Configuration optimization method and system for system regulation resources in isolated network system
Patent Information
- Application Number
- CN202510931565.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-07
- Publication Date
- 2025-11-07
Smart Images
Figure CN120914742A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of isolated grid system control, and particularly relates to a configuration optimization method and system of system regulation resources in an isolated grid system. BACKGROUND
[0002] As a micro-grid separated from the large power grid, the isolated grid has the characteristics of small overall capacity, single-machine capacity accounting for no more than 8% of the total capacity of the power grid, limited rotational inertia and thermal potential reserve, weak system disturbance resistance, direct impact of load change on voltage and frequency stability, easy to cause frequency collapse or voltage collapse due to active power imbalance, and long recovery time. In view of the above problems existing in the operation of the isolated grid, the existing technology usually uses electrochemical energy storage or electric load balancing device or both as auxiliary operation means of the isolated grid system. When the isolated grid system fluctuates, the regulation capacity of the generator set, the electrochemical energy storage and the electric load balancing device is used to maintain the stability of the isolated grid system and avoid system collapse.
[0003] The existing technology using electrochemical energy storage and electric load balancing device as auxiliary regulation means of the isolated grid usually selects the maximum value of the extreme working condition power and the electric quantity in the configuration of the capacity of the electrochemical energy storage and the power and capacity of the electric load balancing device. Although this configuration method can meet the requirements of system stability regulation, it has the problem of unreasonable configuration, which often leads to excessive capacity of the auxiliary regulation device and the standby capacity of the unit, greatly increasing the construction cost.
[0004] Therefore, it is urgent to provide a configuration optimization method and system of system regulation resources in an isolated grid system to reasonably configure the capacity of the system regulation resources composed of electrochemical energy storage devices, electric load balancing devices and generator sets, avoid excessive capacity and reduce construction cost. SUMMARY
[0005] Therefore, it is necessary to provide a configuration optimization method and system of system regulation resources in an isolated grid system to solve the technical problem in the prior art that the capacity configuration of the system regulation resources is determined according to the maximum value of the extreme working condition power and the electric quantity, resulting in excessive capacity configuration and high construction cost.
[0006] In a first aspect, the present application provides a configuration optimization method of system regulation resources in an isolated grid system, the system regulation resources including a generator set, an electrochemical energy storage device and an electric load balancing device, and the method comprising: classifying the electric load in multiple levels according to the power supply reliability requirement of the load, the load fluctuation characteristics and the load adjustable characteristics to obtain multiple classified loads and load power of each of the classified loads; determining multiple constraint conditions meeting power and energy balance under different operating conditions based on the load power; A target function is established with the minimum total cost of investment of the system regulation resource as a target, and the target function is solved with the constraint conditions as capacity configuration boundary conditions to obtain the configuration capacity of the generator unit, the electrochemical energy storage device and the electric load balancing device.
[0007] In some possible implementation manners, the power consumption load is classified in multiple levels according to the load power supply reliability requirement, the load fluctuation characteristic and the load adjustable characteristic, including: The power consumption load is divided into a first level based on the load power supply reliability requirement to obtain a plurality of first level loads; Each of the first level loads is divided into a second level based on the load fluctuation characteristic to obtain a plurality of second level loads; Each of the second level loads is divided into a third level based on the load adjustable characteristic to obtain a plurality of third level loads.
[0008] In some possible implementation manners, the operation permission of the first level load is higher than that of the second level load, and the operation permission of the second level load is higher than that of the third level load.
[0009] In some possible implementation manners, the first level load includes a first level load, a second level load and a third level load, the second level load includes a first level stability load and a first level impact load corresponding to the first level load, a second level stability load and a second level impact load corresponding to the second level load, and a third level stability load and a third level impact load corresponding to the third level load, and the third level load includes a first level stability adjustable load and a first level stability non-adjustable load corresponding to the first level stability load, a first level impact adjustable load and a first level impact non-adjustable load corresponding to the first level impact load, a second level stability adjustable load and a second level stability non-adjustable load corresponding to the second level stability load, a second level impact adjustable load and a second level impact non-adjustable load corresponding to the second level impact load, a third level stability adjustable load and a third level stability non-adjustable load corresponding to the third level stability load, and a third level impact adjustable load and a third level impact non-adjustable load corresponding to the third level impact load.
