Methods and devices for power exchange between converter stations in distribution areas

Abstract

This invention belongs to the field of power system technology and discloses a method and apparatus for power mutual assistance between converter stations in a distribution substation area. The method includes: determining the power status of a flexible DC interconnection system with multiple distribution substation areas according to a pre-established energy management strategy; initiating power mutual assistance between distribution substations in a target area when the power status meets preset conditions; in response to the power mutual assistance between distribution substations, determining the target distribution substation with a power deficit and the deficit power of the target distribution substation; calculating the power status of other distribution substations in the target area, and determining a power mutual assistance strategy based on the power status of the other distribution substations and the deficit power of the target distribution substation; wherein, the other distribution substations are distribution substations in the target area other than the target distribution substation. The method and apparatus provided by this invention meet the power mutual assistance needs between converter stations in a flexible DC interconnection system with multiple distribution substation areas.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and in particular to a method and apparatus for power mutual assistance between converter stations in a distribution substation area. Background Technology

[0002] With the increasing electricity load, there is a serious pressure to expand the capacity of early distribution substations. Expanding distribution substations requires consideration of issues such as load transfer, land use, and environmental protection in the short term. Furthermore, the renovation and expansion of distribution substations require huge costs. While expansion can solve the problems, the investment is too large.

[0003] Considering the differences in load rates among distribution substations, flexible DC interconnection is used to achieve a uniform load distribution across all substations. This approach alleviates the expansion pressure on heavily loaded substations while improving equipment utilization in substations with lower load rates, fully leveraging their potential. Simultaneously, with the integration of numerous renewable energy sources into the traditional power system, since renewable energy sources such as photovoltaics are DC power sources, integrating them into the traditional distribution system requires additional converter devices. This not only increases the installation cost of renewable energy sources but also reduces system efficiency due to converter losses. Interconnecting distribution substations via flexible DC interconnection provides a direct DC path for renewable energy sources, facilitating rapid and convenient integration without adding extra converter devices or incurring additional losses, thus ensuring system efficiency.

[0004] The capacity determination problem is one of the important issues that needs to be addressed in flexible DC interconnection systems. In flexible DC interconnection systems with multiple distribution substations, the capacity determination problem of converter stations needs to consider not only the capacity of the original distribution substation and the load capacity, but also the power mutual support problem between converter stations in the distribution substations.

[0005] Therefore, providing a method and apparatus for power mutual assistance between converter stations in a distribution substation area to meet the power mutual assistance needs between converter stations in a flexible DC interconnection system with multiple distribution substation areas has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides a method and apparatus for power exchange between converter stations in a distribution substation area to meet the power exchange needs between converter stations in a flexible DC interconnection system with multiple distribution substation areas. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general description, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0007] According to a first aspect of the present invention, a method for power mutual assistance between converter stations in a distribution radio area is provided.

[0008] In some embodiments, the method includes:

[0009] The power status of the flexible DC interconnection system for multiple distribution substations is determined based on a pre-defined energy management strategy.

[0010] When the power status meets the preset conditions, power mutual assistance between distribution stations within the target area is initiated.

[0011] In response to the power mutual assistance between the distribution stations, the target distribution station with the power deficit and the power deficit of the target distribution station are determined;

[0012] Calculate the power status of other distribution stations within the target area, and determine a power mutual assistance strategy based on the power status of the other distribution stations and the power deficit of the target distribution station; wherein, the other distribution stations are distribution stations in the target area other than the target distribution station.

[0013] In some embodiments, determining the power state of a multi-distribution area flexible DC interconnection system according to a pre-defined energy management strategy specifically includes:

[0014] Calculate the real-time power difference of the flexible DC interconnection system for the multiple distribution stations;

[0015] If the real-time power difference reaches a preset difference threshold, then the real-time power difference is determined to meet the preset condition.

[0016] In some embodiments, the real-time power difference P of the flexible DC interconnection system of the multi-distribution station area is calculated using a first preset formula. imb (t);

[0017] The first preset formula is:

[0018] P pv (t)-P l o ad (t)=P imb (t)

[0019] In the formula, P pv (t) represents the power generation of the photovoltaic system at time t, P load (t) represents the load power demand at the current time t.

[0020] In some embodiments, the preset condition is: the current energy storage state of the target distribution station does not allow charging or discharging, or the energy storage charging and discharging power cannot meet the system power difference.

[0021] In some embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0022] If all other distribution stations are in a state of sufficient power, at least one of the other distribution stations shall be identified as the power supply distribution station.

