Direct current fed receiving end power grid reactive power distribution method, electronic device and medium

Abstract

The application discloses a DC-fed receiving-end power grid reactive power distribution method, electronic equipment and a medium, and the method comprises the following steps: obtaining the electrical distance between the substation node in the DC preset range and the DC; sorting the multiple substation nodes in the order from small to large according to the electrical distance, and constructing a reactive power configuration node set to be evaluated for reactive power configuration; calculating and obtaining a reactive power optimization distribution vector based on the reactive power configuration node set; and performing reactive power optimization distribution based on the reactive power gap value under the DC feeding fault and the reactive power optimization distribution vector. The application can ensure that each node can quickly adjust the reactive power output according to the requirements of the optimization distribution vector, fill the reactive power gap, improve the reactive power balance capability and voltage stability of the system under the DC feeding fault, and guarantee the safe and stable operation of the power system by combining the reactive power configuration node set and the reactive power optimization distribution vector to formulate a specific reactive power optimization distribution scheme.

Description

Technical Field

[0001] This invention belongs to the field of reactive power optimization technology in power systems, specifically relating to reactive power distribution methods, electronic equipment, and media for DC-fed receiving-end power grids. Background Technology

[0002] In a power system, the receiving-end grid refers to the grid that receives electrical energy input from energy bases. Active power deficit refers to a DC fault in the receiving-end grid when the power generation capacity of the power system is insufficient to meet load demand. For reactive power balance in the DC near-field region, when a blocking fault or commutation failure occurs in the receiving-end grid's DC line, it also leads to a sharp increase in reactive power demand, affecting the stable operation of the system.

[0003] With the increasing variety of reactive power equipment available in power systems, the cost and regulation effects of different types of reactive power equipment must be considered when configuring them. For example, synchronous condensers, as a replacement for traditional generating units, can quickly respond to voltage dips and provide large-capacity dynamic reactive power support. Some power electronic devices can flexibly adjust reactive power output, but their capacity is limited, or they can quickly compensate for reactive power gaps and suppress voltage fluctuations during AC faults. In addition, energy storage power stations have both active and reactive power rapid regulation capabilities. The reactive power support they provide can respond quickly during faults, while active power injection can alleviate power deficits and reduce recovery time after commutation failures. The distributed configuration characteristics of energy storage also make it suitable for multi-point deployment in multi-feed systems.

[0004] In related technologies, traditional reactive power optimization methods are mostly static optimizations, which are difficult to adapt to dynamic changes in the power grid. In multi-infeed DC systems, with the increase in the types of reactive power equipment available, it is necessary to consider the cost-effectiveness of dynamic reactive power configuration in order to improve the effectiveness and efficiency of optimization results. Summary of the Invention

[0005] The purpose of this invention is to optimize the selection of types and capacities of reactive power devices in the DC near-field region, so as to enable reactive power devices to respond quickly and meet reactive power requirements.

[0006] To achieve the above objectives, this invention proposes a reactive power allocation method for a DC-fed receiving-end power grid, comprising: obtaining the electrical distance between a substation node within a preset range of the DC power supply and the DC power supply, wherein the substation node is the substation with the highest AC voltage level within the preset range; sorting multiple substation nodes in ascending order of the electrical distance to construct a reactive power configuration node set to be evaluated; calculating and obtaining a reactive power optimization allocation vector based on the reactive power configuration node set; and performing reactive power optimization allocation based on the reactive power deficit value under DC-fed fault and the reactive power optimization allocation vector.

[0007] In one optional implementation, reactive power optimization allocation is performed based on the reactive power deficit value under DC-DC infeed fault and the reactive power optimization allocation vector. Specifically, this includes: obtaining the length of the reactive power optimization allocation vector based on the reactive power optimization allocation vector; obtaining the reactive power equipment capacity based on the length of the reactive power optimization allocation vector, wherein the reactive power equipment capacity includes dynamic reactive power equipment capacity, static reactive power equipment capacity, and / or total reactive power equipment capacity, wherein the total reactive power equipment capacity is the sum of the dynamic reactive power equipment capacity and the static reactive power equipment capacity; obtaining the reactive power deficit value under DC-DC infeed fault; and activating dynamic reactive power equipment, static reactive power equipment, or stopping reactive power allocation based on the reactive power deficit value and the reactive power equipment capacity.

[0008] In one optional implementation, obtaining the reactive power equipment capacity based on the reactive power optimization allocation vector length specifically includes: sorting multiple substation nodes from smallest to largest based on the reactive power optimization allocation vector length to obtain a sorted set of reactive power optimization allocation vector lengths; and calculating the reactive power equipment capacity based on the set of reactive power optimization allocation vector lengths.

