Method and device for determining power system configuration scheme and medium

Abstract

The embodiment of the invention provides a method and equipment for determining a power system configuration scheme and a medium. The method comprises the following steps: determining the initial inertia of a system; if the initial inertia of the system is smaller than the inertia demand value, the reactive response capability of each new energy node is calculated, and a first node is determined; if the first node is different from the previous configuration scheme, taking a new energy node of which the short-circuit ratio is smaller than a short-circuit ratio threshold value as a second node after simulating to carry out network construction type transformation on the first node; determining a current configuration scheme and a corresponding configuration cost; after the second node is simulated to be subjected to synchronous phase modifier configuration, the initial inertia of the system is determined again, and the step of judging whether the initial inertia of the system is larger than or equal to the inertia demand value or not is executed again; and if the first node is the same as the previous configuration scheme, selecting the scheme with the lowest configuration cost. According to the scheme, various configuration schemes of the new energy power system can be determined, the scheme with the lowest cost is selected as the target configuration scheme, and the economical efficiency of system transformation is guaranteed.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of new energy power system technology, and in particular to a method, device and medium for determining power system configuration scheme. Background Technology

[0002] The development of new energy power systems is a key measure to promote the low-carbon transformation of the power system. However, due to their remote geographical location and lack of local synchronization units, new energy power systems typically exhibit low inertia and low short-circuit ratios, leading to poor frequency stability and difficulty in recovering from voltage instability. Upgrading the grid structure of new energy nodes in new energy power systems can provide inertia support, enabling rapid recovery after voltage instability; configuring synchronous condensers at new energy nodes can provide short-circuit capacity, thereby increasing the short-circuit ratio of the new energy nodes, suppressing voltage fluctuations, and improving the overcurrent withstand capability of the nodes.

[0003] However, existing new energy power system configuration schemes have problems such as difficulty in meeting the dual requirements of inertia and voltage support, or configuration redundancy and poor economic efficiency. Summary of the Invention

[0004] This invention provides a method, device, and medium for determining power system configuration schemes, which can determine various configuration schemes for new energy power systems and select the scheme with the lowest cost as the target configuration scheme, thus ensuring the economic efficiency of system transformation.

[0005] In a first aspect, the method for determining a power system configuration scheme provided in the embodiments of the present invention includes: Determine the initial system inertia and check if it is greater than or equal to the inertia requirement. If the initial system inertia is less than the inertia requirement, calculate the reactive power response capability of each renewable energy node and determine the first node based on the reactive power response capability. If the first node is different from the first node in the previous configuration scheme, after simulating the network configuration modification of the first node, calculate the short-circuit ratio of each renewable energy node and designate the renewable energy node with a short-circuit ratio less than the short-circuit ratio threshold as the second node. Determine the current configuration scheme and its corresponding configuration cost, where the current configuration scheme is used to indicate the network configuration modification of the first node and the synchronous condenser configuration of the second node. After simulating the synchronous condenser configuration of the second node, redetermine the initial system inertia and return to the step of checking if the initial system inertia is greater than or equal to the inertia requirement until the first node is the same as the first node in the previous configuration scheme. If the first node is the same as the first node in the previous configuration scheme, select the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme.

[0006] Secondly, the power system configuration scheme determination device provided in the embodiments of the present invention includes: The system is divided into several modules: a determination module for determining the initial inertia of the system and whether it is greater than or equal to the required inertia value; a first determination module for calculating the reactive power response capability of each renewable energy node if the initial inertia is less than the required inertia value, and determining the first node based on the reactive power response capability; a second determination module for calculating the short-circuit ratio of each renewable energy node after simulating network modification of the first node if the first node is different from the first node in the previous configuration scheme, and designating renewable energy nodes with short-circuit ratios less than the short-circuit ratio threshold as the second node; and a cost determination module for determining the current configuration scheme. The configuration includes the following modules and their corresponding configuration costs: the current configuration scheme is used to indicate the network structure modification of the first node and the synchronous phase-shifting configuration of the second node; the third determination module is used to redetermine the initial inertia of the system after simulating the synchronous phase-shifting configuration of the second node, and return to the step of judging whether the initial inertia of the system is greater than or equal to the inertia requirement value, until the first node is the same as the first node in the previous configuration scheme; the selection module is used to select the scheme with the lowest configuration cost from all the currently determined configuration schemes as the target configuration scheme if the first node is the same as the first node in the previous configuration scheme.

[0007] Thirdly, the electronic device provided in the embodiments of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the method for determining a power system configuration scheme as in any embodiment of the present invention.

[0008] Fourthly, the computer-readable storage medium provided in the embodiments of the present invention stores computer instructions thereon, the computer instructions being used to cause a processor to execute a method for determining a power system configuration scheme as in any embodiment of the present invention.

[0009] Fifthly, the computer program product provided in the embodiments of the present invention includes a computer program that, when executed by a processor, implements the method for determining a power system configuration scheme as described in any embodiment of the present invention.

[0010] In this embodiment of the invention, by determining the initial inertia of the system; judging whether the initial inertia of the system is greater than or equal to the inertia requirement; if the initial inertia of the system is less than the inertia requirement, the reactive power response capability of each new energy node is calculated, and the first node is determined based on the reactive power response capability. This can compensate for the inertia deficiency of the power system, and is more conducive to improving the voltage stability and short-circuit capacity of the power system, realizing the synergistic optimization of inertia support and voltage support. It is then judged whether the first node is the same as the first node in the previous configuration scheme. If the first node is different from the first node in the previous configuration scheme, after simulating the grid-type transformation of the first node, the short-circuit ratio of each new energy node is calculated, and the new energy node with a short-circuit ratio less than the short-circuit ratio threshold is designated as the second node. This can take into account the impact of the grid-type transformation on the power system and ensure that the short-circuit ratio calculation can reflect the grid structure. The actual system state after the grid transformation allows for targeted improvement of the short-circuit ratio of weak renewable energy nodes in the power system by configuring synchronous condensers on the second node, ensuring voltage stability and disturbance immunity of the power system. This also makes the synchronous condenser configuration scheme more precise and economical. After simulating the synchronous condenser configuration on the second node, the initial system inertia is redefined, and the step of determining whether the initial system inertia is greater than or equal to the inertia requirement is returned. This effectively avoids redundancy in inertia support capacity caused by repeated configuration, achieving synergistic optimization of grid transformation and synchronous condenser configuration, thereby improving the economic efficiency of the power system configuration scheme. By selecting the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme, a more economical power system configuration scheme can be obtained while satisfying both inertia support and short-circuit ratio constraints. Attached Figure Description

[0011] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a flowchart illustrating a method for determining a power system configuration scheme provided in an embodiment of the present invention; Figure 2 This is another flowchart illustrating the method for determining a power system configuration scheme provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a device for determining a power system configuration scheme provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0013] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0014] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0015] Figure 1 This is a flowchart illustrating a method for determining a power system configuration scheme according to an embodiment of the present invention. This method is applicable to scenarios involving determining the configuration scheme of a power system for a renewable energy power plant. The method can be executed by a device for determining a power system configuration scheme, as provided in this embodiment. This device can be implemented using software and / or hardware. In one specific embodiment, the device can be integrated into an electronic device, such as a computer or workstation. The following embodiment illustrates this using the integration of the device for determining a power system configuration scheme into an electronic device as an example. (See also...) Figure 1 The method for determining the power system configuration scheme in this embodiment may include the following steps: Step 101: Determine the initial inertia of the system.

