Provincial and local two-level active power collaborative control method and system with high proportion of distributed energy

Abstract

The application discloses a kind of high proportion distributed energy containing province and ground two-stage active collaborative control method and system, the method includes: obtaining the upper limit of each local control area of region power grid distributed energy forecast adjustment and output power, tie line transmission power, region power grid and its upper level province power grid tie line net exchange power deviation and power grid frequency deviation;Active disturbance calculation model of each local control area in region power grid is constructed, and disturbance type is determined;According to the disturbance position and type, determine the control batch of multiple rounds and carry out corresponding power regulation control, meet the active balance control requirement.The application combines the actual characteristics of distributed energy access, preferentially exert the fast regulation ability of distributed energy to improve the control efficiency of local disturbance, and improve the collaborative control level of province and ground two-stage power grid, guarantee power grid frequency stability and tidal flow safety distribution.

Description

Technical Field

[0001] This invention relates to automatic generation control technology for power systems, and more particularly to a provincial and local level active power coordinated control method and system that includes a high proportion of distributed energy resources. Background Technology

[0002] Against the backdrop of the "dual carbon" goals and the construction of a new power system dominated by new energy sources, the drive for clean and efficient energy use is propelling distributed energy towards large-scale, highly aggregated, and deeply interactive development. However, the massive, heterogeneous regulation resources are characterized by their large scale, diverse types, wide distribution, and complex characteristics, significantly increasing the difficulty of real-time control. New frequency regulation resources, such as new energy sources, various types of energy storage, and load aggregators, are constantly emerging. Compared with existing conventional power sources, they are characterized by smaller individual capacity, greater differences in regulation characteristics, wider geographical distribution, and hundreds of times greater quantity.

[0003] Currently, active power control for distributed energy resources is mainly centralized, with provincial power grids uniformly regulating conventional hydropower and thermal power to maintain active power balance. This is primarily achieved through automatic generation control systems, a system that has been used in power grids both domestically and internationally for many years. However, distributed energy resources are mainly located in distribution networks, are numerous but have small capacities. Existing centralized control systems and methods are ill-suited to the characteristics of massive, heterogeneous, and time-varying adjustment resources in the new power system. This significantly increases the difficulty of real-time active power control of the power grid and fails to fully leverage the collaborative control capabilities of provincial and municipal power grids. Summary of the Invention

[0004] Purpose of the invention: The present invention aims to provide a method and system for coordinated active power control at the provincial and local levels, including a high proportion of distributed energy sources, which can achieve local control and improve the coordinated control level of provincial and local power grids.

[0005] Technical solution: The present invention provides a provincial and local level active power coordinated control method with a high proportion of distributed energy resources, comprising the following steps:

[0006] (1) Obtain the upper limit of distributed energy forecast regulation and output power, tie line transmission power, net exchange power deviation of the regional power grid and its superior provincial power grid tie lines, and power grid frequency deviation in each local control area of ​​the regional power grid.

[0007] (2) Construct active power disturbance calculation models for each local control area within the regional power grid and determine the disturbance types;

[0008] (3) Based on the location and type of disturbance, determine the multi-round control batches and perform corresponding power regulation control; the process includes:

[0009] (3.1) The local control area where a disturbance occurs within the regional power grid is designated as the first control batch, and the distributed energy regulation power is determined based on the disturbance power;

[0010] (3.2) The local control area within the regional power grid where no disturbance occurs is the second control batch. The adjustment power allocated to the remaining local control areas is determined based on the adjustable capacity of the local control areas where disturbances occur in the first control batch.

[0011] (3.3) Thermal power plants under the jurisdiction of the next higher-level provincial power grid located within the regional power grid are the third control batch, and the regulating power of thermal power plants is determined based on the active power balance deviation of the regional power grid.

[0012] Preferably, the active power disturbance calculation model for constructing the local control area within the regional power grid in step (2) is as follows:

[0013]

[0014] In the formula, ΔP i,CA (t) represents the change in active power in the local control region i at time t; G a (t) and G a (t-1) represent the output power of distributed energy source a at times t and t-1, respectively; L b (t) and L b (t-1) represent the power consumed by load b at times t and t-1, respectively; T c (t) and T c (t-1) represents the transmission power of tie line c at times t and t-1, respectively; A, B, and C represent the number of distributed energy sources, loads, and tie lines in local control area i, respectively; i, a, b, and c represent the numbers of local control area, distributed energy source, load, and tie line, respectively.

