Real-time coordinated control method and system for regional source, grid, load and storage

Abstract

The present invention discloses a method and system for real-time coordinated control of regional source, grid, load and storage, the method comprising: in a local control mode, generating a correction scheme over a limited time, taking the minimum adjustment cost as the goal, considering relevant constraints, and decomposing the active adjustment target value of the control unit to the control object that needs to be corrected; in a provincial-local coordination mode, setting an apportionment ratio coefficient for the provincial adjustment and control equipment and the local adjustment equivalent virtual machine, apportioning the total active adjustment target value of the provincial power grid to the virtual generator according to the apportionment ratio coefficient, and decomposing and sending the apportioned active adjustment target value to the control object that needs to be corrected in the local adjustment. The system comprises a relevant safety analysis module, a safety correction auxiliary decision module and an automatic power generation control module, and the system is used to support the implementation of the above method. Through the precise control of the active power of the control object, the thermal stability and safety of the regional power grid is guaranteed, while making full use of various control objects and reducing unnecessary adjustment actions of conventional units.

Description

Technical Field

[0001] The present invention relates to the field of power system automation, and in particular to the research field of source-grid-load-storage coordinated control technology, and in particular to a method and system for real-time coordinated control of source-grid-load-storage at the regional level. Background Art

[0002] In recent years, with the rapid development of various types of new energy, electric vehicle and other industries, especially the access to large-scale distributed power sources, electric vehicles and other new energy supply and consumption equipment, the load characteristics of the regional power grid have undergone tremendous changes, and problems such as local line over-limits in the distribution network caused by tidal fluctuations have become prominent.

[0003] For the main grid, some provincial dispatching departments, based on the conventional automatic power generation control module, receive the correction scheme provided by the safety correction auxiliary decision-making module to adjust the power of conventional units and alleviate the static safety or transient stability problems of the main grid such as the main grid branch current or section over-limit. However, due to the lack of regulation resources and means, there is still a gap in the real-time coordinated control of source, grid, load and storage in the regional power grid. Summary of the invention

[0004] The purpose of the present invention is to make up for the shortcomings of the prior art and to provide a method and system for real-time coordinated control of sources, grids, loads and storage at the regional level, which can resolve local power grid safety issues common in the operation of typical regional power grids on the spot by mobilizing various adjustable control objects distributed in the "peripheral nerves" of the power grid, enrich the regulatory means of the regulatory agency, avoid the above-mentioned problems from being transmitted and aggregated to the main grid step by step, and help regional regulatory agencies resolve power grid peak-shaving contradictions and alleviate equipment overload problems from the bottom up.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for real-time coordinated control of regional-level sources, networks, loads and storage, which operates in two basic control modes, including a local control mode and a provincial-regional coordination mode;

[0007] In local control mode, the method comprises the following steps:

[0008] Taking the local regulation main transformer as the object, a plurality of control units are established according to the regional power grid topology structure, and each of the control units respectively includes a plurality of control objects distributed under the local regulation main transformer;

[0009] Under normal circumstances, the control objects in the ground control strictly follow the day-ahead operation curve;

[0010] After calculating the equipment over-limit information, a correction scheme is generated, which is the active power adjustment target value of the control unit that needs to be adjusted to solve the over-limit abnormality of the regional power grid. Then, with the minimum adjustment cost as the goal, the operation constraints of the control object and the power grid safety constraints are considered, and the active power adjustment target value of the control unit is decomposed into each of the control objects therein, and the real-time active power of the control object to be corrected is corrected to eliminate or alleviate the over-limit situation;

[0011] In the land-saving coordination mode, the method comprises the following steps:

[0012] Taking the local regulation main transformer as the object, a plurality of control units are established according to the regional power grid topology structure, and each of the control units respectively includes a plurality of control objects distributed under the local regulation main transformer;

[0013] Aggregate all the control objects in the local dispatching system, establish an equivalent virtual generator model, and set an allocation ratio coefficient for the provincial dispatching equipment and each local dispatching equivalent virtual machine;

[0014] According to the situation of the ACE of the provincial control sub-control area or the real-time regulation demand of the provincial power grid and the real-time status of the control objects in each local control, the total active regulation target value of the provincial power grid is allocated to the provincial control control equipment and each virtual generator according to the allocation ratio coefficient, and a remote regulation instruction is issued;

[0015] For the local regulator that has not received the remote regulation command, the control object in the local regulator strictly implements the day-ahead operation curve;

[0016] For the local adjustment that receives the remote adjustment command, the local adjustment will decompose the active adjustment target value distributed by the provincial power grid to the control unit that needs to be adjusted in the local adjustment according to the actual status of the regional power grid, and then take the minimum adjustment cost as the goal, consider the operation constraints of the control object and the power grid safety constraints, decompose the active adjustment target value of the control unit to each of the control objects therein, and correct the real-time active power of the control object that needs to be corrected, so as to achieve the provincial and local coordinated control goals.

