Full life cycle configuration method and system for adjusting resources in isolated network system

Abstract

The invention provides a full life cycle configuration method and system for adjusting resources in an isolated network system. The method comprises the following steps: constructing a configuration scheme cost function based on unit investment cost and configuration capacity of a generator set, an electrochemical energy storage device and an electric load balancing device; constructing an adjustment cost function based on a first corresponding relation between the first adjustment amount of the generator set and the adjustment cost of the generator set, a second corresponding relation between the second adjustment amount of the electrochemical energy storage device and the adjustment cost of the electrochemical energy storage device, and a third corresponding relation between the third adjustment amount of the adjustable load and the adjustment cost of the load; and taking the sum of the configuration scheme cost function and the adjustment cost function as a target function, and solving the target function by taking the minimum target function as the purpose to obtain the optimal configuration of the adjustment resources and the cooperative adjustment scheme. According to the method, the cost of resource adjustment in the whole life cycle from construction to operation is comprehensively considered, and the economical efficiency of the isolated network system is improved.

Description

Technical Field

[0001] This invention relates to the field of isolated network system control technology, specifically to a method and system for configuring the entire lifecycle of adjustment resources in an isolated network system. Background Technology

[0002] Islanded grids, as microgrids disconnected from the main power grid, are characterized by their small overall system capacity (with individual unit capacity not exceeding 8% of the total grid capacity), limited rotational inertia and thermal potential energy reserves, resulting in weak system resilience to disturbances. Load changes directly affect voltage and frequency stability, making them susceptible to frequency or voltage collapse due to active power imbalances, and causing lengthy recovery times. To address these issues, current technologies typically employ electrochemical energy storage, load balancing devices, or both, as auxiliary operating mechanisms for islanded grid systems. When fluctuations occur, the regulating capabilities of the regulating resources comprised of generator sets, electrochemical energy storage, and load balancing devices maintain the stability of the islanded grid system and prevent system collapse.

[0003] Existing regulation resources are configured only based on static configuration during construction, and are selected according to the maximum power and energy consumption under extreme operating conditions. While this configuration method can meet the requirements for system stability regulation, it suffers from overcapacity. Furthermore, it only considers the cost of regulation resources during the static configuration phase, neglecting the regulation costs throughout the entire lifecycle, including the dynamic regulation phase, thus leading to a high overall lifecycle cost for regulation resources.

[0004] Therefore, there is an urgent need to provide a method and system for configuring resources throughout the entire lifecycle of isolated network systems, taking into account the costs of the entire lifecycle from construction to operation, and determining optimized configuration and coordinated adjustment schemes to improve the economic efficiency of isolated network systems throughout their entire lifecycle. Summary of the Invention

[0005] In view of this, it is necessary to provide a method and system for configuring the entire lifecycle of adjustment resources in an isolated network system, in order to solve the technical problem that the existing technology does not consider the adjustment cost of the entire lifecycle, including the dynamic adjustment stage, which leads to poor economic efficiency of the isolated network system.

[0006] In a first aspect, the present invention provides a method for configuring regulation resources throughout their entire lifecycle in an isolated grid system. The regulation resources include generator sets, electrochemical energy storage devices, and electrical load balancing devices. The method includes: The unit power investment cost of the generator set, the unit capacity investment cost of the electrochemical energy storage device, and the unit power investment cost of the load balancing device are obtained. A configuration scheme cost function is constructed with the first configuration capacity of the generator set, the second configuration capacity of the electrochemical energy storage device, and the third configuration capacity of the load balancing device as unknowns. A first correspondence between the first regulation amount of the generator set and the regulation cost of the generator set is established, and a second correspondence between the second regulation amount of the electrochemical energy storage device and the regulation cost of the electrochemical energy storage device is established. Based on the adjustable characteristics of the power load in the isolated grid system, the adjustable load in the power load is determined, and a third correspondence between the third regulation amount of the adjustable load and the load regulation cost is established. Based on the first correspondence, the second correspondence, and the third correspondence, an adjustment cost function is constructed within a preset adjustment time, with the first adjustment amount, the second adjustment amount, and the third adjustment amount as unknowns. The sum of the configuration cost function and the adjustment cost function is used as the objective function, and the objective function is solved with the goal of minimizing it, to obtain the optimized configuration of the adjustment resources and the coordinated adjustment scheme.

[0007] In some possible implementations, the objective function is: LCC=CT total +AT total CT total =CT G ×(P G.Total.max -P G.con )+CT S ×C S +CT R ×P R AT total =AT G.N +AT s +AT La In the formula, LCC To adjust the total life cycle cost of resources; CT total For configuration solution cost; AT total To adjust costs; CT G The unit power investment cost of the generator set; CT S This refers to the unit capacity investment cost of electrochemical energy storage devices. CT R The unit power investment cost of the electrical load balancing device; PG.Total.max The first configured capacity; P G.con This refers to the continuous operating power of an isolated network system during normal operation. C S For the second configuration capacity; P R For the third configuration capacity; AT G.N For generator set regulation costs; AT s Adjusting costs for electrochemical energy storage devices; AT La The cost of adjusting the electrical load balancing device.