[0015] Preferably, the process of determining the disturbance type in step (2) is as follows:

[0016] Since the load power consumption in the active power disturbance calculation model cannot be directly obtained, the disturbance type is determined according to the following discrimination method:

[0017]

[0018] In the formula, D i The perturbation type is D, which defaults to 0. i A value of 1 indicates a failure in the distributed energy source, D i A value of 2 indicates a load failure, D i A value of 3 indicates a fault in the tie line; ε a,min The minimum output power of distributed energy source a; ε load,min ε is the threshold for determining load failure; c,min This represents the minimum output power of the tie line c.

[0019] Preferably, step (3.1) includes:

[0020] Based on the disturbance type, a disturbance power model for the local control area is constructed as follows:

[0021]

[0022] When LOSS i When the power is less than 0, the regulation power of distributed energy sources is calculated as follows:

[0023]

[0024] When LOSS i When the value is greater than 0, the regulation power of distributed energy sources is calculated as follows:

[0025]

[0026] In the formula, LOSS i REG represents the disturbance power of local control region i. a HL is the regulating power of distributed energy source a; a K represents the upper limit for the prediction and adjustment of distributed energy source a; i,P is the proportional gain coefficient for local control region i.

[0027] Preferably, step (3.2) includes:

[0028] Determine the total regulation power loss (LOSS) allocated to other local control areas where no disturbance occurs. other for

[0029]

[0030] When LOSS other The regulation power allocated to the local control area where the value is less than 0 and no disturbance occurs is as follows:

[0031]

[0032] When LOSS other >0, the regulation power allocated to the local control area without disturbance is as follows:

[0033]

[0034] In the formula, LOSS other REG represents the total regulation power allocated to the local control area j where no disturbance occurs; G represents the number of distributed energy sources within the local control area j where no disturbance occurs; REG j,CA The regulation power allocated to the local control region j where no disturbance occurs; CA represents the local control region; HL represents the regulation power allocated to the local control region j where no disturbance occurs. g and G g These represent the predicted regulation limit and output power of the distributed energy source g within the non-disturbance local control area j, respectively; g is the number of the distributed energy source within the non-disturbance local control area j.

[0035] Preferably, the thermal power regulation power calculation in step (3.3) is as follows:

[0036]

[0037] In the formula, REGz represents the regulating power of thermal power plant z under the jurisdiction of the provincial power grid; α z K represents the apportionment coefficient for thermal power plants z under the jurisdiction of the provincial power grid; Z represents the number of thermal power plants z under the jurisdiction of the provincial power grid; k,P PE is the proportional gain coefficient of the regional power grid. k Z represents the active power balance deviation of the regional power grid k; k and z are the designations of the thermal power plants under the jurisdiction of the regional power grid and the provincial power grid, respectively.

[0038] Preferably, the active power balance deviation PE of the regional power grid k k for:

[0039]

[0040] In the formula, δ k ΔP is the apportionment factor for the regional power grid k; K is the number of regional power grids within the provincial power grid; ACE is the regional control deviation of the provincial power grid; ΔP k,ZTIE The net switching deviation of the tie line in the regional power grid k;

[0041] Among them, the regional control deviation of the provincial power grid is ACE = -10BΔF + ΔP PTIE

[0042] In the formula, B is the provincial power grid frequency deviation coefficient; ΔF is the power grid frequency deviation; ΔP PTIE This refers to the exchange deviation of the provincial power grid's interconnection lines.

[0043] The present invention discloses a provincial and local two-level active power coordinated control system with a high proportion of distributed energy resources, comprising:

[0044] The data acquisition module is used to obtain the upper limit of distributed energy forecast regulation and output power, the transmission power of tie lines, the net exchange power deviation of the tie lines of the regional power grid and its superior provincial power grid, and the grid frequency deviation in each local control area of ​​the regional power grid.

[0045] The disturbance type determination module is used to construct active power disturbance calculation models for each local control area within the regional power grid and determine the disturbance type.

[0046] The power regulation control module is used to determine multiple control batches and corresponding regulation power based on the location and type of disturbance. The determination of multiple control batches and corresponding regulation power includes: the first control batch is the local control area where a disturbance occurs within the regional power grid, and the distributed energy regulation power is determined based on the disturbance power; the second control batch is the local control area within the regional power grid where no disturbance occurs, and the regulation power allocated to the remaining local control areas is determined based on the adjustable capacity of the local control areas where disturbances occurred in the first control batch; the third control batch is the thermal power plant under the jurisdiction of the next higher-level provincial power grid located within the regional power grid, and the thermal power regulation power is determined based on the active power balance deviation of the regional power grid.

[0047] The present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the aforementioned provincial and local level active power coordinated control method with a high proportion of distributed energy.