[0017] Furthermore, the provincial control and regulation equipment includes conventional units controlled by the province, centralized new energy stations and centralized energy storage power stations.

[0018] Furthermore, the control object operation constraints include control object operation range constraints, control object load regulation rate constraints, energy storage charge and discharge capacity constraints, and control object regulation reserve constraints, which are as follows:

[0019] The operating range constraints of the control object are:

[0020] p i,minu(i,t)≤p(i,t)≤p i,max u(i,t)

[0021] Where: p i,min 、p i,max They represent the minimum and maximum active power of the control object i respectively; u(i, t) is the operating state of the control object i in time period t, 1 represents operation, and 0 represents shutdown;

[0022] The load regulation rate constraint of the control object is:

[0023] -Δ i ≤p i (t)-p i (t-1)≤Δ i

[0024] Where: -Δ i is the minimum value of load that can be added or subtracted for the control object i in each period; Δ i is the maximum value of load that can be added or subtracted by the control object i in each period; p i (t) is the active power of the controlled object i at time t; p i (t-1) is the active power of the controlled object i at time t-1;

[0025] The energy storage charge and discharge capacity constraint is:

[0026]

[0027] Where: i represents the i-th energy storage unit in the control object; n represents the number of continuous charge and discharge periods; E represents the upper limit of a single continuous charge and discharge amount;

[0028] The control object adjusts the standby constraint as follows:

[0029]

[0030]

[0031] Where: The upward reserve provided for adjustable resource i at time t; r′ i (t) is the downward reserve provided by adjustable resource i at time t; The upper limit of the reserve that can be provided by the adjustable resource i; It is the lower limit of downward reserve that can be provided by adjustable resource i.

[0032] Furthermore, the control objects are grouped according to their distribution characteristics and the grid structure, each group of control objects is defined as a resource cluster, and constraint management is performed on a resource cluster basis to ensure the safety of related branch and section flows;

[0033] The power grid security constraints include resource cluster power constraints and cluster regulation reserve constraints, which are as follows:

[0034] The resource cluster power constraints are:

[0035]

[0036] Where: I represents the resource cluster; H(t) , They represent the lower and upper constraints of the total output of the control objects in the cluster respectively;

[0037] The cluster adjustment standby constraint is:

[0038]

[0039]

[0040] Where: I represents the resource cluster; Indicates whether the cluster increases or decreases its standby constraints;

[0041] The cluster regulation reserve constraint will be used for certain heavy-load sections involved in the real-time coordination strategy, and will reserve regulation margins in advance for them when the safety correction mode is enabled.

[0042] Furthermore, the method is applicable to non-market scenarios;

[0043] The local regulation divides the control objects into two groups according to the evaluation results of the regional power grid operation. One group is the planned tracking group, in which the power grid flow of the electrical subdivision where the control objects are located is complex, and even some local equipment has exceeded the limit or overloaded. The other group is the free regulation group, in which the power grid flow of the electrical subdivision where the control objects are located is normal.

[0044] The control objects in the planned tracking group track the day-ahead operating curve, the control objects in the free regulation group are responsible for generating correction schemes or the active regulation target values ​​allocated by the provincial power grid, and the regulation power allocation of the control objects in the free regulation group takes into account the regulation margin, regulation rate, and regulation cost factors, so as to achieve the provincial and local coordinated control goals on the basis of ensuring the safety of the regional power grid.

[0045] Furthermore, the method is applicable to non-market scenarios;

[0046] The safe operation of the regional power grid is the primary goal of real-time coordinated control and has the highest priority. Between the regulation needs of the regional power grid and the safe operation of the regional power grid, the safe and stable operation of the regional power grid should be ensured first, and then the execution effect of the regulation needs should be considered;

[0047] When some control units within the regional power grid are in a heavy load condition, the control objects associated with these control units are prohibited from executing control instructions that deteriorate the status of these control units;

[0048] The equipment limits of the control objects in the ground control support multiple sources of values, and each source of value can be flexibly switched in real time. The value sources include manual settings and parameter libraries. The manually set values ​​of the equipment limits come from the equipment limits manually set by the control personnel and can be modified in real time. The parameter library values ​​of the equipment limits come from the corresponding PAS model parameters.

