Power system scheduling method for improving utilization rate of clean energy

Abstract

The invention discloses a power system scheduling method for improving the utilization rate of clean energy, and the method comprises the following steps: dividing loads into fixed loads and schedulable loads; obtaining a wind power generation prediction curve of each wind power plant, a photovoltaic power generation prediction curve of each photovoltaic power station and a nuclear power output plan of each nuclear power station; obtaining a fixed load energy consumption prediction curve of the dispatching center; obtaining a comprehensive energy consumption curve, wherein the comprehensive energy consumption curve is a difference value between the fixed load energy consumption prediction curve and the wind power generation prediction curve, the photovoltaic power generation prediction curve and the nuclear power output plan; the dispatching center preferentially meets the power consumption demand of the comprehensive energy consumption curve and then meets the power consumption demand of the schedulable load, so that the maximum clean energy utilization rate is realized; the effect of improving the wind power utilization rate of the energy storage system is fully exerted, the clean energy utilization rate is effectively improved, and the wind curtailment and light curtailment phenomena are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system dispatching and control, and in particular relates to a power system dispatching method for improving the utilization rate of clean energy. Background Art

[0002] With the growth of global energy demand and the emphasis on environmental protection, clean energy has developed rapidly and the scale of installed capacity has continued to expand. In countries such as China, the proportion of clean energy installed capacity in the power system has gradually increased. However, wind and solar energy resources have significant intermittent and volatile characteristics, and output power is difficult to accurately predict and control. This has brought great challenges to the stable operation of the power grid after wind power and photovoltaic power are connected to the power system.

[0003] Traditional power systems mainly rely on highly controllable power generation methods such as thermal power and hydropower. These power sources can flexibly adjust output power according to power demand to ensure the stability of the power grid. However, in the face of the randomness and uncertainty of wind power and photovoltaics, traditional scheduling methods are difficult to deal with effectively. In existing technologies, the scheduling of wind power, photovoltaics and energy storage systems is usually carried out separately, or the synergistic effects of wind power, photovoltaics and energy storage systems are ignored during the optimization process, resulting in low system operation efficiency and failure to give full play to the role of energy storage systems in improving wind power utilization. Some scheduling methods may adopt relatively simple scheduling strategies, such as fixed ratio scheduling or experience-based scheduling, which are difficult to adapt to the complex changes in clean energy output and the diversified needs of the power grid, and cannot maximize the utilization of clean energy, which directly leads to serious wind and solar abandonment in some areas, resulting in energy waste. Therefore, improving the utilization rate of clean energy and reducing wind and solar abandonment have become urgent issues to be solved in the development of clean energy. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a power system dispatching method for improving the utilization rate of clean energy, thereby solving the problem of low clean energy utilization rate caused by traditional dispatching methods.

[0005] The present invention adopts the following technical solutions to realize the present invention:

[0006] A method for dispatching a power system to improve the utilization rate of clean energy comprises the following steps:

[0007] Divide the load into fixed load and dispatchable load;

[0008] Obtain the wind power generation forecast curve of each wind farm, the photovoltaic power generation forecast curve of each photovoltaic power station, and the nuclear power output plan of each nuclear power station; and obtain the fixed load energy consumption forecast curve of the dispatching center;

[0009] Obtain the comprehensive energy consumption curve, which is the difference between the fixed-load energy consumption prediction curve and the wind power generation prediction curve, photovoltaic power generation prediction curve, and nuclear power output plan, as shown in Equation (1):

[0010] p ZH = p FH - p FD - p GF - p HD (1)

[0011] In the formula, P ZH is the comprehensive energy consumption curve; P FH is the fixed-load energy consumption curve prediction curve; P FD is the wind power generation curve; P GF is the photovoltaic power generation prediction curve; P HD is the nuclear power output plan;

[0012] The dispatching center preferentially satisfies the electricity demand of the comprehensive energy consumption curve and then satisfies the electricity demand of the dispatchable load, so as to maximize the utilization rate of clean energy.

[0013] Furthermore, when the dispatching center preferentially satisfies the electricity demand of the comprehensive energy consumption curve and then satisfies the electricity demand of the dispatchable load, first, arrange hydropower to fill the electricity demand; second, arrange thermal power to fill the electricity demand; finally, only when the grid regulation capacity is insufficient, put into energy storage equipment; if the grid still cannot achieve source-load balance after the energy storage operates at full load, adjust the dispatchable load for peak shaving and valley filling.

[0014] Furthermore, the fixed load is the load that does not participate in the demand response of the provincial power grid.

[0015] Furthermore, the dispatchable load is the load that participates in the demand response of the provincial power grid.

