Interconnected power grid economical scheduling method taking power grid structure adjustment into consideration

Abstract

An interconnected power grid economical scheduling method taking power grid structure adjustment into consideration is provided. The method includes the following steps: 1) dividing power grids; 2) calculating initialization for one power grid in a subarea, giving decision variable initial values, giving voltage phase angle top and bottom limitation values, setting the greatest number of power transmission branches allowable to be on and off, and constructing an optimization model; 3) the power grids of the subareas concurrently carrying out economical scheduling that takes power grid structure adjustment into consideration; 4) a coordination center unit conducting global optimization for global variables as decision contents on the basis of local variables calculated by the power grids of the subareas, updating linking-up road power and boundary node phase angles; 5) according to local variable values decided in the step 3) and global variable values decided in the step 4), concurrently updating local dual variables of the power grids of the subareas; 6) determining whether conditions of convergence are satisfied; 7) determining whether the maximum number of times of iteration is reached; and 8) providing an optimal interconnected power grid scheduling scheme.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to an economic dispatching method of an interconnected power grid considering the structural adjustment of the power grid. Background technique [0002] The generation and consumption of electricity are different in time domain and region, and at the same time considering the complementarity of resources, safety and reliability, the interconnected grid was born. The economic dispatch of multi-regional interconnected power grids can achieve economies of scale and complementary cooperation with support capabilities such as frequency and voltage, and achieve a wider range of optimal allocation of resources. For a long time, in the economic dispatching of power system, the decision-making problem of power generation and load balance has been studied under the condition that the grid structure remains unchanged. Similar to the transportation network and computer network, there is...

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Problems solved by technology

The economic dispatch of the interconnected grid mentioned in the above patents is an economic decision-making of power generation tracking load under the condition that the grid structure of each region remains unchanged. In fact, the modern smart grid topology is flexible and controllable, and has a certain optimization space. Neglecting this feature will inevitably lead to conservatism in dispatching decisions, which is not conducive to maximizing the economic benefits of the interconnected grid. If the traditional dispatching decision-making method under the fixed grid structure is still used, it is inevitable that there is no dispatching feasible solution

The Chinese patent with the patent application number of 201510213805.9: "A Power System Economic Dispatching Method Considering Power Grid Topology Optimization" provides a power system economic dispatch method considering power grid topology optimization. The joint decision-making of the operating status is conducive to excavating the potential factors to improve the economic benefits of dispatching, but it is realized in the isolated grid and does not involve the interconnected grid

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