[0049] Furthermore, the method is applicable to non-market scenarios;

[0050] For the active regulation target value generated by the correction plan or distributed by the provincial power grid, the minimum regulation cost is taken as the goal and decomposed according to the weighted decomposition coefficient of the real-time adjustable potential of each controlled object, wherein the decomposition coefficient comprehensively considers the regulation cost, electrical topology structure and regulation risk factors of the controlled object.

[0051] Furthermore, the method is applicable to a market scenario and further comprises the following steps:

[0052] If the objects under the control of the local dispatching and regulation participate in the relevant auxiliary service market of the province as a whole, the market players are the regional source-grid-load-storage aggregates, which are uniformly cleared by the provincial dispatching market technical support system and the overall control target of the regional source-grid-load-storage aggregates is issued. The local dispatching and regulation shall decompose and control the instructions according to the overall control target of the regional source-grid-load-storage aggregates, refer to the declared data of each resource market and the real-time adjustable capacity, and consider the operation constraints and grid security constraints of the control objects. Each control object shall strictly implement the clearing curve within the day and cannot participate in free regulation.

[0053] If an abnormal situation occurs in the regional power grid during the operation of the market scenario, the safety correction auxiliary decision-making module will issue a strategy. The on-duty controller of the local dispatching department will apply to the provincial dispatching department to exit the market mode and manually exit the market mode. At this time, the automatic power generation control module will be adjusted according to the process of the local control mode, and the market scenario will be restored after the regional power grid resumes safe operation.

[0054] In a second aspect, the present invention provides a real-time coordinated control system for regional-level sources, grids, loads and storage, including a relevant safety analysis module, a safety correction auxiliary decision module and an automatic power generation control module;

[0055] The related safety analysis module is used to achieve: calculating the equipment over-limit information;

[0056] The safety correction auxiliary decision module is used to achieve: generating a correction plan;

[0057] The automatic power generation control module is used to achieve: taking the local regulation main transformer as the object to establish a plurality of control units according to the regional power grid topology structure, each of the control units respectively includes a plurality of control objects distributed under the local regulation main transformer; and

[0058] When an abnormal over-limit situation occurs in the regional power grid, based on a correction scheme, with the goal of minimizing the adjustment cost, and taking into account the operation constraints of the control object and the safety constraints of the power grid, the active adjustment target value of the control unit is decomposed into each of the control objects therein, and the real-time active power of the control object to be corrected is corrected to eliminate or alleviate the over-limit situation; or

[0059] All the control objects in the local dispatch are aggregated to establish an equivalent virtual generator model, and the allocation ratio coefficient is set for the provincial dispatching and regulating equipment and each local dispatching equivalent virtual machine; according to the situation of the ACE of the provincial dispatching sub-control area or the real-time regulation demand of the provincial power grid and the real-time status of the control objects in each local dispatching, the total active regulation target value of the provincial power grid is allocated to the provincial dispatching and regulating equipment and each virtual generator according to the allocation ratio coefficient, and a remote regulation instruction is issued; for the local dispatching that has not received the remote regulation instruction, the control objects in the local dispatching strictly implement the day-ahead operation curve; for the local dispatching that has received the remote regulation instruction, the local dispatching decomposes the active regulation target value issued by the provincial power grid to the control unit that needs to be adjusted in the local dispatching according to the actual status of the regional power grid, and then takes the minimum regulation cost as the goal, considers the operation constraints of the control object and the power grid safety constraints, decomposes the active regulation target value of the control unit to each of the control objects therein, and corrects the real-time active power of the control object that needs to be corrected to achieve the provincial and local coordinated control goal.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] 1. The method and system provided by the present invention calculate the real-time control deviation for each control object, and allocate the deviation according to the corresponding allocation principle, so as to reduce the execution deviation rate of the day-ahead operation curve. At the same time, when the upper power grid issues a regulation task or the local thermal stability of the regional power grid exceeds the limit, the control object can be used to the maximum extent to meet the safe operation control target;

[0062] 2. The method and system provided by the present invention take into account the coordinated control of various control objects and conventional units, make full use of various control objects, reduce unnecessary adjustment actions of conventional units, meet the grid adjustment needs and improve equipment utilization;

[0063] 3. The method and system provided by the present invention can be applied to two scenarios: participating in the auxiliary service market (market scenario) or not participating in the market (non-market scenario), and considering two modes: provincial coordinated control and local control, which can meet the relevant needs of different scenarios;

[0064] 4. The method and system provided by the present invention are based on the existing equipment of the regional dispatching master station, and do not require additional software and hardware;

[0065] 5. The method and system provided by the present invention have far-reaching significance for promoting social and economic development and improving production levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to make the advantages of the present invention more easily understood, the present invention briefly described above will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. It can be understood that these drawings only depict typical embodiments of the present invention and therefore should not be considered as limiting the scope of protection thereof, and the present invention is described and explained with additional characteristics and details through the accompanying drawings.