[0016] The power system in this embodiment can be understood as a power system with new energy nodes as the main grid-connected nodes. A grid-connected node can be understood as a power generation unit and / or power load that is electrically connected to the power grid through a point of common coupling and can exchange power with the grid. Power generation units can be thermal power generating units, wind farms, photovoltaic power plants, etc.

[0017] The power system in this embodiment typically exhibits low inertia and a low short-circuit ratio. Inertia can be understood as a parameter quantifying the power system's ability to resist frequency variations and can be used as an indicator to assess the grid strength of the power system. The short-circuit ratio can be understood as an indicator quantifying the grid strength of a specific grid-connected node in the power system, typically expressed as the ratio of the short-circuit capacity of the grid-connected node to its rated apparent power. The short-circuit capacity of a grid-connected node can be understood as the short-circuit capacity that the grid can provide when a three-phase short-circuit fault occurs at that node, measured in megavolt-amperes (MVA). The rated apparent power of the grid-connected node can be understood as the rated capacity of the generating units connected to that node, also measured in MVA. A high short-circuit ratio at a grid-connected node indicates strong voltage support capability and good system stability at that node; a low short-circuit ratio at a grid-connected node indicates higher grid impedance and a greater susceptibility to voltage fluctuations.

[0018] In a power system, a new energy node can be understood as a grid-connected node of a photovoltaic power station that generates solar power or a wind farm that generates wind power. Specifically, the power generation process of a new energy node is intermittent and fluctuating. When a new energy node adopts a traditional grid-following control strategy, the new energy power generation units, such as wind turbines and photovoltaic inverters, typically use current-source control. Their output power passively follows changes in grid voltage and frequency, lacking the ability to autonomously adjust the frequency, and therefore cannot respond to frequency changes or provide inertia support. However, grid-based modifications or the configuration of synchronous condensers at new energy nodes can improve the inertia support capability of the power system. Grid-based modifications can be based on virtual synchronous generator control technology, using grid-based converters to simulate the swing equations and reactive power and voltage regulation characteristics of synchronous generators, providing active inertia support and voltage regulation capabilities. A synchronous condenser is a rotating dynamic reactive power compensation device that provides natural rotational inertia and strong overcurrent capability through rotor rotation. Configuring synchronous condensers at new energy nodes can compensate for reactive power deficits, thereby improving the short-circuit capacity of the node and suppressing voltage fluctuations.

[0019] The initial inertia of a system can be understood as the initial inertia of the system before configuring the power system using the method provided in this embodiment to determine the power system configuration scheme. The initial inertia can be represented by the inertial time constant, which means the time it takes for the system frequency to drop from its rated value to zero when the total power generation of the system suddenly disappears, measured in seconds. Specifically, in a new energy power system, the initial inertia of the system can be provided by the synchronization units in the power system. Synchronization units refer to all devices capable of providing an immediate active power response to changes in system frequency. The inertia provided by the synchronization units can include the natural rotational inertia provided by the rotating rotor of the synchronous generator, the virtual inertia provided by the virtual synchronous generator control technology of the grid-type converter, and the rotational inertia provided by the synchronous rotating rotor of the synchronous condenser.

[0020] Step 102: Determine whether the initial inertia of the system is greater than or equal to the inertia requirement.

[0021] Inertia requirement refers to the initial inertia of the power system required to ensure that frequency fluctuations during power deficit disturbances meet the conditions for safe and stable operation of the power system. The inertia requirement can be predetermined based on criteria for maintaining power system frequency stability. Optionally, it can be determined using the formula... Determine the inertia requirement value ;in This represents the preset maximum rate of change of frequency in the power system. This is the preset maximum power deficit of the power system. The rated frequency of the power system.

[0022] Specifically, if the initial inertia of the system is greater than or equal to the inertia requirement, it means that the current initial inertia of the power system has met or exceeded the minimum standard required to maintain the stability of the system frequency. Therefore, there is no need to carry out grid-based modifications to increase the inertia support capacity of the system. If the initial inertia of the system is less than the inertia requirement, it means that the current initial inertia of the power system is lower than the safety threshold required to maintain the stability of the frequency. Configuration measures need to be taken, such as grid-based modifications to new energy nodes or the configuration of synchronous condensers to improve their inertia support capacity, so that the initial inertia of the system is greater than or equal to the inertia requirement.

[0023] Step 103: If the initial inertia of the system is less than the inertia requirement, calculate the reactive power response capability of each new energy node and determine the first node based on the reactive power response capability.

[0024] Reactive power response capability can be understood as the quantification of a renewable energy node's ability to support and stabilize voltage by adjusting its reactive power output when the grid voltage fluctuates. Specifically, a strong reactive power response capability indicates that the renewable energy node can quickly and significantly inject or absorb reactive power into the power system during grid voltage fluctuations, making a significant contribution to suppressing grid voltage fluctuations and enhancing local grid strength; a weak reactive power response capability indicates that the renewable energy node has limited voltage regulation effect. The reactive power response capability of a renewable energy node can usually be quantified by the change in its own reactive power output when a unit voltage change is applied.

[0025] The first node can be understood as a new energy node currently identified as being planned for grid-based upgrades. Specifically, since new energy nodes with strong reactive power response capabilities are usually located in critical positions in the power grid, their voltage stability has a significant impact on the overall security of the power system. The method for determining the first node based on reactive power response capability can be as follows: Arrange all new energy nodes in descending order of reactive power response capability, then calculate and simulate the grid-based upgrades for each new energy node to obtain the inertia increment that the upgrades can provide; subsequently, accumulate the inertia increments of each new energy node in descending order of reactive power response capability. When the accumulated inertia increment first exceeds the difference between the inertia requirement and the initial system inertia, the new energy nodes participating in the inertia accumulation are determined as the first node.

[0026] Step 104: Determine whether the first node is the same as the first node in the previous configuration scheme.

[0027] Step 105: If the first node is different from the first node in the previous configuration scheme, after simulating the network structure modification of the first node, calculate the short-circuit ratio of each new energy node, and take the new energy node with a short-circuit ratio less than the short-circuit ratio threshold as the second node.

[0028] Step 106: Determine the current configuration scheme and its corresponding configuration cost. The current configuration scheme is used to indicate the network structure modification of the first node and the synchronous condenser configuration of the second node.

[0029] Step 107: After simulating the configuration of the synchronous camera on the second node, redetermine the initial inertia of the system and return to step 102.