[0023] In some embodiments, when all other distribution stations are in a state of sufficient power, determining at least one of the other distribution stations as the power supply distribution station specifically includes:

[0024] With all other distribution stations in a state of sufficient power, obtain the distance between each of the other distribution stations and the target distribution station;

[0025] The other distribution stations that are closest to the target distribution station are identified as candidate distribution stations;

[0026] The alternative distribution radio station is used as the power distribution radio station.

[0027] In some embodiments, the other distribution stations with the smallest distance from the target distribution station are determined as candidate distribution stations, and the process further includes:

[0028] Obtain the excess power value of the candidate radio stations;

[0029] If the excess power value is greater than or equal to the deficit power of the target distribution station, then the alternative distribution station is used as the power supply distribution station.

[0030] In some embodiments, the excess power value of the candidate radio stations is obtained, and then the method further includes:

[0031] If the excess power value is less than the deficit power of the target distribution station, then at least one other distribution station is added together with the alternative distribution station as the power supply distribution station.

[0032] In some embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0033] If all other distribution stations are in a state of full power, and the sum of the excess power values ​​of all other distribution stations is less than the shortage power of the target distribution station, then the target distribution station is instructed to purchase power.

[0034] In some embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0035] When there are at least two target distribution stations, determine the excess power of each of the other distribution stations;

[0036] If the excess power of one of the other distribution stations is greater than or equal to the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a power supply distribution station.

[0037] In some embodiments, when there are at least two target distribution stations, determining the excess power of each of the other distribution stations, and then further comprising:

[0038] If the excess power of one of the other distribution stations is greater than the deficit power of any of the target distribution stations, but less than the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a candidate distribution station.

[0039] In some embodiments, determining the other distribution station as a candidate distribution station further includes:

[0040] If the excess power of the alternative distribution station is greater than the deficit power of any of the target distribution stations, then the alternative distribution station shall be used as the power supply distribution station for the target distribution station.

[0041] In some embodiments, determining the other distribution station as a candidate distribution station further includes:

[0042] If the excess power of the candidate radio station is greater than the deficit power of at least two of the target radio stations, then the distance between the candidate radio station and each of the target radio stations is obtained.

[0043] The alternative distribution station is the power supply distribution station of the target distribution station that is closest to the alternative distribution station.

[0044] In some embodiments, the multi-distribution station area flexible DC interconnection system includes at least three distribution stations.

[0045] According to a second aspect of the present invention, a power mutual assistance device between converter stations in a distribution substation area is provided.

[0046] In some embodiments, the device includes:

[0047] The power state determination unit is used to determine the power state of the flexible DC interconnection system of multiple distribution substations according to a pre-defined energy management strategy.

[0048] A trigger condition response unit is used to initiate power mutual assistance between distribution stations within the target area when the power state meets preset conditions.

[0049] A power deficit determination unit is used to determine the target distribution station with a power deficit and the power deficit of the target distribution station in response to the power mutual assistance between the distribution stations.

[0050] The mutual assistance strategy generation unit is used to calculate the power status of other distribution stations in the target area, and determine the power mutual assistance strategy based on the power status of the other distribution stations and the power deficit of the target distribution station; wherein, the other distribution stations are distribution stations in the target area other than the target distribution station.

[0051] According to a third aspect of the present invention, a computer device is provided.

[0052] In some embodiments, the computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0053] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0054] The present invention provides a method and apparatus for power mutual assistance between converter stations in a distribution substation area. Based on a pre-defined energy management strategy, the method determines the power status of a flexible DC interconnection system across multiple distribution substation areas. When the power status meets preset conditions, power mutual assistance between distribution substations within a target area is initiated. In response to the power mutual assistance, the method identifies the target distribution substation with a power deficit and its deficit power. The method calculates the power status of other distribution substations within the target area and determines a power mutual assistance strategy based on the power status of the other distribution substations and the deficit power of the target distribution substation. The other distribution substations are those within the target area other than the target distribution substation.

[0055] Thus, this invention addresses the capacity limitation problem of converter stations by first formulating an energy management strategy for flexible DC interconnection systems with new energy access, and then proposing an inter-station power mutual assistance strategy based on this energy management strategy. This satisfies the power mutual assistance needs between converter stations in a flexible DC interconnection system with multiple distribution substations, optimizes the degree of power mutual assistance, improves the utilization rate of distribution substation equipment, reduces the pressure of capacity expansion, and enhances the economic efficiency of power distribution system operation.

