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A method and system for evaluating new energy external transmission capacity connected to a flexible DC power grid

A flexible DC and new energy technology, applied in AC network circuits, wind power generation, electrical components, etc., can solve the problem of lack of analysis and calculation methods for the maximum delivery limit of new energy

Active Publication Date: 2021-12-03
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is a lack of relevant analysis and calculation methods for the maximum transmission limit of new energy sources such as wind power, photovoltaics, pumped storage power generation, etc.
Moreover, the existing technology lacks research on the power supply capacity of wind power photovoltaic new energy and pumped storage combined operation system

Method used

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  • A method and system for evaluating new energy external transmission capacity connected to a flexible DC power grid
  • A method and system for evaluating new energy external transmission capacity connected to a flexible DC power grid
  • A method and system for evaluating new energy external transmission capacity connected to a flexible DC power grid

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Embodiment

[0170] For the wind-solar-pump combined operation system, if only the cross-section transmission power limit at one time point is calculated, it is only necessary to make the pumped storage power station generate as much power as possible (or pump as little water) as possible under various safety constraints. This cannot reflect the role of pumping and storage in the concept of time to eliminate peaks and fill valleys, nor can it fully reflect the working characteristics of pumping and storage and its requirements for storage capacity. For the two-area interconnection system, the maximum transmission power on the section between the power supply and power receiving areas should be equal to the smaller value of the maximum power supply in the power supply area and the maximum power consumption in the power receiving area. That is, formula (1):

[0171] P TTC =min(P Smax ,P Rmax ) (1)

[0172] In the formula: P Smax is the delivery limit of the power supply area, P Rmax It...

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Abstract

The present invention provides a method and system for evaluating new energy external transmission capacity connected to a flexible DC power grid, which divides the pre-established AC-DC hybrid system into a power supply area and a power receiving area; uses the interior point method to solve the wind-solar-pump joint operation optimization model , to obtain the maximum output power of the power supply area; wherein, the wind-solar-pump joint operation optimization model includes constraints and objective functions of the power supply area defined based on the absorptive limit of the power receiving area.

Description

technical field [0001] The invention belongs to the field of electric power system automation, and in particular relates to a method and system for evaluating new energy external transmission capabilities connected to a flexible DC power grid. Background technique [0002] With the adjustment of energy structure, the development scale of new energy is gradually increasing. The application of new energy is increasingly widespread around the world. By the end of 2016, China's wind power and solar grid-connected installed capacity reached 147 million kilowatts and 78 million kilowatts, respectively. However, traditional technology faces many practical problems when new energy is connected to the power system on a large scale. Therefore, the flexible DC transmission technology with fast and flexible controllability, high compactness and excellent environmental adaptability has been widely used in the integration of new energy sources. The fluctuation and intermittency of wind ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00H02J3/46
CPCH02J5/00H02J3/472Y02E10/76
Inventor 杨晓楠赵昆郎燕生张印刘鹏王磊罗雅迪王淼宋旭日李理李静黄金魁
Owner CHINA ELECTRIC POWER RES INST