[0009] In one optional implementation, the process of activating dynamic reactive power equipment, static reactive power equipment, or stopping reactive power allocation based on the reactive power deficit value and the reactive power equipment capacity specifically includes: calculating the reactive power compensation redundancy ratio based on the reactive power deficit value and the reactive power equipment capacity, using the following formula: If the length of the reactive power optimization allocation vector satisfies 0 < reactive power optimization allocation vector length ≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed according to the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector lengths from smallest to largest; if the reactive power optimization allocation vector length satisfies <Reactive power optimization allocation vector length≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment are sequentially put into the reactive power optimization allocation vector length set in ascending order of reactive power optimization allocation vector length.

[0010] In one optional implementation, if the length of the reactive power optimization allocation vector satisfies 0 < reactive power optimization allocation vector length ≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed according to the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector lengths from smallest to largest. Specifically, this includes: if the reactive power optimization allocation vector length satisfies... ,in, The number of nodes is [number], and the length of the reactive power optimization allocation vector is ranked [number]. If the first to the second node, ... The sum of the dynamic reactive power equipment capacity of each substation node satisfy If the reactive power distribution stops, then the reactive power allocation will cease; otherwise, it will continue to be allocated sequentially. One to the first Dynamic reactive power equipment at each substation node; if it meets the following requirements: If the reactive power allocation fails, then stop reactive power allocation; otherwise, allocate the static reactive power capacity of the nodes sequentially according to the order of the reactive power optimization allocation vector length in the set from smallest to largest; for nodes with reactive power optimization allocation vector length ranked in the [number]th position... For a given number of nodes, if the first to the second... The sum of the static reactive power capacity of each substation node ,in, If satisfied If reactive power is not allocated, then stop reactive power allocation; otherwise, continue to allocate reactive power. To the Dynamic reactive power equipment at each node; if it satisfies Then, reactive power allocation will cease; among which, For the first The reactive power baseline value of each node, with a redundancy threshold of 0.05, is defined as the value of the node ranked [number]. Dynamic reactive power capacity of individual nodes and static var capacity .

[0011] In an optional implementation, if the length of the reactive power optimization allocation vector satisfies <Reactive power optimization allocation vector length≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed according to the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector lengths from smallest to largest. Specifically, this includes: if the reactive power optimization allocation vector length satisfies... ,in, Given the number of nodes, the length of the reactive power optimization allocation vector is ranked in the order of the number of nodes. For the nth node, if the nth node... One to the first The sum of the dynamic reactive power equipment capacity of each substation node satisfy If the reactive power distribution stops, then the reactive power allocation will cease; otherwise, it will continue to be allocated sequentially. One to the first Dynamic reactive power equipment at each substation node; if it meets the following requirements: If the reactive power allocation fails, then stop reactive power allocation; otherwise, allocate the static reactive power capacity of the nodes sequentially according to the order of the reactive power optimization allocation vector length in the set from smallest to largest; for nodes with reactive power optimization allocation vector length ranked in the [number]th position... For the nth node, if the nth node... One to the first The sum of the static reactive power capacity of each substation node ,in, If satisfied If reactive power is not allocated, then stop reactive power allocation; otherwise, continue to allocate reactive power. To the The static reactive power equipment of each node; if it satisfies If reactive power distribution stops, then reactive power distribution ceases; conversely, in DC... The station's internal capacity is reactive power devices, satisfy; ; For the first The reactive power baseline value of each node.

[0012] In one optional implementation, obtaining the length of the reactive power optimization allocation vector based on the reactive power optimization allocation vector specifically includes: defining the first... The reactive power optimization allocation vector for each node is: ; Obtain the first node from the set of reactive power configuration nodes The short-circuit capacity of the node; based on the short-circuit capacity and the first node... The length of the reactive power optimization allocation vector is calculated based on the electrical distance corresponding to each node, using the following formula: In the formula, To optimize the allocation of reactive power vector length, For the first The electrical distance corresponding to each node For the first The short-circuit capacity of each node.

[0013] In an optional implementation, the reactive power distribution method for the DC-fed receiving-end power grid further includes:

[0014] The electrical distance or short-circuit capacity is normalized and calculated using the following formula:

[0015] In the formula, For the first Each node or value, for Minimum electrical distance or short-circuit capacity of each node. for The maximum electrical distance or short-circuit capacity of each node. For the first After normalizing the nodes or value.

[0016] In one optional implementation, obtaining the electrical distance between the substation node and the DC power line within a preset range specifically includes: obtaining the equivalent reactance from the DC power line to the receiving-end substation node; and calculating the electrical distance based on the equivalent reactance, using the following formula: In the formula, , For equivalent reactance, for The modulus, For the first The first DC-to-receiving-end power grid Electrical distance between substation nodes.

[0017] The present invention also provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform any of the DC-feed receiving-end grid reactive power distribution methods described in the present invention.