[0008] In some possible implementations, the first correspondence is:

[0009] The second correspondence is:

[0010] The third correspondence is as follows:

[0011] In the formula, This represents the total number of generator sets. The unit regulation cost of the generator set; This is the first adjustment value for the Nth generator; For the Nth generator unit at time T The power at any time t between time points; Let be the power of the Nth generator unit at time T; be the preset adjustment time. This is the second adjustment amount; For correction factors of electrochemical energy storage devices; This refers to the total capacity of the electrochemical energy storage device. To complete the full charge-discharge cycle count; This refers to the total investment cost of the electrochemical energy storage device; To comprehensively adjust the cost coefficient; This is the third adjustment amount; The load power at time t for the adjustable load; This represents the load power at time T for the adjustable load.

[0012] In some possible implementations, the electrical load includes primary loads, secondary loads, and tertiary loads. The primary load includes primary stable loads and primary impulsive loads. The secondary load includes secondary stable loads and secondary impulsive loads. The tertiary load includes tertiary stable loads and tertiary impulsive loads. The primary stable load includes primary stable adjustable loads and primary stable non-adjustable loads. The primary impulsive load includes primary impulsive adjustable loads and primary impulsive non-adjustable loads. The secondary stable load includes secondary stable adjustable loads and secondary stable non-adjustable loads. The secondary impulsive load includes secondary impulsive adjustable loads and secondary impulsive non-adjustable loads. The tertiary stable load includes tertiary stable adjustable loads and tertiary stable non-adjustable loads. The tertiary impulsive load includes tertiary impulsive adjustable loads and tertiary impulsive non-adjustable loads.

[0013] In some possible implementations, the objective function is solved with the goal of minimizing it to obtain the optimal allocation of the adjustment resources and the coordinated adjustment scheme, including: Based on the load power of various types of electrical loads, the configuration scheme cost function is constructed to satisfy the static constraint condition of power balance under different operating conditions, and the adjustment cost function is constructed to satisfy the dynamic constraint condition of adjustment demand during the adjustment process. Based on the static and dynamic constraints, the objective function is solved with the goal of minimizing the objective function, thereby obtaining the optimal allocation of the adjustment resources and the coordinated adjustment scheme.

[0014] In some possible implementations, the static constraints include generator set constraints and electrochemical energy storage device constraints. The generator set constraints include generator set capacity constraints and generator set speed regulation performance constraints. The electrochemical energy storage device constraints include instantaneous power constraints, capacity constraints of the electrochemical energy storage device during normal operation, and capacity constraints of the electrochemical energy storage device when a single generator with the maximum power output fails and exits the system. The capacity constraint of the generator set is: P G.Total.max ≥A×(P Ls +P Li.max -P S ) The speed regulation performance constraint of the generator set is: V G ≤B×P G.Toatal.max The instantaneous power constraint of the electrochemical energy storage device is: P S ≥P G.single.max -P L3 -PL2.a The capacity constraint of electrochemical energy storage devices during normal operation is:

[0015] 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:

[0016] In the formula, P G.Total.max P represents the maximum total power of the generator set; A is the reserve capacity factor; P Ls For stable load power; P Li.max P represents the maximum power of the impact load. S V is the instantaneous power of the electrochemical energy storage device. G B is the actual regulating rate of the generator set; P is the comprehensive speed regulation coefficient of the generator set; 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 m-1 To T m 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; This refers to the continuous operating power of the generator set during normal system operation. 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.

[0017] In some possible implementations, the static constraints also include load increase rate constraints and load decrease rate constraints; The load increase rate constraint is: V Gr.max +V S.max ≥V Lir.max +V Lsr.max The load reduction rate constraint is: P R.max +P S.max ≥PLd.max In the formula, V Gr.max V represents the maximum load increase rate of the generator set. S.max V represents the maximum power change rate of the electrochemical energy storage device. Lir.max V represents the maximum rate of increase of the impact load; Lsr.max The maximum value of the rate of increase of stable load; P R.max P represents the instantaneous maximum power of the electrical load balancing device. S.max P represents the maximum instantaneous power of the electrochemical energy storage device. Ld.max This represents the maximum power output during a sudden drop in total load.

[0018] In some possible implementations, the static constraints also include constraints on the charge / discharge ratio of the energy storage battery in the electrochemical energy storage device, wherein the charge / discharge ratio constraints are:

[0019] In the formula, The required capacity for electrochemical energy storage devices; This represents the capacity margin factor for electrochemical energy storage devices. This refers to the charge / discharge rate of the electrochemical energy storage device.

[0020] In some possible implementations, the dynamic constraint is:

[0021] In the formula, This refers to the total power that needs to be regulated in an isolated power grid. For generator sets in The amount of power regulated over a period of time; For electrochemical energy storage devices in The amount of power regulated over a period of time; For adjustable load The amount of power regulated over a period of time; Frequency deviation in an isolated power grid; This refers to the power imbalance in an isolated power grid. This is a dead zone for frequency adjustment. This is the power regulation dead zone.