[0056] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0057] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0058] Figure 1 This is one of the flowcharts illustrating a power mutual assistance method between converter stations in a distribution substation according to an exemplary embodiment;

[0059] Figure 2 This is a second flowchart illustrating a power mutual assistance method between converter stations in a distribution substation, according to an exemplary embodiment.

[0060] Figure 3 This is the third flowchart illustrating a power mutual assistance method between converter stations in a distribution substation, according to an exemplary embodiment.

[0061] Figure 4 This is the fourth flowchart illustrating a power mutual assistance method between converter stations in a distribution substation, according to an exemplary embodiment.

[0062] Figure 5 This is the fifth flowchart illustrating a power mutual assistance method between converter stations in a distribution substation, according to an exemplary embodiment.

[0063] Figure 6 This is a structural block diagram of a power mutual assistance device between converter stations in a distribution substation, according to an exemplary embodiment.

[0064] Figure 7 This is a schematic diagram of the structure of a computer device according to an exemplary embodiment.

[0065] Figure label:

[0066] 601-Power state determination unit, 602-Trigger condition response unit, 603-Deficit power determination unit, 604-Mutual assistance strategy generation unit. Detailed Implementation

[0067] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0068] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0069] In this document, unless otherwise stated, the term "multiple" means two or more.

[0070] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0071] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0072] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0073] Please refer to Figure 1 , Figure 1 This is one of the flowcharts illustrating a power mutual assistance method between converter stations in a distribution substation according to an exemplary embodiment.

[0074] In one specific embodiment, the power mutual assistance method between converter stations in a distribution substation area provided by the present invention includes the following steps:

[0075] S110: Determine the power status of a multi-distribution station flexible DC interconnection system, which includes at least three distribution stations, according to a pre-established energy management strategy.

[0076] S120: When the power state meets the preset conditions, start the power mutual assistance between distribution stations in the target area; in some embodiments, the preset conditions are: the current energy storage state of the target distribution station does not allow charging and discharging or the energy storage charging and discharging power cannot meet the system power difference.

[0077] S130: In response to the power mutual assistance between the distribution stations, determine the target distribution station with power deficit and the power deficit of the target distribution station;

[0078] S140: Calculate the power status of other distribution stations in the target area, and determine a power mutual assistance strategy based on the power status of the other distribution stations and the power deficit of the target distribution station; wherein, the other distribution stations are distribution stations in the target area other than the target distribution station.

[0079] In step S110, the power state of the multi-distribution station flexible DC interconnection system is determined according to a pre-defined energy management strategy, such as... Figure 2 As shown, the specific steps include:

[0080] S210: Calculate the real-time power difference of the flexible DC interconnection system of the multi-distribution station area;

[0081] S220: If the real-time power difference reaches a preset difference threshold, then the real-time power difference is determined to meet the preset condition.

[0082] Specifically, the real-time power difference P of the flexible DC interconnection system of the multi-distribution station area is calculated using a first preset formula. imb (t);

[0083] The first preset formula is:

[0084] P pv (t)-P load (t)=Pimb (t)

[0085] In the formula, P pv (t) represents the power generation of the photovoltaic system at time t, P load (t) represents the load power demand at the current time t.

[0086] In a specific use case, such as Figure 3 As shown, taking a photovoltaic-connected interconnected system as an example, in the optimized operation of a flexible DC interconnected system with multiple distribution substations connected to both new energy sources and energy storage, a power differential P is introduced to ensure priority consumption of new energy sources. imb Let represent the difference between the power output of new energy sources and the power demand of the load in the system at the current moment, that is:

[0087] P pv (t)-P load (t)=P imb (t) (1)

[0088] In the formula, P pv (t) represents the power generation of the photovoltaic system at time t, P load (t) represents the load power demand at the current time t.

[0089] Considering the power balance between flexible DC interconnection systems in distribution substations and the randomness of photovoltaic output, a power difference P is established. imb To determine the short-term optimal scheduling strategy for the 1-hour timeframe, the first step is to calculate the real-time power difference P. imb The system power state is determined based on the power difference. This is because the power difference P is eliminated through the power grid. imb This would increase operating costs and, based on the principle of prioritizing local consumption, this embodiment prioritizes balancing the power difference through energy storage. When the current state of energy storage does not allow charging or discharging, or when the charging and discharging power of energy storage cannot meet the system power difference, power exchange between distribution substations is initiated. If power exchange still cannot meet the system power difference, purchasing / selling electricity from the grid is considered.

