Coordinated control method for multi-level reactive power and voltage in active distribution network

Abstract

The invention relates to a coordinated control method for multistage reactive voltage in an active distribution network. The control method comprises the steps of grading voltage regulation resources in the active distribution network, executing four stages of voltage regulation in sequence from low to high, judging whether the voltage level of the whole network is qualified after each stage of voltage regulation, and when the voltage level of the whole network is qualified, not performing next stage of voltage regulation, wherein the four stages of voltage regulation are respectively first, second, third and fourth ones of a power system realized by using a distributed photovoltaic power supply, reactive power output of a photovoltaic power station, a traditional VQC (Voltage Quality Control) device and active power output of the photovoltaic power station. Compared with the prior art, the control method sufficiently using the scattered voltage regulation resources in the active distribution network has the advantages of effectively reducing the actions of the VQC device, improving the voltage level of the distribution network and the like.

Description

technical field [0001] The present invention relates to the field of reactive power voltage control of distribution network, mainly relates to the local control strategy of reactive power voltage of distributed power supply in distribution network and the research on layered reactive voltage control of active distribution network, especially relates to an active distribution network Multi-level reactive power and voltage coordinated control method in grid. Background technique [0002] With the increase of power system load demand and increasingly serious environmental protection problems, the use of clean and renewable energy to realize distributed power generation has become the mainstream trend of power grid development. On the one hand, the access of distributed generation (Distribution Generation, DG) realizes the local balance of energy and reduces the loss caused by long-distance power transmission, but on the other hand, the massive access of DG changes the operation...

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Problems solved by technology

The applicability of this control strategy has been improved to a certain extent, but the control strategy does not consider the voltage information of the grid-connected point. When the photovoltaic output and load are large, the voltage does not exceed the limit. Adopting this control strategy may destroy the grid voltage level.

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