[0030] A configuration scheme can be understood as configuring the hardware and software of a power system to ensure that the configured power system can meet the technical requirements of having an initial inertia greater than or equal to the inertia requirement and a short-circuit ratio greater than or equal to the short-circuit ratio threshold for each renewable energy node within the system. The configuration scheme includes a list of first nodes, i.e., the list of nodes planned for grid-type transformation, and may also include the technical routes for the grid-type transformation of each first node. The configuration scheme also includes a list of nodes planned for synchronous condenser (SCDC) configuration, the total capacity of SCDCs required for each node planned for SCDC configuration, and the number of SCDCs. For example, the current configuration scheme could be: to transform the grid structure of nodes A1, A2, and A3, and to install SCDCs with a capacity of 150 Mvar at nodes A2 and A3 respectively.

[0031] The short-circuit ratio threshold refers to the minimum allowable value of the short-circuit ratio of a renewable energy node to ensure the safe and stable operation of the power system. The short-circuit ratio threshold is usually set according to relevant technical standards. The second node can be understood as the renewable energy node currently identified as being planned to be equipped with synchronous condensers. Specifically, after the grid-type modification of the first node, the equivalent impedance and short-circuit capacity distribution of the renewable energy power system will change, thus affecting the short-circuit ratio of each renewable energy node. Therefore, it is necessary to calculate the short-circuit ratio of each renewable energy node after simulating the grid-type modification of the first node, so as to consider the impact of the grid-type modification on the power system when subsequently determining the configuration scheme of synchronous condensers. If, after simulating the grid-type modification of the first node, the short-circuit ratio of a certain renewable energy node is less than the short-circuit ratio threshold, it can be determined that the renewable energy node needs to be additionally equipped with synchronous condensers to improve short-circuit capacity and enhance voltage support capability. For example, a real-time digital simulation platform containing models of each renewable energy node and an equivalent power grid can be established to simulate the detailed parameters of each renewable energy node after the grid-type modification of the first node, and then calculate the short-circuit ratio of each renewable energy node.

[0032] The current configuration cost includes the cost of upgrading the first node to a network structure and the cost of configuring synchronous condensers on the second node. Specifically, the current configuration cost can be calculated using engineering cost estimation methods, combined with current equipment market prices, installation work quotas, and regional fee standards. The configuration cost may include the equipment purchase cost, installation and commissioning cost, and civil engineering and electrical connection cost for the network upgrade; and the equipment purchase cost, installation and commissioning cost, and foundation and supporting facility construction cost for the synchronous condensers. If a life-cycle cost analysis is used to comprehensively evaluate the current configuration cost, the configuration cost must also include the changes in operation and maintenance costs caused by the network upgrade and synchronous condenser configuration.

[0033] Specifically, since synchronous condensers can also provide natural rotational inertia to support the power system, it is necessary to simulate the configuration of synchronous condensers for the second node, include the inertia increment provided by the synchronous condenser configuration into the initial inertia of the system, update the initial inertia of the system, and return to step 102 to enter the next iteration. This will explore whether introducing the inertia increment provided by the second node into the current system can reduce the number of the first node and avoid configuration redundancy in inertia support capacity.

[0034] In step 104, determining whether the first node is the same as the first node in the previous configuration scheme is to determine whether the first node meets the termination condition of the iteration. If a previous configuration scheme exists, and the first node is the same as the first node in the previous configuration scheme, one possibility is that in step 102, it has already been determined that the initial inertia of the system is greater than or equal to the inertia requirement value. That is, the inertia increment introduced by the synchronous condenser configured in the previous round has already met the dual requirements of inertia support and short-circuit ratio of the power system. Therefore, it is not necessary to execute step 104 to redetermine the first node, and the iteration can be stopped. Another possibility is that step 103 is the minimum value after considering the inertia increment introduced by the synchronous condenser. Further reducing the number of first nodes will still make the initial inertia of the system unable to meet the requirements of the power system. If the current configuration scheme has already ensured the minimum number of first nodes, then the iteration can also be stopped. If a previous configuration scheme exists, and the first node in the current configuration scheme is different from the first node in the previous configuration scheme, then it means that the inertia increment introduced by configuring the second node with a synchronous condenser in the previous configuration scheme is insufficient to meet the inertia requirement of the power system without network structure modification. In step 103, considering the inertia increment introduced by configuring the second node with a synchronous condenser, the number of first nodes can be reduced while ensuring the inertia support requirement of the power system. If a previous configuration scheme does not exist, that is, the current iteration is the first iteration, then it can be directly regarded as the first node being different from the first node in the previous configuration scheme, and step 105 can be executed.

[0035] Step 108: If the first node is the same as the first node in the previous configuration scheme, then select the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme.

[0036] The target configuration scheme refers to the final power system configuration scheme determined in this embodiment.

[0037] Specifically, if the first node is the same as the first node in the previous configuration scheme, it means that the currently determined number of first nodes is the minimum configuration number that satisfies the system inertia requirement and the short-circuit ratio threshold of each node. Therefore, the iterative calculation process can be terminated, and the configuration scheme with the lowest configuration cost among the various configuration schemes determined in multiple rounds of iterative calculations can be taken as the target configuration scheme.

[0038] For example, if the inertia requirement is preset to 6 seconds and the short-circuit ratio threshold is preset to 1.2, the calculated initial inertia of a power system is 4.8 seconds. Firstly, since 4.8 seconds is less than 6 seconds, it is determined that the current system does not meet the minimum inertia requirement. Therefore, it is necessary to calculate the reactive power response capability of each renewable energy node in the power system. If the calculated reactive power response capability ranking of the five renewable energy nodes in the power system is node A2 > node A5 > node A1 > node A3 > node A4, then nodes can be selected sequentially for network configuration modification according to the order of reactive power response capability from strongest to weakest. Simulation calculations show that modifying nodes A2, A5, and A1 respectively can provide inertia increments of 0.8 seconds, 0.7 seconds, and 0.6 seconds, respectively, totaling 2.1 seconds. After modification, the system inertia can reach 4.8 + 2.1 = 6.9 seconds, which is greater than the inertia requirement. Therefore, in the first iteration, nodes A2, A5, and A1 can be determined as the first node. In the first iteration, there is no previous node... Therefore, after modifying the network structure of nodes A2, A5, and A1 in the simulation, the short-circuit ratios of nodes A1, A2, A3, A4, and A5 were calculated respectively. The calculated short-circuit ratios of nodes A2 and A3 were 1 and 1.1 respectively, which are less than the short-circuit ratio threshold. Therefore, nodes A2 and A3 were determined as the second nodes. Further calculations showed that synchronous condensers with a capacity of 150 Mvar were needed to configure nodes A2 and A3 respectively to achieve the desired short-circuit ratio. Greater than 1.2; The current configuration scheme determined in the first iteration is as follows: network transformation of A2, A5 and A1, and the addition of synchronous condensers with a capacity of 150 Mvar to A2 and A3 respectively. The total cost of network transformation is 4.5 million, the total cost of synchronous condenser configuration is 60 million, and the configuration cost corresponding to the current configuration scheme is 64.5 million; After simulating the configuration of synchronous condensers for nodes A2 and A3, the initial inertia of the system is redefined as 5.4 seconds, and the second iteration begins.In the second iteration, the initial system inertia was 5.4 seconds, less than the required inertia of 6 seconds. Therefore, the first node needed to be redefined. Based on the reactive power response capability ranking calculated in the first iteration and the inertia increment corresponding to each new energy node obtained through simulation, it was determined that modifying the network configuration of nodes A2 and A5 could provide a total inertia increment of 1.5 seconds. After the modification, the system inertia would reach 5.4 + 1.5 = 6.9 seconds, which is greater than the required inertia. Therefore, nodes A2 and A5 could be determined as the first nodes in the second iteration. However, the first nodes A2, A5, and A1 determined in the second iteration are different from those determined in the first iteration. Therefore, after simulating the network configuration modification of nodes A2 and A5, the short-circuit ratios of nodes A1, A2, A3, A4, and A5 need to be recalculated to obtain the node... The short-circuit ratios of nodes A2, A5, and A3 are 0.9 and 0.8, respectively, which are less than the short-circuit ratio threshold. Therefore, nodes A2 and A3 are determined as the second nodes. Further calculations show that synchronous condensers with a capacity of 200 Mvar are needed to configure nodes A2 and A3 to make the short-circuit ratio of nodes A2, A5, and A3 greater than 1.2. At this point, the current configuration scheme determined in the second iteration is: to modify the network structure of nodes A2 and A5, and to add synchronous condensers with a capacity of 200 Mvar to nodes A2 and A3. The total cost of the network modification is 3 million, and the total cost of configuring the synchronous condensers is 80 million. The configuration cost corresponding to the current configuration scheme is 83 million. After simulating the configuration of synchronous condensers for nodes A2 and A3, the initial inertia of the system is redefined as 6.2 seconds, and the third iteration begins. In the third iteration, the initial inertia of the system is 6.2 seconds, which is greater than the inertia requirement. Therefore, it is not necessary to redetermine the first node. That is, the first node determined in the third iteration is the same as that determined in the second iteration. At this time, the configuration cost of the configuration scheme determined in the first iteration and the second iteration is compared. The configuration cost corresponding to the configuration scheme obtained in the first iteration is 64.5 million, which is less than the cost of 83 million of the configuration scheme obtained in the first iteration. Therefore, the configuration scheme determined in the second iteration is taken as the target configuration scheme.