[0010] In some possible implementation manners, the constraint conditions include a capacity constraint of the generator unit and a speed regulation performance constraint of the generator unit; The capacity constraint of the generator unit is: P G.Total.max ≥A×(P Ls +P Li.max -P S ) The speed regulation performance constraint of the generator unit is: V G ≤B×P G.Toatal.max wherein P G.Total.max is the maximum value of the total power of the generator set; A is the reserve capacity coefficient; P Ls is the power of the stability load; P Li.max is the maximum value of the power of the impact load; P S is the instantaneous power of the electrochemical energy storage device; V G is the actual regulation rate of the generator set; and B is the comprehensive regulation coefficient of the generator set.
[0011] In some possible implementations, the constraint conditions further include a load increase rate constraint and a load decrease rate constraint. The load increase rate constraint is: V Gr.max +V S.max ≥V Lir.max +V Lsr.max The load decrease rate constraint is: P R.max +P S.max ≥P Ld.max wherein V Gr.max is the maximum value of the load increase rate of the generator set; V S.max is the maximum value of the power change rate of the electrochemical energy storage device; V Lir.max is the maximum value of the load increase rate of the impact load; V Lsr.max is the maximum value of the load increase rate of the stability load; P R.max is the maximum value of the instantaneous power of the electrical load balancing device; P S.max is the maximum value of the instantaneous power of the electrochemical energy storage device; and P Ld.max is the maximum value of the power of the total load drop.
[0012] In some possible implementations, the constraint conditions further include an instantaneous power constraint of the electrochemical energy storage device, a capacity constraint of the electrochemical energy storage device during normal operation, and a capacity constraint of the electrochemical energy storage device when a single generator fails to exit. The instantaneous power constraint of the electrochemical energy storage device is: P S ≥P G.single.max -P L3 -P L2.a The capacity constraint of the electrochemical energy storage device during normal operation is:
[0013] When a single generator with the highest power output fails and goes out of service, the capacity constraint of the electrochemical energy storage device is:
[0014] In the formula, P S P represents the instantaneous power of the electrochemical energy storage device. G.single.max P represents the maximum power of a single generator in the generator set. L3 Power for a level 3 load; P L2.a The power of the adjustable secondary load; For T n-1 To T n The amount of electricity that the electrochemical energy storage device needs to provide or absorb within a given time period; P Li Power of impact load; T represents the continuous operating power of the generator set during normal system operation; T is the duration of a typical complete production cycle. The required capacity of the electrochemical energy storage device for normal system operation; The required capacity of the electrochemical energy storage device when a single generator with the maximum generating capacity fails and goes out of service; T F The duration of the fault state; The load regulation rate of the remaining generator sets when a single generator with the maximum generating capacity fails and is taken out of service; The adjustment rate of the remaining adjustable load in the system when a single generator with the maximum generating capacity fails and goes out of service.
[0015] In some possible implementations, the constraints also include a charge / discharge ratio constraint on the energy storage battery in the electrochemical energy storage device, wherein the charge / discharge ratio constraint is as follows:
[0016] In the formula, β is the capacity margin coefficient of the electrochemical energy storage device, and K is the charge / discharge rate of the electrochemical energy storage device.
[0017] In some possible implementations, the objective function is: CT total =CT G ×(P G.Total.max -P G.con )+CT S ×C S +CT S ×P R In the formula, CT total The total investment cost of system regulation resources required to ensure stable operation of an isolated network system; CT G The unit power investment cost of the generator set; CT SInvestment cost per unit capacity of the electrochemical energy storage device; CT S Investment cost per unit power of the electric load balancing device; P G.Total.max Maximum value of the total power of the generator set; Continuous operation power of the generator set when the system is in normal operation; the sum of the capacity of the electrochemical energy storage device configured when the system is in normal operation and the capacity of the electrochemical energy storage device configured when the maximum power of the generator fails; P R Instantaneous power of the electric load balancing device.
