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Voltage quality probability estimation method for droop control type island microgrid

A technology of voltage quality and microgrid, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problem of difficult implementation of voltage quality probability assessment of droop control island microgrid

Inactive Publication Date: 2018-09-28
XIAN UNIV OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a voltage quality probability assessment method for droop-controlled island microgrids, which solves the problem that it is difficult to implement voltage quality probability assessments for droop-controlled island microgrids in the prior art

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  • Voltage quality probability estimation method for droop control type island microgrid
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  • Voltage quality probability estimation method for droop control type island microgrid

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Embodiment Construction

[0099] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0100]The present invention is a droop control type isolated island microgrid voltage quality probability evaluation method, the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0101] Step 1. Establish a deterministic power flow calculation model for the droop control island microgrid, and implement it according to the following steps:

[0102] Step 1.1. Establish a deterministic power flow calculation model for the droop control island microgrid:

[0103]

[0104] Among them, P Gi , Q Gi Respectively, the power active power and reactive power of the power supply; P Li , Q Li Respectively, the power active power and reactive power of the load; U i and U j are the voltages of nodes i and j respectively; G ij and B ij are the real and imaginary parts of the nodal admittance matrix elements; θ ij is ...

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Abstract

The invention discloses a voltage quality probability estimation method for a droop control type island microgrid, which comprises the following steps: firstly, establishing a deterministic power flowcalculation model for the droop control island microgrid; and then, calculating by means of a correlation coefficient matrix rho of the node injection power to obtain a correlation coefficient rho0 of the corresponding standard normal distribution vector; generating independent point-column matrices Un*M, which are uniformly distributed, obtaining a random variable matrix Yn*M of the independentstandard normal distribution by means of the independent point-column matrix Un*M according to a principle of equal probability conversion; converting Yn*M into a standard normal distribution sequencematrix Zn*M with a correlation coefficient matrix of rho0; converting Zn*M into a sample matrix Xn*M which, with the correlation coefficient equal to rho, submits to the same distribution type as thenode injection power; and using the Newton-Raphson method to carry out resolution and probability statistics on the sample matrix Xn*M to obtain voltage quality probability indexes of node voltage mean, standard deviation, out-of-limit rate, maximum value and the like. The voltage quality probability estimation method for the droop control type island microgrid in the present invention solves theproblem that the voltage quality probability estimation of the droop control island microgrid is difficult to implement in the prior art.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to a voltage quality probability evaluation method of a droop-controlled island micro-grid. Background technique [0002] In recent years, microgrid theory and technology have developed rapidly, and a microgrid system with multiple distributed generation (DistributedGeneration, DG) networking has become an inevitable trend. In addition to the random fluctuation of load power in the traditional power grid in the microgrid, due to the dynamic random fluctuation of external environmental conditions such as wind speed or light intensity, the output power of wind turbines or photovoltaic power generation units also presents large random fluctuations, and these Random fluctuations in power will adversely affect the voltage quality of the system. [0003] Microgrid has two operating states: grid-connected and islanded. An island microgrid composed of multiple netwo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/381H02J3/46H02J3/388H02J2203/20
Inventor 潘忠美刘健
Owner XIAN UNIV OF TECH
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