Micro-grid probability load flow calculation method

A technology of probabilistic power flow calculation and microgrid, which is applied to electrical components, circuit devices, AC network circuits, etc., and can solve problems such as uncertainty and time variation

Inactive Publication Date: 2013-01-02
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

But in fact, the above operating conditions, especially the node power injection, are not only time-varying, but also uncertain

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Embodiment Construction

[0016] In order to facilitate understanding of the present invention, the following will be described in conjunction with the accompanying drawings.

[0017] This invention proposes a method for calculating the probabilistic power flow of a microgrid, please refer to figure 1 , including the steps:

[0018] S101, node numbering, forming a node admittance matrix;

[0019] S102. Calculate semi-invariants of each order of injected power of each node;

[0020] According to the probability distribution of node injection power, the semi-invariant of each order of injection power of each node is calculated, which includes the mean value and variance.

[0021] S103, calculating the mean value of the power flow of the microgrid;

[0022] According to the principle of the two-point estimation method, the mean value of the microgrid power flow is calculated, and the mean value of the Jacobian matrix of the last iteration is obtained for subsequent calculations.

[0023] S104. Obtain ...

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Abstract

The invention provides a method for implementation of micro-grid probability load flow analysis. The method includes the steps: numbering each node in a micro-grid, and forming a node admittance matrix according to micro-grid system data; working out semi-invariants of each stage of injection power according to probability distribution of each node injection power; aiming at uncertainty node injection powers, using the statistic method to obtain a mean value of micro-grid load flow and obtain a Jacobi matrix mean value of the last iteration; obtaining semi-invariants of each stage of system state variables according to the semi-invariants of each stage of each node injection power and the Jacobi matrix mean value of the last iteration; working out each coefficient of Gram-Charlier stages corresponding to a probability distribution function according to the semi-invariants of each stage of system state variables; approximately representing state variable probability distribution by means of Gram-Charlier stage truncation, and working out probability of events such as threshold crossing. Micro-grid probability load flow solution is realized by means of the conception of probability and mathematical statistics of the semi-invariants and the Gram-Charlier stages, uncertainty can be reflected, and micro-grid planning and evaluation on the micro-grid by operators can be facilitated.

Description

technical field [0001] The invention relates to the field of power system operation analysis, in particular to the realization of probabilistic power flow calculation of micro-grid. Background technique [0002] Microgrid power flow calculation is the calculation of microgrid power distribution, power loss and bus voltage. Provide evidence for weaknesses. [0003] Deterministic power flow calculation is the process of solving the operating state of the microgrid under the condition of a certain topology and a given node power injection. The method of applying deterministic power flow calculation can solve the power distribution and voltage solution of the microgrid in a single time section within the allowable range of error. But in fact, the above operating conditions, especially the node power injection, are not only time-varying, but also uncertain. The deterministic power flow calculation of the microgrid cannot reflect this uncertainty. The present invention proposes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCY02P80/14
Inventor 刘明波董萍简淦杨赵建宁刘相枪王朝硕田应富
Owner SOUTH CHINA UNIV OF TECH
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