[0016] The beneficial technical effects of the present invention are as follows:

[0017] The present invention overcomes the problem that the traditional dispatching method is difficult to effectively respond to the randomness and uncertainty of wind power and photovoltaic power, changes the situation of low operating efficiency caused by separate dispatching of wind power, photovoltaic power, and energy storage systems or ignoring the synergistic effect, abandons the simple dispatching strategy, can better adapt to the complex changes in the output of clean energy and the diverse demands of the power grid, gives full play to the role of the energy storage system in improving the utilization rate of wind power, effectively improves the utilization rate of clean energy, and reduces the phenomena of wind abandonment and light abandonment. Description of the Drawings

[0018] Figure 1 Schematic flow chart of the power system dispatching method for improving the utilization rate of clean energy provided by the embodiment of the present invention. Detailed Embodiments

[0019] The present invention discloses a power system scheduling method for improving the utilization rate of clean energy, comprising the following steps:

[0020] Divide the load into fixed load and schedulable load;

[0021] Obtain the wind power generation prediction curve of each wind farm, the photovoltaic power generation prediction curve of each photovoltaic power station, and the nuclear power output plan of each nuclear power plant; and obtain the fixed load energy consumption prediction curve of the dispatching center;

[0022] Obtain the comprehensive energy consumption curve, which is the difference between the fixed load energy consumption prediction curve and the wind power generation prediction curve, the photovoltaic power generation prediction curve, and the nuclear power output plan, as shown in Equation (1):

[0023] p ZH =p FH -p FD -p GF -p HD (1)

[0024] In the formula, P ZH is the comprehensive energy consumption curve; P FH is the fixed load energy consumption curve prediction curve; P FD is the wind power generation curve; P GF is the photovoltaic power generation prediction curve; P HD is the nuclear power output plan;

[0025] The dispatching center gives priority to meeting the electricity demand of the comprehensive energy consumption curve, and then meets the electricity demand of the schedulable load, so as to maximize the utilization rate of clean energy.

[0026] When the dispatching center gives priority to meeting the electricity demand of the comprehensive energy consumption curve and then meets the electricity demand of the schedulable load, first, considering that hydropower is a renewable energy source, hydropower is preferentially arranged to fill the electricity demand; second, considering that thermal power has strong regulation ability, thermal power is further arranged to fill the electricity demand; finally, considering that the energy storage capacity is limited, the energy storage device is only put into use when the grid regulation ability is insufficient; if the grid still cannot achieve source-load balance after the energy storage operates at full load, the schedulable load is adjusted for peak shaving and valley filling, as shown in Equation (2):

[0027] p S +p H +p C -p D =p ZH (2).

[0028] In the formula, p S is the hydropower generation curve; p H is the thermal power generation curve; p C is the energy storage curve; p DIt is the energy consumption curve for dispatchable loads.

[0029] It should be noted that according to whether the load participates in the demand response of the provincial power grid, the loads are divided into two categories; the first category is the load that does not participate in the demand response, marked as fixed load; the second category is the load that participates in the demand response, marked as dispatchable load.

[0030] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for dispatching a power system to improve the utilization rate of clean energy, characterized in that: The steps include: Divide the load into fixed load and dispatchable load; Obtain the wind power generation forecast curve of each wind farm, the photovoltaic power generation forecast curve of each photovoltaic power station, and the nuclear power output plan of each nuclear power station; and obtain the fixed load energy consumption forecast curve of the dispatching center; Obtain the comprehensive energy consumption curve, which is the difference between the fixed load energy consumption forecast curve and the wind power generation forecast curve, photovoltaic power generation forecast curve, and nuclear power output plan, as shown in formula (1): p ZH =p FH -p FD -p GF -p HD (1) Where P ZH is the comprehensive energy consumption curve; P FH is the fixed load energy consumption curve prediction curve; P FD is the wind power generation curve; P GF is the photovoltaic power generation prediction curve; P HD Contribute to the nuclear power plan; The dispatching center gives priority to meeting the electricity demand of the comprehensive energy consumption curve, and secondly meets the electricity demand of the dispatchable load, so as to maximize the utilization of clean energy.

2. The method for dispatching a power system for improving the utilization rate of clean energy according to claim 1, characterized in that: When the dispatching center gives priority to meeting the electricity demand of the comprehensive energy consumption curve and then meets the electricity demand of the dispatchable load, it first arranges hydropower to fill the electricity demand; secondly, it arranges thermal power to fill the electricity demand; finally, it only puts energy storage equipment into use when the grid regulation capacity is insufficient; if the grid still cannot achieve source-load balance after the energy storage is running at full load, the dispatchable load will be adjusted to smooth the peak and fill the valley.

3. The method for dispatching a power system for improving the utilization rate of clean energy according to claim 1, characterized in that: The fixed load is a load that does not participate in the demand response of the provincial power grid.

4. The method for dispatching a power system for improving the utilization rate of clean energy according to claim 1, characterized in that: The dispatchable load is the load that participates in the demand response of the provincial power grid.

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