Calculation method of minimum new reactive power compensation capacity of power grid based on layered optimization

Abstract

The invention relates to a method for calculating the minimum newly-increased reactive power compensation capacity of the power grid based on layered optimization. The method is based on the predicted value of the power grid load, and takes the minimum newly-added reactive power compensation capacity of the power grid as the objective function, and simultaneously considers "power system voltage and reactive power" The minimum capacity of reactive power compensation of capacitors and reactors exceeds the limit in the Technical Guidelines for Power and Power, as well as the upper and lower limits of substation bus voltage, line active power flow and other constraints under the three operating modes of maximum load, minimum load and normal load, etc., through hierarchical optimization The idea decomposes the entire model into an upper-level model that can be directly solved by a linear programming algorithm and a lower-level optimization model composed of nonlinear constraints. Through continuous optimization between the two-level models, the final optimization result meets the relevant technical guidelines and is in the It meets the voltage operation requirements of the power system under various load levels.

Description

technical field [0001] The invention belongs to the field of optimized configuration of reactive power compensation devices of a power grid, and relates to a method for calculating the minimum newly added reactive power compensation capacity of a power grid based on a layered optimization idea. Background technique [0002] The local and nearby balance of reactive power can ensure good voltage quality, but the lack and excess of reactive power are not conducive to maintaining voltage quality and safe operation of the power grid. [0003] For a long time, people's attention to voltage problems has generally focused on low voltage, large network loss and possible voltage collapse accidents caused by lack of reactive power. However, with the rapid development of the power grid, its characteristics have also changed accordingly, mainly reflected in the continuous strengthening of the upper main grid, the extensive use of cable lines in the urban power grid, and the large number ...

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Problems solved by technology

Some scholars also use the reactive power optimization algorithm based on the catastrophic genetic algorithm to perform reactive power optimization calculations on the lowest load valley flow section of the regional power grid under the small operation mode, and obtain a specific compensation plan including compensation points and compensation capacities at each point, but does not consider capacitors. Compensation capacity optimization for

In addition, on the basis of the principle of in-situ reactive power balance and layered balance, the researchers proposed an algorithm based on the concept of economic pressure difference, by analyzing the inherent relationship between active power loss caused by reactive power transmission, node voltage, and reactive power compensation Contact to optimize the reasonable configuration of reactive power compensation devices, but only applicable to the configuration of dynamic reactive power compensation devices

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