[0090] In step S140, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0091] If all other distribution stations are in a state of sufficient power, at least one of the other distribution stations shall be identified as the power supply distribution station.

[0092] In practical applications, various scenarios may arise, such as the existence of multiple other distribution radios capable of supplying power to the target distribution radio, enabling mutual support. In such cases, if... Figure 4 As shown, the specific steps include:

[0093] S410: If all other distribution stations are in a state of sufficient power, obtain the distance between each of the other distribution stations and the target distribution station;

[0094] S420: Determine the other distribution station with the smallest distance from the target distribution station as the alternative distribution station;

[0095] S430: Use the alternative distribution radio station as the power distribution radio station.

[0096] In other words, when there are multiple alternative distribution stations that can supply power to the target distribution station, it is preferable to use the nearest alternative distribution station as the power supply distribution station to provide mutual support to the target distribution station.

[0097] Further, the other distribution stations with the smallest distance from the target distribution station are identified as candidate distribution stations, and the process further includes:

[0098] Obtain the excess power value of the candidate radio stations;

[0099] If the excess power value is greater than or equal to the deficit power of the target distribution station, then the alternative distribution station is used as the power supply distribution station.

[0100] The process of obtaining the excess power value of the candidate radio stations further includes:

[0101] If the excess power value is less than the deficit power of the target distribution station, then at least one other distribution station is added together with the alternative distribution station as the power supply distribution station.

[0102] In other words, after the power distribution station is determined, if the excess power value of the power distribution station can meet the shortfall power requirement of the target distribution station, then the power distribution station and the target distribution station will complement each other; if the excess power value of the power distribution station cannot meet the shortfall power requirement of the target distribution station, then other additional distribution stations will be introduced, so that the other additional distribution stations, the power distribution station and the target distribution station will complement each other.

[0103] In other embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0104] If all other distribution stations are in a state of full power, and the sum of the excess power values ​​of all other distribution stations is less than the shortage power of the target distribution station, then the target distribution station is instructed to purchase power.

[0105] Wherein, when there are at least two target distribution stations, the excess power of each of the other distribution stations is determined;

[0106] If the excess power of one of the other distribution stations is greater than or equal to the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a power supply distribution station.

[0107] Furthermore, when there are at least two target distribution stations, the excess power of each of the other distribution stations is determined, followed by:

[0108] If the excess power of one of the other distribution stations is greater than the deficit power of any of the target distribution stations, but less than the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a candidate distribution station.

[0109] If the excess power of the alternative distribution station is greater than the deficit power of any of the target distribution stations, then the alternative distribution station shall be used as the power supply distribution station for the target distribution station.

[0110] If the excess power of the candidate radio station is greater than the deficit power of at least two of the target radio stations, then the distance between the candidate radio station and each of the target radio stations is obtained.

[0111] The alternative distribution station is the power supply distribution station of the target distribution station that is closest to the alternative distribution station.

[0112] To facilitate understanding, we will take the case of three distribution radio areas, A, B, and C, as an example to briefly describe the implementation process of the mutual assistance strategy.

[0113] like Figure 5 As shown, consider three flexible DC interconnected converter stations A, B, and C. Let the current operating power of the three converter stations be P, respectively. A P B P C The power mutual assistance strategy between converter stations can be specifically defined as follows:

[0114] Case 1: One converter station has a power deficit, while the other converter stations have sufficient power (taking converter station A as an example). Converter station A experiences a power deficit of ΔP. A Based on the distance between converter stations, the closer converter station is selected for power sharing. Assuming converter station B is the closer converter station, the power status of converter station B is assessed. If converter station B has sufficient power and its excess power is enough to balance the power deficit of converter station A, then converter station B will provide full power sharing.

[0115] P B→A =ΔP A (2)

[0116] If converter station B has sufficient power but its excess power is insufficient to balance the power deficit of converter station A, then converter stations B and C will jointly perform power mutual assistance:

[0117] P B→A =P Be (3)

[0118] P C→A =ΔP A -P Be (4)

[0119] In the formula, P Be This indicates the excess power of converter station B.

[0120] If converter station B has sufficient power but no excess power, then determine the power status of converter station C:

[0121] If converter station C has sufficient power and its power deficit is enough to balance the power deficit of converter station A, then converter station C will provide full power exchange.

[0122] P C→A =ΔP A (5)

[0123] If converter station C has sufficient power but no excess power, the power difference will be purchased by converter station A from the power grid.

