Quantitative evaluation method, system, device and medium under main coordination

Abstract

This invention belongs to the field of power system stability assessment technology, specifically involving a quantitative assessment method, system, equipment, and medium under main-distribution network coordination. Addressing the shortcomings of existing quantitative assessment methods for stability mutual assistance requirements under main-distribution network coordination, which suffer from low accuracy, this invention adopts the following technical solution: A quantitative assessment method for stability mutual assistance requirements under main-distribution network coordination, comprising: establishing a main-distribution network interactive joint model considering load demand based on the joint parameters of main-distribution network interconnection nodes and lines; calculating a first quantitative assessment index of main-distribution network stability mutual assistance requirements applied to different scenarios based on the main-distribution network interactive joint model; calculating a voltage-power sensitivity quantitative assessment index reflecting the stability mutual assistance requirements of multi-line and ring main-distribution networks based on the main-distribution network interactive joint model and the first quantitative assessment index; and performing assessment based on the index. The beneficial effects of this invention are: the use of novel assessment indices enables quantitative analysis of single-line, multi-line, and ring main-distribution networks.

Description

Technical Field

[0001] This invention belongs to the field of power system stability assessment technology, specifically involving quantitative assessment methods, systems, equipment, and media under main and distribution coordination. Background Technology

[0002] The coordination between the main and distribution networks is becoming an inevitable trend in the development of new power systems. However, the significant increase in the frequency and intensity of power transmission after coordination means that fluctuations in the output of distributed generation sources and changes in load demand in the distribution network will be transmitted to the main grid through interconnection nodes, affecting the power balance and operational stability of the main grid. Voltage regulation operations in the main grid may also cause voltage exceedances in the distribution network, directly impacting the power quality of the distribution network. Once voltage instability occurs, it will lead to more serious consequences than in independent operation mode. Quantitative assessment of the stability mutual support requirements under main-distribution coordination has become a key issue that must be addressed first in the operation of the main and distribution networks.

[0003] Meanwhile, the coordinated operation of primary and distribution networks also faces the dual challenges of differentiated scenarios and dynamic load demands. The interaction modes and stability requirements of primary and distribution networks vary significantly under different operating scenarios. However, most current assessment schemes for the stability requirements of primary and distribution networks do not consider the mutual stability relationship between the two, and the indicators used lack the ability to dynamically adapt to differentiated scenarios and load demands, resulting in low accuracy of assessment results.

[0004] Therefore, there is an urgent need to propose a quantitative assessment method for stability mutual assistance requirements that takes into account differentiated scenarios and load demands under the main-distribution coordination, so as to provide technical support for ensuring the safety and economy of the main-distribution coordination operation. Summary of the Invention

[0005] This invention addresses the shortcomings of existing methods for quantitatively assessing the stability mutual support requirements under master-distributor coordination, which suffer from low accuracy. It provides a method that considers differentiated scenarios and load demands to accurately assess the stability mutual support requirements of master-distributor coordinated operation under varying scenarios and dynamic load requirements. This invention also provides a system for quantitatively assessing the stability mutual support requirements under master-distributor coordination, a computer device, and a computer-readable storage medium.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a method for quantitatively evaluating the stability mutual assistance requirements under primary and secondary coordination, comprising: S1. Construct the main distribution network architecture and establish a main distribution network interaction joint model that considers load demand based on the main distribution network connection nodes and line joint parameters. S2. The first quantitative evaluation index for the stability mutual assistance requirements of the main distribution network in different scenarios is calculated based on the main distribution network interaction joint model. S3. Based on the main distribution network interaction joint model and the first quantitative evaluation index, calculate the voltage-power sensitivity quantitative evaluation index that reflects the stability mutual assistance requirements of multi-line and ring main distribution networks. The voltage-power sensitivity quantitative evaluation index considers the relationship between load voltage and power sensitivity. S4. Evaluation is conducted based on the first quantitative evaluation index and the voltage-power sensitivity quantitative evaluation index.

[0007] As an improvement, in S1, the main distribution network interaction joint model reflects the power status of each node in the single-line and multi-line main distribution network, as well as the relationship between the voltage of the end node of the main distribution network and the line parameters, and the voltage of the beginning node and the transmission power.

[0008] As an improvement, in S2, the first quantitative evaluation index includes the voltage stability index. Line stability indicators System stability indicators and node voltage indicators L - INDEX .

