Method and system for estimating load model parameters of electric system on line

A load model and power system technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as unrepresentative voltage fluctuations, difficult to estimate frequency of occurrence, and lack of universal applicability

Inactive Publication Date: 2010-12-22
徐文远
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Problems solved by technology

However, since the voltage fluctuations mentioned in these articles are not representative in the power system, and the frequency of occurrence is difficult to estimate, this load model estimation method is not universally applicable, especial

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  • Method and system for estimating load model parameters of electric system on line
  • Method and system for estimating load model parameters of electric system on line
  • Method and system for estimating load model parameters of electric system on line

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[0067] The present invention will be further described below with reference to the drawings and embodiments.

[0068] Figure 7a , The first part of the method is to install voltage and current measuring equipment. In the first power supply mode, the voltage and current measurement unit can be installed on the medium voltage side of the substation. Figure 4 The installation locations of these measuring devices are shown. It is worth mentioning that we can use the existing relay protection or electric energy meter and other measuring equipment in the substation as the measuring unit of the present invention, provided that these equipment can output the voltage and current measurement values ​​required by the present invention. The requirements for these measurements will be highlighted in subsequent articles. Figure 7b For the second power supply mode, the smart meter of the power company is a good platform for use. The second part of the method is to use voltage disturbance. ...

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Abstract

The invention relates to a method and a system for estimating the load model parameters of an electric system on line. When an on-load tap changer of a transformer in a substation is acted or a compensating capacitor in the substation is switched, a monitoring device at the feeder line outlet end of the substation or the junction of a power supply company and users records and analyzes system side disturbance caused by the process so as to estimate the load model parameters, wherein the estimation method comprises the following steps of: (1) detecting voltage disturbance generated by the system per se in real time by using the monitoring device; (2) after detecting the voltage disturbance, judging whether the disturbance is caused by acting the on-load tap changer or switching the compensating capacitor in the substation, if so, executing the step (3), and otherwise, returning to the step (1); (3) calculating relevant voltage and power changes and estimating load parameters according to the voltage and power changes; (4) saving the load parameters calculated on the basis of each-time disturbance in a database; and (5) carrying out regression analysis to mass of data saved in the database and then calculating the load parameters on different times in one day and one season.

Description

technical field [0001] The invention relates to an online estimation method and system for parameters of a power system load model. Background technique [0002] The load of the power system refers to the total active power and reactive power demand of each power user on the feeder or under the substation. The characteristic of load power changing with voltage, or the load model based on voltage, refers to the active and reactive power requirements of the load under different input voltages. As we all know, the size of the load power changes with the fluctuation of the supply voltage. This voltage-dependent load model has a crucial impact on power transmission capacity calculations, voltage stability assessments, and many other related studies of power systems. [0003] In the past 30 years, two types of load model parameter estimation methods have been proposed successively. The first category is based on load type methods. This method relies on the response characteris...

Claims

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Application Information

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IPC IPC(8): H02J13/00H02J3/00
CPCY02E60/723Y04S10/16Y02E60/00
Inventor 徐文远
Owner 徐文远
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