Probability evaluation method for power adjustable capability of virtual power plant

A virtual power plant, power technology, applied in the direction of AC network voltage adjustment, power network operating system integration, AC network with the same frequency from different sources, etc., can solve the problem that does not consider the impact of virtual power plant renewable energy and load uncertainty, Huge difference in characteristics, slow calculation speed, etc.

Active Publication Date: 2020-10-30
TSINGHUA UNIV
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Problems solved by technology

However, due to the large number and small scale of distributed generation resources, they are scattered in the distribution network and have huge differences in characteristics.
Therefore, it is difficult for the system to directly control all distributed generation resources
Virtual power plants can integrate the above-mentioned distributed power sources. However, due to different equipment characteristics, network constraints, and a large number of uncertain factors such as load and new energy output, it is currently difficult to accurately evaluate the power adjustment capabilities of virtual power plants.
[0003] Existing methods for evaluating the power adjustable capacity of virtual power plants use deterministic evaluation methods and do not consider the impact of uncertainties in renewable energy and loads within virtual power plants.
There are also methods that generate multiple scenarios through the Monte Carlo method, and then construct the power adjustable capacity model of the virtual power plant under uncertain factors, but this method has a huge amount of calculation and slow calculation speed, and it is difficult to quickly obtain effective evaluation results

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  • Probability evaluation method for power adjustable capability of virtual power plant
  • Probability evaluation method for power adjustable capability of virtual power plant
  • Probability evaluation method for power adjustable capability of virtual power plant

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Embodiment Construction

[0119] The present invention proposes a probability assessment method for the power adjustable capability of a virtual power plant. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0120] A probabilistic evaluation method for the power adjustable capacity of a virtual power plant proposed by the present invention, the overall process is as follows figure 1 As shown, the method includes the following steps:

[0121] 1) Construct the network model of the virtual power plant;

[0122] Based on the decoupled linearized power flow model, each node inside the virtual power plant is defined as a PQ node, and the grid-connected node is defined as a balance node. The network power flow model of the virtual power plant is established as follows:

[0123] V L = L -1 Q-L -1 G LL B' LL -1 P (1)

[0124] θ L =H -1 P+H -1 G LL B LL -1 Q (2)

[0125] Among them, V L Represents the vector f...

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Abstract

The invention provides a probability evaluation method for the power adjustable capability of a virtual power plant, and belongs to the technical field of power system operation and control. The method comprises the steps of performing decoupling linear approximation on a power flow model of a virtual power plant, and constructing a power flow equation in a matrix form; performing linearization processing on active-reactive power ranges output by various types of power generation equipment and energy storage equipment; constructing a Gaussian mixture model to perform probability distribution function fitting on uncertain factors such as photovoltaics, fans and loads; solving a power adjustable range of the virtual power plant at the grid-connected point under equal confidence by utilizingan opportunity constraint method; and in the active-reactive two-dimensional plane, calculating a scalar field function of the adjustable range and the confidence coefficient to obtain the virtual power plant power adjustable capability under different confidence coefficients. According to the method, the influence of uncertain factors on the power adjustable capability of the virtual power plantis fully considered, the calculation speed is effectively improved, a more accurate evaluation result can be obtained, and optimal scheduling of a power system is promoted.

Description

technical field [0001] The invention belongs to the technical field of operation control of electric power systems, and in particular relates to a probability evaluation method for power adjustable capacity of a virtual power plant. Background technique [0002] The virtual power plant organically integrates distributed generating units, controllable loads and distributed energy storage facilities, and uses advanced control technology and communication technology to realize the integrated control of various distributed energy sources. In a region, the virtual power plant can be used as a special power plant to participate in the optimal dispatch of the power system. However, due to the large number and small scale of distributed generation resources, they are scattered in the distribution network and have huge differences in characteristics. Therefore, it is difficult for the system to directly control all distributed generation resources. Virtual power plants can integrat...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q10/06G06Q30/02G06Q50/06H02J3/00H02J3/06H02J3/14H02J3/28H02J3/38H02J3/40H02J3/46
CPCG06Q10/04G06Q10/0639G06Q30/0283G06Q50/06H02J3/00H02J3/38H02J3/46H02J3/40H02J3/28H02J3/06H02J3/14Y02E10/56Y02E70/30Y04S20/222Y04S10/50Y04S50/14Y02B70/3225
Inventor 吴文传孙宏斌王思远郭庆来王彬
Owner TSINGHUA UNIV
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