[0009] As an improvement, in S2, the voltage stability index Represented as:

[0010] In the formula, V For voltage, P , Q These are active power and reactive power, respectively. R , X These are resistance and reactance, respectively. i , j Number the nodes; For containing n For the main and distribution networks of all lines, calculate and select the maximum value among the voltage stability indicators of all lines as the overall indicator of the main and distribution networks.

[0011] As an improvement, in S2, the line stability index Represented as:

[0012] In the formula, A ij For the line ij of A parameter, α ij for A ij phase angle, β ij The line impedance angle. δ ij For nodes i With nodesj voltage phase angle difference, V i , V j They are nodes i , j The voltage.

[0013] As an improvement, in S2, the system stability index... Represented as:

[0014] In the formula, P j For nodes j Received active power, V j For nodes j voltage, For nodes j The sensitivity of voltage to its received active power; Node voltage index L - INDEX Represented as:

[0015] In the formula, V j For nodes j The actual voltage, V oj The equivalent voltage of the node.

[0016] As an improvement, in S3, the voltage-power sensitivity quantification evaluation index is expressed as:

[0017] In the formula, n The number of nodes in the main and distribution networks under study. m For nodes j The number of connected nodes.

[0018] A quantitative assessment system for stability mutual support requirements under master-supplier coordination, employing the aforementioned quantitative assessment method for stability mutual support requirements under master-supplier coordination, includes: The model building module is used to establish a joint interaction model of the main and distribution networks that takes into account load demand, based on the joint parameters of the main and distribution network interconnection nodes and lines. The first quantitative indicator calculation module is used to calculate the first quantitative evaluation indicator for the mutual support of the stability of the main and distribution networks in different scenarios. The voltage-power sensitivity quantitative evaluation index calculation module is used to calculate the voltage-power sensitivity quantitative evaluation index that reflects the stability mutual support requirements of multi-line and ring main distribution networks. The evaluation module is used to perform evaluations based on a first quantitative evaluation index and a voltage-power sensitivity quantitative evaluation index.

[0019] Computer equipment includes a processor and a storage medium, the storage medium storing a computer program, which, when executed by the processor, implements the aforementioned method for quantitatively assessing the stability and mutual support requirements under master-slave coordination.

[0020] A computer-readable storage medium having a computer program stored thereon, which, when executed, implements the aforementioned method for quantitatively assessing the stability and mutual support requirements under master-slave coordination.

[0021] The present invention presents a quantitative assessment method for stability mutual assistance requirements under main-distribution network coordination. Through a hierarchical design of the indicator system and a joint model of main-distribution network interaction, it considers different operating scenarios and load demands under main-distribution network coordination. By quantitatively analyzing the stability mutual assistance requirements of single-line, multi-line, and ring main-distribution networks, it proposes multiple quantitative assessment indicators, addressing multi-dimensional stability assessment needs from simple single-line networks to complex multi-line and ring networks, and from single operating scenarios to differentiated scenarios; the assessment accuracy is higher. The significantly improved stability assessment accuracy and reliability provide more realistic quantitative assessment indicators for mutual assistance requirements in power grid operation, directly guiding the optimization of power grid dispatching strategies, equipment upgrades and renovations, and the formulation of emergency control plans. This can effectively avoid accidents such as voltage collapse and large-scale power outages caused by insufficient main-distribution network coordination, reducing economic losses. Attached Figure Description

[0022] Figure 1 This is a flowchart of the method for quantitatively evaluating the stability mutual assistance requirements under the master-slave coordination of the present invention.

[0023] Figure 2 It is a π-type equivalent circuit model of a single transmission line or distribution line in a main power grid.

[0024] Figure 3 It is a schematic diagram of a portion of the main distribution network (busbar multi-branch model).

[0025] Figure 4 This is a schematic diagram of the main distribution network structure.

[0026] Figure 5 This is a comparison chart of the results of evaluating the margin of a single radial distribution network using the indicators used in this embodiment and traditional indicators.

