CN-121216525-B - Method, device, system and storage medium for scheduling hybrid pumped storage power station

CN121216525BCN 121216525 BCN121216525 BCN 121216525BCN-121216525-B

Abstract

The application relates to a scheduling method, a device, a system and a storage medium of a hybrid pumped storage power station, which relate to the technical field of power system scheduling and at least solve the problem that the peak-valley difference of residual load cannot be effectively reduced because the flexible adjustment capability of the hybrid pumped storage power station cannot be accurately quantized, so that the output state of each unit in the power station cannot be accurately scheduled. The method comprises the steps of constructing a scheduling model according to residual loads of all preset time periods in a target scheduling period and overall flexible adjustment capacity of a hybrid pumped storage power station, determining a first output range of each hydroelectric generating set and a second output range of each pumped storage unit according to first constraint and second constraint, coupling the first output range with the second output range, solving the scheduling model to obtain target operating power of the pumped storage unit, and scheduling operating conditions of all the hydroelectric generating sets and all the pumped storage units according to the target operating power.

Inventors

YAO YINGBEI
ZHANG JIANPING

Assignees

国家电网有限公司华东分部

Dates

Publication Date: 20260505
Application Date: 20250903

Claims (10)

1. The scheduling method of the hybrid pumped storage power station is characterized by being applied to the hybrid pumped storage power station, wherein the hybrid pumped storage power station is a power station built by additionally arranging pumped storage units on a cascade hydropower station structure, the hybrid pumped storage power station comprises a plurality of hydropower units and a plurality of pumped storage units, and the method comprises the following steps: Constructing a scheduling model according to the residual load of each preset period in a target scheduling period and the overall flexible scheduling capability of the hybrid pumped storage power station, wherein the scheduling model aims at the minimum residual load variance and the maximum flexible scheduling capability in the target scheduling period; Determining a first output range of each hydroelectric generating set and a second output range of each pumped storage set according to a first constraint and a second constraint, wherein the first constraint represents constraint conditions of a cascade hydroelectric power station and the hydroelectric generating set; Coupling the first output range and the second output range, and solving the scheduling model to obtain target operating power of the pumping and accumulating unit, wherein the target operating power comprises power generation power and pumping power; And scheduling the operation working conditions of each hydroelectric generating set and each pumped storage set according to the target operation power.
2. The hybrid pumped-storage power plant scheduling method of claim 1, wherein the overall flexible regulation capability comprises an overall flexible regulation capability and an overall downregulation flexible regulation capability; The method comprises the steps of quantifying the overall flexible regulation capacity of the hybrid pumped-storage power station before constructing a scheduling model according to the residual load of each preset period in a target scheduling period and the overall flexible regulation capacity of the hybrid pumped-storage power station, wherein the method specifically comprises the following steps: Determining a first up-regulation flexible regulation capacity of the hydroelectric generating set according to the up-regulation rate of the cascade hydroelectric generating station and the maximum output of each hydroelectric generating set, and determining a first down-regulation flexible regulation capacity of the hydroelectric generating set according to the down-regulation rate of the cascade hydroelectric generating station and the minimum output of each hydroelectric generating set; determining a second up-regulation flexible regulation capacity of the pumped-storage unit according to the up-regulation rate under the power generation working condition of the mixed pumped-storage power station, the up-regulation rate under the pumping working condition, the minimum output under the pumping working condition and the unit capacity; Determining the overall tuning flexible tuning capacity based on the first tuning flexible tuning capacity and the second tuning flexible tuning capacity; and determining the overall turndown flexible adjustment capability based on the first turndown flexible adjustment capability and the second turndown flexible adjustment capability.
3. The hybrid pumped-storage power station scheduling method according to claim 2, wherein the constructing a scheduling model according to the residual load of each preset period in the target scheduling period and the overall flexible scheduling capability of the hybrid pumped-storage power station comprises: Determining a first objective function according to the sum of the overall upward flexible adjustment capability and the overall downward flexible adjustment capability of each preset period; determining a second objective function according to the difference value between the residual load of each preset period and the average value of the residual load in the target scheduling period, wherein the second objective function is used for determining the minimum residual load variance; determining the priority of the first objective function and the second objective function according to a preset weight coefficient; combining the first objective function and the second objective function by using a weighted combination method according to the priority to obtain an objective function set; And constructing the scheduling model according to the objective function set.