[0124] Case 2: Two converter stations have power deficits, while the remaining converter stations have sufficient power (taking converter stations A and B as examples, the deficit power is ΔP respectively). A ΔP B ); Determine the power status of converter station C. If converter station C has sufficient power and its excess power is enough to balance the power deficit of converter stations A and B, then converter station C will provide full power exchange.

[0125] P C→A =ΔP A (6)

[0126] P C→B =ΔP B (7)

[0127] If converter station C has sufficient power but the excess power can only balance part of the power deficit between the two converter stations, the closer converter station should be selected for priority power exchange, and the remaining power deficit should be purchased from the grid.

[0128] A power mutual assistance coefficient is set for the mutual assistance power of the three converter stations, representing the actual power mutual assistance level of the converter stations. By optimizing the power mutual assistance coefficient, the optimal mutual assistance power of each converter station under the premise of meeting the constraints is determined, and the optimal power mutual assistance scheme between converter stations in the flexible DC interconnection system of multiple distribution substations and the power grid supplement scheme are obtained. Under the premise of ensuring the reliable operation of the distribution substations, the implementation cost of the flexible DC interconnection scheme is minimized.

[0129] A higher capacity-to-load ratio for flexible DC interconnection converter stations results in a higher system power mutual support level and greater system power supply reliability during load increases. This invention uses the power mutual support level Supp to represent the system's converter station power mutual support capability.

[0130] The power balance level Supp is defined as being calculated from the capacity ratio:

[0131]

[0132] In the formula, λ represents the minimum allowable capacity ratio of the system. x This indicates the final selected capacity ratio.

[0133] In the above specific embodiments, the power mutual assistance method between converter stations in a distribution substation area provided by the present invention determines the power status of a flexible DC interconnection system of multiple distribution substation areas according to a pre-established energy management strategy; when the power status meets preset conditions, power mutual assistance between distribution substations in the target area is initiated; in response to the power mutual assistance between distribution substations, the target distribution substation with power deficit and the deficit power of the target distribution substation are determined; the power status of other distribution substations in the target area is calculated, and a power mutual assistance strategy is determined based on the power status of the other distribution substations and the deficit power of the target distribution substation; wherein, the other distribution substations are the distribution substations in the target area other than the target distribution substation.

[0134] Thus, this invention addresses the capacity limitation problem of converter stations by first formulating an energy management strategy for flexible DC interconnection systems with new energy access, and then proposing an inter-station power mutual assistance strategy based on this energy management strategy. This satisfies the power mutual assistance needs between converter stations in a flexible DC interconnection system with multiple distribution substations, optimizes the degree of power mutual assistance, improves the utilization rate of distribution substation equipment, reduces the pressure of capacity expansion, and enhances the economic efficiency of power distribution system operation.

[0135] According to a second aspect of the present invention, a power mutual assistance device between converter stations in a distribution substation area is provided.

[0136] In some embodiments, such as Figure 6 As shown, the device includes:

[0137] The power status determination unit 601 is used to determine the power status of the flexible DC interconnection system of multiple distribution substations according to a pre-defined energy management strategy.

[0138] Trigger condition response unit 602 is used to initiate power mutual assistance between distribution stations in the target area when the power state meets preset conditions.

[0139] The power deficit determination unit 603 is used to determine the target distribution station with power deficit and the power deficit of the target distribution station in response to the power mutual assistance between the distribution stations.

[0140] The mutual assistance strategy generation unit 604 is used to calculate the power status of other distribution stations in the target area, and determine the power mutual assistance strategy based on the power status of the other distribution stations and the power deficit of the target distribution station; wherein, the other distribution stations are distribution stations in the target area other than the target distribution station.

[0141] In some embodiments, determining the power state of a multi-distribution area flexible DC interconnection system according to a pre-defined energy management strategy specifically includes:

[0142] Calculate the real-time power difference of the flexible DC interconnection system for the multiple distribution stations;

[0143] If the real-time power difference reaches a preset difference threshold, then the real-time power difference is determined to meet the preset condition.

[0144] In some embodiments, the real-time power difference P of the flexible DC interconnection system of the multi-distribution station area is calculated using a first preset formula. imb (t);

[0145] The first preset formula is:

[0146] P pv (t)-P l o ad (t)=P imb (t)

[0147] In the formula, P pv (t) represents the power generation of the photovoltaic system at time t, P load (t) represents the load power demand at the current time t.

[0148] In some embodiments, the preset condition is: the current energy storage state of the target distribution station does not allow charging or discharging, or the energy storage charging and discharging power cannot meet the system power difference.

