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A Practical Method for Simple State Estimation of Distribution Network

A state estimation and distribution network technology, applied to load forecasting, electrical components, circuit devices, etc. in the AC network, can solve inconsistencies in processing methods, simplification of unreasonable electrical connection relationships, and difficulty in ensuring complete matching of power distribution master stations, etc. problem, to achieve the effect of fast calculation speed and accuracy, and significant identification effect

Inactive Publication Date: 2021-07-16
STATE GRID CORP OF CHINA +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In reality, when the contact switch between feeders is closed, it is impossible to determine which feeder the load / distribution transformer is powered by, and it is not possible to simply generate a distribution island from one feeder, which is unreasonable to simplify the electrical connection relationship; in fact, not all distribution transformers are With the measurement configuration and measurement data, it is difficult to ensure that the distribution transformer and the main power distribution station are completely matched. The way the existing technology handles the load / distribution transformer is unreasonable; the remote signaling of the switch / knife switch is considered in the prior art The values ​​are correct, only the switch telemetry values ​​are preprocessed, and the processing is not as it should be

Method used

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  • A Practical Method for Simple State Estimation of Distribution Network
  • A Practical Method for Simple State Estimation of Distribution Network
  • A Practical Method for Simple State Estimation of Distribution Network

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Embodiment Construction

[0050] Technical terms among the present invention are set forth as follows:

[0051] Topological tree generation: According to the connection nodes of electrical equipment, search for associated equipment, and store the searched equipment in a tree storage structure representing the parent-child sibling relationship. The generated topology tree represents the connection relationship between devices and the hierarchical relationship between upstream and downstream. The invention generates a tree-like storage structure including equipment such as busbars, switches, loads / distribution transformers, etc., which is convenient for searching the topology tree of equipment connection relationship and hierarchical relationship.

[0052] Daily load forecasting: For the historical load data of the distribution transformer, the load data every five minutes in the next 24 hours is predicted by the similar daily linear extrapolation method, and the predicted load value is used as the real-...

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Abstract

The invention relates to a method for state estimation in the electrical field, in particular to a practical method for simple state estimation of a distribution network, comprising the following steps: (1) historical section data matching; (2) distribution network topology tree generation; (3) Switch remote signal identification; (4) Remote measurement completion; (5) Loop closure analysis; (6) Assessment statistics; (7) Daily load forecasting. This application provides a practical method for simple state estimation of a distribution network, so as to identify the remote signal value of the switch / knife switch, complement the switch telemetry value, and estimate the most reliable system operating state.

Description

technical field [0001] The invention relates to a method for state estimation in the electrical field, in particular to a practical method for simple state estimation of a distribution network. Background technique [0002] State estimation is also called "filtering", which uses the redundancy of the measurement system to eliminate unreasonable error data, improve the accuracy of the data, estimate the operating state of the system, and provide credible and consistent power flow data. Distribution network state estimation is the basis of distribution network analysis, which can provide credible and consistent basic data for advanced applications such as reactive power optimization and voltage reactive power control. While improving data reliability, it improves the practical level of various advanced applications. [0003] At present, there are few measurement configurations in the distribution network, and the level of intelligence and automation is low. Using the meterin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J3/003
Inventor 崔立忠张瑞雪程向向郭秋野马志斌
Owner STATE GRID CORP OF CHINA
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