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Method for estimating state of distribution network for supporting large-scale current measurement

A technology for state estimation and network state, which is applied to electrical components, circuit devices, AC network circuits, etc.

Active Publication Date: 2011-02-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for the situation where there are only a few real-time power measurements in the system, and it cleverly converts the state estimation problem into a power flow matching problem, but does not give a processing method that considers voltage and current measurements

Method used

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  • Method for estimating state of distribution network for supporting large-scale current measurement
  • Method for estimating state of distribution network for supporting large-scale current measurement
  • Method for estimating state of distribution network for supporting large-scale current measurement

Examples

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Effect test

Embodiment 1

[0099] Example 1: State Estimation of Radial Distribution Network

[0100] The reference value of the calculation example power used in this embodiment is S B =100MVA, the line voltage reference value is V B = 10kV. The main wiring diagram is as Figure 6 shown. On the basis of the original network, there are charging capacitor branches at nodes 18, 47, 52, 58, and 89, and the reactance value is 1000 ohms.

[0101] In order to consider the state estimation results under different measurement error conditions, this embodiment considers adding different levels of normally distributed measurement errors to form the following calculation example:

[0102] Case 1: The mean value of the node voltage and branch current measurement error is 0, and the variance is 0.000001; the mean value of the root node injection power measurement error is 0, and the variance is 0.000001; the mean value of the load power measurement error is 0, and the variance is 0.01.

[0103] In case 2, the e...

Embodiment 2

[0112] Example 2: Weak Ring Distribution Network

[0113] exist figure 1 Based on the distribution network shown, the three branches 70-10, 90-14 and 54-26 are closed to form a weak ring distribution network.

[0114] In order to consider the state estimation results under different measurement error conditions, the embodiment of the present invention considers adding different levels of normally distributed measurement errors to form the following calculation example:

[0115] Case 1: The mean value of node voltage and branch current measurement error is 0, and the variance is 0.000001; the mean value of root node injected power measurement noise is 0, and the variance is 0.000001; the mean value of load power measurement noise is 0, and the variance is 0.01.

[0116] Case 2: The error variance of the load power measurement is increased to 0.05, and the rest of the measurement configuration remains unchanged.

[0117] Case 3: The error variance of the load power measurement...

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Abstract

The invention relates to a method for estimating state of a distribution network for supporting large-scale current measurement, and belongs to the automatic dispatching field of power systems. The method comprises the following steps of: squaring a branch head end power and a branch current amplitude to obtain an evaluated variable, and establishing a new state estimation model of an exponentialtarget function according to a power grid model of an actual power grid and real-time measurement data; and estimating the branch head end power and the branch current amplitude by adopting a Lagrangian multiplier method so as to calculate active power and passive power of equipment such as a circuit, a transformer, a generator, a load and the like. The method can directly establish measurement equations for branch current amplitude measurement, branch power measurement, node voltage measurement and injection power measurement, does not need measurement conversion, does not introduce measurement conversion errors, is convenient to implement, and has high calculation efficiency.

Description

technical field [0001] The invention relates to a distribution network state estimation method supporting large-scale current measurement, and belongs to the technical field of power system scheduling automation and power grid simulation. Background technique [0002] The distribution network is different from the transmission network, and its measurement redundancy is insufficient. Only the voltage amplitude and power measurement are available at the root of the feeder, and generally only the current amplitude measurement is collected on the feeder switch. According to the measurement configuration characteristics of the distribution network, many literatures have studied the state estimation of the distribution network. According to the selection of the state quantity, the state estimation methods of the distribution network can be divided into: [0003] (1) The method using the node voltage as the state quantity [0004] Lu, C.N., Teng J.H, Liu, W.-H E. Distribution Syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 吴文传张伯明孙宏斌巨云涛
Owner TSINGHUA UNIV
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