A method and device for optimizing the peak shaving capacity of a thermal power unit in a power system

Abstract

The application relates to a thermal power unit peak regulation capacity optimization method and device of a power system, which comprises the following steps: obtaining a wind power curtailment rate of a region; if the wind power curtailment rate of the region is greater than a preset threshold value of the wind power curtailment rate, solving a pre-established thermal power unit capacity optimization calculation model to obtain a thermal power unit peak regulation capacity adjustment amount of the region participating in peak regulation; and determining an optimized thermal power unit peak regulation capacity according to the sum of an initial peak regulation capacity of the thermal power unit participating in peak regulation and the thermal power unit peak regulation capacity adjustment amount. The technical scheme provided by the application comprehensively considers a wind power curtailment rate control target and the adjustment capacity of a current thermal power unit, realizes flexible optimization of the thermal power unit capacity, and further provides a constructive suggestion for carrying out flexible optimization of the thermal power unit capacity of a power grid.

Claims

1. A method for optimizing the peak-shaving capacity of thermal power units in a power system, characterized in that, The method includes: Obtain the wind power curtailment rate in the region; If the wind power curtailment rate in a region is greater than the preset threshold for wind power curtailment rate, then the pre-established thermal power unit capacity optimization calculation model is solved to obtain the peak-shaving capacity adjustment amount of the thermal power units participating in peak shaving in the region. The optimized peak-shaving capacity of the thermal power units is determined by the sum of the initial peak-shaving capacity of the participating thermal power units and the adjustment amount of the peak-shaving capacity of the participating thermal power units. The wind power curtailment rate of the acquired area includes: Determine the wind power curtailment rate of the region using the following formula : In the formula, , The total number of time periods. In the first t Wind curtailment power during a given time period In the first t Rated wind power capacity within a specific time period; Wherein, determined by the following formula : In the formula, In the first t The power generation capacity of wind power within a certain time period; Determine by the following formula : In the formula, In the first t Wind power absorption capacity within a specific time period; Determine by the following formula : In the formula, In the first t Power consumption of the load within a time period In the first t The sum of the minimum technical output of thermal power units, wind power units and other power generation units within a certain time period; Determine by the following formula : In the formula, , To optimize the total number of time periods, , , , M , N , O These refer to the number of generating units for thermal power plants, hydropower plants, and other power sources, respectively. In the first t Within the time period, the first m The minimum technical output of Taiwan's thermal power units In the first t Within the time period, the first n The minimum technical output of the Taiwan hydroelectric generator unit In the first t Within the time period, the first o The minimum technical output of other power units in Taiwan In the first t Within the time period, the first m Start-up and shutdown status of thermal power units in Taiwan. In the first t Within the time period, the first n Start-up and shutdown status of the hydroelectric power unit. In the first t Within the time period, the first o Start-up and shutdown status of other power units; in, , and The value can be either 0 or 1. When it is 0, it means that the unit is in a stopped state, and when it is 1, it means that the unit is in a powered-on state.

2. The method as described in claim 1, characterized in that, The pre-established thermal power unit capacity optimization calculation model includes: Objective function and constraints of thermal power unit capacity optimization calculation model established with the goal of minimizing total regulating capacity and pollutant emissions of thermal power units; The constraints include: wind power curtailment rate constraints, power load balance constraints, and thermal power unit output constraints. The thermal power units include pure condensing thermal power units and heating thermal power units.