[0018] In a second aspect, the present application further provides a configuration optimization system of system regulation resources in an isolated network system, the system regulation resources including a generator set, an electrochemical energy storage device and an electric load balancing device, and the system includes: A load classification unit is configured to classify the electric load in multiple levels according to the power supply reliability requirement, the load fluctuation characteristics and the load adjustable characteristics of the load, to obtain multiple classified loads and load power of each of the classified loads; A constraint condition determination unit is configured to determine multiple constraint conditions meeting the power and energy balance under different operating conditions based on the load power; A configuration capacity determination unit is configured to take the minimum total investment cost of the system regulation resources as a target, to establish a target function, and to solve the target function by taking the constraint conditions as capacity configuration boundary conditions, to obtain the configuration capacity of the generator set, the electrochemical energy storage device and the electric load balancing device.
[0019] The beneficial effects of the above implementation manner are that: the configuration optimization method of system regulation resources in an isolated network system provided by the present application firstly classifies the electric load in multiple levels based on the power supply reliability requirement, the load fluctuation characteristics and the load adjustable characteristics, so that each type of load includes the three attributes of power supply reliability requirement, load fluctuation characteristics and load adjustable characteristics, and the electric load can be monitored and controlled according to the three attributes. Secondly, multiple constraint conditions are determined based on the load power of the classified loads, so that the capacity configuration process of the system regulation resources fully considers different types of loads, that is, the capacity configuration under different operating conditions is allocated on demand, compared with the extreme condition method in the prior art, the resources can be reasonably utilized, the capacity size is significantly reduced, and the investment cost of the system regulation resources is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments description. Obviously, the drawings in the following description only show some embodiments of the present application, and based on the drawings, all other drawings obtained by those skilled in the art without creative effort should be within the protection scope of the present application.
[0021] Figure 1 An embodiment flowchart of the method for configuring and optimizing system regulation resources in the isolated network system provided by the present application is shown in the figure. Figure 2 An embodiment flowchart of S101 in the present application is shown in the figure. Figure 1 Figure 3 An embodiment structure diagram of the multi-level classification load provided by the present application is shown in the figure. Figure 4 An embodiment diagram of the electric quantity provided or absorbed by the electrochemical energy storage device in a complete production cycle provided by the present application is shown in the figure. Figure 5 An embodiment structure diagram of the configuration and optimization system of the system regulation resources in the isolated network system provided by the present application is shown in the figure. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should be within the protection scope of the present application.
[0023] It should be understood that the schematic drawings are not drawn according to the actual proportions. The flowchart used in the present application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowchart or removed from the flowchart by those skilled in the art under the guidance of the content of the present application. Some block diagrams shown in the drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.
[0024] The terms "first", "second", and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the descriptive terms "first", "second", etc., are to be interpreted, by those skilled in the art, as a non-limited form of description used to distinguish a specific element from another, but not by way of limitation of the possible implicit inductivity of such in the context of the several embodiments.
[0025] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments in various ways.
[0026] The application provides a configuration optimization method and system of system regulation resources in an isolated grid system.
[0027] Before the specific embodiments are displayed, it is first necessary to state that: the system regulation resources include generator units, electrochemical energy storage devices, and electrical load balancing devices. The generator units are used to provide basic power and inertia, the electrochemical energy storage devices provide extremely fast power response, and can instantaneously absorb or release power to suppress frequency fluctuations, and the electrical load balancing devices ensure load balancing by quickly removing non-critical loads or putting in adjustable loads. That is: the system regulation resources are used to regulate the power balance and stable operation of the isolated grid system.
[0028] Figure 1 An embodiment flowchart of the configuration optimization method of system regulation resources in an isolated grid system proposed by the embodiments of the application is shown in FIG. 1, which includes the following steps. Figure 1 The configuration optimization method of system regulation resources in an isolated grid system includes the following steps. S101, multi-level classification is performed on the electrical loads according to the power supply reliability requirements of the loads, the load fluctuation characteristics, and the load adjustable characteristics, to obtain a plurality of classified loads and load powers of the classified loads.
[0029] The power supply reliability requirements of the loads are indexes for evaluating whether the outage of the loads will affect the production system, the load fluctuation characteristics are indexes for describing the variation law of the load power with time, and the load adjustable characteristics are indexes for evaluating whether the time sequence adjustment of the loads will affect the production system.