[0039] In this embodiment, the initial inertia of the system is determined; it is judged whether the initial inertia is greater than or equal to the inertia requirement; if the initial inertia is less than the inertia requirement, the reactive power response capability of each new energy node is calculated, and the first node is determined based on the reactive power response capability. This can compensate for the inertia deficiency of the power system, and is more conducive to improving the voltage stability and short-circuit capacity of the power system, realizing the synergistic optimization of inertia support and voltage support. It is judged whether the first node is the same as the first node in the previous configuration scheme; if the first node is different from the first node in the previous configuration scheme, after simulating the grid transformation of the first node, the short-circuit ratio of each new energy node is calculated, and the new energy node with a short-circuit ratio less than the short-circuit ratio threshold is taken as the second node. This can take into account the impact of the grid transformation on the power system and ensure that the short-circuit ratio calculation can reflect the grid transformation. The modified actual system state allows for targeted improvement of the short-circuit ratio of weak renewable energy nodes in the power system by configuring synchronous condensers on the second node, ensuring voltage stability and disturbance immunity of the power system. Simultaneously, it makes the synchronous condenser configuration scheme more precise and economical. After simulating the synchronous condenser configuration on the second node, the initial system inertia is redefined, and the step of determining whether the initial system inertia is greater than or equal to the inertia requirement is returned. This effectively avoids redundancy in inertia support capacity caused by repeated configuration, achieving coordinated optimization of grid transformation and synchronous condenser configuration, thereby improving the economic efficiency of the power system configuration scheme. By selecting the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme, a more economical power system configuration scheme can be obtained while satisfying both inertia support and short-circuit ratio constraints.

[0040] The following is combined with Figure 2 The method for determining the power system configuration scheme provided in the embodiments of the present invention is further explained. Figure 2 This is another flowchart illustrating the method for determining a power system configuration scheme provided in an embodiment of the present invention. (See attached diagram.) Figure 2 The method for determining the power system configuration scheme in this embodiment may include the following steps: Step 201: Determine the sum of the capacities of all grid-connected nodes in the power system, wherein grid-connected nodes include renewable energy nodes, or grid-connected nodes include both renewable energy nodes and non-renewable energy nodes.

[0041] In a power system, a new energy node can be understood as a grid-connected node of a photovoltaic power station that is connected to solar power generation or a wind farm that uses wind power generation; a non-new energy node can be understood as a grid-connected node connected to a traditional synchronous generator, which can be a thermal power plant, hydropower plant, nuclear power plant, or gas turbine.

[0042] Step 202: Determine the initial inertia of the system based on the sum of the capacities of all grid-connected nodes, the capacity of the synchronization units in the power system, and their inertia coefficients.

[0043] Optionally, it can be based on the formula Determine the initial inertia H of the system; where k represents the index of the synchronization unit in the system. This represents the capacity of synchronization unit k. This represents the inertia coefficient of synchronization unit k. This represents the sum of the capacities of all connected nodes.

[0044] Synchronization units refer to all devices capable of providing instantaneous active power response to changes in system frequency. Synchronization units can include physical synchronization units and virtual synchronization units. Physical synchronization units can be traditional synchronous generators and synchronous condensers, which provide natural rotational inertia through changes in the kinetic energy of their rotating rotors. Virtual synchronization units can be grid-connected converters, which simulate the provision of virtual inertia by using virtual synchronous generator control technology. The inertia coefficient can be understood as the inertial time constant of the synchronization unit, measured in seconds, used to quantify the inertia support capacity per unit capacity. The inertia coefficient of a physical synchronization unit can be determined by the ratio of its stored kinetic energy at rated speed to its rated capacity. For virtual synchronization units, the inertia coefficient is a configurable control parameter representing the strength of its simulated inertial response. The capacity and inertia coefficient of a synchronization unit can usually be directly determined by the equipment specifications.

[0045] Step 203: Determine whether the initial inertia of the system is greater than or equal to the inertia requirement.

[0046] Step 204: If the initial inertia of the system is greater than or equal to the inertia requirement, then calculate the short-circuit ratio of each new energy node.

[0047] Specifically, if the initial inertia of the system is greater than or equal to the inertia requirement, it indicates that the power system has the inertia support capability required to maintain the stability of the system frequency. Therefore, it is possible to further determine whether the short-circuit ratio of each new energy node meets the short-circuit ratio requirement to ensure the safe and stable operation of the power system.

[0048] Optionally, for any new energy node, calculating the short-circuit ratio of the new energy node includes: determining the short-circuit capacity, apparent power, and equivalent apparent power of the new energy node and other grid-connected nodes respectively; and calculating the short-circuit ratio of the new energy node based on the short-circuit capacity, apparent power, and equivalent apparent power of the new energy node and other grid-connected nodes.

[0049] Specifically, the short-circuit capacity of a new energy node can be used as the ratio of the sum of the equivalent apparent power of other grid-connected nodes and the apparent power of the new energy node.

