Hybrid AC/DC power distribution network coordination optimization method

Abstract

The invention relates to a hybrid AC / DC power distribution network coordination optimization method based on two-stage stochastic programming. A hybrid AC / DC power distribution network two-stage stochastic programming scheduling model considering wind power output uncertainty is established. The method comprises: firstly, establishing power flow models of an alternating current network, a direct current network and a voltage source type converter in a hybrid power distribution network; secondly, constructing a simplified scene set for describing the uncertainty characteristic of the real-timeoutput of the wind power by combining a scene generation and reduction technology; and finally, establishing a hybrid AC / DC power distribution network optimization model based on two-stage stochasticprogramming, and converting the nonlinear optimization problem into a mixed integer second-order cone programming problem for solving. The method can be applied to making a scheduling decision of thehybrid AC / DC power distribution network comprising a wind turbine generator, a converter station and an energy storage device, and is beneficial to improving the effectiveness of a scheduling scheme in an uncertain operation environment.

Description

technical field [0001] The invention relates to the technical field of coordination and optimization of a hybrid AC-DC distribution network, and more specifically relates to a method for coordination and optimization of a hybrid AC-DC distribution network. Background technique [0002] At present, for the problems of increased operating loss and reduced operational reliability of distribution network caused by the uncertainty of distributed power output, it is necessary to study the coordination optimization method of hybrid distribution network that integrates multiple active control measures under uncertain operating conditions. The effectiveness of the system decision-making is questioned when the distribution network dispatching plan is formulated only considering the day-ahead forecast value of distributed power output. In addition, as a new trend in the development of smart distribution networks in the future, different types of reactive power and voltage in the hybrid ...

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Problems solved by technology

[0002] At present, for the problems of increased operating loss and reduced operational reliability of the distribution network caused by the uncertainty of distributed power output, it is necessary to study the coordination optimization method of hybrid distribution network that integrates multiple active control measures under uncertain operating conditions.

The effectiveness of the system decision-making is questioned when only considering the forecasted value of distributed power output to make the distribution network dispatching plan. In addition, as a new trend in the development of smart distribution network in the future, different types of reactive power and voltage in the hybrid AC-DC distribution network The effective coordination and control of equipment, AC / DC converter stations and energy storage systems needs to be further explored to promote renewable energy consumption and flexible and reliable power supply in distribution networks.

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