[0067] Figure 1 This is a data flow chart of the real-time coordination strategy in the land-saving coordination mode of the present invention. DETAILED DESCRIPTION

[0068] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the embodiments of the present invention, some technical features well known in the art are not described.

[0069] In order to fully understand the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0070] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0071] like Figure 1 As shown, an embodiment of the present invention provides a real-time coordinated control method for regional source, grid, load and storage. The method is designed with two basic control modes, namely local control mode and provincial coordination mode. The method can also be oriented to market scenarios and non-market scenarios to meet the relevant needs of different scenarios.

[0072] Example 1

[0073] In the local control mode, this embodiment provides a method for real-time coordinated control of source, grid, load and storage at the regional level, including the following steps:

[0074] S1. Taking the local regulation main transformer as the object, a number of control units are established according to the regional power grid topology structure, and each control unit includes a number of control objects distributed under the local regulation main transformer.

[0075] S2. Under normal circumstances, the control objects within the ground regulation strictly follow the day-ahead operating curve.

[0076] S3. After calculating the equipment over-limit information, a correction plan is generated. The correction plan is the active adjustment target value of the control unit that needs to be adjusted to solve the over-limit abnormal situation of the regional power grid. Then, with the minimum adjustment cost as the goal, the operating constraints of the control object and the power grid safety constraints are considered, and the active adjustment target value of the control unit is decomposed into each control object therein, and the real-time active power of the control object that needs to be corrected is corrected to eliminate or alleviate the over-limit situation.

[0077] In this embodiment, the control period to be adopted by the method provided in this embodiment is 20-60 seconds.

[0078] In this embodiment, the control object operation constraints include control object operation range constraints, control object load regulation rate constraints, energy storage charge and discharge capacity constraints, and control object regulation reserve constraints, which are as follows:

[0079] The operating range constraints of the control object are:

[0080] p i,min u(i,t)≤p(i,t)≤p i,max u(i,t)

[0081] Where: p i,min 、p i,max They represent the minimum and maximum active power of the control object i respectively; u(i, t) is the operating status of the control object i in time period t, 1 represents operation and 0 represents shutdown.

[0082] The load regulation rate constraint of the control object is:

[0083] -Δ i ≤p i (t)-p i (t-1)≤Δ i

[0084] Where: -Δ i is the minimum value of load that can be added or subtracted for the control object i in each period; Δ i is the maximum value of load that can be added or subtracted by the control object i in each period; p i (t) is the active power of the controlled object i at time t; p i (t-1) is the active power of the controlled object i at time t-1.

[0085] The energy storage charging and discharging capacity constraints are:

[0086]

[0087] Where: i represents the i-th energy storage unit in the control object; n represents the number of continuous charge and discharge periods; E represents the upper limit of a single continuous charge and discharge amount.

[0088] The control object adjustment reserve constraint is:

[0089]

[0090]

[0091] Where: The upward reserve provided for adjustable resource i at time t; r′ i (t) is the downward reserve provided by adjustable resource i at time t; The upper limit of the reserve that can be provided by the adjustable resource i; It is the lower limit of downward reserve that can be provided by adjustable resource i.

[0092] In this embodiment, the control objects are grouped according to their distribution characteristics and the grid structure, each group of control objects is defined as a resource cluster, and constraint management is performed on a resource cluster basis to ensure the safety of related branch and section flows.

[0093] Grid security constraints include resource cluster power constraints and cluster regulation reserve constraints, as follows:

[0094] The power constraints of the resource cluster are:

[0095]

[0096] Where: I represents the resource cluster; H(t) , They represent the lower and upper constraints of the total output of the controlled objects in the cluster respectively.

[0097] The cluster adjustment standby constraints are:

[0098]

[0099]

[0100] Where: I represents the resource cluster; Indicates that the cluster has increased or decreased its standby constraints.

[0101] Cluster regulation reserve constraints will be used to reserve regulation margins in advance for certain heavy-load sections involved in real-time coordination strategies when the safety correction mode is enabled.

[0102] Example 2

[0103] In the provincial coordination mode, this embodiment provides a method for real-time coordinated control of source, grid, load and storage at the regional level, including the following steps:

[0104] S1. Taking the local regulation main transformer as the object, a number of control units are established according to the regional power grid topology structure, and each control unit includes a number of control objects distributed under the local regulation main transformer.

