Sorting-based distributed photovoltaic grid-connected inverter voltage control method and system

Abstract

The invention relates to a sorting-based distributed photovoltaic grid-connected inverter voltage control method and system, and belongs to the field of voltage regulation of a power distribution network under distributed photovoltaic grid connection. The voltage of a photovoltaic power generation access node is monitored, and when the voltage is monitored to exceed the boundary, the reactive power output value is adjusted through an inverter to adjust the voltage amplitude of an access point, when the reactive power is adjusted to the limit and still cannot meet the requirement, the active power of distributed power generation is adjusted to adjust the voltage amplitude of the access point, so that the voltage out-of-limit problem can be well solved, and the voltage stability under distributed photovoltaic access is improved; and nodes are selected for power regulation based on a sorting method, so that regulation objects of the power distribution network are reduced, and the voltage of the grid-connected point can be quickly recovered to an allowable range.

Description

technical field [0001] The invention relates to the field of distribution network voltage regulation under distributed photovoltaic grid connection, in particular to a sequencing-based inverter voltage control method and system under distributed photovoltaic grid connection. Background technique [0002] The proposal of "carbon peak" and "carbon neutrality" goals has brought a wide and profound systemic change to the power system, which means that renewable energy will become the future development trend. Among them, solar photovoltaic power generation is an important energy source for the grid. Photovoltaic power generation has the characteristics of volatility and uncertainty, especially for distribution networks connected to distributed photovoltaics. It changes the topology of traditional radial distribution networks, resulting in unstable grid voltage levels and complex harmonic characteristics. The problem has seriously affected the quality of power supply for users a...

AI Technical Summary

Problems solved by technology

A small amount of literature proposes to use on-load tap changer transformer taps to stabilize voltage fluctuations caused by photovoltaic power generation based on the influence of distributed generation capacity, location and other factors on voltage. However, some transformers in the actual grid do not have voltage regulation capabilities or can only No-load voltage regulation

In terms of grid-connected voltage control based on photovoltaic grid-connected inverters, current research is mainly focused on using the remaining capacity of grid-connected inverters to provide a certain amount of reactive power for the system to adjust voltage. The investment in reactive power compensation equipment, but the research on this method did not take into account the countermeasures when reactive power compensation is insufficient

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