A method and system for multi-stage joint expansion planning of power generation and transmission

Abstract

The invention discloses a power generation and transmission multi-stage joint expansion planning method and system. The method comprises the following steps: reducing operation data with space-time characteristics by using a fuzzy clustering method to serve as a planned operation scene in a research period, and establishing a multi-objective and multi-stage power generation and transmission jointexpansion planning model for optimization by taking the full life cycle cost and cascading failure risk as economy and reliability targets and taking each horizontal year within a research year as a planning stage. According to the method, the economy and the operation reliability of the system are coordinated within the whole research period, a progressive expansion planning mode that a network source structure is matched with a load demand is formed, and a Pareto optimal solution set and a recommended staged expansion planning sequence can be obtained through optimization.

Description

technical field [0001] The invention belongs to the field of electric power system planning, and in particular relates to a multi-stage joint expansion planning method and system for power generation and transmission. Background technique [0002] In recent years, with the rapid development of the economy, the demand for electricity is large and showing a continuous growth trend. As of 2018, the peak load of Shandong provincial power grid has exceeded 77 million kilowatts. Electricity demand cannot be reliably guaranteed. In addition, as the penetration rate of renewable energy power generation continues to increase and large-scale DC transmission systems are put into operation one after another, the AC system needs to have a reasonable grid structure that matches the load demand and sufficient system strength to ensure renewable energy. Consumption and stable operation of the DC system, avoiding large-scale cascading failures caused by weak systems and resulting in major b...

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Problems solved by technology

[0004] a. Optimizing with the investment in the early and short term of planning as the economic goal, ignoring the continuous changes in the operating scenarios in the medium and long term, which may result in the sacrifice of reliability, which will greatly increase the long-term operation of the system and the cost of failure;

[0005] b. Single-stage planning during the research period, the expansion behavior is limited to the initial planning point, and unified and coordinated planning cannot be carried out throughout the research period, which greatly increases the total cost;

[0006] c. Independent planning of network and source is not conducive to the coordinated development of network and source, and cannot guarantee the economy and reliability of the system as a whole

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