[0105] S2. Aggregate all control objects in the local dispatching system, establish an equivalent virtual generator model, and set the allocation ratio coefficient for the provincial dispatching and control equipment and each local dispatching equivalent virtual machine.

[0106] S3. According to the situation of ACE in the provincial dispatching sub-control area or the real-time regulation demand of the provincial power grid and the real-time status of the control objects in each local dispatching area, the total active regulation target value of the provincial power grid is allocated to the provincial dispatching and regulating equipment and each virtual generator according to the allocation ratio coefficient, and a remote regulation instruction is issued.

[0107] S4. For the local regulator that has not received the remote regulation command, the control object in the local regulator strictly implements the day-ahead operation curve.

[0108] S5. For the local regulator that receives the remote regulation command, the local regulator will decompose the active regulation target value allocated by the provincial power grid to the control unit that needs to be adjusted in the local regulator according to the actual status of the regional power grid, and then take the minimum regulation cost as the goal, consider the operation constraints of the control object and the power grid safety constraints, decompose the active regulation target value of the control unit to each control object therein, and correct the real-time active power of the control object that needs to be corrected, so as to achieve the provincial and local coordinated control goals.

[0109] In this embodiment, the provincial control and management equipment includes conventional units, centralized new energy stations and centralized energy storage power stations controlled by the provincial control and management.

[0110] In this embodiment, the operation constraints of the control object and the power grid security constraints are consistent with the operation constraints of the control object and the power grid security constraints described in Example 1, and are not repeated here.

[0111] Example 3

[0112] This embodiment provides a method for real-time coordinated control of regional-level source, grid, load and storage, which is applicable to non-market scenarios. The method provided in this embodiment can be operated in two basic control modes, namely, local control mode and provincial coordination mode. The specific operation modes of the two basic control modes can be referred to in Example 1 and Example 2, which will not be repeated here.

[0113] This embodiment is a real-time coordinated control method for regional-level sources, grids, loads and storage for non-market scenarios, and is elaborated in detail from three aspects: operation mode, implementation method of relevant constraints and instruction decomposition.

[0114] 1. Operation mode

[0115] The local dispatching system divides the control objects into two groups according to the evaluation results of the regional power grid operation; one group is the planned tracking group, in which the power grid flow in the electrical sub-district where the control objects are located is complex, and even some local equipment has exceeded the limit or is overloaded; the other group is the free adjustment group, in which the power grid flow in the electrical sub-district where the control objects are located is normal.

[0116] The control objects in the planned tracking group track the day-ahead operating curve. The control objects in the free regulation group are responsible for generating correction schemes or distributing the active power regulation target values ​​allocated by the provincial power grid. The regulation power allocation of the control objects in the free regulation group takes into account the regulation margin, regulation rate, and regulation cost factors, so as to achieve the provincial and local coordinated control goals on the basis of ensuring the safety of the regional power grid.

[0117] 2. Implementation methods of relevant constraints

[0118] The relevant constraints refer to the operation constraints of the control object and the power grid security constraints.

[0119] The safe operation of the regional power grid is the primary goal of real-time coordinated control and has the highest priority. Between the regulation needs of the regional power grid and the safe operation of the regional power grid, the safe and stable operation of the regional power grid should be guaranteed first, and then the execution effect of the regulation needs should be considered.

[0120] When certain control units within the regional power grid are in a heavy load condition, the control objects associated with these control units are prohibited from executing control instructions that deteriorate the status of these control units.

[0121] The equipment limit of the control object in the ground control supports multiple value sources, and each value source can be switched flexibly in real time. The value sources include manual settings and parameter libraries.

[0122] Manual setting: Controllers manually set equipment limits and can modify them in real time.

[0123] Parameter library: The value of the equipment limit comes from the corresponding PAS model parameter.

[0124] 3. Instruction decomposition

[0125] For the active regulation target value generated by the correction plan or distributed by the provincial power grid, the minimum regulation cost is taken as the goal and decomposed according to the weighted decomposition coefficient of the real-time adjustable potential of each controlled object. Among them, the decomposition coefficient comprehensively considers factors such as the regulation cost, electrical topology structure and regulation risk of the controlled object.

[0126] Example 4

[0127] This embodiment provides a method for real-time coordinated control of regional-level source, grid, load and storage, which is applicable to market scenarios. The method provided in this embodiment can be operated in two basic control modes, namely, local control mode and provincial coordination mode. The specific operation modes of the two basic control modes can be referred to in Example 1 and Example 2, which will not be repeated here.

