Power evaluation method and device, storage medium and electronic equipment

Abstract

The invention relates to a power evaluation method and device, a storage medium and electronic equipment, and the method comprises the steps: obtaining the initial node parameter information of a plurality of power supplies at a plurality of nodes in a power grid when the power grid operates in a steady state, and carrying out the calculation of the initial node parameter information for a specified node according to the initial node parameter information; and determining target power supply power output by a target power supply of the specified node, determining index evaluation values corresponding to a plurality of evaluation indexes for evaluating the target power supply power according to the target power supply power, and weighting the plurality of index evaluation values to determine a target evaluation value corresponding to the target power supply power.

Description

Technical Field

[0001] The present disclosure relates to the field of electric power technology, and in particular to a power evaluation method, device, storage medium and electronic equipment. Background Art

[0002] In recent years, with the increasing access capacity of new energy sources in the power grid, the operation of the distribution network has become more complicated. The detection and evaluation of the power control capability and voltage control capability of new energy generators represented by wind turbines during the operation of the power grid has become one of the hot topics in current research.

[0003] At present, the controllability of voltage and power is usually evaluated by analyzing observable physical quantities in the power network. However, this evaluation method lacks the ability to evaluate the individual effects of each power source, and the evaluation has limitations and lacks accuracy. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a power evaluation method, device, storage medium and electronic device.

[0005] According to a first aspect of an embodiment of the present disclosure, a power evaluation method is provided, the method comprising: obtaining initial node parameter information of multiple power supplies at multiple nodes in a power grid when the power grid is operating in a steady state; for a specified node, determining a target power supply power output by a target power supply at the specified node based on the initial node parameter information; determining, based on the target power supply power, indicator evaluation values ​​corresponding to multiple evaluation indicators for evaluating the target power supply power; and weighting the multiple indicator evaluation values ​​to determine a target evaluation value corresponding to the target power supply power.

[0006] Optionally, the initial node parameter information includes node voltages and load powers of multiple nodes; determining the target power supply power output by the target power supply at the designated node based on the initial node parameter information includes: determining the load power based on the node voltage; determining the target power supply power based on the node voltage and the load power.

[0007] Optionally, the target power supply power includes reactive power; the evaluation index includes a voltage-reactive ratio index, the index evaluation value includes a voltage-reactive ratio evaluation value, and the voltage-reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power supply in the specified node on the node voltage of the specified node; the index evaluation values ​​corresponding to the multiple evaluation indexes used to evaluate the target power supply power are determined according to the target power supply power, including: determining the target node voltage corresponding to the target power supply in the specified node according to the node voltage; and determining the ratio of the target node voltage to the reactive power as the voltage-reactive ratio evaluation value.

[0008] Optionally, the evaluation index includes a complex power efficiency index, and the index evaluation value includes a complex power efficiency evaluation value, and the complex power efficiency evaluation value is used to characterize the efficiency of the designated node in receiving the power output by the target power supply; determining the index evaluation values ​​corresponding to multiple evaluation indicators used to evaluate the target power supply power according to the target power supply power includes: obtaining the total output power output by the target power supply to the designated node; and determining the ratio of the target power supply power to the total output power as the complex power efficiency evaluation value.

[0009] Optionally, the target power supply power includes active power and apparent power; the evaluation index includes a power factor index, the index evaluation value includes a power factor evaluation value, and the power factor evaluation value is used to characterize the degree of active power in the target power supply power; determining the index evaluation values ​​corresponding to multiple evaluation indicators used to evaluate the target power supply power based on the target power supply power includes: determining the ratio of the active power to the apparent power as the power factor evaluation value.

[0010] Optionally, weighting the multiple indicator evaluation values ​​to determine the target evaluation value corresponding to the target power supply power includes: standardizing the multiple indicator evaluation values ​​to obtain multiple standardized indicator evaluation values; based on a subjective weighting method, obtaining subjective weighting coefficients corresponding to the multiple indicator evaluation values; based on an objective weighting method, obtaining objective weighting coefficients corresponding to the multiple indicator evaluation values; and determining the target evaluation value according to the standardized indicator evaluation values, the subjective weighting coefficients and the objective weighting coefficients.

[0011] According to a second aspect of an embodiment of the present disclosure, there is provided a power evaluation device, comprising: An acquisition module is used to acquire initial node parameter information of multiple power sources at multiple nodes in the power grid when the power grid is in steady-state operation; A first determination module is used to determine, for a designated node, a target power supply power output by a target power supply of the designated node according to the initial node parameter information; A second determining module, configured to determine, according to the target power supply power, an indicator evaluation value corresponding to a plurality of evaluation indicators for evaluating the target power supply power; The third determination module is used to weight the multiple indicator evaluation values ​​to determine a target evaluation value corresponding to the target power supply power.