[0030] It should be understood that: the load power of the classified load is the sum of the powers of all electrical loads under the classified load.
[0031] S102, a plurality of constraint conditions for meeting power and energy balance under different operating conditions are determined based on the load power.
[0032] It should be noted that different operating conditions refer to different types of loads in step S101.
[0033] S103, taking the minimum total cost of investment of system regulation resources as the target, establishing a target function, and solving the target function with the constraint condition as the capacity configuration boundary condition to obtain the configuration capacity of the generator set, the electrochemical energy storage device and the electric load balancing device.
[0034] It should be noted that the solving method of the target function can be any one of the existing solving methods, which is not limited here.
[0035] It should be understood that the configuration optimization method of system regulation resources in the isolated network system in the embodiment of the application can be implemented in any device based on the configuration optimization method of system regulation resources in the isolated network system, such as an electronic device on the control side of the isolated network system. Specifically, the configuration optimization method of system regulation resources in the isolated network system is stored in the above-mentioned device in the form of a prepared program, and when the device starts, the program is called, and the configuration optimization method of system regulation resources in the isolated network system is implemented.
[0036] Compared with the prior art, the configuration optimization method of system regulation resources in the isolated network system provided by the embodiment of the application first classifies the electric load in multiple levels based on the power supply reliability requirement, the load fluctuation characteristic and the load adjustable characteristic, so that each type of load includes the three attributes of power supply reliability requirement, load fluctuation characteristic and load adjustable characteristic, and then the electric load can be monitored and controlled according to the three attributes. Secondly, a plurality of constraint conditions are determined based on the load power of the classified load, which realizes full consideration of different types of loads in the capacity configuration process of system regulation resources, that is, realizes on-demand allocation of capacity configuration under different operating conditions. Compared with the extreme condition method in the prior art, the method can realize reasonable utilization of resources, significantly reduce the capacity size, and further reduce the investment cost of system regulation resources.
[0037] In specific embodiments of the application, as shown in Figure 2 , step S101 includes: S201, based on the power supply reliability requirement of the load, the electric load is divided into a first level to obtain a plurality of first level loads.
[0038] In specific embodiments of the application, as shown in Figure 3 , the first level load includes a first level load L1, a second level load L2 and a third level load L3, and the calculation power of each type of load is calculated respectively as P L1 , P L2 and P L3 .
[0039] The first-level load is a load that may affect the normal service life of equipment, causes production to stop or a large amount of power generation to decrease due to short-time power failure; the second-level load is a load that allows short-time power failure, but the long-time power failure may affect the normal service life of equipment or normal production; and the third-level load is a load that does not directly affect production due to long-time power failure.
[0040] S202, performing second-level division on each first-level load based on the load fluctuation characteristics, to obtain a plurality of second-level loads.
[0041] In specific embodiments of the present application, as shown in FIG. 2, Figure 3 The second-level load includes a first-level stability load and a first-level impact load corresponding to the first-level load, a second-level stability load and a second-level impact load corresponding to the second-level load, and a third-level stability load and a third-level impact load corresponding to the third-level load.
[0042] It should be understood that: the stability load is a load whose load power change amount in unit time under normal working condition is less than or equal to a preset power; and the impact load is a load whose load power change amount in unit time under normal working condition is greater than the preset power.
[0043] The preset power is determined by the rated power, and specifically, the preset power is a preset percentage of the rated power. The percentage is negatively correlated with the proportion of the maximum value of the impact load power of the isolated network system in the total load power. Meanwhile, the value of X can be used to measure the type of the isolated network system. The greater the value of X, the more stability loads the isolated network system has, and the isolated network system belongs to a load stability type; the smaller the value of X, the more impact loads the isolated network system has, and the isolated network system belongs to a load impact type.
[0044] S203, performing third-level division on each second-level load based on the load adjustable characteristics, to obtain a plurality of third-level loads.
