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Automatic adjustment method and device for load flow calculation convergence

A power flow calculation and power flow technology, applied in the field of power system, can solve the problems of high labor cost, inaccuracy, and low efficiency in adjusting the convergence of large power grids.

Active Publication Date: 2020-05-29
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] This application provides an automatic adjustment method for the convergence of power flow calculation, which solves the problems of low efficiency, inaccuracy and excessive labor cost in adjusting the convergence of large power grids

Method used

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  • Automatic adjustment method and device for load flow calculation convergence
  • Automatic adjustment method and device for load flow calculation convergence
  • Automatic adjustment method and device for load flow calculation convergence

Examples

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Comparison scheme
Effect test

Embodiment 1

[0061] In this embodiment, a small calculation example is used to verify first, and the method of the present invention is applied to the small calculation example to adjust the power flow by balancing the active power and reactive power, so that the non-convergent samples adjust the operation mode to calculate convergence. The test results have verified the effectiveness of the present invention.

[0062] Furthermore, in the small calculation example, in order to be close to the actual project, capacitors and reactors are added to the low-voltage bus of the CEPRI36 node system, so that the system can withstand larger power flows and more reactive power imbalances. Based on the initial convergence power flow of the system itself, the generator and load are randomly changed between 0 and 4 times, and the switching conditions of the capacitive reactor are changed at the same time to generate 9711 sets of data. According to the power flow calculation, among the 9711 sets of data,...

Embodiment 2

[0066] In the embodiment of this application, the verification is carried out in the Northeast Power Grid, and the method of the present invention is used to adjust the power flow by balancing the active power and reactive power, so that the non-convergent samples adjust the operation mode to calculate the convergence. The test results verify the effectiveness of the present invention in the actual system.

[0067] Further, for the test results, see Image 6 , compared with the 36-node system, the results of Northeast Power Grid under Scheme 1 are much worse than those of Scheme 1, mainly because in large power grids, the range of switching capacitors is wider, and it is not easy to effectively balance reactive power. Under scheme 2, when each episode includes 100 steps, 43% can converge within 10 steps, and 8% are difficult to converge within 100 steps. When each episode includes 200 steps, only 3% are difficult to converge, and the effect of adjusting the convergence is low...

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Abstract

The invention discloses an automatic adjustment method for load flow calculation convergence. The method comprises the steps of designing a state, an action space and a reward of a deep reinforcementlearning network for load flow calculation convergence; constructing a deep reinforcement learning network for load flow calculation convergence according to the state, the action space and the reward; knowledge experience is added into the deep reinforcement learning network, and the process of manually adjusting the power flow is simulated, so that a power flow adjustment strategy is constructed, the power flow convergence of the power grid is adjusted by using the power flow adjustment strategy, and the problems of low convergence working efficiency, inaccuracy and overlarge manpower cost consumption of the current adjustment of the large power grid are solved.

Description

technical field [0001] The present application relates to the technical field of electric power systems, in particular to an automatic adjustment method for power flow calculation convergence, and at the same time relates to an automatic adjustment device for power flow calculation convergence. Background technique [0002] The power flow convergence adjustment problem is the most basic work of power grid simulation analysis, which provides a basis for the design of power grid operation and planning. From a mathematical point of view, the essence of power flow calculation is to solve nonlinear equations. If the solution of the equation does not exist or falls into an ill-conditioned solution that makes the power flow equation difficult to converge, it is called non-convergent power flow. Currently, the non-convergence of the power flow is mainly adjusted manually. The adjustment process is complicated and depends on manual experience, and the efficiency is low. For large po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27
Inventor 汤涌王甜婧郭强黄彦浩陈兴雷文晶李文臣张松涛黄河凯王宏志
Owner CHINA ELECTRIC POWER RES INST
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