[0012] Optionally, the initial node parameter information includes node voltages and load powers of multiple nodes; the first determination module is further used to determine the load power based on the node voltage, and to determine the target power supply power based on the node voltage and the load power.

[0013] Optionally, the target power source power includes reactive power; the evaluation index includes a voltage-reactive ratio index, and the index evaluation value includes a voltage-reactive ratio evaluation value, and the voltage-reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power source in the specified node on the node voltage of the specified node; the second determination module is used to determine the target node voltage corresponding to the target power source in the specified node based on the node voltage, and determine the ratio of the target node voltage to the reactive power as the voltage-reactive ratio evaluation value.

[0014] Optionally, the evaluation index includes a complex power efficiency index, and the index evaluation value includes a complex power efficiency evaluation value, and the complex power efficiency evaluation value is used to characterize the efficiency of the designated node in receiving the power output by the target power supply; the second determination module is used to obtain the total output power output by the target power supply to the designated node, and determine the ratio of the target power supply power to the total output power as the complex power efficiency evaluation value.

[0015] Optionally, the target power supply power includes active power and apparent power; the evaluation index includes a power factor index, the index evaluation value includes a power factor evaluation value, and the power factor evaluation value is used to characterize the degree of active power in the target power supply power; the second determination module is used to determine the ratio of the active power to the apparent power as the power factor evaluation value.

[0016] Optionally, the third determination module is used to standardize the multiple indicator evaluation values ​​to obtain multiple standardized indicator evaluation values, and based on the subjective weighting method, obtain the subjective weighting coefficients corresponding to the multiple indicator evaluation values, and based on the objective weighting method, obtain the objective weighting coefficients corresponding to the multiple indicator evaluation values, and determine the target evaluation value according to the standardized indicator evaluation value, the subjective weighting coefficient and the objective weighting coefficient.

[0017] According to a third aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the power evaluation method provided in the first aspect of the present disclosure are implemented.

[0018] According to a fourth aspect of an embodiment of the present disclosure, an electronic device is provided, comprising: a memory on which a computer program is stored; and a processor for executing the computer program in the memory to implement the steps of the power evaluation method provided in the first aspect of the present disclosure.

[0019] Through the above technical solution, the target power output of the target power supply for the specified node can be determined by obtaining and according to the initial node parameter information of multiple power supplies at multiple power grid nodes when the power grid is in steady state operation, and the index evaluation values ​​corresponding to multiple evaluation indicators are determined according to the target power supply power, and the multiple index evaluation values ​​are weighted to determine the target evaluation value corresponding to the target power supply power. In this way, the role of a single power supply can be separated from the entire power grid for the node, and the line flow results of multiple power supplies acting together can be decomposed into the results of a single power supply acting alone. The ability of a single power supply to act alone can be evaluated, which can solve the problem of limitations in existing evaluation methods. At the same time, the use of multiple evaluation indicators and evaluation through weighting can improve the accuracy of the evaluation.

[0020] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 The figure is a flow chart of a power evaluation method according to an exemplary embodiment.

[0022] Figure 2 It is a schematic diagram of performing projection processing on the target node voltage in step S131.

[0023] Figure 3 The figure is a flow chart showing another power evaluation method according to an exemplary embodiment.

[0024] Figure 4 The figure is a block diagram of a power evaluation device according to an exemplary embodiment.

[0025] Figure 5 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0027] The terms "first", "second", etc. in the disclosed specification and claims and the above drawings are used to distinguish similar objects and do not have to be understood as a specific order or sequence. In addition, in the description with reference to the drawings, the same symbols in different drawings represent the same elements.

[0028] In the description of the present disclosure, unless otherwise specified, "multiple" means two or more than two, and other quantifiers are similar thereto; "at least one item", "one item or multiple items" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one item a can represent any number of a; for another example, one item or multiple items among a, b and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple; "and / or" is a kind of description of the association relationship of associated objects, indicating that there can be three kinds of relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " indicates that the associated objects before and after are in an "or" relationship.

[0029] In the related technologies, in recent years, with the continuous increase in the access capacity of new energy sources in the power grid, the operation of the distribution network has become more complicated. The detection and evaluation of the power control ability and voltage control ability of new energy generators represented by wind turbines during the operation of the power grid has become one of the hot topics of current research. At present, the control ability of voltage and power is usually evaluated by analyzing the observable physical quantities in the power network. However, this evaluation method lacks the ability to evaluate the individual effects of each power source, and the accuracy of the evaluation is insufficient.

