Electric power resource comprehensive scheduling and control method based on multistage collaboration

Abstract

The invention relates to the field of electric power resource scheduling, in particular to an electric power resource comprehensive scheduling and control method based on multi-level collaboration, which comprises a fault data acquisition step, a response strategy planning step and an auxiliary response adjusting step, and realizes intelligence and automation of electric power resource scheduling by using a multi-level collaboration electric power scheduling method. The flexibility and regulation efficiency of power resource regulation and control are improved by overall management of electric energy among three levels of power grids and heavy load regulation of primary power transformation equipment by using secondary power transformation equipment, and the power regulation and control strategy of the power transformation equipment with the lowest cost is selected by calculating the aggregation cost value of each secondary power transformation equipment, so that the power regulation and control efficiency of the power transformation equipment is improved. The power regulation and control cost and the electric energy loss are reduced; by using the standby power regulation strategy, the standby power resources of other secondary substations can be quickly responded and called when the secondary substation for regulation and control fails, and the reliability and the flexibility of the power dispatching system are further enhanced.

Description

Technical Field

[0001] The present invention relates to the field of electric power resource dispatching, and in particular to a method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration. Background Art

[0002] In recent years, in the field of power resource dispatching, traditional power dispatching methods often rely on manual judgment and manual operation. This dispatching method is not only inefficient, but also difficult to cope with the complexity and dynamics of large-scale power grids. With the continuous development of power systems and the increasing scale of power grids, the dispatching and management of power resources are facing more and more challenges. Especially in peak periods or sudden failures, how to quickly and accurately dispatch power resources to ensure the stable operation of the power grid and the balance of power supply and demand has become an urgent problem to be solved. Although the existing power dispatching system has achieved automation to a certain extent, it still has many shortcomings. For example, some systems lack flexibility and rapid response capabilities when dealing with power grid failures, which often leads to the spread of faults or untimely handling. In addition, the existing dispatching system often does not fully consider the overall operating efficiency and cost-effectiveness of the power grid in the allocation and dispatching of power resources, resulting in waste of power resources and increased dispatching costs.

[0003] In view of the shortcomings of the existing technology, especially the requirements for intelligent, automated, flexible and reliable power resource dispatching in large-scale power grids, the present invention proposes a method for comprehensive dispatching and control of power resources based on multi-level collaboration. This method realizes the coordinated management of electric energy between the three-level power grids through a multi-level collaborative power dispatching strategy, and improves the flexibility and efficiency of power resource regulation. At the same time, by calculating the aggregated cost value of each secondary substation equipment, the power regulation strategy of the substation with the lowest cost is selected, thereby reducing the power regulation cost and power loss. In addition, the present invention is also provided with a standby power regulation step and a substation mutual assistance strategy, which further enhances the reliability and flexibility of the power dispatching system and improves the system's ability to respond to sudden failures. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for comprehensive dispatching and controlling of electric power resources based on multi-level collaboration.

[0005] To achieve the above object, the present invention provides the following technical solutions: The comprehensive dispatching and control method of electric power resources based on multi-level collaboration includes the following steps: A fault data acquisition step, acquiring substation fault information, and outputting a heavy load adjustment instruction according to the substation fault information; The response strategy planning step includes receiving the heavy load adjustment instruction, setting the primary substation corresponding to the substation fault information as the primary fault device, calculating the total load rate of the primary fault device, and judging whether the secondary substation responds to the adjustment and outputting the auxiliary response adjustment instruction or the standby power adjustment instruction according to the total load rate of the primary fault device and the adjustable power resource amount of the secondary substation under the primary fault device; The auxiliary response adjustment step receives the auxiliary response adjustment instruction, calculates the power generation value and energy storage value of the third-level substation under the second-level substation, and calculates the aggregation cost value, obtains the auxiliary response adjustment power value of the third-level substation according to the aggregation cost value analysis, and aggregates the auxiliary response adjustment power value to the connected second-level substation, obtains the comprehensive dispatch value of power resources through the adjustable power resource amount of the second-level substation and the auxiliary response adjustment power value and inputs it into the first-level fault equipment.

[0006] As a further improvement of the present invention, the response strategy planning step, after determining the first-level fault equipment, calculates the total load rate according to the current load rate of the first-level fault equipment and the predicted load rate change curve, and obtains the adjustable power resources of the subordinate second-level substation. When the adjustable power resources are greater than the total load rate of the first-level fault equipment, the first-level fault equipment outputs an auxiliary response adjustment instruction, and the second-level substation receives the auxiliary response adjustment instruction and enters the auxiliary response adjustment state.