[0022] Secondly, the present invention also provides a full lifecycle configuration system for regulating resources in an isolated grid system, wherein the regulating resources include generator sets, electrochemical energy storage devices, and electrical load balancing devices, and the system includes: The configuration scheme cost function determination unit is used to obtain the unit power investment cost of the generator set, the unit capacity investment cost of the electrochemical energy storage device, and the unit power investment cost of the electrical load balancing device, and to construct the configuration scheme cost function with the first configuration capacity of the generator set, the second configuration capacity of the electrochemical energy storage device, and the third configuration capacity of the electrical load balancing device as unknowns; The regulation quantity and regulation cost relationship construction unit is used to construct a first correspondence between the first regulation quantity of the generator set and the regulation cost of the generator set, a second correspondence between the second regulation quantity of the electrochemical energy storage device and the regulation cost of the electrochemical energy storage device, and to determine the adjustable load in the power load based on the adjustable characteristics of the power load in the isolated grid system, and to construct a third correspondence between the third regulation quantity of the adjustable load and the load regulation cost. The adjustment cost function construction unit is used to construct an adjustment cost function within a preset adjustment time, based on the first correspondence, the second correspondence, and the third correspondence, with the first adjustment amount, the second adjustment amount, and the third adjustment amount as unknowns. The full lifecycle configuration unit is used to take the sum of the configuration scheme cost function and the adjustment cost function as the objective function, and solve the objective function with the goal of minimizing the objective function, so as to obtain the optimized configuration of the adjustment resources and the coordinated adjustment scheme.

[0023] The beneficial effects of adopting the above implementation method are as follows: The method for configuring regulation resources throughout the entire lifecycle in an isolated network system provided by this invention constructs a configuration cost function for the construction phase and a regulation cost function for the operation phase of regulation resources. Then, an objective function is constructed based on the configuration cost function and the regulation cost function, and the objective function is solved to obtain the optimal configuration and coordinated regulation scheme of regulation resources. This realizes the transformation from configuration method to coordinated control, that is, comprehensively considering the cost of regulation resources throughout the entire lifecycle from construction to operation, determining the optimal configuration scheme and coordinated regulation scheme with the minimum comprehensive cost, achieving the lowest cost throughout the entire lifecycle, and thus greatly improving the economy of the isolated network system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic flowchart of an embodiment of the method for adjusting the full lifecycle configuration of resources in an isolated network system provided by the present invention; Figure 2A schematic diagram of an embodiment of the multi-level classification load provided by the present invention; Figure 3 For the present invention Figure 1 A schematic flowchart of an embodiment of obtaining the optimized allocation of adjustment resources and the coordinated adjustment scheme in step S104; Figure 4 A schematic diagram of an embodiment of the amount of electricity that the electrochemical energy storage device needs to provide or absorb during a complete production cycle provided by the present invention; Figure 5 This is a schematic diagram of an embodiment of the resource lifecycle configuration system for adjusting resources in an isolated network system provided by the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] It should be understood that the illustrative drawings are not drawn to scale. The flowcharts used in this invention illustrate operations implemented according to some embodiments of the invention. It should be understood that the operations in the flowcharts may be implemented out of order, and steps without logical contextual relationships may be reversed or performed simultaneously. Furthermore, those skilled in the art, guided by the content of this invention, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0028] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] This invention provides a method and system for configuring resources throughout their entire lifecycle in an isolated network system, which will be described below.

[0031] Before demonstrating specific embodiments, it should be noted that the embodiments of the present invention achieve stable and reliable operation of the islanded grid system by configuring regulating resources. These regulating resources include generator sets, electrochemical energy storage devices, and load balancing devices. Generator sets provide the basic power for the islanded grid system, covering conventional load demands, and serve as backup support for the electrochemical energy storage devices and load balancing devices. The electrochemical energy storage devices provide instantaneous power response and provide transitional support in the event of a single generator failure. The load balancing devices are instantaneously activated as resistive loads, consuming excess power generation and replacing the actual load when there is excess power generation, ensuring production continuity. This allows for zero-cost regulation.

[0032] Figure 1 This is a flowchart illustrating an embodiment of the method for adjusting the full lifecycle configuration of resources in an isolated network system proposed in this invention. Figure 1 As shown, the method for adjusting the full lifecycle configuration of resources in an isolated network system includes: S101. Obtain the unit power investment cost of the generator set, the unit capacity investment cost of the electrochemical energy storage device, and the unit power investment cost of the load balancing device, and construct the configuration scheme cost function with the first configuration capacity of the generator set, the second configuration capacity of the electrochemical energy storage device, and the third configuration capacity of the load balancing device as unknowns. S102. Construct a first correspondence between the first regulation amount of the generator set and the regulation cost of the generator set, and a second correspondence between the second regulation amount of the electrochemical energy storage device and the regulation cost of the electrochemical energy storage device. Based on the adjustable characteristics of the power load in the isolated grid system, determine the adjustable load in the power load, and construct a third correspondence between the third regulation amount of the adjustable load and the load regulation cost.

[0033] Since the impact of electrical loads on production and their adjustability vary, when a generator fails, the continuity of production can be ensured by disconnecting loads with lower impact on production. Furthermore, the stable operation of the islanded grid system can be achieved by adjusting adjustable loads. Therefore, classifying the characteristics of electrical loads and determining adjustable loads is particularly important.

[0034] Specifically, based on the load's requirements for power supply reliability, the power load is divided into a first level to obtain multiple first-level loads; based on the load fluctuation characteristics, each first-level load is divided into a second level to obtain multiple second-level loads; based on the load's adjustability characteristics, each second-level load is divided into a third level to obtain multiple third-level loads.