3. The method as described in claim 2, characterized in that, The objective function of the pre-established thermal power unit capacity optimization calculation model is determined by the following formula: In the formula, The target value for the thermal power unit capacity optimization calculation model, This refers to the total regulating capacity of the thermal power unit. This refers to the pollutant emissions from thermal power units. Wherein, determined by the following formula : Determine by the following formula : In the formula, , , This refers to the number of pure condensing thermal power units that need to be adjusted. The number of thermal power units requiring adjustment. For the first i The single-unit capacity of a pure condensing thermal power unit, For the first j The single-unit capacity of the Taiwan-powered thermal power unit, For the first i Peak-shaving pollutant emission coefficient of pure condensing thermal power units in Taiwan For the first j Peak-shaving pollutant emission coefficient of Taiwan's thermal power units. In the first t The number of units participating in peak shaving of pure condensing thermal power units within a certain time period. In the first t The number of thermal power units participating in peak shaving for heating within a given time period. In the first t Within the time period, the first i Peak-shaving capacity of pure condensing thermal power units In the first t Within the time period, the first j Peak-shaving capacity of thermal power units supplying heating in Taiwan.

4. The method as described in claim 2, characterized in that, The constraints for the wind power curtailment rate in the pre-established thermal power unit capacity optimization calculation model are determined by the following formula: In the formula, The preset threshold for wind power curtailment rate, In the first t Wind curtailment power during a given time period In the first t Within the time period, the first i Peak-shaving capacity of pure condensing thermal power units In the first t Within the time period, the first j Peak-shaving capacity of thermal power units supplying heating in Taiwan. In the first t The number of units participating in peak shaving of pure condensing thermal power units within a certain time period. In the first t The number of thermal power units participating in peak shaving for heating within a given time period. In the first t Rated wind power capacity within a specific time period; The power load balance constraints of the pre-established thermal power unit capacity optimization calculation model are determined by the following formula: In the formula, In the first t Within the time period, the first i The power generation output of the Taiwan pure condensing thermal power unit In the first t Within the time period, the first j The power generation output of Taiwan's thermal power units. For the first t Power output of other power sources during a given time period In the first t Wind power generation capacity within a given time period In the first t Power consumption of the load within a time period; The first step of the pre-established thermal power unit capacity optimization calculation model is determined by the following formula. i Power generation output constraints of a pure condensing thermal power unit after adjustment: In the formula, For the first The minimum technical output of a pure condensing thermal power unit. For the first The maximum technical output of the Taiwan pure condensing thermal power unit For the first Peak-shaving capacity adjustment of pure condensing thermal power units; The first step of the pre-established thermal power unit capacity optimization calculation model is determined by the following formula. j Power generation output constraints of Taiwan's thermal power units after adjustment: In the formula, For the first The minimum technical output of Taiwan's thermal power units for heating. For the first The maximum technical output of Taiwan's thermal power units. For the first Peak-shaving capacity adjustment of thermal power units supplying heat and electricity in Taiwan.

5. A device for optimizing the peak-shaving capacity of thermal power units in a power system, characterized in that, The device includes: The acquisition module is used to obtain the wind power curtailment rate of the region; The solution module is used to solve the pre-established thermal power unit capacity optimization calculation model if the wind power curtailment rate in a region is greater than a preset threshold for wind power curtailment rate, and to obtain the peak-shaving capacity adjustment amount of the thermal power units participating in peak shaving in the region. The adjustment module is used to determine the optimized peak-shaving capacity of the thermal power units based on the sum of the initial peak-shaving capacity of the participating thermal power units and the adjustment amount of the peak-shaving capacity of the participating thermal power units. The acquisition module is specifically used for: Determine the wind power curtailment rate of the region using the following formula : In the formula, , The total number of time periods. In the first t Wind curtailment power during a given time period In the first t Rated wind power capacity within a specific time period; Wherein, determined by the following formula : In the formula, In the first t The power generation capacity of wind power within a certain time period; Determine by the following formula : In the formula, In the first t Wind power absorption capacity within a specific time period; Determine by the following formula : In the formula, In the first t Power consumption of the load within a time period In the first t The sum of the minimum technical output of thermal power units, wind power units and other power generation units within a certain time period; Determine by the following formula : In the formula, , To optimize the total number of time periods, , , , M , N , O These refer to the number of generating units for thermal power plants, hydropower plants, and other power sources, respectively. In the first t Within the time period, the first m The minimum technical output of Taiwan's thermal power units In the first t Within the time period, the first n The minimum technical output of the Taiwan hydroelectric power unit In the first t Within the time period, the first o The minimum technical output of other power units in Taiwan In the first t Within the time period, the first m Start-up and shutdown status of Taiwan's thermal power units. In the first t Within the time period, the first n Start-up and shutdown status of the hydroelectric generator unit. In the first t Within the time period, the first o Start-up and shutdown status of other power units; in, , and The value can be either 0 or 1. When it is 0, it means that the unit is in a stopped state, and when it is 1, it means that the unit is in a powered-on state.