[0030] Therefore, in order to overcome the problems existing in the related art, the present disclosure provides a power evaluation method, device, storage medium and electronic device, which can determine the target power supply power output by the target power supply for the specified node by obtaining and according to the initial node parameter information of multiple power supplies at multiple power grid nodes when the power grid is in steady state operation, and determine the index evaluation values ​​corresponding to multiple evaluation indicators according to the target power supply power, and weight the multiple index evaluation values ​​to determine the target evaluation value corresponding to the target power supply power. In this way, the role of a single power supply can be separated from the entire power grid for the node, and the line flow results of multiple power supplies acting together can be decomposed into the results of a single power supply acting alone, so that the ability of a single power supply to act alone can be evaluated, which can solve the problem of limitations of existing evaluation methods. At the same time, the accuracy of the evaluation can be improved by using multiple evaluation indicators and evaluating through weighting.

[0031] The present disclosure is described below in conjunction with specific embodiments.

[0032] Figure 1 is a flow chart of a power evaluation method according to an exemplary embodiment. Figure 1 As shown, the power evaluation method may include the following steps: In step S11, initial node parameter information of multiple power sources at multiple nodes in the power grid is obtained when the power grid is in steady-state operation.

[0033] The initial node parameter information may include node voltages of multiple nodes. For example, when the power grid is in steady-state operation, the power grid can be equivalent to a circuit network, the power source in the power grid can be equivalent to a current source, and the node load can be equivalent to an impedance. The number of nodes in the power grid can be set to n, where nodes 1 to q are current sources, and the node voltage equation is constructed as follows:

[0034] in, is the node voltage of the i-th node, the value range of i is i=1,2,…,n, is the element at position (i, j) in the inverse matrix of the node admittance matrix, The value of is used to represent the complex impedance from the i-th node to the j-th node, is the current emitted by the mth equivalent current source, and the value range of m is m=1,2,…,q. The node voltage of the i-th node can be expressed as follows through the above node voltage equation:

[0035] in, is the node voltage of the ith node, is the complex impedance from the ith node to the jth node, is the current emitted by the jth equivalent current source.

[0036] In step S12, for the designated node, the target power output by the target power supply of the designated node is determined according to the initial node parameter information.

[0037] In some embodiments, the initial node parameter information includes load powers of multiple nodes, and the load powers can be determined based on the node voltages, and the target power source power can be determined based on the node voltages and the load powers.

[0038] For example, the node voltage of the i-th node It can be obtained that the load power of the i-th node can be expressed as:

[0039] in, is the load power of the ith node, is the node voltage of the ith node, is the conjugate of the i-th node current, is the conjugate of the load admittance of the ith node, is the complex impedance from the ith node to the jth node, is the current emitted by the jth equivalent current source, is the conjugate of the impedance from the i-th node to the k-th node, is the conjugate of the output current of current source k.

[0040] The target power output by the current source k at the i-th node can be obtained from the above formula, which is expressed as:

[0041] in, is the target power output by the current source k at the i-th node, is the node voltage of the ith node, is the conjugate of the load admittance of the ith node, is the conjugate of the impedance from the i-th node to the k-th node, is the conjugate of the output current of current source k.

[0042] In step S13, according to the target power supply power, indicator evaluation values ​​corresponding to a plurality of evaluation indicators for evaluating the target power supply power are determined.

[0043] Among them, the evaluation index may include a voltage-reactive ratio index, a complex power efficiency index and a power factor index, and the index evaluation value may include a voltage-reactive ratio evaluation value, a complex power efficiency evaluation value and a power factor evaluation value. The voltage-reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power supply in the specified node on the voltage of the specified node, the complex power efficiency evaluation value is used to characterize the efficiency of the specified node in receiving the power output by the target power supply, and the power factor evaluation value is used to characterize the effect of the active power in the power of the target power supply.

[0044] In step S14, the multiple indicator evaluation values ​​are weighted to determine a target evaluation value corresponding to the target power supply power.

[0045] Among them, weights can be calculated for the voltage-to-reactive ratio evaluation value, the complex power efficiency evaluation value, and the power factor evaluation value, respectively, to improve the comprehensiveness and accuracy of the evaluation result.

[0046] By adopting the above scheme, the target power output of the target power source for the specified node can be determined by obtaining and according to the initial node parameter information of multiple power sources at multiple power grid nodes when the power grid is in steady state operation, and the index evaluation values ​​corresponding to multiple evaluation indicators are determined according to the target power source power, and the multiple index evaluation values ​​are weighted to determine the target evaluation value corresponding to the target power source power. In this way, the role of a single power source can be separated from the entire power grid for the node, and the line flow results of multiple power sources acting together can be decomposed into the results of a single power source acting alone. The ability of a single power source to act alone can be evaluated, which can solve the problem of limitations of existing evaluation methods. At the same time, the use of multiple evaluation indicators and evaluation through weighting can improve the accuracy of the evaluation.