[0035] In specific embodiments of the present invention, such as Figure 2 As shown, the first-level load includes primary load L1, secondary load L2, and tertiary load L3. The calculated power P for each of these three load types is obtained by summing and calculating their respective values. L1 P L2 P L3 Level 1 loads are those where short-term power outages may affect the normal service life of equipment, causing production to stop or power generation to drop significantly; Level 2 loads are those where short-term power outages are permissible, but prolonged outages may affect the normal service life of equipment or disrupt normal production; Level 3 loads are those where prolonged power outages will not directly affect production.

[0036] The second-level load includes first-level stable loads and first-level impulsive loads corresponding to first-level loads, second-level stable loads and second-level impulsive loads corresponding to second-level loads, and third-level stable loads and third-level impulsive loads corresponding to third-level loads. Among them, stable loads are loads whose load power change per unit time under normal operating conditions is less than or equal to the preset power; impulsive loads are loads whose load power change per unit time under normal operating conditions is greater than the preset power.

[0037] The preset power is determined by the rated power, specifically as a preset percentage of the rated power. The percentage is negatively correlated with the proportion of the maximum value of the impulsive load power in the islanded network system to the total load power. Simultaneously, the value of X can be used to measure the type of islanded network system. A larger X value indicates that the islanded network system has more stable loads, classifying it as a load-stable islanded network system; a smaller X value indicates that the islanded network system has more impulsive loads, classifying it as a load-impulsive islanded network system.

[0038] The third-level load includes the first-level stable adjustable load and the first-level stable non-adjustable load corresponding to the first-level stable load; the first-level impactful adjustable load and the first-level impactful non-adjustable load corresponding to the first-level impactful load; the second-level stable adjustable load and the second-level stable non-adjustable load corresponding to the second-level stable load; the second-level impactful adjustable load and the second-level impactful non-adjustable load corresponding to the second-level impactful load; the third-level stable adjustable load and the third-level stable non-adjustable load corresponding to the third-level stable load; and the third-level impactful adjustable load and the third-level impactful non-adjustable load corresponding to the third-level impactful load. Specifically, adjustable loads are loads that can be operated through time-series adjustments, or loads whose adjustments will not affect the main production or have a minor impact; non-adjustable loads are loads whose adjustments will have a significant impact on the main production system.

[0039] In practical applications, there may be scenarios where different levels of electrical loads need to be operated separately. To avoid conflicts, in a specific embodiment of the present invention, 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.

[0040] In other words, when operating on higher-level loads, the low-privilege attribute restrictions of lower-level loads will be ignored.

[0041] After three levels of load classification, the embodiments of the present invention divide all electrical loads into 12 types. Each type of load contains three attributes, which are used to accurately monitor and control each type of load during the islanded grid stability adjustment process.

[0042] S103. Based on the first correspondence, the second correspondence, and the third correspondence, construct an adjustment cost function with the first adjustment amount, the second adjustment amount, and the third adjustment amount as unknowns within a preset adjustment time. S104. Take the sum of the configuration scheme cost function and the adjustment cost function as the objective function, and solve the objective function with the goal of minimizing the objective function to obtain the optimal configuration of adjustment resources and the coordinated adjustment scheme.

[0043] The objective function can be solved using any of the existing methods, and no specific restrictions are imposed here.

[0044] For example, the coordinated regulation scheme in this embodiment of the invention is as follows: When there is excess power, the priority of introducing an electrical load balancing device, charging an electrochemical energy storage device, and reducing the power of the generator set decreases sequentially. That is, zero marginal cost is achieved first by introducing an electrical load balancing device, thereby reducing regulation costs. When there is a power shortage, the priority of increasing production through adjustable load, discharging the electrochemical energy storage device, and increasing power of the generator set decreases sequentially. That is, negative cost regulation is achieved first by adjusting the load, such as offsetting system costs and increasing revenue by increasing production.

[0045] It should be understood that the method for configuring the entire lifecycle of adjustment resources in an isolated network system according to the embodiments of the present invention can be implemented in any device based on the method for configuring the entire lifecycle of adjustment resources in an isolated network system, such as electronic devices on the control side of the isolated network system. Specifically, the method for configuring the entire lifecycle of adjustment resources in an isolated network system is stored in the aforementioned device as a pre-programmed program. When the device starts, the program is invoked, and the method for configuring the entire lifecycle of adjustment resources in an isolated network system is implemented.

[0046] Compared with existing technologies, the method for configuring regulation resources throughout the entire lifecycle in an isolated network system provided by this invention constructs a configuration cost function for the construction phase and a regulation cost function for the operation phase. Then, an objective function is constructed based on the configuration cost function and the regulation cost function, and the objective function is solved to obtain the optimal configuration and coordinated regulation scheme for the regulation resources. This achieves a comprehensive consideration of the cost of the regulation resources throughout their entire lifecycle, from construction to operation, from configuration method to coordinated control. The optimal configuration scheme and coordinated regulation scheme are determined with the minimum comprehensive cost, thus achieving the lowest cost throughout the entire lifecycle and greatly improving the economic efficiency of the isolated network system.

[0047] In some embodiments of the present invention, the objective function is: LCC=CT total +AT total CT total =CT G ×(P G.Total.max -P G.con )+CT S ×C S +CT R ×P R AT total =ATG.N +AT s +AT La In the formula, LCC To adjust the total life cycle cost of resources; CT total For configuration solution cost; AT total To adjust costs; CT G The unit power investment cost of the generator set; CT S This refers to the unit capacity investment cost of electrochemical energy storage devices. CT R The unit power investment cost of the electrical load balancing device; P G.Total.max The first configured capacity; P G.con This refers to the continuous operating power of an isolated network system during normal operation. C S For the second configuration capacity; P R For the third configuration capacity; AT G.N For generator set regulation costs; AT s Adjusting costs for electrochemical energy storage devices; AT La The cost of adjusting the electrical load balancing device.