6. The apparatus as claimed in claim 5, characterized in that, The pre-established thermal power unit capacity optimization calculation model includes: Objective function and constraints of thermal power unit capacity optimization calculation model established with the goal of minimizing total regulating capacity and pollutant emissions of thermal power units; The constraints include: wind power curtailment rate constraints, power load balance constraints, and thermal power unit output constraints. The thermal power units include pure condensing thermal power units and heating thermal power units.

7. The apparatus as claimed in claim 6, characterized in that, The objective function of the pre-established thermal power unit capacity optimization calculation model is determined by the following formula: In the formula, The target value for the thermal power unit capacity optimization calculation model, This refers to the total regulating capacity of the thermal power unit. This refers to the pollutant emissions from thermal power units. Wherein, determined by the following formula : Determine by the following formula : In the formula, , , This refers to the number of pure condensing thermal power units that need to be adjusted. The number of thermal power units requiring adjustment. For the first i The single-unit capacity of a pure condensing thermal power unit, For the first j The single-unit capacity of the Taiwan-powered thermal power unit, For the first i Peak-shaving pollutant emission coefficient of pure condensing thermal power units in Taiwan For the first j Peak-shaving pollutant emission coefficient of Taiwan's thermal power units. In the first t The number of units participating in peak shaving of pure condensing thermal power units within a certain time period. In the first t The number of thermal power units participating in peak shaving for heating within a given time period. In the first t Within the time period, the first i Peak-shaving capacity of pure condensing thermal power units In the first t Within the time period, the first j Peak-shaving capacity of thermal power units supplying heating in Taiwan.

8. The apparatus as claimed in claim 6, characterized in that, The constraints for the wind power curtailment rate in the pre-established thermal power unit capacity optimization calculation model are determined by the following formula: In the formula, The preset threshold for wind power curtailment rate, In the first t Wind curtailment power during a given time period In the first t Within the time period, the first i Peak-shaving capacity of pure condensing thermal power units In the first t Within the time period, the first j Peak-shaving capacity of thermal power units supplying heating in Taiwan. In the first t The number of condensing thermal power units participating in peak shaving within a given time period. In the first t The number of thermal power units participating in peak shaving for heating within a given time period. In the first t Rated wind power capacity within a specific time period; The power load balance constraints of the pre-established thermal power unit capacity optimization calculation model are determined by the following formula: In the formula, In the first t Within the time period, the first i The power generation output of the Taiwan pure condensing thermal power unit In the first t Within the time period, the first j The power generation output of Taiwan's thermal power units. For the first t Power output of other power sources during a given time period In the first t Wind power generation capacity within a given time period In the first t Power consumption of the load within a time period; The first step of the pre-established thermal power unit capacity optimization calculation model is determined by the following formula. i Power generation output constraints of a pure condensing thermal power unit after adjustment: In the formula, For the first The minimum technical output of a pure condensing thermal power unit. For the first The maximum technical output of a pure condensing thermal power unit in Taiwan For the first Peak-shaving capacity adjustment of pure condensing thermal power units; The first step of the pre-established thermal power unit capacity optimization calculation model is determined by the following formula. j Power generation output constraints of Taiwan's thermal power units after adjustment: In the formula, For the first The minimum technical output of Taiwan's thermal power units for heating. For the first The maximum technical output of Taiwan's thermal power units. For the first Peak-shaving capacity adjustment of thermal power units supplying heat and electricity in Taiwan.

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