[0047] In some embodiments, the target power source power in the above step S13 may include reactive power, active power and apparent power, and the above step S13 may include: S131. Determine a target node voltage corresponding to the target power source in the designated node according to the node voltage, and determine a ratio of the target node voltage to the reactive power as the voltage-reactive ratio evaluation value.

[0048] The reactive power may be the imaginary part of the target power source power, for example represents the target power output by the current source k at the i-th node, where , The imaginary part is the reactive power.

[0049] For example, the node voltage of the i-th node is known to be , the node voltage is the target node voltage corresponding to the jth power supply, expressed as Since the target node voltage is a phasor with an angle, when calculating the ratio of the target node voltage to the reactive power, the target node voltage can be projected, such as Figure 2 shown.

[0050] Reference Figure 2 , is the node voltage of load j, is the target node voltage corresponding to power supply i, Indicates the target node voltage The target node voltage can be projected in the direction of the node voltage, and the obtained projection value can be compared with the corresponding reactive power to obtain the voltage-reactive ratio evaluation value, which can be expressed by the following formula:

[0051] in, is the voltage reactive ratio evaluation value, Indicates the target node voltage The model, is the target node voltage corresponding to power supply i, is the node voltage of load j, is the reactive power output by source i at load j. The larger the value of , the greater the effect of the reactive power output by the target power source i on the voltage of the specified node j.

[0052] S132: Obtain the total output power of the target power source to the designated node, and determine the ratio of the target power source power to the total output power as the complex power efficiency evaluation value.

[0053] For example, you can use represents the total output power of target power source i to the specified node j, represents the target power output of the target power source i at the specified node j. Referring to the projection method of step S131, the total output power is projected to the power source power of the target power source i. direction, and at the same time project the target power to the power The complex power efficiency evaluation value is calculated by the following formula:

[0054] in, is the complex power efficiency evaluation value of target battery i at node j, is the total output power of the target power source i to the specified node j, is the target power of target power source i at node j, is the power of target power source i, The larger the value of , the higher the efficiency of the designated node in receiving the power output by the target power supply.

[0055] S133. Determine the ratio of the active power to the apparent power as the power factor evaluation value.

[0056] The active power may be the real part of the target power supply power, for example represents the target power output of target power source i at the jth node, where The real part of is the active power.

[0057] For example, the apparent power can be calculated by the following formula:

[0058] in, is the apparent power, representing the modulus of the target power supply power, is the active power, is the reactive power. The power factor evaluation value can be calculated by the following formula:

[0059] in, is the power factor evaluation value of target battery i at node j, is the active power, is the apparent power. The larger the value is, the greater the contribution of active power to the target power supply.

[0060] In some embodiments, the above step S14 may include: S141. Standardize the multiple indicator evaluation values ​​to obtain multiple standardized indicator evaluation values.

[0061] Among them, the voltage reactive ratio evaluation value And complex power efficiency evaluation value Reactive power is proportional to the power factor rating Reactive Power Inversely proportional, so first the power factor evaluation value The numerical value of is positive, for example, The reciprocal of ,Right now .

[0062] The indicator evaluation value can be Through the zero mean normalization method, the value differences between different eigenvalues ​​are eliminated to obtain the standardized index evaluation value .

[0063] It should be noted that the specific implementation steps of the zero-mean normalization method can refer to the relevant description of the zero-mean normalization method in the relevant technology, which will not be repeated here.

[0064] S142. Based on the subjective weighting method, obtain the subjective weighting coefficients corresponding to the multiple indicator evaluation values.

[0065] Among them, the subjective weighting method may include a priority diagram method, which can obtain the importance evaluation of the voltage-reactive ratio evaluation value, the complex power efficiency evaluation value and the power factor evaluation value by multiple technical experts in the field or big data analysis scoring models, establish a priority diagram based on the importance evaluation value, and calculate the importance of each indicator evaluation value through the priority diagram to obtain the first subjective weighting coefficient corresponding to the voltage-reactive ratio evaluation value , the second subjective weighting coefficient corresponding to the complex power efficiency evaluation value And the third subjective weighting coefficient corresponding to the power factor evaluation value .

[0066] It should be noted that the specific implementation steps of the priority diagram method can refer to the relevant description of the priority diagram method in the relevant technology, which will not be repeated here.

