Combination optimizing method, considering dynamic frequency constraint, for isolated power grid set comprising high-permeability photovoltaic power supply

A dynamic frequency, photovoltaic power technology, applied in the field of power system operation, analysis and scheduling, can solve problems such as lack of consideration of dynamic frequency constraints

Active Publication Date: 2016-02-03
WUHAN UNIV +1
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  • Abstract
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Problems solved by technology

[0005] The present invention aims at the lack of consideration of dynamic frequency constraints in the existing unit combination technology, thereby providing a unit combination method considering dynamic frequency constraints

Method used

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  • Combination optimizing method, considering dynamic frequency constraint, for isolated power grid set comprising high-permeability photovoltaic power supply
  • Combination optimizing method, considering dynamic frequency constraint, for isolated power grid set comprising high-permeability photovoltaic power supply
  • Combination optimizing method, considering dynamic frequency constraint, for isolated power grid set comprising high-permeability photovoltaic power supply

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Embodiment

[0040] The method proposed in this patent has been verified under multiple example models. Due to space limitations, this embodiment analyzes and verifies the feasibility and effectiveness of the method proposed in this paper by taking the example of an improved ten-machine system as an example. Details are as follows:

[0041] Two photovoltaic power plants are connected to the system. The rated capacity of No. 1 photovoltaic power source is 500MW, and the rated capacity of No. 2 photovoltaic power source is 300MW. The sunshine conditions of the two photovoltaic power sources are the same. According to the actual situation of photovoltaic power output, the present invention considers that the photovoltaic output period is 10:00-15:00, wherein the photovoltaic penetration rate of each period is 19.2%-40%, and photovoltaic penetration rate=predicted value of photovoltaic power supply / predicted value of load.

[0042] This paper designs three schemes to verify the effectiveness a...

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Abstract

The invention relates to a combination optimizing method, considering dynamic frequency constraint, for an isolated power grid set comprising a high-permeability photovoltaic power supply. Dynamic frequency characteristic constraint is taken into consideration in a set combination optimizing model, and the load of a photovoltaic power supply is reduced and the frequency modulation capability of a system is enhanced if the photovoltaic power supply participates in frequency modulation. The method is based on an expression of the lowest point of dynamic frequency after an isolated power grid containing frequency modulation of the photovoltaic power supply, and the invention discloses an expression about the lowest point of dynamic frequency when the smallest frequency modulation capacity is needed by frequency modulation participation of the photovoltaic power supply to determine that the set combination model has the sufficient but not excessive photovoltaic power frequency modulation capacity during optimization. Moreover, the set combination optimizing model that contains the lowest point of dynamic frequency and the photovoltaic power frequency modulation capacity constraint is established. The invention brings forward the method for optimizing the inner layer and the outer layer of the optimizing model on the basis of decomposition to generate optimizing segments and through Benders decomposition. The problem-solving complexity is effectively reduced.

Description

technical field [0001] The invention relates to the field of operation, analysis and dispatching of electric power systems, in particular to an optimization method for unit combination of an isolated power grid containing high-permeability photovoltaic power sources considering dynamic frequency constraints. Background technique [0002] It has become a trend to form a grid structure for DC isolated grid power transmission by connecting DC converter stations. In the interconnection system, the inertial response and primary frequency modulation of each zone support each other, and the system has a strong frequency adjustment capability. However, the number of units in the isolated power grid is small, the inertia coefficient is small, and the primary frequency modulation response capability is limited. Since the photovoltaic power station has no rotating parts and the isolation of the photovoltaic grid-connected inverter, the photovoltaic power station has no inertia and pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/06
CPCY02E40/70Y04S10/50
Inventor 林涛叶婧陈汝斯徐遐龄洪雯毕如玉
Owner WUHAN UNIV
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