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Stability analysis system and method of time-varying power system

A power system and time-varying system technology, which is applied in the fields of climate change adaptation, electrical digital data processing, and special data processing applications, and can solve problems such as ignoring the stability of the power system on the grid side of wind turbines

Active Publication Date: 2015-06-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the difficulties of the prior art, avoiding the stability analysis of the wind power generator itself, thus ignoring the stability of the grid-side power system after the wind power generator is connected; The oscillation mode of the grid-side power system is the analysis target when the wind power changes, so the problem of large-scale changes in the operating conditions of the system due to large output fluctuations of wind turbines is ignored

Method used

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  • Stability analysis system and method of time-varying power system
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  • Stability analysis system and method of time-varying power system

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example 1

[0239] Taking the measured wind speed data of a wind farm within one month as an example, the cut-in wind speed is 3m / s, the rated wind speed is 12m / s, and the cut-out wind speed is 22m / s. The output power curve of the fan is as follows: figure 2 shown. Divide the wind speed into 10 modes with 1m / s as the interval width to form a continuous Markov model state set, denoted as S={1,2,…,10}, and the information of each mode is in image 3 given in.

[0240] according to image 3 In the mode division, the Weibull distribution is fitted to the conditional wind speed probability density curve in each wind speed mode, and the fitting results are as follows Figure 4 shown. according to Figure 4 According to formula (1), the wind speed probability density matrix of each condition is obtained as shown in formula (28).

[0241] build as Figure 5 The shown IEEE4 machine 11 node system, the system includes two areas, area 1 and area 2, where generator 1 and generator 2 are locate...

example 2

[0248] build as Figure 8 The shown IEEE16-machine 68-node system further examines the validity and versatility of the time-varying power system stability analysis method considering the random characteristics of wind speed. The system can be divided into 5 areas, of which areas 1, 2 and 3 are equivalent systems, area 4 is the New York system, area 5 is the New England system, and the generator G16 in area 3 is replaced by a power source of equal capacity Simulate the change of fan output power. The generator adopts 6-order detailed model, the excitation adopts IEEE-DC1 type excitation, the load model adopts WECC load model, 80% of constant active load, 80% of constant reactive impedance load, and 20% of dynamic load.

[0249] First, the SMA method is used to reduce the order of the system state matrix under each working condition, and the reduced system state matrix and the probability density transition matrix shown in Equation (28) are substituted into Equation (27), and t...

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Abstract

The invention discloses a stability analysis system and method of a time-varying power system. The system comprises a data acqusition module, a wind velocity fitting prediction module, a time-varying system establishment and order reduction module, a stability criterion solving module and a result output module, wherein the data acqusition module is used for acquiring data; the wind velocity fitting prediction module is used for performing fitting prediction on conditional wind velocity trend in short time, sectioning the wind velocity and calculating a conditional characteristic wind velocity probability density matrix of each section according to a fitting model; the time-varying system establishment and order reduction module is used for establishing a continuous markov time-varying power system model considering a wind velocity random characteristic and reducing order of the system; the stability criterion solving module is used for solving whether the system is stable by using a feasibility problem solving method in a linear matrix inequality. Through the stability analysis system and method of the time-varying power system, the problem that the stability of the time-varying power system is difficult to distinguish caused by the wind velocity random characteristic in case of fan connection can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of power system analysis and control, in particular to the stability analysis technology of a time-varying power system. Background technique [0002] The development of wind power is an important part of the future energy strategies of countries around the world, but the fluctuation of wind turbine output often leads to changes in the operating conditions of the system, which brings huge risks to the safety, stability and economic operation of the power system. Therefore, it is urgent to conduct an in-depth analysis of the stability of time-varying power systems with random characteristics of wind speed. [0003] In the prior art, the stability analysis technology of the power system under the connection of wind power is mainly divided into two categories, one is based on the stability analysis of the wind turbine itself, and the other is based on the stability analysis under the single operating condition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00H02J3/38
CPCY02A30/00
Inventor 马静高翔李益楠邱扬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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