[0018] The present invention also provides a computer storage medium storing a computer program, which, when executed by a processor, implements any of the DC-feeding receiving-end power grid reactive power distribution methods described in the present invention.

[0019] The beneficial effects of this invention are as follows: By combining the reactive power configuration node set and the reactive power optimization allocation vector to formulate a specific reactive power optimization allocation scheme, this invention can ensure that under fault conditions, each node can quickly adjust the reactive power output according to the requirements of the optimization allocation vector to fill the reactive power gap, thereby improving the reactive power balance capability and voltage stability of the system under DC feed-in faults and ensuring the safe and stable operation of the power system. Attached Figure Description

[0020] Figure 1 A flowchart of a DC-fed receiving-end power grid reactive power distribution method provided for the implementation of this invention;

[0021] Figure 2 This is a block diagram of an electronic device provided in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 110, processor; 120, memory. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In related technologies, simulations demonstrate that the advantages of adding a synchronous condenser lie in its inertia support and short-term overload capacity, making it suitable for handling transient reactive power demands. Power electronic devices, such as SVC / STATCOM, offer fast response times (milliseconds) and flexible adjustment of reactive power output, but their capacity is limited. SVC / STATCOM can quickly compensate for reactive power gaps and suppress voltage fluctuations during AC faults. Furthermore, the distributed configuration of energy storage in energy storage power stations is suitable for multi-point deployment in multi-feed systems.

[0025] Furthermore, regarding the selection of reactive power compensation nodes, if the receiving-end power grid lacks sufficient dynamic reactive power support, the converter station's ability to absorb a large amount of reactive power from the AC system during a fault will be limited due to the long electrical distance, thus exacerbating voltage instability. Simultaneously, the smaller the short-circuit capacity of a node, the weaker the system's disturbance rejection capability and the worse its voltage stability, requiring the configuration of more reactive power compensation devices.

[0026] like Figure 1 As shown, according to an embodiment of the present invention, in one aspect, a reactive power distribution method for a DC-fed receiving-end power grid is provided, comprising the following steps:

[0027] Step S101: Obtain the electrical distance between the substation node and the DC power source within the preset range of DC power. The substation node is the substation with the highest AC voltage level within the preset range.

[0028] Step S103: Sort the multiple substation nodes in ascending order of electrical distance to construct a set of reactive power configuration nodes to be evaluated.

[0029] Step S105: Calculate and obtain the reactive power optimization allocation vector based on the reactive power configuration node set.

[0030] Step S107: Perform reactive power optimization allocation based on the reactive power deficit value and reactive power optimization allocation vector under DC feed-in fault.

[0031] In this embodiment, the preset range of DC includes AC substations near the DC converter station, AC grid nodes directly connected to DC transmission lines, and AC grid areas that are electrically strongly coupled to the DC system. Within this preset range, substations in the AC grid can be located using a power grid geographic information system or a power grid wiring diagram, and the substation with the highest AC voltage level can be identified and marked as a substation node. The electrical distance can be calculated using the power grid topology and line parameters, reflecting the tightness of the electrical connection between the substation node and the DC system. The smaller the electrical distance, the greater the impact of the substation on the DC system.

[0032] Based on the electrical distances calculated in step S101, all substation nodes are sorted in ascending order. Substation nodes with smaller electrical distances are given priority because they have a more significant impact on the DC system in reactive power configuration.

[0033] From the sorted substation nodes, a certain number of nodes are selected as the set of nodes to be evaluated for reactive power allocation. These nodes will be the focus of subsequent reactive power optimization allocation. The number of nodes selected can be determined based on actual needs and system scale, and typically includes several nodes with the smallest electrical distance.

[0034] Reactive power demand analysis is performed on each node in the set of reactive power configuration nodes to be evaluated. The reactive power demand of each node is considered under normal operation and fault conditions, including load demand, equipment losses, and other factors. Based on the reactive power demand analysis results, the reactive power allocation value for each node is calculated. These allocation values ​​constitute a reactive power optimization allocation vector, indicating the reactive power that should be allocated to each node under different operating conditions to achieve system reactive power balance and voltage stability.

[0035] For feed-in faults in this DC transmission system, such as DC blocking or power surges, a reactive power gap emerges at the moment of the fault and in the subsequent process. The reactive power gap is the difference between the actual reactive power demand in the power system and the reactive power that existing reactive power sources can provide. The size and distribution of the reactive power gap can be determined through simulation or actual monitoring data. The existence of the reactive power gap leads to a drop in system voltage, affecting power quality and system stability. By analyzing the reactive power gap value, it is possible to determine which nodes require reactive power compensation and the magnitude of the compensation, thus providing input data for calculating the optimal reactive power allocation vector.