[0045] In specific embodiments of the present application, as shown in FIG. 3, Figure 3 The third-level load includes a first-level stability adjustable load and a first-level stability non-adjustable load corresponding to the first-level stability load, a first-level impact adjustable load and a first-level impact non-adjustable load corresponding to the first-level impact load, a second-level stability adjustable load and a second-level stability non-adjustable load corresponding to the second-level stability load, a second-level impact adjustable load and a second-level impact non-adjustable load corresponding to the second-level impact load, a third-level stability adjustable load and a third-level stability non-adjustable load corresponding to the third-level stability load, and a third-level impact adjustable load and a third-level impact non-adjustable load corresponding to the third-level impact load.
[0046] Specifically, the adjustable load is a load that can be operated in a time sequence adjustment manner or a load that adjustment of which will not affect the main production or has a small effect on the main production system; the non-adjustable load is a load that adjustment of which will have a large effect on the main production system.
[0047] In actual application, there can be a scenario of operating different levels of power loads respectively, to avoid conflicts, in specific embodiments of the present application, the operation permission of the first level load is higher than that of the second level load, and the operation permission of the second level load is higher than that of the third level load.
[0048] In other words, when operating the load of a higher level, the low permission attribute restriction of the low level load will be directly ignored.
[0049] In an actual application scenario, the maximum configuration capacity of the generator set should meet the maximum fluctuation of the impact load minus the capacity of the electrochemical energy storage device, in specific embodiments of the present application, the constraint conditions include a capacity constraint of the generator set; The capacity constraint of the generator set is: P G.Total.max ≥A×(P Ls +P Li.max -P S ) In the formula, P G.Total.max is the maximum value of the total power of the generator set; A is a standby capacity coefficient; P Ls is the power of the stability load; P Li.max is the maximum value of the power of the impact load; and P S is the instantaneous power of the electrochemical energy storage device.
[0050] Further, in addition to the capacity constraint, in some embodiments of the present application, the constraint conditions also include a speed regulation performance constraint of the generator set, which is used to ensure the comprehensive speed regulation performance of the various types of generators in the generator set to the outside, specifically, the speed regulation performance constraint of the generator set is: V G ≤B×P G.Toatal.max In the formula, V G is the actual regulation speed of the generator set; and B is a comprehensive speed regulation coefficient of the generator set.
[0051] To meet the demand of power dynamic balance of the isolated grid system, the power of the isolated grid system needs to have a response capability not lower than the load surge when all power loads surge, therefore, in specific embodiments of the present application, the constraint conditions also include a load increase rate constraint and a load decrease rate constraint; The load increase rate constraint is: V Gr.max +V S.max ≥VLir.max +V Lsr.max V Gr.max is the maximum value of the load increase rate of the generator set; V S.max is the maximum value of the power change rate of the electrochemical energy storage device; V Lir.max is the maximum value of the load increase rate of the impact load; V Lsr.max is the maximum value of the load increase rate of the stability load.
[0052] In an actual scenario, the most extreme case of load decrease should be when a large amount of load is instantaneously lost due to a fault of an isolated grid system, and balance is still achieved, that is, the constraint condition also includes a load decrease rate constraint, and the load decrease rate constraint is: V R.max +V S.max ≥V Ld.max V R.max is the maximum value of the power change rate of the electrical load balancing device; V Ld.max is the maximum value of the load decrease rate presented to the outside by the total load.
[0053] In this working condition, the input of the electrical load balancing device and the electrochemical energy storage device is instantaneously completed, and the shortage of the load is instantaneously reduced due to the fault, so that the integral of the above formula can be obtained:
[0054] After arrangement, the load decrease rate constraint is specifically: P R.max +P S.max ≥P Ld.max P R.max is the maximum value of the instantaneous power of the electrical load balancing device; P S.max is the maximum value of the instantaneous power of the electrochemical energy storage device; P Ld.max is the maximum value of the power of the total load.