[0027] Figure 6 This is a comparison chart showing the results of evaluating the stability mutual support requirements of a single-ring distribution network using the method of this embodiment and the traditional approach. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0029] See Figure 1 The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination according to embodiments of the present invention includes: S1. Construct the main distribution network architecture and establish a main distribution network interaction joint model that considers load demand based on the main distribution network connection nodes and line joint parameters. S2. The first quantitative evaluation index for the stability mutual assistance requirements of the main distribution network in different scenarios is calculated based on the main distribution network interaction joint model. S3. Based on the main distribution network interaction joint model and the first quantitative evaluation index, calculate the voltage-power sensitivity quantitative evaluation index that reflects the stability mutual assistance requirements of multi-line and ring main distribution networks. The voltage-power sensitivity quantitative evaluation index considers the relationship between load voltage and power sensitivity. S4. Evaluation is conducted based on the first quantitative evaluation index and the voltage-power sensitivity quantitative evaluation index.

[0030] In this embodiment, constructing the main distribution network architecture includes Figure 2 The circuit model Figure 3 Busbar multi-branch model and Figure 4 The dual-ring network model, together with these three elements, forms a complete chain for "main and distribution network" analysis. The dual-ring network model is a typical high-reliability wiring method for medium-voltage distribution networks.

[0031] In this embodiment, S1 uses a π-type equivalent circuit model of a single-circuit transmission line (or distribution line), the schematic diagram of which is shown below. Figure 2 As shown, it includes the first node and the last node, V i and V j These represent the voltage phasors at the beginning (node ​​i) and end (node ​​j) of the line, respectively. δ is the voltage phase angle, jB / 2 represents the parallel susceptance to ground of the line, B is the total susceptance to ground of the line, and j indicates that it is capacitive. i =P i +jQ i and S j =P j +jQ j These represent the complex power (apparent power) injected at the beginning and end of the line, respectively. P is active power, and Q is reactive power. S i ′ =P i ′ +jQ i ′ and Sj′ =P j′ +jQ j′ These represent the complex power flowing through the series impedance Z of the line (i.e., the power transmitted within the line). Line impedance Z = R +j X， R is the resistance of the circuit, and X is the reactance of the circuit.

[0032] A schematic diagram of a portion of a current main distribution network is shown below. Figure 3 As shown ( Figure 3 If we analyze a single branch, such as branch 1, its electrical characteristics can be used as follows: Figure 2 (Described using a π-type equivalent circuit), the voltage and current at the beginning of the line are expressed in terms of the voltage and current at the end as follows:

[0033]

[0034] In the formula, V s This refers to the voltage phasor at the beginning of the line; I s This refers to the current phasor at the beginning of the line; V R This refers to the voltage phasor at the end of the line. I R For the current phasor at the end of the line; A The voltage transmission coefficient of the transmission matrix represents the ratio of the voltage at the beginning to the voltage at the end when the end is open-circuited. B The impedance parameter of the transmission matrix represents the ratio of the voltage at the beginning to the current at the end when the end is short-circuited. C The admittance parameter of the transfer matrix represents the ratio of the current at the beginning to the voltage at the end when the end is open-circuited. D represents the current transmission coefficient of the transmission matrix.

[0035] It can be represented in matrix form as follows:

[0036] in:

[0037]

[0038]

[0039]

[0040] In the formula, Y For line admittance, Z This represents the line impedance.

[0041] The main distribution network interaction joint model requires accurate representation of the power status of single-line and multi-line main distribution network nodes, and requires the establishment of the correlation between the voltage of the end node of the main distribution network and line parameters, the voltage of the beginning end and the transmission power, so as to support the construction of stability mutual assistance demand assessment indicators based on single-line, multi-line and ring main distribution networks.

[0042] node j The total active power received is expressed as follows:

[0043] In the formula, P ij for Node j From node i The received active power is expressed as follows:

[0044] In the formula, V Si For nodes i Voltage, V Rj For nodes j Voltage, B ij For the line ij of B parameter, θ Bij for B ij phase angle, δ ij For nodes i With nodes j voltage phase angle difference, A ij For the line ij of A parameter, θ Aij for A ij The phase angle.

[0045] The quadratic equation for the terminal node voltage is expressed as follows: .

[0046] In this embodiment, in S2, obtaining the first quantitative evaluation index of the stability mutual assistance requirements of the main distribution network under different scenarios is the basis for the quantitative analysis of the stability requirements of the main distribution network under different scenarios for single-line and two-node networks.

[0047] The first quantitative evaluation indicator includes voltage stability index. Line stability indicators System stability indicators and node voltage indicators L - INDEX .