[0048] The present invention discloses a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described provincial and local level active power coordinated control method containing a high proportion of distributed energy resources.

[0049] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: Combining the actual characteristics of distributed energy access, it gives priority to giving full play to the rapid adjustment capability of distributed energy to improve the control efficiency of local disturbances, and improves the coordinated control level of provincial and local power grids, ensuring the stability of power grid frequency and the safe distribution of power flow. Attached Figure Description

[0050] Figure 1 This is a diagram of the provincial and local level collaborative control architecture of the present invention;

[0051] Figure 2 This is a flowchart of the method of the present invention. Detailed Implementation

[0052] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0053] like Figure 1 As shown, a certain regional power grid includes 6 local control areas, which are connected to the provincial power grid dispatch and control center at the next higher level. The provincial power grid at the next higher level, located within the regional power grid, manages 3 thermal power plants.

[0054] like Figure 2 As shown, the present invention provides a provincial and local level active power coordinated control method with a high proportion of distributed energy resources, comprising the following steps:

[0055] (1) Obtain the upper limit of distributed energy forecast regulation and output power, tie-line transmission power, net exchange power deviation of the regional power grid and its superior provincial power grid, and grid frequency deviation for the six local control areas in the regional power grid; among which, the six local control areas in the regional power grid are as follows: Figure 1 As shown.

[0056] (2) Construct active power disturbance calculation models for six local control areas within the regional power grid and determine the disturbance types.

[0057] The active power disturbance calculation model for the local control area within the regional power grid constructed in this embodiment is as follows:

[0058]

[0059] In the formula, ΔP i,CA (t) represents the change in active power in the local control region i at time t; G a (t) and G a (t-1) represent the output power of distributed energy source a at times t and t-1, respectively; L b (t) and L b (t-1) represent the power consumed by load b at times t and t-1, respectively; T c (t) and T c (t-1) represents the transmission power of tie line c at times t and t-1, respectively; A, B, and C represent the number of distributed energy sources, loads, and tie lines in local control area i, respectively; i, a, b, and c represent the numbers of local control area, distributed energy source, load, and tie line, respectively.

[0060] Since the load power consumption in the active power disturbance calculation model cannot be directly obtained, the disturbance type is determined according to the following discrimination method:

[0061]

[0062] In the formula, D i The perturbation type is D, which defaults to 0. i A value of 1 indicates a failure in the distributed energy source, D i A value of 2 indicates a load failure, D i A value of 3 indicates a fault in the tie line; ε a,min The minimum output power of distributed energy source a; ε load,min ε is the threshold for determining load failure; c,min This is the minimum output power value for tie line c. To prevent measurement errors, it can be set to a smaller value.

[0063] (3) Based on the location and type of disturbance, determine the number of control rounds to meet the active power balance control requirements. The specific control process is as follows:

[0064] (3.1) The local control area where a disturbance occurs within the regional power grid is designated as the first control batch. The distributed energy regulation power is determined based on the disturbance power. The disturbance power model for the local control area is as follows:

[0065]

[0066] When LOSS i When the power is less than 0, the regulation power of distributed energy sources is calculated as follows:

[0067]

[0068] When LOSS i When the value is greater than 0, the regulation power of distributed energy sources is calculated as follows:

[0069]

[0070] In the formula, LOSS i REG represents the disturbance power of local control region i. a HL is the regulating power of distributed energy source a; a K represents the upper limit for the prediction and adjustment of distributed energy source a; i,P is the proportional gain coefficient for local control region i.

[0071] (3.2) The local control areas within the regional power grid where no disturbances occur are designated as the second control batch. The remaining regulation power allocated to the local control areas in the first control batch is determined based on the adjustable capacity of the local control areas where disturbances occurred. The remaining regulation power allocated to the local control areas is the total regulation power (LOSS) allocated to the other local control areas where no disturbances occurred. other for

[0072]

[0073] When LOSS other The regulation power allocated to the local control area with a value of <0 and no disturbance is as follows:

[0074]

[0075] When LOSS other >0, the regulation power allocated to the local control area without disturbance is as follows:

[0076]

[0077] In the formula, LOSS other REG represents the total regulation power allocated to other local control areas where no disturbance occurs; G represents the number of distributed energy sources within local control area j where no disturbance occurs; REG j,CAThe regulation power allocated to the local control area j without disturbance; J is the number of local control areas without disturbance; CA is the local control area; HL g and G g These represent the predicted regulation limit and output power of the distributed energy source g within the non-disturbance local control area j, respectively; g is the number of the distributed energy source within the non-disturbance local control area j.