[0067] S143. Based on the objective weighting method, obtain the objective weighting coefficients corresponding to the multiple indicator evaluation values.

[0068] Among them, the objective weighting method may include an entropy weight method, and the first objective weighting coefficient corresponding to the voltage-reactive ratio evaluation value may be obtained based on the entropy weight method. , the second objective weighting coefficient corresponding to the complex power efficiency evaluation value And the third objective weighting coefficient corresponding to the power factor evaluation value .

[0069] It should be noted that the specific implementation steps of the entropy weight method can refer to the relevant description of the entropy weight method in the relevant technology, which will not be repeated here.

[0070] S144. Determine the target evaluation value according to the standardized indicator evaluation value, the subjective weighting coefficient and the objective weighting coefficient.

[0071] For example, the subjective weighting coefficient and the objective weighting coefficient may be weighted to determine the comprehensive weighting coefficient. For example, the subjective weighting coefficient and the objective weighting coefficient may be averaged to obtain the first comprehensive weighting coefficient corresponding to the voltage-reactive ratio evaluation value. , the second comprehensive weighting coefficient corresponding to the complex power efficiency evaluation value And the third comprehensive weighting coefficient corresponding to the power factor evaluation value .in, , , The target evaluation value can be calculated by the following formula:

[0072] in, is the target evaluation value, is the first comprehensive weighting coefficient, is the standard voltage-reactive ratio evaluation value obtained by standardizing the voltage-reactive ratio evaluation value, is the second comprehensive weighting coefficient, is the standard complex power efficiency evaluation value obtained by standardizing the complex power efficiency evaluation value, is the third comprehensive weighting coefficient, The standard power factor evaluation value is obtained by standardizing the power factor evaluation value. In this way, multiple evaluation indicators can be evaluated by subjective weighting method and objective weighting method, taking into account the objective regularity characteristics of the data and the subjective preference of the user, and improving the accuracy of the evaluation.

[0073] Figure 3 is a flowchart of another power evaluation method according to an exemplary embodiment. Figure 3 , the method comprising: S301 , obtaining initial node parameter information of multiple power sources at multiple nodes in the power grid when the power grid is in steady-state operation.

[0074] The initial node parameter information includes node voltages and load powers of multiple nodes.

[0075] S302: For a designated node, determine the load power according to the node voltage.

[0076] Among them, the load power of the i-th node can be expressed as:

[0077] in, is the load power of the ith node, is the node voltage of the ith node, is the conjugate of the i-th node current, is the conjugate of the load admittance of the ith node, is the complex impedance from the ith node to the jth node, is the current emitted by the jth equivalent current source, is the conjugate of the impedance from the i-th node to the k-th node, is the conjugate of the output current of current source k.

[0078] S303: Determine the target power supply power output by the target power supply of the designated node according to the node voltage and the load power.

[0079] Among them, the target power output by the current source k at the i-th node is expressed as:

[0080] in, is the target power output by the current source k at the i-th node, is the node voltage of the ith node, is the conjugate of the load admittance of the ith node, is the conjugate of the impedance from the i-th node to the k-th node, is the conjugate of the output current of current source k.

[0081] S304 : Determine a target node voltage corresponding to the target power source in the designated node according to the node voltage.

[0082] For example, the node voltage of the i-th node is known to be , the node voltage is the target node voltage corresponding to the jth power supply, expressed as .

[0083] S305: Determine the ratio of the target node voltage to the reactive power in the target power supply power as a voltage-reactive ratio evaluation value.

[0084] The voltage-to-reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power supply in the specified node on the node voltage of the specified node. The reactive power can be the imaginary part of the target power supply power, and the voltage-to-reactive ratio evaluation value can be calculated by the following formula:

[0085] in, is the voltage reactive ratio evaluation value, Indicates the target node voltage The model, is the target node voltage corresponding to power supply i, is the node voltage of load j, is the reactive power output by source i at load j.

[0086] S306: Obtain the total output power of the target power source to the designated node, and determine the ratio of the target power source power to the total output power as a complex power efficiency evaluation value.

[0087] The complex power efficiency evaluation value is used to characterize the efficiency of the designated node receiving the power output by the target power supply, and can be calculated by the following formula:

[0088] in, is the complex power efficiency evaluation value of target battery i at node j, is the total output power of the target power source i to the specified node j, is the target power of target power source i at node j, is the power of target power source i.

[0089] S307: Determine the ratio of the active power in the target power supply power to the apparent power in the target power supply power as a power factor evaluation value.

[0090] The power factor evaluation value is used to characterize the degree of active power in the target power supply power, and can be calculated by the following formula:

[0091] in, is the power factor evaluation value of target battery i at node j, is the active power, is the apparent power.