[0149] In some embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0150] If all other distribution stations are in a state of sufficient power, at least one of the other distribution stations shall be identified as the power supply distribution station.

[0151] In some embodiments, when all other distribution stations are in a state of sufficient power, determining at least one of the other distribution stations as the power supply distribution station specifically includes:

[0152] With all other distribution stations in a state of sufficient power, obtain the distance between each of the other distribution stations and the target distribution station;

[0153] The other distribution stations that are closest to the target distribution station are identified as candidate distribution stations;

[0154] The alternative distribution radio station is used as the power distribution radio station.

[0155] In some embodiments, the other distribution stations with the smallest distance from the target distribution station are determined as candidate distribution stations, and the process further includes:

[0156] Obtain the excess power value of the candidate radio stations;

[0157] If the excess power value is greater than or equal to the deficit power of the target distribution station, then the alternative distribution station is used as the power supply distribution station.

[0158] In some embodiments, the excess power value of the candidate radio stations is obtained, and then the method further includes:

[0159] If the excess power value is less than the deficit power of the target distribution station, then at least one other distribution station is added together with the alternative distribution station as the power supply distribution station.

[0160] In some embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0161] If all other distribution stations are in a state of full power, and the sum of the excess power values ​​of all other distribution stations is less than the shortage power of the target distribution station, then the target distribution station is instructed to purchase power.

[0162] In some embodiments, the power status of other distribution stations within the target area is calculated, and a power reconciliation strategy is determined based on the power status of the other distribution stations and the power deficit of the target distribution station, specifically including:

[0163] When there are at least two target distribution stations, determine the excess power of each of the other distribution stations;

[0164] If the excess power of one of the other distribution stations is greater than or equal to the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a power supply distribution station.

[0165] In some embodiments, when there are at least two target distribution stations, determining the excess power of each of the other distribution stations, and then further comprising:

[0166] If the excess power of one of the other distribution stations is greater than the deficit power of any of the target distribution stations, but less than the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a candidate distribution station.

[0167] In some embodiments, determining the other distribution station as a candidate distribution station further includes:

[0168] If the excess power of the alternative distribution station is greater than the deficit power of any of the target distribution stations, then the alternative distribution station shall be used as the power supply distribution station for the target distribution station.

[0169] In some embodiments, determining the other distribution station as a candidate distribution station further includes:

[0170] If the excess power of the candidate radio station is greater than the deficit power of at least two of the target radio stations, then the distance between the candidate radio station and each of the target radio stations is obtained.

[0171] The alternative distribution station is the power supply distribution station of the target distribution station that is closest to the alternative distribution station.

[0172] In some embodiments, the multi-distribution station area flexible DC interconnection system includes at least three distribution stations.

[0173] According to a second aspect of the present invention, a power mutual assistance device between converter stations in a distribution substation area is provided.

[0174] According to a third aspect of the present invention, a computer device is provided.

[0175] In some embodiments, the computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0176] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0177] The present invention provides a method and apparatus for power mutual assistance between converter stations in a distribution substation area. Based on a pre-defined energy management strategy, the method determines the power status of a flexible DC interconnection system across multiple distribution substation areas. When the power status meets preset conditions, power mutual assistance between distribution substations within a target area is initiated. In response to the power mutual assistance, the method identifies the target distribution substation with a power deficit and its deficit power. The method calculates the power status of other distribution substations within the target area and determines a power mutual assistance strategy based on the power status of the other distribution substations and the deficit power of the target distribution substation. The other distribution substations are those within the target area other than the target distribution substation.

[0178] Thus, this invention addresses the capacity limitation problem of converter stations by first formulating an energy management strategy for flexible DC interconnection systems with new energy access, and then proposing an inter-station power mutual assistance strategy based on this energy management strategy. This satisfies the power mutual assistance needs between converter stations in a flexible DC interconnection system with multiple distribution substations, optimizes the degree of power mutual assistance, improves the utilization rate of distribution substation equipment, reduces the pressure of capacity expansion, and enhances the economic efficiency of power distribution system operation.

[0179] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7 As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores static and dynamic information data. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the above method embodiments.