4. The method of claim 1, wherein the first constraint comprises a first water balance constraint, a first reservoir capacity constraint, a water purification head constraint, a first generated current amount constraint, and a hydroelectric generating set start-stop constraint; the determining a first output range of each of the hydro-power units and a second output range of each of the pumped-storage units according to a first constraint and a second constraint comprises: According to the first constraint of the cascade hydropower station and the hydropower units, a convex hull relaxation method is utilized to solve the nonlinear relation between the water purifying head and the first generating amount, and the first output range of each hydropower unit is obtained.
5. The hybrid pumped-storage power station scheduling method of claim 4, wherein the second constraint comprises a second water balance constraint, a second power generation flow constraint, a pumping flow constraint, the water purification head constraint, a pumping storage unit start-stop constraint, and wherein the second output range comprises a second power generation output range and a second pumping output range; the determining a first output range of each of the hydro-power units and a second output range of each of the pumped-storage units according to a first constraint and a second constraint comprises: according to the second constraint, a nonlinear relation between the water purifying head and the second power generation flow under the power generation working condition of the pumped storage unit is solved by utilizing a convex hull relaxation method, the second power generation output range under the power generation working condition of each pumped storage unit is obtained, and the nonlinear relation between the water purifying head and the water pumping flow under the water pumping working condition of the pumped storage unit is solved, so that the second water pumping output range under the water pumping working condition of each pumped storage unit is obtained.
6. The hybrid pumped-storage power station scheduling method of claim 5, wherein the residual load is a difference between an original load and a predicted output of photovoltaic and wind power and an operating power of the pumping and storage unit; The step of coupling the first output range and the second output range, and solving the scheduling model to obtain the target operating power of the pumping and accumulating unit, includes: Solving the scheduling model according to the first output range and the second output range to obtain a target residual load; and determining the target operating power of the pumping and accumulating unit according to the target residual load, the original load and the predicted output force of the photovoltaic and wind power.
7. The hybrid pumped-storage power plant scheduling method of claim 6, wherein said scheduling the operation of each of said hydro-power units and each of said pumped-storage units based on said target operation power comprises: Determining the output values of the hydroelectric generating sets and the pumped storage sets according to the target operating power; And respectively scheduling the operation working conditions of each hydroelectric generating set to be in a starting or stopping state according to the output values, and respectively scheduling the operation working conditions of each pumped storage set to be in a discharging working condition, a pumping working condition or a stopping state.
8. A hybrid pumped storage power station scheduling apparatus, the apparatus comprising: The system comprises a scheduling model construction unit, a scheduling model generation unit and a control unit, wherein the scheduling model construction unit is configured to construct a scheduling model according to the residual load of each preset period in a target scheduling period and the overall flexible regulation capability of the hybrid pumped storage power station, and the scheduling model is aimed at the minimum residual load variance and the maximum flexible regulation capability in the target scheduling period; The system comprises a dispatching model, a solving unit, a first output range, a second output range, a first control unit, a second control unit and a control unit, wherein the solving unit is configured to determine a first output range of a hydroelectric generating set and a second output range of a pumped storage set according to a first constraint and a second constraint; And the scheduling unit is configured to schedule the operation working conditions of each hydroelectric generating set and each pumped storage unit according to the target operation power.
9. The hybrid pumped storage power station is characterized by comprising a plurality of hydroelectric sets and a plurality of pumped storage sets; is configured to perform the hybrid pumped-storage power station scheduling method of any one of claims 1-7.
10. A computer readable storage medium having instructions stored thereon, which, when executed by a processor of a hybrid pumped-storage power plant scheduling apparatus, enable the hybrid pumped-storage power plant scheduling apparatus to perform the hybrid pumped-storage power plant scheduling method of any one of claims 1-7.