[0092] S308, normalizing the voltage-to-reactive ratio evaluation value, the complex power efficiency evaluation value, and the power factor evaluation value to obtain a plurality of standardized index evaluation values.

[0093] Among them, the indicator evaluation value can be Through the zero mean normalization method, the value differences between different eigenvalues ​​are eliminated to obtain the standardized index evaluation value . is the voltage reactive ratio evaluation value, is the complex power efficiency evaluation value, It is the reciprocal of the power factor rating value.

[0094] S309: Based on the subjective weighting method, obtain the subjective weighting coefficients corresponding to the multiple indicator evaluation values.

[0095] The subjective weighting method may include a priority diagram method, and the first subjective weighting coefficient corresponding to the voltage-to-reactive ratio evaluation value may be obtained based on the priority diagram method. , the second subjective weighting coefficient corresponding to the complex power efficiency evaluation value And the third subjective weighting coefficient corresponding to the power factor evaluation value .

[0096] S310: Based on the objective weighting method, obtain objective weighting coefficients corresponding to the multiple indicator evaluation values.

[0097] Among them, the objective weighting method may include an entropy weight method, and the first objective weighting coefficient corresponding to the voltage-reactive ratio evaluation value may be obtained based on the entropy weight method. , the second objective weighting coefficient corresponding to the complex power efficiency evaluation value And the third objective weighting coefficient corresponding to the power factor evaluation value .

[0098] S311. Determine the target evaluation value according to the standardized indicator evaluation value, the subjective weighting coefficient and the objective weighting coefficient.

[0099] Among them, the subjective weighting coefficient and the objective weighting coefficient can be weighted to obtain the first comprehensive weighting coefficient corresponding to the voltage-reactive ratio evaluation value: , the second comprehensive weighting coefficient corresponding to the complex power efficiency evaluation value And the third comprehensive weighting coefficient corresponding to the power factor evaluation value The target evaluation value can be calculated by the following formula:

[0100] in, is the target evaluation value, is the first comprehensive weighting coefficient, is the standard voltage-reactive ratio evaluation value obtained by standardizing the voltage-reactive ratio evaluation value, is the second comprehensive weighting coefficient, is the standard complex power efficiency evaluation value obtained by standardizing the complex power efficiency evaluation value, is the third comprehensive weighting coefficient, It is the standard power factor evaluation value obtained by standardizing the power factor evaluation value.

[0101] By adopting the above scheme, the target power output of the target power source for the designated node can be determined by obtaining and according to the node voltage and load power of multiple power sources at multiple power grid nodes when the power grid is in steady state operation, and the voltage reactive ratio evaluation value corresponding to the voltage reactive ratio index, the complex power efficiency evaluation value corresponding to the complex power efficiency index, and the power factor evaluation value corresponding to the power factor index can be determined according to the target power power, and the obtained multiple index evaluation values ​​can be used to determine the target evaluation value corresponding to the target power power through subjective weighting and objective weighting. In this way, the role of a single power source can be separated from the entire power grid for the node, and the line flow results of multiple power sources acting together can be decomposed into the results of a single power source acting alone, so that the ability of a single power source to act alone can be evaluated, which can solve the problem of limitations in existing evaluation methods. At the same time, the accuracy of the evaluation can be improved by using multiple evaluation indicators and evaluating through subjective weighting and objective weighting.

[0102] It should be noted that, for the specific implementation of each step in the above embodiment, reference can be made to the description of the relevant steps in the above embodiment, which will not be repeated here.

[0103] In addition, for the above method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. For example, the above steps S309 and S310 are not limited to the step sequence shown in the current embodiment, and step S310 may be performed first, then step S309, or step S309 and step S310 may be performed simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0104] Figure 4 is a block diagram of a power evaluation device according to an exemplary embodiment. Figure 4 , the device comprises: An acquisition module 401 is used to acquire initial node parameter information of multiple power sources at multiple nodes in the power grid when the power grid is in steady state operation; A first determining module 402 is used to determine, for a designated node, a target power supply power output by a target power supply of the designated node according to the initial node parameter information; A second determination module 403 is used to determine, according to the target power supply power, the index evaluation values ​​corresponding to the multiple evaluation indexes used to evaluate the target power supply power; The third determination module 404 is used to weight the multiple indicator evaluation values ​​to determine a target evaluation value corresponding to the target power supply power.

[0105] Optionally, the initial node parameter information includes node voltages and load powers of multiple nodes; the first determination module 402 is further used to determine the load power based on the node voltage, and determine the target power supply power based on the node voltage and the load power.

