CN-121978610-A - Electric energy meter calibration method and calibration system

CN121978610ACN 121978610 ACN121978610 ACN 121978610ACN-121978610-A

Abstract

The invention discloses an electric energy meter calibration method and a calibration system, which relate to the technical field of electric energy metering and comprise the steps of constructing a topological correlation structure for representing a loss local sensitive area in an electric energy transmission process, adopting an impedance dynamic identification algorithm for fusing local propagation characteristics of node voltage phases, taking the topological correlation structure as constraint, determining dynamic impedance distribution of electric energy transmission among nodes, identifying sensitive conduction nodes causing a phenomenon of electric energy loss space concentration by utilizing local response characteristics of node voltage disturbance based on the dynamic impedance distribution, carrying out decoupling reconstruction on an electric energy loss path of a user electric energy meter according to the dynamic impedance distribution of the sensitive conduction nodes and combining interaction characteristics of node load currents and voltage phases, and determining a calibration compensation coefficient of the user electric energy meter.

Inventors

XIE YUANWEN
YANG JUEXIAN
XIAO JINGQUN
WANG JING
ZENG ZHIHONG
WANG KE
CHEN KAILIANG
Jiang Gengzhen

Assignees

广东博立科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260225

Claims (10)

1. A method of calibrating an electrical energy meter, comprising: according to the reading difference values between the total table of the platform area and each user electric energy meter under a plurality of typical operation conditions, and combining the local disturbance characteristics of the node voltage phase, constructing a topological association structure for representing a loss local sensitive area in the electric energy transmission process; Adopting an impedance dynamic identification algorithm fused with the local propagation characteristics of the node voltage phase, and determining dynamic impedance distribution of power transmission among nodes by taking the topological association structure as constraint; Based on the dynamic impedance distribution, identifying sensitive conduction nodes causing the phenomenon of electric energy loss space concentration by utilizing local response characteristics of node voltage disturbance; And according to the dynamic impedance distribution of the sensitive conduction node, decoupling and reconstructing an electric energy loss path of the user electric energy meter by combining the interaction characteristics of the node load current and the voltage phase, and determining a calibration compensation coefficient of the user electric energy meter.
2. The method of claim 1, wherein constructing a topological correlation structure that characterizes locally sensitive areas of loss during power transfer comprises: Extracting reading difference values of total tables of a plurality of typical operation conditions and a user electric energy meter, and determining an initial sensitive area according to the space diffusion speed difference of node voltage phase disturbance; According to the topological communication degree of the path of node voltage phase disturbance propagation, combining the spatial distribution concentrated trend of the voltage disturbance in the initial sensitive area, and identifying a local sensitive area of electric energy loss; And constructing a topological association structure according to the identified spatial node connection relation of the electric energy loss local sensitive area.
3. The method of claim 2, wherein identifying a locally sensitive region of power loss comprises: Establishing a spatial diffusion communication network of node voltage phase disturbance in an initial sensitive area, and obtaining local key nodes of disturbance propagation according to the spatial propagation stability characteristics in the network; And identifying a local sensitive area of the electric energy loss according to the spatial concentration degree of the voltage disturbance propagation in the local key node.
4. The method of claim 1, wherein determining the dynamic impedance profile of the power transfer between nodes comprises: constructing an initial propagation correlation matrix among nodes based on the cross communication characteristic of the node voltage phase disturbance propagation paths in the topological correlation structure; Identifying initial impedance variation trend among nodes according to the spatial difference variation mode of voltage disturbance propagation in the initial propagation correlation matrix; And the spatial coupling characteristics of the load current disturbance response and the initial impedance change trend of the nodes are fused, and the dynamic impedance distribution of the power transmission between the nodes is determined.
5. The method of claim 4, wherein identifying initial impedance trends between nodes comprises: Extracting a space intensity alternating mode of node voltage phase disturbance propagation in an initial propagation correlation matrix; And carrying out space difference identification on the initial impedance among the nodes by using a space strength alternating mode to obtain an initial impedance change trend.
6. The method of claim 1, wherein identifying the sensitive conductive nodes that cause spatial concentration of electrical energy losses comprises: determining an impedance space abnormal region according to the space abrupt change characteristic of the dynamic impedance distribution; Extracting a space synchronous response characteristic of node voltage disturbance response in the impedance space abnormal region; And identifying the sensitive conduction nodes according to the node voltage disturbance concentrated distribution mode of the spatial synchronous response characteristic.
7. The method of claim 6, the determining an impedance spatial anomaly region comprising: Calculating the spatial variation gradient of dynamic impedance distribution between adjacent nodes to obtain impedance spatial abrupt change characteristics; And determining an impedance space abnormal region according to the space aggregation degree of the impedance space abrupt change characteristics in the node set.
8. The method of claim 1, the determining a calibration compensation coefficient for a user power meter, comprising: Determining a preliminary coupling area of an electric energy loss path according to the dynamic impedance distribution of the sensitive conduction node and the node load current space interaction characteristic; based on a space alternating response mode of node voltage phase and load current in the preliminary coupling region, performing space decoupling reconstruction on the electric energy loss path; and determining a calibration compensation coefficient of the user electric energy meter according to the electric energy loss path space characteristics after decoupling and reconstruction.
9. The method of claim 8, the determining a preliminary coupling region of a power loss path comprising: Extracting the spatial phase difference distribution between the dynamic impedance of the sensitive conduction node and the load current of the user node; And determining a preliminary coupling area of the electric energy loss path according to the spatial concentration mode of the spatial phase difference distribution.
10. An electric energy meter calibration system implemented based on the method of any one of claims 1-9, comprising: The construction module is used for constructing a topological correlation structure representing a loss local sensitive area in the power transmission process according to the reading difference values between the total table of the platform area and each user electric energy meter under a plurality of typical operation conditions and by combining the local disturbance characteristics of the node voltage phase; the determining module is used for determining dynamic impedance distribution of power transmission among nodes by adopting an impedance dynamic identification algorithm fused with the local propagation characteristics of the node voltage phase and taking the topological association structure as constraint; The identification module is used for identifying sensitive conduction nodes causing the phenomenon of electric energy loss space concentration by utilizing the local response characteristics of node voltage disturbance based on the dynamic impedance distribution; And the calibration module is used for carrying out decoupling reconstruction on the electric energy loss path of the user electric energy meter according to the dynamic impedance distribution of the sensitive conduction node and combining the interaction characteristics of the node load current and the voltage phase, and determining the calibration compensation coefficient of the user electric energy meter.