[0007] As a further improvement of the present invention, the power generation value calculation is configured with an equivalent power generation model: ; Among them, G represents the power generation value, Indicates the maximum speed limit of power generation. Indicates the minimum speed limit for power generation. It represents the power generation output power, and G represents the total power generation value within time t when the power generation output power meets the operating range.

[0008] As a further improvement of the present invention, the energy storage value calculation is configured with an equivalent energy storage model: ; Where B represents the energy storage value, represents the energy state of the equivalent energy storage model within time t, Represents the power output of the equivalent energy storage model at time t.

[0009] As a further improvement of the present invention, the aggregation cost value calculation is configured with an aggregation cost model: ; in, represents the aggregate cost value, represents the total power demand at time t, , a i,t represents the cost coefficient of the i-th power generation unit, that is, the cost coefficient of the three-level substation, b i,t is the fixed cost, which represents the fixed operating cost of the i-th power generation unit.

[0010] As a further improvement of the present invention, it also includes a standby power adjustment step. After receiving the standby power adjustment instruction, the standby response power value of the third-level substation under the other second-level substation is calculated according to the grid section constraints, equipment operation safety constraints, resource adjustment capabilities and adjustment costs of other second-level substations, and the standby response power value is aggregated to the first-level fault equipment through the other second-level substations.

[0011] As a further improvement of the present invention, it also includes a section control step. When the substation fault information is a substation tripping, the output frequency of the first-level fault equipment is adjusted according to the power required for the current power grid operation, and other first-level substations are set as controllable substations. The section sensitivity is calculated according to the load forecast of the controllable substation and the power and distribution of other adjustable substations connected to the controllable substation, and a power control strategy is generated according to the section sensitivity to input power to the first-level fault equipment.

[0012] As a further improvement of the present invention, the cross-section sensitivity calculation configuration includes: ; Wherein, S represents the section sensitivity, N represents the number of other adjustable substations connected to the controllable substation; ω i represents the weight coefficient of the ith adjustable substation; L i represents the load forecast value of the i-th adjustable substation; P i is the power distribution of the ith adjustable substation, α and β are adjustment coefficients, which are used to adjust the section sensitivity value according to the actual situation.

[0013] As a further improvement of the present invention, it also includes a substation mutual assistance strategy, including when the distribution load of the substation's distribution equipment is higher than a threshold, setting the distribution equipment as a power receiving device, selecting other distribution equipment of the same level under the substation as mutual assistance distribution equipment according to the set load rate, and calculating the mutual assistance power value according to the load rate of the mutual assistance distribution equipment and inputting it into the power receiving device to complete the substation mutual assistance.

[0014] The beneficial effects of the present invention are: The present invention realizes the intelligent and automated dispatching of electric power resources by using a multi-level coordinated electric power dispatching method, and improves the flexibility and efficiency of electric power resource regulation by comprehensively managing the electric energy between the three-level power grids and using the secondary substation to perform heavy load regulation on the primary substation equipment. In addition, by calculating the aggregated cost value of each secondary substation equipment, the substation electric power regulation strategy with the lowest cost is selected, thereby reducing the electric power regulation cost and electric energy loss. The present invention also has a standby power regulation step. By using the standby power regulation strategy, when the secondary substation used for regulation fails, it can quickly respond to call the standby power resources of other secondary substations, further enhancing the reliability and flexibility of the electric power dispatching system. By setting the substation mutual assistance strategy and the section control strategy, the regulation capability of the secondary substation equipment under high load conditions is further improved, mutual assistance between substations is achieved, and the overall reliability of the system is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a flow chart of the overall method of the present invention; Figure 2 is a flow chart of standby power regulation in the present invention; Figure 3 It is a flow chart of section control in the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0017] Therefore, the present invention designs such a comprehensive dispatching and control method of electric power resources based on multi-level collaboration, such as Figure 1 As shown, the following steps are included: The fault data acquisition step obtains the substation fault information and outputs a heavy load adjustment instruction according to the substation fault information; when a substation fault is detected, that is, the substation load is higher than the threshold, it is determined whether the substation is a first-level substation. The first-level substation is a provincial substation. When a pseudo-first-level substation fails, the power resource dispatching system issues a heavy load adjustment instruction.

