Second-order cone programming method for power-off grid load recovery with consideration of recovery quantity uncertainty

A second-order cone planning and load recovery technology, applied in the power grid field, can solve the problems of difficulty in obtaining the probability density function, lack of measured data, and great influence of the load recovery scheme, achieving good accuracy and robustness, high solution efficiency, The effect of ensuring safety

Active Publication Date: 2017-09-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0003] Aiming at the uncertainty of load restoration, some scholars propose based on fuzzy model processing. However, the selection of fuzzy parameters has a great influence on the load restoration scheme, and it is difficult to obtain accurate fuzzy parameters.
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  • Second-order cone programming method for power-off grid load recovery with consideration of recovery quantity uncertainty
  • Second-order cone programming method for power-off grid load recovery with consideration of recovery quantity uncertainty
  • Second-order cone programming method for power-off grid load recovery with consideration of recovery quantity uncertainty

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Embodiment 1

[0165] Taking the IEEE10-machine 39-node system as an example, the power grid topology is as follows: figure 2 As shown, unit 30 is a hydroelectric unit with self-starting capability, and the rest are thermal power units without self-starting capability. Assume that at the current time step, apart from the self-starting units, units 37, 38, 39, and 33 have recovered, figure 2 The bold solid line in the center is the restored path. The small system that has been restored provides utility power for unit 34, and its recovery path is: 19-20-34, such as figure 2 Shown by the dotted line.

[0166] (1) Accuracy analysis of load restoration second-order cone programming model based on information gap decision theory

[0167] In order to verify the accuracy of the improved model and solution method of the present invention, the power flow results obtained by solving the model of the present invention are compared with the calculation results of the power flow program in the BPA p...

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Abstract

The invention discloses a second-order cone programming method for power-off grid load recovery with consideration of recovery quantity uncertainty. On the basis of improvement of a load recovery robustness optimization model with consideration of uncertainty, a robust model with a mixed integer second-order cone mode is established and solving is carried out to obtain a load recovery robust plan. The method comprises: 1, establishing a power-off grid load recovery certainty model; 2, on the basis of an information gap decision-making theory, establishing a robustness optimization model with consideration of load recovery uncertainty; 3, with a second-order cone relaxation method, carrying out convex optimization relaxation processing on a non-linear power flow equation in the optimization model; 4, carrying out linear processing on the rest of nonlinear constraints; and 5, on the basis of a direct-current power flow model, invoking CPLEX at two stages to solve the optimization model, thereby obtaining a load recovery plane. With the method disclosed by the invention, a load recovery plan can be obtained rapidly and accurately; load fluctuation within a certain range can be carried; and security of the grid recovery process can be guaranteed. The method has the certain theoretical value and engineering value.

Description

technical field [0001] The invention belongs to the technical field of power grids, in particular to a second-order cone planning method for power grid load restoration in consideration of uncertain restoration quantities. Background technique [0002] Load restoration is an important task in the restoration process of power grid after power failure. It is not only the purpose of power grid restoration but also an important means to ensure the stability of the restoration process. Scholars at home and abroad have carried out a lot of research work on load restoration optimization. However, in most studies, the amount of load restoration is assumed to be a definite value, that is, the estimated restored load is equal to the actual restored load. However, in the actual power grid restoration, the uncertainty of the load is inevitable. Uncertain load recovery schemes considering load may affect the safety of the recovery process when implemented. For this reason, it is necessa...

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Application Information

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IPC IPC(8): H02J3/00H02J3/06
CPCH02J3/00H02J3/06H02J2203/20
Inventor 陈晞黄琳雁谢云云吕友杰蔡胜宋雯雯李凯嵘陈佳欣卜京殷明慧姚娟邹云蔡晨晓张俊芳
Owner NANJING UNIV OF SCI & TECH
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