Description

Electric energy meter calibration method and calibration system Technical Field The invention relates to the technical field of electric energy metering, in particular to an electric energy meter calibration method and an electric energy meter calibration system. Background The electric energy metering precision in the current power distribution network is an important basis for guaranteeing fair electric power trade. However, many complicated working conditions exist in actual operation, so that the static calibration method of the electric energy meter is difficult to fully adapt to the dynamic characteristics of the network, and the electric energy loss is unevenly distributed. Especially under the condition of severe load fluctuation, the traditional metering calibration means is difficult to effectively capture the inherent correlation between the impedance characteristics between nodes and the load variation, and metering errors are further aggravated. In addition, most of the current electric energy metering and calibrating technologies only pay attention to metering deviation of a single electric energy meter, neglect propagation rules and mutual influence of voltage and current disturbance in space in a distribution network topological structure, and cannot accurately position an electric energy loss sensitive area. More importantly, in the prior art, when an electric energy loss path is analyzed, an effective identification method for interaction between load current and voltage disturbance is lacked, so that a calibration result is disjointed from an actual running state, and long-term fine management is difficult to realize. Therefore, how to implement an electric energy meter calibration method capable of describing the sensitive characteristics of the electric energy loss in the network and dynamically adapting to the change of the actual operation condition has become an important technical problem to be solved in the field of power distribution metering. Disclosure of Invention The invention aims to provide an electric energy meter calibration method and a calibration system, which are used for solving the problems in the background technology. In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a method for calibrating an electric energy meter, including: according to the reading difference values between the total table of the platform area and each user electric energy meter under a plurality of typical operation conditions, and combining the local disturbance characteristics of the node voltage phase, constructing a topological association structure for representing a loss local sensitive area in the electric energy transmission process; Adopting an impedance dynamic identification algorithm fused with the local propagation characteristics of the node voltage phase, and determining dynamic impedance distribution of power transmission among nodes by taking the topological association structure as constraint; Based on the dynamic impedance distribution, identifying sensitive conduction nodes causing the phenomenon of electric energy loss space concentration by utilizing local response characteristics of node voltage disturbance; And according to the dynamic impedance distribution of the sensitive conduction node, decoupling and reconstructing an electric energy loss path of the user electric energy meter by combining the interaction characteristics of the node load current and the voltage phase, and determining a calibration compensation coefficient of the user electric energy meter. In a second aspect, the present invention provides an electric energy meter calibration system, implemented based on the method described above, including: The construction module is used for constructing a topological correlation structure representing a loss local sensitive area in the power transmission process according to the reading difference values between the total table of the platform area and each user electric energy meter under a plurality of typical operation conditions and by combining the local disturbance characteristics of the node voltage phase; the determining module is used for determining dynamic impedance distribution of power transmission among nodes by adopting an impedance dynamic identification algorithm fused with the local propagation characteristics of the node voltage phase and taking the topological association structure as constraint; The identification module is used for identifying sensitive conduction nodes causing the phenomenon of electric energy loss space concentration by utilizing the local response characteristics of node voltage disturbance based on the dynamic impedance distribution; And the calibration module is used for carrying out decoupling reconstruction on the electric energy loss path of the user electric energy meter according to the dynamic impedance distr