[0050] Optionally, the short-circuit capacity of the i-th renewable energy node ;in, This represents the nominal bus voltage of the i-th renewable energy node. This represents the actual operating voltage of the i-th renewable energy node. The self-impedance of the i-th renewable energy node is represented; the equivalent apparent power of other grid-connected nodes is represented. Where l represents the index of other grid-connected nodes, and n represents the total number of other grid-connected nodes. This represents the apparent power of other grid-connected nodes l. This indicates the actual operating voltage of other grid-connected nodes l. Represents the mutual impedance between renewable energy node i and grid-connected node l; the short-circuit ratio of the i-th renewable energy node. ;in, It represents the apparent power of the i-th renewable energy node.

[0051] Step 205: If the short-circuit ratio of all new energy nodes is greater than or equal to the short-circuit ratio threshold, keep the power system configuration unchanged.

[0052] Specifically, if the short-circuit ratio of all new energy nodes is greater than or equal to the short-circuit ratio threshold, provided that the initial inertia of the system is greater than or equal to the inertia requirement, it means that the inertia support requirement and the short-circuit ratio requirement of the power system have been met simultaneously, and there is no need to change the power system configuration.

[0053] Step 206: For at least one new energy node whose short-circuit ratio is less than the short-circuit ratio threshold, the new energy node whose short-circuit ratio is less than the short-circuit ratio threshold is taken as the second node. The short-circuit ratio difference is determined according to the short-circuit ratio threshold and the short-circuit ratio corresponding to the second node. The synchronous condenser configuration capacity of the second node is calculated according to the short-circuit ratio difference.

[0054] The short-circuit ratio difference can be understood as the difference between the short-circuit ratio threshold and the short-circuit ratio corresponding to the second node. This difference reflects the relative strength of the power grid that the second node needs to increase to ensure the safe and stable operation of the power system. Specifically, after determining the short-circuit ratio difference, the additional short-circuit capacity required for the second node can be calculated based on the definition of the short-circuit ratio. For example, if the short-circuit ratio of the grid-connected node = the short-circuit capacity of the grid-connected node / the rated apparent power of the grid-connected node, then the additional short-circuit capacity required for the grid-connected node = the short-circuit ratio difference × the rated apparent power of the grid-connected node. Finally, based on the short-circuit capacity provided by the synchronous condenser and the influence of the subtransient reactance of the second node, the minimum rated capacity of the synchronous condenser required to ensure that the short-circuit ratio of the second node is greater than or equal to the short-circuit ratio threshold can be calculated using empirical engineering formulas, and this minimum rated capacity is determined as the synchronous condenser configuration capacity for the second node.

[0055] Step 207: Determine the target configuration scheme, wherein the target configuration scheme is used to indicate the synchronous conversion phase configuration of the second node.

[0056] Specifically, if the initial inertia of the system is greater than or equal to the inertia requirement, there is no need to modify the grid structure of the new energy nodes. Only the second node with a short-circuit ratio less than the short-circuit ratio threshold needs to be configured with synchronous condensers to enable the power system to meet the inertia support requirements and short-circuit ratio requirements. At this time, the target configuration scheme is only used to indicate the synchronous condenser configuration for the second node. The target configuration scheme includes the synchronous condenser capacity required for the second node and the synchronous condenser configuration for the second node.

[0057] Step 208: If the initial inertia of the system is less than the inertia requirement, then calculate the reactive power response capability of each new energy node.

[0058] Optional, the reactive power response capability of the i-th renewable energy node. ; Where j represents the index of the load node in the power system, and m represents the total number of load nodes in the power system. This represents the active power of load node j. This represents the sum of the active power of all load nodes. This represents the active power output of the i-th renewable energy node. This represents the sum of the active power output of all renewable energy nodes. This represents the reactive power output of the i-th renewable energy node. This represents the reactive power of load node j. express right The partial derivatives, express right The partial derivatives of .

[0059] A load node can be understood as a grid-connected node in a power system whose primary function is to consume active and reactive power. A load node typically represents a specific power user or a local network that aggregates multiple electrical devices. The active power of a load node refers to the active power absorbed from the grid under specific operating conditions. The active power of a load node represents the actual rate at which it consumes electrical energy per unit time. The consumed electrical energy is usually converted into other forms of energy, such as mechanical energy and heat energy, to meet the user's electricity needs. The active power output of a renewable energy node refers to the active power injected into the grid by the renewable energy node under specific operating conditions. The active power output of renewable energy nodes is constrained by the immediate availability of wind and solar energy and the operating status of the power plants, exhibiting intermittency and fluctuation. The reactive power of a load node refers to the reactive power absorbed from the grid under specific operating conditions. The reactive power of a load node reflects the exchange power required for the load node to establish and maintain its internal electromagnetic field. It does not directly perform work but directly affects the voltage level and transmission capacity of the grid. The reactive power of a load node is an important factor in maintaining system voltage stability. The reactive power output of a renewable energy node refers to the reactive power injected into or absorbed by the renewable energy node into the grid through its grid connection point under specific operating conditions. Specifically, it is the partial derivative of the reactive power output of renewable energy node i with respect to the active power of load node j. The partial derivative of the reactive power output of new energy node i with respect to the reactive power of load node j The impact of the reactive power output change of the new energy node i on the active and reactive power demand of other load nodes j in the system was quantified.

[0060] Step 209: Sort the new energy nodes in order of reactive power response capability from strong to weak, and calculate the inertia difference between the xth and last new energy nodes before and after the grid configuration transformation.

[0061] Specifically, a reserved integer x (1 ≤ x ≤ total number of renewable energy nodes) is set. After sorting the renewable energy nodes in descending order of reactive power response capability, the top x renewable energy nodes with the strongest reactive power response capability are retained and temporarily excluded from grid-based transformation. The main reasons are as follows: Firstly, in weak grid scenarios, relying solely on the virtual inertia provided by grid-based transformation and the limited short-circuit current of renewable energy nodes may still be insufficient to raise the short-circuit ratio of the x renewable energy nodes with the strongest reactive power response capability to above the short-circuit ratio threshold. Secondly, the stronger the reactive power response capability of a renewable energy node, the more sensitive it is to voltage changes caused by reactive power injection into the grid, and the greater the impact of its power output on grid voltage changes. Configuring synchronous condensers on the x renewable energy nodes with the strongest reactive power response capability can most effectively stabilize the grid voltage and create a more stable grid environment.

[0062] Step 210: Based on the initial inertia, inertia requirement, and inertia difference of the system, select at least one new energy node as the first node from the xth to the last new energy node in sequence.

[0063] Among them, the sum of the inertia differences corresponding to the first node is greater than or equal to the difference between the inertia requirement value and the initial inertia of the system, and the number of the first nodes is the smallest.

[0064] Specifically, following the order of reactive power response capability of the new energy nodes from strongest to weakest as determined in step 209, the inertia difference before and after the grid configuration modification of the xth to the last new energy node can be sequentially added to the initial inertia of the system until the initial inertia of the system is just greater than or equal to the inertia requirement. At the same time, the number of the first node should be minimized.