[0128] This embodiment is a market-oriented method for real-time coordinated control of regional-level sources, networks, loads and storage, and further includes the following steps:

[0129] If the objects of control of the local dispatching and regulation participate in the relevant auxiliary service market of the province as a whole, the market players are regional source-grid-load-storage aggregates, which are uniformly cleared by the provincial dispatching market technical support system and the overall control targets of the regional source-grid-load-storage aggregates are issued. The local dispatching and regulation decomposes and controls the instructions in accordance with the overall control targets of the regional source-grid-load-storage aggregates, with reference to the declared data of each resource market and the real-time adjustable capacity, and taking into account the operating constraints and grid safety constraints of the control objects. During the day, each control object must strictly implement the clearing curve and cannot participate in free regulation.

[0130] If an abnormal situation occurs in the regional power grid during the operation of the market scenario, the safety correction auxiliary decision-making module will issue a strategy. The on-duty controller of the local dispatching department will apply to the provincial dispatching department to exit the market mode and manually exit the market mode. At this time, the automatic power generation control module will be adjusted according to the process of the local control mode, and the market scenario will be restored after the regional power grid resumes safe operation.

[0131] Example 5

[0132] This embodiment provides a real-time coordinated control system for regional-level sources, networks, loads and storage, including a relevant safety analysis module, a safety correction auxiliary decision module and an automatic power generation control module.

[0133] The relevant safety analysis module is used to achieve: calculating the equipment limit-exceeding information.

[0134] The safety correction auxiliary decision module is used to achieve: generating a correction plan.

[0135] The automatic power generation control module is used to achieve: taking the local regulation main transformer as the object, establishing a number of control units according to the regional power grid topology structure, each control unit respectively includes a number of control objects distributed under the local regulation main transformer; and

[0136] When an abnormal over-limit situation occurs in the regional power grid, based on the correction scheme, with the goal of minimizing the adjustment cost, taking into account the operation constraints of the control object and the safety constraints of the power grid, the active adjustment target value of the control unit is decomposed into each control object therein, and the real-time active power of the control object to be corrected is corrected to eliminate or alleviate the over-limit situation; or

[0137] All control objects in the local dispatch are aggregated to establish an equivalent virtual generator model, and the allocation ratio coefficient is set for the provincial dispatching and control equipment and each local dispatching equivalent virtual machine; according to the situation of the ACE of the provincial dispatching sub-control area or the real-time regulation demand of the provincial power grid and the real-time status of the control objects in each local dispatching, the total active regulation target value of the provincial power grid is allocated to the provincial dispatching and control equipment and each virtual generator according to the allocation ratio coefficient, and a remote regulation instruction is issued; for the local dispatching that has not received the remote regulation instruction, the control objects in the local dispatching strictly implement the day-ahead operation curve; for the local dispatching that has received the remote regulation instruction, the local dispatching will decompose the active regulation target value issued by the provincial power grid to the control unit that needs to be adjusted in the local dispatching according to the actual status of the regional power grid, and then take the minimum regulation cost as the goal, consider the operation constraints of the control object and the power grid safety constraints, decompose the active regulation target value of the control unit to each control object therein, and correct the real-time active power of the control object that needs to be corrected to achieve the provincial and local coordinated control goal.

[0138] The present invention provides a method and system for real-time coordinated control of regional sources, grids, loads and storage, which ensures the thermal stability and safety of regional power grids by accurately controlling the active power of centralized new energy stations, centralized energy storage power stations, virtual power plants, distributed energy, distributed energy storage, charging piles, flexible loads and other equipment. At the same time, various types of control objects are coordinated with conventional units to make full use of various types of control objects, reduce unnecessary adjustment actions of conventional units, meet the grid adjustment needs and improve the utilization rate of equipment. The present invention has a very far-reaching significance for promoting social and economic development and improving production levels.

[0139] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0140] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0141] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0142] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0143] In summary, the content of the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical guiding idea of ​​the present invention, but these embodiments are all included in the scope of the present invention.