[0018] The response strategy planning step receives the heavy load adjustment instruction, sets the first-level substation corresponding to the substation fault information as the first-level fault equipment, and after determining the first-level fault equipment, calculates the total load rate according to the current load rate of the first-level fault equipment and the predicted load rate change curve. The total load rate represents the predicted power consumption of the first-level fault equipment in the future. When the total load rate is greater than the set threshold, it means that the first-level fault equipment cannot meet the power supply demand by itself. At this time, it is necessary to obtain the adjustable power resources of the second-level substation under the first-level substation. The second-level substation is a municipal modulation substation. The municipal modulation substation can judge whether to respond to the adjustment and output the auxiliary response adjustment instruction or the standby power adjustment instruction according to the total load rate of the first-level fault equipment and the adjustable power resources of the first-level fault equipment itself; when the adjustable power resources are greater than the total load rate of the first-level fault equipment, the municipal modulation substation can meet its own power demand and has the power dispatching conditions. At this time, the second-level substation receives the auxiliary response adjustment instruction and enters the auxiliary response adjustment state to prepare for supplying power to the first-level substation.

[0019] Auxiliary response adjustment step, receiving the auxiliary response adjustment instruction, calculating the power generation value and energy storage value of the third-level substation under the second-level substation, the third-level substation is a county-level adjustment substation, calculating the power generation value and energy storage value of the county-level adjustment substation and the district-level adjustment substation under the municipal-level adjustment substation, and obtaining their overall energy storage power resources, calculating the aggregation cost value of the third-level substation, determining the response of the third-level substation and the power value used for auxiliary response adjustment according to the aggregation cost value, and aggregating the auxiliary response adjustment power value to the connected second-level substation, obtaining the comprehensive dispatch value of power resources through the adjustable power resources of the second-level substation and the auxiliary response adjustment power value and inputting it into the first-level fault equipment.

[0020] For example, during the peak summer season in a certain place, the power grid load continues to increase due to the continuous high temperature and hot weather. One morning, the main transformer of the first-level substation was overloaded. If no measures are taken, it is expected that the load rate will exceed 95% after the photovoltaic output decreases in the evening, and the maximum gap will be about 2MW. According to the power grid topology analysis, the adjustable resources of the first-level substation are connected to the third-level substation affiliated to the second-level substation. The three-level coordinated power resource control system will convert the third-level substation from the economic operation mode to the auxiliary response mode in advance according to the load rate of the main transformer of the first-level substation, the adjustable resources and response of the third-level substation, and issue it after confirmation by the local adjustment. In the auxiliary response mode, the energy storage system waits for the adjustment command after being fully charged during the idle period, and the phase change cold storage air conditioning system waits for the adjustment command after storing cold during the idle period. According to the load forecast of the park, the power demand of the air conditioner, and the operation status of the energy storage, the third-level substation aggregates the equivalent values ​​into virtual power generation value and virtual energy storage value, and obtains the load reduction capacity of 2.3MW, which is reported to the three-level coordinated power resource control system. The three-level coordinated power resource control system generates a response strategy based on the adjustment range and adjustment cost after the aggregation of the three-level substations and the main distribution network topology, with the goal of minimizing the total adjustment cost and taking into account the overall adjustment constraints: in the initial state of the system, all equivalent energy storages are in standby state, and the equivalent generator is in shutdown state (0MW). At this time, the cost priority strategy is adopted to select the best power adjustment unit according to the aggregated cost value.

[0021] Specifically, the power generation value calculation is configured with an equivalent power generation model: ; Among them, G represents the power generation value, Indicates the maximum speed limit of power generation. Indicates the minimum speed limit for power generation. Represents the power output, and G represents the total power generation value within time t when the power output meets the operating range. The power generation value is calculated by setting the maximum power generation speed limit, the minimum power generation speed limit, and the power output. The power generation value takes into account the cumulative effect of the power output power p when it meets the operating range, and is subject to the constraints of the maximum power generation speed limit and the minimum power generation speed limit. The power generation value of the substation is calculated, which helps to achieve precise control in the power dispatching process and ensure the stable operation of the power grid and the balance of power supply and demand.

[0022] Specifically, the energy storage value calculation configuration has an equivalent energy storage model: ; Where B represents the energy storage value, represents the energy state of the equivalent energy storage model within time t, Represents the power output of the equivalent energy storage model at time t. The equivalent energy storage model is used to predict the energy state and power output of the substation at different time points, and calculate the energy storage value to reflect the power resource reserve of the substation. And by limiting the power of the substation, the utilization efficiency of power resources can be improved and power resources can be reasonably allocated.