[0048] In a specific embodiment of the present invention, the first correspondence is as follows:

[0049] The first correspondence is derived from the analysis of the generator set operating efficiency under different operating power and the reduction in mechanical life caused by load increase or decrease.

[0050] Specifically, the generator set Rong Rongliang is divided into N generator sets, which can be divided equally or unequally.

[0051] The second correspondence is:

[0052] The third correspondence is:

[0053] In the formula, This represents the total number of generator sets. The unit regulation cost of the generator set; This is the first adjustment value for the Nth generator; For the Nth generator unit at time T The power at any time t between time points; Let be the power of the Nth generator unit at time T; be the preset adjustment time. This is the second adjustment amount; For correction factors of electrochemical energy storage devices; This refers to the total capacity of the electrochemical energy storage device. To complete the full charge-discharge cycle count; This refers to the total investment cost of the electrochemical energy storage device; To comprehensively adjust the cost coefficient; This is the third adjustment amount; The load power at time t for the adjustable load; This represents the load power at time T for the adjustable load.

[0054] To improve the fit between the solution of the objective function and the actual situation, in some embodiments of the present invention, such as... Figure 3 As shown, step S104 involves solving the objective function with the goal of minimizing it, to obtain the optimal allocation of adjustment resources and the coordinated adjustment scheme, including: S301. Based on the load power of various types of electrical loads, the configuration scheme cost function is constructed to meet the static constraint condition of power balance under different operating conditions, and the adjustment cost function is to meet the dynamic constraint condition of adjustment demand during the adjustment process. S302. Based on static and dynamic constraints, the objective function is solved with the goal of minimizing the objective function, thereby obtaining the optimal allocation of regulatory resources and the coordinated regulation scheme.

[0055] The embodiments of the present invention use the constructed static and dynamic constraints as boundary conditions in the process of solving the objective function, which can improve the adaptability of the solved optimal configuration and coordinated adjustment scheme to the actual working conditions, that is, improve the accuracy and reliability of the determined optimal configuration and coordinated adjustment scheme.

[0056] In some embodiments of the present invention, static constraints include generator set constraints and electrochemical energy storage device constraints. Generator set constraints include generator set capacity constraints and generator set speed regulation performance constraints. Electrochemical energy storage device constraints include instantaneous power constraints, capacity constraints of electrochemical energy storage devices during normal operation, and capacity constraints of electrochemical energy storage devices when a single generator with the maximum power output fails and exits the system. The capacity constraint of the generator set is: P G.Total.max ≥A×(P Ls +P Li.max -P S ) The speed regulation performance constraints of the generator set are: V G ≤B×P G.Toatal.max 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 electrochemical energy storage devices during normal operation is:

[0057] 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:

[0058] In the formula, P G.Total.max P represents the maximum total power of the generator set; A is the reserve capacity factor; P Ls For stable load power; P Li.max P represents the maximum power of the impact load. S V is the instantaneous power of the electrochemical energy storage device. G B is the actual regulating rate of the generator set; P is the comprehensive speed regulation coefficient of the generator set; 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 m-1 To T m 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; This refers to the continuous operating power of the generator set during normal system operation. 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.

[0059] The capacity constraints for generator sets are as follows: the maximum configured capacity of the generator set should be greater than or equal to the maximum fluctuation of the impact load minus the capacity of the electrochemical energy storage device. The speed regulation performance constraint for generator sets is that the overall speed regulation performance presented by the generator should be less than or equal to the speed regulation capability corresponding to the maximum configured capacity of the generator set. The instantaneous power constraint for the electrochemical energy storage device should be greater than or equal to the power deficit after the isolated grid system disconnects tertiary loads and some adjustable secondary loads when a single generator with maximum generating power fails and exits. The capacity constraint for the electrochemical energy storage device during normal operation is that the maximum amount of electricity provided by the electrochemical energy storage device should meet the difference between the electricity required by the isolated grid system load and the electricity generated by the generator set within a typical complete production cycle.

[0060] Where m is an integer greater than or equal to 1. Representation function At the nth moment, This indicates that electrochemical energy storage devices need to supply electrical energy to isolated power grids. This indicates that the electrochemical energy storage device needs to absorb electrical energy from an isolated power grid. In a specific embodiment of the present invention, T m-1 To T m The amount of electricity that the electrochemical energy storage device needs to provide or absorb within a given time period, such as Figure 4 As shown, where, Figure 4 The electricity above the vertical axis represents the electricity that needs to be supplied, while the electricity below the vertical axis represents the electricity that needs to be absorbed.

[0061] Furthermore, in addition to capacity constraints, to meet the requirements of dynamic power balance in islanded grid systems, the power of islanded grid systems must have a response capability no less than that of the load surge when all electrical loads surge. Therefore, in specific embodiments of the present invention, static constraints also include load increase rate constraints and load decrease rate constraints. The load increase rate constraint is: V Gr.max +V S.max ≥V Lir.max +V Lsr.max In the formula, V Gr.max V represents the maximum load increase rate of the generator set. S.max V represents the maximum power change rate of the electrochemical energy storage device. Lir.max V represents the maximum rate of increase of the impact load; Lsr.max This represents the maximum rate of increase in load for a stable load.