[0078] (3.3) The three thermal power plants located within the regional power grid and under the jurisdiction of the next higher-level provincial power grid are designated as the third control batch. The regulating power of these thermal power plants is determined based on the active power balance deviation of the regional power grid. The calculation process includes:

[0079] First, calculate the regional control deviation (ACE) of the provincial power grid:

[0080] ACE = -10BΔF + ΔP PTIE

[0081] In the formula, B is the provincial power grid frequency deviation coefficient; ΔF is the power grid frequency deviation; ΔP PTIE This refers to the switching deviation of the provincial power grid's interconnection lines;

[0082] Secondly, calculate the active power balance deviation PE of the regional power grid k. k :

[0083]

[0084] In the formula, δ k ΔP is the apportionment factor for the regional power grid k; K is the number of regional power grids within the provincial power grid; ΔP k,ZTIE The net switching error of the tie line in the regional power grid k;

[0085] Finally, the regulating power REGz of the thermal power plant z under the jurisdiction of the provincial power grid is calculated as follows:

[0086]

[0087] In the formula, α z K represents the apportionment coefficient for thermal power plants z under the jurisdiction of the provincial power grid; Z represents the number of thermal power plants z under the jurisdiction of the provincial power grid; k,P denoted as k, which is the proportional gain coefficient of the regional power grid; k and z are the designations of the thermal power plants under the jurisdiction of the regional power grid and the provincial power grid, respectively.

[0088] The present invention discloses a provincial and local two-level active power coordinated control system with a high proportion of distributed energy resources, comprising:

[0089] The data acquisition module is used to obtain the upper limit of distributed energy forecast regulation and output power, the transmission power of tie lines, the net exchange power deviation of the tie lines of the regional power grid and its superior provincial power grid, and the grid frequency deviation in each local control area of ​​the regional power grid.

[0090] The disturbance type determination module is used to construct active power disturbance calculation models for each local control area within the regional power grid and determine the disturbance type.

[0091] The power regulation control module is used to determine multiple control batches and corresponding regulation power based on the location and type of disturbance. The determination of multiple control batches and corresponding regulation power includes: the first control batch is the local control area where a disturbance occurs within the regional power grid, and the distributed energy regulation power is determined based on the disturbance power; the second control batch is the local control area within the regional power grid where no disturbance occurs, and the regulation power allocated to the remaining local control areas is determined based on the adjustable capacity of the local control areas where disturbances occurred in the first control batch; the third control batch is the thermal power plant under the jurisdiction of the next higher-level provincial power grid located within the regional power grid, and the thermal power regulation power is determined based on the active power balance deviation of the regional power grid.

[0092] The present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the aforementioned provincial and local level active power coordinated control method with a high proportion of distributed energy.

[0093] The present invention discloses a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described provincial and local level active power coordinated control method containing a high proportion of distributed energy resources.

Claims

1. A provincial and local level active power coordinated control method incorporating a high proportion of distributed energy resources, characterized in that, Includes the following steps: (1) Obtain the upper limit of distributed energy forecast regulation and output power, tie line transmission power, net exchange power deviation of the regional power grid and its superior provincial power grid tie line, and power grid frequency deviation in each local control area of ​​the regional power grid; (2) Construct active power disturbance calculation models for each local control area within the regional power grid and determine the disturbance types; The active power disturbance calculation model for the local control area within the regional power grid is as follows: In the formula, G represents the change in active power in the local control region i at time t; a (t) and G a (t-1) represent the output power of distributed energy source a at times t and t-1, respectively; L b (t) and L b (t-1) represent the power consumed by load b at times t and t-1, respectively; T c (t) and T c (t-1) represents the transmission power of tie line c at times t and t-1, respectively; A, B, and C represent the number of distributed energy sources, loads, and tie lines in local control area i, respectively. i, a, b, and c are the numbers for the local control area, distributed energy source, load, and tie line, respectively. The type of disturbance is determined according to the following method: In the formula, D i For the type of disturbance, D i A value of 1 indicates a failure in the distributed energy source, D i A value of 2 indicates a load failure, D i A value of 3 indicates a fault in the tie line; The minimum output power for distributed energy source a; This serves as the threshold for determining whether a load failure has occurred. This represents the minimum output power of tie line c. (3) Determine the multi-round control batches and perform corresponding power regulation control based on the location and type of disturbance; The process includes: (3.1) The local control area where a disturbance occurs within the regional power grid is the first control batch, and the distributed energy regulation power is determined based on the disturbance power; (3.2) The local control area within the regional power grid where no disturbance occurs is the second control batch. The adjustment power allocated to the remaining local control areas is determined based on the adjustable capacity of the local control areas where disturbances occur in the first control batch. (3.3) Thermal power plants under the jurisdiction of the next higher-level provincial power grid located within the regional power grid are the third control batch, and the regulating power of thermal power plants is determined based on the active power balance deviation of the regional power grid.