[0023] Specifically, the aggregation cost value calculation is configured with an aggregation cost model: ; in, represents the aggregate cost value, represents the total power demand at time t, , a i,t represents the cost coefficient of the i-th power generation unit, that is, the cost coefficient of the three-level substation, b i,t is the fixed cost, which represents the fixed operating cost of the ith power generation unit. The aggregated cost model uses the total power and cost coefficient as parameters and adjusts according to the cost conditions of different power generation units to obtain the aggregated cost values ​​of different substations. The aggregated cost value can be used to determine the comprehensive value and cost of the substation when dispatching power resources to the superior substation, thereby reducing costs in the process of power resource dispatch.

[0024] Specifically, the electric power resource scheduling and control method based on multi-level collaboration of the present invention also includes a standby power adjustment step. After receiving the standby power adjustment instruction, the standby response power value of the third-level substation under the other second-level substation is calculated according to the grid section constraints, equipment operation safety constraints, resource adjustment capabilities and adjustment costs of other second-level substations, and the standby response power value is aggregated to the first-level fault equipment through the other second-level substations.

[0025] When the provincial dispatching reserve is insufficient to respond, for example, due to cloudy and hot weather, the load level of the whole province is higher than the predicted value, and the photovoltaic output is significantly lower than the predicted value, the positive reserve of the whole province's power grid is abnormally tight, and the provincial dispatching multi-flexible resource coordinated control master station generates a control strategy based on the lack of positive reserve, the response capacity and duration of adjustable resources in various cities, and the subsequent short-term load forecast. After confirmation by the provincial dispatching, it is issued, requiring the increase of regional unit output during the scheduled period. At this time, other power grids use the main distribution coordinated state estimation and flexible resource dynamic aggregation functions, comprehensively consider factors such as grid section constraints, equipment operation safety constraints, resource regulation capabilities and regulation costs, and aggregate the resource response capabilities of the third-level microgrids belonging to other power grids to the total aggregation substation, and then gather them to the said power grid and send them to the provincial dispatching multi-flexible resource coordinated control master station.

[0026] Specifically, it also includes a section control step. When the substation fault information is a substation tripping, the output frequency of the first-level fault equipment is adjusted according to the power required for the current power grid operation, and other first-level substations are set as controllable substations. The section sensitivity is calculated according to the load forecast of the controllable substation and the power and distribution of other adjustable substations connected to the controllable substation, and a power control strategy is generated according to the section sensitivity to input power to the first-level fault equipment.

[0027] Specifically, the cross-section sensitivity calculation configuration includes: ; Wherein, S represents the section sensitivity, N represents the number of other adjustable substations connected to the controllable substation; ω i represents the weight coefficient of the ith adjustable substation; L i represents the load forecast value of the i-th adjustable substation; P i is the power distribution of the ith adjustable substation, α and β are adjustment coefficients, which are used to adjust the section sensitivity value according to the actual situation.

[0028] When the substation tripped due to severe line icing caused by severe freezing rain, the stability limit of the main transformer of the faulty substation was adjusted to 1800MW due to the change of the grid structure. After the emergency adjustment of the 220kV and 110kV grid operation modes, the faulty substation was temporarily controllable, but the load was expected to continue to increase to 1815MW during the subsequent peak load period, exceeding the set threshold. In the afternoon of the same day, due to rainy weather, the photovoltaic output was low and the load continued to rise. According to speculation, the load of the faulty substation will be seriously overloaded. At this time, by setting other substations at the same level as the faulty substation as controllable substations, the control strategy was generated according to its flexible and adjustable resource access, adjustable capacity, and the power generation sequence of the local hydropower station, and according to the curve issued by the provincial regulation, the controllable substation was involved in aggregation and regulation to complete the section control of power resource regulation.

[0029] Specifically, it also includes a substation mutual assistance strategy, including setting the distribution equipment as a power receiving device when the distribution and transformation load of the substation's distribution equipment is higher than a threshold, selecting other distribution equipment of the same level under the substation as mutual assistance distribution equipment according to the set load rate, and calculating the mutual assistance power value according to the load rate of the mutual assistance distribution equipment and inputting it into the power receiving device to complete the substation mutual assistance.

[0030] The present invention realizes the intelligent and automated dispatching of electric power resources by using a multi-level coordinated electric power dispatching method, and improves the flexibility and efficiency of electric power resource regulation by comprehensively managing the electric energy between the three-level power grids and using the secondary substation to perform heavy load regulation on the primary substation equipment. In addition, by calculating the aggregated cost value of each secondary substation equipment, the substation electric power regulation strategy with the lowest cost is selected, thereby reducing the electric power regulation cost and electric energy loss. The present invention also has a standby power regulation step. By using the standby power regulation strategy, when the secondary substation used for regulation fails, it can quickly respond to call the standby power resources of other secondary substations, further enhancing the reliability and flexibility of the electric power dispatching system. By setting the substation mutual assistance strategy and the section control strategy, the regulation capability of the secondary substation equipment under high load conditions is further improved, mutual assistance between substations is achieved, and the overall reliability of the system is enhanced.