[0062] In real-world scenarios, the most extreme case of load reduction is when a fault in the isolated network system causes a massive instantaneous loss of load, yet balance is still achieved. This means that the static constraints also include a load reduction rate constraint, which is: V R.max +VS.max ≥V Ld.max In the formula, V R.max V represents the maximum rate of change of power in the electrical load balancing device. Ld.max This represents the maximum rate at which the total load decreases externally.

[0063] Under this operating condition, the electrical load balancing device and the electrochemical energy storage device are activated instantaneously, and the load deficit drops abruptly due to the fault. Therefore, integrating the above equation yields:

[0064] After reorganization, the specific load reduction rate constraint is as follows: P R.max +P S.max ≥P Ld.max In the formula, P R.max P represents the instantaneous maximum power of the electrical load balancing device. S.max P represents the maximum instantaneous power of the electrochemical energy storage device. Ld.max This represents the maximum power output during a sudden drop in total load.

[0065] In addition to the static constraints described above, in specific embodiments of the present invention, the static constraints also include the charge / discharge ratio constraints of the energy storage battery in the electrochemical energy storage device, wherein the charge / discharge ratio constraints are as follows:

[0066] In the formula, The required capacity for electrochemical energy storage devices; This represents the capacity margin factor for electrochemical energy storage devices. This refers to the charge / discharge rate of the electrochemical energy storage device.

[0067] In some embodiments of the present invention, the dynamic constraint conditions are as follows:

[0068] In the formula, This refers to the total power that needs to be regulated in an isolated power grid. For generator sets in The amount of power regulated over a period of time; For electrochemical energy storage devices in The amount of power regulated over a period of time; For adjustable load The amount of power regulated over a period of time; Frequency deviation in an isolated power grid; This refers to the power imbalance in an isolated power grid. This is a dead zone for frequency adjustment. This is the power regulation dead zone.

[0069] In this context, the total power requiring regulation in an isolated power grid is determined jointly by the first total power requiring regulation calculated from the frequency deviation and the second total power requiring regulation calculated from the power imbalance. Specifically:

[0070] In the formula, This represents the first total power. This is the second total power.

[0071] It should be noted that when the frequency deviation is less than or equal to the frequency adjustment dead zone, or the power imbalance is less than or equal to the power adjustment dead zone, the islanded system will not output a power adjustment command.

[0072] The frequency adjustment dead zone and power adjustment dead zone are used to filter out minute fluctuations, such as sensor noise or short-term disturbances, to prevent malfunctions from interfering with the system and to improve the reliability of the adjustment.

[0073] It should be noted that the frequency adjustment dead zone and power adjustment dead zone in the embodiments of the present invention can be dynamically set according to the proportion of adjustable load, so as to maximize the utilization of flexible load resources, reduce ineffective actions, avoid system losses, and improve system life.

[0074] In addition to the dynamic constraints described above, in some embodiments of the present invention, the dynamic constraints also include power constraints and regulation rate constraints of generator sets, power constraints and regulation rate constraints of adjustable loads, and power constraints and capacity constraints of electrochemical energy storage devices. Specifically: P G.N.min ≤P G.N(t) ≤P G.N.max V G.N.min ≤V G.N(t) ≤V G.N.max P La.min ≤P La(t) ≤P La.max V La.min ≤V La(t) ≤V La.max -P S.max ≤P S ≤P S.max W S.min ≤W S ≤W S.max In the formula, P G.N.min P G.N.max V G.N.min V G.N.maxThese represent the minimum power, maximum power, minimum regulation rate, and maximum regulation rate of the generator set, respectively; P La.min P La.max V La.min V La.max These represent the minimum power, maximum power, minimum adjustment rate, and maximum adjustment rate of the adjustable load, respectively; -P S.max P S.max W S.min W S.max These are the maximum discharge efficiency, maximum charging efficiency, minimum capacity, and maximum capacity of the electrochemical energy storage device.

[0075] In summary, the resource allocation method for the entire lifecycle in isolated network systems proposed in this invention addresses the problems caused by unreasonable capacity allocation and control methods. This invention integrates system investment cost (configuration scheme cost function) and system adjustment cost (adjustment cost function) into a single objective function for the entire lifecycle. By minimizing the objective function under static and dynamic constraints, the optimal configuration and collaborative adjustment scheme with the lowest overall lifecycle cost can be obtained. This achieves comprehensive consideration of costs throughout the entire lifecycle, from configuration methods to collaborative control, from construction to operation, thereby significantly improving the economic efficiency of isolated network systems.

