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Static voltage stability probability assessment method for drooping control island microgrid

A static voltage stabilization and micro-grid technology, applied in photovoltaic power generation, wind power generation, electrical components, etc., can solve problems such as poor effect and difficult implementation

Active Publication Date: 2018-03-23
XIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a static voltage stability probability assessment method for droop-controlled island microgrids, which solves the difficulty in implementing static voltage probability assessments for island microgrids with droop-controlled distributed power sources in the prior art, and uses other methods Problems with poor evaluation

Method used

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  • Static voltage stability probability assessment method for drooping control island microgrid
  • Static voltage stability probability assessment method for drooping control island microgrid
  • Static voltage stability probability assessment method for drooping control island microgrid

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Effect test

Embodiment

[0081] refer to figure 2 , the micro-source is configured by the IEEE33 node system and runs in an isolated manner.

[0082] Step 1. Set A in the load model pi =A qi =0.3, B pi =B qi = 0.3, C pi =C qi =0.4; load static frequency characteristic coefficient, k Lpi = 2, k Lqi =-2. Connect four droop-controlled micro-sources to the system to form a micro-grid, which is disconnected from the main network and operated as an isolated island, and a load of 0.06+j0.03 is connected to node 1. Each micro-source access position and per unit value (rated capacity S B =1MVA), as shown in Table 1.

[0083] Table 1. Access position and parameters of controllable micro-source

[0084] DG#

node

Rated Capacity

U 0

ω 0

m pi

n qi

1

18

0.7

1.06

1.004

1.333e-2

0.300

2

22

1.0

1.06

1.004

1.000e-2

0.200

3

25

2.5

1.06

1.004

4.000e-3

0.080

4

33

3.0

1.06

1.004

3.333e...

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Abstract

The invention discloses a static voltage stability probability assessment method for a drooping control island microgrid. The method include a step 1 of establishing a nonlinear planning model; a step2 of calculating the expectation of input random variables and the standard deviation of each variable and determining the correlation coefficient variables between the variables; a step 3 of solvinga covariance matrix according to the standard deviation of each random variable and the correlation coefficient between the variables; a step 4 of determining Sigma sample points by using a symmetrical sampling strategy; a step 5 of substituting each Sigma sample point into the nonlinear planning model in step 1 for optimization solution to obtain the output corresponding to each input sample point, and the sigma point set of a load clearance factor; and a step 6 of according to weighting the mean value and the weight of the covariance obtained in step 4 to finally obtain the mean value and covariance matrix of the load clearance factor. The method has obvious advantages in terms of calculation speed.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and relates to a static voltage stability probability evaluation method of a droop-controlled island micro-grid based on a traceless transformation method and taking into account the correlation of random variables. Background technique [0002] In recent years, microgrid theory and technology have developed rapidly, and the microgrid system of multiple distributed power generation networks has become an inevitable trend. Microgrid has two operating states: grid-connected and islanded. The microgrid operating in an isolated island has the characteristics of small scale and relatively fragile structure, and its static voltage stability problem is more prominent than that of the larger grid. At the same time, the high proportion of intermittent distributed power sources such as distributed wind power and photovoltaic power generation in the microgrid, the random fluctuation of its outpu...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/383H02J3/386H02J3/388H02J2203/20Y02E10/56Y02E10/76
Inventor 潘忠美陈鲁鹏付欢欢杨震刘飞刘健同向前
Owner XIAN UNIV OF TECH
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