[0036] Based on the reactive power optimization allocation vector calculated in step S105, and combined with the reactive power deficit value under DC-DC infeed faults, a specific reactive power optimization allocation scheme is formulated. This scheme should ensure that, under fault conditions, each node can quickly adjust its reactive power output according to the requirements of the optimization allocation vector to fill the reactive power deficit, thereby improving the system's reactive power balance capability and voltage stability under DC-DC infeed faults and ensuring the safe and stable operation of the power system.

[0037] Furthermore, based on step S101: obtaining the electrical distance between the substation node and the DC power line within the preset DC range, the specific steps include the following:

[0038] Step S1011: Obtain the equivalent reactance of the DC to the receiving end substation node;

[0039] Step S1013: Based on the equivalent reactance, the electrical distance is calculated using the following formula:

[0040] In the formula, , For equivalent reactance, for The modulus, For the first The first DC-to-receiving-end power grid Electrical distance between substation nodes.

[0041] Electrical distance is an abstract concept used to describe the "distance" between two grid nodes. This distance is not a physical distance, but rather a distance calculated based on reactance values, reflecting the strength of the electrical connection between the two nodes. Equivalent reactance is the sum of the inductive and capacitive responses in an AC circuit. It can be obtained in several different ways. For example, it can be obtained using electrical calculation software. The equivalent parameters of an AC circuit can be measured using the three-meter method. This method calculates the equivalent resistance and equivalent reactance of the load under test by measuring the voltage, current, and power consumed by the load, thereby determining the equivalent impedance parameters of the load under test. Other methods will not be elaborated upon.

[0042] Further, step S107, based on the reactive power deficit value and reactive power optimization allocation vector under DC feed-in fault, performs reactive power optimization allocation, specifically including the following steps:

[0043] Step S1071: Obtain the length of the reactive power optimization allocation vector based on the reactive power optimization allocation vector.

[0044] Step S1073: Obtain the reactive power equipment capacity based on the reactive power optimization allocation vector length. The reactive power equipment capacity includes dynamic reactive power equipment capacity, static reactive power equipment capacity and / or total reactive power equipment capacity. The total reactive power equipment capacity is the sum of the dynamic reactive power equipment capacity and the static reactive power equipment capacity.

[0045] Step S1075: Obtain the reactive power deficit value under DC feed-in fault.

[0046] Step S1077: Based on the reactive power deficit value and reactive power equipment capacity, activate dynamic reactive power equipment, static reactive power equipment, or stop reactive power allocation.

[0047] In this embodiment, the reactive power optimization allocation vector is a vector containing the reactive power allocation values ​​of each node, used to guide the operating status of reactive power equipment. The length of the reactive power optimization allocation vector is the number of reactive power allocation values ​​contained in the vector.

[0048] Reactive power capacity includes dynamic reactive power capacity, static reactive power capacity, and total reactive power capacity. Dynamic reactive power capacity refers to the capacity of equipment that can quickly adjust reactive power. Static reactive power capacity refers to the capacity of equipment that adjusts reactive power by switching capacitors or reactor banks. Total reactive power capacity is the sum of dynamic reactive power capacity and static reactive power capacity.

[0049] Step 1077: Based on the reactive power deficit value and the reactive power equipment capacity, activate dynamic reactive power equipment, static reactive power equipment, or stop reactive power allocation.

[0050] If the reactive power deficit is large, dynamic reactive power equipment should be prioritized because it can quickly respond to changes in reactive power demand.

[0051] If the capacity of dynamic reactive power equipment is insufficient to meet the reactive power deficit, then consider investing in static reactive power equipment.

[0052] If the reactive power deficit is small or the reactive power equipment capacity is sufficient, the investment in reactive power equipment can be appropriately reduced to avoid overcompensation.

[0053] By following the above steps, based on the reactive power deficit value and reactive power optimization allocation vector under DC feed-in faults, dynamic and static reactive power equipment can be rationally deployed to achieve optimized allocation of reactive power and improve the voltage stability and operating efficiency of the power system.

[0054] This invention starts from the characteristics of DC feed-in faults and the key factors of reactive power demand caused by them. By calculating and analyzing the electrical distance between each node in the system and the DC to be analyzed, as well as the short-circuit capacity of the nodes, it constructs a set of reactive power configuration nodes to be evaluated and a node reactive power optimization allocation vector. Then, it uses the node reactive power optimization allocation vector to optimize the configuration process of multiple types of reactive power devices at the nodes. This can optimize the selection of the types and capacities of reactive power devices in the DC near-field area, so that the reactive power devices can play a role in rapid response and meeting reactive power demand.

[0055] Further, step S1071, obtaining the length of the reactive power optimization allocation vector based on the reactive power optimization allocation vector, specifically includes the following steps:

[0056] Step S10711: Define the first The reactive power optimization allocation vector for each node is: .

[0057] Step S10713: Obtain the first node in the reactive power configuration node set. The short-circuit capacity of each node.

