A coordinated expansion planning method for source, grid and load considering the optimization of DC transmission from hydropower, wind and solar power plants

By establishing a coordinated expansion planning method for water, wind and light combined with DC transmission, the problem of poor controllability of wind and light renewable energy is solved, the system's long-term cost reduction and efficient utilization of resources are achieved, and the planning and operation of the power system are optimized.

CN115622121BActive Publication Date: 2025-08-15GUO JIA DIAN WANG YOU XIAN GONG SI XI NAN FEN BU
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Patent Information

Application Number
CN202211256060.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-13
Publication Date
2025-08-15
Estimated Expiration
2042-10-13

AI Technical Summary

Technical Problem

In the prior art, the controllability of renewable energy such as wind and light is poor, which leads to challenges in the safe and economic operation of the power grid. It has failed to fully utilize the complementary advantages of cascade hydropower stations and load-side demand responses, and lacks the coordinated optimization of medium- and long-term planning and DC transmission.

Method used

Establish a coordinated expansion planning method for source network-load considerations for water, wind, light and DC transmission. By establishing equipment investment and system operation models, combining load-side demand response services, an objective function is constructed to minimize the total system cost, and the sample average approximation method is used to deal with the uncertainty of wind, light output, and transform it into a mixed integer linear planning problem for solving.

Benefits of technology

It has achieved effective absorption of water, wind and light resources, reduced the medium- and long-term planning costs of the system, improved the calculation speed, fully utilized the advantages of load-side demand response, formed the complementary advantages of source and load resources, and optimized the resource utilization of the power system.

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Abstract

The present invention relates to a source-grid-load coordinated expansion planning method considering the optimization of combined hydropower, wind-solar and direct current transmission, belonging to the technical field of integrated energy system planning and operation. The method carries out detailed modeling of cascade hydropower stations and demand response, and takes into account the operational constraints of direct current transmission. The method utilizes demand response resources to alleviate the intermittent output of wind and solar power stations on the power supply side, proposes a load-side demand response service planning model to reduce the system's long-term planning costs, and establishes a source-grid-load coordinated planning model. The method establishes an opportunity constraint model to ensure the system's operational safety and the effective absorption of wind and solar power output, and utilizes the strong extension formula of the sample average approximation method to transform the opportunity constraint model into a mixed integer linear programming problem for solution.
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