Claims

1. A method for real-time coordinated control of regional source, grid, load and storage, characterized in that: The method operates in two basic control modes, which include a local control mode and a provincial and local coordination mode; In local control mode, the method comprises the following steps: Taking the local regulation main transformer as the object, a plurality of control units are established according to the regional power grid topology structure, and each of the control units includes a plurality of control objects distributed under the local regulation main transformer; Under normal circumstances, the control objects in the ground control strictly follow the day-ahead operation curve; After calculating the equipment over-limit information, a correction scheme is generated, which is the active power adjustment target value of the control unit that needs to be adjusted to solve the over-limit abnormality of the regional power grid. Then, with the minimum adjustment cost as the goal, the operation constraints of the control object and the power grid safety constraints are considered, and the active power adjustment target value of the control unit is decomposed into each of the control objects therein, and the real-time active power of the control object to be corrected is corrected to eliminate or alleviate the over-limit situation; In the land-saving coordination mode, the method comprises the following steps: Taking the local regulation main transformer as the object, a plurality of control units are established according to the regional power grid topology structure, and each of the control units includes a plurality of control objects distributed under the local regulation main transformer; Aggregate all the control objects in the local dispatching system, establish an equivalent virtual generator model, and set an allocation ratio coefficient for the provincial dispatching equipment and each local dispatching equivalent virtual machine; According to the situation of the ACE of the provincial control sub-control area or the real-time regulation demand of the provincial power grid and the real-time status of the control objects in each local control, the total active regulation target value of the provincial power grid is allocated to the provincial control control equipment and each virtual generator according to the allocation ratio coefficient, and a remote regulation instruction is issued; For the local regulator that has not received the remote regulation command, the control object in the local regulator strictly implements the day-ahead operation curve; For the local adjustment that receives the remote adjustment command, the local adjustment will decompose the active adjustment target value distributed by the provincial power grid to the control unit that needs to be adjusted in the local adjustment according to the actual status of the regional power grid, and then take the minimum adjustment cost as the goal, consider the operation constraints of the control object and the power grid safety constraints, decompose the active adjustment target value of the control unit to each of the control objects therein, and correct the real-time active power of the control object that needs to be corrected, so as to achieve the provincial and local coordinated control goals.

2. The method according to claim 1, characterized in that The provincial control and management equipment includes conventional units controlled by the province, centralized new energy stations and centralized energy storage power stations.

3. The method according to claim 1, characterized in that The control object operation constraints include control object operation range constraints, control object load regulation rate constraints, energy storage charge and discharge capacity constraints, and control object regulation reserve constraints, which are as follows: The operating range constraints of the control object are: p i,min u(i,t)≤p(i,t)≤p i,max u(i,t) Where: p i,min 、p i,max They represent the minimum and maximum active power of the control object i respectively; u(i, t) is the operating state of the control object i in time period t, 1 represents operation, and 0 represents shutdown; The load regulation rate constraint of the control object is: -Δ i ≤p i (t)-p i (t-1)≤Δ i Where: -Δ i is the minimum value of load that can be added or subtracted for the control object i in each period; Δ i is the maximum value of load that can be added or subtracted by the control object i in each period; p i (t) is the active power of the controlled object i at time t; p i (t-1) is the active power of the controlled object i at time t-1; The energy storage charge and discharge capacity constraint is: Where: i represents the i-th energy storage unit in the control object; n represents the number of continuous charge and discharge periods; E represents the upper limit of a single continuous charge and discharge amount; The control object adjusts the standby constraint as follows: r i ′ (t)≥ r i g Where: The upward reserve provided for adjustable resource i at time t; r i ′ (t) is the downward reserve provided by adjustable resource i at time t; The upper limit of the reserve that can be provided by the adjustable resource i; r i g It is the lower limit of downward reserve that can be provided by adjustable resource i.

4. The method according to claim 1, characterized in that: The control objects are grouped according to their distribution characteristics and the grid structure, each group of control objects is defined as a resource cluster, and constraint management is performed on a resource cluster basis to ensure the safety of related branch and section flows; The power grid security constraints include resource cluster power constraints and cluster regulation reserve constraints, which are as follows: The resource cluster power constraints are: Where: I represents the resource cluster; H(t) , They represent the lower and upper constraints of the total output of the control objects in the cluster respectively; The cluster adjustment standby constraint is: Where: I represents the resource cluster; r g (t) Indicates whether the cluster increases or decreases its standby constraints; The cluster regulation reserve constraint will be used for certain heavy-load sections involved in the real-time coordination strategy, and will reserve regulation margins in advance for them when the safety correction mode is enabled.

5. The method according to any one of claims 1 to 4, characterized in that This approach is applicable to non-market scenarios; The local dispatching system divides the control objects into two groups according to the evaluation results of the regional power grid operation. One group is the planned tracking group, in which the power grid flow of the electrical subdivision where the control objects are located is complex, and some local equipment has exceeded the limit or been overloaded. The other group is the free adjustment group, in which the power grid flow of the electrical subdivision where the control objects are located is normal. The control objects in the planned tracking group track the day-ahead operating curve, the control objects in the free regulation group are responsible for generating correction schemes or the active regulation target values ​​allocated by the provincial power grid, and the regulation power allocation of the control objects in the free regulation group takes into account the regulation margin, regulation rate, and regulation cost factors, so as to achieve the provincial and local coordinated control goals on the basis of ensuring the safety of the regional power grid.