[0076] To better implement the method for configuring the entire lifecycle of regulating resources in an isolated grid system according to the embodiments of the present invention, the embodiments of the present invention also provide a system for configuring the entire lifecycle of regulating resources in an isolated grid system, based on the method for configuring the entire lifecycle of regulating resources in an isolated grid system. The regulating resources include generator sets, electrochemical energy storage devices, and electrical load balancing devices, such as... Figure 5 As shown, the resource lifecycle configuration system 500 in an isolated network system includes: The configuration scheme cost function determination unit 501 is used to obtain the unit power investment cost of the generator set, the unit capacity investment cost of the electrochemical energy storage device, and the unit power investment cost of the electric load balancing device, and to construct the configuration scheme cost function with the first configuration capacity of the generator set, the second configuration capacity of the electrochemical energy storage device, and the third configuration capacity of the electric load balancing device as unknowns. The regulation quantity and regulation cost relationship construction unit 502 is used to construct a first correspondence between the first regulation quantity of the generator set and the regulation cost of the generator set, a second correspondence between the second regulation quantity of the electrochemical energy storage device and the regulation cost of the electrochemical energy storage device, and to determine the adjustable load in the power load based on the adjustable characteristics of the power load in the islanded grid system, and to construct a third correspondence between the third regulation quantity of the adjustable load and the load regulation cost. The adjustment cost function construction unit 503 is used to construct an adjustment cost function within a preset adjustment time, based on the first correspondence, the second correspondence, and the third correspondence, with the first adjustment amount, the second adjustment amount, and the third adjustment amount as unknowns. The full lifecycle configuration unit 504 is used to take the sum of the configuration scheme cost function and the adjustment cost function as the objective function, and solve the objective function with the goal of minimizing the objective function, so as to obtain the optimized configuration of adjustment resources and the coordinated adjustment scheme.

[0077] The resource lifecycle configuration system 500 in the isolated network system provided in the above embodiments can realize the technical solutions described in the embodiments of the resource lifecycle configuration method in the isolated network system. The specific implementation principles of each module or unit can be found in the corresponding content in the embodiments of the resource lifecycle configuration method in the isolated network system, and will not be repeated here.

[0078] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware (such as a processor, controller, etc.), and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0079] The above provides a detailed description of the method and system for configuring resources throughout their entire lifecycle in an isolated network system. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for configuring resources throughout their entire lifecycle in an isolated network system, characterized in that, The regulating resources include generator sets, electrochemical energy storage devices, and electrical load balancing devices, and the method includes: The unit power investment cost of the generator set, the unit capacity investment cost of the electrochemical energy storage device, and the unit power investment cost of the load balancing device are obtained. A configuration scheme cost function is constructed with the first configuration capacity of the generator set, the second configuration capacity of the electrochemical energy storage device, and the third configuration capacity of the load balancing device as unknowns. A first correspondence between the first regulation amount of the generator set and the regulation cost of the generator set is established, and a second correspondence between the second regulation amount of the electrochemical energy storage device and the regulation cost of the electrochemical energy storage device is established. Based on the adjustable characteristics of the power load in the isolated grid system, the adjustable load in the power load is determined, and a third correspondence between the third regulation amount of the adjustable load and the load regulation cost is established. Based on the first correspondence, the second correspondence, and the third correspondence, an adjustment cost function is constructed within a preset adjustment time, with the first adjustment amount, the second adjustment amount, and the third adjustment amount as unknowns. The sum of the configuration cost function and the adjustment cost function is used as the objective function, and the objective function is solved with the goal of minimizing it, to obtain the optimized configuration of the adjustment resources and the coordinated adjustment scheme.

2. The method for configuring resources throughout their entire lifecycle in an isolated network system according to claim 1, characterized in that, The objective function is: LCC=CT total +AT total CT total =CT G ×(P G.Total.max -P G.con )+CT S ×C S +CT R ×P R AT total =AT G.N +AT s +AT La In the formula, LCC To adjust the total life cycle cost of resources; CT total For configuration solution cost; AT total To adjust costs; CT G The unit power investment cost of the generator set; CT S This refers to the unit capacity investment cost of electrochemical energy storage devices. CT R The unit power investment cost of the electrical load balancing device; P G.Total.max The first configured capacity; P G.con This refers to the continuous operating power of an isolated network system during normal operation. C S For the second configuration capacity; P R For the third configuration capacity; AT G.N For generator set regulation costs; AT s Adjusting costs for electrochemical energy storage devices; AT La The cost of adjusting the electrical load balancing device.

3. The method for configuring resources throughout their entire lifecycle in an isolated network system according to claim 2, characterized in that, The first correspondence is: The second correspondence is: The third correspondence is as follows: In the formula, This represents the total number of generator sets. The unit regulation cost of the generator set; This is the first adjustment value for the Nth generator; For the Nth generator unit at time T The power at any time t between time points; Let be the power of the Nth generator unit at time T; be the preset adjustment time. This is the second adjustment amount; For correction factors of electrochemical energy storage devices; This refers to the total capacity of the electrochemical energy storage device. To complete the full charge-discharge cycle count; This refers to the total investment cost of the electrochemical energy storage device; To comprehensively adjust the cost coefficient; This is the third adjustment amount; The load power at time t for the adjustable load; This represents the load power at time T for the adjustable load.

4. The method for configuring the entire lifecycle of resources in an isolated network system according to claim 3, characterized in that, The electrical loads include primary loads, secondary loads, and tertiary loads. Primary loads include primary stable loads and primary impulsive loads. Secondary loads include secondary stable loads and secondary impulsive loads. Tertiary loads include tertiary stable loads and tertiary impulsive loads. Primary stable loads include primary stable adjustable loads and primary stable non-adjustable loads. Primary impulsive loads include primary impulsive adjustable loads and primary impulsive non-adjustable loads. Secondary stable loads include secondary stable adjustable loads and secondary stable non-adjustable loads. Secondary impulsive loads include secondary impulsive adjustable loads and secondary impulsive non-adjustable loads. Tertiary stable loads include tertiary stable adjustable loads and tertiary stable non-adjustable loads. Tertiary impulsive loads include tertiary impulsive adjustable loads and tertiary impulsive non-adjustable loads.

