Active power distribution network voltage control method and system based on distributed power supply

Abstract

The invention relates to the field of active power distribution network voltage control and particularly discloses an active power distribution network voltage control method and system based on a distributed power supply. The method includes that an upper layer realizes the active power distribution network global voltage control by taking long-time scale economic operation of the active power distribution network as the principle by means of a power distribution network dynamic reconstruction method; the lower layer realizes the active power distribution network local voltage control by taking a feedback automatic voltage regulator and a capacitor as the controlled objects and taking the branch voltage level as the optimization object; and the voltage active control double-layer models coordinate with each other to make a more comprehensive voltage optimization strategy so that the voltage active control of the active power distribution network can be realized. Meanwhile, based on the voltage active control double-layer models, the trend constraint of the upper layer global voltage regulating model is relaxed by means of a second-order cone, the voltage active control double-layer models can be equivalently converted to a single-layer decision model by means of the kuhn-tucker condition, therefore, the model solution complexity is simplified on the basis of guaranteeing the active power distribution network voltage regulating performance, and the algorithm efficiency is improved.

Description

technical field [0001] The invention relates to the field of active distribution network voltage management and control, in particular to a method and system for active distribution network voltage management and control based on distributed power sources. Background technique [0002] At present, in the aspect of active distribution network voltage control technology, most of the global voltage optimization control methods are used, and the voltage control method and strategy of active distribution network are carried out starting from the objective function, control variable, voltage regulation method, SVR and capacitor and other factors. There are a lot of beneficial discussions; however, the global voltage optimization control inevitably has the following problems with the rapid increase of clean energy penetration rate. First, the global voltage control strategy is difficult to guarantee the local branch voltage level; second, the control strategy is difficult Fully con...

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Problems solved by technology

[0002] At present, in the aspect of active distribution network voltage control technology, most of the global voltage optimization control methods are used, and the voltage control method and strategy of active distribution network are carried out starting from the objective function, control variable, voltage regulation method, SVR and capacitor and other factors. There are a lot of beneficial discussions; however, the global voltage optimization control inevitably has the following problems with the rapid increase of clean energy penetration rate. First, the global voltage control strategy is difficult to guarantee the local branch voltage level; second, the control strategy is difficult Fully considering the impact of the timing fluctuation of decentralized clean energy on the voltage of the active distribution network, the active control of the system voltage is lost; the third is that there are many types of voltage regulation methods, SVRs and capacitors in the active distribution network, each with its own advantages and disadvantages ; Therefore, some scholars proposed to use the active voltage control double-layer model to solve the problem of active distribution network voltage control under the access of high penetration clean energy, but when establishing the active voltage control double-layer model, some use a single distribution network reconstruction voltage The active control double-layer model does not consider the coordination of SVR and capacitors in the active distribution network; some methods propose a layered and staged voltage control framework for the active distribution network for a single SVR and capacitor, without fully considering different voltage regulation devices For the active distribution network with high penetration of clean energy access, it is difficult to fully tap the voltage control capability of the active distribution network by using the flexibility of the distribution network network or SVR and capacitors

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