Cascade hydropower station load change real-time adaptive method based on consideration of daily electric quantity deviation

Abstract

The invention belongs to the field of hydropower station optimal scheduling, and relates to a cascade hydropower station load change real-time adaptive method based on consideration of daily electricquantity deviation. Due to the fact that deviation exists in power grid load prediction adopted in power grid day-ahead power generation plan making, in order to achieve load balance in actual operation, power generation plans of part of power stations need to be adjusted in real time according to changes of power grid loads. Cascade hydropower stations are usually used as the load balance power stations. According to the method, the output increase and decrease sequence of the cascade power station is determined by adopting three prioritized criteria, namely, the abandoned water reduction rate relative to cascade electric quantity change, the daily electric quantity deviation rate exceeding the limit and the cascade energy storage increase rate relative to cascade electric quantity change, and cascade load increase and decrease in each time period are sequentially distributed according to the sequence. The method can consider the cascade water energy utilization rate and power grid requirements, is more easily accepted by cascade scheduling departments, and is higher in practicability.

Description

technical field [0001] The invention belongs to the field of optimal dispatching of hydropower stations, and relates to a real-time self-adaptive method for cascade hydropower station load changes in consideration of daily power deviation. Background technique [0002] Due to the deviation of the power grid load forecast used in the formulation of the current power generation plan of the power grid, in order to achieve load balance in actual operation, it is necessary to adjust the power generation plan of some power stations in real time according to changes in the power grid load, and cascade hydropower stations are usually used as this type of load balance power station. The way to achieve load balance can be directly issued by the power grid to the real-time plan of the hydropower station or even the unit, or the changed cascade total power generation process curve can also be issued. For the latter case, the cascade total power generation process curve needs to be dist...

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Problems solved by technology

The cumulative result of this effect is that the water level of the reservoir of the hydropower station may seriously deviate from the control target. The end-of-day water level of some power stations is too high, while the end-of-day water level of some power stations is too low. Some hydropower stations lose their backup capacity and bring difficulties to subsequent power generation scheduling.

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