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Energy internet harmonic power flow calculating method

An energy internet, harmonic flow technology, applied in AC networks to reduce harmonics/ripples, harmonic reduction devices, AC networks with the same frequency from different sources, etc., can solve the uncertainty of node injection harmonic current, The random fluctuation of distributed power generation and the uncertainty of grid-connected node power are not considered, so as to achieve the effect of improving computing efficiency, computing time and accuracy.

Inactive Publication Date: 2017-08-18
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0005] However, the above method does not take into account the large random fluctuations in the output of distributed generation (DG). Therefore, the power of grid-connected nodes is uncertain, which will lead to the uncertainty of the harmonic current injected into the nodes, which will bring energy to the Internet of Things. Uncertain Harmonic Power Flow Problem

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  • Energy internet harmonic power flow calculating method
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  • Energy internet harmonic power flow calculating method

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Embodiment 1

[0071] Please refer to figure 2 , Embodiment 1 of the present invention is:

[0072] A method for calculating harmonic power flow of the energy internet, comprising:

[0073] S1: Obtain the power of nodes in the energy Internet of Things;

[0074] Specifically, measure the power of nodes in the energy Internet of Things, and obtain data samples through multiple measurements, where the power includes output power, etc.;

[0075] S2: use the reverse cloud generator to establish a cloud model for each output power of the uncertain node, and obtain the eigenvalue of the cloud model, and the uncertain node is a node corresponding to the DG with uncertain output power;

[0076] Specifically, first use the reverse cloud generator to measure the data x of uncertain nodes in the power grid i (that is, load or output power) for modeling, the specific formula is as (1)-(3):

[0077]

[0078]

[0079]

[0080] From equations (1)-(3), the model eigenvalue C(E x ,E n ,H e )...

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Abstract

The invention provides an energy internet harmonic power flow calculating method. The method comprises the following steps: obtaining electric quantity of nodes in an energy internet; carrying out modeling on each output power of each indeterminate node by utilizing a backward cloud generator to obtain characteristic values, wherein each indeterminate node is a node, the output power of which is uncertain and which is corresponding to DG; obtaining an uncertainty interval of the output power according to the characteristic values; carrying out one-time deterministic load flow calculation on each output power in the uncertainty interval to obtain a central value of flow output; obtaining flow output range according to the central value of the flow output; calculating harmonic current of each node according to the flow output in the range; calculating harmonic parameters of components, except the DG, in the energy internet; carrying out calculation according to the harmonic parameters and the harmonic current to obtain harmonic voltage of each node; and calculating voltage total harmonic distortion of the nodes according to the harmonic voltage of the nodes. The method has the advantages of being accurate in calculation and high in calculation efficiency.

Description

technical field [0001] The invention relates to the field of power system analysis and calculation, in particular to a method for calculating harmonic power flow in the energy internet. Background technique [0002] Energy Internet is regarded as the product of the integration of information and communication technology and energy technology, which will provide possible solutions for transforming energy development mode and realizing sustainable development. However, with a large number of power electronic devices (such as energy routers, etc.), sensitive loads and When the wave distributed generation (Distributed Generation, DG) is connected to the Energy Internet, its harmonic problem will gradually spread from a local problem to a system problem, reducing the ability of the Energy Internet to provide high-quality power supply. [0003] Harmonic power flow calculation is an important means to study the harmonic problems in the power flow of the system. Through the harmonic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/06
CPCH02J3/01H02J3/06Y02E40/40
Inventor 王继业赵光
Owner STATE GRID CORP OF CHINA
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