[0048] Voltage stability index This is used to evaluate the voltage stability of all lines based on the voltage equations of the main distribution network. Its calculation is based on... <0 means that when the main distribution network is stable, the sensitivity of the node voltage to the received active power must be negative.

[0049] Voltage stability index Represented as:

[0050] In the formula, V For voltage, P , Q These are active power and reactive power, respectively. R , X These are resistance and reactance, respectively. i , j Number the nodes.

[0051] This formula shows that for the voltage stability index, the index value for each line is 1 when the main distribution network is stable, 0 when there is no load, and between 0 and 1 when the voltage is unstable, i.e., 0 < 1. D v ij <1. Furthermore, for those containing n For the main and distribution networks of all lines, calculate and select the maximum value among all line voltage stability indicators as the overall indicator of the main and distribution networks.

[0052] In the formula, D 1. D 2、…、 D n Each line D v ij Indicator value.

[0053] Line stability indicators The stability of a line is determined using the equations relating transmitted power and the second-order voltage, expressed as:

[0054] In the formula, A ij For the line ij of A parameter, α ij for A ij phase angle, βij The line impedance angle. δ ij For nodes i With nodes j voltage phase angle difference, V i , V j They are nodes i , j The voltage.

[0055] This formula shows that, for line stability indicators, when the main and distribution networks are stable, the stability of each line is... LVSI All indicator values ​​satisfy 1 < LVSI <2, the value of this indicator is 1 when there is no load, and the value of this indicator is 2 when the voltage is unstable.

[0056] System stability index The ratio of power loss to received power is used to reflect the stability of a system when the power factor of the main distribution network is constant and the power gradually increases. It is expressed as:

[0057] In the formula, P j For nodes j Received active power, V j For nodes j voltage, For nodes j The sensitivity of voltage to the active power it receives.

[0058] This formula shows that, for the system stability index, the value of the index is 0 when there is no load on the main distribution network and 1 when the voltage is unstable.

[0059] L - INDEX Online voltage stability assessment is achieved based on the equivalent voltage of the load nodes in the main and distribution networks. Calculation L - INDEX When determining the indicators, first determine the equivalent voltage of the load node. V oj This equivalent voltage depends on the generator node voltage vector. V G By reasonably dividing the system admittance matrix into blocks (assuming all load currents...) I L This is derived from the fact that the value is zero. When the system is under stress, the nodes... j of L - INDEX index L jThe result is calculated by substituting the node voltages into the corresponding expressions, as follows:

[0060] In the formula, V j For nodes j The actual voltage, V oj The equivalent voltage of the node is denoted by . The stability is reflected by normalizing it to the range of 0 to 1 or close to the boundary value. The closer it is to 0, the more stable it is, and the closer it is to 1, the closer it is to instability.

[0061] In this embodiment, in S3, by calculating the voltage-power sensitivity quantitative evaluation index of the stability mutual assistance requirement of the main distribution network, an accurate quantitative evaluation of the stability mutual assistance requirement under the coordinated operation of multiple lines and ring main distribution networks can be achieved. The single-line evaluation method corresponds to S2. The single-line evaluation takes a single line as an independent unit, ignores the power mutual assistance and voltage support between lines, and is suitable for simple topologies such as single radial topologies. The multi-line and ring main distribution network evaluation methods are an extension, and are the same, corresponding to S3. The multi-line and double-ring network evaluation methods construct a comprehensive voltage-power sensitivity index of the system, taking into account the coupling between nodes and the ring network mutual assistance effect, and are suitable for complex structures such as multi-line and ring networks, and can better reflect the overall stability mutual assistance requirement of the system.

[0062] From the quadratic equation of the receiving-end node voltage, the voltage sensitivity to active power can be expressed as follows:

[0063] In the formula, V Rj For the receiving node j The voltage amplitude; P ij For the line ij Active power injected at the receiving end; B ij For elements of the admittance matrix; V si as the first node i The voltage amplitude; θ Bij Elements of the admittance matrix Bij The phase angle; δ ij This is the phase angle difference between the voltage at the starting end and the voltage at the receiving end; A ij These are the parameters of the transmission matrix; θ APij For transmission matrix parameters A ij Phase angle related to power factor.