[0106] Optionally, the target power source power includes reactive power; the evaluation index includes a voltage reactive ratio index, and the index evaluation value includes a voltage reactive ratio evaluation value, and the voltage reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power source in the specified node on the node voltage of the specified node; the second determination module 403 is used to determine the target node voltage corresponding to the target power source in the specified node based on the node voltage, and determine the ratio of the target node voltage to the reactive power as the voltage reactive ratio evaluation value.

[0107] Optionally, the evaluation index includes a complex power efficiency index, and the index evaluation value includes a complex power efficiency evaluation value, which is used to characterize the efficiency of the designated node in receiving the power output by the target power supply; the second determination module 403 is used to obtain the total output power output by the target power supply to the designated node, and determine the ratio of the target power supply power to the total output power as the complex power efficiency evaluation value.

[0108] Optionally, the target power supply power includes active power and apparent power; the evaluation index includes a power factor index, and the index evaluation value includes a power factor evaluation value, which is used to characterize the degree of active power in the target power supply power; the second determination module 403 is used to determine the ratio of the active power to the apparent power as the power factor evaluation value.

[0109] Optionally, the third determination module 404 is used to standardize the multiple indicator evaluation values ​​to obtain multiple standardized indicator evaluation values, and based on the subjective weighting method, obtain the subjective weighting coefficients corresponding to the multiple indicator evaluation values, and based on the objective weighting method, obtain the objective weighting coefficients corresponding to the multiple indicator evaluation values, and determine the target evaluation value according to the standardized indicator evaluation value, the subjective weighting coefficient and the objective weighting coefficient.

[0110] By adopting the above device, the target power output of the target power source for the designated node can be determined by obtaining and according to the node voltage and load power of multiple power sources at multiple power grid nodes when the power grid is in steady state operation, and the voltage reactive ratio evaluation value corresponding to the voltage reactive ratio index, the complex power efficiency evaluation value corresponding to the complex power efficiency index, and the power factor evaluation value corresponding to the power factor index can be determined according to the target power power, and the obtained multiple index evaluation values ​​can be used to determine the target evaluation value corresponding to the target power power through subjective weighting and objective weighting. In this way, the role of a single power source can be separated from the entire power grid for the node, and the line flow results of multiple power sources acting together can be decomposed into the results of a single power source acting alone, so that the ability of a single power source to act alone can be evaluated, which can solve the problem of limitations in existing evaluation methods. At the same time, the accuracy of the evaluation can be improved by adopting multiple evaluation indicators and evaluating through subjective weighting and objective weighting.

[0111] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0112] Figure 5 FIG. 5 is a block diagram of an electronic device 500 according to an exemplary embodiment. Figure 5As shown, the electronic device 500 may include: a processor 501 , a memory 502 . The electronic device 500 may also include one or more of a multimedia component 503 , an input / output (I / O) interface 504 , and a communication component 505 .

[0113] The processor 501 is used to control the overall operation of the electronic device 500 to complete all or part of the steps in the above-mentioned power evaluation method. The memory 502 is used to store various types of data to support the operation of the electronic device 500. For example, these data may include instructions for any application or method used to operate on the electronic device 500, and application-related data, such as contact data, messages sent and received, pictures, audio, video, etc. The memory 502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 503 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 502 or sent through the communication component 505. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 504 provides an interface between the processor 501 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 505 is used for wired or wireless communication between the electronic device 500 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 505 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0114] In an exemplary embodiment, the electronic device 500 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned power evaluation method.

[0115] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned power evaluation method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 502 including program instructions, and the above-mentioned program instructions can be executed by the processor 501 of the electronic device 500 to complete the above-mentioned power evaluation method.

[0116] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device. The computer program has a code portion for executing the above power evaluation method when executed by the programmable device.

[0117] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0118] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0119] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A power evaluation method, characterized in that: The method comprises: Acquire initial node parameter information of multiple power sources at multiple nodes in the power grid when the power grid is in steady-state operation; For a designated node, determining a target power supply power outputted by a target power supply of the designated node according to the initial node parameter information; Determining, according to the target power supply power, indicator evaluation values ​​corresponding to a plurality of evaluation indicators for evaluating the target power supply power; The multiple indicator evaluation values ​​are weighted to determine a target evaluation value corresponding to the target power supply power.

2. The method according to claim 1, characterized in that The initial node parameter information includes node voltages and load powers of multiple nodes; and determining the target power supply power output by the target power supply of the designated node according to the initial node parameter information includes: Determining the load power according to the node voltage; The target power supply power is determined according to the node voltage and the load power.