[0065] For example, assume the initial system inertia is 4.8 seconds, and the preset inertia requirement is 6 seconds. Assume a power system has four renewable energy nodes, ranked by their reactive power response capabilities as follows: A1 > A2 > A3 > A4. If x=1, node A1 will be reserved without network configuration modification; instead, synchronous condensers will be prioritized for configuration at node A1. Subsequently, starting from node A2, the inertia differences before and after network configuration modifications for nodes A2, A3, and A4 will be calculated sequentially. Nodes A2, A3, and A4 provide inertia differences of 0.8 seconds, 0.6 seconds, and 0.4 seconds, respectively. Adding the inertia difference provided by node A3 to the initial system inertia yields 4.8 + 0.8 = 5.6 seconds, which does not meet the required inertia value. Therefore, the inertia difference provided by node A4 is further added to the initial system inertia, resulting in 4.8 + 0.8 + 0.6 = 6.2 seconds, which meets the required inertia value. Therefore, nodes A3 and A4 are determined as the first nodes.

[0066] Step 211: Determine whether the first node is the same as the first node in the previous configuration scheme.

[0067] Step 212: If the first node is different from the first node in the previous configuration scheme, after simulating the network structure modification of the first node, calculate the short-circuit ratio of each new energy node, and take the new energy node with a short-circuit ratio less than the short-circuit ratio threshold as the second node. Determine the short-circuit ratio difference based on the short-circuit ratio threshold and the short-circuit ratio corresponding to the second node; calculate the synchronous condenser configuration capacity of the second node based on the short-circuit ratio difference.

[0068] Step 213: Determine the current configuration scheme and its corresponding configuration cost. The current configuration scheme is used to indicate the network structure modification of the first node and the synchronous condenser configuration of the second node.

[0069] Step 214: After simulating the configuration of the synchronous camera on the second node, redetermine the initial inertia of the system and return to step 203.

[0070] Step 215: If the first node is the same as the first node in the previous configuration scheme, then select the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme.

[0071] In this embodiment, the sum of the capacities of all grid-connected nodes in the power system is determined, where grid-connected nodes include either new energy nodes or both new energy nodes and non-new energy nodes. Based on the sum of the capacities of all grid-connected nodes, the capacity of the synchronization units in the power system, and their inertia coefficients, the initial inertia of the system is determined. This allows for simultaneous consideration of the total inertia provided by each synchronization unit in the power system, more accurately quantifying the inertia support capacity of the power system, and providing a decision-making basis for determining subsequent configuration schemes. It is then determined whether the initial system inertia is greater than or equal to the inertia requirement. If the initial system inertia is greater than or equal to the inertia requirement, then for any given new energy node, the short-circuit condition of that new energy node is determined. The short-circuit capacity, apparent power, and equivalent apparent power of other grid-connected nodes are considered. Based on the short-circuit capacity, apparent power, and equivalent apparent power of other grid-connected nodes, the short-circuit ratio of the new energy node is calculated. This more accurately characterizes the grid strength perceived by the inverter of the new energy node, making the short-circuit ratio calculation more precise and providing a reliable basis for assessing the stability of the new energy node. For cases where the short-circuit ratio of all new energy nodes is greater than or equal to the short-circuit ratio threshold, the power system configuration remains unchanged. For cases where the short-circuit ratio of at least one new energy node is less than the short-circuit ratio threshold, the new energy node with a short-circuit ratio less than the threshold is designated as the second node. The short-circuit ratio threshold and the second node are then compared... The short-circuit ratio is determined, and the short-circuit ratio difference is calculated. Based on the short-circuit ratio difference, the synchronous condenser configuration capacity of the second node is calculated. A target configuration scheme is determined, which indicates the synchronous condenser configuration for the second node. This target scheme considers the impact of grid transformation on the power system, ensuring that the short-circuit ratio calculation reflects the actual system state after grid transformation. This allows the synchronous condenser configuration for the second node to specifically improve the short-circuit ratio of weak renewable energy nodes in the power system, ensuring voltage stability and disturbance rejection capability of the power system. Simultaneously, it makes the synchronous condenser configuration scheme more accurate and economical. The synchronous condenser configuration capacity calculated based on the short-circuit ratio difference provides a basis for synchronous condenser configuration. The system provides clear and unambiguous technical specifications; if the initial inertia of the system is less than the inertia requirement, the reactive power response capability of each new energy node is calculated separately; based on the initial inertia of the system, the inertia requirement, and the inertia difference, at least one new energy node is selected sequentially from the xth to the last new energy node as the first node. This allows the synchronous condensers, which simultaneously provide inertia support and enhance grid strength, to be preferentially configured on the key nodes that have the greatest impact on system voltage and support capability, thus stabilizing grid voltage more effectively and creating a more stable grid environment.If the first node is different from the first node in the previous configuration scheme, after simulating the network modification of the first node, the short-circuit ratio of each new energy node is calculated, and the new energy nodes with short-circuit ratios less than the short-circuit ratio threshold are designated as the second nodes. The short-circuit ratio difference is determined based on the short-circuit ratio threshold and the corresponding short-circuit ratio of the second node. The synchronous condenser configuration capacity of the second node is calculated based on the short-circuit ratio difference. The current configuration scheme and its corresponding configuration cost are determined, where the current configuration scheme is used to indicate the network modification of the first node and the synchronous condenser configuration of the second node. The synchronous condenser configuration capacity of the second node is then simulated. After configuring the synchronous condenser, the initial system inertia is redefined, and the process returns to determine whether the initial system inertia is greater than or equal to the inertia requirement. This effectively avoids redundancy in inertia support capacity caused by repeated configuration, achieving coordinated optimization of grid transformation and synchronous condenser configuration, thereby improving the economy of power system configuration schemes. If the first node is the same as the first node in the previous configuration scheme, the scheme with the lowest configuration cost is selected from all currently determined configuration schemes as the target configuration scheme. This allows for a more economical power system configuration scheme while satisfying both inertia support and short-circuit ratio constraints.

[0072] Figure 3 This is a schematic diagram of a power system configuration scheme determination device provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the device includes: The determination module 301 is used to determine the initial inertia of the system and to determine whether the initial inertia of the system is greater than or equal to the inertia requirement value. The first determining module 302 is used to calculate the reactive power response capability of each new energy node if the initial inertia of the system is less than the inertia requirement value, and determine the first node based on the reactive power response capability. The second determining module 303 is used to calculate the short-circuit ratio of each new energy node after simulating the network transformation of the first node if the first node is different from the first node in the previous configuration scheme, and to take the new energy node with a short-circuit ratio less than the short-circuit ratio threshold as the second node. The cost determination module 304 is used to determine the current configuration scheme and its corresponding configuration cost. The current configuration scheme is used to indicate the network structure modification of the first node and the synchronous condenser configuration of the second node. The third determining module 305 is used to redetermine the initial inertia of the system after simulating the synchronous adjustment of the second node, and return to the step of judging whether the initial inertia of the system is greater than or equal to the inertia requirement value, until the first node is the same as the first node in the previous configuration scheme. The selection module 306 is used to select the scheme with the lowest configuration cost from all currently determined configuration schemes if the first node is the same as the first node in the previous configuration scheme.