[0031] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A comprehensive dispatching and control method for electric power resources based on multi-level collaboration, characterized in that: The steps include: A fault data acquisition step, acquiring substation fault information, and outputting a heavy load adjustment instruction according to the substation fault information; The response strategy planning step includes receiving the heavy load adjustment instruction, setting the primary substation corresponding to the substation fault information as the primary fault device, calculating the total load rate of the primary fault device, and judging whether the secondary substation responds to the adjustment and outputting the auxiliary response adjustment instruction or the standby power adjustment instruction according to the total load rate of the primary fault device and the adjustable power resource amount of the secondary substation under the primary fault device; The auxiliary response adjustment step receives the auxiliary response adjustment instruction, calculates the power generation value and energy storage value of the third-level substation under the second-level substation, and calculates the aggregation cost value, obtains the auxiliary response adjustment power value of the third-level substation according to the aggregation cost value analysis, and aggregates the auxiliary response adjustment power value to the connected second-level substation, obtains the comprehensive dispatch value of power resources through the adjustable power resource amount of the second-level substation and the auxiliary response adjustment power value and inputs it into the first-level fault equipment.

2. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1 is characterized in that: The response strategy planning step, after determining the primary fault equipment, calculates the total load rate according to the current load rate of the primary fault equipment and the predicted load rate change curve, and obtains the adjustable power resource amount of the subordinate secondary substation. When the adjustable power resource amount is greater than the total load rate of the primary fault equipment, the primary fault equipment outputs an auxiliary response adjustment instruction, and the secondary substation receives the auxiliary response adjustment instruction and enters the auxiliary response adjustment state.

3. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1 is characterized in that: The power generation value calculation is configured with an equivalent power generation model: ； Among them, G represents the power generation value, Indicates the maximum speed limit of power generation. Indicates the minimum speed limit for power generation. It represents the power generation output power, and G represents the total power generation value within time t when the power generation output power meets the operating range.

4. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1, characterized in that: The energy storage value calculation configuration has an equivalent energy storage model: ； Where B represents the energy storage value, represents the energy state of the equivalent energy storage model within time t, Represents the power output of the equivalent energy storage model at time t.

5. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1 is characterized in that: The aggregation cost value calculation is configured with an aggregation cost model: ； in, represents the aggregate cost value, represents the total power demand at time t, , a i,t represents the cost coefficient of the i-th power generation unit, that is, the cost coefficient of the three-level substation, b i,t is the fixed cost, which represents the fixed operating cost of the i-th power generation unit.

6. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1 is characterized in that: It also includes a backup power adjustment step. After receiving the backup power adjustment instruction, the backup response power value of the third-level substation under the other secondary substation is calculated according to the grid section constraints, equipment operation safety constraints, resource adjustment capabilities and adjustment costs of other secondary substations, and the backup response power value is aggregated to the first-level fault equipment through the other secondary substations.

7. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1, characterized in that: It also includes a section control step. When the substation fault information is a substation tripping, the output frequency of the first-level fault equipment is adjusted according to the power required for the current power grid operation, and other first-level substations are set as controllable substations. The section sensitivity is calculated according to the load forecast of the controllable substation and the power and distribution of other adjustable substations connected to the controllable substation, and a power control strategy is generated according to the section sensitivity to input power to the first-level fault equipment.

8. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 7 is characterized in that: The cross-section sensitivity calculation configuration includes: ； Wherein, S represents the section sensitivity, N represents the number of other adjustable substations connected to the controllable substation; ω i represents the weight coefficient of the ith adjustable substation; L i represents the load forecast value of the i-th adjustable substation; P i is the power distribution of the ith adjustable substation, α and β are adjustment coefficients, which are used to adjust the section sensitivity value according to the actual situation.

9. The method for comprehensive dispatching and controlling electric power resources based on multi-level collaboration according to claim 1, characterized in that: It also includes a substation mutual assistance strategy, including setting the distribution equipment as a power receiving device when the distribution and transformation load of the substation's distribution equipment is higher than a threshold, selecting other distribution equipment of the same level under the substation as mutual assistance distribution equipment according to the set load rate, and calculating the mutual assistance power value according to the load rate of the mutual assistance distribution equipment and inputting it into the power receiving device to complete the substation mutual assistance.

Images