[0058] Step S10715: Based on short-circuit capacity and the first The length of the reactive power optimization allocation vector is calculated based on the electrical distances corresponding to each node, using the following formula:

[0059] ;

[0060] In the formula, To optimize the allocation of reactive power vector length, For the first The electrical distance corresponding to each node For the first The short-circuit capacity of each node.

[0061] Short-circuit capacity refers to the maximum current a system can withstand during a short-circuit fault. This formula combines the effects of electrical distance and short-circuit capacity to form an indicator reflecting the importance of a node in reactive power distribution. By calculating this length, we can better understand and optimize the distribution of reactive power in the system.

[0062] By following the steps above, reactive power allocation can be optimized, thereby improving system stability and efficiency. By accurately calculating the reactive power allocation vector length for each node, reactive power devices can be allocated more rationally, reducing system losses and improving power quality.

[0063] Furthermore, the reactive power distribution method for DC-fed receiving-end power grids also includes the following steps:

[0064] Step S109: Normalize the electrical distance or short-circuit capacity using the following formula:

[0065] .

[0066] In the formula, For the first Each node or value, for Minimum electrical distance or short-circuit capacity of each node. for The maximum electrical distance or short-circuit capacity of each node. For the first After normalizing the nodes or value.

[0067] Normalization helps eliminate the influence of different dimensions and orders of magnitude, making the data comparable, and thus...

[0068] Further analysis and processing will be conducted. Define the first node in the set of reactive power configuration nodes to be evaluated. The electrical distance between substations at each node is Short-circuit capacity is ,in, Obtained using electrical calculation software.

[0069] Normalized value The value ranges from 0 to 1, where 0 indicates that the electrical characteristic of this node is the weakest among all nodes (i.e., the minimum value), and 1 indicates the strongest (i.e., the maximum value). In this way, all nodes can be compared on the same scale.

[0070] The electrical distances or short-circuit capacities involved in subsequent calculations can all be normalized data.

[0071] Furthermore, step S1073, obtaining the reactive power equipment capacity based on the reactive power optimization allocation vector length, specifically includes the following steps:

[0072] Step S10731: Based on the reactive power optimization allocation vector length, sort multiple substation nodes from smallest to largest to obtain the sorted set of reactive power optimization allocation vector lengths.

[0073] Step S10731: Calculate the reactive power equipment capacity based on the reactive power optimization allocation vector length set.

[0074] The sorted set of reactive power optimization allocation vector lengths is arranged in ascending order of electrical distance. By sorting the nodes of each substation, a set of nodes with reactive power configuration to be evaluated is obtained. .in After sorting by electrical distance, in Among the nodes, the electrical distance ranks [number]. Named nodes.

[0075] Through the above steps, the reactive power optimization allocation vector lengths of the sorted substation nodes are arranged sequentially to form an ordered set. Based on the sorted set of reactive power optimization allocation vector lengths, combined with the reactive power demand and equipment characteristics of each node, the dynamic reactive power equipment capacity and static reactive power equipment capacity are calculated, and the dynamic reactive power equipment capacity is reasonably obtained.

[0076] From the embodiments of the present invention, the DC power in a certain power system partition is obtained using electrical calculation software according to the content of step S101. The equivalent reactance of the substations at the 12 highest AC voltage levels (500 kV) within the zone is the corresponding electrical distance from DC to each substation node. These 12 500 kV substation nodes are then reordered according to their electrical distance values ​​from largest to smallest; the node ranked first among the 12 nodes has the highest electrical distance.

[0077] Furthermore, step S1077, based on the reactive power deficit value and reactive power equipment capacity, involves activating dynamic reactive power equipment, static reactive power equipment, or stopping reactive power allocation, specifically including the following steps:

[0078] Step S10771: Calculate the reactive power compensation redundancy ratio based on the reactive power deficit value and the reactive power equipment capacity. The calculation formula is as follows: .

[0079] Step S10773: If the length of the reactive power optimization allocation vector satisfies 0 < length of reactive power optimization allocation vector ≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is put into operation in the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector length from smallest to largest.

[0080] Step S10775: If the length of the reactive power optimization allocation vector satisfies <Reactive power optimization allocation vector length≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is put into operation in the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector length from smallest to largest.

[0081] In this embodiment, the redundancy ratio of reactive power compensation is calculated based on the reactive power deficit value and the capacity of reactive power equipment. This ensures that the system has sufficient redundancy to cope with possible load changes or equipment failures during reactive power allocation. Dynamic or static reactive power equipment is deployed sequentially at nodes according to the ascending order of the reactive power optimization allocation vector length set. This allows for optimal resource utilization while meeting the system's reactive power requirements.