Description

Method, device, system and storage medium for scheduling hybrid pumped storage power station Technical Field The application relates to the technical field of power system dispatching, in particular to a dispatching method, a device, a system and a storage medium for a hybrid pumped storage power station. Background The development of renewable energy sources such as wind power, photovoltaics and the like is a key measure for coping with increasingly severe climate change and energy crisis. However, because the output has strong intermittence and fluctuation, the large-scale grid connection of wind power and photovoltaic has serious influence on the safe and efficient operation of the power grid. By means of the adjusting capability of other flexible power supplies, fluctuation of wind power and photovoltaic output is stabilized, and therefore the proportion of the wind power and photovoltaic output in the power grid is improved. The flexible regulation capability is the capability of rapidly and flexibly regulating the increase or decrease of the power generation output according to the power grid demand, and is mainly limited by the conditions of reservoir capacity, water flow time lag and the like, so that rapid and accurate global optimal response cannot be realized. The pumped storage Power Station (PS) is used as a typical flexible regulating power supply and plays an important role in the construction of a novel power system. However, the alternative site resources of conventional pumped-storage power plants have been increasingly exhausted. In recent years, a pumping and accumulating unit is additionally arranged between two hydropower stations, namely, a mixed pumped storage hydropower station (HPSHPP) is constructed on the basis of a Cascade Hydropower Station (CHPs), so that the pumping and accumulating hydropower station becomes an effective mode for improving the flexible regulating capability of a system, but the conventional regulating capability estimation mode only depends on the upper and lower limits of the output of each unit in the hydropower station, so that the flexible regulating capability of the mixed pumped storage hydropower station is difficult to accurately quantify, the load fluctuation of a power grid cannot be effectively improved and stabilized, and the peak-valley difference of the residual load of a power generation system is reduced. Disclosure of Invention The invention provides a scheduling method, a device, a system and a storage medium of a hybrid pumped storage power station, which at least solve the problem that the peak-valley difference of residual load cannot be effectively reduced because the flexible adjustment capability of the hybrid pumped storage power station cannot be accurately quantized, so that the output state of each unit in the power station cannot be accurately scheduled. The technical scheme of the invention is as follows: According to a first aspect of an embodiment of the invention, a mixed pumped storage power station scheduling method is provided, the mixed pumped storage power station is applied to a mixed pumped storage power station, the mixed pumped storage power station is a power station built by adding pumped storage units on the basis of a cascade hydropower station structure, the mixed pumped storage power station comprises a plurality of hydropower stations and a plurality of pumped storage units, a scheduling model is built according to residual load of each preset period in a target scheduling period and overall flexible scheduling capability of the mixed pumped storage power station, the scheduling model aims at the minimum residual load variance and the maximum flexible scheduling capability in the target scheduling period, a first output range of each hydropower station and a second output range of each pumped storage unit are determined according to first constraint and second constraint, the first constraint represents constraint conditions of the cascade hydropower station and the hydropower stations, the second constraint conditions of the mixed pumped storage power station and the pumped storage units are represented, the first output ranges and the second output ranges are coupled, the scheduling model is solved to obtain target running power of the pumped storage units, the target running power comprises generating power and the pumped storage power, and the running condition of each pumped storage unit is scheduled according to the target running power. As one implementation, the overall compliance adjustment capability includes a global compliance adjustment capability and a global downregulation compliance adjustment capability. The method specifically comprises the steps of determining first up-regulation flexible capacity of the hydroelectric generating set according to up-regulation rate of the cascade hydroelectric generating station and maximum output of each hydroelectric generating set, determining first down-r