[0064] When the main and distribution networks are stable, the voltage sensitivity corresponding to the active power received by a node is negative, as shown below:

[0065] Its reciprocal is expressed as follows:

[0066] When the main and distribution networks are stable, the following inequality is satisfied:

[0067] The stability and mutual assistance demand assessment indicators are expressed as follows:

[0068] In the formula, n The number of nodes in the main and distribution networks under study. m For nodes j The number of connected nodes.

[0069] When there is no load, due to I R =0, therefore:

[0070]

[0071] Therefore, the evaluation index values ​​correspond to the stable state of the main distribution network.

[0072] At maximum load, The denominator must be zero, therefore:

[0073] Therefore, a stability mutual assistance demand assessment index value of 1 corresponds to an unstable state of the main distribution network.

[0074] This embodiment of the quantitative assessment method for stability mutual assistance requirements under main-distribution coordination considers different operating scenarios and load demands under main-distribution coordination. Through quantitative analysis of the stability mutual assistance requirements of single-line, multi-line, and ring main-distribution networks, it establishes a main-distribution network interaction joint model that considers load demand, proposes quantitative assessment indicators, and achieves accurate assessment of the stability mutual assistance requirements of the power system under main-distribution coordination. It solves the multi-dimensional stability assessment requirements from simple single-line networks to complex multi-line and ring networks, and from single operating scenarios to differentiated scenarios. It provides more realistic quantitative assessment indicators for mutual assistance requirements of power grid operation, and the assessment indicators have high stability assessment accuracy and reliability. They can directly guide the optimization of power grid dispatching strategies, equipment upgrades and transformations, and the formulation of emergency control plans, effectively avoiding accidents such as voltage collapse and large-scale power outages caused by insufficient main-distribution coordination, and reducing economic losses. At the same time, it is highly consistent with the development trend of new power systems, helps to ensure the safe and stable operation of the power system under scenarios of maximizing infrastructure utilization and high proportion of new energy access, provides key technical guarantees for power grid security and economy, and promotes the improvement of operating efficiency and safety levels in the power industry.

[0075] A representative actual main and distribution network structure is selected for case analysis. For example... Figure 4 As shown, one distribution network feeder is a single-radial distribution network (two-node single-line equivalent model), used to verify the performance of the indicators in S2 under a simple scenario; the other distribution network feeder is in a single-ring distribution network (three-node ring network extended model), used to verify the advantages of the indicators in S3 in multi-line, ring structures. The parameters of this main distribution network are all based on actual engineering data. The feeder electrical distance is relatively long, and the end load is heavy. The load growth pattern simulates the process of the system gradually approaching voltage collapse from a light load. The comparison results in the simple scenario (single-radial network) are as follows... Figure 5 As shown in Table 1. The margin metric used in traditional quantization applications refers to the additional power increment that can be tolerated from the current state to the voltage collapse point, expressed as: P Margin = P collapse - P current。

[0076] Table 1. Comparison of S2 index and margin index in traditional quantitative applications during load growth in a single radial distribution network.

[0077] From Table 1 and Figure 5 It can be seen that as the active power of the end load continues to increase, the traditional continuous power flow margin... P Margin The voltage stability index gradually decreases from 1 pu to 0, showing a monotonically decreasing trend; while the voltage stability index used in this embodiment... Dv The value monotonically increases from 0.023 to 1.000, showing a monotonically increasing trend. The opposite trends of the two indicators are due to their different physical meanings. Traditional margin represents the remaining active power increment before the voltage collapse point; therefore, the heavier the load, the smaller the remaining margin, gradually approaching 0. In contrast, the voltage stability state indicator used in this embodiment... D v It directly quantifies the voltage stability at the current operating point, and utilizes the definition. The condition is <0. The closer the index value is to 1, the closer it is to instability. Therefore, it increases with the increase of load.

[0078] In terms of computational efficiency, the traditional continuous power flow method requires starting from the current operating point, gradually increasing the load, and performing multiple power flow iterations until the voltage collapse point is found. This process involves a large amount of computation, and each load change requires a new solution, making it difficult to apply to online real-time monitoring of distribution networks. In contrast, the voltage stability index in this embodiment... D v Only the terminal voltage, active power, reactive power, and line parameters of the current operating section need to be collected. The quantitative index between 0 and 1 can be obtained by simple formula calculation without any iteration or prediction. The calculation efficiency is greatly improved, which meets the time response requirements of online monitoring of distribution network.