[0055] In addition to the above constraint conditions, in specific embodiments of the present application, the constraint conditions also include an instantaneous power constraint of the electrochemical energy storage device, a capacity constraint of the electrochemical energy storage device during normal operation, and a capacity constraint of the electrochemical energy storage device when a single maximum power generator fails to exit; The instantaneous power constraint of the electrochemical energy storage device is: P S ≥P G.single.max -P L3 -P L2.a The capacity constraint of the electrochemical energy storage device during normal operation is:
[0056] The capacity constraint of the electrochemical energy storage device when a single generator with maximum power fails is:
[0057] wherein P S is the instantaneous power of the electrochemical energy storage device; P G.single.max is the maximum power of a single generator in the generator set; P L3 is the power of the tertiary load; P L2.a is the power of the adjustable secondary load; is T n-1 to T n , n is an integer greater than or equal to 1; P Li is the power of the impact load; is the continuous operation power of the generator set when the system is in normal operation; T is the length of a typical complete production cycle; is the capacity of the electrochemical energy storage device required when the system is in normal operation; is the capacity of the electrochemical energy storage device required when a single generator with maximum power fails; T F is the duration of the fault state; is the load adjustment rate of the remaining generator set when a single generator with maximum power fails; is the adjustment rate of the remaining adjustable load of the system when a single generator with maximum power fails.
[0058] In specific embodiments of the present application, T n-1 to T n , the amount of electricity that the electrochemical energy storage device needs to provide or absorb within the time is as shown in Figure 4 , wherein Figure 4 the amount of electricity above the ordinate is the amount of electricity that needs to be provided, and the amount of electricity below the ordinate is the amount of electricity that needs to be absorbed.
[0059] In specific embodiments of the present application, the constraint condition further includes a charge-discharge multiple constraint of the energy storage battery in the electrochemical energy storage device, and the charge-discharge multiple constraint condition is:
[0060] wherein β is a capacity margin coefficient of the electrochemical energy storage device, and is greater than or equal to 1, and K is a charge-discharge rate of the electrochemical energy storage device.
[0061] In specific embodiments of the present application, the objective function is: CT total = CT G × (P G.Total.max - P G.con ) + CTS x C S + C T S x P R In the formula, CT total is the total investment cost of the system regulation resources that the isolated grid system needs to increase to ensure stable operation of the system; CT G is the unit power investment cost of the generator set; CT S is the unit capacity investment cost of the electrochemical energy storage device; CT S is the unit power investment cost of the electric load balancing device; P G.Total.max is the maximum value of the total power of the generator set; is the continuous operation power of the generator set when the system is in normal operation; is the sum of the capacity of the electrochemical energy storage device that needs to be configured when the system is in normal operation and the capacity of the electrochemical energy storage device that needs to be configured when a single generator with the maximum power fails; P R is the instantaneous power of the electric load balancing device.
[0062] In summary, the configuration optimization method of the system regulation resources in the isolated grid system provided in the embodiments of the present application classifies the loads according to the reliability requirements for power supply, the load fluctuation characteristics and the load regulation characteristics of the loads in the isolated grid, divides the loads into three levels, divides all the electric loads into 12 types after the classification of the loads in the three levels, and each type of load contains three attributes for accurately monitoring and controlling each type of load in the stable regulation process of the isolated grid. The power and energy balance of the power grid under different operating conditions of the system are analyzed, the constraint conditions required to meet the power and energy balance under different operating conditions are obtained, and the power balance constraint condition and the energy balance constraint condition jointly constitute the boundary range of the objective function. The mathematical model of the investment cost of the auxiliary regulation of the system composed of the generator set, the electrochemical energy storage device and the electric load balancing device is constructed by taking each constraint condition as the boundary condition for the capacity configuration of the generator set, the electrochemical energy storage device and the electric load balancing device, the optimal configuration capacity of the generator set, the electrochemical energy storage device and the electric load balancing device is obtained by using the corresponding solving method to analyze and solve the model when the investment cost of the system regulation resources reaches the minimum value, and the capacity size is greatly reduced, thereby reducing the investment cost.
[0063] In order to better implement the configuration optimization method of the system regulation resources in the isolated grid system in the embodiments of the present application, on the basis of the configuration optimization method of the system regulation resources in the isolated grid system, the embodiments of the present application also provide a configuration optimization system of the system regulation resources in the isolated grid system. The system regulation resources include a generator set, an electrochemical energy storage device and an electric load balancing device, as shown in Figure 5 FIG. 1, the configuration optimization system 500 of the system regulation resources in the isolated grid system includes: The load classification unit 501 is configured to classify the power consumption load according to the power supply reliability requirement, the load fluctuation characteristics and the load adjustable characteristics, to obtain a plurality of classified loads and load power of each classified load. The constraint condition determination unit 502 is configured to determine a plurality of constraint conditions meeting the power balance under different operation conditions based on the load power. The configuration capacity determination unit 503 is configured to take the minimum total investment cost of the system adjustment resource as a target, to establish a target function, and to solve the target function by taking the constraint condition as a capacity configuration boundary condition, to obtain the configuration capacity of the generator set, the electrochemical energy storage device and the electric load balancing device.
