etc. are renewable energy, and a high proportion of renewable energy grid-connected has become the development direction of the power system. However, photovoltaic power generation has strong randomness, volatility and intermittency, and large-scale wind power and photovoltaic grid integration make the safe and stable operation of the power system face severe challenges. As a power source with large scale and good regulation performance, the pumped storage unit can effectively stabilize the fluctuation of wind power generation and photovoltaic power generation, and improve the power grid's ability to absorb it. Therefore, it is ...

AI Technical Summary

Problems solved by technology

[0003] For the control of the hydro-complementary power generation system, the existing research focuses on coordinating the timing of the day-ahead and intraday power generation plans with the AGC units. Generators can participate in the real-time balance control of daily active power. Some power grids use remote control commands to start and stop after a fault, and cannot accurately calculate the adjustment amount of the generator set, which may easily lead to overshoot or undershoot; the manual recovery process resumes when there are a large number of generator sets Efficiency is reduced, because pumped storage units generally have a large installed capacity, which may generate new active power impacts on the grid

[0004] To sum up, the existing research lacks related methods for using pumped storage units to stabilize photovoltaic output fluctuations.

Images