[0082] These steps ensure that when allocating reactive power, the system can both meet current reactive power demands and maintain a certain level of redundancy to cope with potential changes or failures. At the same time, optimizing resource utilization can improve system operating efficiency and stability.

[0083] The definition is ranked first Dynamic reactive power capacity of individual nodes and static var capacity . and This can be obtained through the node device ledger information. (Definition of the first...) reactive power capacity to be allocated to each node for Then it accumulates to the th The total reactive power capacity of each node is ,satisfy ,in, .

[0084] From the embodiments of the present invention, according to step S105, the reactive power optimization allocation vector of the 12 nodes in this partition is calculated. The reactive power optimization allocation vector of each node is composed of two parameters: electrical distance and short-circuit capacity. Considering that both parameters are normalized, the 12 substation nodes are reordered according to the calculated reactive power optimization allocation vector length from smallest to largest, resulting in a set of reactive power optimization allocation vector lengths. Taking the original top three nodes in the set of nodes to be evaluated for reactive power configuration (1, 2, 3) as an example: the reactive power optimization allocation vector length of node 1 is 0.054, ranking 4th among the 12 nodes. Therefore, in the set of reactive power optimization allocation vector lengths, the original node 1 ranks 4th, and the corresponding reactive power optimization allocation vector length is... The node number is changed to node 4. The reactive power optimization allocation vector length of node 2 is 0.063, ranking 8th among the reactive power optimization allocation vector lengths of the 12 nodes. Therefore, in the set of reactive power optimization allocation vector lengths, the original node 2 would be ranked 8th, with a corresponding reactive power optimization allocation vector length of... The node number is changed to node 8. The reactive power optimization allocation vector length of node 3 is 0.031, ranking first among the reactive power optimization allocation vector lengths of the 12 nodes. Therefore, in the set of reactive power optimization allocation vector lengths, the original node 3 ranks first, and the corresponding reactive power optimization allocation vector length is... The node number is changed to node 1.

[0085] Furthermore, taking node 8 in the reactive power optimization allocation vector length set as an example, the dynamic reactive power capacity of this node... 60Mvar and static var equipment capacity 600Mvar The total reactive power capacity is 660 Mvar. The total reactive power capacity added to the 8th node is 3300 Mvar.

[0086] Furthermore, based on step S10773, if the length of the reactive power optimization allocation vector satisfies 0 < length of reactive power optimization allocation vector ≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed according to the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector lengths from smallest to largest. The specific steps include the following:

[0087] Step S107731: If the length of the reactive power optimization allocation vector satisfies ,in, The number of nodes, and the length of the reactive power optimization allocation vector, are ranked in the order of [number of nodes]. If the first to the second node, ... The sum of the dynamic reactive power equipment capacity of each substation node satisfy If the reactive power distribution stops, then the reactive power allocation will cease; otherwise, it will continue to be allocated sequentially. One to the first Dynamic reactive power equipment at each substation node;

[0088] Step S107733: If satisfied If the reactive power allocation is not specified, then stop the reactive power allocation; otherwise, allocate the static reactive power equipment capacity of the nodes in ascending order of the length of the reactive power optimization allocation vector in the set.

[0089] The length of the reactive power optimization allocation vector is ranked in the order of [number]. For a given number of nodes, if the first to the second... The sum of the static reactive power capacity of each substation node ,in, ;

[0090] Step S107735: If satisfied If reactive power is not allocated, then stop reactive power allocation; otherwise, continue to allocate reactive power. To the Dynamic reactive power equipment at each node;

[0091] Step S107737: If satisfied Then, reactive power distribution will cease.

[0092] in, For the first The reactive power baseline value of each node, with a redundancy threshold of 0.05, is defined as the value of the node ranked [number]. Dynamic reactive power capacity of individual nodes and static var capacity .

[0093] Furthermore, based on step S107735, if the reactive power optimization allocation vector length satisfies... <Reactive power optimization allocation vector length≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed according to the order of the reactive power optimization allocation vector length in the set of reactive power optimization allocation vector lengths from smallest to largest. The specific steps include the following:

[0094] Step S1077351: If the length of the reactive power optimization allocation vector satisfies ,in, Given the number of nodes, the length of the reactive power optimization allocation vector is ranked in the order of the number of nodes. For the nth node, if the nth node... One to the first The sum of the dynamic reactive power equipment capacity of each substation node satisfy If the reactive power distribution stops, then the reactive power allocation will cease; otherwise, it will continue to be allocated sequentially. One to the first Dynamic reactive power equipment at each substation node;

[0095] Step S1077353: If satisfied If the reactive power allocation is not specified, then stop the reactive power allocation; otherwise, allocate the static reactive power equipment capacity of the nodes in ascending order of the length of the reactive power optimization allocation vector in the set.