[0073] In one embodiment, the device further includes a fourth determining module, used to calculate the short-circuit ratio of each new energy node if the initial inertia of the system is greater than or equal to the inertia requirement value; If the short-circuit ratio of all new energy nodes is greater than or equal to the short-circuit ratio threshold, the power system configuration scheme remains unchanged. If the short-circuit ratio of at least one new energy node is less than the short-circuit ratio threshold, the new energy node with the short-circuit ratio less than the short-circuit ratio threshold is designated as the second node, and a target configuration scheme is determined. The target configuration scheme is used to indicate the synchronous condenser configuration for the second node.

[0074] In one embodiment, the first determining module 302 determines the first node based on reactive power response capability, including: The new energy nodes are sorted in order of reactive power response capability from strong to weak, and the inertia difference between the xth and last new energy nodes before and after the grid configuration modification is calculated. Based on the initial inertia, inertia requirement, and inertia difference of the system, at least one new energy node is selected sequentially from the xth to the last new energy node as the first node. Among them, the sum of the inertia differences corresponding to the first node is greater than or equal to the difference between the inertia requirement and the initial inertia of the system, and the number of first nodes is the smallest.

[0075] In one embodiment, the apparatus further includes: a capacity determination module, used to, after designating new energy nodes with short-circuit ratios less than a short-circuit ratio threshold as second nodes: The short-circuit ratio difference is determined based on the short-circuit ratio threshold and the short-circuit ratio corresponding to the second node; Calculate the synchronous condenser configuration capacity of the second node based on the short-circuit ratio difference.

[0076] In one embodiment, the determining module 301 determines the initial inertia of the system by: Determine the sum of the capacities of all grid-connected nodes in the power system, wherein grid-connected nodes include renewable energy nodes, or grid-connected nodes include both renewable energy nodes and non-renewable energy nodes; The initial inertia of the system is determined by the sum of the capacities of all grid-connected nodes, the capacity of the synchronization units in the power system, and their inertia coefficients.

[0077] In one embodiment, the reactive power response capability of the i-th renewable energy node ; Where j represents the index of the load node in the power system, and m represents the total number of load nodes in the power system. This represents the active power of load node j. This represents the sum of the active power of all load nodes. This represents the active power output of the i-th renewable energy node. This represents the sum of the active power output of all renewable energy nodes. This represents the reactive power output of the i-th renewable energy node. This represents the reactive power of load node j. express right The partial derivatives, express right The partial derivatives of .

[0078] In one embodiment, for any new energy node, the short-circuit ratio of the new energy node is calculated, including: The short-circuit capacity and apparent power of the new energy node and the equivalent apparent power of other new energy nodes are determined respectively. The short-circuit ratio of the new energy node is calculated based on the short-circuit capacity and apparent power of the new energy node and the equivalent apparent power of other new energy nodes.

[0079] In one embodiment, the short-circuit capacity of the i-th new energy node ;in, This represents the nominal bus voltage of the i-th renewable energy node. This represents the actual operating voltage of the i-th renewable energy node. This represents the self-impedance of the i-th renewable energy node; Equivalent apparent power of other new energy nodes Where l represents the index of other grid-connected nodes, and n represents the total number of other grid-connected nodes. This represents the apparent power of other grid-connected nodes l. This indicates the actual operating voltage of other grid-connected nodes l. This represents the mutual impedance between the new energy node i and the grid-connected node l; Short-circuit ratio of the i-th renewable energy node ;in, It represents the apparent power of the i-th renewable energy node.

[0080] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is merely an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the functional modules described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0081] The apparatus of this invention determines the initial inertia of the system; determines whether the initial inertia is greater than or equal to the inertia requirement; if the initial inertia is less than the inertia requirement, it calculates the reactive power response capability of each new energy node and determines the first node based on the reactive power response capability. This not only compensates for the inertia deficit in the power system but also improves the voltage stability and short-circuit capacity of the power system, achieving synergistic optimization of inertia support and voltage support. It then determines whether the first node is the same as the first node in the previous configuration scheme; if the first node is different, it calculates the short-circuit ratio of each new energy node after simulating a network modification of the first node, and designates new energy nodes with short-circuit ratios less than a threshold as the second node. This approach considers the impact of network modification on the power system and ensures that the short-circuit ratio calculation reflects the network structure. The actual system state after the grid transformation allows for targeted improvement of the short-circuit ratio of weak renewable energy nodes in the power system by configuring synchronous condensers at the second node, ensuring voltage stability and disturbance immunity of the power system. This also makes the synchronous condenser configuration scheme more precise and economical. After simulating the synchronous condenser configuration at the second node, the initial system inertia is redefined, and the step of determining whether the initial system inertia is greater than or equal to the inertia requirement is returned. This effectively avoids redundancy in inertia support capacity caused by repeated configuration, achieving synergistic optimization of grid transformation and synchronous condenser configuration, thereby improving the economic efficiency of the power system configuration scheme. By selecting the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme, a more economical power system configuration scheme can be obtained while satisfying both inertia support and short-circuit ratio constraints.

[0082] The following is for reference. Figure 4 It shows a schematic diagram of the structure of a computer system 400 suitable for implementing an electronic device according to embodiments of the present invention. Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0083] like Figure 4 As shown, the computer system 400 includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 402 or programs loaded from storage section 408 into random access memory (RAM) 403. The RAM 403 also stores various programs and data required for the operation of the computer system 400. The CPU 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0084] The following components are connected to I / O interface 405: input section 406 including keyboard, mouse, etc.; output section 407 including cathode ray tube, liquid crystal display, etc., and speakers, etc.; storage section 408 including hard disk, etc.; and communication section 409 including network interface card, such as modem, etc. Communication section 409 performs communication processing via a network such as the Internet. Drive 410 is also connected to I / O interface 405 as needed. Removable media 411, such as disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 410 as needed so that computer programs read from them can be installed into storage section 408 as needed.

[0085] In particular, according to the embodiments disclosed in this invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 409, and / or installed from removable medium 411. When the computer program is executed by central processing unit (CPU) 401, it performs the functions defined above in the system of this invention.

[0086] It should be noted that the computer-readable medium shown in this invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, etc., or any suitable combination thereof.

[0087] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0088] The modules and / or units described in the embodiments of the present invention can be implemented in software or hardware. The described modules and / or units can also be housed in a processor; for example, a processor can be described as including a determining module, a first determining module, a second determining module, a cost determining module, a third determining module, and a selection module. The names of these modules do not necessarily constitute a limitation on the module itself.

[0089] In another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiments; or it may exist independently and not assembled into the device. The computer-readable medium carries one or more programs, which, when executed by the device, cause the device to include: Determine the initial system inertia and check if it is greater than or equal to the inertia requirement. If the initial system inertia is less than the inertia requirement, calculate the reactive power response capability of each renewable energy node and determine the first node based on the reactive power response capability. If the first node is different from the first node in the previous configuration scheme, after simulating the network configuration modification of the first node, calculate the short-circuit ratio of each renewable energy node and designate the renewable energy node with a short-circuit ratio less than the short-circuit ratio threshold as the second node. Determine the current configuration scheme and its corresponding configuration cost, where the current configuration scheme is used to indicate the network configuration modification of the first node and the synchronous condenser configuration of the second node. After simulating the synchronous condenser configuration of the second node, redetermine the initial system inertia and return to the step of checking if the initial system inertia is greater than or equal to the inertia requirement until the first node is the same as the first node in the previous configuration scheme. If the first node is the same as the first node in the previous configuration scheme, select the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme.

