Limit solution method of transmission section based on reverse equivalent pair adjustment method

Abstract

The invention belongs to the technical field of electric power systems and automation thereof, and in particular relates to a method for solving the limit of a power transmission section based on a reverse equivalent matching adjustment method. It is characterized in that, firstly, in the normal operation mode, a typical load pattern is taken to form the original data of the ground state power flow; the operating branch with the largest active power is found, and the power flow is transferred to other branches after disconnecting the branch; The branch that is most likely to exceed the limit is found in the road; calculate the sensitivity of each unit in the sending and receiving end area to the branch that is most likely to exceed the limit, calculate the adjustment amount until the branch that is most likely to exceed the limit is overloaded, and reversely adjust to Branch le is not overloaded; calculate the sum of all branch flows at this time, which is the transmission limit of the section. The invention sorts all the controllable units according to the sensitivity, selects the units with the largest and smallest sensitivity for pairing when adjusting each pairing, does not rely on the balancing machine during adjustment, and the result is more reasonable and reliable.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof, and in particular relates to a method for solving the limit of a power transmission section based on a reverse equivalent matching adjustment method. Background technique [0002] The modern interconnected power grid is large in scale and complex in structure, and the strength of the connections between the networks varies. The transmission capacity of some lines is inevitably restricted by thermal or dynamic stability limits. In order to facilitate analysis, calculation and operation management, operators usually Divided into several subsystems and connection sections between systems. Accurately grasping the transmission limit of each contact section can satisfy the load demand of each sub-region to the greatest extent on the premise of ensuring the safe operation of the power system. [0003] The analysis and calculation of system transmission capacity has...

AI Technical Summary

Problems solved by technology

Deterministic methods mainly include direct solution method, repetitive power flow method, continuous power flow method, and optimal power flow method. Among them, the direct solution method directly increases the power between regions to overload the line, and then reduces the switching power in the research region by half. The algorithm is simple However, the accuracy is not high, and it is difficult to meet the needs of practical applications. Although the latter methods improve the accuracy, because the solution process includes equation parameterization, nonlinear equation processing, and the calculation process requires iteration, etc., the calculation speed is too slow to be applied. The probabilistic methods mainly include stochastic programming method, enumeration method and Monte Carlo simulation method. Although these methods effectively take into account various uncertain factors, they cannot adapt to the Calculations for Large Power Grids

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