[0096] The length of the reactive power optimization allocation vector is ranked in the order of [number]. For the nth node, if the nth node... One to the first The sum of the static reactive power capacity of each substation node ,in, ;

[0097] Step S1077355: If satisfied If reactive power is not allocated, then stop reactive power allocation; otherwise, continue to allocate reactive power. To the Static reactive power equipment at each node;

[0098] Step S1077357: If satisfied If reactive power distribution stops, then reactive power distribution ceases; conversely, in DC... The station's internal capacity is reactive power devices, satisfy; ; For the first The reactive power baseline value of each node.

[0099] From the embodiments of the present invention, according to the content of step S107, DC is first obtained using electrical calculation software. The reactive power deficit is 2100 Mvar. After judging the set of reactive power optimization allocation vector lengths, it meets the following requirements. The node corresponding to the length is the first four nodes in the set of reactive power optimization allocation vector lengths. When the dynamic reactive power equipment capacity is sequentially allocated to the fourth substation node, the cumulative sum of the dynamic reactive power equipment capacities of the first to fourth substation nodes is... The value is 240 Mvar. However, this is still not sufficient. Therefore, the static var equipment capacity is then sequentially added, including the static var equipment capacity added to the third substation node, and the sum of the static var equipment capacities from the first to the third substation node. The value is 1800 Mvar. The condition is met. Then, reactive power distribution will cease.

[0100] This invention constructs a set of reactive power configuration nodes to be evaluated and a node reactive power optimization allocation vector, and optimizes the configuration process of multiple types of reactive power devices at the nodes. This can optimize the selection of the types and capacity of reactive power devices in the DC near-field, so that the reactive power devices can play a role in rapid response and meeting reactive power demand.

[0101] In another aspect, the present invention also provides an electronic device, comprising: at least one processor 110; and a memory 120 communicatively connected to the at least one processor; wherein the memory 120 stores instructions executable by the at least one processor 110, the instructions being executed by the at least one processor 110 to enable the at least one processor 110 to perform any of the DC-feed receiving-end grid reactive power distribution methods.

[0102] On the other hand, the present invention also proposes a computer storage medium storing a computer program, which, when executed by a processor, implements a method for reactive power distribution of the receiving-end power grid with DC feed in any one of the parameters.

[0103] 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 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 above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Dual Data SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), Rambus Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM). The various embodiments described in this specification are presented in a progressive manner, and similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, for embodiments of apparatus, devices, and non-volatile computer storage media, since they are substantially similar to the method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments.

[0104] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for reactive power distribution in a DC-fed receiving-end power grid, characterized in that, include: Obtain the electrical distance between a substation node within a preset range of DC and the DC line, wherein the substation node is the substation with the highest AC voltage level within the preset range; The substation nodes are sorted in ascending order of electrical distance to construct a set of reactive power configuration nodes to be evaluated. The reactive power allocation vector is calculated and obtained based on the set of reactive power configuration nodes. Reactive power optimization allocation is performed based on the reactive power deficit value under DC feed-in fault and the aforementioned reactive power optimization allocation vector, specifically including: The length of the reactive power optimization allocation vector is obtained based on the aforementioned reactive power optimization allocation vector. The reactive power equipment capacity is obtained based on the length of the reactive power optimization allocation vector. The reactive power equipment capacity includes dynamic reactive power equipment capacity, static reactive power equipment capacity and / or total reactive power equipment capacity. The total reactive power equipment capacity is the sum of the dynamic reactive power equipment capacity and the static reactive power equipment capacity. Obtain the reactive power deficit value under DC feed-in fault conditions; Based on the aforementioned reactive power deficit value and the reactive power equipment capacity, dynamic reactive power equipment, static reactive power equipment, or reactive power allocation can be activated or deactivated, specifically including: The reactive power compensation redundancy ratio is calculated based on the reactive power deficit value and the reactive power equipment capacity, using the following formula: ； If the length of the reactive power optimization allocation vector satisfies 0 < reactive power optimization allocation vector length ≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment are sequentially put into the reactive power optimization allocation vector length set in ascending order of reactive power optimization allocation vector length. If the length of the reactive power optimization allocation vector satisfies <Reactive power optimization allocation vector length≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment are sequentially put into the reactive power optimization allocation vector length set in ascending order of reactive power optimization allocation vector length.

2. The reactive power distribution method for a DC-fed receiving-end power grid according to claim 1, characterized in that, Obtaining the reactive power equipment capacity based on the length of the reactive power optimization allocation vector specifically includes: Based on the reactive power optimization allocation vector length, the multiple substation nodes are sorted from smallest to largest to obtain the sorted set of reactive power optimization allocation vector lengths. The reactive power equipment capacity is calculated based on the set of reactive power optimization allocation vector lengths.