[0090] The technical solution of this invention determines the initial inertia of the system; determines whether the initial inertia is greater than or equal to the inertia requirement; if the initial inertia is less than the inertia requirement, the reactive power response capability of each new energy node is calculated, and the first node is determined based on the reactive power response capability. This not only compensates for the inertia deficit in the power system but also improves the voltage stability and short-circuit capacity of the power system, achieving synergistic optimization of inertia support and voltage support. It also determines whether the first node is the same as the first node in the previous configuration scheme; if the first node is different, after simulating the grid modification of the first node, the short-circuit ratio of each new energy node is calculated, and new energy nodes with short-circuit ratios less than the short-circuit ratio threshold are designated as the second node. This approach considers the impact of grid modification on the power system and ensures that the short-circuit ratio calculation reflects the desired performance. The actual system state after the grid-based transformation allows for targeted improvement of the short-circuit ratio of weak renewable energy nodes in the power system by configuring synchronous condensers at the second node, ensuring voltage stability and disturbance immunity of the power system. This also makes the synchronous condenser configuration scheme more precise and economical. After simulating the synchronous condenser configuration at the second node, the initial system inertia is redefined, and the step of determining whether the initial system inertia is greater than or equal to the inertia requirement is returned. This effectively avoids redundancy in inertia support capacity caused by repeated configuration, achieving synergistic optimization of grid-based transformation and synchronous condenser configuration, thereby improving the economic efficiency of the power system configuration scheme. By selecting the scheme with the lowest configuration cost from all currently determined configuration schemes as the target configuration scheme, a more economical power system configuration scheme can be obtained while satisfying both inertia support and short-circuit ratio constraints.

[0091] This invention also provides a computer program product, including a computer program that, when executed by a processor, implements a method for determining a power system configuration scheme as provided in any embodiment of this invention.

[0092] In the implementation of a computer program product, computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages ​​as well as conventional procedural programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including local area networks (LANs) or wide area networks (WANs), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0093] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0094] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for determining a power system configuration scheme, characterized in that, The power system includes at least multiple new energy nodes, and the method includes: Determine the initial inertia of the system and determine whether the initial inertia of the system is greater than or equal to the inertia requirement value; If the initial inertia of the system is less than the inertia requirement, the reactive power response capability of each new energy node is calculated, and the first node is determined based on the reactive power response capability. If the first node is different from the first node in the previous configuration scheme, after simulating the network transformation of the first node, the short-circuit ratio of each new energy node is calculated, and the new energy node with a short-circuit ratio less than the short-circuit ratio threshold is taken as the second node. Determine the current configuration scheme and its corresponding configuration cost, wherein the current configuration scheme is used to indicate the network structure modification of the first node and the synchronous condenser configuration of the second node; After simulating the synchronous adjustment configuration of the second node, the initial inertia of the system is re-determined, and the step of determining whether the initial inertia of the system is greater than or equal to the inertia requirement value is returned to be executed until the first node is the same as the first node in the previous configuration scheme. If the first node is the same as the first node in the previous configuration scheme, then the scheme with the lowest configuration cost is selected from all currently determined configuration schemes as the target configuration scheme.

2. The method according to claim 1, characterized in that, The method further includes: If the initial inertia of the system is greater than or equal to the inertia requirement, then the short-circuit ratio of each new energy node is calculated separately. If the short-circuit ratio of all new energy nodes is greater than or equal to the short-circuit ratio threshold, the power system configuration scheme remains unchanged. If the short-circuit ratio of at least one new energy node is less than the short-circuit ratio threshold, the new energy node with the short-circuit ratio less than the short-circuit ratio threshold is designated as the second node, and a target configuration scheme is determined, wherein the target configuration scheme is used to indicate the synchronous condenser configuration for the second node.

3. The method according to claim 1, characterized in that, The step of determining the first node based on the reactive power response capability includes: The new energy nodes are sorted in order of reactive power response capability from strong to weak, and the inertia difference between the xth and last new energy nodes before and after the grid configuration transformation is calculated. Based on the initial inertia of the system, the inertia requirement value, and the inertia difference value, at least one new energy node is sequentially selected as the first node from the xth to the last new energy node. The sum of the inertia differences corresponding to the first node is greater than or equal to the difference between the inertia requirement value and the initial inertia of the system, and the number of the first nodes is the smallest.

4. The method according to claim 1 or 2, characterized in that, After designating new energy nodes with short-circuit ratios less than a short-circuit ratio threshold as second nodes, the method further includes: The short-circuit ratio difference is determined based on the short-circuit ratio threshold and the short-circuit ratio corresponding to the second node; The synchronous condenser configuration capacity of the second node is calculated based on the short-circuit ratio difference.

5. The method according to claim 1, characterized in that, Determining the initial inertia of the system includes: Determine the sum of the capacities of all grid-connected nodes in the power system, wherein the grid-connected nodes include the new energy nodes, or the grid-connected nodes include both new energy nodes and non-new energy nodes; The initial inertia of the system is determined based on the sum of the capacities of all grid-connected nodes, the capacity of the synchronization unit in the power system, and its inertia coefficient.

6. The method according to claim 1, characterized in that, Reactive power response capability of the i-th renewable energy node ; Where j represents the index of the load node in the power system, and m represents the total number of load nodes in the power system. This represents the active power of load node j. This represents the sum of the active power of all load nodes. This represents the active power output of the i-th renewable energy node. This represents the sum of the active power output of all renewable energy nodes. This represents the reactive power output of the i-th renewable energy node. This represents the reactive power of load node j. express right The partial derivatives, express right The partial derivatives of .

7. The method according to claim 1, characterized in that, For any given renewable energy node, calculating the short-circuit ratio of that renewable energy node includes: The short-circuit capacity and apparent power of the new energy node and the equivalent apparent power of other grid-connected nodes are determined respectively. The short-circuit ratio of the new energy node is calculated based on its short-circuit capacity, apparent power, and the equivalent apparent power of other grid-connected nodes.

8. The method according to claim 7, characterized in that, Short - circuit capacity of the i - th new - energy node ; where represents the nominal bus voltage of the i - th new - energy node, represents the actual operating voltage of the i - th new - energy node, represents the self - impedance of the i - th new - energy node; Equivalent apparent power of other new energy nodes Where l represents the index of other grid-connected nodes, and n represents the total number of other grid-connected nodes. This represents the apparent power of other grid-connected nodes l. This indicates the actual operating voltage of other grid-connected nodes l. This represents the mutual impedance between the new energy node i and the grid-connected node l; Short-circuit ratio of the i-th renewable energy node ;in, It represents the apparent power of the i-th renewable energy node.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes a program to implement the method for determining a power system configuration scheme as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the method for determining a power system configuration scheme as described in any one of claims 1 to 8.

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