2. The provincial and local level active power coordinated control method with a high proportion of distributed energy resources according to claim 1, characterized in that, Step (3.1) includes: Based on the disturbance type, a disturbance power model for the local control area is constructed as follows: When LOSS i When the power is less than 0, the regulation power of distributed energy sources is calculated as follows: When LOSS i When the value is greater than 0, the regulation power of distributed energy sources is calculated as follows: In the formula, LOSS i REG represents the disturbance power of local control region i. a HL is the regulating power of distributed energy source a; a K represents the upper limit for the prediction and adjustment of distributed energy source a; i,P is the proportional gain coefficient for local control region i.

3. The provincial and local level active power coordinated control method with a high proportion of distributed energy resources according to claim 2, characterized in that, Step (3.2) includes: Determine the total regulation power loss (LOSS) allocated to other local control areas where no disturbance occurs. other for When LOSS other The regulation power allocated to the local control area with a value of <0 and no disturbance is as follows: When LOSS other >0, the regulation power allocated to the local control area without disturbance is as follows: In the formula, LOSS other REG represents the total regulation power allocated to the local control area j where no disturbance occurs; G represents the number of distributed energy sources within the local control area j where no disturbance occurs; REG j,CA The regulation power allocated to the local control region j where no disturbance occurs; CA represents the local control region; HL represents the regulation power allocated to the local control region j where no disturbance occurs. g and G g These represent the predicted regulation limit and output power of the distributed energy source g within the non-disturbance local control area j, respectively; g is the number of the distributed energy source within the non-disturbance local control area j.

4. The provincial and local level active power coordinated control method with a high proportion of distributed energy resources according to claim 3, characterized in that, The thermal power regulation power calculation in step (3.3) is as follows: In the formula, REGz represents the regulating power of thermal power plant z under the jurisdiction of the provincial power grid; K represents the apportionment coefficient for thermal power plants z under the jurisdiction of the provincial power grid; Z represents the number of thermal power plants z under the jurisdiction of the provincial power grid; k,P PE is the proportional gain coefficient of the regional power grid. k Z represents the active power balance deviation of the regional power grid k; k and z are the designations of the thermal power plants under the jurisdiction of the regional power grid and the provincial power grid, respectively.

5. The provincial and local level active power coordinated control method with a high proportion of distributed energy resources according to claim 4, characterized in that, The active power balance deviation PE of the regional power grid k k for: In the formula, is the allocation coefficient of the regional power grid k; K is the number of regional power grids within the provincial power grid; ACE is the regional control deviation of the provincial power grid; The net switching error of the tie line in the regional power grid k; Among them, the regional control deviation of provincial power grids In the formula, This refers to the frequency deviation coefficient of the provincial power grid. This refers to the power grid frequency deviation. This refers to the exchange deviation of the provincial power grid's interconnection lines.

6. A provincial-level two-tier active power coordinated control system incorporating a high proportion of distributed energy resources, used to implement the provincial-level two-tier active power coordinated control method incorporating a high proportion of distributed energy resources as described in any one of claims 1-5, characterized in that, include: The data acquisition module is used to obtain the upper limit of distributed energy forecast regulation and output power, the transmission power of tie lines, the net exchange power deviation of the tie lines of the regional power grid and its superior provincial power grid, and the grid frequency deviation in each local control area of ​​the regional power grid. The disturbance type determination module is used to construct active power disturbance calculation models for each local control area within the regional power grid and determine the disturbance type. The power regulation control module is used to determine the multiple control batches and corresponding regulation power based on the location and type of disturbance. The determination of multiple control batches and corresponding adjustment power includes: the local control area where disturbances occur within the regional power grid is the first control batch, and the distributed energy adjustment power is determined based on the disturbance power; The second control batch consists of local control areas within the regional power grid where no disturbances have occurred. The remaining regulation power allocated to the local control areas is determined based on the adjustable capacity of the local control areas where disturbances have occurred in the first control batch. The third control batch consists of thermal power plants under the jurisdiction of the next higher-level provincial power grid located within the regional power grid. The regulation power of the thermal power plants is determined based on the active power balance deviation of the regional power grid.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the provincial and local level active power coordinated control method with a high proportion of distributed energy as described in any one of claims 1-5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the provincial and local level active power coordinated control method with a high proportion of distributed energy as described in any one of claims 1-5.

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