[0064] The configuration optimization system 500 of the system adjustment resource in the islanded power system provided by the above embodiment can implement the technical solutions described in the configuration optimization method embodiment of the system adjustment resource in the islanded power system, and the principles of the implementation of the above modules or units can be referred to the corresponding content in the configuration optimization method embodiment of the system adjustment resource in the islanded power system, which will not be described here.
[0065] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program to instruct the relevant hardware (such as a processor, a controller, etc.) to complete, and the computer program can be stored in a computer readable storage medium. The computer readable storage medium is a disk, an optical disk, a read-only memory or a random access memory, etc.
[0066] The configuration optimization method and system of the system adjustment resource in the islanded power system provided by the present application are described in detail above, and the principle and implementation mode of the present application are described by applying specific examples. The above embodiment is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.
Claims
1. A method for configuration optimization of system regulation resources in an isolated grid system, characterized in that, The system regulation resources include a generator set, an electrochemical energy storage device, and an electric load balancing device, and the method comprises: According to the power supply reliability requirement of the load, the load fluctuation characteristics, and the load adjustable characteristics, the electric load is classified in multiple levels to obtain multiple classified loads and load powers of each classified load; Based on the load powers, multiple constraint conditions for meeting power balance under different operating conditions are determined; With the minimum total investment cost of the system regulation resources as the target, a target function is established, and the target function is solved with the constraint conditions as capacity configuration boundary conditions to obtain the configuration capacity of the generator set, the electrochemical energy storage device, and the electric load balancing device.
2. The method of claim 1, wherein the system regulation resource is configured in the island system. According to the power supply reliability requirement of the load, the load fluctuation characteristics, and the load adjustable characteristics, the electric load is classified in multiple levels, which comprises: Based on the power supply reliability requirement of the load, the electric load is divided in a first level to obtain multiple first-level loads; Based on the load fluctuation characteristics, each first-level load is divided in a second level to obtain multiple second-level loads; Based on the load adjustable characteristics, each second-level load is divided in a third level to obtain multiple third-level loads.
3. The method of claim 2, wherein the system regulation resource is configured in the island system. The operation authority of the first-level load is higher than that of the second-level load, and the operation authority of the second-level load is higher than that of the third-level load.
4. The method of claim 2, wherein the system regulation resource is configured in the island system. The first-level load comprises a primary load, a secondary load, and a tertiary load, the second-level load comprises a primary stability load and a primary impact load corresponding to the primary load, a secondary stability load and a secondary impact load corresponding to the secondary load, and a tertiary stability load and a tertiary impact load corresponding to the tertiary load, and the third-level load comprises a primary stability adjustable load and a primary stability non-adjustable load corresponding to the primary stability load, a primary impact adjustable load and a primary impact non-adjustable load corresponding to the primary impact load, a secondary stability adjustable load and a secondary stability non-adjustable load corresponding to the secondary stability load, a secondary impact adjustable load and a secondary impact non-adjustable load corresponding to the secondary impact load, a tertiary stability adjustable load and a tertiary stability non-adjustable load corresponding to the tertiary stability load, and a tertiary impact adjustable load and a tertiary impact non-adjustable load corresponding to the tertiary impact load.
5. The method of claim 4, wherein the system regulation resource is configured in the island system. The constraint conditions comprise a capacity constraint of the generator set and a speed regulation performance constraint of the generator set; The capacity constraint of the generator set is: P G.Total.max ≥ A x (P Ls + P Li.max - P S ) The speed regulation performance constraint of the generator set is: V G ≤ B x P G.Toatal.max where P G.Total.max is the maximum value of the total power of the generator set; A is the reserve capacity coefficient; P Ls is the stability load power; P Li.max is the maximum value of the impact load power; P S is the instantaneous power of the electrochemical energy storage device; V G is the actual regulation rate of the generator set; B is the comprehensive speed regulation coefficient of the generator set.