6. The method according to any one of claims 1 to 4, characterized in that This approach is applicable to non-market scenarios; The safe operation of the regional power grid is the primary goal of real-time coordinated control and has the highest priority. Between the regulation needs of the regional power grid and the safe operation of the regional power grid, the safe and stable operation of the regional power grid should be ensured first, and then the execution effect of the regulation needs should be considered; When some control units within the regional power grid are in a heavy load condition, the control objects associated with these control units are prohibited from executing control instructions that deteriorate the status of these control units; The equipment limits of the control objects in the ground control support multiple sources of values, and each source of values ​​can be switched in real time. The value sources include manual settings and parameter libraries. The manually set values ​​of the equipment limits come from the equipment limits manually set by the control personnel and can be modified in real time. The parameter library values ​​of the equipment limits come from the corresponding PAS model parameters.

7. The method according to any one of claims 1 to 4, characterized in that This approach is applicable to non-market scenarios; For the active regulation target value generated by the correction plan or distributed by the provincial power grid, the minimum regulation cost is taken as the goal and decomposed according to the weighted decomposition coefficient of the real-time adjustable potential of each controlled object, wherein the decomposition coefficient comprehensively considers the regulation cost, electrical topology structure and regulation risk factors of the controlled object.

8. The method according to any one of claims 1 to 4, characterized in that The methodology is applicable to market scenarios and also includes the following steps: If the objects under the control of the local dispatching and regulation participate in the relevant auxiliary service market of the province as a whole, the market players are the regional source-grid-load-storage aggregates, which are uniformly cleared by the provincial dispatching market technical support system and the overall control target of the regional source-grid-load-storage aggregates is issued. The local dispatching and regulation shall decompose and control the instructions according to the overall control target of the regional source-grid-load-storage aggregates, refer to the declared data of each resource market and the real-time adjustable capacity, and consider the operation constraints and grid security constraints of the control objects. Each control object shall strictly implement the clearing curve within the day and cannot participate in free regulation. If an abnormal situation occurs in the regional power grid during the operation of the market scenario, the safety correction auxiliary decision-making module will issue a strategy. The on-duty controller of the local dispatching department will apply to the provincial dispatching department to exit the market mode and manually exit the market mode. At this time, the automatic power generation control module will be adjusted according to the process of the local control mode, and the market scenario will be restored after the regional power grid resumes safe operation.

9. A real-time coordinated control system for regional source, grid, load and storage, characterized in that: Including relevant safety analysis module, safety correction auxiliary decision module and automatic power generation control module; The related safety analysis module is used to achieve: calculating the equipment over-limit information; The safety correction auxiliary decision module is used to achieve: generating a correction plan; The automatic power generation control module is used to achieve: taking the local regulation main transformer as the object to establish a plurality of control units according to the regional power grid topology structure, each of the control units respectively includes a plurality of control objects distributed under the local regulation main transformer; as well as When an abnormal over-limit situation occurs in the regional power grid, based on a correction scheme, with the goal of minimizing the adjustment cost, and taking into account the operation constraints of the control object and the safety constraints of the power grid, the active adjustment target value of the control unit is decomposed into each of the control objects therein, and the real-time active power of the control object to be corrected is corrected to eliminate or alleviate the over-limit situation; or All the control objects in the local dispatch are aggregated to establish an equivalent virtual generator model, and the allocation ratio coefficient is set for the provincial dispatching and regulating equipment and each local dispatching equivalent virtual machine; according to the situation of the ACE of the provincial dispatching sub-control area or the real-time regulation demand of the provincial power grid and the real-time status of the control objects in each local dispatching, the total active regulation target value of the provincial power grid is allocated to the provincial dispatching and regulating equipment and each virtual generator according to the allocation ratio coefficient, and a remote regulation instruction is issued; for the local dispatching that has not received the remote regulation instruction, the control objects in the local dispatching strictly implement the day-ahead operation curve; for the local dispatching that has received the remote regulation instruction, the local dispatching decomposes the active regulation target value issued by the provincial power grid to the control unit that needs to be adjusted in the local dispatching according to the actual status of the regional power grid, and then takes the minimum regulation cost as the goal, considers the operation constraints of the control object and the power grid safety constraints, decomposes the active regulation target value of the control unit to each of the control objects therein, and corrects the real-time active power of the control object that needs to be corrected to achieve the provincial and local coordinated control goal.

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