[0079] Regarding the linear change of stability quantification indicators, traditional margins exhibit significant nonlinear characteristics. At light loads, the indicator is 1.15 pu, a relatively large value, but the system is actually very stable at this point. However, when the indicator is in the range of 1.1 pu to 1.2 pu, the load approaches the collapse point, and the margin drops sharply to 0.20 and 0.00, resulting in delayed warnings. In contrast, the voltage stability indicator in this embodiment... D v The S2 index shows a linear, monotonically increasing trend from the light load stage. When the load reaches 1.0 pu, the S2 index has risen to 0.709, indicating that the index is very sensitive to changes and can capture small changes in stability caused by increased load, issuing early warning signals instead of waiting until it is close to collapse before changing drastically.

[0080] In terms of physical intuitiveness, traditional margin is a dimensional power difference, the magnitude of which depends on the system's baseline capacity and the current operating point, making direct comparison between systems of different sizes difficult; while the voltage stability index in this embodiment... D v It is a dimensionless normalized value of 0 to 1, where 0 indicates infinite voltage stability margin and 1 indicates voltage collapse. The intermediate value directly corresponds to the percentage of stability and has the same physical meaning in systems of any size. The result is more intuitive and facilitates quick assessment of risk level.

[0081] For a single-ring distribution network, the traditional approach is to calculate the independent voltage stability index of each line separately and then take the maximum value as the overall system evaluation value. However, this embodiment uses a comprehensive index based on the voltage-power sensitivity relationship. INDEX A comprehensive evaluation was conducted. The results of comparing the performance indicators of this embodiment with traditional methods under different load levels in a single-ring distribution network are as follows: Figure 6 As shown in Table 2.

[0082] Table 2 Comparison of S3 index and maximum value index of traditional quantitative application under different load levels in single-ring distribution network

[0083] From Table 2 and Figure 6 It is evident that the evaluation value obtained by the traditional weakest path method... D v.max The overall performance was significantly lower than the combined performance in S3 of this embodiment across all load levels. Continuous power flow verification confirmed that the actual system failure occurred... λ When the load growth factor is approximately 1.52 (predicted / simulated load = baseline load × load growth factor), the theoretical instability index should be 1.0, but traditional methods only reflect it up to 0.853, severely underestimating the system's instability risk; while in S3... INDEX The index value is 0.965, which is still lower than 1.0, but it is closer to the true risk level, and the relative error has decreased.

[0084] The difference between the method in this embodiment and the traditional weakest line method is that in a single-ring network, there are power mutual assistance channels between different main and distribution network nodes. When the load on one node increases, causing a voltage drop, another node can provide partial support through the ring network, thereby delaying the overall collapse. The traditional weakest line method only calculates the terminal voltage and power relationship of each line in isolation, completely ignoring the ring network coupling effect, thus resulting in an underestimation of the evaluation index. In contrast, the method in this embodiment... INDEX By constructing a system voltage-power sensitivity matrix, the index explicitly considers the mutual assistance between nodes, and can more realistically reflect the stability mutual assistance requirements of the ring main distribution network.

[0085] Furthermore, in this embodiment INDEX The indicators also have the advantage of quantifying the power balance needs of different load nodes, and can clearly identify the load node with the weakest voltage stability through indicator comparison. In contrast, the traditional weakest line method can only indicate the stable state of the line and cannot directly locate the load node that needs adjustment, thus having limited guiding significance for formulating balance strategies.

[0086] This invention also discloses a quantitative assessment system for stability mutual assistance requirements under master-slave coordination, employing the aforementioned quantitative assessment method for stability mutual assistance requirements under master-slave coordination. The quantitative assessment system for stability mutual assistance requirements under master-slave coordination includes: The model building module is used to establish a joint interaction model of the main and distribution networks that takes into account load demand, based on the joint parameters of the main and distribution network interconnection nodes and lines. The first quantitative indicator calculation module is used to calculate the first quantitative evaluation indicator for the mutual support of the stability of the main and distribution networks in different scenarios. The voltage-power sensitivity quantitative evaluation index calculation module is used to calculate the voltage-power sensitivity quantitative evaluation index that reflects the stability mutual support requirements of multi-line and ring main distribution networks. The evaluation module is used to perform evaluations based on a first quantitative evaluation index and a voltage-power sensitivity quantitative evaluation index.