6. The method of claim 5, wherein the system regulation resource is configured in the island system. The constraint conditions further comprise a load increase rate constraint and a load decrease rate constraint; The load increase rate constraint is: V Gr.max +V S.max ≥V Lir.max +V Lsr.max The load decrease rate constraint is: P R.max +P S.max ≥P Ld.max where V Gr.max is the maximum ramp rate of the generator set; V S.max is the maximum power change rate of the electrochemical energy storage device; V Lir.max is the maximum ramp rate of the impulsive load; V Lsr.max is the maximum ramp rate of the steady load; P R.max is the maximum instantaneous power of the electrical load balancing device; P S.max is the maximum instantaneous power of the electrochemical energy storage device; P Ld.max is the maximum power of the total load drop.
7. The method of claim 6, wherein the system regulation resource is configured in the island system. The constraint conditions further comprise a transient power constraint of the electrochemical energy storage device, a capacity constraint of the electrochemical energy storage device during normal operation, and a capacity constraint of the electrochemical energy storage device when a single maximum power generator fails to exit; The transient power constraint of the electrochemical energy storage device is: P S ≥P G.single.max -P L3 -P L2.a The capacity constraint of the electrochemical energy storage device during normal operation is: When a single largest power generation generator fails to exit, the capacity constraint of the electrochemical energy storage device is: where P S is the instantaneous power of the electrochemical energy storage device; P G.single.max is the maximum power of a single generator in the generator set; P L3 is the power of the tertiary load; P L2.a is the power of the adjustable secondary load; is the T n-1 to T n is the amount of electricity that the electrochemical energy storage device needs to provide or absorb in T Li is the power of the impact load; is the continuous operation power of the generator set when the system is in regular operation; T is the length of a typical complete production cycle; is the capacity that the electrochemical energy storage device needs to configure when the system is in regular operation; is the capacity that the electrochemical energy storage device needs to configure when a single generator with maximum power fails to operate; T F is the duration of the fault state; is the load adjustment rate of the remaining generator set when a single generator with maximum power fails to operate; is the adjustment rate of the remaining adjustable load of the system when a single generator with maximum power fails to operate.
8. The method of claim 7, wherein the system regulation resource is configured in the island system. The constraint condition also includes the charge-discharge multiple constraint of the energy storage battery in the electrochemical energy storage device, and the charge-discharge multiple constraint condition is: In the formula, β is the capacity margin coefficient of the electrochemical energy storage device, and K is the charge-discharge rate of the electrochemical energy storage device.
9. The method of claim 1, wherein the system regulation resource is configured in the island system. The target function is: CT total = CT G x (P G.Total.max - P G.con ) + CT S x C S + CT S x P R In the formula, CT total is the total investment cost of the system regulation resources needed to ensure stable operation of the isolated grid system; CT G is the unit power investment cost of the generator set; CT S is the unit capacity investment cost of the electrochemical energy storage device; CT S is the unit power investment cost of the electric load balancing device; P G.Total.max is the maximum value of the total power of the generator set; is the continuous operation power of the generator set when the system is in normal operation; is the sum of the capacity of the electrochemical energy storage device needed when the system is in normal operation and the capacity of the electrochemical energy storage device needed when a single generator with the maximum power fails; P R is the instantaneous power of the electric load balancing device.
10. A system for configuration optimization of system regulation resources in an isolated grid system, characterized in that, The system regulation resources include generator sets, electrochemical energy storage devices and electric load balancing devices, and the system comprises: A load classification unit is configured to classify the electric loads in multiple levels according to the power supply reliability requirements of the loads, the load fluctuation characteristics and the load adjustable characteristics, to obtain multiple classified loads and load powers of the classified loads; A constraint condition determination unit is configured to determine multiple constraint conditions meeting the power and energy balance under different operating conditions based on the load powers; A configuration capacity determination unit is configured to take the minimum total investment cost of the system regulation resources as a target, to establish a target function, and to solve the target function by taking the constraint conditions as capacity configuration boundary conditions, to obtain the configuration capacities of the generator sets, the electrochemical energy storage devices and the electric load balancing devices.