5. The method for configuring the entire lifecycle of resources in an isolated network system according to claim 4, characterized in that, Solving the objective function with the goal of minimizing it yields an optimized allocation of the adjustment resources and a coordinated adjustment scheme, including: Based on the load power of various types of electrical loads, the configuration scheme cost function is constructed to satisfy the static constraint condition of power balance under different operating conditions, and the adjustment cost function is constructed to satisfy the dynamic constraint condition of adjustment demand during the adjustment process. Based on the static and dynamic constraints, the objective function is solved with the goal of minimizing the objective function, thereby obtaining the optimal allocation of the adjustment resources and the coordinated adjustment scheme.

6. The method for configuring the entire lifecycle of resources in an isolated network system according to claim 5, characterized in that, The static constraints include generator set constraints and electrochemical energy storage device constraints. The generator set constraints include generator set capacity constraints and generator set speed regulation performance constraints. The electrochemical energy storage device constraints include instantaneous power constraints, capacity constraints of the electrochemical energy storage device during normal operation, and capacity constraints of the electrochemical energy storage device when a single generator with the maximum power output fails and exits the system. The capacity constraint of the generator set is: P G.Total.max ≥A×(P Ls +P Li.max -P S ) The speed regulation performance constraint of the generator set is: In G ≤B×P G.Toatal.max 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 electrochemical energy storage devices during normal operation is: 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: In the formula, P G.Total.max P represents the maximum total power of the generator set; A is the reserve capacity factor; P Ls For stable load power; P Li.max P represents the maximum power of the impact load. S V is the instantaneous power of the electrochemical energy storage device. G B is the actual regulating rate of the generator set; P is the comprehensive speed regulation coefficient of the generator set; 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 m-1 To T m 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; This refers to the continuous operating power of the generator set during normal system operation. 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.

7. The method for configuring the entire lifecycle of resources in an isolated network system according to claim 6, characterized in that, The static constraints also include load increase rate constraints and load decrease rate constraints; The load increase rate constraint is: V Gr.max +V S.max ≥V Lir.max +V Lsr.max The load reduction rate constraint is: P R.max +P S.max ≥P Ld.max In the formula, V Gr.max V represents the maximum load increase rate of the generator set. S.max V represents the maximum power change rate of the electrochemical energy storage device. Lir.max V represents the maximum rate of increase of the impact load; Lsr.max The maximum value of the rate of increase of stable load; P R.max P represents the instantaneous maximum power of the electrical load balancing device. S.max P represents the maximum instantaneous power of the electrochemical energy storage device. Ld.max This represents the maximum power output during a sudden drop in total load.

8. The method for configuring the entire lifecycle of resources in an isolated network system according to claim 7, characterized in that, The static constraints also include the charge / discharge ratio constraints of the energy storage battery in the electrochemical energy storage device, wherein the charge / discharge ratio constraints are as follows: In the formula, The required capacity for electrochemical energy storage devices; This represents the capacity margin factor for electrochemical energy storage devices. This refers to the charge / discharge rate of the electrochemical energy storage device.

9. The method for configuring the entire lifecycle of resources in an isolated network system according to claim 5, characterized in that, The dynamic constraint conditions are as follows: In the formula, This refers to the total power that needs to be regulated in an isolated power grid. For generator sets in The amount of power regulated over a period of time; For electrochemical energy storage devices in The amount of power regulated over a period of time; For adjustable load The amount of power regulated over a period of time; Frequency deviation in an isolated power grid; This refers to the power imbalance in an isolated power grid. This is a dead zone for frequency adjustment. This is the power regulation dead zone.

10. A resource lifecycle configuration system for adjusting resources in an isolated network system, characterized in that, The regulating resources include generator sets, electrochemical energy storage devices, and electrical load balancing devices; the system includes: The configuration scheme cost function determination unit is used to obtain the unit power investment cost of the generator set, the unit capacity investment cost of the electrochemical energy storage device, and the unit power investment cost of the electrical load balancing device, and to construct the configuration scheme cost function with the first configuration capacity of the generator set, the second configuration capacity of the electrochemical energy storage device, and the third configuration capacity of the electrical load balancing device as unknowns; The regulation quantity and regulation cost relationship construction unit is used to construct a first correspondence between the first regulation quantity of the generator set and the regulation cost of the generator set, a second correspondence between the second regulation quantity of the electrochemical energy storage device and the regulation cost of the electrochemical energy storage device, and to determine the adjustable load in the power load based on the adjustable characteristics of the power load in the isolated grid system, and to construct a third correspondence between the third regulation quantity of the adjustable load and the load regulation cost. The adjustment cost function construction unit is used to construct an adjustment cost function within a preset adjustment time, based on the first correspondence, the second correspondence, and the third correspondence, with the first adjustment amount, the second adjustment amount, and the third adjustment amount as unknowns. The full lifecycle configuration unit is used to take the sum of the configuration scheme cost function and the adjustment cost function as the objective function, and solve the objective function with the goal of minimizing the objective function, so as to obtain the optimized configuration of the adjustment resources and the coordinated adjustment scheme.

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