[0087] This invention also discloses a computer device, including a processor and a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by the processor, it implements the aforementioned method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination.

[0088] This invention also discloses a computer-readable storage medium storing a computer program thereon, which, when executed, implements the aforementioned method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination.

[0089] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A method for quantitatively evaluating the stability and mutual support requirements under master-slave coordination, characterized by: include: S1. Construct the main distribution network architecture and establish a main distribution network interaction joint model that considers load demand based on the main distribution network connection nodes and line joint parameters. S2. The first quantitative evaluation index for the stability mutual assistance requirements of the main distribution network in different scenarios is calculated based on the main distribution network interaction joint model. S3. Based on the main distribution network interaction joint model and the first quantitative evaluation index, calculate the voltage-power sensitivity quantitative evaluation index that reflects the stability mutual assistance requirements of multi-line and ring main distribution networks. The voltage-power sensitivity quantitative evaluation index considers the relationship between load voltage and power sensitivity. S4. Evaluation is conducted based on the first quantitative evaluation index and the voltage-power sensitivity quantitative evaluation index.

2. The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination as described in claim 1, characterized in that: In S1, the main distribution network interaction joint model reflects the power status of each node in the single-line and multi-line main distribution network, as well as the relationship between the voltage of the end node of the main distribution network and the line parameters, and the voltage of the beginning node and the transmission power.

3. The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination as described in claim 2, characterized in that: In S2, the first quantitative evaluation index includes the voltage stability index. Line stability indicators System stability indicators and node voltage indicators L - INDEX .

4. The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination as described in claim 3, characterized in that: In S2, the voltage stability index Represented as: In the formula, V For voltage, P , Q These are active power and reactive power, respectively. R , X These are resistance and reactance, respectively. i , j Number the nodes; For containing n For the main and distribution networks of all lines, calculate and select the maximum value among the voltage stability indicators of all lines as the overall indicator of the main and distribution networks.

5. The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination according to claim 3, characterized in that: In S2, the line stability index Represented as: In the formula, A ij For the line ij of A parameter, α ij for A ij phase angle, β ij The line impedance angle. δ ij For nodes i With nodes j voltage phase angle difference, V i , V j They are nodes i , j The voltage.

6. The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination according to claim 3, characterized in that: In S2, the system stability index Represented as: In the formula, P j For nodes j Received active power, V j For nodes j voltage, For nodes j The sensitivity of voltage to its received active power; Node voltage index L - INDEX Represented as: In the formula, V j For nodes j The actual voltage, V oj The equivalent voltage of the node.

7. The method for quantitatively evaluating the stability mutual assistance requirements under master-slave coordination according to claim 3, characterized in that: In S3, the voltage-power sensitivity quantitative evaluation index is expressed as: In the formula, n The number of nodes in the main and distribution networks under study. m For nodes j The number of connected nodes.

8. A quantitative evaluation system for stability mutual assistance requirements under master-slave coordination, characterized in that: The method for quantitatively assessing the stability mutual assistance demand under primary-secondary coordination as described in any one of claims 1 to 7, wherein the system for quantitatively assessing the stability mutual assistance demand under primary-secondary coordination comprises: The model building module is used to establish a joint interaction model of the main and distribution networks that takes into account load demand, based on the joint parameters of the main and distribution network interconnection nodes and lines. The first quantitative indicator calculation module is used to calculate the first quantitative evaluation indicator for the mutual support of the stability of the main and distribution networks in different scenarios. The voltage-power sensitivity quantitative evaluation index calculation module is used to calculate the voltage-power sensitivity quantitative evaluation index that reflects the stability mutual support requirements of multi-line and ring main distribution networks. The evaluation module is used to perform evaluations based on a first quantitative evaluation index and a voltage-power sensitivity quantitative evaluation index.

9. A computer device, comprising a processor and a storage medium, wherein the storage medium stores a computer program, characterized in that: When the computer program is executed by the processor, it implements the method for quantitatively evaluating the stability mutual assistance requirements under the master-slave coordination as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: It stores a computer program, which, when executed, implements the method for quantitatively evaluating the stability mutual assistance requirements under the master-slave coordination as described in any one of claims 1 to 7.

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