3. The reactive power distribution method for a DC-fed receiving-end power grid according to claim 1, characterized in that, If the length of the reactive power optimization allocation vector satisfies 0 < reactive power optimization allocation vector length ≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed in ascending order of the reactive power optimization allocation vector length set, specifically including: If the length of the reactive power optimization allocation vector satisfies ,in, The number of nodes is [number], and the length of the reactive power optimization allocation vector is ranked [number]. If the first to the second node, ... The sum of the dynamic reactive power equipment capacity of each substation node satisfy If the reactive power distribution stops, then the reactive power allocation will cease; otherwise, it will continue to be allocated sequentially. One to the first Dynamic reactive power equipment at each substation node; If satisfied If the reactive power allocation is not specified, then stop the reactive power allocation; otherwise, allocate the static reactive power equipment capacity of the nodes in ascending order of the length of the reactive power optimization allocation vector in the set. The length of the reactive power optimization allocation vector is ranked in the order of [number]. For a given number of nodes, if the first to the second... The sum of the static reactive power capacity of each substation node ,in, ; If satisfied If reactive power is not allocated, then stop reactive power allocation; otherwise, continue to allocate reactive power. To the Dynamic reactive power equipment at each node; If satisfied Then, reactive power distribution will cease. in, For the first The reactive power baseline value of each node, with a redundancy threshold of 0.05, is defined as the value of the node ranked [number]. Dynamic reactive power capacity of individual nodes and static var capacity .

4. The reactive power distribution method for a DC-fed receiving-end power grid according to claim 1, characterized in that, If the length of the reactive power optimization allocation vector satisfies <Reactive power optimization allocation vector length≤ If the reactive power compensation redundancy ratio is less than or equal to the redundancy threshold, then reactive power allocation is stopped; otherwise, the node dynamic reactive power equipment or node static reactive power equipment is sequentially deployed in ascending order of the reactive power optimization allocation vector length set, specifically including: If the length of the reactive power optimization allocation vector satisfies ,in, Given the number of nodes, the length of the reactive power optimization allocation vector is ranked in the order of the number of nodes. For the nth node, if the nth node... One to the first The sum of the dynamic reactive power equipment capacity of each substation node satisfy If the reactive power distribution stops, then the reactive power allocation will cease; otherwise, it will continue to be allocated sequentially. One to the first Dynamic reactive power equipment at each substation node; If satisfied If the reactive power allocation is not specified, then stop the reactive power allocation; otherwise, allocate the static reactive power equipment capacity of the nodes in ascending order of the length of the reactive power optimization allocation vector in the set. The length of the reactive power optimization allocation vector is ranked in the order of [number]. For the nth node, if the nth node... One to the first The sum of the static reactive power capacity of each substation node ,in, If satisfied If reactive power is not allocated, then stop reactive power allocation; otherwise, continue to allocate reactive power. To the Static reactive power equipment at each node; If satisfied If reactive power distribution stops, then reactive power distribution ceases; conversely, in DC... The station's internal capacity is reactive power devices, satisfy ; For the first The reactive power baseline value of each node.

5. The reactive power distribution method for a DC-fed receiving-end power grid according to any one of claims 1 to 4, characterized in that, Obtaining the length of the reactive power optimization allocation vector based on the aforementioned reactive power optimization allocation vector specifically includes: Definition of the first The reactive power optimization allocation vector for each node is: ; Obtain the first node from the set of reactive power configuration nodes. Short-circuit capacity of each node; Based on the short-circuit capacity and the first The length of the reactive power optimization allocation vector is calculated based on the electrical distance corresponding to each node, using the following formula: ； In the formula, To optimize the allocation of reactive power vector length, For the first The electrical distance corresponding to each node For the first The short-circuit capacity of each node.

6. The reactive power distribution method for a DC-fed receiving-end power grid according to claim 5, characterized in that, Also includes: The electrical distance or short-circuit capacity is normalized and calculated using the following formula: In the formula, For the first Each node or value, for Minimum electrical distance or short-circuit capacity of each node. for The maximum electrical distance or short-circuit capacity of each node. For the first After normalizing the nodes or value.

7. The reactive power distribution method for a DC-fed receiving-end power grid according to any one of claims 1 to 4, characterized in that, Obtaining the electrical distance between a substation node within a preset DC range and the DC line specifically includes: Obtain the equivalent reactance from DC to the receiving end of the power grid substation node; Based on the equivalent reactance, the electrical distance is calculated using the following formula: In the formula, , For equivalent reactance, for The modulus, For the first The first DC-to-receiving-end power grid Electrical distance between substation nodes.

8. An electronic device, characterized in that, include: At least one processor; A memory that is communicatively connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the DC-feed receiving-end grid reactive power distribution method according to any one of claims 1 to 6.

9. A computer storage medium, characterized in that, The system contains a computer program that, when executed by a processor, implements a reactive power distribution method for a DC-feed receiving-end power grid as described in any one of claims 1 to 6.

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