[0180] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device to which the present invention is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0181] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0182] This invention is not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A method for power mutual assistance between converter stations in a distribution radio area, characterized in that, The method includes: The power status of the flexible DC interconnection system for multiple distribution substations is determined based on a pre-defined energy management strategy. When the power status meets the preset conditions, power mutual assistance between distribution stations within the target area is initiated. In response to the power mutual assistance between the distribution stations, the target distribution station with the power deficit and the power deficit of the target distribution station are determined; Calculate the power status of other distribution stations within the target area, and determine a power reconciliation strategy based on the power status of the other distribution stations and the power deficit of the target distribution station. This includes: if all other distribution stations are in a sufficient power state, determine at least one of the other distribution stations as a power supply distribution station; or, if all other distribution stations are in a sufficient power state, and the sum of the excess power values ​​of all other distribution stations is less than the power deficit of the target distribution station, instruct the target distribution station to purchase power; or, if there are at least two target distribution stations, determine the excess power of each of the other distribution stations; if the excess power of one of the other distribution stations is greater than or equal to the sum of the power deficit of all the target distribution stations, then determine that other distribution station as a power supply distribution station; wherein, the other distribution stations are distribution stations in the target area other than the target distribution station.

2. The power mutual assistance method between converter stations in a distribution substation area according to claim 1, characterized in that, Based on a pre-defined energy management strategy, the power status of the flexible DC interconnection system across multiple distribution substations is determined, specifically including: Calculate the real-time power difference of the flexible DC interconnection system for the multiple distribution stations; If the real-time power difference reaches a preset difference threshold, then the real-time power difference is determined to meet the preset condition.

3. The power mutual assistance method between converter stations in a distribution substation area according to claim 2, characterized in that, The real-time power difference of the flexible DC interconnection system of the multi-distribution station area is calculated using the first preset formula. ; The first preset formula is: In the formula, This represents the power generation of the photovoltaic system at the current time t. This represents the load power demand at the current time t.

4. The power mutual assistance method between converter stations in a distribution substation area according to any one of claims 1-3, characterized in that, The preset condition is that the current energy storage state of the target distribution station does not allow charging or discharging, or the energy storage charging and discharging power cannot meet the system power difference.

5. The power mutual assistance method between converter stations in a distribution substation area according to claim 1, characterized in that, Assuming all other distribution stations are in a state of sufficient power, at least one of the other distribution stations is identified as the power supply distribution station, specifically including: With all other distribution stations in a state of sufficient power, obtain the distance between each of the other distribution stations and the target distribution station; The other distribution stations that are closest to the target distribution station are identified as candidate distribution stations; The alternative distribution radio station is used as the power distribution radio station.

6. The power mutual assistance method between converter stations in a distribution substation area according to claim 5, characterized in that, After determining the other distribution stations with the smallest distance from the target distribution station as candidate distribution stations, the process further includes: Obtain the excess power value of the candidate radio stations; If the excess power value is greater than or equal to the deficit power of the target distribution station, then the alternative distribution station is used as the power supply distribution station.

7. The power mutual assistance method between converter stations in a distribution substation area according to claim 6, characterized in that, The process further includes obtaining the excess power value of the candidate radio stations, and then: If the excess power value is less than the deficit power of the target distribution station, then at least one other distribution station is added together with the alternative distribution station as the power supply distribution station.

8. The power mutual assistance method between converter stations in a distribution substation area according to claim 1, characterized in that, When there are at least two target distribution stations, the excess power of each of the other distribution stations is determined, followed by: If the excess power of one of the other distribution stations is greater than the deficit power of any of the target distribution stations, but less than the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a candidate distribution station.

9. The power mutual assistance method between converter stations in a distribution substation area according to claim 8, characterized in that, After determining the other distribution stations as alternative distribution stations, the process further includes: If the excess power of the alternative distribution station is greater than the deficit power of any of the target distribution stations, then the alternative distribution station shall be used as the power supply distribution station for the target distribution station.

10. The power mutual assistance method between converter stations in a distribution substation area according to claim 8, characterized in that, After determining the other distribution stations as alternative distribution stations, the process further includes: If the excess power of the candidate radio station is greater than the deficit power of at least two of the target radio stations, then the distance between the candidate radio station and each of the target radio stations is obtained. The alternative distribution station is the power supply distribution station of the target distribution station that is closest to the alternative distribution station.

11. The power mutual assistance method between converter stations in a distribution substation area according to any one of claims 1-3 and 5-9, characterized in that, The flexible DC interconnection system with multiple distribution stations includes at least three distribution stations.