3. The method according to claim 2, characterized in that The target power source power includes reactive power; the evaluation index includes a voltage-reactive ratio index, and the index evaluation value includes a voltage-reactive ratio evaluation value, and the voltage-reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power source in the designated node on the node voltage of the designated node; The step of determining, according to the target power supply power, the index evaluation values ​​corresponding to the plurality of evaluation indexes for evaluating the target power supply power comprises: Determining, according to the node voltage, a target node voltage corresponding to the target power source in the designated node; The ratio of the target node voltage to the reactive power is determined as the voltage-reactive ratio evaluation value.

4. The method according to claim 2, characterized in that: The evaluation index includes a complex power efficiency index, the index evaluation value includes a complex power efficiency evaluation value, and the complex power efficiency evaluation value is used to characterize the efficiency of the designated node receiving the power output by the target power supply; The step of determining, according to the target power supply power, the index evaluation values ​​corresponding to the plurality of evaluation indexes for evaluating the target power supply power comprises: Obtaining the total output power outputted by the target power source to the designated node; The ratio of the target power supply power to the total output power is determined as the complex power efficiency evaluation value.

5. The method according to claim 2, characterized in that: The target power supply power includes active power and apparent power; the evaluation index includes a power factor index, the index evaluation value includes a power factor evaluation value, and the power factor evaluation value is used to characterize the degree of active power in the target power supply power; the index evaluation values ​​corresponding to the multiple evaluation indexes used to evaluate the target power supply power are determined according to the target power supply power, including: The ratio of the active power to the apparent power is determined as the power factor evaluation value.

6. The method according to any one of claims 1 to 5, characterized in that: The step of weighting the multiple indicator evaluation values ​​to determine the target evaluation value corresponding to the target power supply power includes: Standardizing the multiple index evaluation values ​​to obtain multiple standardized index evaluation values; Based on the subjective weighting method, obtaining subjective weighting coefficients corresponding to the multiple indicator evaluation values; Based on the objective weighting method, obtaining objective weighting coefficients corresponding to the multiple indicator evaluation values; The target evaluation value is determined according to the standardized indicator evaluation value, the subjective weighting coefficient and the objective weighting coefficient.

7. A power evaluation device, characterized in that: The device comprises: An acquisition module is used to acquire initial node parameter information of multiple power sources at multiple nodes in the power grid when the power grid is in steady-state operation; A first determination module is used to determine, for a designated node, a target power supply power output by a target power supply of the designated node according to the initial node parameter information; A second determining module, configured to determine, according to the target power supply power, an indicator evaluation value corresponding to a plurality of evaluation indicators for evaluating the target power supply power; The third determination module is used to weight the multiple indicator evaluation values ​​to determine a target evaluation value corresponding to the target power supply power.

8. The device according to claim 7, characterized in that The initial node parameter information includes node voltages and load powers of multiple nodes; The first determination module is further used to determine the load power according to the node voltage, and to determine the target power supply power according to the node voltage and the load power.

9. The device according to claim 8, characterized in that The target power source power includes reactive power; the evaluation index includes a voltage-reactive ratio index, and the index evaluation value includes a voltage-reactive ratio evaluation value, and the voltage-reactive ratio evaluation value is used to characterize the effect of the reactive power output by the target power source in the designated node on the node voltage of the designated node; The second determination module is used to determine the target node voltage corresponding to the target power supply in the designated node according to the node voltage, and determine the ratio of the target node voltage to the reactive power as the voltage-reactive ratio evaluation value.

10. The device according to claim 8, characterized in that The evaluation index includes a complex power efficiency index, the index evaluation value includes a complex power efficiency evaluation value, and the complex power efficiency evaluation value is used to characterize the efficiency of the designated node receiving the power output by the target power supply; The second determination module is used to obtain the total output power output by the target power supply to the designated node, and determine the ratio of the target power supply power to the total output power as the complex power efficiency evaluation value.

11. The device according to claim 8, characterized in that The target power supply power includes active power and apparent power; the evaluation index includes a power factor index, and the index evaluation value includes a power factor evaluation value, and the power factor evaluation value is used to characterize the degree of active power in the target power supply power; The second determination module is used to determine the ratio of the active power to the apparent power as the power factor evaluation value.

12. The device according to any one of claims 7 to 11, characterized in that: The third determination module is used to standardize the multiple indicator evaluation values ​​to obtain multiple standardized indicator evaluation values, and based on the subjective weighting method, obtain the subjective weighting coefficients corresponding to the multiple indicator evaluation values, and based on the objective weighting method, obtain the objective weighting coefficients corresponding to the multiple indicator evaluation values, and determine the target evaluation value according to the standardized indicator evaluation value, the subjective weighting coefficient and the objective weighting coefficient.

13. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

14. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

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