12. A power mutual assistance device between converter stations in a distribution area, characterized in that, The device includes: The power state determination unit is used to determine the power state of the flexible DC interconnection system of multiple distribution substations according to a pre-defined energy management strategy. A trigger condition response unit is used to initiate power mutual assistance between distribution stations within the target area when the power state meets preset conditions. A power deficit determination unit is used to determine the target distribution station with a power deficit and the power deficit of the target distribution station in response to the power mutual assistance between the distribution stations. A power mutual assistance strategy generation unit is used to calculate the power status of other distribution stations within the target area, and determine a power mutual assistance strategy based on the power status of the other distribution stations and the power deficit of the target distribution station. This strategy includes: if all other distribution stations are in a sufficient power state, determining at least one of the other distribution stations as a power supply distribution station; or, if all other distribution stations are in a sufficient power state, and the sum of the excess power values ​​of all other distribution stations is less than the power deficit of the target distribution station, instructing the target distribution station to purchase power; or, if there are at least two target distribution stations, determining the excess power of each of the other distribution stations; if the excess power of one of the other distribution stations is greater than or equal to the sum of the power deficit of all the target distribution stations, then determining that other distribution station as a power supply distribution station; wherein, the other distribution stations are distribution stations within the target area other than the target distribution station.

13. The power mutual assistance device between converter stations in a distribution substation area according to claim 12, characterized in that, The power state determination unit determines the power state of the multi-distribution area flexible DC interconnection system according to a pre-defined energy management strategy, specifically including: Calculate the real-time power difference of the flexible DC interconnection system for the multiple distribution stations; If the real-time power difference reaches a preset difference threshold, then the real-time power difference is determined to meet the preset condition.

14. The power mutual assistance device between converter stations in a distribution substation area according to claim 13, characterized in that, The real-time power difference of the flexible DC interconnection system of the multi-distribution station area is calculated using the first preset formula. ; The first preset formula is: In the formula, This represents the power generation of the photovoltaic system at the current time t. This represents the load power demand at the current time t.

15. The power mutual assistance device between converter stations in a distribution substation area according to claim 12, characterized in that, The preset condition is that the current energy storage state of the target distribution station does not allow charging or discharging, or the energy storage charging and discharging power cannot meet the system power difference.

16. The power mutual assistance device between converter stations in a distribution substation area according to claim 12, characterized in that, Assuming all other distribution stations are in a state of sufficient power, at least one of the other distribution stations is identified as the power supply distribution station, specifically including: With all other distribution stations in a state of sufficient power, obtain the distance between each of the other distribution stations and the target distribution station; The other distribution stations that are closest to the target distribution station are identified as candidate distribution stations; The alternative distribution radio station is used as the power distribution radio station.

17. The power mutual assistance device between converter stations in a distribution substation area according to claim 16, characterized in that, After determining the other distribution stations with the smallest distance from the target distribution station as candidate distribution stations, the process further includes: Obtain the excess power value of the candidate radio stations; If the excess power value is greater than or equal to the deficit power of the target distribution station, then the alternative distribution station is used as the power supply distribution station.

18. The power mutual assistance device between converter stations in a distribution substation area according to claim 17, characterized in that, The process further includes obtaining the excess power value of the candidate radio stations, and then: If the excess power value is less than the deficit power of the target distribution station, then at least one other distribution station is added together with the alternative distribution station as the power supply distribution station.

19. The power mutual assistance device between converter stations in a distribution substation area according to claim 12, characterized in that, When there are at least two target distribution stations, the excess power of each of the other distribution stations is determined, followed by: If the excess power of one of the other distribution stations is greater than the deficit power of any of the target distribution stations, but less than the sum of the deficit power of all the target distribution stations, then the other distribution station is determined to be a candidate distribution station.

20. The power mutual assistance device between converter stations in a distribution substation area according to claim 19, characterized in that, After determining the other distribution stations as alternative distribution stations, the process further includes: If the excess power of the alternative distribution station is greater than the deficit power of any of the target distribution stations, then the alternative distribution station shall be used as the power supply distribution station for the target distribution station.

21. The power mutual assistance device between converter stations in a distribution substation area according to claim 19, characterized in that, After determining the other distribution stations as alternative distribution stations, the process further includes: If the excess power of the candidate radio station is greater than the deficit power of at least two of the target radio stations, then the distance between the candidate radio station and each of the target radio stations is obtained. The alternative distribution station is the power supply distribution station of the target distribution station that is closest to the alternative distribution station.

22. The power mutual assistance device between converter stations in a distribution substation area according to any one of claims 12-14 and 16-20, characterized in that, The flexible DC interconnection system with multiple distribution stations includes at least three distribution stations.

23. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 11.

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